src/pdf/pdfium/pdfium_engine.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "pdf/pdfium/pdfium_engine.h"
   6
   7 #include <math.h>
   8
   9 #include "base/json/json_writer.h"
  10 #include "base/logging.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/stl_util.h"
  13 #include "base/strings/string_number_conversions.h"
  14 #include "base/strings/string_piece.h"
  15 #include "base/strings/string_util.h"
  16 #include "base/strings/utf_string_conversions.h"
  17 #include "base/values.h"
  18 #include "pdf/draw_utils.h"
  19 #include "pdf/pdfium/pdfium_mem_buffer_file_read.h"
  20 #include "pdf/pdfium/pdfium_mem_buffer_file_write.h"
  21 #include "ppapi/c/pp_errors.h"
  22 #include "ppapi/c/pp_input_event.h"
  23 #include "ppapi/c/ppb_core.h"
  24 #include "ppapi/c/private/ppb_pdf.h"
  25 #include "ppapi/cpp/dev/memory_dev.h"
  26 #include "ppapi/cpp/input_event.h"
  27 #include "ppapi/cpp/instance.h"
  28 #include "ppapi/cpp/module.h"
  29 #include "ppapi/cpp/private/pdf.h"
  30 #include "ppapi/cpp/trusted/browser_font_trusted.h"
  31 #include "ppapi/cpp/url_response_info.h"
  32 #include "ppapi/cpp/var.h"
  33 #include "third_party/pdfium/fpdfsdk/include/fpdf_ext.h"
  34 #include "third_party/pdfium/fpdfsdk/include/fpdf_flatten.h"
  35 #include "third_party/pdfium/fpdfsdk/include/fpdf_searchex.h"
  36 #include "third_party/pdfium/fpdfsdk/include/fpdf_sysfontinfo.h"
  37 #include "third_party/pdfium/fpdfsdk/include/fpdf_transformpage.h"
  38 #include "third_party/pdfium/fpdfsdk/include/fpdfedit.h"
  39 #include "third_party/pdfium/fpdfsdk/include/fpdfoom.h"
  40 #include "third_party/pdfium/fpdfsdk/include/fpdfppo.h"
  41 #include "third_party/pdfium/fpdfsdk/include/fpdfsave.h"
  42 #include "third_party/pdfium/fpdfsdk/include/pdfwindow/PDFWindow.h"
  43 #include "third_party/pdfium/fpdfsdk/include/pdfwindow/PWL_FontMap.h"
  44 #include "ui/events/keycodes/keyboard_codes.h"
  45
  46 namespace chrome_pdf {
  47
  48 namespace {
  49
  50 #define kPageShadowTop    3
  51 #define kPageShadowBottom 7
  52 #define kPageShadowLeft   5
  53 #define kPageShadowRight  5
  54
  55 #define kPageSeparatorThickness 4
  56 #define kHighlightColorR 153
  57 #define kHighlightColorG 193
  58 #define kHighlightColorB 218
  59
  60 const uint32 kPendingPageColor = 0xFFEEEEEE;
  61
  62 #define kFormHighlightColor 0xFFE4DD
  63 #define kFormHighlightAlpha 100
  64
  65 #define kMaxPasswordTries 3
  66
  67 // See Table 3.20 in
  68 // http://www.adobe.com/devnet/acrobat/pdfs/pdf_reference_1-7.pdf
  69 #define kPDFPermissionPrintLowQualityMask  1 << 2
  70 #define kPDFPermissionPrintHighQualityMask 1 << 11
  71 #define kPDFPermissionCopyMask             1 << 4
  72 #define kPDFPermissionCopyAccessibleMask   1 << 9
  73
  74 #define kLoadingTextVerticalOffset 50
  75
  76 // The maximum amount of time we'll spend doing a paint before we give back
  77 // control of the thread.
  78 #define kMaxProgressivePaintTimeMs 50
  79
  80 // The maximum amount of time we'll spend doing the first paint. This is less
  81 // than the above to keep things smooth if the user is scrolling quickly. We
  82 // try painting a little because with accelerated compositing, we get flushes
  83 // only every 16 ms. If we were to wait until the next flush to paint the rest
  84 // of the pdf, we would never get to draw the pdf and would only draw the
  85 // scrollbars. This value is picked to give enough time for gpu related code to
  86 // do its thing and still fit within the timelimit for 60Hz. For the
  87 // non-composited case, this doesn't make things worse since we're still
  88 // painting the scrollbars > 60 Hz.
  89 #define kMaxInitialProgressivePaintTimeMs 10
  90
  91 // Copied from printing/units.cc because we don't want to depend on printing
  92 // since it brings in libpng which causes duplicate symbols with PDFium.
  93 const int kPointsPerInch = 72;
  94 const int kPixelsPerInch = 96;
  95
  96 struct ClipBox {
  97   float left;
  98   float right;
  99   float top;
 100   float bottom;
 101 };
 102
 103 int ConvertUnit(int value, int old_unit, int new_unit) {
 104   // With integer arithmetic, to divide a value with correct rounding, you need
 105   // to add half of the divisor value to the dividend value. You need to do the
 106   // reverse with negative number.
 107   if (value >= 0) {
 108     return ((value * new_unit) + (old_unit / 2)) / old_unit;
 109   } else {
 110     return ((value * new_unit) - (old_unit / 2)) / old_unit;
 111   }
 112 }
 113
 114 std::vector<uint32_t> GetPageNumbersFromPrintPageNumberRange(
 115     const PP_PrintPageNumberRange_Dev* page_ranges,
 116     uint32_t page_range_count) {
 117   std::vector<uint32_t> page_numbers;
 118   for (uint32_t index = 0; index < page_range_count; ++index) {
 119     for (uint32_t page_number = page_ranges[index].first_page_number;
 120          page_number <= page_ranges[index].last_page_number; ++page_number) {
 121       page_numbers.push_back(page_number);
 122     }
 123   }
 124   return page_numbers;
 125 }
 126
 127 #if defined(OS_LINUX)
 128
 129 PP_Instance g_last_instance_id;
 130
 131 struct PDFFontSubstitution {
 132   const char* pdf_name;
 133   const char* face;
 134   bool bold;
 135   bool italic;
 136 };
 137
 138 PP_BrowserFont_Trusted_Weight WeightToBrowserFontTrustedWeight(int weight) {
 139   COMPILE_ASSERT(PP_BROWSERFONT_TRUSTED_WEIGHT_100 == 0,
 140                  PP_BrowserFont_Trusted_Weight_Min);
 141   COMPILE_ASSERT(PP_BROWSERFONT_TRUSTED_WEIGHT_900 == 8,
 142                  PP_BrowserFont_Trusted_Weight_Max);
 143   const int kMinimumWeight = 100;
 144   const int kMaximumWeight = 900;
 145   int normalized_weight =
 146       std::min(std::max(weight, kMinimumWeight), kMaximumWeight);
 147   normalized_weight = (normalized_weight / 100) - 1;
 148   return static_cast<PP_BrowserFont_Trusted_Weight>(normalized_weight);
 149 }
 150
 151 // This list is for CPWL_FontMap::GetDefaultFontByCharset().
 152 // We pretend to have these font natively and let the browser (or underlying
 153 // fontconfig) to pick the proper font on the system.
 154 void EnumFonts(struct _FPDF_SYSFONTINFO* sysfontinfo, void* mapper) {
 155   FPDF_AddInstalledFont(mapper, "Arial", FXFONT_DEFAULT_CHARSET);
 156
 157   int i = 0;
 158   while (CPWL_FontMap::defaultTTFMap[i].charset != -1) {
 159     FPDF_AddInstalledFont(mapper,
 160                           CPWL_FontMap::defaultTTFMap[i].fontname,
 161                           CPWL_FontMap::defaultTTFMap[i].charset);
 162     ++i;
 163   }
 164 }
 165
 166 const PDFFontSubstitution PDFFontSubstitutions[] = {
 167     {"Courier", "Courier New", false, false},
 168     {"Courier-Bold", "Courier New", true, false},
 169     {"Courier-BoldOblique", "Courier New", true, true},
 170     {"Courier-Oblique", "Courier New", false, true},
 171     {"Helvetica", "Arial", false, false},
 172     {"Helvetica-Bold", "Arial", true, false},
 173     {"Helvetica-BoldOblique", "Arial", true, true},
 174     {"Helvetica-Oblique", "Arial", false, true},
 175     {"Times-Roman", "Times New Roman", false, false},
 176     {"Times-Bold", "Times New Roman", true, false},
 177     {"Times-BoldItalic", "Times New Roman", true, true},
 178     {"Times-Italic", "Times New Roman", false, true},
 179
 180     // MS P?(Mincho|Gothic) are the most notable fonts in Japanese PDF files
 181     // without embedding the glyphs. Sometimes the font names are encoded
 182     // in Japanese Windows's locale (CP932/Shift_JIS) without space.
 183     // Most Linux systems don't have the exact font, but for outsourcing
 184     // fontconfig to find substitutable font in the system, we pass ASCII
 185     // font names to it.
 186     {"MS-PGothic", "MS PGothic", false, false},
 187     {"MS-Gothic", "MS Gothic", false, false},
 188     {"MS-PMincho", "MS PMincho", false, false},
 189     {"MS-Mincho", "MS Mincho", false, false},
 190     // MS PGothic in Shift_JIS encoding.
 191     {"\x82\x6C\x82\x72\x82\x6F\x83\x53\x83\x56\x83\x62\x83\x4E",
 192      "MS PGothic", false, false},
 193     // MS Gothic in Shift_JIS encoding.
 194     {"\x82\x6C\x82\x72\x83\x53\x83\x56\x83\x62\x83\x4E",
 195      "MS Gothic", false, false},
 196     // MS PMincho in Shift_JIS encoding.
 197     {"\x82\x6C\x82\x72\x82\x6F\x96\xBE\x92\xA9",
 198      "MS PMincho", false, false},
 199     // MS Mincho in Shift_JIS encoding.
 200     {"\x82\x6C\x82\x72\x96\xBE\x92\xA9",
 201      "MS Mincho", false, false},
 202 };
 203
 204 void* MapFont(struct _FPDF_SYSFONTINFO*, int weight, int italic,
 205               int charset, int pitch_family, const char* face, int* exact) {
 206   // Do not attempt to map fonts if pepper is not initialized (for privet local
 207   // printing).
 208   // TODO(noamsml): Real font substitution (http://crbug.com/391978)
 209   if (!pp::Module::Get())
 210     return NULL;
 211
 212   pp::BrowserFontDescription description;
 213
 214   // Pretend the system does not have the Symbol font to force a fallback to
 215   // the built in Symbol font in CFX_FontMapper::FindSubstFont().
 216   if (strcmp(face, "Symbol") == 0)
 217     return NULL;
 218
 219   if (pitch_family & FXFONT_FF_FIXEDPITCH) {
 220     description.set_family(PP_BROWSERFONT_TRUSTED_FAMILY_MONOSPACE);
 221   } else if (pitch_family & FXFONT_FF_ROMAN) {
 222     description.set_family(PP_BROWSERFONT_TRUSTED_FAMILY_SERIF);
 223   }
 224
 225   // Map from the standard PDF fonts to TrueType font names.
 226   size_t i;
 227   for (i = 0; i < arraysize(PDFFontSubstitutions); ++i) {
 228     if (strcmp(face, PDFFontSubstitutions[i].pdf_name) == 0) {
 229       description.set_face(PDFFontSubstitutions[i].face);
 230       if (PDFFontSubstitutions[i].bold)
 231         description.set_weight(PP_BROWSERFONT_TRUSTED_WEIGHT_BOLD);
 232       if (PDFFontSubstitutions[i].italic)
 233         description.set_italic(true);
 234       break;
 235     }
 236   }
 237
 238   if (i == arraysize(PDFFontSubstitutions)) {
 239     // TODO(kochi): Pass the face in UTF-8. If face is not encoded in UTF-8,
 240     // convert to UTF-8 before passing.
 241     description.set_face(face);
 242
 243     description.set_weight(WeightToBrowserFontTrustedWeight(weight));
 244     description.set_italic(italic > 0);
 245   }
 246
 247   if (!pp::PDF::IsAvailable()) {
 248     NOTREACHED();
 249     return NULL;
 250   }
 251
 252   PP_Resource font_resource = pp::PDF::GetFontFileWithFallback(
 253       pp::InstanceHandle(g_last_instance_id),
 254       &description.pp_font_description(),
 255       static_cast<PP_PrivateFontCharset>(charset));
 256   long res_id = font_resource;
 257   return reinterpret_cast<void*>(res_id);
 258 }
 259
 260 unsigned long GetFontData(struct _FPDF_SYSFONTINFO*, void* font_id,
 261                           unsigned int table, unsigned char* buffer,
 262                           unsigned long buf_size) {
 263   if (!pp::PDF::IsAvailable()) {
 264     NOTREACHED();
 265     return 0;
 266   }
 267
 268   uint32_t size = buf_size;
 269   long res_id = reinterpret_cast<long>(font_id);
 270   if (!pp::PDF::GetFontTableForPrivateFontFile(res_id, table, buffer, &size))
 271     return 0;
 272   return size;
 273 }
 274
 275 void DeleteFont(struct _FPDF_SYSFONTINFO*, void* font_id) {
 276   long res_id = reinterpret_cast<long>(font_id);
 277   pp::Module::Get()->core()->ReleaseResource(res_id);
 278 }
 279
 280 FPDF_SYSFONTINFO g_font_info = {
 281   1,
 282   0,
 283   EnumFonts,
 284   MapFont,
 285   0,
 286   GetFontData,
 287   0,
 288   0,
 289   DeleteFont
 290 };
 291 #endif  // defined(OS_LINUX)
 292
 293 void OOM_Handler(_OOM_INFO*) {
 294   // Kill the process.  This is important for security, since the code doesn't
 295   // NULL-check many memory allocations.  If a malloc fails, returns NULL, and
 296   // the buffer is then used, it provides a handy mapping of memory starting at
 297   // address 0 for an attacker to utilize.
 298   abort();
 299 }
 300
 301 OOM_INFO g_oom_info = {
 302   1,
 303   OOM_Handler
 304 };
 305
 306 PDFiumEngine* g_engine_for_unsupported;
 307
 308 void Unsupported_Handler(UNSUPPORT_INFO*, int type) {
 309   if (!g_engine_for_unsupported) {
 310     NOTREACHED();
 311     return;
 312   }
 313
 314   g_engine_for_unsupported->UnsupportedFeature(type);
 315 }
 316
 317 UNSUPPORT_INFO g_unsuppored_info = {
 318   1,
 319   Unsupported_Handler
 320 };
 321
 322 // Set the destination page size and content area in points based on source
 323 // page rotation and orientation.
 324 //
 325 // |rotated| True if source page is rotated 90 degree or 270 degree.
 326 // |is_src_page_landscape| is true if the source page orientation is landscape.
 327 // |page_size| has the actual destination page size in points.
 328 // |content_rect| has the actual destination page printable area values in
 329 // points.
 330 void SetPageSizeAndContentRect(bool rotated,
 331                                bool is_src_page_landscape,
 332                                pp::Size* page_size,
 333                                pp::Rect* content_rect) {
 334   bool is_dst_page_landscape = page_size->width() > page_size->height();
 335   bool page_orientation_mismatched = is_src_page_landscape !=
 336                                      is_dst_page_landscape;
 337   bool rotate_dst_page = rotated ^ page_orientation_mismatched;
 338   if (rotate_dst_page) {
 339     page_size->SetSize(page_size->height(), page_size->width());
 340     content_rect->SetRect(content_rect->y(), content_rect->x(),
 341                           content_rect->height(), content_rect->width());
 342   }
 343 }
 344
 345 // Calculate the scale factor between |content_rect| and a page of size
 346 // |src_width| x |src_height|.
 347 //
 348 // |scale_to_fit| is true, if we need to calculate the scale factor.
 349 // |content_rect| specifies the printable area of the destination page, with
 350 // origin at left-bottom. Values are in points.
 351 // |src_width| specifies the source page width in points.
 352 // |src_height| specifies the source page height in points.
 353 // |rotated| True if source page is rotated 90 degree or 270 degree.
 354 double CalculateScaleFactor(bool scale_to_fit,
 355                             const pp::Rect& content_rect,
 356                             double src_width, double src_height, bool rotated) {
 357   if (!scale_to_fit || src_width == 0 || src_height == 0)
 358     return 1.0;
 359
 360   double actual_source_page_width = rotated ? src_height : src_width;
 361   double actual_source_page_height = rotated ? src_width : src_height;
 362   double ratio_x = static_cast<double>(content_rect.width()) /
 363                    actual_source_page_width;
 364   double ratio_y = static_cast<double>(content_rect.height()) /
 365                    actual_source_page_height;
 366   return std::min(ratio_x, ratio_y);
 367 }
 368
 369 // Compute source clip box boundaries based on the crop box / media box of
 370 // source page and scale factor.
 371 //
 372 // |page| Handle to the source page. Returned by FPDF_LoadPage function.
 373 // |scale_factor| specifies the scale factor that should be applied to source
 374 // clip box boundaries.
 375 // |rotated| True if source page is rotated 90 degree or 270 degree.
 376 // |clip_box| out param to hold the computed source clip box values.
 377 void CalculateClipBoxBoundary(FPDF_PAGE page, double scale_factor, bool rotated,
 378                               ClipBox* clip_box) {
 379   if (!FPDFPage_GetCropBox(page, &clip_box->left, &clip_box->bottom,
 380                            &clip_box->right, &clip_box->top)) {
 381     if (!FPDFPage_GetMediaBox(page, &clip_box->left, &clip_box->bottom,
 382                               &clip_box->right, &clip_box->top)) {
 383       // Make the default size to be letter size (8.5" X 11"). We are just
 384       // following the PDFium way of handling these corner cases. PDFium always
 385       // consider US-Letter as the default page size.
 386       float paper_width = 612;
 387       float paper_height = 792;
 388       clip_box->left = 0;
 389       clip_box->bottom = 0;
 390       clip_box->right = rotated ? paper_height : paper_width;
 391       clip_box->top = rotated ? paper_width : paper_height;
 392     }
 393   }
 394   clip_box->left *= scale_factor;
 395   clip_box->right *= scale_factor;
 396   clip_box->bottom *= scale_factor;
 397   clip_box->top *= scale_factor;
 398 }
 399
 400 // Calculate the clip box translation offset for a page that does need to be
 401 // scaled. All parameters are in points.
 402 //
 403 // |content_rect| specifies the printable area of the destination page, with
 404 // origin at left-bottom.
 405 // |source_clip_box| specifies the source clip box positions, relative to
 406 // origin at left-bottom.
 407 // |offset_x| and |offset_y| will contain the final translation offsets for the
 408 // source clip box, relative to origin at left-bottom.
 409 void CalculateScaledClipBoxOffset(const pp::Rect& content_rect,
 410                                   const ClipBox& source_clip_box,
 411                                   double* offset_x, double* offset_y) {
 412   const float clip_box_width = source_clip_box.right - source_clip_box.left;
 413   const float clip_box_height = source_clip_box.top - source_clip_box.bottom;
 414
 415   // Center the intended clip region to real clip region.
 416   *offset_x = (content_rect.width() - clip_box_width) / 2 + content_rect.x() -
 417               source_clip_box.left;
 418   *offset_y = (content_rect.height() - clip_box_height) / 2 + content_rect.y() -
 419               source_clip_box.bottom;
 420 }
 421
 422 // Calculate the clip box offset for a page that does not need to be scaled.
