src/skia/ext/bitmap_platform_device_win.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 <windows.h>
   6 #include <psapi.h>
   7
   8 #include "base/debug/gdi_debug_util_win.h"
   9 #include "base/logging.h"
  10 #include "skia/ext/bitmap_platform_device_win.h"
  11 #include "skia/ext/platform_canvas.h"
  12 #include "third_party/skia/include/core/SkMatrix.h"
  13 #include "third_party/skia/include/core/SkRefCnt.h"
  14 #include "third_party/skia/include/core/SkRegion.h"
  15 #include "third_party/skia/include/core/SkUtils.h"
  16
  17 namespace {
  18
  19 HBITMAP CreateHBitmap(int width, int height, bool is_opaque,
  20                              HANDLE shared_section, void** data) {
  21   // CreateDIBSection appears to get unhappy if we create an empty bitmap, so
  22   // just create a minimal bitmap
  23   if ((width == 0) || (height == 0)) {
  24     width = 1;
  25     height = 1;
  26   }
  27
  28   BITMAPINFOHEADER hdr = {0};
  29   hdr.biSize = sizeof(BITMAPINFOHEADER);
  30   hdr.biWidth = width;
  31   hdr.biHeight = -height;  // minus means top-down bitmap
  32   hdr.biPlanes = 1;
  33   hdr.biBitCount = 32;
  34   hdr.biCompression = BI_RGB;  // no compression
  35   hdr.biSizeImage = 0;
  36   hdr.biXPelsPerMeter = 1;
  37   hdr.biYPelsPerMeter = 1;
  38   hdr.biClrUsed = 0;
  39   hdr.biClrImportant = 0;
  40
  41   HBITMAP hbitmap = CreateDIBSection(NULL, reinterpret_cast<BITMAPINFO*>(&hdr),
  42                                      0, data, shared_section, 0);
  43
  44 #if !defined(_WIN64)
  45   // If this call fails, we're gonna crash hard. Try to get some useful
  46   // information out before we crash for post-mortem analysis.
  47   if (!hbitmap)
  48     base::debug::GDIBitmapAllocFailure(&hdr, shared_section);
  49 #endif
  50
  51   return hbitmap;
  52 }
  53
  54 }  // namespace
  55
  56 namespace skia {
  57
  58 HDC BitmapPlatformDevice::GetBitmapDC() {
  59   if (!hdc_) {
  60     hdc_ = CreateCompatibleDC(NULL);
  61     InitializeDC(hdc_);
  62     old_hbitmap_ = static_cast<HBITMAP>(SelectObject(hdc_, hbitmap_));
  63   }
  64
  65   LoadConfig();
  66   return hdc_;
  67 }
  68
  69 void BitmapPlatformDevice::ReleaseBitmapDC() {
  70   SkASSERT(hdc_);
  71   SelectObject(hdc_, old_hbitmap_);
  72   DeleteDC(hdc_);
  73   hdc_ = NULL;
  74   old_hbitmap_ = NULL;
  75 }
  76
  77 bool BitmapPlatformDevice::IsBitmapDCCreated()
  78     const {
  79   return hdc_ != NULL;
  80 }
  81
  82
  83 void BitmapPlatformDevice::SetMatrixClip(
  84     const SkMatrix& transform,
  85     const SkRegion& region) {
  86   transform_ = transform;
  87   clip_region_ = region;
  88   config_dirty_ = true;
  89 }
  90
  91 void BitmapPlatformDevice::LoadConfig() {
  92   if (!config_dirty_ || !hdc_)
  93     return;  // Nothing to do.
  94   config_dirty_ = false;
  95
  96   // Transform.
  97   LoadTransformToDC(hdc_, transform_);
  98   LoadClippingRegionToDC(hdc_, clip_region_, transform_);
  99 }
 100
 101 static void DeleteHBitmapCallback(void* addr, void* context) {
 102   DeleteObject(static_cast<HBITMAP>(context));
 103 }
 104
 105 static bool InstallHBitmapPixels(SkBitmap* bitmap, int width, int height,
 106                                  bool is_opaque, void* data, HBITMAP hbitmap) {
 107   const SkAlphaType at = is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
 108   const SkImageInfo info = SkImageInfo::MakeN32(width, height, at);
 109   const size_t rowBytes = info.minRowBytes();
 110   SkColorTable* color_table = NULL;
 111   return bitmap->installPixels(info, data, rowBytes, color_table,
 112                                DeleteHBitmapCallback, hbitmap);
 113 }
 114
 115 // We use this static factory function instead of the regular constructor so
 116 // that we can create the pixel data before calling the constructor. This is
 117 // required so that we can call the base class' constructor with the pixel
 118 // data.
