cc/raster/raster_buffer_provider.h

// 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.

#ifndef CC_RASTER_RASTER_BUFFER_PROVIDER_H_
#define CC_RASTER_RASTER_BUFFER_PROVIDER_H_

#include <stddef.h>

#include "cc/playback/raster_source.h"
#include "cc/raster/raster_buffer.h"
#include "cc/raster/task_graph_runner.h"
#include "cc/raster/tile_task.h"
#include "cc/resources/resource_format.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"

namespace base {
class SequencedTaskRunner;
}

namespace cc {
class Resource;

class CC_EXPORT RasterBufferProvider {
 public:
  RasterBufferProvider();
  virtual ~RasterBufferProvider();

  // Utility function that will create a temporary bitmap and copy pixels to
  // |memory| when necessary. The |canvas_bitmap_rect| is the rect of the bitmap
  // being played back in the pixel space of the source, ie a rect in the source
  // that will cover the resulting |memory|. The |canvas_playback_rect| can be a
  // smaller contained rect inside the |canvas_bitmap_rect| if the |memory| is
  // already partially complete, and only the subrect needs to be played back.
  static void PlaybackToMemory(
      void* memory,
      ResourceFormat format,
      const gfx::Size& size,
      size_t stride,
      const RasterSource* raster_source,
      const gfx::Rect& canvas_bitmap_rect,
      const gfx::Rect& canvas_playback_rect,
      float scale,
      const RasterSource::PlaybackSettings& playback_settings);

  // Acquire raster buffer.
  virtual std::unique_ptr<RasterBuffer> AcquireBufferForRaster(
      const Resource* resource,
      uint64_t resource_content_id,
      uint64_t previous_content_id) = 0;

  // Release raster buffer.
  virtual void ReleaseBufferForRaster(std::unique_ptr<RasterBuffer> buffer) = 0;

  // Used for syncing resources to the worker context. Returns false if barrier
  // could not be established.
  virtual bool OrderingBarrier() = 0;

  // Returns the format to use for the tiles.
  virtual ResourceFormat GetResourceFormat(bool must_support_alpha) const = 0;

  // Determine if the resource requires swizzling.
  virtual bool GetResourceRequiresSwizzle(bool must_support_alpha) const = 0;

  // Shutdown for doing cleanup.
  virtual void Shutdown() = 0;

 protected:
  // Check if resource format matches output format.
  static bool ResourceFormatRequiresSwizzle(ResourceFormat format);
};

}  // namespace cc

#endif  // CC_RASTER_RASTER_BUFFER_PROVIDER_H_