 423 // All parameters are in points.
 424 //
 425 // |content_rect| specifies the printable area of the destination page, with
 426 // origin at left-bottom.
 427 // |rotation| specifies the source page rotation values which are N / 90
 428 // degrees.
 429 // |page_width| specifies the screen destination page width.
 430 // |page_height| specifies the screen destination page height.
 431 // |source_clip_box| specifies the source clip box positions, relative to origin
 432 // at left-bottom.
 433 // |offset_x| and |offset_y| will contain the final translation offsets for the
 434 // source clip box, relative to origin at left-bottom.
 435 void CalculateNonScaledClipBoxOffset(const pp::Rect& content_rect, int rotation,
 436                                      int page_width, int page_height,
 437                                      const ClipBox& source_clip_box,
 438                                      double* offset_x, double* offset_y) {
 439   // Align the intended clip region to left-top corner of real clip region.
 440   switch (rotation) {
 441     case 0:
 442       *offset_x = -1 * source_clip_box.left;
 443       *offset_y = page_height - source_clip_box.top;
 444       break;
 445     case 1:
 446       *offset_x = 0;
 447       *offset_y = -1 * source_clip_box.bottom;
 448       break;
 449     case 2:
 450       *offset_x = page_width - source_clip_box.right;
 451       *offset_y = 0;
 452       break;
 453     case 3:
 454       *offset_x = page_height - source_clip_box.right;
 455       *offset_y = page_width - source_clip_box.top;
 456       break;
 457     default:
 458       NOTREACHED();
 459       break;
 460   }
 461 }
 462
 463 // This formats a string with special 0xfffe end-of-line hyphens the same way
 464 // as Adobe Reader. When a hyphen is encountered, the next non-CR/LF whitespace
 465 // becomes CR+LF and the hyphen is erased. If there is no whitespace between
 466 // two hyphens, the latter hyphen is erased and ignored.
 467 void FormatStringWithHyphens(base::string16* text) {
 468   // First pass marks all the hyphen positions.
 469   struct HyphenPosition {
 470     HyphenPosition() : position(0), next_whitespace_position(0) {}
 471     size_t position;
 472     size_t next_whitespace_position;  // 0 for none
 473   };
 474   std::vector<HyphenPosition> hyphen_positions;
 475   HyphenPosition current_hyphen_position;
 476   bool current_hyphen_position_is_valid = false;
 477   const base::char16 kPdfiumHyphenEOL = 0xfffe;
 478
 479   for (size_t i = 0; i < text->size(); ++i) {
 480     const base::char16& current_char = (*text)[i];
 481     if (current_char == kPdfiumHyphenEOL) {
 482       if (current_hyphen_position_is_valid)
 483         hyphen_positions.push_back(current_hyphen_position);
 484       current_hyphen_position = HyphenPosition();
 485       current_hyphen_position.position = i;
 486       current_hyphen_position_is_valid = true;
 487     } else if (IsWhitespace(current_char)) {
 488       if (current_hyphen_position_is_valid) {
 489         if (current_char != L'\r' && current_char != L'\n')
 490           current_hyphen_position.next_whitespace_position = i;
 491         hyphen_positions.push_back(current_hyphen_position);
 492         current_hyphen_position_is_valid = false;
 493       }
 494     }
 495   }
 496   if (current_hyphen_position_is_valid)
 497     hyphen_positions.push_back(current_hyphen_position);
 498
 499   // With all the hyphen positions, do the search and replace.
 500   while (!hyphen_positions.empty()) {
 501     static const base::char16 kCr[] = {L'\r', L'\0'};
 502     const HyphenPosition& position = hyphen_positions.back();
 503     if (position.next_whitespace_position != 0) {
 504       (*text)[position.next_whitespace_position] = L'\n';
 505       text->insert(position.next_whitespace_position, kCr);
 506     }
 507     text->erase(position.position, 1);
 508     hyphen_positions.pop_back();
 509   }
 510
 511   // Adobe Reader also get rid of trailing spaces right before a CRLF.
 512   static const base::char16 kSpaceCrCn[] = {L' ', L'\r', L'\n', L'\0'};
 513   static const base::char16 kCrCn[] = {L'\r', L'\n', L'\0'};
 514   ReplaceSubstringsAfterOffset(text, 0, kSpaceCrCn, kCrCn);
 515 }
 516
 517 // Replace CR/LF with just LF on POSIX.
 518 void FormatStringForOS(base::string16* text) {
 519 #if defined(OS_POSIX)
 520   static const base::char16 kCr[] = {L'\r', L'\0'};
 521   static const base::char16 kBlank[] = {L'\0'};
 522   base::ReplaceChars(*text, kCr, kBlank, text);
 523 #elif defined(OS_WIN)
 524   // Do nothing
 525 #else
 526   NOTIMPLEMENTED();
 527 #endif
 528 }
 529
 530 }  // namespace
 531
 532 bool InitializeSDK(void* data) {
 533   FPDF_InitLibrary(data);
 534
 535 #if defined(OS_LINUX)
 536   // Font loading doesn't work in the renderer sandbox in Linux.
 537   FPDF_SetSystemFontInfo(&g_font_info);
 538 #endif
 539
 540   FSDK_SetOOMHandler(&g_oom_info);
 541   FSDK_SetUnSpObjProcessHandler(&g_unsuppored_info);
 542
 543   return true;
 544 }
 545
 546 void ShutdownSDK() {
 547   FPDF_DestroyLibrary();
 548 }
 549
 550 PDFEngine* PDFEngine::Create(PDFEngine::Client* client) {
 551   return new PDFiumEngine(client);
 552 }
 553
 554 PDFiumEngine::PDFiumEngine(PDFEngine::Client* client)
 555     : client_(client),
 556       current_zoom_(1.0),
 557       current_rotation_(0),
 558       doc_loader_(this),
 559       password_tries_remaining_(0),
 560       doc_(NULL),
 561       form_(NULL),
 562       defer_page_unload_(false),
 563       selecting_(false),
 564       mouse_down_state_(PDFiumPage::NONSELECTABLE_AREA,
 565                         PDFiumPage::LinkTarget()),
 566       next_page_to_search_(-1),
 567       last_page_to_search_(-1),
 568       last_character_index_to_search_(-1),
 569       permissions_(0),
 570       fpdf_availability_(NULL),
 571       next_timer_id_(0),
 572       last_page_mouse_down_(-1),
 573       first_visible_page_(-1),
 574       most_visible_page_(-1),
 575       called_do_document_action_(false),
 576       render_grayscale_(false),
 577       progressive_paint_timeout_(0),
 578       getting_password_(false) {
 579   find_factory_.Initialize(this);
 580   password_factory_.Initialize(this);
 581
 582   file_access_.m_FileLen = 0;
 583   file_access_.m_GetBlock = &GetBlock;
 584   file_access_.m_Param = &doc_loader_;
 585
 586   file_availability_.version = 1;
 587   file_availability_.IsDataAvail = &IsDataAvail;
 588   file_availability_.loader = &doc_loader_;
 589
 590   download_hints_.version = 1;
 591   download_hints_.AddSegment = &AddSegment;
 592   download_hints_.loader = &doc_loader_;
 593
 594   // Initialize FPDF_FORMFILLINFO member variables.  Deriving from this struct
 595   // allows the static callbacks to be able to cast the FPDF_FORMFILLINFO in
 596   // callbacks to ourself instead of maintaining a map of them to
 597   // PDFiumEngine.
 598   FPDF_FORMFILLINFO::version = 1;
 599   FPDF_FORMFILLINFO::m_pJsPlatform = this;
 600   FPDF_FORMFILLINFO::Release = NULL;
 601   FPDF_FORMFILLINFO::FFI_Invalidate = Form_Invalidate;
 602   FPDF_FORMFILLINFO::FFI_OutputSelectedRect = Form_OutputSelectedRect;
 603   FPDF_FORMFILLINFO::FFI_SetCursor = Form_SetCursor;
 604   FPDF_FORMFILLINFO::FFI_SetTimer = Form_SetTimer;
 605   FPDF_FORMFILLINFO::FFI_KillTimer = Form_KillTimer;
 606   FPDF_FORMFILLINFO::FFI_GetLocalTime = Form_GetLocalTime;
 607   FPDF_FORMFILLINFO::FFI_OnChange = Form_OnChange;
 608   FPDF_FORMFILLINFO::FFI_GetPage = Form_GetPage;
 609   FPDF_FORMFILLINFO::FFI_GetCurrentPage = Form_GetCurrentPage;
 610   FPDF_FORMFILLINFO::FFI_GetRotation = Form_GetRotation;
 611   FPDF_FORMFILLINFO::FFI_ExecuteNamedAction = Form_ExecuteNamedAction;
 612   FPDF_FORMFILLINFO::FFI_SetTextFieldFocus = Form_SetTextFieldFocus;
 613   FPDF_FORMFILLINFO::FFI_DoURIAction = Form_DoURIAction;
 614   FPDF_FORMFILLINFO::FFI_DoGoToAction = Form_DoGoToAction;
 615
 616   IPDF_JSPLATFORM::version = 1;
 617   IPDF_JSPLATFORM::app_alert = Form_Alert;
 618   IPDF_JSPLATFORM::app_beep = Form_Beep;
 619   IPDF_JSPLATFORM::app_response = Form_Response;
 620   IPDF_JSPLATFORM::Doc_getFilePath = Form_GetFilePath;
 621   IPDF_JSPLATFORM::Doc_mail = Form_Mail;
 622   IPDF_JSPLATFORM::Doc_print = Form_Print;
 623   IPDF_JSPLATFORM::Doc_submitForm = Form_SubmitForm;
 624   IPDF_JSPLATFORM::Doc_gotoPage = Form_GotoPage;
 625   IPDF_JSPLATFORM::Field_browse = Form_Browse;
 626
 627   IFSDK_PAUSE::version = 1;
 628   IFSDK_PAUSE::user = NULL;
 629   IFSDK_PAUSE::NeedToPauseNow = Pause_NeedToPauseNow;
 630 }
 631
 632 PDFiumEngine::~PDFiumEngine() {
 633   for (size_t i = 0; i < pages_.size(); ++i)
 634     pages_[i]->Unload();
 635
 636   if (doc_) {
 637     if (form_) {
 638       FORM_DoDocumentAAction(form_, FPDFDOC_AACTION_WC);
 639       FPDFDOC_ExitFormFillEnviroument(form_);
 640     }
 641     FPDF_CloseDocument(doc_);
 642   }
 643
 644   if (fpdf_availability_)
 645     FPDFAvail_Destroy(fpdf_availability_);
 646
 647   STLDeleteElements(&pages_);
 648 }
 649
 650 int PDFiumEngine::GetBlock(void* param, unsigned long position,
 651                            unsigned char* buffer, unsigned long size) {
 652   DocumentLoader* loader = static_cast<DocumentLoader*>(param);
 653   return loader->GetBlock(position, size, buffer);
 654 }
 655
 656 bool PDFiumEngine::IsDataAvail(FX_FILEAVAIL* param,
 657                                size_t offset, size_t size) {
 658   PDFiumEngine::FileAvail* file_avail =
 659       static_cast<PDFiumEngine::FileAvail*>(param);
 660   return file_avail->loader->IsDataAvailable(offset, size);
 661 }
 662
 663 void PDFiumEngine::AddSegment(FX_DOWNLOADHINTS* param,
 664                               size_t offset, size_t size) {
 665   PDFiumEngine::DownloadHints* download_hints =
 666       static_cast<PDFiumEngine::DownloadHints*>(param);
 667   return download_hints->loader->RequestData(offset, size);
 668 }
 669
 670 bool PDFiumEngine::New(const char* url) {
 671   url_ = url;
 672   headers_ = std::string();
 673   return true;
 674 }
 675
 676 bool PDFiumEngine::New(const char* url,
 677                        const char* headers) {
 678   url_ = url;
 679   if (!headers)
 680     headers_ = std::string();
 681   else
 682     headers_ = headers;
 683   return true;
 684 }
 685
 686 void PDFiumEngine::PageOffsetUpdated(const pp::Point& page_offset) {
 687   page_offset_ = page_offset;
 688 }
 689
 690 void PDFiumEngine::PluginSizeUpdated(const pp::Size& size) {
 691   CancelPaints();
 692
 693   plugin_size_ = size;
 694   CalculateVisiblePages();
 695 }
 696
 697 void PDFiumEngine::ScrolledToXPosition(int position) {
 698   CancelPaints();
 699
 700   int old_x = position_.x();
 701   position_.set_x(position);
 702   CalculateVisiblePages();
 703   client_->Scroll(pp::Point(old_x - position, 0));
 704 }
 705
 706 void PDFiumEngine::ScrolledToYPosition(int position) {
 707   CancelPaints();
 708
 709   int old_y = position_.y();
 710   position_.set_y(position);
 711   CalculateVisiblePages();
 712   client_->Scroll(pp::Point(0, old_y - position));
 713 }
 714
 715 void PDFiumEngine::PrePaint() {
 716   for (size_t i = 0; i < progressive_paints_.size(); ++i)
 717     progressive_paints_[i].painted_ = false;
 718 }
 719
 720 void PDFiumEngine::Paint(const pp::Rect& rect,
 721                          pp::ImageData* image_data,
 722                          std::vector<pp::Rect>* ready,
 723                          std::vector<pp::Rect>* pending) {
 724   pp::Rect leftover = rect;
 725   for (size_t i = 0; i < visible_pages_.size(); ++i) {
 726     int index = visible_pages_[i];
 727     pp::Rect page_rect = pages_[index]->rect();
 728     // Convert the current page's rectangle to screen rectangle.  We do this
 729     // instead of the reverse (converting the dirty rectangle from screen to
 730     // page coordinates) because then we'd have to convert back to screen
 731     // coordinates, and the rounding errors sometime leave pixels dirty or even
 732     // move the text up or down a pixel when zoomed.
 733     pp::Rect page_rect_in_screen = GetPageScreenRect(index);
 734     pp::Rect dirty_in_screen = page_rect_in_screen.Intersect(leftover);
 735     if (dirty_in_screen.IsEmpty())
 736       continue;
 737
 738     leftover = leftover.Subtract(dirty_in_screen);
 739
 740     if (pages_[index]->available()) {
 741       int progressive = GetProgressiveIndex(index);
 742       if (progressive != -1 &&
 743           progressive_paints_[progressive].rect != dirty_in_screen) {
 744         // The PDFium code can only handle one progressive paint at a time, so
 745         // queue this up. Previously we used to merge the rects when this
 746         // happened, but it made scrolling up on complex PDFs very slow since
 747         // there would be a damaged rect at the top (from scroll) and at the
 748         // bottom (from toolbar).
 749         pending->push_back(dirty_in_screen);
 750         continue;
 751       }
 752
 753       if (progressive == -1) {
 754         progressive = StartPaint(index, dirty_in_screen);
 755         progressive_paint_timeout_ = kMaxInitialProgressivePaintTimeMs;
 756       } else {
 757         progressive_paint_timeout_ = kMaxProgressivePaintTimeMs;
 758       }
 759
 760       progressive_paints_[progressive].painted_ = true;
 761       if (ContinuePaint(progressive, image_data)) {
 762         FinishPaint(progressive, image_data);
 763         ready->push_back(dirty_in_screen);
 764       } else {
 765         pending->push_back(dirty_in_screen);
 766       }
 767     } else {
 768       PaintUnavailablePage(index, dirty_in_screen, image_data);
 769       ready->push_back(dirty_in_screen);
 770     }
 771   }
 772 }
 773
 774 void PDFiumEngine::PostPaint() {
 775   for (size_t i = 0; i < progressive_paints_.size(); ++i) {
 776     if (progressive_paints_[i].painted_)
 777       continue;
 778
 779     // This rectangle must have been merged with another one, that's why we
 780     // weren't asked to paint it. Remove it or otherwise we'll never finish
 781     // painting.
 782     FPDF_RenderPage_Close(
 783         pages_[progressive_paints_[i].page_index]->GetPage());
 784     FPDFBitmap_Destroy(progressive_paints_[i].bitmap);
 785     progressive_paints_.erase(progressive_paints_.begin() + i);
 786     --i;
 787   }
 788 }
 789
 790 bool PDFiumEngine::HandleDocumentLoad(const pp::URLLoader& loader) {
 791   password_tries_remaining_ = kMaxPasswordTries;
 792   return doc_loader_.Init(loader, url_, headers_);
 793 }
 794
 795 pp::Instance* PDFiumEngine::GetPluginInstance() {
 796   return client_->GetPluginInstance();
 797 }
 798
 799 pp::URLLoader PDFiumEngine::CreateURLLoader() {
 800   return client_->CreateURLLoader();
 801 }
 802
 803 void PDFiumEngine::AppendPage(PDFEngine* engine, int index) {
 804   // Unload and delete the blank page before appending.
 805   pages_[index]->Unload();
 806   pages_[index]->set_calculated_links(false);
 807   pp::Size curr_page_size = GetPageSize(index);
 808   FPDFPage_Delete(doc_, index);
 809   FPDF_ImportPages(doc_,
 810                    static_cast<PDFiumEngine*>(engine)->doc(),
 811                    "1",
 812                    index);
 813   pp::Size new_page_size = GetPageSize(index);
 814   if (curr_page_size != new_page_size)
 815     LoadPageInfo(true);
 816   client_->Invalidate(GetPageScreenRect(index));
 817 }
 818
 819 pp::Point PDFiumEngine::GetScrollPosition() {
 820   return position_;
 821 }
 822
 823 void PDFiumEngine::SetScrollPosition(const pp::Point& position) {
 824   position_ = position;
 825 }
 826
 827 bool PDFiumEngine::IsProgressiveLoad() {
 828   return doc_loader_.is_partial_document();
 829 }
 830
 831 void PDFiumEngine::OnPartialDocumentLoaded() {
 832   file_access_.m_FileLen = doc_loader_.document_size();
 833   fpdf_availability_ = FPDFAvail_Create(&file_availability_, &file_access_);
 834   DCHECK(fpdf_availability_);
 835
 836   // Currently engine does not deal efficiently with some non-linearized files.
 837   // See http://code.google.com/p/chromium/issues/detail?id=59400
 838   // To improve user experience we download entire file for non-linearized PDF.
 839   if (!FPDFAvail_IsLinearized(fpdf_availability_)) {
 840     doc_loader_.RequestData(0, doc_loader_.document_size());
 841     return;
 842   }
 843
 844   LoadDocument();
 845 }
 846
 847 void PDFiumEngine::OnPendingRequestComplete() {
 848   if (!doc_ || !form_) {
 849     LoadDocument();
 850     return;
 851   }
 852
 853   // LoadDocument() will result in |pending_pages_| being reset so there's no
 854   // need to run the code below in that case.
