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      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 DrawToNativeContext(SkCanvas* canvas, PlatformSurface context, int x,
     36                          int y, const PlatformRect* src_rect) {
     37   PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
     38   if (platform_device)
     39     platform_device->DrawToNativeContext(context, x, y, src_rect);
     40 }
     41 
     42 void MakeOpaque(SkCanvas* canvas, int x, int y, int width, int height) {
     43   if (width <= 0 || height <= 0)
     44     return;
     45 
     46   SkRect rect;
     47   rect.setXYWH(SkIntToScalar(x), SkIntToScalar(y),
     48                SkIntToScalar(width), SkIntToScalar(height));
     49   SkPaint paint;
     50   paint.setColor(SK_ColorBLACK);
     51   paint.setXfermodeMode(SkXfermode::kDstATop_Mode);
     52   canvas->drawRect(rect, paint);
     53 }
     54 
     55 size_t PlatformCanvasStrideForWidth(unsigned width) {
     56   return 4 * width;
     57 }
     58 
     59 SkCanvas* CreateCanvas(const skia::RefPtr<SkBaseDevice>& device, OnFailureType failureType) {
     60   if (!device) {
     61     if (CRASH_ON_FAILURE == failureType)
     62       SK_CRASH();
     63     return NULL;
     64   }
     65   return new SkCanvas(device.get());
     66 }
     67 
     68 PlatformBitmap::PlatformBitmap() : surface_(0), platform_extra_(0) {}
     69 
     70 }  // namespace skia
     71