 119 BitmapPlatformDevice* BitmapPlatformDevice::Create(
 120     int width,
 121     int height,
 122     bool is_opaque,
 123     HANDLE shared_section) {
 124
 125   void* data;
 126   HBITMAP hbitmap = CreateHBitmap(width, height, is_opaque, shared_section,
 127                                   &data);
 128   if (!hbitmap)
 129     return NULL;
 130
 131   SkBitmap bitmap;
 132   if (!InstallHBitmapPixels(&bitmap, width, height, is_opaque, data, hbitmap))
 133     return NULL;
 134
 135 #ifndef NDEBUG
 136   // If we were given data, then don't clobber it!
 137   if (!shared_section && is_opaque)
 138     // To aid in finding bugs, we set the background color to something
 139     // obviously wrong so it will be noticable when it is not cleared
 140     bitmap.eraseARGB(255, 0, 255, 128);  // bright bluish green
 141 #endif
 142
 143   // The device object will take ownership of the HBITMAP. The initial refcount
 144   // of the data object will be 1, which is what the constructor expects.
 145   return new BitmapPlatformDevice(hbitmap, bitmap);
 146 }
 147
 148 // static
 149 BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
 150                                                    bool is_opaque) {
 151   return Create(width, height, is_opaque, NULL);
 152 }
 153
 154 // static
 155 BitmapPlatformDevice* BitmapPlatformDevice::CreateAndClear(int width,
 156                                                            int height,
 157                                                            bool is_opaque) {
 158   BitmapPlatformDevice* device = BitmapPlatformDevice::Create(width, height,
 159                                                               is_opaque);
 160   if (device && !is_opaque)
 161     device->clear(0);
 162   return device;
 163 }
 164
 165 // The device will own the HBITMAP, which corresponds to also owning the pixel
 166 // data. Therefore, we do not transfer ownership to the SkBitmapDevice's bitmap.
 167 BitmapPlatformDevice::BitmapPlatformDevice(
 168     HBITMAP hbitmap,
 169     const SkBitmap& bitmap)
 170     : SkBitmapDevice(bitmap),
 171       hbitmap_(hbitmap),
 172       old_hbitmap_(NULL),
 173       hdc_(NULL),
 174       config_dirty_(true),  // Want to load the config next time.
 175       transform_(SkMatrix::I()) {
 176   // The data object is already ref'ed for us by create().
 177   SkDEBUGCODE(begin_paint_count_ = 0);
 178   SetPlatformDevice(this, this);
 179   // Initialize the clip region to the entire bitmap.