 855   bool update_pages = false;
 856   std::vector<int> still_pending;
 857   for (size_t i = 0; i < pending_pages_.size(); ++i) {
 858     if (CheckPageAvailable(pending_pages_[i], &still_pending)) {
 859       update_pages = true;
 860       if (IsPageVisible(pending_pages_[i]))
 861         client_->Invalidate(GetPageScreenRect(pending_pages_[i]));
 862     }
 863   }
 864   pending_pages_.swap(still_pending);
 865   if (update_pages)
 866     LoadPageInfo(true);
 867 }
 868
 869 void PDFiumEngine::OnNewDataAvailable() {
 870   client_->DocumentLoadProgress(doc_loader_.GetAvailableData(),
 871                                 doc_loader_.document_size());
 872 }
 873
 874 void PDFiumEngine::OnDocumentComplete() {
 875   if (!doc_ || !form_) {
 876     file_access_.m_FileLen = doc_loader_.document_size();
 877     LoadDocument();
 878     return;
 879   }
 880
 881   bool need_update = false;
 882   for (size_t i = 0; i < pages_.size(); ++i) {
 883     if (pages_[i]->available())
 884       continue;
 885
 886     pages_[i]->set_available(true);
 887     // We still need to call IsPageAvail() even if the whole document is
 888     // already downloaded.
 889     FPDFAvail_IsPageAvail(fpdf_availability_, i, &download_hints_);
 890     need_update = true;
 891     if (IsPageVisible(i))
 892       client_->Invalidate(GetPageScreenRect(i));
 893   }
 894   if (need_update)
 895     LoadPageInfo(true);
 896
 897   FinishLoadingDocument();
 898 }
 899
 900 void PDFiumEngine::FinishLoadingDocument() {
 901   DCHECK(doc_loader_.IsDocumentComplete() && doc_);
 902   if (called_do_document_action_)
 903     return;
 904   called_do_document_action_ = true;
 905
 906   // These can only be called now, as the JS might end up needing a page.
 907   FORM_DoDocumentJSAction(form_);
 908   FORM_DoDocumentOpenAction(form_);
 909   if (most_visible_page_ != -1) {
 910     FPDF_PAGE new_page = pages_[most_visible_page_]->GetPage();
 911     FORM_DoPageAAction(new_page, form_, FPDFPAGE_AACTION_OPEN);
 912   }
 913
 914   if (doc_) // This can only happen if loading |doc_| fails.
 915     client_->DocumentLoadComplete(pages_.size());
 916 }
 917
 918 void PDFiumEngine::UnsupportedFeature(int type) {
 919   std::string feature;
 920   switch (type) {
 921     case FPDF_UNSP_DOC_XFAFORM:
 922       feature = "XFA";
 923       break;
 924     case FPDF_UNSP_DOC_PORTABLECOLLECTION:
 925       feature = "Portfolios_Packages";
 926       break;
 927     case FPDF_UNSP_DOC_ATTACHMENT:
 928     case FPDF_UNSP_ANNOT_ATTACHMENT:
 929       feature = "Attachment";
 930       break;
 931     case FPDF_UNSP_DOC_SECURITY:
 932       feature = "Rights_Management";
 933       break;
 934     case FPDF_UNSP_DOC_SHAREDREVIEW:
 935       feature = "Shared_Review";
 936       break;
 937     case FPDF_UNSP_DOC_SHAREDFORM_ACROBAT:
 938     case FPDF_UNSP_DOC_SHAREDFORM_FILESYSTEM:
 939     case FPDF_UNSP_DOC_SHAREDFORM_EMAIL:
 940       feature = "Shared_Form";
 941       break;
 942     case FPDF_UNSP_ANNOT_3DANNOT:
 943       feature = "3D";
 944       break;
 945     case FPDF_UNSP_ANNOT_MOVIE:
 946       feature = "Movie";
 947       break;
 948     case FPDF_UNSP_ANNOT_SOUND:
 949       feature = "Sound";
 950       break;
 951     case FPDF_UNSP_ANNOT_SCREEN_MEDIA:
 952     case FPDF_UNSP_ANNOT_SCREEN_RICHMEDIA:
 953       feature = "Screen";
 954       break;
 955     case FPDF_UNSP_ANNOT_SIG:
 956       feature = "Digital_Signature";
 957       break;
 958   }
 959   client_->DocumentHasUnsupportedFeature(feature);
 960 }
 961
 962 void PDFiumEngine::ContinueFind(int32_t result) {
 963   StartFind(current_find_text_.c_str(), !!result);
 964 }
 965
 966 bool PDFiumEngine::HandleEvent(const pp::InputEvent& event) {
 967   DCHECK(!defer_page_unload_);
 968   defer_page_unload_ = true;
 969   bool rv = false;
 970   switch (event.GetType()) {
 971     case PP_INPUTEVENT_TYPE_MOUSEDOWN:
 972       rv = OnMouseDown(pp::MouseInputEvent(event));
 973       break;
 974     case PP_INPUTEVENT_TYPE_MOUSEUP:
 975       rv = OnMouseUp(pp::MouseInputEvent(event));
 976       break;
 977     case PP_INPUTEVENT_TYPE_MOUSEMOVE:
 978       rv = OnMouseMove(pp::MouseInputEvent(event));
 979       break;
 980     case PP_INPUTEVENT_TYPE_KEYDOWN:
 981       rv = OnKeyDown(pp::KeyboardInputEvent(event));
 982       break;
 983     case PP_INPUTEVENT_TYPE_KEYUP:
 984       rv = OnKeyUp(pp::KeyboardInputEvent(event));
 985       break;
 986     case PP_INPUTEVENT_TYPE_CHAR:
 987       rv = OnChar(pp::KeyboardInputEvent(event));
 988       break;
 989     default:
 990       break;
 991   }
 992
 993   DCHECK(defer_page_unload_);
 994   defer_page_unload_ = false;
 995   for (size_t i = 0; i < deferred_page_unloads_.size(); ++i)
 996     pages_[deferred_page_unloads_[i]]->Unload();
 997   deferred_page_unloads_.clear();
 998   return rv;
 999 }
1000
1001 uint32_t PDFiumEngine::QuerySupportedPrintOutputFormats() {
1002   if (!HasPermission(PDFEngine::PERMISSION_PRINT_LOW_QUALITY))
1003     return 0;
1004   return PP_PRINTOUTPUTFORMAT_PDF;
1005 }
1006
1007 void PDFiumEngine::PrintBegin() {
1008   FORM_DoDocumentAAction(form_, FPDFDOC_AACTION_WP);
1009 }
1010
1011 pp::Resource PDFiumEngine::PrintPages(
1012     const PP_PrintPageNumberRange_Dev* page_ranges, uint32_t page_range_count,
1013     const PP_PrintSettings_Dev& print_settings) {
1014   if (HasPermission(PDFEngine::PERMISSION_PRINT_HIGH_QUALITY))
1015     return PrintPagesAsPDF(page_ranges, page_range_count, print_settings);
1016   else if (HasPermission(PDFEngine::PERMISSION_PRINT_LOW_QUALITY))
1017     return PrintPagesAsRasterPDF(page_ranges, page_range_count, print_settings);
1018   return pp::Resource();
1019 }
1020
1021 FPDF_DOCUMENT PDFiumEngine::CreateSinglePageRasterPdf(
1022     double source_page_width,
1023     double source_page_height,
1024     const PP_PrintSettings_Dev& print_settings,
1025     PDFiumPage* page_to_print) {
1026   FPDF_DOCUMENT temp_doc = FPDF_CreateNewDocument();
1027   if (!temp_doc)
1028     return temp_doc;
1029
1030   const pp::Size& bitmap_size(page_to_print->rect().size());
1031
1032   FPDF_PAGE temp_page =
1033       FPDFPage_New(temp_doc, 0, source_page_width, source_page_height);
1034
1035   pp::ImageData image = pp::ImageData(client_->GetPluginInstance(),
1036                                       PP_IMAGEDATAFORMAT_BGRA_PREMUL,
1037                                       bitmap_size,
1038                                       false);
1039
1040   FPDF_BITMAP bitmap = FPDFBitmap_CreateEx(bitmap_size.width(),
1041                                            bitmap_size.height(),
1042                                            FPDFBitmap_BGRx,
1043                                            image.data(),
1044                                            image.stride());
1045
1046   // Clear the bitmap
1047   FPDFBitmap_FillRect(
1048       bitmap, 0, 0, bitmap_size.width(), bitmap_size.height(), 0xFFFFFFFF);
1049
1050   pp::Rect page_rect = page_to_print->rect();
1051   FPDF_RenderPageBitmap(bitmap,
1052                         page_to_print->GetPrintPage(),
1053                         page_rect.x(),
1054                         page_rect.y(),
1055                         page_rect.width(),
1056                         page_rect.height(),
1057                         print_settings.orientation,
1058                         FPDF_ANNOT | FPDF_PRINTING | FPDF_NO_CATCH);
1059
1060   double ratio_x = (static_cast<double>(bitmap_size.width()) * kPointsPerInch) /
1061                    print_settings.dpi;
1062   double ratio_y =
1063       (static_cast<double>(bitmap_size.height()) * kPointsPerInch) /
1064       print_settings.dpi;
1065
1066   // Add the bitmap to an image object and add the image object to the output
1067   // page.
1068   FPDF_PAGEOBJECT temp_img = FPDFPageObj_NewImgeObj(temp_doc);
1069   FPDFImageObj_SetBitmap(&temp_page, 1, temp_img, bitmap);
1070   FPDFImageObj_SetMatrix(temp_img, ratio_x, 0, 0, ratio_y, 0, 0);
1071   FPDFPage_InsertObject(temp_page, temp_img);
1072   FPDFPage_GenerateContent(temp_page);
1073   FPDF_ClosePage(temp_page);
1074
1075   page_to_print->ClosePrintPage();
1076   FPDFBitmap_Destroy(bitmap);
1077
1078   return temp_doc;
1079 }
1080
1081 pp::Buffer_Dev PDFiumEngine::PrintPagesAsRasterPDF(
1082     const PP_PrintPageNumberRange_Dev* page_ranges, uint32_t page_range_count,
1083     const PP_PrintSettings_Dev& print_settings) {
1084   if (!page_range_count)
1085     return pp::Buffer_Dev();
1086
1087   // If document is not downloaded yet, disable printing.
1088   if (doc_ && !doc_loader_.IsDocumentComplete())
1089     return pp::Buffer_Dev();
1090
1091   FPDF_DOCUMENT output_doc = FPDF_CreateNewDocument();
1092   if (!output_doc)
1093     return pp::Buffer_Dev();
1094
1095   SaveSelectedFormForPrint();
1096
1097   std::vector<PDFiumPage> pages_to_print;
1098   // width and height of source PDF pages.
1099   std::vector<std::pair<double, double> > source_page_sizes;
1100   // Collect pages to print and sizes of source pages.
1101   std::vector<uint32_t> page_numbers =
1102       GetPageNumbersFromPrintPageNumberRange(page_ranges, page_range_count);
1103   for (size_t i = 0; i < page_numbers.size(); ++i) {
1104     uint32_t page_number = page_numbers[i];
1105     FPDF_PAGE pdf_page = FPDF_LoadPage(doc_, page_number);
1106     double source_page_width = FPDF_GetPageWidth(pdf_page);
1107     double source_page_height = FPDF_GetPageHeight(pdf_page);
1108     source_page_sizes.push_back(std::make_pair(source_page_width,
1109                                                source_page_height));
1110
1111     int width_in_pixels = ConvertUnit(source_page_width,
1112                                       static_cast<int>(kPointsPerInch),
1113                                       print_settings.dpi);
1114     int height_in_pixels = ConvertUnit(source_page_height,
1115                                        static_cast<int>(kPointsPerInch),
1116                                        print_settings.dpi);
1117
1118     pp::Rect rect(width_in_pixels, height_in_pixels);
1119     pages_to_print.push_back(PDFiumPage(this, page_number, rect, true));
1120     FPDF_ClosePage(pdf_page);
1121   }
1122
1123 #if defined(OS_LINUX)
1124   g_last_instance_id = client_->GetPluginInstance()->pp_instance();
1125 #endif
1126
1127   size_t i = 0;
1128   for (; i < pages_to_print.size(); ++i) {
1129     double source_page_width = source_page_sizes[i].first;
1130     double source_page_height = source_page_sizes[i].second;
1131
1132     // Use temp_doc to compress image by saving PDF to buffer.
1133     FPDF_DOCUMENT temp_doc = CreateSinglePageRasterPdf(source_page_width,
1134                                                        source_page_height,
1135                                                        print_settings,
1136                                                        &pages_to_print[i]);
1137
1138     if (!temp_doc)
1139       break;
1140
1141     pp::Buffer_Dev buffer = GetFlattenedPrintData(temp_doc);
1142     FPDF_CloseDocument(temp_doc);
1143
1144     PDFiumMemBufferFileRead file_read(buffer.data(), buffer.size());
1145     temp_doc = FPDF_LoadCustomDocument(&file_read, NULL);
1146
1147     FPDF_BOOL imported = FPDF_ImportPages(output_doc, temp_doc, "1", i);
1148     FPDF_CloseDocument(temp_doc);
1149     if (!imported)
1150       break;
1151   }
1152
1153   pp::Buffer_Dev buffer;
1154   if (i == pages_to_print.size()) {
1155     FPDF_CopyViewerPreferences(output_doc, doc_);
1156     FitContentsToPrintableAreaIfRequired(output_doc, print_settings);
1157     // Now flatten all the output pages.
1158     buffer = GetFlattenedPrintData(output_doc);
1159   }
1160   FPDF_CloseDocument(output_doc);
1161   return buffer;
1162 }
1163
1164 pp::Buffer_Dev PDFiumEngine::GetFlattenedPrintData(const FPDF_DOCUMENT& doc) {
1165   int page_count = FPDF_GetPageCount(doc);
1166   bool flatten_succeeded = true;
1167   for (int i = 0; i < page_count; ++i) {
1168     FPDF_PAGE page = FPDF_LoadPage(doc, i);
1169     DCHECK(page);
1170     if (page) {
1171       int flatten_ret = FPDFPage_Flatten(page, FLAT_PRINT);
1172       FPDF_ClosePage(page);
1173       if (flatten_ret == FLATTEN_FAIL) {
1174         flatten_succeeded = false;
1175         break;
1176       }
1177     } else {
1178       flatten_succeeded = false;
1179       break;
1180     }
1181   }
1182   if (!flatten_succeeded) {
1183     FPDF_CloseDocument(doc);
1184     return pp::Buffer_Dev();
1185   }
1186
1187   pp::Buffer_Dev buffer;
1188   PDFiumMemBufferFileWrite output_file_write;
1189   if (FPDF_SaveAsCopy(doc, &output_file_write, 0)) {
1190     buffer = pp::Buffer_Dev(
1191         client_->GetPluginInstance(), output_file_write.size());
1192     if (!buffer.is_null()) {
1193       memcpy(buffer.data(), output_file_write.buffer().c_str(),
1194              output_file_write.size());
1195     }
1196   }
1197   return buffer;
1198 }
1199
1200 pp::Buffer_Dev PDFiumEngine::PrintPagesAsPDF(
1201     const PP_PrintPageNumberRange_Dev* page_ranges, uint32_t page_range_count,
1202     const PP_PrintSettings_Dev& print_settings) {
1203   if (!page_range_count)
1204     return pp::Buffer_Dev();
1205
1206   DCHECK(doc_);
1207   FPDF_DOCUMENT output_doc = FPDF_CreateNewDocument();
1208   if (!output_doc)
1209     return pp::Buffer_Dev();
1210
1211   SaveSelectedFormForPrint();
1212
1213   std::string page_number_str;
1214   for (uint32_t index = 0; index < page_range_count; ++index) {
1215     if (!page_number_str.empty())
1216       page_number_str.append(",");
1217     page_number_str.append(
1218         base::IntToString(page_ranges[index].first_page_number + 1));
1219     if (page_ranges[index].first_page_number !=
1220             page_ranges[index].last_page_number) {
1221       page_number_str.append("-");
1222       page_number_str.append(
1223           base::IntToString(page_ranges[index].last_page_number + 1));
1224     }
1225   }
1226
1227   std::vector<uint32_t> page_numbers =
1228       GetPageNumbersFromPrintPageNumberRange(page_ranges, page_range_count);
1229   for (size_t i = 0; i < page_numbers.size(); ++i) {
1230     uint32_t page_number = page_numbers[i];
1231     pages_[page_number]->GetPage();
1232     if (!IsPageVisible(page_numbers[i]))
1233       pages_[page_number]->Unload();
1234   }
1235
1236   FPDF_CopyViewerPreferences(output_doc, doc_);
1237   if (!FPDF_ImportPages(output_doc, doc_, page_number_str.c_str(), 0)) {
1238     FPDF_CloseDocument(output_doc);
1239     return pp::Buffer_Dev();
1240   }
1241
1242   FitContentsToPrintableAreaIfRequired(output_doc, print_settings);
1243
1244   // Now flatten all the output pages.
1245   pp::Buffer_Dev buffer = GetFlattenedPrintData(output_doc);
1246   FPDF_CloseDocument(output_doc);
1247   return buffer;
1248 }
1249
1250 void PDFiumEngine::FitContentsToPrintableAreaIfRequired(
1251     const FPDF_DOCUMENT& doc, const PP_PrintSettings_Dev& print_settings) {
1252   // Check to see if we need to fit pdf contents to printer paper size.
1253   if (print_settings.print_scaling_option !=
1254           PP_PRINTSCALINGOPTION_SOURCE_SIZE) {
1255     int num_pages = FPDF_GetPageCount(doc);
1256     // In-place transformation is more efficient than creating a new
1257     // transformed document from the source document. Therefore, transform
1258     // every page to fit the contents in the selected printer paper.
1259     for (int i = 0; i < num_pages; ++i) {
1260       FPDF_PAGE page = FPDF_LoadPage(doc, i);
1261       TransformPDFPageForPrinting(page, print_settings);
1262       FPDF_ClosePage(page);
1263     }
1264   }
1265 }
1266
1267 void PDFiumEngine::SaveSelectedFormForPrint() {
1268   FORM_ForceToKillFocus(form_);
1269   client_->FormTextFieldFocusChange(false);
1270 }
1271
1272 void PDFiumEngine::PrintEnd() {
1273   FORM_DoDocumentAAction(form_, FPDFDOC_AACTION_DP);
1274 }
1275
1276 PDFiumPage::Area PDFiumEngine::GetCharIndex(
1277     const pp::MouseInputEvent& event, int* page_index,
1278     int* char_index, PDFiumPage::LinkTarget* target) {
1279   // First figure out which page this is in.
1280   pp::Point mouse_point = event.GetPosition();
1281   pp::Point point(
1282       static_cast<int>((mouse_point.x() + position_.x()) / current_zoom_),
1283       static_cast<int>((mouse_point.y() + position_.y()) / current_zoom_));
1284   return GetCharIndex(point, page_index, char_index, target);
1285 }
1286
1287 PDFiumPage::Area PDFiumEngine::GetCharIndex(
1288     const pp::Point& point,
1289     int* page_index,
1290     int* char_index,
1291     PDFiumPage::LinkTarget* target) {
1292   int page = -1;
1293   for (size_t i = 0; i < visible_pages_.size(); ++i) {
1294     if (pages_[visible_pages_[i]]->rect().Contains(point)) {
1295       page = visible_pages_[i];
1296       break;
1297     }
1298   }
1299   if (page == -1)
1300     return PDFiumPage::NONSELECTABLE_AREA;
1301
1302   // If the page hasn't finished rendering, calling into the page sometimes
1303   // leads to hangs.
