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   if (bitmap.allocN32Pixels(width, height, is_opaque)) {
  14     // Follow the logic in SkCanvas::createDevice(), initialize the bitmap if it
  15     // is not opaque.
  16     if (!is_opaque)
  17       bitmap.eraseARGB(0, 0, 0, 0);
  18     return new BitmapPlatformDevice(bitmap);
  19   }
  20   return NULL;
  21 }
  22
  23 BitmapPlatformDevice* BitmapPlatformDevice::CreateAndClear(int width,
  24                                                            int height,
  25                                                            bool is_opaque) {
  26   BitmapPlatformDevice* device = Create(width, height, is_opaque);
  27   if (!is_opaque)
  28     device->clear(0);
  29   return device;
  30 }
  31
  32 BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
  33                                                    bool is_opaque,
  34                                                    uint8_t* data) {
  35   SkBitmap bitmap;
  36   bitmap.setInfo(SkImageInfo::MakeN32(width, height,
  37       is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType));
  38   if (data)
  39     bitmap.setPixels(data);
  40   else if (!bitmap.allocPixels())
  41     return NULL;
  42
  43   return new BitmapPlatformDevice(bitmap);
  44 }
  45
  46 BitmapPlatformDevice::BitmapPlatformDevice(const SkBitmap& bitmap)
  47     : SkBitmapDevice(bitmap) {
  48   SetPlatformDevice(this, this);
  49 }
  50
  51 BitmapPlatformDevice::~BitmapPlatformDevice() {
  52 }
  53
  54 SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const SkImageInfo& info,
  55                                                    Usage /*usage*/) {
  56   SkASSERT(info.colorType() == kN32_SkColorType);
  57   return BitmapPlatformDevice::Create(info.width(), info.height(),
  58                                       info.isOpaque());
  59 }
  60
  61 PlatformSurface BitmapPlatformDevice::BeginPlatformPaint() {
  62   // TODO(zhenghao): What should we return? The ptr to the address of the
  63   // pixels? Maybe this won't be called at all.
  64   return accessBitmap(true).getPixels();
  65 }
  66
  67 void BitmapPlatformDevice::DrawToNativeContext(
  68     PlatformSurface surface, int x, int y, const PlatformRect* src_rect) {
  69   // Should never be called on Android.
  70   SkASSERT(false);
  71 }
  72
  73 // PlatformCanvas impl
  74
  75 SkCanvas* CreatePlatformCanvas(int width, int height, bool is_opaque,
  76                                uint8_t* data, OnFailureType failureType) {
  77   skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef(
  78       BitmapPlatformDevice::Create(width, height, is_opaque, data));
  79   return CreateCanvas(dev, failureType);
  80 }
  81
  82 // Port of PlatformBitmap to android
  83 PlatformBitmap::~PlatformBitmap() {
  84   // Nothing to do.
  85 }
  86
  87 bool PlatformBitmap::Allocate(int width, int height, bool is_opaque) {
  88   if (!bitmap_.allocN32Pixels(width, height, is_opaque))
  89     return false;
  90
  91   surface_ = bitmap_.getPixels();
  92   return true;
  93 }
  94
  95 }  // namespace skia