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// Copyright 2014 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_PLAYBACK_DISPLAY_LIST_RASTER_SOURCE_H_
#define CC_PLAYBACK_DISPLAY_LIST_RASTER_SOURCE_H_
#include <stddef.h>
#include <vector>
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/thread_checker.h"
#include "base/trace_event/memory_allocator_dump.h"
#include "base/trace_event/memory_dump_provider.h"
#include "cc/base/cc_export.h"
#include "cc/debug/rendering_stats_instrumentation.h"
#include "cc/playback/display_list_recording_source.h"
#include "skia/ext/analysis_canvas.h"
#include "skia/ext/refptr.h"
#include "third_party/skia/include/core/SkPicture.h"
namespace cc {
class DisplayItemList;
class DrawImage;
class ImageDecodeController;
class CC_EXPORT DisplayListRasterSource
: public base::trace_event::MemoryDumpProvider,
public base::RefCountedThreadSafe<DisplayListRasterSource> {
public:
static scoped_refptr<DisplayListRasterSource>
CreateFromDisplayListRecordingSource(const DisplayListRecordingSource* other,
bool can_use_lcd_text);
// Raster a subrect of this RasterSource into the given canvas. It is
// assumed that contents_scale has already been applied to this canvas.
// Writes the total number of pixels rasterized and the time spent
// rasterizing to the stats if the respective pointer is not nullptr.
// It is assumed that the canvas passed here will only be rasterized by
// this raster source via this call.
//
// Virtual for testing.
//
// Note that this should only be called after the image decode controller has
// been set, which happens during commit.
virtual void PlaybackToCanvas(SkCanvas* canvas,
const gfx::Rect& canvas_bitmap_rect,
const gfx::Rect& canvas_playback_rect,
float contents_scale,
bool include_images) const;
// Similar to above, except that the canvas passed here can (or was already)
// rasterized into by another raster source. That is, it is not safe to clear
// the canvas or discard its underlying memory.
void PlaybackToSharedCanvas(SkCanvas* canvas,
const gfx::Rect& canvas_rect,
float contents_scale,
bool include_images) const;
// Returns whether the given rect at given scale is of solid color in
// this raster source, as well as the solid color value.
bool PerformSolidColorAnalysis(const gfx::Rect& content_rect,
float contents_scale,
SkColor* color) const;
// Returns true iff the whole raster source is of solid color.
bool IsSolidColor() const;
// Returns the color of the raster source if it is solid color. The results
// are unspecified if IsSolidColor returns false.
SkColor GetSolidColor() const;
// Returns the size of this raster source.
gfx::Size GetSize() const;
// Populate the given list with all images that may overlap the given
// rect in layer space. The returned draw images' matrices are modified as if
// they were being using during raster at scale |raster_scale|.
void GetDiscardableImagesInRect(const gfx::Rect& layer_rect,
float raster_scale,
std::vector<DrawImage>* images) const;
// Return true iff this raster source can raster the given rect in layer
// space.
bool CoversRect(const gfx::Rect& layer_rect) const;
// Returns true if this raster source has anything to rasterize.
virtual bool HasRecordings() const;
// Valid rectangle in which everything is recorded and can be rastered from.
virtual gfx::Rect RecordedViewport() const;
// Informs the raster source that it should attempt to use distance field text
// during rasterization.
virtual void SetShouldAttemptToUseDistanceFieldText();
// Return true iff this raster source would benefit from using distance
// field text.
virtual bool ShouldAttemptToUseDistanceFieldText() const;
// Tracing functionality.
virtual void DidBeginTracing();
virtual void AsValueInto(base::trace_event::TracedValue* array) const;
virtual skia::RefPtr<SkPicture> GetFlattenedPicture();
virtual size_t GetPictureMemoryUsage() const;
// Return true if LCD anti-aliasing may be used when rastering text.
virtual bool CanUseLCDText() const;
scoped_refptr<DisplayListRasterSource> CreateCloneWithoutLCDText() const;
// Image decode controller should be set once. Its lifetime has to exceed that
// of the raster source, since the raster source will access it during raster.
void SetImageDecodeController(ImageDecodeController* image_decode_controller);
// base::trace_event::MemoryDumpProvider implementation
bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
base::trace_event::ProcessMemoryDump* pmd) override;
protected:
friend class base::RefCountedThreadSafe<DisplayListRasterSource>;
DisplayListRasterSource(const DisplayListRecordingSource* other,
bool can_use_lcd_text);
DisplayListRasterSource(const DisplayListRasterSource* other,
bool can_use_lcd_text);
~DisplayListRasterSource() override;
// These members are const as this raster source may be in use on another
// thread and so should not be touched after construction.
const scoped_refptr<DisplayItemList> display_list_;
const size_t painter_reported_memory_usage_;
const SkColor background_color_;
const bool requires_clear_;
const bool can_use_lcd_text_;
const bool is_solid_color_;
const SkColor solid_color_;
const gfx::Rect recorded_viewport_;
const gfx::Size size_;
const bool clear_canvas_with_debug_color_;
const int slow_down_raster_scale_factor_for_debug_;
// TODO(enne/vmiura): this has a read/write race between raster and compositor
// threads with multi-threaded Ganesh. Make this const or remove it.
bool should_attempt_to_use_distance_field_text_;
// In practice, this is only set once before raster begins, so it's ok with
// respect to threading.
ImageDecodeController* image_decode_controller_;
private:
// Called when analyzing a tile. We can use AnalysisCanvas as
// SkPicture::AbortCallback, which allows us to early out from analysis.
void RasterForAnalysis(skia::AnalysisCanvas* canvas,
const gfx::Rect& canvas_rect,
float contents_scale) const;
void RasterCommon(SkCanvas* canvas,
SkPicture::AbortCallback* callback,
const gfx::Rect& canvas_bitmap_rect,
const gfx::Rect& canvas_playback_rect,
float contents_scale) const;
void PrepareForPlaybackToCanvas(SkCanvas* canvas,
const gfx::Rect& canvas_bitmap_rect,
const gfx::Rect& canvas_playback_rect,
float contents_scale) const;
// Used to ensure that memory dump logic always happens on the same thread.
base::ThreadChecker memory_dump_thread_checker_;
DISALLOW_COPY_AND_ASSIGN(DisplayListRasterSource);
};
} // namespace cc
#endif // CC_PLAYBACK_DISPLAY_LIST_RASTER_SOURCE_H_
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