1304   for (size_t i = 0; i < progressive_paints_.size(); ++i) {
1305     if (progressive_paints_[i].page_index == page)
1306       return PDFiumPage::NONSELECTABLE_AREA;
1307   }
1308
1309   *page_index = page;
1310   return pages_[page]->GetCharIndex(point, current_rotation_, char_index,
1311                                     target);
1312 }
1313
1314 bool PDFiumEngine::OnMouseDown(const pp::MouseInputEvent& event) {
1315   if (event.GetButton() != PP_INPUTEVENT_MOUSEBUTTON_LEFT)
1316     return false;
1317
1318   SelectionChangeInvalidator selection_invalidator(this);
1319   selection_.clear();
1320
1321   int page_index = -1;
1322   int char_index = -1;
1323   PDFiumPage::LinkTarget target;
1324   PDFiumPage::Area area = GetCharIndex(event, &page_index,
1325                                        &char_index, &target);
1326   mouse_down_state_.Set(area, target);
1327
1328   // Decide whether to open link or not based on user action in mouse up and
1329   // mouse move events.
1330   if (area == PDFiumPage::WEBLINK_AREA)
1331     return true;
1332
1333   if (area == PDFiumPage::DOCLINK_AREA) {
1334     client_->ScrollToPage(target.page);
1335     client_->FormTextFieldFocusChange(false);
1336     return true;
1337   }
1338
1339   if (page_index != -1) {
1340     last_page_mouse_down_ = page_index;
1341     double page_x, page_y;
1342     pp::Point point = event.GetPosition();
1343     DeviceToPage(page_index, point.x(), point.y(), &page_x, &page_y);
1344
1345     FORM_OnLButtonDown(form_, pages_[page_index]->GetPage(), 0, page_x, page_y);
1346     int control = FPDPage_HasFormFieldAtPoint(
1347         form_, pages_[page_index]->GetPage(), page_x, page_y);
1348     if (control > FPDF_FORMFIELD_UNKNOWN) {  // returns -1 sometimes...
1349       client_->FormTextFieldFocusChange(control == FPDF_FORMFIELD_TEXTFIELD ||
1350           control == FPDF_FORMFIELD_COMBOBOX);
1351       return true;  // Return now before we get into the selection code.
1352     }
1353   }
1354
1355   client_->FormTextFieldFocusChange(false);
1356
1357   if (area != PDFiumPage::TEXT_AREA)
1358     return true;  // Return true so WebKit doesn't do its own highlighting.
1359
1360   if (event.GetClickCount() == 1) {
1361     OnSingleClick(page_index, char_index);
1362   } else if (event.GetClickCount() == 2 ||
1363              event.GetClickCount() == 3) {
1364     OnMultipleClick(event.GetClickCount(), page_index, char_index);
1365   }
1366
1367   return true;
1368 }
1369
1370 void PDFiumEngine::OnSingleClick(int page_index, int char_index) {
1371   selecting_ = true;
1372   selection_.push_back(PDFiumRange(pages_[page_index], char_index, 0));
1373 }
1374
1375 void PDFiumEngine::OnMultipleClick(int click_count,
1376                                    int page_index,
1377                                    int char_index) {
1378   // It would be more efficient if the SDK could support finding a space, but
1379   // now it doesn't.
1380   int start_index = char_index;
1381   do {
1382     base::char16 cur = pages_[page_index]->GetCharAtIndex(start_index);
1383     // For double click, we want to select one word so we look for whitespace
1384     // boundaries.  For triple click, we want the whole line.
1385     if (cur == '\n' || (click_count == 2 && (cur == ' ' || cur == '\t')))
1386       break;
1387   } while (--start_index >= 0);
1388   if (start_index)
1389     start_index++;
1390
1391   int end_index = char_index;
1392   int total = pages_[page_index]->GetCharCount();
1393   while (end_index++ <= total) {
1394     base::char16 cur = pages_[page_index]->GetCharAtIndex(end_index);
1395     if (cur == '\n' || (click_count == 2 && (cur == ' ' || cur == '\t')))
1396       break;
1397   }
1398
1399   selection_.push_back(PDFiumRange(
1400       pages_[page_index], start_index, end_index - start_index));
1401 }
1402
1403 bool PDFiumEngine::OnMouseUp(const pp::MouseInputEvent& event) {
1404   if (event.GetButton() != PP_INPUTEVENT_MOUSEBUTTON_LEFT)
1405     return false;
1406
1407   int page_index = -1;
1408   int char_index = -1;
1409   PDFiumPage::LinkTarget target;
1410   PDFiumPage::Area area =
1411       GetCharIndex(event, &page_index, &char_index, &target);
1412
1413   // Open link on mouse up for same link for which mouse down happened earlier.
1414   if (mouse_down_state_.Matches(area, target)) {
1415     if (area == PDFiumPage::WEBLINK_AREA) {
1416       bool open_in_new_tab = !!(event.GetModifiers() & kDefaultKeyModifier);
1417       client_->NavigateTo(target.url, open_in_new_tab);
1418       client_->FormTextFieldFocusChange(false);
1419       return true;
1420     }
1421   }
1422
1423   if (page_index != -1) {
1424     double page_x, page_y;
1425     pp::Point point = event.GetPosition();
1426     DeviceToPage(page_index, point.x(), point.y(), &page_x, &page_y);
1427     FORM_OnLButtonUp(
1428         form_, pages_[page_index]->GetPage(), 0, page_x, page_y);
1429   }
1430
1431   if (!selecting_)
1432     return false;
1433
1434   selecting_ = false;
1435   return true;
1436 }
1437
1438 bool PDFiumEngine::OnMouseMove(const pp::MouseInputEvent& event) {
1439   int page_index = -1;
1440   int char_index = -1;
1441   PDFiumPage::LinkTarget target;
1442   PDFiumPage::Area area =
1443       GetCharIndex(event, &page_index, &char_index, &target);
1444
1445   // Clear |mouse_down_state_| if mouse moves away from where the mouse down
1446   // happened.
1447   if (!mouse_down_state_.Matches(area, target))
1448     mouse_down_state_.Reset();
1449
1450   if (!selecting_) {
1451     PP_CursorType_Dev cursor;
1452     switch (area) {
1453       case PDFiumPage::TEXT_AREA:
1454         cursor = PP_CURSORTYPE_IBEAM;
1455         break;
1456       case PDFiumPage::WEBLINK_AREA:
1457       case PDFiumPage::DOCLINK_AREA:
1458         cursor = PP_CURSORTYPE_HAND;
1459         break;
1460       case PDFiumPage::NONSELECTABLE_AREA:
1461       default:
1462         cursor = PP_CURSORTYPE_POINTER;
1463         break;
1464     }
1465
1466     if (page_index != -1) {
1467       double page_x, page_y;
1468       pp::Point point = event.GetPosition();
1469       DeviceToPage(page_index, point.x(), point.y(), &page_x, &page_y);
1470
1471       FORM_OnMouseMove(form_, pages_[page_index]->GetPage(), 0, page_x, page_y);
1472       int control = FPDPage_HasFormFieldAtPoint(
1473           form_, pages_[page_index]->GetPage(), page_x, page_y);
1474       switch (control) {
1475         case FPDF_FORMFIELD_PUSHBUTTON:
1476         case FPDF_FORMFIELD_CHECKBOX:
1477         case FPDF_FORMFIELD_RADIOBUTTON:
1478         case FPDF_FORMFIELD_COMBOBOX:
1479         case FPDF_FORMFIELD_LISTBOX:
1480           cursor = PP_CURSORTYPE_HAND;
1481           break;
1482         case FPDF_FORMFIELD_TEXTFIELD:
1483           cursor = PP_CURSORTYPE_IBEAM;
1484           break;
1485         default:
1486           break;
1487       }
1488     }
1489
1490     client_->UpdateCursor(cursor);
1491     pp::Point point = event.GetPosition();
1492     std::string url = GetLinkAtPosition(event.GetPosition());
1493     if (url != link_under_cursor_) {
1494       link_under_cursor_ = url;
1495       pp::PDF::SetLinkUnderCursor(GetPluginInstance(), url.c_str());
1496     }
1497     // No need to swallow the event, since this might interfere with the
1498     // scrollbars if the user is dragging them.
1499     return false;
1500   }
1501
1502   // We're selecting but right now we're not over text, so don't change the
1503   // current selection.
1504   if (area != PDFiumPage::TEXT_AREA && area != PDFiumPage::WEBLINK_AREA &&
1505       area != PDFiumPage::DOCLINK_AREA) {
1506     return false;
1507   }
1508
1509   SelectionChangeInvalidator selection_invalidator(this);
1510
1511   // Check if the user has descreased their selection area and we need to remove
1512   // pages from selection_.
1513   for (size_t i = 0; i < selection_.size(); ++i) {
1514     if (selection_[i].page_index() == page_index) {
1515       // There should be no other pages after this.
1516       selection_.erase(selection_.begin() + i + 1, selection_.end());
1517       break;
1518     }
1519   }
1520
1521   if (selection_.size() == 0)
1522     return false;
1523
1524   int last = selection_.size() - 1;
1525   if (selection_[last].page_index() == page_index) {
1526     // Selecting within a page.
1527     int count;
1528     if (char_index >= selection_[last].char_index()) {
1529       // Selecting forward.
1530       count = char_index - selection_[last].char_index() + 1;
1531     } else {
1532       count = char_index - selection_[last].char_index() - 1;
1533     }
1534     selection_[last].SetCharCount(count);
1535   } else if (selection_[last].page_index() < page_index) {
1536     // Selecting into the next page.
1537
1538     // First make sure that there are no gaps in selection, i.e. if mousedown on
1539     // page one but we only get mousemove over page three, we want page two.
1540     for (int i = selection_[last].page_index() + 1; i < page_index; ++i) {
1541       selection_.push_back(PDFiumRange(pages_[i], 0,
1542                            pages_[i]->GetCharCount()));
1543     }
1544
1545     int count = pages_[selection_[last].page_index()]->GetCharCount();
1546     selection_[last].SetCharCount(count - selection_[last].char_index());
1547     selection_.push_back(PDFiumRange(pages_[page_index], 0, char_index));
1548   } else {
1549     // Selecting into the previous page.
1550     selection_[last].SetCharCount(-selection_[last].char_index());
1551
1552     // First make sure that there are no gaps in selection, i.e. if mousedown on
1553     // page three but we only get mousemove over page one, we want page two.
1554     for (int i = selection_[last].page_index() - 1; i > page_index; --i) {
1555       selection_.push_back(PDFiumRange(pages_[i], 0,
1556                            pages_[i]->GetCharCount()));
1557     }
1558
1559     int count = pages_[page_index]->GetCharCount();
1560     selection_.push_back(
1561         PDFiumRange(pages_[page_index], count, count - char_index));
1562   }
1563
1564   return true;
1565 }
1566
1567 bool PDFiumEngine::OnKeyDown(const pp::KeyboardInputEvent& event) {
1568   if (last_page_mouse_down_ == -1)
1569     return false;
1570
1571   bool rv = !!FORM_OnKeyDown(
1572       form_, pages_[last_page_mouse_down_]->GetPage(),
1573       event.GetKeyCode(), event.GetModifiers());
1574
1575   if (event.GetKeyCode() == ui::VKEY_BACK ||
1576       event.GetKeyCode() == ui::VKEY_ESCAPE) {
1577     // Chrome doesn't send char events for backspace or escape keys, see
1578     // PlatformKeyboardEventBuilder::isCharacterKey() and
1579     // http://chrome-corpsvn.mtv.corp.google.com/viewvc?view=rev&root=chrome&revision=31805
1580     // for more information.  So just fake one since PDFium uses it.
1581     std::string str;
1582     str.push_back(event.GetKeyCode());
1583     pp::KeyboardInputEvent synthesized(pp::KeyboardInputEvent(
1584         client_->GetPluginInstance(),
1585         PP_INPUTEVENT_TYPE_CHAR,
1586         event.GetTimeStamp(),
1587         event.GetModifiers(),
1588         event.GetKeyCode(),
1589         str));
1590     OnChar(synthesized);
1591   }
1592
1593   return rv;
1594 }
1595
1596 bool PDFiumEngine::OnKeyUp(const pp::KeyboardInputEvent& event) {
1597   if (last_page_mouse_down_ == -1)
1598     return false;
1599
1600   return !!FORM_OnKeyUp(
1601       form_, pages_[last_page_mouse_down_]->GetPage(),
1602       event.GetKeyCode(), event.GetModifiers());
1603 }
1604
1605 bool PDFiumEngine::OnChar(const pp::KeyboardInputEvent& event) {
1606   if (last_page_mouse_down_ == -1)
1607     return false;
1608
1609   base::string16 str = base::UTF8ToUTF16(event.GetCharacterText().AsString());
1610   return !!FORM_OnChar(
1611       form_, pages_[last_page_mouse_down_]->GetPage(),
1612       str[0],
1613       event.GetModifiers());
1614 }
1615
1616 void PDFiumEngine::StartFind(const char* text, bool case_sensitive) {
1617   // We can get a call to StartFind before we have any page information (i.e.
1618   // before the first call to LoadDocument has happened). Handle this case.
1619   if (pages_.empty())
1620     return;
1621
1622   bool first_search = false;
1623   int character_to_start_searching_from = 0;
1624   if (current_find_text_ != text) {  // First time we search for this text.
1625     first_search = true;
1626     std::vector<PDFiumRange> old_selection = selection_;
1627     StopFind();
1628     current_find_text_ = text;
1629
1630     if (old_selection.empty()) {
1631       // Start searching from the beginning of the document.
1632       next_page_to_search_ = 0;
1633       last_page_to_search_ = pages_.size() - 1;
1634       last_character_index_to_search_ = -1;
1635     } else {
1636       // There's a current selection, so start from it.
1637       next_page_to_search_ = old_selection[0].page_index();
1638       last_character_index_to_search_ = old_selection[0].char_index();
1639       character_to_start_searching_from = old_selection[0].char_index();
1640       last_page_to_search_ = next_page_to_search_;
1641     }
1642   }
1643
1644   int current_page = next_page_to_search_;
1645
1646   if (pages_[current_page]->available()) {
1647     base::string16 str = base::UTF8ToUTF16(text);
1648     // Don't use PDFium to search for now, since it doesn't support unicode text.
1649     // Leave the code for now to avoid bit-rot, in case it's fixed later.
1650     if (0) {
1651       SearchUsingPDFium(
1652           str, case_sensitive, first_search, character_to_start_searching_from,
1653           current_page);
1654     } else {
1655       SearchUsingICU(
1656           str, case_sensitive, first_search, character_to_start_searching_from,
1657           current_page);
1658     }
1659
1660     if (!IsPageVisible(current_page))
1661       pages_[current_page]->Unload();
1662   }
1663
1664   if (next_page_to_search_ != last_page_to_search_ ||
1665       (first_search && last_character_index_to_search_ != -1)) {
1666     ++next_page_to_search_;
1667   }
1668
1669   if (next_page_to_search_ == static_cast<int>(pages_.size()))
1670     next_page_to_search_ = 0;
1671   // If there's only one page in the document and we start searching midway,
1672   // then we'll want to search the page one more time.
1673   bool end_of_search =
1674       next_page_to_search_ == last_page_to_search_ &&
1675       // Only one page but didn't start midway.
1676       ((pages_.size() == 1 && last_character_index_to_search_ == -1) ||
1677        // Started midway, but only 1 page and we already looped around.
1678        (pages_.size() == 1 && !first_search) ||
1679        // Started midway, and we've just looped around.
1680        (pages_.size() > 1 && current_page == next_page_to_search_));
1681
1682   if (end_of_search) {
1683     // Send the final notification.
1684     client_->NotifyNumberOfFindResultsChanged(find_results_.size(), true);
1685
1686     // When searching is complete, resume finding at a particular index.
1687     // Assuming the user has not clicked the find button in the meanwhile.
1688     if (resume_find_index_.valid() && !current_find_index_.valid()) {
1689       size_t resume_index = resume_find_index_.GetIndex();
1690       if (resume_index >= find_results_.size()) {
1691         // This might happen if the PDF has some dynamically generated text?
1692         resume_index = 0;
1693       }
1694       current_find_index_.SetIndex(resume_index);
1695       client_->NotifySelectedFindResultChanged(resume_index);
1696     }
1697     resume_find_index_.Invalidate();
1698   } else {
1699     pp::CompletionCallback callback =
1700         find_factory_.NewCallback(&PDFiumEngine::ContinueFind);
1701     pp::Module::Get()->core()->CallOnMainThread(
1702         0, callback, case_sensitive ? 1 : 0);
1703   }
1704 }
1705
1706 void PDFiumEngine::SearchUsingPDFium(const base::string16& term,
1707                                      bool case_sensitive,
1708                                      bool first_search,
1709                                      int character_to_start_searching_from,
1710                                      int current_page) {
1711   // Find all the matches in the current page.
1712   unsigned long flags = case_sensitive ? FPDF_MATCHCASE : 0;
1713   FPDF_SCHHANDLE find = FPDFText_FindStart(
1714       pages_[current_page]->GetTextPage(),
1715       reinterpret_cast<const unsigned short*>(term.c_str()),
1716       flags, character_to_start_searching_from);
1717
1718   // Note: since we search one page at a time, we don't find matches across
1719   // page boundaries.  We could do this manually ourself, but it seems low
1720   // priority since Reader itself doesn't do it.
1721   while (FPDFText_FindNext(find)) {
1722     PDFiumRange result(pages_[current_page],
1723                        FPDFText_GetSchResultIndex(find),
1724                        FPDFText_GetSchCount(find));
1725
1726     if (!first_search &&
1727         last_character_index_to_search_ != -1 &&
1728         result.page_index() == last_page_to_search_ &&
1729         result.char_index() >= last_character_index_to_search_) {
1730       break;
1731     }
1732
1733     AddFindResult(result);
1734   }
1735
1736   FPDFText_FindClose(find);
1737 }
1738
1739 void PDFiumEngine::SearchUsingICU(const base::string16& term,
1740                                   bool case_sensitive,
1741                                   bool first_search,
1742                                   int character_to_start_searching_from,
1743                                   int current_page) {
1744   base::string16 page_text;
1745   int text_length = pages_[current_page]->GetCharCount();
1746   if (character_to_start_searching_from) {
1747     text_length -= character_to_start_searching_from;
1748   } else if (!first_search &&
1749              last_character_index_to_search_ != -1 &&
1750              current_page == last_page_to_search_) {
1751     text_length = last_character_index_to_search_;
1752   }
1753   if (text_length <= 0)
1754     return;
1755   unsigned short* data =
1756       reinterpret_cast<unsigned short*>(WriteInto(&page_text, text_length + 1));
1757   FPDFText_GetText(pages_[current_page]->GetTextPage(),
1758                    character_to_start_searching_from,
1759                    text_length,
1760                    data);
1761   std::vector<PDFEngine::Client::SearchStringResult> results;
1762   client_->SearchString(
1763       page_text.c_str(), term.c_str(), case_sensitive, &results);
1764   for (size_t i = 0; i < results.size(); ++i) {
1765     // Need to map the indexes from the page text, which may have generated
1766     // characters like space etc, to character indices from the page.
1767     int temp_start = results[i].start_index + character_to_start_searching_from;
1768     int start = FPDFText_GetCharIndexFromTextIndex(
1769         pages_[current_page]->GetTextPage(), temp_start);
1770     int end = FPDFText_GetCharIndexFromTextIndex(
1771         pages_[current_page]->GetTextPage(),
1772         temp_start + results[i].length);
1773     AddFindResult(PDFiumRange(pages_[current_page], start, end - start));
1774   }
1775 }
1776
1777 void PDFiumEngine::AddFindResult(const PDFiumRange& result) {
1778   // Figure out where to insert the new location, since we could have
1779   // started searching midway and now we wrapped.
