skia/ext/bitmap_platform_device_skia.cc

   1 // Copyright 2013 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/bitmap_platform_device_skia.h"
   6 #include "skia/ext/platform_canvas.h"
   7
   8 namespace skia {
   9
  10 BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
  11                                                    bool is_opaque) {
  12   SkBitmap bitmap;
  13   bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height, 0,
  14                    is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
  15   if (bitmap.allocPixels()) {
  16     // Follow the logic in SkCanvas::createDevice(), initialize the bitmap if it
  17     // is not opaque.
  18     if (!is_opaque)
  19       bitmap.eraseARGB(0, 0, 0, 0);
  20     return new BitmapPlatformDevice(bitmap);
  21   }
  22   return NULL;
  23 }
  24
  25 BitmapPlatformDevice* BitmapPlatformDevice::CreateAndClear(int width,
  26                                                            int height,
  27                                                            bool is_opaque) {
  28   BitmapPlatformDevice* device = Create(width, height, is_opaque);
  29   if (!is_opaque)
  30     device->clear(0);
  31   return device;
  32 }
  33
  34 BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
  35                                                    bool is_opaque,
  36                                                    uint8_t* data) {
  37   SkBitmap bitmap;
  38   bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height, 0,
  39                    is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
  40   if (data)
  41     bitmap.setPixels(data);
  42   else if (!bitmap.allocPixels())
  43     return NULL;
  44
  45   return new BitmapPlatformDevice(bitmap);
  46 }
  47
  48 BitmapPlatformDevice::BitmapPlatformDevice(const SkBitmap& bitmap)
  49     : SkBitmapDevice(bitmap) {
  50   SetPlatformDevice(this, this);
  51 }
  52
  53 BitmapPlatformDevice::~BitmapPlatformDevice() {
  54 }
  55
  56 SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const SkImageInfo& info,
  57                                                    Usage /*usage*/) {
  58   SkASSERT(info.colorType() == kPMColor_SkColorType);
  59   return BitmapPlatformDevice::Create(info.width(), info.height(),
  60                                       info.isOpaque());
  61 }
  62
  63 PlatformSurface BitmapPlatformDevice::BeginPlatformPaint() {
  64   // TODO(zhenghao): What should we return? The ptr to the address of the
  65   // pixels? Maybe this won't be called at all.
  66   return accessBitmap(true).getPixels();
  67 }
  68
  69 void BitmapPlatformDevice::DrawToNativeContext(
  70     PlatformSurface surface, int x, int y, const PlatformRect* src_rect) {
  71   // Should never be called on Android.
  72   SkASSERT(false);
  73 }
  74
  75 // PlatformCanvas impl
  76
  77 SkCanvas* CreatePlatformCanvas(int width, int height, bool is_opaque,
  78                                uint8_t* data, OnFailureType failureType) {
  79   skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef(
  80       BitmapPlatformDevice::Create(width, height, is_opaque, data));
  81   return CreateCanvas(dev, failureType);
  82 }
  83
  84 // Port of PlatformBitmap to android
  85 PlatformBitmap::~PlatformBitmap() {
  86   // Nothing to do.
  87 }
  88
  89 bool PlatformBitmap::Allocate(int width, int height, bool is_opaque) {
  90   bitmap_.setConfig(SkBitmap::kARGB_8888_Config, width, height, 0,
  91                     is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType);
  92   if (!bitmap_.allocPixels())
  93     return false;
  94
  95   surface_ = bitmap_.getPixels();
  96   return true;
  97 }
  98
  99 }  // namespace skia