WIP RasterCanvasLayerAllocator experiment 2

skia/ext/bitmap_platform_device_skia.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "skia/ext/bitmap_platform_device_skia.h"
-#include "skia/ext/platform_canvas.h"
-
-namespace skia {
-
-BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
-                                                   bool is_opaque) {
-  SkBitmap bitmap;
-  if (bitmap.tryAllocN32Pixels(width, height, is_opaque)) {
-    // Follow the logic in SkCanvas::createDevice(), initialize the bitmap if it
-    // is not opaque.
-    if (!is_opaque)
-      bitmap.eraseARGB(0, 0, 0, 0);
-    return new BitmapPlatformDevice(bitmap);
-  }
-  return NULL;
-}
-
-BitmapPlatformDevice* BitmapPlatformDevice::Create(int width, int height,
-                                                   bool is_opaque,
-                                                   uint8_t* data) {
-  SkBitmap bitmap;
-  bitmap.setInfo(SkImageInfo::MakeN32(width, height,
-      is_opaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType));
-  if (data)
-    bitmap.setPixels(data);
-  else if (!bitmap.tryAllocPixels())
-    return NULL;
-
-  return new BitmapPlatformDevice(bitmap);
-}
-
-BitmapPlatformDevice::BitmapPlatformDevice(const SkBitmap& bitmap)
-    : SkBitmapDevice(bitmap) {
-  SetPlatformDevice(this, this);
-}
-
-BitmapPlatformDevice::~BitmapPlatformDevice() {
-}
-
-SkBaseDevice* BitmapPlatformDevice::onCreateDevice(const CreateInfo& info,
-                                                   const SkPaint*) {
-  SkASSERT(info.fInfo.colorType() == kN32_SkColorType);
-  return BitmapPlatformDevice::Create(info.fInfo.width(), info.fInfo.height(),
-                                      info.fInfo.isOpaque());
-}
-
-PlatformSurface BitmapPlatformDevice::BeginPlatformPaint(const SkMatrix& transform,
-                                                         const SkIRect& clip_bounds) {
-  // TODO(zhenghao): What should we return? The ptr to the address of the
-  // pixels? Maybe this won't be called at all.
-  SkPixmap pixmap;
-  return accessPixels(&pixmap) ? pixmap.writable_addr() : nullptr;
-}
-
-// PlatformCanvas impl
-
-SkCanvas* CreatePlatformCanvas(int width, int height, bool is_opaque,
-                               uint8_t* data, OnFailureType failureType) {
-  sk_sp<SkBaseDevice> dev(
-      BitmapPlatformDevice::Create(width, height, is_opaque, data));
-  return CreateCanvas(dev, failureType);
-}
-
-}  // namespace skia