1780   size_t result_index;
1781   int page_index = result.page_index();
1782   int char_index = result.char_index();
1783   for (result_index = 0; result_index < find_results_.size(); ++result_index) {
1784     if (find_results_[result_index].page_index() > page_index ||
1785         (find_results_[result_index].page_index() == page_index &&
1786          find_results_[result_index].char_index() > char_index)) {
1787       break;
1788     }
1789   }
1790   find_results_.insert(find_results_.begin() + result_index, result);
1791   UpdateTickMarks();
1792
1793   if (current_find_index_.valid()) {
1794     if (result_index <= current_find_index_.GetIndex()) {
1795       // Update the current match index
1796       size_t find_index = current_find_index_.IncrementIndex();
1797       DCHECK_LT(find_index, find_results_.size());
1798       client_->NotifySelectedFindResultChanged(current_find_index_.GetIndex());
1799     }
1800   } else if (!resume_find_index_.valid()) {
1801     // Both indices are invalid. Select the first match.
1802     SelectFindResult(true);
1803   }
1804   client_->NotifyNumberOfFindResultsChanged(find_results_.size(), false);
1805 }
1806
1807 bool PDFiumEngine::SelectFindResult(bool forward) {
1808   if (find_results_.empty()) {
1809     NOTREACHED();
1810     return false;
1811   }
1812
1813   SelectionChangeInvalidator selection_invalidator(this);
1814
1815   // Move back/forward through the search locations we previously found.
1816   size_t new_index;
1817   const size_t last_index = find_results_.size() - 1;
1818   if (current_find_index_.valid()) {
1819     size_t current_index = current_find_index_.GetIndex();
1820     if (forward) {
1821       new_index = (current_index >= last_index) ?  0 : current_index + 1;
1822     } else {
1823       new_index = (current_find_index_.GetIndex() == 0) ?
1824           last_index : current_index - 1;
1825     }
1826   } else {
1827     new_index = forward ? 0 : last_index;
1828   }
1829   current_find_index_.SetIndex(new_index);
1830
1831   // Update the selection before telling the client to scroll, since it could
1832   // paint then.
1833   selection_.clear();
1834   selection_.push_back(find_results_[current_find_index_.GetIndex()]);
1835
1836   // If the result is not in view, scroll to it.
1837   pp::Rect bounding_rect;
1838   pp::Rect visible_rect = GetVisibleRect();
1839   // Use zoom of 1.0 since visible_rect is without zoom.
1840   std::vector<pp::Rect> rects;
1841   rects = find_results_[current_find_index_.GetIndex()].GetScreenRects(
1842       pp::Point(), 1.0, current_rotation_);
1843   for (size_t i = 0; i < rects.size(); ++i)
1844     bounding_rect = bounding_rect.Union(rects[i]);
1845   if (!visible_rect.Contains(bounding_rect)) {
1846     pp::Point center = bounding_rect.CenterPoint();
1847     // Make the page centered.
1848     int new_y = static_cast<int>(center.y() * current_zoom_) -
1849         static_cast<int>(visible_rect.height() * current_zoom_ / 2);
1850     if (new_y < 0)
1851       new_y = 0;
1852     client_->ScrollToY(new_y);
1853
1854     // Only move horizontally if it's not visible.
1855     if (center.x() < visible_rect.x() || center.x() > visible_rect.right()) {
1856       int new_x = static_cast<int>(center.x()  * current_zoom_) -
1857           static_cast<int>(visible_rect.width() * current_zoom_ / 2);
1858       if (new_x < 0)
1859         new_x = 0;
1860       client_->ScrollToX(new_x);
1861     }
1862   }
1863
1864   client_->NotifySelectedFindResultChanged(current_find_index_.GetIndex());
1865   return true;
1866 }
1867
1868 void PDFiumEngine::StopFind() {
1869   SelectionChangeInvalidator selection_invalidator(this);
1870
1871   selection_.clear();
1872   selecting_ = false;
1873   find_results_.clear();
1874   next_page_to_search_ = -1;
1875   last_page_to_search_ = -1;
1876   last_character_index_to_search_ = -1;
1877   current_find_index_.Invalidate();
1878   current_find_text_.clear();
1879   UpdateTickMarks();
1880   find_factory_.CancelAll();
1881 }
1882
1883 void PDFiumEngine::UpdateTickMarks() {
1884   std::vector<pp::Rect> tickmarks;
1885   for (size_t i = 0; i < find_results_.size(); ++i) {
1886     pp::Rect rect;
1887     // Always use an origin of 0,0 since scroll positions don't affect tickmark.
1888     std::vector<pp::Rect> rects = find_results_[i].GetScreenRects(
1889       pp::Point(0, 0), current_zoom_, current_rotation_);
1890     for (size_t j = 0; j < rects.size(); ++j)
1891       rect = rect.Union(rects[j]);
1892     tickmarks.push_back(rect);
1893   }
1894
1895   client_->UpdateTickMarks(tickmarks);
1896 }
1897
1898 void PDFiumEngine::ZoomUpdated(double new_zoom_level) {
1899   CancelPaints();
1900
1901   current_zoom_ = new_zoom_level;
1902
1903   CalculateVisiblePages();
1904   UpdateTickMarks();
1905 }
1906
1907 void PDFiumEngine::RotateClockwise() {
1908   current_rotation_ = (current_rotation_ + 1) % 4;
1909   RotateInternal();
1910 }
1911
1912 void PDFiumEngine::RotateCounterclockwise() {
1913   current_rotation_ = (current_rotation_ - 1) % 4;
1914   RotateInternal();
1915 }
1916
1917 void PDFiumEngine::InvalidateAllPages() {
1918   CancelPaints();
1919   StopFind();
1920   LoadPageInfo(true);
1921   client_->Invalidate(pp::Rect(plugin_size_));
1922 }
1923
1924 std::string PDFiumEngine::GetSelectedText() {
1925   base::string16 result;
1926   for (size_t i = 0; i < selection_.size(); ++i) {
1927     if (i > 0 &&
1928         selection_[i - 1].page_index() > selection_[i].page_index()) {
1929       result = selection_[i].GetText() + result;
1930     } else {
1931       result.append(selection_[i].GetText());
1932     }
1933   }
1934
1935   FormatStringWithHyphens(&result);
1936   FormatStringForOS(&result);
1937   return base::UTF16ToUTF8(result);
1938 }
1939
1940 std::string PDFiumEngine::GetLinkAtPosition(const pp::Point& point) {
1941   int temp;
1942   PDFiumPage::LinkTarget target;
1943   pp::Point point_in_page(
1944       static_cast<int>((point.x() + position_.x()) / current_zoom_),
1945       static_cast<int>((point.y() + position_.y()) / current_zoom_));
1946   PDFiumPage::Area area = GetCharIndex(point_in_page, &temp, &temp, &target);
1947   if (area == PDFiumPage::WEBLINK_AREA)
1948     return target.url;
1949   return std::string();
1950 }
1951
1952 bool PDFiumEngine::IsSelecting() {
1953   return selecting_;
1954 }
1955
1956 bool PDFiumEngine::HasPermission(DocumentPermission permission) const {
1957   switch (permission) {
1958     case PERMISSION_COPY:
1959       return (permissions_ & kPDFPermissionCopyMask) != 0;
1960     case PERMISSION_COPY_ACCESSIBLE:
1961       return (permissions_ & kPDFPermissionCopyAccessibleMask) != 0;
1962     case PERMISSION_PRINT_LOW_QUALITY:
1963       return (permissions_ & kPDFPermissionPrintLowQualityMask) != 0;
1964     case PERMISSION_PRINT_HIGH_QUALITY:
1965       return (permissions_ & kPDFPermissionPrintLowQualityMask) != 0 &&
1966              (permissions_ & kPDFPermissionPrintHighQualityMask) != 0;
1967     default:
1968       return true;
1969   };
1970 }
1971
1972 void PDFiumEngine::SelectAll() {
1973   SelectionChangeInvalidator selection_invalidator(this);
1974
1975   selection_.clear();
1976   for (size_t i = 0; i < pages_.size(); ++i)
1977     if (pages_[i]->available()) {
1978       selection_.push_back(PDFiumRange(pages_[i], 0,
1979                            pages_[i]->GetCharCount()));
1980     }
1981 }
1982
1983 int PDFiumEngine::GetNumberOfPages() {
1984   return pages_.size();
1985 }
1986
1987 int PDFiumEngine::GetNamedDestinationPage(const std::string& destination) {
1988   // Look for the destination.
1989   FPDF_DEST dest = FPDF_GetNamedDestByName(doc_, destination.c_str());
1990   if (!dest) {
1991     // Look for a bookmark with the same name.
1992     base::string16 destination_wide = base::UTF8ToUTF16(destination);
1993     FPDF_WIDESTRING destination_pdf_wide =
1994         reinterpret_cast<FPDF_WIDESTRING>(destination_wide.c_str());
1995     FPDF_BOOKMARK bookmark = FPDFBookmark_Find(doc_, destination_pdf_wide);
1996     if (!bookmark)
1997       return -1;
1998     dest = FPDFBookmark_GetDest(doc_, bookmark);
1999   }
2000   return dest ? FPDFDest_GetPageIndex(doc_, dest) : -1;
2001 }
2002
2003 int PDFiumEngine::GetFirstVisiblePage() {
2004   CalculateVisiblePages();
2005   return first_visible_page_;
2006 }
2007
2008 int PDFiumEngine::GetMostVisiblePage() {
2009   CalculateVisiblePages();
2010   return most_visible_page_;
2011 }
2012
2013 pp::Rect PDFiumEngine::GetPageRect(int index) {
2014   pp::Rect rc(pages_[index]->rect());
2015   rc.Inset(-kPageShadowLeft, -kPageShadowTop,
2016            -kPageShadowRight, -kPageShadowBottom);
2017   return rc;
2018 }
2019
2020 pp::Rect PDFiumEngine::GetPageContentsRect(int index) {
2021   return GetScreenRect(pages_[index]->rect());
2022 }
2023
2024 void PDFiumEngine::PaintThumbnail(pp::ImageData* image_data, int index) {
2025   FPDF_BITMAP bitmap = FPDFBitmap_CreateEx(
2026       image_data->size().width(), image_data->size().height(),
2027       FPDFBitmap_BGRx, image_data->data(), image_data->stride());
2028
2029   if (pages_[index]->available()) {
2030     FPDFBitmap_FillRect(bitmap, 0, 0, image_data->size().width(),
2031                         image_data->size().height(), 0xFFFFFFFF);
2032
2033     FPDF_RenderPageBitmap(
2034         bitmap, pages_[index]->GetPage(), 0, 0, image_data->size().width(),
2035         image_data->size().height(), 0, GetRenderingFlags());
2036   } else {
2037     FPDFBitmap_FillRect(bitmap, 0, 0, image_data->size().width(),
2038                         image_data->size().height(), kPendingPageColor);
2039   }
2040
2041   FPDFBitmap_Destroy(bitmap);
2042 }
2043
2044 void PDFiumEngine::SetGrayscale(bool grayscale) {
2045   render_grayscale_ = grayscale;
2046 }
2047
2048 void PDFiumEngine::OnCallback(int id) {
2049   if (!timers_.count(id))
2050     return;
2051
2052   timers_[id].second(id);
2053   if (timers_.count(id))  // The callback might delete the timer.
2054     client_->ScheduleCallback(id, timers_[id].first);
2055 }
2056
2057 std::string PDFiumEngine::GetPageAsJSON(int index) {
2058   if (!(HasPermission(PERMISSION_COPY) ||
2059         HasPermission(PERMISSION_COPY_ACCESSIBLE))) {
2060     return "{}";
2061   }
2062
2063   if (index < 0 || static_cast<size_t>(index) > pages_.size() - 1)
2064     return "{}";
2065
2066   scoped_ptr<base::Value> node(
2067       pages_[index]->GetAccessibleContentAsValue(current_rotation_));
2068   std::string page_json;
2069   base::JSONWriter::Write(node.get(), &page_json);
2070   return page_json;
2071 }
2072
2073 bool PDFiumEngine::GetPrintScaling() {
2074   return !!FPDF_VIEWERREF_GetPrintScaling(doc_);
2075 }
2076
2077 void PDFiumEngine::AppendBlankPages(int num_pages) {
2078   DCHECK(num_pages != 0);
2079
2080   if (!doc_)
2081     return;
2082
2083   selection_.clear();
2084   pending_pages_.clear();
2085
2086   // Delete all pages except the first one.
2087   while (pages_.size() > 1) {
2088     delete pages_.back();
2089     pages_.pop_back();
2090     FPDFPage_Delete(doc_, pages_.size());
2091   }
2092
2093   // Calculate document size and all page sizes.
2094   std::vector<pp::Rect> page_rects;
2095   pp::Size page_size = GetPageSize(0);
2096   page_size.Enlarge(kPageShadowLeft + kPageShadowRight,
2097                     kPageShadowTop + kPageShadowBottom);
2098   pp::Size old_document_size = document_size_;
2099   document_size_ = pp::Size(page_size.width(), 0);
2100   for (int i = 0; i < num_pages; ++i) {
2101     if (i != 0) {
2102       // Add space for horizontal separator.
2103       document_size_.Enlarge(0, kPageSeparatorThickness);
2104     }
2105
2106     pp::Rect rect(pp::Point(0, document_size_.height()), page_size);
2107     page_rects.push_back(rect);
2108
2109     document_size_.Enlarge(0, page_size.height());
2110   }
2111
2112   // Create blank pages.
2113   for (int i = 1; i < num_pages; ++i) {
2114     pp::Rect page_rect(page_rects[i]);
2115     page_rect.Inset(kPageShadowLeft, kPageShadowTop,
2116                     kPageShadowRight, kPageShadowBottom);
2117     double width_in_points =
2118         page_rect.width() * kPointsPerInch / kPixelsPerInch;
2119     double height_in_points =
2120         page_rect.height() * kPointsPerInch / kPixelsPerInch;
2121     FPDFPage_New(doc_, i, width_in_points, height_in_points);
2122     pages_.push_back(new PDFiumPage(this, i, page_rect, true));
2123   }
2124
2125   CalculateVisiblePages();
2126   if (document_size_ != old_document_size)
2127     client_->DocumentSizeUpdated(document_size_);
2128 }
2129
2130 void PDFiumEngine::LoadDocument() {
2131   // Check if the document is ready for loading. If it isn't just bail for now,
2132   // we will call LoadDocument() again later.
2133   if (!doc_ && !doc_loader_.IsDocumentComplete() &&
2134       !FPDFAvail_IsDocAvail(fpdf_availability_, &download_hints_)) {
2135     return;
2136   }
2137
2138   // If we're in the middle of getting a password, just return. We will retry
2139   // loading the document after we get the password anyway.
2140   if (getting_password_)
2141     return;
2142
2143   ScopedUnsupportedFeature scoped_unsupported_feature(this);
2144   bool needs_password = false;
2145   if (TryLoadingDoc(false, std::string(), &needs_password)) {
2146     ContinueLoadingDocument(false, std::string());
2147     return;
2148   }
2149   if (needs_password)
2150     GetPasswordAndLoad();
2151   else
2152     client_->DocumentLoadFailed();
2153 }
2154
2155 bool PDFiumEngine::TryLoadingDoc(bool with_password,
2156                                  const std::string& password,
2157                                  bool* needs_password) {
2158   *needs_password = false;
2159   if (doc_)
2160     return true;
2161
2162   const char* password_cstr = NULL;
2163   if (with_password) {
2164     password_cstr = password.c_str();
2165     password_tries_remaining_--;
2166   }
2167   if (doc_loader_.IsDocumentComplete())
2168     doc_ = FPDF_LoadCustomDocument(&file_access_, password_cstr);
2169   else
2170     doc_ = FPDFAvail_GetDocument(fpdf_availability_, password_cstr);
2171
2172   if (!doc_ && FPDF_GetLastError() == FPDF_ERR_PASSWORD)
2173     *needs_password = true;
2174
2175   return doc_ != NULL;
2176 }
2177
2178 void PDFiumEngine::GetPasswordAndLoad() {
2179   getting_password_ = true;
2180   DCHECK(!doc_ && FPDF_GetLastError() == FPDF_ERR_PASSWORD);
2181   client_->GetDocumentPassword(password_factory_.NewCallbackWithOutput(
2182       &PDFiumEngine::OnGetPasswordComplete));
2183 }
2184
2185 void PDFiumEngine::OnGetPasswordComplete(int32_t result,
2186                                          const pp::Var& password) {
2187   getting_password_ = false;
2188
2189   bool password_given = false;
2190   std::string password_text;
2191   if (result == PP_OK && password.is_string()) {
2192     password_text = password.AsString();
2193     if (!password_text.empty())
2194       password_given = true;
2195   }
2196   ContinueLoadingDocument(password_given, password_text);
2197 }
2198
2199 void PDFiumEngine::ContinueLoadingDocument(
2200     bool has_password,
2201     const std::string& password) {
2202   ScopedUnsupportedFeature scoped_unsupported_feature(this);
2203
2204   bool needs_password = false;
2205   bool loaded = TryLoadingDoc(has_password, password, &needs_password);
2206   bool password_incorrect = !loaded && has_password && needs_password;
2207   if (password_incorrect && password_tries_remaining_ > 0) {
2208     GetPasswordAndLoad();
2209     return;
2210   }
2211
2212   if (!doc_) {
2213     client_->DocumentLoadFailed();
2214     return;
2215   }
2216
2217   if (FPDFDoc_GetPageMode(doc_) == PAGEMODE_USEOUTLINES)
2218     client_->DocumentHasUnsupportedFeature("Bookmarks");
2219
2220   permissions_ = FPDF_GetDocPermissions(doc_);
2221
2222   if (!form_) {
2223     // Only returns 0 when data isn't available.  If form data is downloaded, or
2224     // if this isn't a form, returns positive values.
2225     if (!doc_loader_.IsDocumentComplete() &&
2226         !FPDFAvail_IsFormAvail(fpdf_availability_, &download_hints_)) {
2227       return;
2228     }
2229
2230     form_ = FPDFDOC_InitFormFillEnviroument(
2231         doc_, static_cast<FPDF_FORMFILLINFO*>(this));
2232     FPDF_SetFormFieldHighlightColor(form_, 0, kFormHighlightColor);
2233     FPDF_SetFormFieldHighlightAlpha(form_, kFormHighlightAlpha);
2234   }
2235
2236   if (!doc_loader_.IsDocumentComplete()) {
2237     // Check if the first page is available.  In a linearized PDF, that is not
2238     // always page 0.  Doing this gives us the default page size, since when the
2239     // document is available, the first page is available as well.
2240     CheckPageAvailable(FPDFAvail_GetFirstPageNum(doc_), &pending_pages_);
2241   }
2242
2243   LoadPageInfo(false);
2244
2245   if (doc_loader_.IsDocumentComplete())
2246     FinishLoadingDocument();
2247 }
2248
2249 void PDFiumEngine::LoadPageInfo(bool reload) {
2250   pending_pages_.clear();
2251   pp::Size old_document_size = document_size_;
2252   document_size_ = pp::Size();
2253   std::vector<pp::Rect> page_rects;
2254   int page_count = FPDF_GetPageCount(doc_);
2255   bool doc_complete = doc_loader_.IsDocumentComplete();
2256   for (int i = 0; i < page_count; ++i) {
2257     if (i != 0) {
2258       // Add space for horizontal separator.
