src/third_party/skia/src/core/SkDraw.cpp

   1 /*
   2  * Copyright 2006 The Android Open Source Project
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "SkDraw.h"
   9 #include "SkBlitter.h"
  10 #include "SkCanvas.h"
  11 #include "SkColorPriv.h"
  12 #include "SkDevice.h"
  13 #include "SkDeviceLooper.h"
  14 #include "SkFixed.h"
  15 #include "SkMaskFilter.h"
  16 #include "SkPaint.h"
  17 #include "SkPathEffect.h"
  18 #include "SkRasterClip.h"
  19 #include "SkRasterizer.h"
  20 #include "SkRRect.h"
  21 #include "SkScan.h"
  22 #include "SkShader.h"
  23 #include "SkSmallAllocator.h"
  24 #include "SkString.h"
  25 #include "SkStroke.h"
  26 #include "SkTextMapStateProc.h"
  27 #include "SkTLazy.h"
  28 #include "SkUtils.h"
  29 #include "SkVertState.h"
  30
  31 #include "SkAutoKern.h"
  32 #include "SkBitmapProcShader.h"
  33 #include "SkDrawProcs.h"
  34 #include "SkMatrixUtils.h"
  35
  36
  37 //#define TRACE_BITMAP_DRAWS
  38
  39
  40 /** Helper for allocating small blitters on the stack.
  41  */
  42 class SkAutoBlitterChoose : SkNoncopyable {
  43 public:
  44     SkAutoBlitterChoose() {
  45         fBlitter = NULL;
  46     }
  47     SkAutoBlitterChoose(const SkBitmap& device, const SkMatrix& matrix,
  48                         const SkPaint& paint, bool drawCoverage = false) {
  49         fBlitter = SkBlitter::Choose(device, matrix, paint, &fAllocator,
  50                                      drawCoverage);
  51     }
  52
  53     SkBlitter*  operator->() { return fBlitter; }
  54     SkBlitter*  get() const { return fBlitter; }
  55
  56     void choose(const SkBitmap& device, const SkMatrix& matrix,
  57                 const SkPaint& paint, bool drawCoverage = false) {
  58         SkASSERT(!fBlitter);
  59         fBlitter = SkBlitter::Choose(device, matrix, paint, &fAllocator,
  60                                      drawCoverage);
  61     }
  62
  63 private:
  64     // Owned by fAllocator, which will handle the delete.
  65     SkBlitter*          fBlitter;
  66     SkTBlitterAllocator fAllocator;
  67 };
  68 #define SkAutoBlitterChoose(...) SK_REQUIRE_LOCAL_VAR(SkAutoBlitterChoose)
  69
  70 /**
  71  *  Since we are providing the storage for the shader (to avoid the perf cost
  72  *  of calling new) we insist that in our destructor we can account for all
  73  *  owners of the shader.
  74  */
  75 class SkAutoBitmapShaderInstall : SkNoncopyable {
  76 public:
  77     SkAutoBitmapShaderInstall(const SkBitmap& src, const SkPaint& paint,
  78                               const SkMatrix* localMatrix = NULL)
  79             : fPaint(paint) /* makes a copy of the paint */ {
  80         fPaint.setShader(CreateBitmapShader(src, SkShader::kClamp_TileMode,
  81                                             SkShader::kClamp_TileMode,
  82                                             localMatrix, &fAllocator));
  83         // we deliberately left the shader with an owner-count of 2
  84         SkASSERT(2 == fPaint.getShader()->getRefCnt());
  85     }
  86
  87     ~SkAutoBitmapShaderInstall() {
  88         // since fAllocator will destroy shader, we insist that owners == 2
  89         SkASSERT(2 == fPaint.getShader()->getRefCnt());
  90
  91         fPaint.setShader(NULL); // unref the shader by 1
  92
  93     }
  94
  95     // return the new paint that has the shader applied
  96     const SkPaint& paintWithShader() const { return fPaint; }
  97
  98 private:
  99     // copy of caller's paint (which we then modify)
 100     SkPaint             fPaint;
 101     // Stores the shader.
 102     SkTBlitterAllocator fAllocator;
 103 };
 104 #define SkAutoBitmapShaderInstall(...) SK_REQUIRE_LOCAL_VAR(SkAutoBitmapShaderInstall)
 105
 106 ///////////////////////////////////////////////////////////////////////////////
 107
 108 SkDraw::SkDraw() {
 109     sk_bzero(this, sizeof(*this));
 110 }
 111
 112 SkDraw::SkDraw(const SkDraw& src) {
 113     memcpy(this, &src, sizeof(*this));
 114 }
 115
 116 bool SkDraw::computeConservativeLocalClipBounds(SkRect* localBounds) const {
 117     if (fRC->isEmpty()) {
 118         return false;
 119     }
 120
 121     SkMatrix inverse;
 122     if (!fMatrix->invert(&inverse)) {
 123         return false;
 124     }
 125
 126     SkIRect devBounds = fRC->getBounds();
 127     // outset to have slop for antialasing and hairlines
 128     devBounds.outset(1, 1);
 129     inverse.mapRect(localBounds, SkRect::Make(devBounds));
 130     return true;
 131 }
 132
 133 ///////////////////////////////////////////////////////////////////////////////
 134
 135 typedef void (*BitmapXferProc)(void* pixels, size_t bytes, uint32_t data);
 136
 137 static void D_Clear_BitmapXferProc(void* pixels, size_t bytes, uint32_t) {
 138     sk_bzero(pixels, bytes);
 139 }
 140
 141 static void D_Dst_BitmapXferProc(void*, size_t, uint32_t data) {}
 142
 143 static void D32_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) {
 144     sk_memset32((uint32_t*)pixels, data, SkToInt(bytes >> 2));
 145 }
 146
 147 static void D16_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) {
 148     sk_memset16((uint16_t*)pixels, data, SkToInt(bytes >> 1));
 149 }
 150
 151 static void DA8_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) {
 152     memset(pixels, data, bytes);
 153 }
 154
 155 static BitmapXferProc ChooseBitmapXferProc(const SkBitmap& bitmap,
 156                                            const SkPaint& paint,
 157                                            uint32_t* data) {
 158     // todo: we can apply colorfilter up front if no shader, so we wouldn't
 159     // need to abort this fastpath
 160     if (paint.getShader() || paint.getColorFilter()) {
 161         return NULL;
 162     }
 163
 164     SkXfermode::Mode mode;
 165     if (!SkXfermode::AsMode(paint.getXfermode(), &mode)) {
 166         return NULL;
 167     }
 168
 169     SkColor color = paint.getColor();
 170
 171     // collaps modes based on color...
 172     if (SkXfermode::kSrcOver_Mode == mode) {
 173         unsigned alpha = SkColorGetA(color);
 174         if (0 == alpha) {
 175             mode = SkXfermode::kDst_Mode;
 176         } else if (0xFF == alpha) {
 177             mode = SkXfermode::kSrc_Mode;
 178         }
 179     }
 180
 181     switch (mode) {
 182         case SkXfermode::kClear_Mode:
 183 //            SkDebugf("--- D_Clear_BitmapXferProc\n");
 184             return D_Clear_BitmapXferProc;  // ignore data
 185         case SkXfermode::kDst_Mode:
 186 //            SkDebugf("--- D_Dst_BitmapXferProc\n");
 187             return D_Dst_BitmapXferProc;    // ignore data
 188         case SkXfermode::kSrc_Mode: {
 189             /*
 190                 should I worry about dithering for the lower depths?
 191             */
 192             SkPMColor pmc = SkPreMultiplyColor(color);
 193             switch (bitmap.colorType()) {
 194                 case kN32_SkColorType:
 195                     if (data) {
 196                         *data = pmc;
 197                     }
 198 //                    SkDebugf("--- D32_Src_BitmapXferProc\n");
 199                     return D32_Src_BitmapXferProc;
 200                 case kRGB_565_SkColorType:
 201                     if (data) {
 202                         *data = SkPixel32ToPixel16(pmc);
 203                     }
 204 //                    SkDebugf("--- D16_Src_BitmapXferProc\n");
 205                     return D16_Src_BitmapXferProc;
 206                 case kAlpha_8_SkColorType:
 207                     if (data) {
 208                         *data = SkGetPackedA32(pmc);
 209                     }
 210 //                    SkDebugf("--- DA8_Src_BitmapXferProc\n");
 211                     return DA8_Src_BitmapXferProc;
 212                 default:
 213                     break;
 214             }
 215             break;
 216         }
 217         default:
 218             break;
 219     }
 220     return NULL;
 221 }
 222
 223 static void CallBitmapXferProc(const SkBitmap& bitmap, const SkIRect& rect,
 224                                BitmapXferProc proc, uint32_t procData) {
 225     int shiftPerPixel;
 226     switch (bitmap.colorType()) {
 227         case kN32_SkColorType:
 228             shiftPerPixel = 2;
 229             break;
 230         case kRGB_565_SkColorType:
 231             shiftPerPixel = 1;
 232             break;
 233         case kAlpha_8_SkColorType:
 234             shiftPerPixel = 0;
 235             break;
 236         default:
 237             SkDEBUGFAIL("Can't use xferproc on this config");
 238             return;
 239     }
 240
 241     uint8_t* pixels = (uint8_t*)bitmap.getPixels();
 242     SkASSERT(pixels);
 243     const size_t rowBytes = bitmap.rowBytes();
 244     const int widthBytes = rect.width() << shiftPerPixel;
 245
 246     // skip down to the first scanline and X position
 247     pixels += rect.fTop * rowBytes + (rect.fLeft << shiftPerPixel);
 248     for (int scans = rect.height() - 1; scans >= 0; --scans) {
 249         proc(pixels, widthBytes, procData);
 250         pixels += rowBytes;
 251     }
 252 }
 253
 254 void SkDraw::drawPaint(const SkPaint& paint) const {
 255     SkDEBUGCODE(this->validate();)
 256
 257     if (fRC->isEmpty()) {
 258         return;
 259     }
 260
 261     SkIRect    devRect;
 262     devRect.set(0, 0, fBitmap->width(), fBitmap->height());
 263
 264     if (fRC->isBW()) {
 265         /*  If we don't have a shader (i.e. we're just a solid color) we may
 266             be faster to operate directly on the device bitmap, rather than invoking
 267             a blitter. Esp. true for xfermodes, which require a colorshader to be
 268             present, which is just redundant work. Since we're drawing everywhere
 269             in the clip, we don't have to worry about antialiasing.
