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      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::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.tryAllocPixels())
     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_.tryAllocN32Pixels(width, height, is_opaque))
     89     return false;
     90 
     91   surface_ = bitmap_.getPixels();
     92   return true;
     93 }
     94 
     95 }  // namespace skia
     96