2259       document_size_.Enlarge(0, kPageSeparatorThickness);
2260     }
2261
2262     // Get page availability. If reload==false, and document is not loaded yet
2263     // (we are using async loading) - mark all pages as unavailable.
2264     // If reload==true (we have document constructed already), get page
2265     // availability flag from already existing PDFiumPage class.
2266     bool page_available = reload ? pages_[i]->available() : doc_complete;
2267
2268     pp::Size size = page_available ? GetPageSize(i) : default_page_size_;
2269     size.Enlarge(kPageShadowLeft + kPageShadowRight,
2270                  kPageShadowTop + kPageShadowBottom);
2271     pp::Rect rect(pp::Point(0, document_size_.height()), size);
2272     page_rects.push_back(rect);
2273
2274     if (size.width() > document_size_.width())
2275       document_size_.set_width(size.width());
2276
2277     document_size_.Enlarge(0, size.height());
2278   }
2279
2280   for (int i = 0; i < page_count; ++i) {
2281     // Center pages relative to the entire document.
2282     page_rects[i].set_x((document_size_.width() - page_rects[i].width()) / 2);
2283     pp::Rect page_rect(page_rects[i]);
2284     page_rect.Inset(kPageShadowLeft, kPageShadowTop,
2285                     kPageShadowRight, kPageShadowBottom);
2286     if (reload) {
2287       pages_[i]->set_rect(page_rect);
2288     } else {
2289       pages_.push_back(new PDFiumPage(this, i, page_rect, doc_complete));
2290     }
2291   }
2292
2293   CalculateVisiblePages();
2294   if (document_size_ != old_document_size)
2295     client_->DocumentSizeUpdated(document_size_);
2296 }
2297
2298 void PDFiumEngine::CalculateVisiblePages() {
2299   // Clear pending requests queue, since it may contain requests to the pages
2300   // that are already invisible (after scrolling for example).
2301   pending_pages_.clear();
2302   doc_loader_.ClearPendingRequests();
2303
2304   visible_pages_.clear();
2305   pp::Rect visible_rect(plugin_size_);
2306   for (size_t i = 0; i < pages_.size(); ++i) {
2307     // Check an entire PageScreenRect, since we might need to repaint side
2308     // borders and shadows even if the page itself is not visible.
2309     // For example, when user use pdf with different page sizes and zoomed in
2310     // outside page area.
2311     if (visible_rect.Intersects(GetPageScreenRect(i))) {
2312       visible_pages_.push_back(i);
2313       CheckPageAvailable(i, &pending_pages_);
2314     } else {
2315       // Need to unload pages when we're not using them, since some PDFs use a
2316       // lot of memory.  See http://crbug.com/48791
2317       if (defer_page_unload_) {
2318         deferred_page_unloads_.push_back(i);
2319       } else {
2320         pages_[i]->Unload();
2321       }
2322
2323       // If the last mouse down was on a page that's no longer visible, reset
2324       // that variable so that we don't send keyboard events to it (the focus
2325       // will be lost when the page is first closed anyways).
2326       if (static_cast<int>(i) == last_page_mouse_down_)
2327         last_page_mouse_down_ = -1;
2328     }
2329   }
2330
2331   // Any pending highlighting of form fields will be invalid since these are in
2332   // screen coordinates.
2333   form_highlights_.clear();
2334
2335   if (visible_pages_.size() == 0)
2336     first_visible_page_ = -1;
2337   else
2338     first_visible_page_ = visible_pages_.front();
2339
2340   int most_visible_page = first_visible_page_;
2341   // Check if the next page is more visible than the first one.
2342   if (most_visible_page != -1 &&
2343       pages_.size() > 0 &&
2344       most_visible_page < static_cast<int>(pages_.size()) - 1) {
2345     pp::Rect rc_first =
2346         visible_rect.Intersect(GetPageScreenRect(most_visible_page));
2347     pp::Rect rc_next =
2348         visible_rect.Intersect(GetPageScreenRect(most_visible_page + 1));
2349     if (rc_next.height() > rc_first.height())
2350       most_visible_page++;
2351   }
2352
2353   SetCurrentPage(most_visible_page);
2354 }
2355
2356 bool PDFiumEngine::IsPageVisible(int index) const {
2357   for (size_t i = 0; i < visible_pages_.size(); ++i) {
2358     if (visible_pages_[i] == index)
2359       return true;
2360   }
2361
2362   return false;
2363 }
2364
2365 bool PDFiumEngine::CheckPageAvailable(int index, std::vector<int>* pending) {
2366   if (!doc_ || !form_)
2367     return false;
2368
2369   if (static_cast<int>(pages_.size()) > index && pages_[index]->available())
2370     return true;
2371
2372   if (!FPDFAvail_IsPageAvail(fpdf_availability_, index, &download_hints_)) {
2373     size_t j;
2374     for (j = 0; j < pending->size(); ++j) {
2375       if ((*pending)[j] == index)
2376         break;
2377     }
2378
2379     if (j == pending->size())
2380       pending->push_back(index);
2381     return false;
2382   }
2383
2384   if (static_cast<int>(pages_.size()) > index)
2385     pages_[index]->set_available(true);
2386   if (!default_page_size_.GetArea())
2387     default_page_size_ = GetPageSize(index);
2388   return true;
2389 }
2390
2391 pp::Size PDFiumEngine::GetPageSize(int index) {
2392   pp::Size size;
2393   double width_in_points = 0;
2394   double height_in_points = 0;
2395   int rv = FPDF_GetPageSizeByIndex(
2396       doc_, index, &width_in_points, &height_in_points);
2397
2398   if (rv) {
2399     int width_in_pixels = static_cast<int>(
2400         width_in_points * kPixelsPerInch / kPointsPerInch);
2401     int height_in_pixels = static_cast<int>(
2402         height_in_points * kPixelsPerInch / kPointsPerInch);
2403     if (current_rotation_ % 2 == 1)
2404       std::swap(width_in_pixels, height_in_pixels);
2405     size = pp::Size(width_in_pixels, height_in_pixels);
2406   }
2407   return size;
2408 }
2409
2410 int PDFiumEngine::StartPaint(int page_index, const pp::Rect& dirty) {
2411   // For the first time we hit paint, do nothing and just record the paint for
2412   // the next callback.  This keeps the UI responsive in case the user is doing
2413   // a lot of scrolling.
2414   ProgressivePaint progressive;
2415   progressive.rect = dirty;
2416   progressive.page_index = page_index;
2417   progressive.bitmap = NULL;
2418   progressive.painted_ = false;
2419   progressive_paints_.push_back(progressive);
2420   return progressive_paints_.size() - 1;
2421 }
2422
2423 bool PDFiumEngine::ContinuePaint(int progressive_index,
2424                                  pp::ImageData* image_data) {
2425 #if defined(OS_LINUX)
2426   g_last_instance_id = client_->GetPluginInstance()->pp_instance();
2427 #endif
2428
2429   int rv;
2430   int page_index = progressive_paints_[progressive_index].page_index;
2431   last_progressive_start_time_ = base::Time::Now();
2432   if (progressive_paints_[progressive_index].bitmap) {
2433     rv = FPDF_RenderPage_Continue(
2434         pages_[page_index]->GetPage(), static_cast<IFSDK_PAUSE*>(this));
2435   } else {
2436     pp::Rect dirty = progressive_paints_[progressive_index].rect;
2437     progressive_paints_[progressive_index].bitmap = CreateBitmap(dirty,
2438                                                                  image_data);
2439     int start_x, start_y, size_x, size_y;
2440     GetPDFiumRect(
2441         page_index, dirty, &start_x, &start_y, &size_x, &size_y);
2442     FPDFBitmap_FillRect(progressive_paints_[progressive_index].bitmap, start_x,
2443                         start_y, size_x, size_y, 0xFFFFFFFF);
2444     rv = FPDF_RenderPageBitmap_Start(
2445         progressive_paints_[progressive_index].bitmap,
2446         pages_[page_index]->GetPage(), start_x, start_y, size_x, size_y,
2447         current_rotation_,
2448         GetRenderingFlags(), static_cast<IFSDK_PAUSE*>(this));
2449   }
2450   return rv != FPDF_RENDER_TOBECOUNTINUED;
2451 }
2452
2453 void PDFiumEngine::FinishPaint(int progressive_index,
2454                                pp::ImageData* image_data) {
2455   int page_index = progressive_paints_[progressive_index].page_index;
2456   pp::Rect dirty_in_screen = progressive_paints_[progressive_index].rect;
2457   FPDF_BITMAP bitmap = progressive_paints_[progressive_index].bitmap;
2458   int start_x, start_y, size_x, size_y;
2459   GetPDFiumRect(
2460       page_index, dirty_in_screen, &start_x, &start_y, &size_x, &size_y);
2461
2462   // Draw the forms.
2463   FPDF_FFLDraw(
2464       form_, bitmap, pages_[page_index]->GetPage(), start_x, start_y, size_x,
2465       size_y, current_rotation_, GetRenderingFlags());
2466
2467   FillPageSides(progressive_index);
2468
2469   // Paint the page shadows.
2470   PaintPageShadow(progressive_index, image_data);
2471
2472   DrawSelections(progressive_index, image_data);
2473
2474   FPDF_RenderPage_Close(pages_[page_index]->GetPage());
2475   FPDFBitmap_Destroy(bitmap);
2476   progressive_paints_.erase(progressive_paints_.begin() + progressive_index);
2477
2478   client_->DocumentPaintOccurred();
2479 }
2480
2481 void PDFiumEngine::CancelPaints() {
2482   for (size_t i = 0; i < progressive_paints_.size(); ++i) {
2483     FPDF_RenderPage_Close(pages_[progressive_paints_[i].page_index]->GetPage());
2484     FPDFBitmap_Destroy(progressive_paints_[i].bitmap);
2485   }
2486   progressive_paints_.clear();
2487 }
2488
2489 void PDFiumEngine::FillPageSides(int progressive_index) {
2490   int page_index = progressive_paints_[progressive_index].page_index;
2491   pp::Rect dirty_in_screen = progressive_paints_[progressive_index].rect;
2492   FPDF_BITMAP bitmap = progressive_paints_[progressive_index].bitmap;
2493
2494   pp::Rect page_rect = pages_[page_index]->rect();
2495   if (page_rect.x() > 0) {
2496     pp::Rect left(0,
2497                   page_rect.y() - kPageShadowTop,
2498                   page_rect.x() - kPageShadowLeft,
2499                   page_rect.height() + kPageShadowTop +
2500                       kPageShadowBottom + kPageSeparatorThickness);
2501     left = GetScreenRect(left).Intersect(dirty_in_screen);
2502
2503     FPDFBitmap_FillRect(bitmap, left.x() - dirty_in_screen.x(),
2504                         left.y() - dirty_in_screen.y(), left.width(),
2505                         left.height(), kBackgroundColor);
2506   }
2507
2508   if (page_rect.right() < document_size_.width()) {
2509     pp::Rect right(page_rect.right() + kPageShadowRight,
2510                    page_rect.y() - kPageShadowTop,
2511                    document_size_.width() - page_rect.right() -
2512                       kPageShadowRight,
2513                    page_rect.height() + kPageShadowTop +
2514                        kPageShadowBottom + kPageSeparatorThickness);
2515     right = GetScreenRect(right).Intersect(dirty_in_screen);
2516
2517     FPDFBitmap_FillRect(bitmap, right.x() - dirty_in_screen.x(),
2518                         right.y() - dirty_in_screen.y(), right.width(),
2519                         right.height(), kBackgroundColor);
2520   }
2521
2522   // Paint separator.
2523   pp::Rect bottom(page_rect.x() - kPageShadowLeft,
2524                   page_rect.bottom() + kPageShadowBottom,
2525                   page_rect.width() + kPageShadowLeft + kPageShadowRight,
2526                   kPageSeparatorThickness);
2527   bottom = GetScreenRect(bottom).Intersect(dirty_in_screen);
2528
2529   FPDFBitmap_FillRect(bitmap, bottom.x() - dirty_in_screen.x(),
2530                       bottom.y() - dirty_in_screen.y(), bottom.width(),
2531                       bottom.height(), kBackgroundColor);
2532 }
2533
2534 void PDFiumEngine::PaintPageShadow(int progressive_index,
2535                                    pp::ImageData* image_data) {
2536   int page_index = progressive_paints_[progressive_index].page_index;
2537   pp::Rect dirty_in_screen = progressive_paints_[progressive_index].rect;
2538   pp::Rect page_rect = pages_[page_index]->rect();
2539   pp::Rect shadow_rect(page_rect);
2540   shadow_rect.Inset(-kPageShadowLeft, -kPageShadowTop,
2541                     -kPageShadowRight, -kPageShadowBottom);
2542
2543   // Due to the rounding errors of the GetScreenRect it is possible to get
2544   // different size shadows on the left and right sides even they are defined
2545   // the same. To fix this issue let's calculate shadow rect and then shrink
2546   // it by the size of the shadows.
2547   shadow_rect = GetScreenRect(shadow_rect);
2548   page_rect = shadow_rect;
2549
2550   page_rect.Inset(static_cast<int>(ceil(kPageShadowLeft * current_zoom_)),
2551                   static_cast<int>(ceil(kPageShadowTop * current_zoom_)),
2552                   static_cast<int>(ceil(kPageShadowRight * current_zoom_)),
2553                   static_cast<int>(ceil(kPageShadowBottom * current_zoom_)));
2554
2555   DrawPageShadow(page_rect, shadow_rect, dirty_in_screen, image_data);
2556 }
2557
2558 void PDFiumEngine::DrawSelections(int progressive_index,
2559                                   pp::ImageData* image_data) {
2560   int page_index = progressive_paints_[progressive_index].page_index;
2561   pp::Rect dirty_in_screen = progressive_paints_[progressive_index].rect;
2562
2563   void* region = NULL;
2564   int stride;
2565   GetRegion(dirty_in_screen.point(), image_data, &region, &stride);
2566
2567   std::vector<pp::Rect> highlighted_rects;
2568   pp::Rect visible_rect = GetVisibleRect();
2569   for (size_t k = 0; k < selection_.size(); ++k) {
2570     if (selection_[k].page_index() != page_index)
2571       continue;
2572     std::vector<pp::Rect> rects = selection_[k].GetScreenRects(
2573         visible_rect.point(), current_zoom_, current_rotation_);
2574     for (size_t j = 0; j < rects.size(); ++j) {
2575       pp::Rect visible_selection = rects[j].Intersect(dirty_in_screen);
2576       if (visible_selection.IsEmpty())
2577         continue;
2578
2579       visible_selection.Offset(
2580           -dirty_in_screen.point().x(), -dirty_in_screen.point().y());
2581       Highlight(region, stride, visible_selection, &highlighted_rects);
2582     }
2583   }
2584
2585   for (size_t k = 0; k < form_highlights_.size(); ++k) {
2586     pp::Rect visible_selection = form_highlights_[k].Intersect(dirty_in_screen);
2587       if (visible_selection.IsEmpty())
2588         continue;
2589
2590     visible_selection.Offset(
2591         -dirty_in_screen.point().x(), -dirty_in_screen.point().y());
2592     Highlight(region, stride, visible_selection, &highlighted_rects);
2593   }
2594   form_highlights_.clear();
2595 }
2596
2597 void PDFiumEngine::PaintUnavailablePage(int page_index,
2598                                         const pp::Rect& dirty,
2599                                         pp::ImageData* image_data) {
2600   int start_x, start_y, size_x, size_y;
2601   GetPDFiumRect(page_index, dirty, &start_x, &start_y, &size_x, &size_y);
2602   FPDF_BITMAP bitmap = CreateBitmap(dirty, image_data);
2603   FPDFBitmap_FillRect(bitmap, start_x, start_y, size_x, size_y,
2604                       kPendingPageColor);
2605
2606   pp::Rect loading_text_in_screen(
2607       pages_[page_index]->rect().width() / 2,
2608       pages_[page_index]->rect().y() + kLoadingTextVerticalOffset, 0, 0);
2609   loading_text_in_screen = GetScreenRect(loading_text_in_screen);
2610   FPDFBitmap_Destroy(bitmap);
2611 }
2612
2613 int PDFiumEngine::GetProgressiveIndex(int page_index) const {
2614   for (size_t i = 0; i < progressive_paints_.size(); ++i) {
2615     if (progressive_paints_[i].page_index == page_index)
2616       return i;
2617   }
2618   return -1;
2619 }
2620
2621 FPDF_BITMAP PDFiumEngine::CreateBitmap(const pp::Rect& rect,
2622                                        pp::ImageData* image_data) const {
2623   void* region;
2624   int stride;
2625   GetRegion(rect.point(), image_data, &region, &stride);
2626   if (!region)
2627     return NULL;
2628   return FPDFBitmap_CreateEx(
2629       rect.width(), rect.height(), FPDFBitmap_BGRx, region, stride);
2630 }
2631
2632 void PDFiumEngine::GetPDFiumRect(
2633     int page_index, const pp::Rect& rect, int* start_x, int* start_y,
2634     int* size_x, int* size_y) const {
2635   pp::Rect page_rect = GetScreenRect(pages_[page_index]->rect());
2636   page_rect.Offset(-rect.x(), -rect.y());
2637
2638   *start_x = page_rect.x();
2639   *start_y = page_rect.y();
2640   *size_x = page_rect.width();
2641   *size_y = page_rect.height();
2642 }
2643
2644 int PDFiumEngine::GetRenderingFlags() const {
2645   int flags = FPDF_LCD_TEXT | FPDF_NO_CATCH;
2646   if (render_grayscale_)
2647     flags |= FPDF_GRAYSCALE;
2648   if (client_->IsPrintPreview())
2649     flags |= FPDF_PRINTING;
2650   return flags;
2651 }
2652
2653 pp::Rect PDFiumEngine::GetVisibleRect() const {
2654   pp::Rect rv;
2655   rv.set_x(static_cast<int>(position_.x() / current_zoom_));
2656   rv.set_y(static_cast<int>(position_.y() / current_zoom_));
2657   rv.set_width(static_cast<int>(ceil(plugin_size_.width() / current_zoom_)));
2658   rv.set_height(static_cast<int>(ceil(plugin_size_.height() / current_zoom_)));
2659   return rv;
2660 }
2661
2662 pp::Rect PDFiumEngine::GetPageScreenRect(int page_index) const {
2663   // Since we use this rect for creating the PDFium bitmap, also include other
2664   // areas around the page that we might need to update such as the page
2665   // separator and the sides if the page is narrower than the document.