 270         */
 271         uint32_t procData = 0;  // to avoid the warning
 272         BitmapXferProc proc = ChooseBitmapXferProc(*fBitmap, paint, &procData);
 273         if (proc) {
 274             if (D_Dst_BitmapXferProc == proc) { // nothing to do
 275                 return;
 276             }
 277
 278             SkRegion::Iterator iter(fRC->bwRgn());
 279             while (!iter.done()) {
 280                 CallBitmapXferProc(*fBitmap, iter.rect(), proc, procData);
 281                 iter.next();
 282             }
 283             return;
 284         }
 285     }
 286
 287     // normal case: use a blitter
 288     SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, paint);
 289     SkScan::FillIRect(devRect, *fRC, blitter.get());
 290 }
 291
 292 ///////////////////////////////////////////////////////////////////////////////
 293
 294 struct PtProcRec {
 295     SkCanvas::PointMode fMode;
 296     const SkPaint*  fPaint;
 297     const SkRegion* fClip;
 298     const SkRasterClip* fRC;
 299
 300     // computed values
 301     SkFixed fRadius;
 302
 303     typedef void (*Proc)(const PtProcRec&, const SkPoint devPts[], int count,
 304                          SkBlitter*);
 305
 306     bool init(SkCanvas::PointMode, const SkPaint&, const SkMatrix* matrix,
 307               const SkRasterClip*);
 308     Proc chooseProc(SkBlitter** blitter);
 309
 310 private:
 311     SkAAClipBlitterWrapper fWrapper;
 312 };
 313
 314 static void bw_pt_rect_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
 315                                  int count, SkBlitter* blitter) {
 316     SkASSERT(rec.fClip->isRect());
 317     const SkIRect& r = rec.fClip->getBounds();
 318
 319     for (int i = 0; i < count; i++) {
 320         int x = SkScalarFloorToInt(devPts[i].fX);
 321         int y = SkScalarFloorToInt(devPts[i].fY);
 322         if (r.contains(x, y)) {
 323             blitter->blitH(x, y, 1);
 324         }
 325     }
 326 }
 327
 328 static void bw_pt_rect_16_hair_proc(const PtProcRec& rec,
 329                                     const SkPoint devPts[], int count,
 330                                     SkBlitter* blitter) {
 331     SkASSERT(rec.fRC->isRect());
 332     const SkIRect& r = rec.fRC->getBounds();
 333     uint32_t value;
 334     const SkBitmap* bitmap = blitter->justAnOpaqueColor(&value);
 335     SkASSERT(bitmap);
 336
 337     uint16_t* addr = bitmap->getAddr16(0, 0);
 338     size_t    rb = bitmap->rowBytes();
 339
 340     for (int i = 0; i < count; i++) {
 341         int x = SkScalarFloorToInt(devPts[i].fX);
 342         int y = SkScalarFloorToInt(devPts[i].fY);
 343         if (r.contains(x, y)) {
 344             ((uint16_t*)((char*)addr + y * rb))[x] = SkToU16(value);
 345         }
 346     }
 347 }
 348
 349 static void bw_pt_rect_32_hair_proc(const PtProcRec& rec,
 350                                     const SkPoint devPts[], int count,
 351                                     SkBlitter* blitter) {
 352     SkASSERT(rec.fRC->isRect());
 353     const SkIRect& r = rec.fRC->getBounds();
 354     uint32_t value;
 355     const SkBitmap* bitmap = blitter->justAnOpaqueColor(&value);
 356     SkASSERT(bitmap);
 357
 358     SkPMColor* addr = bitmap->getAddr32(0, 0);
 359     size_t     rb = bitmap->rowBytes();
 360
 361     for (int i = 0; i < count; i++) {
 362         int x = SkScalarFloorToInt(devPts[i].fX);
 363         int y = SkScalarFloorToInt(devPts[i].fY);
 364         if (r.contains(x, y)) {
 365             ((SkPMColor*)((char*)addr + y * rb))[x] = value;
 366         }
 367     }
 368 }
 369
 370 static void bw_pt_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
 371                             int count, SkBlitter* blitter) {
 372     for (int i = 0; i < count; i++) {
 373         int x = SkScalarFloorToInt(devPts[i].fX);
 374         int y = SkScalarFloorToInt(devPts[i].fY);
 375         if (rec.fClip->contains(x, y)) {
 376             blitter->blitH(x, y, 1);
 377         }
 378     }
 379 }
 380
 381 static void bw_line_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
 382                               int count, SkBlitter* blitter) {
 383     for (int i = 0; i < count; i += 2) {
 384         SkScan::HairLine(devPts[i], devPts[i+1], *rec.fRC, blitter);
 385     }
 386 }
 387
 388 static void bw_poly_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
 389                               int count, SkBlitter* blitter) {
 390     for (int i = 0; i < count - 1; i++) {
 391         SkScan::HairLine(devPts[i], devPts[i+1], *rec.fRC, blitter);
 392     }
 393 }
 394
 395 // aa versions
 396
 397 static void aa_line_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
 398                               int count, SkBlitter* blitter) {
 399     for (int i = 0; i < count; i += 2) {
 400         SkScan::AntiHairLine(devPts[i], devPts[i+1], *rec.fRC, blitter);
 401     }
 402 }
 403
 404 static void aa_poly_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
 405                               int count, SkBlitter* blitter) {
 406     for (int i = 0; i < count - 1; i++) {
 407         SkScan::AntiHairLine(devPts[i], devPts[i+1], *rec.fRC, blitter);
 408     }
 409 }
 410
 411 // square procs (strokeWidth > 0 but matrix is square-scale (sx == sy)
 412
 413 static void bw_square_proc(const PtProcRec& rec, const SkPoint devPts[],
 414                            int count, SkBlitter* blitter) {
 415     const SkFixed radius = rec.fRadius;
 416     for (int i = 0; i < count; i++) {
 417         SkFixed x = SkScalarToFixed(devPts[i].fX);
 418         SkFixed y = SkScalarToFixed(devPts[i].fY);
 419
 420         SkXRect r;
 421         r.fLeft = x - radius;
 422         r.fTop = y - radius;
 423         r.fRight = x + radius;
 424         r.fBottom = y + radius;
 425
 426         SkScan::FillXRect(r, *rec.fRC, blitter);
 427     }
 428 }
 429
 430 static void aa_square_proc(const PtProcRec& rec, const SkPoint devPts[],
 431                            int count, SkBlitter* blitter) {
 432     const SkFixed radius = rec.fRadius;
 433     for (int i = 0; i < count; i++) {
 434         SkFixed x = SkScalarToFixed(devPts[i].fX);
 435         SkFixed y = SkScalarToFixed(devPts[i].fY);
 436
 437         SkXRect r;
 438         r.fLeft = x - radius;
 439         r.fTop = y - radius;
 440         r.fRight = x + radius;
 441         r.fBottom = y + radius;
 442
 443         SkScan::AntiFillXRect(r, *rec.fRC, blitter);
 444     }
 445 }
 446
 447 // If this guy returns true, then chooseProc() must return a valid proc
 448 bool PtProcRec::init(SkCanvas::PointMode mode, const SkPaint& paint,
 449                      const SkMatrix* matrix, const SkRasterClip* rc) {
 450     if (paint.getPathEffect()) {
 451         return false;
 452     }
 453     SkScalar width = paint.getStrokeWidth();
 454     if (0 == width) {
 455         fMode = mode;
 456         fPaint = &paint;
 457         fClip = NULL;
 458         fRC = rc;
 459         fRadius = SK_FixedHalf;
 460         return true;
 461     }
 462     if (paint.getStrokeCap() != SkPaint::kRound_Cap &&
 463             matrix->rectStaysRect() && SkCanvas::kPoints_PointMode == mode) {
 464         SkScalar sx = matrix->get(SkMatrix::kMScaleX);
 465         SkScalar sy = matrix->get(SkMatrix::kMScaleY);
 466         if (SkScalarNearlyZero(sx - sy)) {
 467             if (sx < 0) {
 468                 sx = -sx;
 469             }
 470
 471             fMode = mode;
 472             fPaint = &paint;
 473             fClip = NULL;
 474             fRC = rc;
 475             fRadius = SkScalarToFixed(SkScalarMul(width, sx)) >> 1;
 476             return true;
 477         }
 478     }
 479     return false;
 480 }
 481
 482 PtProcRec::Proc PtProcRec::chooseProc(SkBlitter** blitterPtr) {
 483     Proc proc = NULL;
 484
 485     SkBlitter* blitter = *blitterPtr;
 486     if (fRC->isBW()) {
 487         fClip = &fRC->bwRgn();
 488     } else {
 489         fWrapper.init(*fRC, blitter);
 490         fClip = &fWrapper.getRgn();
 491         blitter = fWrapper.getBlitter();
 492         *blitterPtr = blitter;
 493     }
 494
 495     // for our arrays
 496     SkASSERT(0 == SkCanvas::kPoints_PointMode);
 497     SkASSERT(1 == SkCanvas::kLines_PointMode);
 498     SkASSERT(2 == SkCanvas::kPolygon_PointMode);
 499     SkASSERT((unsigned)fMode <= (unsigned)SkCanvas::kPolygon_PointMode);
 500
 501     if (fPaint->isAntiAlias()) {
 502         if (0 == fPaint->getStrokeWidth()) {
 503             static const Proc gAAProcs[] = {
 504                 aa_square_proc, aa_line_hair_proc, aa_poly_hair_proc
 505             };
 506             proc = gAAProcs[fMode];
 507         } else if (fPaint->getStrokeCap() != SkPaint::kRound_Cap) {
 508             SkASSERT(SkCanvas::kPoints_PointMode == fMode);
 509             proc = aa_square_proc;
 510         }
 511     } else {    // BW
 512         if (fRadius <= SK_FixedHalf) {    // small radii and hairline
 513             if (SkCanvas::kPoints_PointMode == fMode && fClip->isRect()) {
 514                 uint32_t value;
 515                 const SkBitmap* bm = blitter->justAnOpaqueColor(&value);
 516                 if (bm && kRGB_565_SkColorType == bm->colorType()) {
 517                     proc = bw_pt_rect_16_hair_proc;
 518                 } else if (bm && kN32_SkColorType == bm->colorType()) {
 519                     proc = bw_pt_rect_32_hair_proc;
 520                 } else {
 521                     proc = bw_pt_rect_hair_proc;
 522                 }
 523             } else {
 524                 static Proc gBWProcs[] = {
 525                     bw_pt_hair_proc, bw_line_hair_proc, bw_poly_hair_proc
 526                 };
 527                 proc = gBWProcs[fMode];
 528             }
 529         } else {
 530             proc = bw_square_proc;
 531         }
 532     }
 533     return proc;
 534 }
 535
 536 // each of these costs 8-bytes of stack space, so don't make it too large
 537 // must be even for lines/polygon to work
 538 #define MAX_DEV_PTS     32
 539
 540 void SkDraw::drawPoints(SkCanvas::PointMode mode, size_t count,
 541                         const SkPoint pts[], const SkPaint& paint,
 542                         bool forceUseDevice) const {
 543     // if we're in lines mode, force count to be even
 544     if (SkCanvas::kLines_PointMode == mode) {
 545         count &= ~(size_t)1;
 546     }
 547
 548     if ((long)count <= 0) {
 549         return;
 550     }
 551
 552     SkASSERT(pts != NULL);
 553     SkDEBUGCODE(this->validate();)
 554
 555      // nothing to draw
 556     if (fRC->isEmpty()) {
 557         return;
 558     }
 559
 560     PtProcRec rec;
 561     if (!forceUseDevice && rec.init(mode, paint, fMatrix, fRC)) {
 562         SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, paint);
 563
 564         SkPoint             devPts[MAX_DEV_PTS];
 565         const SkMatrix*     matrix = fMatrix;
 566         SkBlitter*          bltr = blitter.get();
 567         PtProcRec::Proc     proc = rec.chooseProc(&bltr);
 568         // we have to back up subsequent passes if we're in polygon mode
 569         const size_t backup = (SkCanvas::kPolygon_PointMode == mode);
 570
 571         do {
 572             int n = SkToInt(count);
 573             if (n > MAX_DEV_PTS) {
 574                 n = MAX_DEV_PTS;
 575             }
 576             matrix->mapPoints(devPts, pts, n);
 577             proc(rec, devPts, n, bltr);
 578             pts += n - backup;
 579             SkASSERT(SkToInt(count) >= n);
 580             count -= n;
 581             if (count > 0) {
 582                 count += backup;
 583             }
 584         } while (count != 0);
 585     } else {
 586         switch (mode) {
 587             case SkCanvas::kPoints_PointMode: {
 588                 // temporarily mark the paint as filling.