 180   BITMAP bitmap_data;
 181   if (GetObject(hbitmap_, sizeof(BITMAP), &bitmap_data)) {
 182     SkIRect rect;
 183     rect.set(0, 0, bitmap_data.bmWidth, bitmap_data.bmHeight);
 184     clip_region_ = SkRegion(rect);
 185   }
 186 }
 187
 188 BitmapPlatformDevice::~BitmapPlatformDevice() {
 189   SkASSERT(begin_paint_count_ == 0);
 190   if (hdc_)
 191     ReleaseBitmapDC();
 192 }
 193
 194 HDC BitmapPlatformDevice::BeginPlatformPaint() {
 195   SkDEBUGCODE(begin_paint_count_++);
 196   return GetBitmapDC();
 197 }
 198
 199 void BitmapPlatformDevice::EndPlatformPaint() {
 200   SkASSERT(begin_paint_count_--);
 201   PlatformDevice::EndPlatformPaint();
 202 }
 203
 204 void BitmapPlatformDevice::setMatrixClip(const SkMatrix& transform,
 205                                          const SkRegion& region,
 206                                          const SkClipStack&) {
 207   SetMatrixClip(transform, region);
 208 }
 209
 210 void BitmapPlatformDevice::DrawToNativeContext(HDC dc, int x, int y,
 211                                                const RECT* src_rect) {
 212   bool created_dc = !IsBitmapDCCreated();
 213   HDC source_dc = BeginPlatformPaint();
 214
 215   RECT temp_rect;
 216   if (!src_rect) {
 217     temp_rect.left = 0;
 218     temp_rect.right = width();
 219     temp_rect.top = 0;
 220     temp_rect.bottom = height();
 221     src_rect = &temp_rect;
 222   }
 223
 224   int copy_width = src_rect->right - src_rect->left;
 225   int copy_height = src_rect->bottom - src_rect->top;
 226
 227   // We need to reset the translation for our bitmap or (0,0) won't be in the
 228   // upper left anymore
 229   SkMatrix identity;
 230   identity.reset();
 231
 232   LoadTransformToDC(source_dc, identity);
 233   if (isOpaque()) {
 234     BitBlt(dc,
 235            x,
 236            y,
 237            copy_width,
 238            copy_height,
 239            source_dc,
 240            src_rect->left,
 241            src_rect->top,
 242            SRCCOPY);
 243   } else {
 244     SkASSERT(copy_width != 0 && copy_height != 0);
 245     BLENDFUNCTION blend_function = {AC_SRC_OVER, 0, 255, AC_SRC_ALPHA};
 246     GdiAlphaBlend(dc,
 247                   x,
 248                   y,
 249                   copy_width,
 250                   copy_height,
 251                   source_dc,
 252                   src_rect->left,
 253                   src_rect->top,
 254                   copy_width,
 255                   copy_height,
 256                   blend_function);
 257   }
 258   LoadTransformToDC(source_dc, transform_);
 259
 260   EndPlatformPaint();
 261   if (created_dc)
 262     ReleaseBitmapDC();
 263 }
 264
 265 const SkBitmap& BitmapPlatformDevice::onAccessBitmap() {
 266   // FIXME(brettw) OPTIMIZATION: We should only flush if we know a GDI
 267   // operation has occurred on our DC.
 268   if (IsBitmapDCCreated())
 269     GdiFlush();
 270   return SkBitmapDevice::onAccessBitmap();
 271 }
 272
 273 SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const SkImageInfo& info,
 274                                                    Usage /*usage*/) {
 275   SkASSERT(info.colorType() == kN32_SkColorType);
 276   return BitmapPlatformDevice::CreateAndClear(info.width(), info.height(),
 277                                               info.isOpaque());
 278 }
 279
 280 // PlatformCanvas impl
 281
 282 SkCanvas* CreatePlatformCanvas(int width,
 283                                int height,
 284                                bool is_opaque,
 285                                HANDLE shared_section,
 286                                OnFailureType failureType) {
 287   skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef(
 288       BitmapPlatformDevice::Create(width, height, is_opaque, shared_section));
 289   return CreateCanvas(dev, failureType);
 290 }
 291
 292 // Port of PlatformBitmap to win
 293
 294 PlatformBitmap::~PlatformBitmap() {
 295   if (surface_) {
 296     if (platform_extra_)
 297       SelectObject(surface_, reinterpret_cast<HGDIOBJ>(platform_extra_));
 298     DeleteDC(surface_);
 299   }
 300 }
 301
 302 bool PlatformBitmap::Allocate(int width, int height, bool is_opaque) {
 303   void* data;
 304   HBITMAP hbitmap = CreateHBitmap(width, height, is_opaque, 0, &data);
 305   if (!hbitmap)
 306     return false;
 307
 308   surface_ = CreateCompatibleDC(NULL);
 309   InitializeDC(surface_);
 310   // When the memory DC is created, its display surface is exactly one
 311   // monochrome pixel wide and one monochrome pixel high. Save this object
 312   // off, we'll restore it just before deleting the memory DC.
 313   HGDIOBJ stock_bitmap = SelectObject(surface_, hbitmap);
 314   platform_extra_ = reinterpret_cast<intptr_t>(stock_bitmap);
 315
 316   if (!InstallHBitmapPixels(&bitmap_, width, height, is_opaque, data, hbitmap))
 317     return false;
 318   bitmap_.lockPixels();
 319
 320   return true;
 321 }
 322
 323 }  // namespace skia