2666   return GetScreenRect(pp::Rect(
2667       0,
2668       pages_[page_index]->rect().y() - kPageShadowTop,
2669       document_size_.width(),
2670       pages_[page_index]->rect().height() + kPageShadowTop +
2671           kPageShadowBottom + kPageSeparatorThickness));
2672 }
2673
2674 pp::Rect PDFiumEngine::GetScreenRect(const pp::Rect& rect) const {
2675   pp::Rect rv;
2676   int right =
2677       static_cast<int>(ceil(rect.right() * current_zoom_ - position_.x()));
2678   int bottom =
2679     static_cast<int>(ceil(rect.bottom() * current_zoom_ - position_.y()));
2680
2681   rv.set_x(static_cast<int>(rect.x() * current_zoom_ - position_.x()));
2682   rv.set_y(static_cast<int>(rect.y() * current_zoom_ - position_.y()));
2683   rv.set_width(right - rv.x());
2684   rv.set_height(bottom - rv.y());
2685   return rv;
2686 }
2687
2688 void PDFiumEngine::Highlight(void* buffer,
2689                              int stride,
2690                              const pp::Rect& rect,
2691                              std::vector<pp::Rect>* highlighted_rects) {
2692   if (!buffer)
2693     return;
2694
2695   pp::Rect new_rect = rect;
2696   for (size_t i = 0; i < highlighted_rects->size(); ++i)
2697     new_rect = new_rect.Subtract((*highlighted_rects)[i]);
2698
2699   highlighted_rects->push_back(new_rect);
2700   int l = new_rect.x();
2701   int t = new_rect.y();
2702   int w = new_rect.width();
2703   int h = new_rect.height();
2704
2705   for (int y = t; y < t + h; ++y) {
2706     for (int x = l; x < l + w; ++x) {
2707       uint8* pixel = static_cast<uint8*>(buffer) + y * stride + x * 4;
2708       //  This is our highlight color.
2709       pixel[0] = static_cast<uint8>(
2710           pixel[0] * (kHighlightColorB / 255.0));
2711       pixel[1] = static_cast<uint8>(
2712           pixel[1] * (kHighlightColorG / 255.0));
2713       pixel[2] = static_cast<uint8>(
2714           pixel[2] * (kHighlightColorR / 255.0));
2715     }
2716   }
2717 }
2718
2719 PDFiumEngine::SelectionChangeInvalidator::SelectionChangeInvalidator(
2720     PDFiumEngine* engine) : engine_(engine) {
2721   previous_origin_ = engine_->GetVisibleRect().point();
2722   GetVisibleSelectionsScreenRects(&old_selections_);
2723 }
2724
2725 PDFiumEngine::SelectionChangeInvalidator::~SelectionChangeInvalidator() {
2726   // Offset the old selections if the document scrolled since we recorded them.
2727   pp::Point offset = previous_origin_ - engine_->GetVisibleRect().point();
2728   for (size_t i = 0; i < old_selections_.size(); ++i)
2729     old_selections_[i].Offset(offset);
2730
2731   std::vector<pp::Rect> new_selections;
2732   GetVisibleSelectionsScreenRects(&new_selections);
2733   for (size_t i = 0; i < new_selections.size(); ++i) {
2734     for (size_t j = 0; j < old_selections_.size(); ++j) {
2735       if (!old_selections_[j].IsEmpty() &&
2736           new_selections[i] == old_selections_[j]) {
2737         // Rectangle was selected before and after, so no need to invalidate it.
2738         // Mark the rectangles by setting them to empty.
2739         new_selections[i] = old_selections_[j] = pp::Rect();
2740         break;
2741       }
2742     }
2743   }
2744
2745   for (size_t i = 0; i < old_selections_.size(); ++i) {
2746     if (!old_selections_[i].IsEmpty())
2747       engine_->client_->Invalidate(old_selections_[i]);
2748   }
2749   for (size_t i = 0; i < new_selections.size(); ++i) {
2750     if (!new_selections[i].IsEmpty())
2751       engine_->client_->Invalidate(new_selections[i]);
2752   }
2753   engine_->OnSelectionChanged();
2754 }
2755
2756 void
2757 PDFiumEngine::SelectionChangeInvalidator::GetVisibleSelectionsScreenRects(
2758     std::vector<pp::Rect>* rects) {
2759   pp::Rect visible_rect = engine_->GetVisibleRect();
2760   for (size_t i = 0; i < engine_->selection_.size(); ++i) {
2761     int page_index = engine_->selection_[i].page_index();
2762     if (!engine_->IsPageVisible(page_index))
2763       continue;  // This selection is on a page that's not currently visible.
2764
2765     std::vector<pp::Rect> selection_rects =
2766         engine_->selection_[i].GetScreenRects(
2767             visible_rect.point(),
2768             engine_->current_zoom_,
2769             engine_->current_rotation_);
2770     rects->insert(rects->end(), selection_rects.begin(), selection_rects.end());
2771   }
2772 }
2773
2774 PDFiumEngine::MouseDownState::MouseDownState(
2775     const PDFiumPage::Area& area,
2776     const PDFiumPage::LinkTarget& target)
2777     : area_(area), target_(target) {
2778 }
2779
2780 PDFiumEngine::MouseDownState::~MouseDownState() {
2781 }
2782
2783 void PDFiumEngine::MouseDownState::Set(const PDFiumPage::Area& area,
2784                                        const PDFiumPage::LinkTarget& target) {
2785   area_ = area;
2786   target_ = target;
2787 }
2788
2789 void PDFiumEngine::MouseDownState::Reset() {
2790   area_ = PDFiumPage::NONSELECTABLE_AREA;
2791   target_ = PDFiumPage::LinkTarget();
2792 }
2793
2794 bool PDFiumEngine::MouseDownState::Matches(
2795     const PDFiumPage::Area& area,
2796     const PDFiumPage::LinkTarget& target) const {
2797   if (area_ == area) {
2798     if (area == PDFiumPage::WEBLINK_AREA)
2799       return target_.url == target.url;
2800     if (area == PDFiumPage::DOCLINK_AREA)
2801       return target_.page == target.page;
2802     return true;
2803   }
2804   return false;
2805 }
2806
2807 PDFiumEngine::FindTextIndex::FindTextIndex()
2808     : valid_(false), index_(0) {
2809 }
2810
2811 PDFiumEngine::FindTextIndex::~FindTextIndex() {
2812 }
2813
2814 void PDFiumEngine::FindTextIndex::Invalidate() {
2815   valid_ = false;
2816 }
2817
2818 size_t PDFiumEngine::FindTextIndex::GetIndex() const {
2819   DCHECK(valid_);
2820   return index_;
2821 }
2822
2823 void PDFiumEngine::FindTextIndex::SetIndex(size_t index) {
2824   valid_ = true;
2825   index_ = index;
2826 }
2827
2828 size_t PDFiumEngine::FindTextIndex::IncrementIndex() {
2829   DCHECK(valid_);
2830   return ++index_;
2831 }
2832
2833 void PDFiumEngine::DeviceToPage(int page_index,
2834                                 float device_x,
2835                                 float device_y,
2836                                 double* page_x,
2837                                 double* page_y) {
2838   *page_x = *page_y = 0;
2839   int temp_x = static_cast<int>((device_x + position_.x())/ current_zoom_ -
2840       pages_[page_index]->rect().x());
2841   int temp_y = static_cast<int>((device_y + position_.y())/ current_zoom_ -
2842       pages_[page_index]->rect().y());
2843   FPDF_DeviceToPage(
2844       pages_[page_index]->GetPage(), 0, 0,
2845       pages_[page_index]->rect().width(),  pages_[page_index]->rect().height(),
2846       current_rotation_, temp_x, temp_y, page_x, page_y);
2847 }
2848
2849 int PDFiumEngine::GetVisiblePageIndex(FPDF_PAGE page) {
2850   for (size_t i = 0; i < visible_pages_.size(); ++i) {
2851     if (pages_[visible_pages_[i]]->GetPage() == page)
2852       return visible_pages_[i];
2853   }
2854   return -1;
2855 }
2856
2857 void PDFiumEngine::SetCurrentPage(int index) {
2858   if (index == most_visible_page_ || !form_)
2859     return;
2860   if (most_visible_page_ != -1 && called_do_document_action_) {
2861     FPDF_PAGE old_page = pages_[most_visible_page_]->GetPage();
2862     FORM_DoPageAAction(old_page, form_, FPDFPAGE_AACTION_CLOSE);
2863   }
2864   most_visible_page_ = index;
2865 #if defined(OS_LINUX)
2866     g_last_instance_id = client_->GetPluginInstance()->pp_instance();
2867 #endif
2868   if (most_visible_page_ != -1 && called_do_document_action_) {
2869     FPDF_PAGE new_page = pages_[most_visible_page_]->GetPage();
2870     FORM_DoPageAAction(new_page, form_, FPDFPAGE_AACTION_OPEN);
2871   }
2872 }
2873
2874 void PDFiumEngine::TransformPDFPageForPrinting(
2875     FPDF_PAGE page,
2876     const PP_PrintSettings_Dev& print_settings) {
2877   // Get the source page width and height in points.
2878   const double src_page_width = FPDF_GetPageWidth(page);
2879   const double src_page_height = FPDF_GetPageHeight(page);
2880
2881   const int src_page_rotation = FPDFPage_GetRotation(page);
2882   const bool fit_to_page = print_settings.print_scaling_option ==
2883       PP_PRINTSCALINGOPTION_FIT_TO_PRINTABLE_AREA;
2884
2885   pp::Size page_size(print_settings.paper_size);
2886   pp::Rect content_rect(print_settings.printable_area);
2887   const bool rotated = (src_page_rotation % 2 == 1);
2888   SetPageSizeAndContentRect(rotated,
2889                             src_page_width > src_page_height,
2890                             &page_size,
2891                             &content_rect);
2892
2893   // Compute the screen page width and height in points.
2894   const int actual_page_width =
2895       rotated ? page_size.height() : page_size.width();
2896   const int actual_page_height =
2897       rotated ? page_size.width() : page_size.height();
2898
2899   const double scale_factor = CalculateScaleFactor(fit_to_page, content_rect,
2900                                                    src_page_width,
2901                                                    src_page_height, rotated);
2902
2903   // Calculate positions for the clip box.
2904   ClipBox source_clip_box;
2905   CalculateClipBoxBoundary(page, scale_factor, rotated, &source_clip_box);
2906
2907   // Calculate the translation offset values.
2908   double offset_x = 0;
2909   double offset_y = 0;
2910   if (fit_to_page) {
2911     CalculateScaledClipBoxOffset(content_rect, source_clip_box, &offset_x,
2912                                  &offset_y);
2913   } else {
2914     CalculateNonScaledClipBoxOffset(content_rect, src_page_rotation,
2915                                     actual_page_width, actual_page_height,
2916                                     source_clip_box, &offset_x, &offset_y);
2917   }
2918
2919   // Reset the media box and crop box. When the page has crop box and media box,
2920   // the plugin will display the crop box contents and not the entire media box.
2921   // If the pages have different crop box values, the plugin will display a
2922   // document of multiple page sizes. To give better user experience, we
2923   // decided to have same crop box and media box values. Hence, the user will
2924   // see a list of uniform pages.
2925   FPDFPage_SetMediaBox(page, 0, 0, page_size.width(), page_size.height());
2926   FPDFPage_SetCropBox(page, 0, 0, page_size.width(), page_size.height());
2927
2928   // Transformation is not required, return. Do this check only after updating
2929   // the media box and crop box. For more detailed information, please refer to
2930   // the comment block right before FPDF_SetMediaBox and FPDF_GetMediaBox calls.
2931   if (scale_factor == 1.0 && offset_x == 0 && offset_y == 0)
2932     return;
2933
2934
2935   // All the positions have been calculated, now manipulate the PDF.
2936   FS_MATRIX matrix = {static_cast<float>(scale_factor),
2937                       0,
2938                       0,
2939                       static_cast<float>(scale_factor),
2940                       static_cast<float>(offset_x),
2941                       static_cast<float>(offset_y)};
2942   FS_RECTF cliprect = {static_cast<float>(source_clip_box.left+offset_x),
2943                        static_cast<float>(source_clip_box.top+offset_y),
2944                        static_cast<float>(source_clip_box.right+offset_x),
2945                        static_cast<float>(source_clip_box.bottom+offset_y)};
2946   FPDFPage_TransFormWithClip(page, &matrix, &cliprect);
2947   FPDFPage_TransformAnnots(page, scale_factor, 0, 0, scale_factor,
2948                            offset_x, offset_y);
2949 }
2950
2951 void PDFiumEngine::DrawPageShadow(const pp::Rect& page_rc,
2952                                   const pp::Rect& shadow_rc,
2953                                   const pp::Rect& clip_rc,
2954                                   pp::ImageData* image_data) {
2955   pp::Rect page_rect(page_rc);
2956   page_rect.Offset(page_offset_);
2957
2958   pp::Rect shadow_rect(shadow_rc);
2959   shadow_rect.Offset(page_offset_);
2960
2961   pp::Rect clip_rect(clip_rc);
2962   clip_rect.Offset(page_offset_);
2963
2964   // Page drop shadow parameters.
2965   const double factor = 0.5;
2966   uint32 depth = std::max(
2967       std::max(page_rect.x() - shadow_rect.x(),
2968                page_rect.y() - shadow_rect.y()),
2969       std::max(shadow_rect.right() - page_rect.right(),
2970                shadow_rect.bottom() - page_rect.bottom()));
2971   depth = static_cast<uint32>(depth * 1.5) + 1;
2972
2973   // We need to check depth only to verify our copy of shadow matrix is correct.
2974   if (!page_shadow_.get() || page_shadow_->depth() != depth)
2975     page_shadow_.reset(new ShadowMatrix(depth, factor, kBackgroundColor));
2976
2977   DCHECK(!image_data->is_null());
2978   DrawShadow(image_data, shadow_rect, page_rect, clip_rect, *page_shadow_);
2979 }
2980
2981 void PDFiumEngine::GetRegion(const pp::Point& location,
2982                              pp::ImageData* image_data,
2983                              void** region,
2984                              int* stride) const {
2985   if (image_data->is_null()) {
2986     DCHECK(plugin_size_.IsEmpty());
2987     *stride = 0;
2988     *region = NULL;
2989     return;
2990   }
2991   char* buffer = static_cast<char*>(image_data->data());
2992   *stride = image_data->stride();
2993
2994   pp::Point offset_location = location + page_offset_;
2995   // TODO: update this when we support BIDI and scrollbars can be on the left.
2996   if (!buffer ||
2997       !pp::Rect(page_offset_, plugin_size_).Contains(offset_location)) {
2998     *region = NULL;
2999     return;
3000   }
3001
3002   buffer += location.y() * (*stride);
3003   buffer += (location.x() + page_offset_.x()) * 4;
3004   *region = buffer;
3005 }
3006
3007 void PDFiumEngine::OnSelectionChanged() {
3008   if (HasPermission(PDFEngine::PERMISSION_COPY))
3009     pp::PDF::SetSelectedText(GetPluginInstance(), GetSelectedText().c_str());
3010 }
3011
3012 void PDFiumEngine::RotateInternal() {
3013   // Store the current find index so that we can resume finding at that
3014   // particular index after we have recomputed the find results.
3015   std::string current_find_text = current_find_text_;
3016   if (current_find_index_.valid())
3017     resume_find_index_.SetIndex(current_find_index_.GetIndex());
3018   else
3019     resume_find_index_.Invalidate();
3020
3021   InvalidateAllPages();
3022
3023   if (!current_find_text.empty()) {
3024     // Clear the UI.
3025     client_->NotifyNumberOfFindResultsChanged(0, false);
3026     StartFind(current_find_text.c_str(), false);
3027   }
3028 }
3029
3030 void PDFiumEngine::Form_Invalidate(FPDF_FORMFILLINFO* param,
3031                                    FPDF_PAGE page,
3032                                    double left,
3033                                    double top,
3034                                    double right,
3035                                    double bottom) {
3036   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3037   int page_index = engine->GetVisiblePageIndex(page);
3038   if (page_index == -1) {
3039     // This can sometime happen when the page is closed because it went off
3040     // screen, and PDFium invalidates the control as it's being deleted.
3041     return;
3042   }
3043
3044   pp::Rect rect = engine->pages_[page_index]->PageToScreen(
3045       engine->GetVisibleRect().point(), engine->current_zoom_, left, top, right,
3046       bottom, engine->current_rotation_);
3047   engine->client_->Invalidate(rect);
3048 }
3049
3050 void PDFiumEngine::Form_OutputSelectedRect(FPDF_FORMFILLINFO* param,
3051                                            FPDF_PAGE page,
3052                                            double left,
3053                                            double top,
3054                                            double right,
3055                                            double bottom) {
3056   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3057   int page_index = engine->GetVisiblePageIndex(page);
3058   if (page_index == -1) {
3059     NOTREACHED();
3060     return;
3061   }
3062   pp::Rect rect = engine->pages_[page_index]->PageToScreen(
3063       engine->GetVisibleRect().point(), engine->current_zoom_, left, top, right,
3064       bottom, engine->current_rotation_);
3065   engine->form_highlights_.push_back(rect);
3066 }
3067
3068 void PDFiumEngine::Form_SetCursor(FPDF_FORMFILLINFO* param, int cursor_type) {
3069   // We don't need this since it's not enough to change the cursor in all
3070   // scenarios.  Instead, we check which form field we're under in OnMouseMove.
3071 }
3072
3073 int PDFiumEngine::Form_SetTimer(FPDF_FORMFILLINFO* param,
3074                                 int elapse,
3075                                 TimerCallback timer_func) {
3076   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3077   engine->timers_[++engine->next_timer_id_] =
3078       std::pair<int, TimerCallback>(elapse, timer_func);
3079   engine->client_->ScheduleCallback(engine->next_timer_id_, elapse);
3080   return engine->next_timer_id_;
3081 }
3082
3083 void PDFiumEngine::Form_KillTimer(FPDF_FORMFILLINFO* param, int timer_id) {
3084   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3085   engine->timers_.erase(timer_id);
3086 }
3087
3088 FPDF_SYSTEMTIME PDFiumEngine::Form_GetLocalTime(FPDF_FORMFILLINFO* param) {
3089   base::Time time = base::Time::Now();
3090   base::Time::Exploded exploded;
3091   time.LocalExplode(&exploded);
3092
3093   FPDF_SYSTEMTIME rv;
3094   rv.wYear = exploded.year;
3095   rv.wMonth = exploded.month;
3096   rv.wDayOfWeek = exploded.day_of_week;
3097   rv.wDay = exploded.day_of_month;
3098   rv.wHour = exploded.hour;
3099   rv.wMinute = exploded.minute;
3100   rv.wSecond = exploded.second;
3101   rv.wMilliseconds = exploded.millisecond;
3102   return rv;
3103 }
3104
3105 void PDFiumEngine::Form_OnChange(FPDF_FORMFILLINFO* param) {
3106   // Don't care about.
3107 }
3108
3109 FPDF_PAGE PDFiumEngine::Form_GetPage(FPDF_FORMFILLINFO* param,
3110                                      FPDF_DOCUMENT document,
3111                                      int page_index) {
3112   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3113   if (page_index < 0 || page_index >= static_cast<int>(engine->pages_.size()))
3114     return NULL;
3115   return engine->pages_[page_index]->GetPage();
3116 }
3117
3118 FPDF_PAGE PDFiumEngine::Form_GetCurrentPage(FPDF_FORMFILLINFO* param,
3119                                             FPDF_DOCUMENT document) {
3120   // TODO(jam): find out what this is used for.