 589                 SkPaint newPaint(paint);
 590                 newPaint.setStyle(SkPaint::kFill_Style);
 591
 592                 SkScalar width = newPaint.getStrokeWidth();
 593                 SkScalar radius = SkScalarHalf(width);
 594
 595                 if (newPaint.getStrokeCap() == SkPaint::kRound_Cap) {
 596                     SkPath      path;
 597                     SkMatrix    preMatrix;
 598
 599                     path.addCircle(0, 0, radius);
 600                     for (size_t i = 0; i < count; i++) {
 601                         preMatrix.setTranslate(pts[i].fX, pts[i].fY);
 602                         // pass true for the last point, since we can modify
 603                         // then path then
 604                         if (fDevice) {
 605                             fDevice->drawPath(*this, path, newPaint, &preMatrix,
 606                                               (count-1) == i);
 607                         } else {
 608                             this->drawPath(path, newPaint, &preMatrix,
 609                                            (count-1) == i);
 610                         }
 611                     }
 612                 } else {
 613                     SkRect  r;
 614
 615                     for (size_t i = 0; i < count; i++) {
 616                         r.fLeft = pts[i].fX - radius;
 617                         r.fTop = pts[i].fY - radius;
 618                         r.fRight = r.fLeft + width;
 619                         r.fBottom = r.fTop + width;
 620                         if (fDevice) {
 621                             fDevice->drawRect(*this, r, newPaint);
 622                         } else {
 623                             this->drawRect(r, newPaint);
 624                         }
 625                     }
 626                 }
 627                 break;
 628             }
 629             case SkCanvas::kLines_PointMode:
 630 #ifndef SK_DISABLE_DASHING_OPTIMIZATION
 631                 if (2 == count && paint.getPathEffect()) {
 632                     // most likely a dashed line - see if it is one of the ones
 633                     // we can accelerate
 634                     SkStrokeRec rec(paint);
 635                     SkPathEffect::PointData pointData;
 636
 637                     SkPath path;
 638                     path.moveTo(pts[0]);
 639                     path.lineTo(pts[1]);
 640
 641                     SkRect cullRect = SkRect::Make(fRC->getBounds());
 642
 643                     if (paint.getPathEffect()->asPoints(&pointData, path, rec,
 644                                                         *fMatrix, &cullRect)) {
 645                         // 'asPoints' managed to find some fast path
 646
 647                         SkPaint newP(paint);
 648                         newP.setPathEffect(NULL);
 649                         newP.setStyle(SkPaint::kFill_Style);
 650
 651                         if (!pointData.fFirst.isEmpty()) {
 652                             if (fDevice) {
 653                                 fDevice->drawPath(*this, pointData.fFirst, newP);
 654                             } else {
 655                                 this->drawPath(pointData.fFirst, newP);
 656                             }
 657                         }
 658
 659                         if (!pointData.fLast.isEmpty()) {
 660                             if (fDevice) {
 661                                 fDevice->drawPath(*this, pointData.fLast, newP);
 662                             } else {
 663                                 this->drawPath(pointData.fLast, newP);
 664                             }
 665                         }
 666
 667                         if (pointData.fSize.fX == pointData.fSize.fY) {
 668                             // The rest of the dashed line can just be drawn as points
 669                             SkASSERT(pointData.fSize.fX == SkScalarHalf(newP.getStrokeWidth()));
 670
 671                             if (SkPathEffect::PointData::kCircles_PointFlag & pointData.fFlags) {
 672                                 newP.setStrokeCap(SkPaint::kRound_Cap);
 673                             } else {
 674                                 newP.setStrokeCap(SkPaint::kButt_Cap);
 675                             }
 676
 677                             if (fDevice) {
 678                                 fDevice->drawPoints(*this,
 679                                                     SkCanvas::kPoints_PointMode,
 680                                                     pointData.fNumPoints,
 681                                                     pointData.fPoints,
 682                                                     newP);
 683                             } else {
 684                                 this->drawPoints(SkCanvas::kPoints_PointMode,
 685                                                  pointData.fNumPoints,
 686                                                  pointData.fPoints,
 687                                                  newP,
 688                                                  forceUseDevice);
 689                             }
 690                             break;
 691                         } else {
 692                             // The rest of the dashed line must be drawn as rects
 693                             SkASSERT(!(SkPathEffect::PointData::kCircles_PointFlag &
 694                                       pointData.fFlags));
 695
 696                             SkRect r;
 697
 698                             for (int i = 0; i < pointData.fNumPoints; ++i) {
 699                                 r.set(pointData.fPoints[i].fX - pointData.fSize.fX,
 700                                       pointData.fPoints[i].fY - pointData.fSize.fY,
 701                                       pointData.fPoints[i].fX + pointData.fSize.fX,
 702                                       pointData.fPoints[i].fY + pointData.fSize.fY);
 703                                 if (fDevice) {
 704                                     fDevice->drawRect(*this, r, newP);
 705                                 } else {
 706                                     this->drawRect(r, newP);
 707                                 }
 708                             }
 709                         }
 710
 711                         break;
 712                     }
 713                 }
 714 #endif // DISABLE_DASHING_OPTIMIZATION
 715                 // couldn't take fast path so fall through!
 716             case SkCanvas::kPolygon_PointMode: {
 717                 count -= 1;
 718                 SkPath path;
 719                 SkPaint p(paint);
 720                 p.setStyle(SkPaint::kStroke_Style);
 721                 size_t inc = (SkCanvas::kLines_PointMode == mode) ? 2 : 1;
 722                 for (size_t i = 0; i < count; i += inc) {
 723                     path.moveTo(pts[i]);
 724                     path.lineTo(pts[i+1]);
 725                     if (fDevice) {
 726                         fDevice->drawPath(*this, path, p, NULL, true);
 727                     } else {
 728                         this->drawPath(path, p, NULL, true);
 729                     }
 730                     path.rewind();
 731                 }
 732                 break;
 733             }
 734         }
 735     }
 736 }
 737
 738 static bool easy_rect_join(const SkPaint& paint, const SkMatrix& matrix,
 739                            SkPoint* strokeSize) {
 740     if (SkPaint::kMiter_Join != paint.getStrokeJoin() ||
 741         paint.getStrokeMiter() < SK_ScalarSqrt2) {
 742         return false;
 743     }
 744
 745     SkASSERT(matrix.rectStaysRect());
 746     SkPoint pt = { paint.getStrokeWidth(), paint.getStrokeWidth() };
 747     matrix.mapVectors(strokeSize, &pt, 1);
 748     strokeSize->fX = SkScalarAbs(strokeSize->fX);
 749     strokeSize->fY = SkScalarAbs(strokeSize->fY);
 750     return true;
 751 }
 752
 753 SkDraw::RectType SkDraw::ComputeRectType(const SkPaint& paint,
 754                                          const SkMatrix& matrix,
 755                                          SkPoint* strokeSize) {
 756     RectType rtype;
 757     const SkScalar width = paint.getStrokeWidth();
 758     const bool zeroWidth = (0 == width);
 759     SkPaint::Style style = paint.getStyle();
 760
 761     if ((SkPaint::kStrokeAndFill_Style == style) && zeroWidth) {
 762         style = SkPaint::kFill_Style;
 763     }
 764
 765     if (paint.getPathEffect() || paint.getMaskFilter() ||
 766         paint.getRasterizer() || !matrix.rectStaysRect() ||
 767         SkPaint::kStrokeAndFill_Style == style) {
 768         rtype = kPath_RectType;
 769     } else if (SkPaint::kFill_Style == style) {
 770         rtype = kFill_RectType;
 771     } else if (zeroWidth) {
 772         rtype = kHair_RectType;
 773     } else if (easy_rect_join(paint, matrix, strokeSize)) {
 774         rtype = kStroke_RectType;
 775     } else {
 776         rtype = kPath_RectType;
 777     }
 778     return rtype;
 779 }
 780
 781 static const SkPoint* rect_points(const SkRect& r) {
 782     return SkTCast<const SkPoint*>(&r);
 783 }
 784
 785 static SkPoint* rect_points(SkRect& r) {
 786     return SkTCast<SkPoint*>(&r);
 787 }
 788
 789 void SkDraw::drawRect(const SkRect& rect, const SkPaint& paint) const {
 790     SkDEBUGCODE(this->validate();)
 791
 792     // nothing to draw
 793     if (fRC->isEmpty()) {
 794         return;
 795     }
 796
 797     SkPoint strokeSize;
 798     RectType rtype = ComputeRectType(paint, *fMatrix, &strokeSize);
 799
 800     if (kPath_RectType == rtype) {
 801         SkPath  tmp;
 802         tmp.addRect(rect);
 803         tmp.setFillType(SkPath::kWinding_FillType);
 804         this->drawPath(tmp, paint, NULL, true);
 805         return;
 806     }
 807
 808     const SkMatrix& matrix = *fMatrix;
 809     SkRect          devRect;
 810
 811     // transform rect into devRect
 812     matrix.mapPoints(rect_points(devRect), rect_points(rect), 2);
 813     devRect.sort();
 814
 815     // look for the quick exit, before we build a blitter
 816     SkIRect ir;
 817     devRect.roundOut(&ir);
 818     if (paint.getStyle() != SkPaint::kFill_Style) {
 819         // extra space for hairlines
 820         if (paint.getStrokeWidth() == 0) {
 821             ir.outset(1, 1);
 822         } else {
 823             SkScalar radius = SkScalarHalf(paint.getStrokeWidth());
 824             ir.outset(radius, radius);
 825         }
 826     }
 827     if (fRC->quickReject(ir)) {
 828         return;
 829     }
 830
 831     SkDeviceLooper looper(*fBitmap, *fRC, ir, paint.isAntiAlias());
 832     while (looper.next()) {
 833         SkRect localDevRect;
 834         looper.mapRect(&localDevRect, devRect);
 835         SkMatrix localMatrix;
 836         looper.mapMatrix(&localMatrix, matrix);
 837
 838         SkAutoBlitterChoose blitterStorage(looper.getBitmap(), localMatrix,
 839                                            paint);
 840         const SkRasterClip& clip = looper.getRC();
 841         SkBlitter*          blitter = blitterStorage.get();
 842
 843         // we want to "fill" if we are kFill or kStrokeAndFill, since in the latter
 844         // case we are also hairline (if we've gotten to here), which devolves to
 845         // effectively just kFill
 846         switch (rtype) {
 847             case kFill_RectType:
 848                 if (paint.isAntiAlias()) {
 849                     SkScan::AntiFillRect(localDevRect, clip, blitter);
 850                 } else {
 851                     SkScan::FillRect(localDevRect, clip, blitter);
 852                 }
 853                 break;
 854             case kStroke_RectType:
 855                 if (paint.isAntiAlias()) {
 856                     SkScan::AntiFrameRect(localDevRect, strokeSize, clip, blitter);
 857                 } else {
 858                     SkScan::FrameRect(localDevRect, strokeSize, clip, blitter);
 859                 }
 860                 break;
 861             case kHair_RectType:
 862                 if (paint.isAntiAlias()) {
 863                     SkScan::AntiHairRect(localDevRect, clip, blitter);
 864                 } else {
 865                     SkScan::HairRect(localDevRect, clip, blitter);
 866                 }
 867                 break;
 868             default:
 869                 SkDEBUGFAIL("bad rtype");
 870         }
 871     }
 872 }
 873
 874 void SkDraw::drawDevMask(const SkMask& srcM, const SkPaint& paint) const {
 875     if (srcM.fBounds.isEmpty()) {
 876         return;
 877     }
 878
 879     const SkMask* mask = &srcM;
 880
 881     SkMask dstM;
 882     if (paint.getMaskFilter() &&
 883             paint.getMaskFilter()->filterMask(&dstM, srcM, *fMatrix, NULL)) {
 884         mask = &dstM;
 885     } else {
 886         dstM.fImage = NULL;
 887     }
 888     SkAutoMaskFreeImage ami(dstM.fImage);
 889
 890     SkAutoBlitterChoose blitterChooser(*fBitmap, *fMatrix, paint);
 891     SkBlitter* blitter = blitterChooser.get();
 892
 893     SkAAClipBlitterWrapper wrapper;
 894     const SkRegion* clipRgn;
 895
 896     if (fRC->isBW()) {
 897         clipRgn = &fRC->bwRgn();
 898     } else {
 899         wrapper.init(*fRC, blitter);
 900         clipRgn = &wrapper.getRgn();
 901         blitter = wrapper.getBlitter();
 902     }
 903     blitter->blitMaskRegion(*mask, *clipRgn);
 904 }
 905
 906 static SkScalar fast_len(const SkVector& vec) {
 907     SkScalar x = SkScalarAbs(vec.fX);
 908     SkScalar y = SkScalarAbs(vec.fY);
 909     if (x < y) {
 910         SkTSwap(x, y);
 911     }
 912     return x + SkScalarHalf(y);
 913 }
 914
 915 static bool xfermodeSupportsCoverageAsAlpha(SkXfermode* xfer) {
 916     SkXfermode::Coeff dc;
 917     if (!SkXfermode::AsCoeff(xfer, NULL, &dc)) {
 918         return false;
 919     }
 920
 921     switch (dc) {
 922         case SkXfermode::kOne_Coeff:
 923         case SkXfermode::kISA_Coeff:
 924         case SkXfermode::kISC_Coeff:
 925             return true;
 926         default:
 927             return false;
 928     }
 929 }
 930
 931 bool SkDrawTreatAAStrokeAsHairline(SkScalar strokeWidth, const SkMatrix& matrix,
 932                                    SkScalar* coverage) {
 933     SkASSERT(strokeWidth > 0);
 934     // We need to try to fake a thick-stroke with a modulated hairline.
