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.tryAllocN32Pixels(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::Create(int width, int height,
  24                                                    bool is_opaque,
  25                                                    uint8_t* data) {
  26   SkBitmap bitmap;
  27   bitmap.setInfo(SkImageInfo::MakeN32(width, height,
  28       is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType));
  29   if (data)
  30     bitmap.setPixels(data);
  31   else if (!bitmap.tryAllocPixels())
  32     return NULL;
  33
  34   return new BitmapPlatformDevice(bitmap);
  35 }
  36
  37 BitmapPlatformDevice::BitmapPlatformDevice(const SkBitmap& bitmap)
  38     : SkBitmapDevice(bitmap) {
  39   SetPlatformDevice(this, this);
  40 }
  41
  42 BitmapPlatformDevice::~BitmapPlatformDevice() {
  43 }
  44
  45 SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const CreateInfo& info,
  46                                                    const SkPaint*) {
  47   SkASSERT(info.fInfo.colorType() == kN32_SkColorType);
  48   return BitmapPlatformDevice::Create(info.fInfo.width(), info.fInfo.height(),
  49                                       info.fInfo.isOpaque());
  50 }
  51
  52 PlatformSurface BitmapPlatformDevice::BeginPlatformPaint() {
  53   // TODO(zhenghao): What should we return? The ptr to the address of the
  54   // pixels? Maybe this won't be called at all.
  55   return accessBitmap(true).getPixels();
  56 }
  57
  58 // PlatformCanvas impl
  59
  60 SkCanvas* CreatePlatformCanvas(int width, int height, bool is_opaque,
  61                                uint8_t* data, OnFailureType failureType) {
  62   skia::RefPtr<SkBaseDevice> dev = skia::AdoptRef(
  63       BitmapPlatformDevice::Create(width, height, is_opaque, data));
  64   return CreateCanvas(dev, failureType);
  65 }
  66
  67 // Port of PlatformBitmap to android
  68 PlatformBitmap::~PlatformBitmap() {
  69   // Nothing to do.
  70 }
  71
  72 bool PlatformBitmap::Allocate(int width, int height, bool is_opaque) {
  73   if (!bitmap_.tryAllocN32Pixels(width, height, is_opaque))
  74     return false;
  75
  76   surface_ = bitmap_.getPixels();
  77   return true;
  78 }
  79
  80 }  // namespace skia