skia/ext/platform_canvas.cc

   1 // Copyright (c) 2011 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 "skia/ext/platform_canvas.h"
   6
   7 #include "skia/ext/bitmap_platform_device.h"
   8 #include "third_party/skia/include/core/SkTypes.h"
   9
  10 namespace skia {
  11
  12 SkBaseDevice* GetTopDevice(const SkCanvas& canvas) {
  13   return canvas.getTopDevice(true);
  14 }
  15
  16 bool SupportsPlatformPaint(const SkCanvas* canvas) {
  17   PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
  18   return platform_device && platform_device->SupportsPlatformPaint();
  19 }
  20
  21 PlatformSurface BeginPlatformPaint(SkCanvas* canvas) {
  22   PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
  23   if (platform_device)
  24     return platform_device->BeginPlatformPaint();
  25
  26   return 0;
  27 }
  28
  29 void EndPlatformPaint(SkCanvas* canvas) {
  30   PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
  31   if (platform_device)
  32     platform_device->EndPlatformPaint();
  33 }
  34
  35 void MakeOpaque(SkCanvas* canvas, int x, int y, int width, int height) {
  36   if (width <= 0 || height <= 0)
  37     return;
  38
  39   SkRect rect;
  40   rect.setXYWH(SkIntToScalar(x), SkIntToScalar(y),
  41                SkIntToScalar(width), SkIntToScalar(height));
  42   SkPaint paint;
  43   paint.setColor(SK_ColorBLACK);
  44   paint.setXfermodeMode(SkXfermode::kDstATop_Mode);
  45   canvas->drawRect(rect, paint);
  46 }
  47
  48 size_t PlatformCanvasStrideForWidth(unsigned width) {
  49   return 4 * width;
  50 }
  51
  52 SkCanvas* CreateCanvas(const skia::RefPtr<SkBaseDevice>& device, OnFailureType failureType) {
  53   if (!device) {
  54     if (CRASH_ON_FAILURE == failureType)
  55       SK_CRASH();
  56     return NULL;
  57   }
  58   return new SkCanvas(device.get());
  59 }
  60
  61 PlatformBitmap::PlatformBitmap() : surface_(0), platform_extra_(0) {}
  62
  63 }  // namespace skia