 935
 936     if (matrix.hasPerspective()) {
 937         return false;
 938     }
 939
 940     SkVector src[2], dst[2];
 941     src[0].set(strokeWidth, 0);
 942     src[1].set(0, strokeWidth);
 943     matrix.mapVectors(dst, src, 2);
 944     SkScalar len0 = fast_len(dst[0]);
 945     SkScalar len1 = fast_len(dst[1]);
 946     if (len0 <= SK_Scalar1 && len1 <= SK_Scalar1) {
 947         if (coverage) {
 948             *coverage = SkScalarAve(len0, len1);
 949         }
 950         return true;
 951     }
 952     return false;
 953 }
 954
 955 void SkDraw::drawRRect(const SkRRect& rrect, const SkPaint& paint) const {
 956     SkDEBUGCODE(this->validate());
 957
 958     if (fRC->isEmpty()) {
 959         return;
 960     }
 961
 962     {
 963         // TODO: Investigate optimizing these options. They are in the same
 964         // order as SkDraw::drawPath, which handles each case. It may be
 965         // that there is no way to optimize for these using the SkRRect path.
 966         SkScalar coverage;
 967         if (SkDrawTreatAsHairline(paint, *fMatrix, &coverage)) {
 968             goto DRAW_PATH;
 969         }
 970
 971         if (paint.getPathEffect() || paint.getStyle() != SkPaint::kFill_Style) {
 972             goto DRAW_PATH;
 973         }
 974
 975         if (paint.getRasterizer()) {
 976             goto DRAW_PATH;
 977         }
 978     }
 979
 980     if (paint.getMaskFilter()) {
 981         // Transform the rrect into device space.
 982         SkRRect devRRect;
 983         if (rrect.transform(*fMatrix, &devRRect)) {
 984             SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, paint);
 985             if (paint.getMaskFilter()->filterRRect(devRRect, *fMatrix, *fRC, blitter.get(),
 986                                                    SkPaint::kFill_Style)) {
 987                 return; // filterRRect() called the blitter, so we're done
 988             }
 989         }
 990     }
 991
 992 DRAW_PATH:
 993     // Now fall back to the default case of using a path.
 994     SkPath path;
 995     path.addRRect(rrect);
 996     this->drawPath(path, paint, NULL, true);
 997 }
 998
 999 void SkDraw::drawPath(const SkPath& origSrcPath, const SkPaint& origPaint,
1000                       const SkMatrix* prePathMatrix, bool pathIsMutable,
1001                       bool drawCoverage, SkBlitter* customBlitter) const {
1002     SkDEBUGCODE(this->validate();)
1003
1004     // nothing to draw
1005     if (fRC->isEmpty()) {
1006         return;
1007     }
1008
1009     SkPath*         pathPtr = (SkPath*)&origSrcPath;
1010     bool            doFill = true;
1011     SkPath          tmpPath;
1012     SkMatrix        tmpMatrix;
1013     const SkMatrix* matrix = fMatrix;
1014
1015     if (prePathMatrix) {
1016         if (origPaint.getPathEffect() || origPaint.getStyle() != SkPaint::kFill_Style ||
1017                 origPaint.getRasterizer()) {
1018             SkPath* result = pathPtr;
1019
1020             if (!pathIsMutable) {
1021                 result = &tmpPath;
1022                 pathIsMutable = true;
1023             }
1024             pathPtr->transform(*prePathMatrix, result);
1025             pathPtr = result;
1026         } else {
1027             tmpMatrix.setConcat(*matrix, *prePathMatrix);
1028             matrix = &tmpMatrix;
1029         }
1030     }
1031     // at this point we're done with prePathMatrix
1032     SkDEBUGCODE(prePathMatrix = (const SkMatrix*)0x50FF8001;)
1033
1034     SkTCopyOnFirstWrite<SkPaint> paint(origPaint);
1035
1036     {
1037         SkScalar coverage;
1038         if (SkDrawTreatAsHairline(origPaint, *matrix, &coverage)) {
1039             if (SK_Scalar1 == coverage) {
1040                 paint.writable()->setStrokeWidth(0);
1041             } else if (xfermodeSupportsCoverageAsAlpha(origPaint.getXfermode())) {
1042                 U8CPU newAlpha;
1043 #if 0
1044                 newAlpha = SkToU8(SkScalarRoundToInt(coverage *
1045                                                      origPaint.getAlpha()));
1046 #else
1047                 // this is the old technique, which we preserve for now so
1048                 // we don't change previous results (testing)
1049                 // the new way seems fine, its just (a tiny bit) different
1050                 int scale = (int)SkScalarMul(coverage, 256);
1051                 newAlpha = origPaint.getAlpha() * scale >> 8;
1052 #endif
1053                 SkPaint* writablePaint = paint.writable();
1054                 writablePaint->setStrokeWidth(0);
1055                 writablePaint->setAlpha(newAlpha);
1056             }
1057         }
1058     }
1059
1060     if (paint->getPathEffect() || paint->getStyle() != SkPaint::kFill_Style) {
1061         SkRect cullRect;
1062         const SkRect* cullRectPtr = NULL;
1063         if (this->computeConservativeLocalClipBounds(&cullRect)) {
1064             cullRectPtr = &cullRect;
1065         }
1066         doFill = paint->getFillPath(*pathPtr, &tmpPath, cullRectPtr);
1067         pathPtr = &tmpPath;
1068     }
1069
1070     if (paint->getRasterizer()) {
1071         SkMask  mask;
1072         if (paint->getRasterizer()->rasterize(*pathPtr, *matrix,
1073                             &fRC->getBounds(), paint->getMaskFilter(), &mask,
1074                             SkMask::kComputeBoundsAndRenderImage_CreateMode)) {
1075             this->drawDevMask(mask, *paint);
1076             SkMask::FreeImage(mask.fImage);
1077         }
1078         return;
1079     }
1080
1081     // avoid possibly allocating a new path in transform if we can
1082     SkPath* devPathPtr = pathIsMutable ? pathPtr : &tmpPath;
1083
1084     // transform the path into device space
1085     pathPtr->transform(*matrix, devPathPtr);
1086
1087     SkBlitter* blitter = NULL;
1088     SkAutoBlitterChoose blitterStorage;
1089     if (NULL == customBlitter) {
1090         blitterStorage.choose(*fBitmap, *fMatrix, *paint, drawCoverage);
1091         blitter = blitterStorage.get();
1092     } else {
1093         blitter = customBlitter;
1094     }
1095
1096     if (paint->getMaskFilter()) {
1097         SkPaint::Style style = doFill ? SkPaint::kFill_Style :
1098             SkPaint::kStroke_Style;
1099         if (paint->getMaskFilter()->filterPath(*devPathPtr, *fMatrix, *fRC, blitter, style)) {
1100             return; // filterPath() called the blitter, so we're done
1101         }
1102     }
1103
1104     void (*proc)(const SkPath&, const SkRasterClip&, SkBlitter*);
1105     if (doFill) {
1106         if (paint->isAntiAlias()) {
1107             proc = SkScan::AntiFillPath;
1108         } else {
1109             proc = SkScan::FillPath;
1110         }
1111     } else {    // hairline
1112         if (paint->isAntiAlias()) {
1113             proc = SkScan::AntiHairPath;
1114         } else {
1115             proc = SkScan::HairPath;
1116         }
1117     }
1118     proc(*devPathPtr, *fRC, blitter);
1119 }
1120
1121 /** For the purposes of drawing bitmaps, if a matrix is "almost" translate
1122     go ahead and treat it as if it were, so that subsequent code can go fast.
1123  */
1124 static bool just_translate(const SkMatrix& matrix, const SkBitmap& bitmap) {
1125     unsigned bits = 0;  // TODO: find a way to allow the caller to tell us to
1126                         // respect filtering.
1127     return SkTreatAsSprite(matrix, bitmap.width(), bitmap.height(), bits);
1128 }
1129
1130 void SkDraw::drawBitmapAsMask(const SkBitmap& bitmap,
1131                               const SkPaint& paint) const {
1132     SkASSERT(bitmap.colorType() == kAlpha_8_SkColorType);
1133
1134     if (just_translate(*fMatrix, bitmap)) {
1135         int ix = SkScalarRoundToInt(fMatrix->getTranslateX());
1136         int iy = SkScalarRoundToInt(fMatrix->getTranslateY());
1137
1138         SkAutoLockPixels alp(bitmap);
1139         if (!bitmap.readyToDraw()) {
1140             return;
1141         }
1142
1143         SkMask  mask;
1144         mask.fBounds.set(ix, iy, ix + bitmap.width(), iy + bitmap.height());
1145         mask.fFormat = SkMask::kA8_Format;
1146         mask.fRowBytes = SkToU32(bitmap.rowBytes());
1147         mask.fImage = bitmap.getAddr8(0, 0);
1148
1149         this->drawDevMask(mask, paint);
1150     } else {    // need to xform the bitmap first
1151         SkRect  r;
1152         SkMask  mask;
1153
1154         r.set(0, 0,
1155               SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height()));
1156         fMatrix->mapRect(&r);
1157         r.round(&mask.fBounds);
1158
1159         // set the mask's bounds to the transformed bitmap-bounds,
1160         // clipped to the actual device
1161         {
1162             SkIRect    devBounds;
1163             devBounds.set(0, 0, fBitmap->width(), fBitmap->height());
1164             // need intersect(l, t, r, b) on irect
1165             if (!mask.fBounds.intersect(devBounds)) {
1166                 return;
1167             }
1168         }
1169
1170         mask.fFormat = SkMask::kA8_Format;
1171         mask.fRowBytes = SkAlign4(mask.fBounds.width());
1172         size_t size = mask.computeImageSize();
1173         if (0 == size) {
1174             // the mask is too big to allocated, draw nothing
1175             return;
1176         }
1177
1178         // allocate (and clear) our temp buffer to hold the transformed bitmap
1179         SkAutoMalloc    storage(size);
1180         mask.fImage = (uint8_t*)storage.get();
1181         memset(mask.fImage, 0, size);
1182
1183         // now draw our bitmap(src) into mask(dst), transformed by the matrix
1184         {
1185             SkBitmap    device;
1186             device.installPixels(SkImageInfo::MakeA8(mask.fBounds.width(), mask.fBounds.height()),
1187                                  mask.fImage, mask.fRowBytes);
1188
1189             SkCanvas c(device);
1190             // need the unclipped top/left for the translate
1191             c.translate(-SkIntToScalar(mask.fBounds.fLeft),
1192                         -SkIntToScalar(mask.fBounds.fTop));
1193             c.concat(*fMatrix);
1194
1195             // We can't call drawBitmap, or we'll infinitely recurse. Instead
1196             // we manually build a shader and draw that into our new mask
1197             SkPaint tmpPaint;
1198             tmpPaint.setFlags(paint.getFlags());
1199             SkAutoBitmapShaderInstall install(bitmap, tmpPaint);
1200             SkRect rr;
1201             rr.set(0, 0, SkIntToScalar(bitmap.width()),
1202                    SkIntToScalar(bitmap.height()));
1203             c.drawRect(rr, install.paintWithShader());
1204         }
1205         this->drawDevMask(mask, paint);
1206     }
1207 }
1208
1209 static bool clipped_out(const SkMatrix& m, const SkRasterClip& c,
1210                         const SkRect& srcR) {
1211     SkRect  dstR;
1212     SkIRect devIR;
1213
1214     m.mapRect(&dstR, srcR);
1215     dstR.roundOut(&devIR);
1216     return c.quickReject(devIR);
1217 }
1218
1219 static bool clipped_out(const SkMatrix& matrix, const SkRasterClip& clip,
1220                         int width, int height) {
1221     SkRect  r;
1222     r.set(0, 0, SkIntToScalar(width), SkIntToScalar(height));
1223     return clipped_out(matrix, clip, r);
1224 }
1225
1226 static bool clipHandlesSprite(const SkRasterClip& clip, int x, int y,
1227                               const SkBitmap& bitmap) {
1228     return clip.isBW() ||
1229            clip.quickContains(x, y, x + bitmap.width(), y + bitmap.height());
1230 }
1231
1232 void SkDraw::drawBitmap(const SkBitmap& bitmap, const SkMatrix& prematrix,
1233                         const SkPaint& origPaint) const {
1234     SkDEBUGCODE(this->validate();)
1235
1236     // nothing to draw
1237     if (fRC->isEmpty() ||
1238             bitmap.width() == 0 || bitmap.height() == 0 ||
1239             bitmap.colorType() == kUnknown_SkColorType) {
1240         return;
1241     }
1242
1243     SkPaint paint(origPaint);
1244     paint.setStyle(SkPaint::kFill_Style);
1245
1246     SkMatrix matrix;
1247     matrix.setConcat(*fMatrix, prematrix);
1248
1249     if (clipped_out(matrix, *fRC, bitmap.width(), bitmap.height())) {
1250         return;
1251     }
1252
1253     if (bitmap.colorType() != kAlpha_8_SkColorType && just_translate(matrix, bitmap)) {
1254         //
1255         // It is safe to call lock pixels now, since we know the matrix is
1256         // (more or less) identity.
