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/raster/raster_buffer.h"
#include "cc/raster/raster_source.h"
#include "cc/raster/task_graph_runner.h"
#include "cc/raster/tile_task.h"
#include "cc/resources/resource_pool.h"
#include "components/viz/common/resources/resource_format.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"

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.
  // Set |gpu_compositing| to true if the compositor is using gpu, as we respect
  // the format more accurately, vs in software compositing where the format is
  // a placeholder for the skia native format.
  static void PlaybackToMemory(
      void* memory,
      viz::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,
      const gfx::AxisTransform2d& transform,
      const gfx::ColorSpace& target_color_space,
      bool gpu_compositing,
      const RasterSource::PlaybackSettings& playback_settings);

  // Acquire raster buffer.
  virtual std::unique_ptr<RasterBuffer> AcquireBufferForRaster(
      const ResourcePool::InUsePoolResource& resource,
      uint64_t resource_content_id,
      uint64_t previous_content_id,
      bool depends_on_at_raster_decodes,
      bool depends_on_hardware_accelerated_jpeg_candidates,
      bool depends_on_hardware_accelerated_webp_candidates) = 0;

  // Flush pending work from writing the content of the RasterBuffer, so that
  // queries to tell if the backing is ready to draw from will get the right
  // answer. This should be done before calling IsResourceReadyToDraw() or
  // SetReadyToDrawCallback().
  virtual void Flush() = 0;

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

  // Determines if the resource is premultiplied.
  virtual bool IsResourcePremultiplied() const = 0;

  // Determine if the RasterBufferProvider can handle partial raster into
  // the Resource provided in AcquireBufferForRaster.
  virtual bool CanPartialRasterIntoProvidedResource() const = 0;

  // Returns true if the indicated resource is ready to draw.
  virtual bool IsResourceReadyToDraw(
      const ResourcePool::InUsePoolResource& resource) const = 0;

  // Calls the provided |callback| when the provided |resources| are ready to
  // draw. Returns a callback ID which can be used to track this callback.
  // Will return 0 if no callback is needed (resources are already ready to
  // draw). The caller may optionally pass the ID of a pending callback to
  // avoid creating a new callback unnecessarily. If the caller does not
  // have a pending callback, 0 should be passed for |pending_callback_id|.
  virtual uint64_t SetReadyToDrawCallback(
      const std::vector<const ResourcePool::InUsePoolResource*>& resources,
      base::OnceClosure callback,
      uint64_t pending_callback_id) const = 0;

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

  // Checks whether GPU side queries issued for previous raster work have been
  // finished. Note that this will acquire the worker context lock so it can be
  // used from any thread. But usage from the compositor thread should be
  // avoided to prevent contention with worker threads.
  // Returns true if there are pending queries that could not be completed in
  // this check.
  virtual bool CheckRasterFinishedQueries() = 0;
};

}  // namespace cc

#endif  // CC_RASTER_RASTER_BUFFER_PROVIDER_H_