3121   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3122   int index = engine->last_page_mouse_down_;
3123   if (index == -1) {
3124     index = engine->GetMostVisiblePage();
3125     if (index == -1) {
3126       NOTREACHED();
3127       return NULL;
3128     }
3129   }
3130
3131   return engine->pages_[index]->GetPage();
3132 }
3133
3134 int PDFiumEngine::Form_GetRotation(FPDF_FORMFILLINFO* param, FPDF_PAGE page) {
3135   return 0;
3136 }
3137
3138 void PDFiumEngine::Form_ExecuteNamedAction(FPDF_FORMFILLINFO* param,
3139                                            FPDF_BYTESTRING named_action) {
3140   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3141   std::string action(named_action);
3142   if (action == "Print") {
3143     engine->client_->Print();
3144     return;
3145   }
3146
3147   int index = engine->last_page_mouse_down_;
3148   /* Don't try to calculate the most visible page if we don't have a left click
3149      before this event (this code originally copied Form_GetCurrentPage which of
3150      course needs to do that and which doesn't have recursion). This can end up
3151      causing infinite recursion. See http://crbug.com/240413 for more
3152      information. Either way, it's not necessary for the spec'd list of named
3153      actions.
3154   if (index == -1)
3155     index = engine->GetMostVisiblePage();
3156   */
3157   if (index == -1)
3158     return;
3159
3160   // This is the only list of named actions per the spec (see 12.6.4.11). Adobe
3161   // Reader supports more, like FitWidth, but since they're not part of the spec
3162   // and we haven't got bugs about them, no need to now.
3163   if (action == "NextPage") {
3164     engine->client_->ScrollToPage(index + 1);
3165   } else if (action == "PrevPage") {
3166     engine->client_->ScrollToPage(index - 1);
3167   } else if (action == "FirstPage") {
3168     engine->client_->ScrollToPage(0);
3169   } else if (action == "LastPage") {
3170     engine->client_->ScrollToPage(engine->pages_.size() - 1);
3171   }
3172 }
3173
3174 void PDFiumEngine::Form_SetTextFieldFocus(FPDF_FORMFILLINFO* param,
3175                                           FPDF_WIDESTRING value,
3176                                           FPDF_DWORD valueLen,
3177                                           FPDF_BOOL is_focus) {
3178   // Do nothing for now.
3179   // TODO(gene): use this signal to trigger OSK.
3180 }
3181
3182 void PDFiumEngine::Form_DoURIAction(FPDF_FORMFILLINFO* param,
3183                                     FPDF_BYTESTRING uri) {
3184   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3185   engine->client_->NavigateTo(std::string(uri), false);
3186 }
3187
3188 void PDFiumEngine::Form_DoGoToAction(FPDF_FORMFILLINFO* param,
3189                                      int page_index,
3190                                      int zoom_mode,
3191                                      float* position_array,
3192                                      int size_of_array) {
3193   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3194   engine->client_->ScrollToPage(page_index);
3195 }
3196
3197 int PDFiumEngine::Form_Alert(IPDF_JSPLATFORM* param,
3198                              FPDF_WIDESTRING message,
3199                              FPDF_WIDESTRING title,
3200                              int type,
3201                              int icon) {
3202   // See fpdfformfill.h for these values.
3203   enum AlertType {
3204     ALERT_TYPE_OK = 0,
3205     ALERT_TYPE_OK_CANCEL,
3206     ALERT_TYPE_YES_ON,
3207     ALERT_TYPE_YES_NO_CANCEL
3208   };
3209
3210   enum AlertResult {
3211     ALERT_RESULT_OK = 1,
3212     ALERT_RESULT_CANCEL,
3213     ALERT_RESULT_NO,
3214     ALERT_RESULT_YES
3215   };
3216
3217   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3218   std::string message_str =
3219       base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(message));
3220   if (type == ALERT_TYPE_OK) {
3221     engine->client_->Alert(message_str);
3222     return ALERT_RESULT_OK;
3223   }
3224
3225   bool rv = engine->client_->Confirm(message_str);
3226   if (type == ALERT_TYPE_OK_CANCEL)
3227     return rv ? ALERT_RESULT_OK : ALERT_RESULT_CANCEL;
3228   return rv ? ALERT_RESULT_YES : ALERT_RESULT_NO;
3229 }
3230
3231 void PDFiumEngine::Form_Beep(IPDF_JSPLATFORM* param, int type) {
3232   // Beeps are annoying, and not possible using javascript, so ignore for now.
3233 }
3234
3235 int PDFiumEngine::Form_Response(IPDF_JSPLATFORM* param,
3236                                 FPDF_WIDESTRING question,
3237                                 FPDF_WIDESTRING title,
3238                                 FPDF_WIDESTRING default_response,
3239                                 FPDF_WIDESTRING label,
3240                                 FPDF_BOOL password,
3241                                 void* response,
3242                                 int length) {
3243   std::string question_str = base::UTF16ToUTF8(
3244       reinterpret_cast<const base::char16*>(question));
3245   std::string default_str = base::UTF16ToUTF8(
3246       reinterpret_cast<const base::char16*>(default_response));
3247
3248   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3249   std::string rv = engine->client_->Prompt(question_str, default_str);
3250   base::string16 rv_16 = base::UTF8ToUTF16(rv);
3251   int rv_bytes = rv_16.size() * sizeof(base::char16);
3252   if (response) {
3253     int bytes_to_copy = rv_bytes < length ? rv_bytes : length;
3254     memcpy(response, rv_16.c_str(), bytes_to_copy);
3255   }
3256   return rv_bytes;
3257 }
3258
3259 int PDFiumEngine::Form_GetFilePath(IPDF_JSPLATFORM* param,
3260                                    void* file_path,
3261                                    int length) {
3262   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3263   std::string rv = engine->client_->GetURL();
3264   if (file_path && rv.size() <= static_cast<size_t>(length))
3265     memcpy(file_path, rv.c_str(), rv.size());
3266   return rv.size();
3267 }
3268
3269 void PDFiumEngine::Form_Mail(IPDF_JSPLATFORM* param,
3270                              void* mail_data,
3271                              int length,
3272                              FPDF_BOOL ui,
3273                              FPDF_WIDESTRING to,
3274                              FPDF_WIDESTRING subject,
3275                              FPDF_WIDESTRING cc,
3276                              FPDF_WIDESTRING bcc,
3277                              FPDF_WIDESTRING message) {
3278   DCHECK(length == 0);  // Don't handle attachments; no way with mailto.
3279   std::string to_str =
3280       base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(to));
3281   std::string cc_str =
3282       base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(cc));
3283   std::string bcc_str =
3284       base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(bcc));
3285   std::string subject_str =
3286       base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(subject));
3287   std::string message_str =
3288       base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(message));
3289
3290   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3291   engine->client_->Email(to_str, cc_str, bcc_str, subject_str, message_str);
3292 }
3293
3294 void PDFiumEngine::Form_Print(IPDF_JSPLATFORM* param,
3295                               FPDF_BOOL ui,
3296                               int start,
3297                               int end,
3298                               FPDF_BOOL silent,
3299                               FPDF_BOOL shrink_to_fit,
3300                               FPDF_BOOL print_as_image,
3301                               FPDF_BOOL reverse,
3302                               FPDF_BOOL annotations) {
3303   // No way to pass the extra information to the print dialog using JavaScript.
3304   // Just opening it is fine for now.
3305   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3306   engine->client_->Print();
3307 }
3308
3309 void PDFiumEngine::Form_SubmitForm(IPDF_JSPLATFORM* param,
3310                                    void* form_data,
3311                                    int length,
3312                                    FPDF_WIDESTRING url) {
3313   std::string url_str =
3314       base::UTF16ToUTF8(reinterpret_cast<const base::char16*>(url));
3315   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3316   engine->client_->SubmitForm(url_str, form_data, length);
3317 }
3318
3319 void PDFiumEngine::Form_GotoPage(IPDF_JSPLATFORM* param,
3320                                  int page_number) {
3321   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3322   engine->client_->ScrollToPage(page_number);
3323 }
3324
3325 int PDFiumEngine::Form_Browse(IPDF_JSPLATFORM* param,
3326                               void* file_path,
3327                               int length) {
3328   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3329   std::string path = engine->client_->ShowFileSelectionDialog();
3330   if (path.size() + 1 <= static_cast<size_t>(length))
3331     memcpy(file_path, &path[0], path.size() + 1);
3332   return path.size() + 1;
3333 }
3334
3335 FPDF_BOOL PDFiumEngine::Pause_NeedToPauseNow(IFSDK_PAUSE* param) {
3336   PDFiumEngine* engine = static_cast<PDFiumEngine*>(param);
3337   return (base::Time::Now() - engine->last_progressive_start_time_).
3338       InMilliseconds() > engine->progressive_paint_timeout_;
3339 }
3340
3341 ScopedUnsupportedFeature::ScopedUnsupportedFeature(PDFiumEngine* engine)
3342     : engine_(engine), old_engine_(g_engine_for_unsupported) {
3343   g_engine_for_unsupported = engine_;
3344 }
3345
3346 ScopedUnsupportedFeature::~ScopedUnsupportedFeature() {
3347   g_engine_for_unsupported = old_engine_;
3348 }
3349
3350 PDFEngineExports* PDFEngineExports::Create() {
3351   return new PDFiumEngineExports;
3352 }
3353
3354 namespace {
3355
3356 int CalculatePosition(FPDF_PAGE page,
3357                       const PDFiumEngineExports::RenderingSettings& settings,
3358                       pp::Rect* dest) {
3359   int page_width = static_cast<int>(
3360       FPDF_GetPageWidth(page) * settings.dpi_x / kPointsPerInch);
3361   int page_height = static_cast<int>(
3362       FPDF_GetPageHeight(page) * settings.dpi_y / kPointsPerInch);
3363
3364   // Start by assuming that we will draw exactly to the bounds rect
3365   // specified.
3366   *dest = settings.bounds;
3367
3368   int rotate = 0;  // normal orientation.
3369
3370   // Auto-rotate landscape pages to print correctly.
3371   if (settings.autorotate &&
3372       (dest->width() > dest->height()) != (page_width > page_height)) {
3373     rotate = 3;  // 90 degrees counter-clockwise.
3374     std::swap(page_width, page_height);
3375   }
3376
3377   // See if we need to scale the output
3378   bool scale_to_bounds = false;
3379   if (settings.fit_to_bounds &&
3380       ((page_width > dest->width()) || (page_height > dest->height()))) {
3381     scale_to_bounds = true;
3382   } else if (settings.stretch_to_bounds &&
3383              ((page_width < dest->width()) || (page_height < dest->height()))) {
3384     scale_to_bounds = true;
3385   }
3386
3387   if (scale_to_bounds) {
3388     // If we need to maintain aspect ratio, calculate the actual width and
3389     // height.
3390     if (settings.keep_aspect_ratio) {
3391       double scale_factor_x = page_width;
3392       scale_factor_x /= dest->width();
3393       double scale_factor_y = page_height;
3394       scale_factor_y /= dest->height();
3395       if (scale_factor_x > scale_factor_y) {
3396         dest->set_height(page_height / scale_factor_x);
3397       } else {
3398         dest->set_width(page_width / scale_factor_y);
3399       }
3400     }
3401   } else {
3402     // We are not scaling to bounds. Draw in the actual page size. If the
3403     // actual page size is larger than the bounds, the output will be
3404     // clipped.
3405     dest->set_width(page_width);
3406     dest->set_height(page_height);
3407   }
3408
3409   if (settings.center_in_bounds) {
3410     pp::Point offset((settings.bounds.width() - dest->width()) / 2,
3411                      (settings.bounds.height() - dest->height()) / 2);
3412     dest->Offset(offset);
3413   }
3414   return rotate;
3415 }
3416
3417 }  // namespace
3418
3419 #if defined(OS_WIN)
3420 bool PDFiumEngineExports::RenderPDFPageToDC(const void* pdf_buffer,
3421                                             int buffer_size,
3422                                             int page_number,
3423                                             const RenderingSettings& settings,
3424                                             HDC dc) {
3425   FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, buffer_size, NULL);
3426   if (!doc)
3427     return false;
3428   FPDF_PAGE page = FPDF_LoadPage(doc, page_number);
3429   if (!page) {
3430     FPDF_CloseDocument(doc);
3431     return false;
3432   }
3433   RenderingSettings new_settings = settings;
3434   // calculate the page size
3435   if (new_settings.dpi_x == -1)
3436     new_settings.dpi_x = GetDeviceCaps(dc, LOGPIXELSX);
3437   if (new_settings.dpi_y == -1)
3438     new_settings.dpi_y = GetDeviceCaps(dc, LOGPIXELSY);
3439
3440   pp::Rect dest;
3441   int rotate = CalculatePosition(page, new_settings, &dest);
3442
3443   int save_state = SaveDC(dc);
3444   // The caller wanted all drawing to happen within the bounds specified.
3445   // Based on scale calculations, our destination rect might be larger
3446   // than the bounds. Set the clip rect to the bounds.
3447   IntersectClipRect(dc, settings.bounds.x(), settings.bounds.y(),
3448                     settings.bounds.x() + settings.bounds.width(),
3449                     settings.bounds.y() + settings.bounds.height());
3450
3451   // A temporary hack. PDFs generated by Cairo (used by Chrome OS to generate
3452   // a PDF output from a webpage) result in very large metafiles and the
3453   // rendering using FPDF_RenderPage is incorrect. In this case, render as a
3454   // bitmap. Note that this code does not kick in for PDFs printed from Chrome
3455   // because in that case we create a temp PDF first before printing and this
3456   // temp PDF does not have a creator string that starts with "cairo".
3457   base::string16 creator;
3458   size_t buffer_bytes = FPDF_GetMetaText(doc, "Creator", NULL, 0);
3459   if (buffer_bytes > 1) {
3460     FPDF_GetMetaText(
3461         doc, "Creator", WriteInto(&creator, buffer_bytes + 1), buffer_bytes);
3462   }
3463   bool use_bitmap = false;
3464   if (StartsWith(creator, L"cairo", false))
3465     use_bitmap = true;
3466
3467   // Another temporary hack. Some PDFs seems to render very slowly if
3468   // FPDF_RenderPage is directly used on a printer DC. I suspect it is
3469   // because of the code to talk Postscript directly to the printer if
3470   // the printer supports this. Need to discuss this with PDFium. For now,
3471   // render to a bitmap and then blit the bitmap to the DC if we have been
3472   // supplied a printer DC.
3473   int device_type = GetDeviceCaps(dc, TECHNOLOGY);
3474   if (use_bitmap ||
3475       (device_type == DT_RASPRINTER) || (device_type == DT_PLOTTER)) {
3476     FPDF_BITMAP bitmap = FPDFBitmap_Create(dest.width(), dest.height(),
3477                                            FPDFBitmap_BGRx);
3478       // Clear the bitmap
3479     FPDFBitmap_FillRect(bitmap, 0, 0, dest.width(), dest.height(), 0xFFFFFFFF);
3480     FPDF_RenderPageBitmap(
3481         bitmap, page, 0, 0, dest.width(), dest.height(), rotate,
3482         FPDF_ANNOT | FPDF_PRINTING | FPDF_NO_CATCH);
3483     int stride = FPDFBitmap_GetStride(bitmap);
3484     BITMAPINFO bmi;
3485     memset(&bmi, 0, sizeof(bmi));
3486     bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
3487     bmi.bmiHeader.biWidth = dest.width();
3488     bmi.bmiHeader.biHeight = -dest.height();  // top-down image
3489     bmi.bmiHeader.biPlanes = 1;
3490     bmi.bmiHeader.biBitCount = 32;
3491     bmi.bmiHeader.biCompression = BI_RGB;
3492     bmi.bmiHeader.biSizeImage = stride * dest.height();
3493     StretchDIBits(dc, dest.x(), dest.y(), dest.width(), dest.height(),
3494                   0, 0, dest.width(), dest.height(),
3495                   FPDFBitmap_GetBuffer(bitmap), &bmi, DIB_RGB_COLORS, SRCCOPY);
3496     FPDFBitmap_Destroy(bitmap);
3497   } else {
3498     FPDF_RenderPage(dc, page, dest.x(), dest.y(), dest.width(), dest.height(),
3499                     rotate, FPDF_ANNOT | FPDF_PRINTING | FPDF_NO_CATCH);
3500   }
3501   RestoreDC(dc, save_state);
3502   FPDF_ClosePage(page);
3503   FPDF_CloseDocument(doc);
3504   return true;
3505 }
3506 #endif  // OS_WIN
3507
3508 bool PDFiumEngineExports::RenderPDFPageToBitmap(
3509     const void* pdf_buffer,
3510     int pdf_buffer_size,
3511     int page_number,
3512     const RenderingSettings& settings,
3513     void* bitmap_buffer) {
3514   FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, NULL);
3515   if (!doc)
3516     return false;
3517   FPDF_PAGE page = FPDF_LoadPage(doc, page_number);
3518   if (!page) {
3519     FPDF_CloseDocument(doc);
3520     return false;
3521   }
3522
3523   pp::Rect dest;
3524   int rotate = CalculatePosition(page, settings, &dest);
3525
3526   FPDF_BITMAP bitmap =
3527       FPDFBitmap_CreateEx(settings.bounds.width(), settings.bounds.height(),
3528                           FPDFBitmap_BGRA, bitmap_buffer,
3529                           settings.bounds.width() * 4);
3530   // Clear the bitmap
3531   FPDFBitmap_FillRect(bitmap, 0, 0, settings.bounds.width(),
3532                       settings.bounds.height(), 0xFFFFFFFF);
3533   // Shift top-left corner of bounds to (0, 0) if it's not there.
3534   dest.set_point(dest.point() - settings.bounds.point());
3535   FPDF_RenderPageBitmap(
3536       bitmap, page, dest.x(), dest.y(), dest.width(), dest.height(), rotate,
3537       FPDF_ANNOT | FPDF_PRINTING | FPDF_NO_CATCH);
3538   FPDFBitmap_Destroy(bitmap);
3539   FPDF_ClosePage(page);
3540   FPDF_CloseDocument(doc);
3541   return true;
3542 }
3543
3544 bool PDFiumEngineExports::GetPDFDocInfo(const void* pdf_buffer,
3545                                         int buffer_size,
3546                                         int* page_count,
3547                                         double* max_page_width) {
3548   FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, buffer_size, NULL);
3549   if (!doc)
3550     return false;
3551   int page_count_local = FPDF_GetPageCount(doc);
3552   if (page_count) {
3553     *page_count = page_count_local;
3554   }
3555   if (max_page_width) {
3556     *max_page_width = 0;
3557     for (int page_number = 0; page_number < page_count_local; page_number++) {
3558       double page_width = 0;
3559       double page_height = 0;
3560       FPDF_GetPageSizeByIndex(doc, page_number, &page_width, &page_height);
3561       if (page_width > *max_page_width) {
3562         *max_page_width = page_width;
3563       }
3564     }
3565   }
3566   FPDF_CloseDocument(doc);
3567   return true;
3568 }
3569
3570 bool PDFiumEngineExports::GetPDFPageSizeByIndex(
3571     const void* pdf_buffer,
3572     int pdf_buffer_size,
3573     int page_number,
3574     double* width,
3575     double* height) {
3576   FPDF_DOCUMENT doc = FPDF_LoadMemDocument(pdf_buffer, pdf_buffer_size, NULL);
3577   if (!doc)
3578     return false;
3579   bool success = FPDF_GetPageSizeByIndex(doc, page_number, width, height) != 0;
3580   FPDF_CloseDocument(doc);
3581   return success;
3582 }
3583
3584 }  // namespace chrome_pdf