1257         //
1258         SkAutoLockPixels alp(bitmap);
1259         if (!bitmap.readyToDraw()) {
1260             return;
1261         }
1262         int ix = SkScalarRoundToInt(matrix.getTranslateX());
1263         int iy = SkScalarRoundToInt(matrix.getTranslateY());
1264         if (clipHandlesSprite(*fRC, ix, iy, bitmap)) {
1265             SkTBlitterAllocator allocator;
1266             // blitter will be owned by the allocator.
1267             SkBlitter* blitter = SkBlitter::ChooseSprite(*fBitmap, paint, bitmap,
1268                                                          ix, iy, &allocator);
1269             if (blitter) {
1270                 SkIRect    ir;
1271                 ir.set(ix, iy, ix + bitmap.width(), iy + bitmap.height());
1272
1273                 SkScan::FillIRect(ir, *fRC, blitter);
1274                 return;
1275             }
1276         }
1277     }
1278
1279     // now make a temp draw on the stack, and use it
1280     //
1281     SkDraw draw(*this);
1282     draw.fMatrix = &matrix;
1283
1284     if (bitmap.colorType() == kAlpha_8_SkColorType) {
1285         draw.drawBitmapAsMask(bitmap, paint);
1286     } else {
1287         SkAutoBitmapShaderInstall install(bitmap, paint);
1288
1289         SkRect  r;
1290         r.set(0, 0, SkIntToScalar(bitmap.width()),
1291               SkIntToScalar(bitmap.height()));
1292         // is this ok if paint has a rasterizer?
1293         draw.drawRect(r, install.paintWithShader());
1294     }
1295 }
1296
1297 void SkDraw::drawSprite(const SkBitmap& bitmap, int x, int y,
1298                         const SkPaint& origPaint) const {
1299     SkDEBUGCODE(this->validate();)
1300
1301     // nothing to draw
1302     if (fRC->isEmpty() ||
1303             bitmap.width() == 0 || bitmap.height() == 0 ||
1304             bitmap.colorType() == kUnknown_SkColorType) {
1305         return;
1306     }
1307
1308     SkIRect    bounds;
1309     bounds.set(x, y, x + bitmap.width(), y + bitmap.height());
1310
1311     if (fRC->quickReject(bounds)) {
1312         return; // nothing to draw
1313     }
1314
1315     SkPaint paint(origPaint);
1316     paint.setStyle(SkPaint::kFill_Style);
1317
1318     if (NULL == paint.getColorFilter() && clipHandlesSprite(*fRC, x, y, bitmap)) {
1319         SkTBlitterAllocator allocator;
1320         // blitter will be owned by the allocator.
1321         SkBlitter* blitter = SkBlitter::ChooseSprite(*fBitmap, paint, bitmap,
1322                                                      x, y, &allocator);
1323
1324         if (blitter) {
1325             SkScan::FillIRect(bounds, *fRC, blitter);
1326             return;
1327         }
1328     }
1329
1330     SkMatrix        matrix;
1331     SkRect          r;
1332
1333     // get a scalar version of our rect
1334     r.set(bounds);
1335
1336     // create shader with offset
1337     matrix.setTranslate(r.fLeft, r.fTop);
1338     SkAutoBitmapShaderInstall install(bitmap, paint, &matrix);
1339     const SkPaint& shaderPaint = install.paintWithShader();
1340
1341     SkDraw draw(*this);
1342     matrix.reset();
1343     draw.fMatrix = &matrix;
1344     // call ourself with a rect
1345     // is this OK if paint has a rasterizer?
1346     draw.drawRect(r, shaderPaint);
1347 }
1348
1349 ///////////////////////////////////////////////////////////////////////////////
1350
1351 #include "SkScalerContext.h"
1352 #include "SkGlyphCache.h"
1353 #include "SkTextToPathIter.h"
1354 #include "SkUtils.h"
1355
1356 static void measure_text(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
1357                 const char text[], size_t byteLength, SkVector* stopVector) {
1358     SkFixed     x = 0, y = 0;
1359     const char* stop = text + byteLength;
1360
1361     SkAutoKern  autokern;
1362
1363     while (text < stop) {
1364         // don't need x, y here, since all subpixel variants will have the
1365         // same advance
1366         const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
1367
1368         x += autokern.adjust(glyph) + glyph.fAdvanceX;
1369         y += glyph.fAdvanceY;
1370     }
1371     stopVector->set(SkFixedToScalar(x), SkFixedToScalar(y));
1372
1373     SkASSERT(text == stop);
1374 }
1375
1376 bool SkDraw::ShouldDrawTextAsPaths(const SkPaint& paint, const SkMatrix& ctm) {
1377     // hairline glyphs are fast enough so we don't need to cache them
1378     if (SkPaint::kStroke_Style == paint.getStyle() && 0 == paint.getStrokeWidth()) {
1379         return true;
1380     }
1381
1382     // we don't cache perspective
1383     if (ctm.hasPerspective()) {
1384         return true;
1385     }
1386
1387     SkMatrix textM;
1388     return SkPaint::TooBigToUseCache(ctm, *paint.setTextMatrix(&textM));
1389 }
1390
1391 void SkDraw::drawText_asPaths(const char text[], size_t byteLength,
1392                               SkScalar x, SkScalar y,
1393                               const SkPaint& paint) const {
1394     SkDEBUGCODE(this->validate();)
1395
1396     SkTextToPathIter iter(text, byteLength, paint, true);
1397
1398     SkMatrix    matrix;
1399     matrix.setScale(iter.getPathScale(), iter.getPathScale());
1400     matrix.postTranslate(x, y);
1401
1402     const SkPath* iterPath;
1403     SkScalar xpos, prevXPos = 0;
1404
1405     while (iter.next(&iterPath, &xpos)) {
1406         matrix.postTranslate(xpos - prevXPos, 0);
1407         if (iterPath) {
1408             const SkPaint& pnt = iter.getPaint();
1409             if (fDevice) {
1410                 fDevice->drawPath(*this, *iterPath, pnt, &matrix, false);
1411             } else {
1412                 this->drawPath(*iterPath, pnt, &matrix, false);
1413             }
1414         }
1415         prevXPos = xpos;
1416     }
1417 }
1418
1419 // disable warning : local variable used without having been initialized
1420 #if defined _WIN32 && _MSC_VER >= 1300
1421 #pragma warning ( push )
1422 #pragma warning ( disable : 4701 )
1423 #endif
1424
1425 //////////////////////////////////////////////////////////////////////////////
1426
1427 static void D1G_RectClip(const SkDraw1Glyph& state, SkFixed fx, SkFixed fy, const SkGlyph& glyph) {
1428     int left = SkFixedFloorToInt(fx);
1429     int top = SkFixedFloorToInt(fy);
1430     SkASSERT(glyph.fWidth > 0 && glyph.fHeight > 0);
1431     SkASSERT((NULL == state.fClip && state.fAAClip) ||
1432              (state.fClip && NULL == state.fAAClip && state.fClip->isRect()));
1433
1434     left += glyph.fLeft;
1435     top  += glyph.fTop;
1436
1437     int right   = left + glyph.fWidth;
1438     int bottom  = top + glyph.fHeight;
1439
1440     SkMask        mask;
1441     SkIRect        storage;
1442     SkIRect*    bounds = &mask.fBounds;
1443
1444     mask.fBounds.set(left, top, right, bottom);
1445
1446     // this extra test is worth it, assuming that most of the time it succeeds
1447     // since we can avoid writing to storage
1448     if (!state.fClipBounds.containsNoEmptyCheck(left, top, right, bottom)) {
1449         if (!storage.intersectNoEmptyCheck(mask.fBounds, state.fClipBounds))
1450             return;
1451         bounds = &storage;
1452     }
1453
1454     uint8_t* aa = (uint8_t*)glyph.fImage;
1455     if (NULL == aa) {
1456         aa = (uint8_t*)state.fCache->findImage(glyph);
1457         if (NULL == aa) {
1458             return; // can't rasterize glyph
1459         }
1460     }
1461
1462     mask.fRowBytes = glyph.rowBytes();
1463     mask.fFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
1464     mask.fImage = aa;
1465     state.blitMask(mask, *bounds);
1466 }
1467
1468 static void D1G_RgnClip(const SkDraw1Glyph& state, SkFixed fx, SkFixed fy, const SkGlyph& glyph) {
1469     int left = SkFixedFloorToInt(fx);
1470     int top = SkFixedFloorToInt(fy);
1471     SkASSERT(glyph.fWidth > 0 && glyph.fHeight > 0);
1472     SkASSERT(!state.fClip->isRect());
1473
1474     SkMask  mask;
1475
1476     left += glyph.fLeft;
1477     top  += glyph.fTop;
1478
1479     mask.fBounds.set(left, top, left + glyph.fWidth, top + glyph.fHeight);
1480     SkRegion::Cliperator clipper(*state.fClip, mask.fBounds);
1481
1482     if (!clipper.done()) {
1483         const SkIRect&  cr = clipper.rect();
1484         const uint8_t*  aa = (const uint8_t*)glyph.fImage;
1485         if (NULL == aa) {
1486             aa = (uint8_t*)state.fCache->findImage(glyph);
1487             if (NULL == aa) {
1488                 return;
1489             }
1490         }
1491
1492         mask.fRowBytes = glyph.rowBytes();
1493         mask.fFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
1494         mask.fImage = (uint8_t*)aa;
1495         do {
1496             state.blitMask(mask, cr);
1497             clipper.next();
1498         } while (!clipper.done());
1499     }
1500 }
1501
1502 static bool hasCustomD1GProc(const SkDraw& draw) {
1503     return draw.fProcs && draw.fProcs->fD1GProc;
1504 }
1505
1506 static bool needsRasterTextBlit(const SkDraw& draw) {
1507     return !hasCustomD1GProc(draw);
1508 }
1509
1510 SkDraw1Glyph::Proc SkDraw1Glyph::init(const SkDraw* draw, SkBlitter* blitter, SkGlyphCache* cache,
1511                                       const SkPaint& pnt) {
1512     fDraw = draw;
1513     fBlitter = blitter;
1514     fCache = cache;
1515     fPaint = &pnt;
1516
1517     if (cache->isSubpixel()) {
1518         fHalfSampleX = fHalfSampleY = (SK_FixedHalf >> SkGlyph::kSubBits);
1519     } else {
1520         fHalfSampleX = fHalfSampleY = SK_FixedHalf;
1521     }
1522
1523     if (hasCustomD1GProc(*draw)) {
1524         // todo: fix this assumption about clips w/ custom
1525         fClip = draw->fClip;
1526         fClipBounds = fClip->getBounds();
1527         return draw->fProcs->fD1GProc;
1528     }
1529
1530     if (draw->fRC->isBW()) {
1531         fAAClip = NULL;
1532         fClip = &draw->fRC->bwRgn();
1533         fClipBounds = fClip->getBounds();
1534         if (fClip->isRect()) {
1535             return D1G_RectClip;
1536         } else {
1537             return D1G_RgnClip;
1538         }
1539     } else {    // aaclip
1540         fAAClip = &draw->fRC->aaRgn();
1541         fClip = NULL;
1542         fClipBounds = fAAClip->getBounds();
1543         return D1G_RectClip;
1544     }
1545 }
1546
1547 void SkDraw1Glyph::blitMaskAsSprite(const SkMask& mask) const {
1548     SkASSERT(SkMask::kARGB32_Format == mask.fFormat);
1549
1550     SkBitmap bm;
1551     bm.installPixels(SkImageInfo::MakeN32Premul(mask.fBounds.width(), mask.fBounds.height()),
1552                      (SkPMColor*)mask.fImage, mask.fRowBytes);
1553
1554     fDraw->drawSprite(bm, mask.fBounds.x(), mask.fBounds.y(), *fPaint);
1555 }
1556
1557 ///////////////////////////////////////////////////////////////////////////////
1558
1559 void SkDraw::drawText(const char text[], size_t byteLength,
1560                       SkScalar x, SkScalar y, const SkPaint& paint) const {
1561     SkASSERT(byteLength == 0 || text != NULL);
1562
1563     SkDEBUGCODE(this->validate();)
1564
1565     // nothing to draw
1566     if (text == NULL || byteLength == 0 || fRC->isEmpty()) {
1567         return;
1568     }
1569
1570     // SkScalarRec doesn't currently have a way of representing hairline stroke and
1571     // will fill if its frame-width is 0.
