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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_RESOURCES_RASTER_SOURCE_H_
#define CC_RESOURCES_RASTER_SOURCE_H_
#include <vector>
#include "base/memory/ref_counted.h"
#include "cc/base/cc_export.h"
#include "cc/debug/traced_value.h"
#include "skia/ext/refptr.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkPixelRef.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
class SkCanvas;
class SkPicture;
namespace cc {
class Picture;
class CC_EXPORT RasterSource : public base::RefCountedThreadSafe<RasterSource> {
public:
struct CC_EXPORT SolidColorAnalysis {
SolidColorAnalysis()
: is_solid_color(false), solid_color(SK_ColorTRANSPARENT) {}
~SolidColorAnalysis() {}
bool is_solid_color;
SkColor solid_color;
};
// 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 void PlaybackToCanvas(SkCanvas* canvas,
const gfx::Rect& canvas_rect,
float contents_scale) const = 0;
// 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.
virtual void PlaybackToSharedCanvas(SkCanvas* canvas,
const gfx::Rect& canvas_rect,
float contents_scale) const = 0;
// Analyze to determine if the given rect at given scale is of solid color in
// this raster source.
virtual void PerformSolidColorAnalysis(
const gfx::Rect& content_rect,
float contents_scale,
SolidColorAnalysis* analysis) const = 0;
// Returns true iff the whole raster source is of solid color.
virtual bool IsSolidColor() const = 0;
// Returns the color of the raster source if it is solid color. The results
// are unspecified if IsSolidColor returns false.
virtual SkColor GetSolidColor() const = 0;
// Returns the size of this raster source.
virtual gfx::Size GetSize() const = 0;
// Populate the given list with all SkPixelRefs that may overlap the given
// rect at given scale.
virtual void GatherPixelRefs(const gfx::Rect& content_rect,
float contents_scale,
std::vector<SkPixelRef*>* pixel_refs) const = 0;
// Return true iff this raster source can raster the given rect at given
// scale.
virtual bool CoversRect(const gfx::Rect& content_rect,
float contents_scale) const = 0;
// Returns true if this raster source has anything to rasterize.
virtual bool HasRecordings() const = 0;
// Informs the raster source that it should attempt to use distance field text
// during rasterization.
virtual void SetShouldAttemptToUseDistanceFieldText() = 0;
// Return true iff this raster source would benefit from using distance
// field text.
virtual bool ShouldAttemptToUseDistanceFieldText() const = 0;
// Tracing functionality.
virtual void DidBeginTracing() = 0;
virtual void AsValueInto(base::trace_event::TracedValue* array) const = 0;
virtual skia::RefPtr<SkPicture> GetFlattenedPicture() = 0;
virtual size_t GetPictureMemoryUsage() const = 0;
// Return true if LCD anti-aliasing may be used when rastering text.
virtual bool CanUseLCDText() const = 0;
virtual scoped_refptr<RasterSource> CreateCloneWithoutLCDText() const = 0;
protected:
friend class base::RefCountedThreadSafe<RasterSource>;
RasterSource() {}
virtual ~RasterSource() {}
private:
DISALLOW_COPY_AND_ASSIGN(RasterSource);
};
} // namespace cc
#endif // CC_RESOURCES_RASTER_SOURCE_H_
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