1572     if (ShouldDrawTextAsPaths(paint, *fMatrix)) {
1573         this->drawText_asPaths(text, byteLength, x, y, paint);
1574         return;
1575     }
1576
1577     SkDrawCacheProc glyphCacheProc = paint.getDrawCacheProc();
1578
1579     SkAutoGlyphCache    autoCache(paint, &fDevice->getLeakyProperties(), fMatrix);
1580     SkGlyphCache*       cache = autoCache.getCache();
1581
1582     // transform our starting point
1583     {
1584         SkPoint loc;
1585         fMatrix->mapXY(x, y, &loc);
1586         x = loc.fX;
1587         y = loc.fY;
1588     }
1589
1590     // need to measure first
1591     if (paint.getTextAlign() != SkPaint::kLeft_Align) {
1592         SkVector    stop;
1593
1594         measure_text(cache, glyphCacheProc, text, byteLength, &stop);
1595
1596         SkScalar    stopX = stop.fX;
1597         SkScalar    stopY = stop.fY;
1598
1599         if (paint.getTextAlign() == SkPaint::kCenter_Align) {
1600             stopX = SkScalarHalf(stopX);
1601             stopY = SkScalarHalf(stopY);
1602         }
1603         x -= stopX;
1604         y -= stopY;
1605     }
1606
1607     const char* stop = text + byteLength;
1608
1609     SkAAClipBlitter     aaBlitter;
1610     SkAutoBlitterChoose blitterChooser;
1611     SkBlitter*          blitter = NULL;
1612     if (needsRasterTextBlit(*this)) {
1613         blitterChooser.choose(*fBitmap, *fMatrix, paint);
1614         blitter = blitterChooser.get();
1615         if (fRC->isAA()) {
1616             aaBlitter.init(blitter, &fRC->aaRgn());
1617             blitter = &aaBlitter;
1618         }
1619     }
1620
1621     SkAutoKern          autokern;
1622     SkDraw1Glyph        d1g;
1623     SkDraw1Glyph::Proc  proc = d1g.init(this, blitter, cache, paint);
1624
1625     SkFixed fxMask = ~0;
1626     SkFixed fyMask = ~0;
1627     if (cache->isSubpixel()) {
1628         SkAxisAlignment baseline = SkComputeAxisAlignmentForHText(*fMatrix);
1629         if (kX_SkAxisAlignment == baseline) {
1630             fyMask = 0;
1631             d1g.fHalfSampleY = SK_FixedHalf;
1632         } else if (kY_SkAxisAlignment == baseline) {
1633             fxMask = 0;
1634             d1g.fHalfSampleX = SK_FixedHalf;
1635         }
1636     }
1637
1638     SkFixed fx = SkScalarToFixed(x) + d1g.fHalfSampleX;
1639     SkFixed fy = SkScalarToFixed(y) + d1g.fHalfSampleY;
1640
1641     while (text < stop) {
1642         const SkGlyph& glyph = glyphCacheProc(cache, &text, fx & fxMask, fy & fyMask);
1643
1644         fx += autokern.adjust(glyph);
1645
1646         if (glyph.fWidth) {
1647             proc(d1g, fx, fy, glyph);
1648         }
1649
1650         fx += glyph.fAdvanceX;
1651         fy += glyph.fAdvanceY;
1652     }
1653 }
1654
1655 //////////////////////////////////////////////////////////////////////////////
1656
1657 void SkDraw::drawPosText_asPaths(const char text[], size_t byteLength,
1658                                  const SkScalar pos[], SkScalar constY,
1659                                  int scalarsPerPosition,
1660                                  const SkPaint& origPaint) const {
1661     // setup our std paint, in hopes of getting hits in the cache
1662     SkPaint paint(origPaint);
1663     SkScalar matrixScale = paint.setupForAsPaths();
1664
1665     SkMatrix matrix;
1666     matrix.setScale(matrixScale, matrixScale);
1667
1668     // Temporarily jam in kFill, so we only ever ask for the raw outline from the cache.
1669     paint.setStyle(SkPaint::kFill_Style);
1670     paint.setPathEffect(NULL);
1671
1672     SkDrawCacheProc     glyphCacheProc = paint.getDrawCacheProc();
1673     SkAutoGlyphCache    autoCache(paint, NULL, NULL);
1674     SkGlyphCache*       cache = autoCache.getCache();
1675
1676     const char*        stop = text + byteLength;
1677     SkTextAlignProcScalar alignProc(paint.getTextAlign());
1678     SkTextMapStateProc tmsProc(SkMatrix::I(), constY, scalarsPerPosition);
1679
1680     // Now restore the original settings, so we "draw" with whatever style/stroking.
1681     paint.setStyle(origPaint.getStyle());
1682     paint.setPathEffect(origPaint.getPathEffect());
1683
1684     while (text < stop) {
1685         const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
1686         if (glyph.fWidth) {
1687             const SkPath* path = cache->findPath(glyph);
1688             if (path) {
1689                 SkPoint tmsLoc;
1690                 tmsProc(pos, &tmsLoc);
1691                 SkPoint loc;
1692                 alignProc(tmsLoc, glyph, &loc);
1693
1694                 matrix[SkMatrix::kMTransX] = loc.fX;
1695                 matrix[SkMatrix::kMTransY] = loc.fY;
1696                 if (fDevice) {
1697                     fDevice->drawPath(*this, *path, paint, &matrix, false);
1698                 } else {
1699                     this->drawPath(*path, paint, &matrix, false);
1700                 }
1701             }
1702         }
1703         pos += scalarsPerPosition;
1704     }
1705 }
1706
1707 void SkDraw::drawPosText(const char text[], size_t byteLength,
1708                          const SkScalar pos[], SkScalar constY,
1709                          int scalarsPerPosition, const SkPaint& paint) const {
1710     SkASSERT(byteLength == 0 || text != NULL);
1711     SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
1712
1713     SkDEBUGCODE(this->validate();)
1714
1715     // nothing to draw
1716     if (text == NULL || byteLength == 0 || fRC->isEmpty()) {
1717         return;
1718     }
1719
1720     if (ShouldDrawTextAsPaths(paint, *fMatrix)) {
1721         this->drawPosText_asPaths(text, byteLength, pos, constY,
1722                                   scalarsPerPosition, paint);
1723         return;
1724     }
1725
1726     SkDrawCacheProc     glyphCacheProc = paint.getDrawCacheProc();
1727     SkAutoGlyphCache    autoCache(paint, &fDevice->getLeakyProperties(), fMatrix);
1728     SkGlyphCache*       cache = autoCache.getCache();
1729
1730     SkAAClipBlitterWrapper wrapper;
1731     SkAutoBlitterChoose blitterChooser;
1732     SkBlitter* blitter = NULL;
1733     if (needsRasterTextBlit(*this)) {
1734         blitterChooser.choose(*fBitmap, *fMatrix, paint);
1735         blitter = blitterChooser.get();
1736         if (fRC->isAA()) {
1737             wrapper.init(*fRC, blitter);
1738             blitter = wrapper.getBlitter();
1739         }
1740     }
1741
1742     const char*        stop = text + byteLength;
1743     SkTextAlignProc    alignProc(paint.getTextAlign());
1744     SkDraw1Glyph       d1g;
1745     SkDraw1Glyph::Proc proc = d1g.init(this, blitter, cache, paint);
1746     SkTextMapStateProc tmsProc(*fMatrix, constY, scalarsPerPosition);
1747
1748     if (cache->isSubpixel()) {
1749         // maybe we should skip the rounding if linearText is set
1750         SkAxisAlignment baseline = SkComputeAxisAlignmentForHText(*fMatrix);
1751
1752         SkFixed fxMask = ~0;
1753         SkFixed fyMask = ~0;
1754         if (kX_SkAxisAlignment == baseline) {
1755             fyMask = 0;
1756 #ifndef SK_IGNORE_SUBPIXEL_AXIS_ALIGN_FIX
1757             d1g.fHalfSampleY = SK_FixedHalf;
1758 #endif
1759         } else if (kY_SkAxisAlignment == baseline) {
1760             fxMask = 0;
1761 #ifndef SK_IGNORE_SUBPIXEL_AXIS_ALIGN_FIX
1762             d1g.fHalfSampleX = SK_FixedHalf;
1763 #endif
1764         }
1765
1766         if (SkPaint::kLeft_Align == paint.getTextAlign()) {
1767             while (text < stop) {
1768                 SkPoint tmsLoc;
1769                 tmsProc(pos, &tmsLoc);
1770                 SkFixed fx = SkScalarToFixed(tmsLoc.fX) + d1g.fHalfSampleX;
1771                 SkFixed fy = SkScalarToFixed(tmsLoc.fY) + d1g.fHalfSampleY;
1772
1773                 const SkGlyph& glyph = glyphCacheProc(cache, &text,
1774                                                       fx & fxMask, fy & fyMask);
1775
1776                 if (glyph.fWidth) {
1777                     proc(d1g, fx, fy, glyph);
1778                 }
1779                 pos += scalarsPerPosition;
1780             }
1781         } else {
1782             while (text < stop) {
1783                 const char* currentText = text;
1784                 const SkGlyph& metricGlyph = glyphCacheProc(cache, &text, 0, 0);
1785
1786                 if (metricGlyph.fWidth) {
1787                     SkDEBUGCODE(SkFixed prevAdvX = metricGlyph.fAdvanceX;)
1788                     SkDEBUGCODE(SkFixed prevAdvY = metricGlyph.fAdvanceY;)
1789                     SkPoint tmsLoc;
1790                     tmsProc(pos, &tmsLoc);
1791                     SkIPoint fixedLoc;
1792                     alignProc(tmsLoc, metricGlyph, &fixedLoc);
1793
1794                     SkFixed fx = fixedLoc.fX + d1g.fHalfSampleX;
1795                     SkFixed fy = fixedLoc.fY + d1g.fHalfSampleY;
1796
1797                     // have to call again, now that we've been "aligned"
1798                     const SkGlyph& glyph = glyphCacheProc(cache, &currentText,
1799                                                           fx & fxMask, fy & fyMask);
1800                     // the assumption is that the metrics haven't changed
1801                     SkASSERT(prevAdvX == glyph.fAdvanceX);
1802                     SkASSERT(prevAdvY == glyph.fAdvanceY);
1803                     SkASSERT(glyph.fWidth);
1804
1805                     proc(d1g, fx, fy, glyph);
1806                 }
1807                 pos += scalarsPerPosition;
1808             }
1809         }
1810     } else {    // not subpixel
1811         if (SkPaint::kLeft_Align == paint.getTextAlign()) {
1812             while (text < stop) {
1813                 // the last 2 parameters are ignored
1814                 const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
1815
1816                 if (glyph.fWidth) {
1817                     SkPoint tmsLoc;
1818                     tmsProc(pos, &tmsLoc);
1819
1820                     proc(d1g,
1821                          SkScalarToFixed(tmsLoc.fX) + SK_FixedHalf, //d1g.fHalfSampleX,
1822                          SkScalarToFixed(tmsLoc.fY) + SK_FixedHalf, //d1g.fHalfSampleY,
1823                          glyph);
1824                 }
1825                 pos += scalarsPerPosition;
1826             }
1827         } else {
1828             while (text < stop) {
1829                 // the last 2 parameters are ignored
1830                 const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
1831
1832                 if (glyph.fWidth) {
1833                     SkPoint tmsLoc;
1834                     tmsProc(pos, &tmsLoc);
1835
1836                     SkIPoint fixedLoc;
1837                     alignProc(tmsLoc, glyph, &fixedLoc);
1838
1839                     proc(d1g,
1840                          fixedLoc.fX + SK_FixedHalf, //d1g.fHalfSampleX,
1841                          fixedLoc.fY + SK_FixedHalf, //d1g.fHalfSampleY,
1842                          glyph);
1843                 }
1844                 pos += scalarsPerPosition;
1845             }
1846         }
1847     }
1848 }
1849
1850 #if defined _WIN32 && _MSC_VER >= 1300
1851 #pragma warning ( pop )
1852 #endif
1853
1854 ///////////////////////////////////////////////////////////////////////////////
1855
1856 #include "SkPathMeasure.h"
1857
1858 static void morphpoints(SkPoint dst[], const SkPoint src[], int count,
1859                         SkPathMeasure& meas, const SkMatrix& matrix) {
1860     SkMatrix::MapXYProc proc = matrix.getMapXYProc();
1861
1862     for (int i = 0; i < count; i++) {
1863         SkPoint pos;
1864         SkVector tangent;
1865
1866         proc(matrix, src[i].fX, src[i].fY, &pos);
1867         SkScalar sx = pos.fX;
1868         SkScalar sy = pos.fY;
1869
1870         if (!meas.getPosTan(sx, &pos, &tangent)) {
1871             // set to 0 if the measure failed, so that we just set dst == pos
1872             tangent.set(0, 0);
1873         }
1874
1875         /*  This is the old way (that explains our approach but is way too slow
1876             SkMatrix    matrix;
1877             SkPoint     pt;
1878
1879             pt.set(sx, sy);
1880             matrix.setSinCos(tangent.fY, tangent.fX);
1881             matrix.preTranslate(-sx, 0);
1882             matrix.postTranslate(pos.fX, pos.fY);
1883             matrix.mapPoints(&dst[i], &pt, 1);
1884         */
1885         dst[i].set(pos.fX - SkScalarMul(tangent.fY, sy),
1886                    pos.fY + SkScalarMul(tangent.fX, sy));
1887     }
1888 }
1889
1890 /*  TODO
1891
1892     Need differentially more subdivisions when the follow-path is curvy. Not sure how to
1893     determine that, but we need it. I guess a cheap answer is let the caller tell us,
1894     but that seems like a cop-out. Another answer is to get Rob Johnson to figure it out.
1895 */
1896 static void morphpath(SkPath* dst, const SkPath& src, SkPathMeasure& meas,
1897                       const SkMatrix& matrix) {
1898     SkPath::Iter    iter(src, false);
1899     SkPoint         srcP[4], dstP[3];
1900     SkPath::Verb    verb;
1901
1902     while ((verb = iter.next(srcP)) != SkPath::kDone_Verb) {
1903         switch (verb) {
1904             case SkPath::kMove_Verb:
1905                 morphpoints(dstP, srcP, 1, meas, matrix);
1906                 dst->moveTo(dstP[0]);
1907                 break;
1908             case SkPath::kLine_Verb:
1909                 // turn lines into quads to look bendy
1910                 srcP[0].fX = SkScalarAve(srcP[0].fX, srcP[1].fX);
1911                 srcP[0].fY = SkScalarAve(srcP[0].fY, srcP[1].fY);
1912                 morphpoints(dstP, srcP, 2, meas, matrix);
1913                 dst->quadTo(dstP[0], dstP[1]);
1914                 break;
1915             case SkPath::kQuad_Verb:
1916                 morphpoints(dstP, &srcP[1], 2, meas, matrix);
1917                 dst->quadTo(dstP[0], dstP[1]);
1918                 break;
1919             case SkPath::kCubic_Verb:
1920                 morphpoints(dstP, &srcP[1], 3, meas, matrix);
1921                 dst->cubicTo(dstP[0], dstP[1], dstP[2]);
1922                 break;
1923             case SkPath::kClose_Verb:
1924                 dst->close();
1925                 break;
1926             default:
1927                 SkDEBUGFAIL("unknown verb");
1928                 break;
1929         }
1930     }
1931 }
1932
1933 void SkDraw::drawTextOnPath(const char text[], size_t byteLength,
1934                             const SkPath& follow, const SkMatrix* matrix,
1935                             const SkPaint& paint) const {
1936     SkASSERT(byteLength == 0 || text != NULL);
1937
1938     // nothing to draw
1939     if (text == NULL || byteLength == 0 || fRC->isEmpty()) {
1940         return;
1941     }
1942
1943     SkTextToPathIter    iter(text, byteLength, paint, true);
1944     SkPathMeasure       meas(follow, false);
1945     SkScalar            hOffset = 0;
1946
1947     // need to measure first
1948     if (paint.getTextAlign() != SkPaint::kLeft_Align) {
1949         SkScalar pathLen = meas.getLength();
1950         if (paint.getTextAlign() == SkPaint::kCenter_Align) {
1951             pathLen = SkScalarHalf(pathLen);
1952         }
1953         hOffset += pathLen;
1954     }
1955
1956     const SkPath*   iterPath;
1957     SkScalar        xpos;
1958     SkMatrix        scaledMatrix;
1959     SkScalar        scale = iter.getPathScale();
1960
1961     scaledMatrix.setScale(scale, scale);
1962
1963     while (iter.next(&iterPath, &xpos)) {
1964         if (iterPath) {
1965             SkPath      tmp;
1966             SkMatrix    m(scaledMatrix);
1967
1968             m.postTranslate(xpos + hOffset, 0);
1969             if (matrix) {
1970                 m.postConcat(*matrix);
1971             }
1972             morphpath(&tmp, *iterPath, meas, m);
1973             if (fDevice) {
1974                 fDevice->drawPath(*this, tmp, iter.getPaint(), NULL, true);
1975             } else {
1976                 this->drawPath(tmp, iter.getPaint(), NULL, true);
1977             }
1978         }
1979     }
1980 }
1981
1982 ///////////////////////////////////////////////////////////////////////////////
1983
1984 typedef void (*HairProc)(const SkPoint&, const SkPoint&, const SkRasterClip&,
1985                          SkBlitter*);
1986
1987 static HairProc ChooseHairProc(bool doAntiAlias) {
1988     return doAntiAlias ? SkScan::AntiHairLine : SkScan::HairLine;
1989 }
1990
1991 static bool texture_to_matrix(const VertState& state, const SkPoint verts[],
1992                               const SkPoint texs[], SkMatrix* matrix) {
1993     SkPoint src[3], dst[3];
1994
1995     src[0] = texs[state.f0];
1996     src[1] = texs[state.f1];
1997     src[2] = texs[state.f2];
1998     dst[0] = verts[state.f0];
1999     dst[1] = verts[state.f1];
2000     dst[2] = verts[state.f2];
2001     return matrix->setPolyToPoly(src, dst, 3);
2002 }
2003
2004 class SkTriColorShader : public SkShader {
2005 public:
2006     SkTriColorShader() {}
2007
2008     virtual size_t contextSize() const SK_OVERRIDE;
2009
2010     class TriColorShaderContext : public SkShader::Context {
2011     public:
2012         TriColorShaderContext(const SkTriColorShader& shader, const ContextRec&);
2013         virtual ~TriColorShaderContext();
2014
2015         bool setup(const SkPoint pts[], const SkColor colors[], int, int, int);
2016
2017         virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE;
2018
2019     private:
2020         SkMatrix    fDstToUnit;
2021         SkPMColor   fColors[3];
2022
2023         typedef SkShader::Context INHERITED;
2024     };
2025
2026     SK_TO_STRING_OVERRIDE()
2027     SK_DECLARE_NOT_FLATTENABLE_PROCS(SkTriColorShader)
2028
2029 protected:
2030     virtual Context* onCreateContext(const ContextRec& rec, void* storage) const SK_OVERRIDE {
2031         return SkNEW_PLACEMENT_ARGS(storage, TriColorShaderContext, (*this, rec));
2032     }
2033
2034 private:
2035     typedef SkShader INHERITED;
2036 };
2037
2038 bool SkTriColorShader::TriColorShaderContext::setup(const SkPoint pts[], const SkColor colors[],
2039                                                     int index0, int index1, int index2) {
2040
2041     fColors[0] = SkPreMultiplyColor(colors[index0]);
2042     fColors[1] = SkPreMultiplyColor(colors[index1]);
2043     fColors[2] = SkPreMultiplyColor(colors[index2]);
2044
2045     SkMatrix m, im;
2046     m.reset();
2047     m.set(0, pts[index1].fX - pts[index0].fX);
2048     m.set(1, pts[index2].fX - pts[index0].fX);
2049     m.set(2, pts[index0].fX);
2050     m.set(3, pts[index1].fY - pts[index0].fY);
2051     m.set(4, pts[index2].fY - pts[index0].fY);
2052     m.set(5, pts[index0].fY);
2053     if (!m.invert(&im)) {
2054         return false;
2055     }
2056     // We can't call getTotalInverse(), because we explicitly don't want to look at the localmatrix
2057     // as our interators are intrinsically tied to the vertices, and nothing else.
2058     SkMatrix ctmInv;
2059     if (!this->getCTM().invert(&ctmInv)) {
2060         return false;
2061     }
2062     fDstToUnit.setConcat(im, ctmInv);
2063     return true;
2064 }
2065
2066 #include "SkColorPriv.h"
2067 #include "SkComposeShader.h"
2068
2069 static int ScalarTo256(SkScalar v) {
2070     int scale = SkScalarToFixed(v) >> 8;
2071     if (scale < 0) {
2072         scale = 0;
2073     }
2074     if (scale > 255) {
2075         scale = 255;
2076     }
2077     return SkAlpha255To256(scale);
2078 }
2079
2080
2081 SkTriColorShader::TriColorShaderContext::TriColorShaderContext(const SkTriColorShader& shader,
2082                                                                const ContextRec& rec)
2083     : INHERITED(shader, rec) {}
2084
2085 SkTriColorShader::TriColorShaderContext::~TriColorShaderContext() {}
2086
2087 size_t SkTriColorShader::contextSize() const {
2088     return sizeof(TriColorShaderContext);
2089 }
2090 void SkTriColorShader::TriColorShaderContext::shadeSpan(int x, int y, SkPMColor dstC[], int count) {
2091     const int alphaScale = Sk255To256(this->getPaintAlpha());
2092
2093     SkPoint src;
2094
2095     for (int i = 0; i < count; i++) {
2096         fDstToUnit.mapXY(SkIntToScalar(x), SkIntToScalar(y), &src);
2097         x += 1;
2098
2099         int scale1 = ScalarTo256(src.fX);
2100         int scale2 = ScalarTo256(src.fY);
2101         int scale0 = 256 - scale1 - scale2;
2102         if (scale0 < 0) {
2103             if (scale1 > scale2) {
2104                 scale2 = 256 - scale1;
2105             } else {
2106                 scale1 = 256 - scale2;
2107             }
2108             scale0 = 0;
2109         }
2110
2111         if (256 != alphaScale) {
2112             scale0 = SkAlphaMul(scale0, alphaScale);
2113             scale1 = SkAlphaMul(scale1, alphaScale);
2114             scale2 = SkAlphaMul(scale2, alphaScale);
2115         }
2116
2117         dstC[i] = SkAlphaMulQ(fColors[0], scale0) +
2118                   SkAlphaMulQ(fColors[1], scale1) +
2119                   SkAlphaMulQ(fColors[2], scale2);
2120     }
2121 }
2122
2123 #ifndef SK_IGNORE_TO_STRING
2124 void SkTriColorShader::toString(SkString* str) const {
2125     str->append("SkTriColorShader: (");
2126
2127     this->INHERITED::toString(str);
2128
2129     str->append(")");
2130 }
2131 #endif
2132
2133 void SkDraw::drawVertices(SkCanvas::VertexMode vmode, int count,
2134                           const SkPoint vertices[], const SkPoint textures[],
2135                           const SkColor colors[], SkXfermode* xmode,
2136                           const uint16_t indices[], int indexCount,
2137                           const SkPaint& paint) const {
2138     SkASSERT(0 == count || vertices);
2139
2140     // abort early if there is nothing to draw
2141     if (count < 3 || (indices && indexCount < 3) || fRC->isEmpty()) {
2142         return;
2143     }
2144
2145     // transform out vertices into device coordinates
2146     SkAutoSTMalloc<16, SkPoint> storage(count);
2147     SkPoint* devVerts = storage.get();
2148     fMatrix->mapPoints(devVerts, vertices, count);
2149
2150     /*
2151         We can draw the vertices in 1 of 4 ways:
2152
2153         - solid color (no shader/texture[], no colors[])
2154         - just colors (no shader/texture[], has colors[])
2155         - just texture (has shader/texture[], no colors[])
2156         - colors * texture (has shader/texture[], has colors[])
2157
2158         Thus for texture drawing, we need both texture[] and a shader.
2159     */
2160
2161     SkTriColorShader triShader; // must be above declaration of p
2162     SkPaint p(paint);
2163
2164     SkShader* shader = p.getShader();
2165     if (NULL == shader) {
2166         // if we have no shader, we ignore the texture coordinates
2167         textures = NULL;
2168     } else if (NULL == textures) {
2169         // if we don't have texture coordinates, ignore the shader
2170         p.setShader(NULL);
2171         shader = NULL;
2172     }
2173
2174     // setup the custom shader (if needed)
2175     SkAutoTUnref<SkComposeShader> composeShader;
2176     if (colors) {
2177         if (NULL == textures) {
2178             // just colors (no texture)
2179             shader = p.setShader(&triShader);
2180         } else {
2181             // colors * texture
2182             SkASSERT(shader);
2183             bool releaseMode = false;
2184             if (NULL == xmode) {
2185                 xmode = SkXfermode::Create(SkXfermode::kModulate_Mode);
2186                 releaseMode = true;
2187             }
2188             composeShader.reset(SkNEW_ARGS(SkComposeShader, (&triShader, shader, xmode)));
2189             p.setShader(composeShader);
2190             if (releaseMode) {
2191                 xmode->unref();
2192             }
2193         }
2194     }
2195
2196     SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, p);
2197     // Abort early if we failed to create a shader context.
2198     if (blitter->isNullBlitter()) {
2199         return;
2200     }
2201
2202     // setup our state and function pointer for iterating triangles
2203     VertState       state(count, indices, indexCount);
2204     VertState::Proc vertProc = state.chooseProc(vmode);
2205
2206     if (textures || colors) {
2207         while (vertProc(&state)) {
2208             if (textures) {
2209                 SkMatrix tempM;
2210                 if (texture_to_matrix(state, vertices, textures, &tempM)) {
2211                     SkShader::ContextRec rec(*fBitmap, p, *fMatrix);
2212                     rec.fLocalMatrix = &tempM;
2213                     if (!blitter->resetShaderContext(rec)) {
2214                         continue;
2215                     }
2216                 }
2217             }
2218             if (colors) {
2219                 // Find the context for triShader.
2220                 SkTriColorShader::TriColorShaderContext* triColorShaderContext;
2221
2222                 SkShader::Context* shaderContext = blitter->getShaderContext();
2223                 SkASSERT(shaderContext);
2224                 if (p.getShader() == &triShader) {
2225                     triColorShaderContext =
2226                             static_cast<SkTriColorShader::TriColorShaderContext*>(shaderContext);
2227                 } else {
2228                     // The shader is a compose shader and triShader is its first shader.
2229                     SkASSERT(p.getShader() == composeShader);
2230                     SkASSERT(composeShader->getShaderA() == &triShader);
2231                     SkComposeShader::ComposeShaderContext* composeShaderContext =
2232                             static_cast<SkComposeShader::ComposeShaderContext*>(shaderContext);
2233                     SkShader::Context* shaderContextA = composeShaderContext->getShaderContextA();
2234                     triColorShaderContext =
2235                             static_cast<SkTriColorShader::TriColorShaderContext*>(shaderContextA);
2236                 }
2237
2238                 if (!triColorShaderContext->setup(vertices, colors,
2239                                                   state.f0, state.f1, state.f2)) {
2240                     continue;
2241                 }
2242             }
2243
2244             SkPoint tmp[] = {
2245                 devVerts[state.f0], devVerts[state.f1], devVerts[state.f2]
2246             };
2247             SkScan::FillTriangle(tmp, *fRC, blitter.get());
2248         }
2249     } else {
2250         // no colors[] and no texture, stroke hairlines with paint's color.
2251         HairProc hairProc = ChooseHairProc(paint.isAntiAlias());
2252         const SkRasterClip& clip = *fRC;
2253         while (vertProc(&state)) {
2254             hairProc(devVerts[state.f0], devVerts[state.f1], clip, blitter.get());
2255             hairProc(devVerts[state.f1], devVerts[state.f2], clip, blitter.get());
2256             hairProc(devVerts[state.f2], devVerts[state.f0], clip, blitter.get());
2257         }
2258     }
2259 }
2260
2261 ///////////////////////////////////////////////////////////////////////////////
2262 ///////////////////////////////////////////////////////////////////////////////
2263
2264 #ifdef SK_DEBUG
2265
2266 void SkDraw::validate() const {
2267     SkASSERT(fBitmap != NULL);
2268     SkASSERT(fMatrix != NULL);
2269     SkASSERT(fClip != NULL);
2270     SkASSERT(fRC != NULL);
2271
2272     const SkIRect&  cr = fRC->getBounds();
2273     SkIRect         br;
2274
2275     br.set(0, 0, fBitmap->width(), fBitmap->height());
2276     SkASSERT(cr.isEmpty() || br.contains(cr));
2277 }
2278
2279 #endif
2280
2281 ////////////////////////////////////////////////////////////////////////////////////////////////
2282
2283 #include "SkPath.h"
2284 #include "SkDraw.h"
2285 #include "SkRegion.h"
2286 #include "SkBlitter.h"
2287
2288 static bool compute_bounds(const SkPath& devPath, const SkIRect* clipBounds,
2289                        const SkMaskFilter* filter, const SkMatrix* filterMatrix,
2290                            SkIRect* bounds) {
2291     if (devPath.isEmpty()) {
2292         return false;
2293     }
2294
2295     //  init our bounds from the path
2296     {
2297         SkRect pathBounds = devPath.getBounds();
2298         pathBounds.inset(-SK_ScalarHalf, -SK_ScalarHalf);
2299         pathBounds.roundOut(bounds);
2300     }
2301
2302     SkIPoint margin = SkIPoint::Make(0, 0);
2303     if (filter) {
2304         SkASSERT(filterMatrix);
2305
2306         SkMask srcM, dstM;
2307
2308         srcM.fBounds = *bounds;
2309         srcM.fFormat = SkMask::kA8_Format;
2310         srcM.fImage = NULL;
2311         if (!filter->filterMask(&dstM, srcM, *filterMatrix, &margin)) {
2312             return false;
2313         }
2314     }
2315
2316     // (possibly) trim the bounds to reflect the clip
2317     // (plus whatever slop the filter needs)
2318     if (clipBounds) {
2319         SkIRect tmp = *clipBounds;
2320         // Ugh. Guard against gigantic margins from wacky filters. Without this
2321         // check we can request arbitrary amounts of slop beyond our visible
2322         // clip, and bring down the renderer (at least on finite RAM machines
2323         // like handsets, etc.). Need to balance this invented value between
2324         // quality of large filters like blurs, and the corresponding memory
2325         // requests.
2326         static const int MAX_MARGIN = 128;
2327         tmp.inset(-SkMin32(margin.fX, MAX_MARGIN),
2328                   -SkMin32(margin.fY, MAX_MARGIN));
2329         if (!bounds->intersect(tmp)) {
2330             return false;
2331         }
2332     }
2333
2334     return true;
2335 }
2336
2337 static void draw_into_mask(const SkMask& mask, const SkPath& devPath,
2338                            SkPaint::Style style) {
2339     SkBitmap        bm;
2340     SkDraw          draw;
2341     SkRasterClip    clip;
2342     SkMatrix        matrix;
2343     SkPaint         paint;
2344
2345     bm.installPixels(SkImageInfo::MakeA8(mask.fBounds.width(), mask.fBounds.height()),
2346                      mask.fImage, mask.fRowBytes);
2347
2348     clip.setRect(SkIRect::MakeWH(mask.fBounds.width(), mask.fBounds.height()));
2349     matrix.setTranslate(-SkIntToScalar(mask.fBounds.fLeft),
2350                         -SkIntToScalar(mask.fBounds.fTop));
2351
2352     draw.fBitmap    = &bm;
2353     draw.fRC        = &clip;
2354     draw.fClip      = &clip.bwRgn();
2355     draw.fMatrix    = &matrix;
2356     paint.setAntiAlias(true);
2357     paint.setStyle(style);
2358     draw.drawPath(devPath, paint);
2359 }
2360
2361 bool SkDraw::DrawToMask(const SkPath& devPath, const SkIRect* clipBounds,
2362                         const SkMaskFilter* filter, const SkMatrix* filterMatrix,
2363                         SkMask* mask, SkMask::CreateMode mode,
2364                         SkPaint::Style style) {
2365     if (SkMask::kJustRenderImage_CreateMode != mode) {
2366         if (!compute_bounds(devPath, clipBounds, filter, filterMatrix, &mask->fBounds))
2367             return false;
2368     }
2369
2370     if (SkMask::kComputeBoundsAndRenderImage_CreateMode == mode) {
2371         mask->fFormat = SkMask::kA8_Format;
2372         mask->fRowBytes = mask->fBounds.width();
2373         size_t size = mask->computeImageSize();
2374         if (0 == size) {
2375             // we're too big to allocate the mask, abort
2376             return false;
2377         }
2378         mask->fImage = SkMask::AllocImage(size);
2379         memset(mask->fImage, 0, mask->computeImageSize());
2380     }
2381
2382     if (SkMask::kJustComputeBounds_CreateMode != mode) {
2383         draw_into_mask(*mask, devPath, style);
2384     }
2385
2386     return true;
2387 }