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// Copyright 2012 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_PICTURE_H_
#define CC_RESOURCES_PICTURE_H_
#include <string>
#include <utility>
#include <vector>
#include "base/basictypes.h"
#include "base/containers/hash_tables.h"
#include "base/debug/trace_event.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/thread_checker.h"
#include "cc/base/cc_export.h"
#include "cc/base/region.h"
#include "skia/ext/refptr.h"
#include "third_party/skia/include/core/SkBBHFactory.h"
#include "third_party/skia/include/core/SkPicture.h"
#include "third_party/skia/include/record/SkRecording.h"
#include "ui/gfx/rect.h"
class SkPixelRef;
namespace base {
class Value;
}
namespace skia {
class AnalysisCanvas;
}
namespace cc {
class ContentLayerClient;
class CC_EXPORT Picture
: public base::RefCountedThreadSafe<Picture> {
public:
typedef std::pair<int, int> PixelRefMapKey;
typedef std::vector<SkPixelRef*> PixelRefs;
typedef base::hash_map<PixelRefMapKey, PixelRefs> PixelRefMap;
enum RecordingMode {
RECORD_NORMALLY,
RECORD_WITH_SK_NULL_CANVAS,
RECORD_WITH_PAINTING_DISABLED,
RECORD_WITH_SKRECORD,
RECORDING_MODE_COUNT, // Must be the last entry.
};
static scoped_refptr<Picture> Create(
const gfx::Rect& layer_rect,
ContentLayerClient* client,
const SkTileGridFactory::TileGridInfo& tile_grid_info,
bool gather_pixels_refs,
int num_raster_threads,
RecordingMode recording_mode);
static scoped_refptr<Picture> CreateFromValue(const base::Value* value);
static scoped_refptr<Picture> CreateFromSkpValue(const base::Value* value);
gfx::Rect LayerRect() const { return layer_rect_; }
gfx::Rect OpaqueRect() const { return opaque_rect_; }
// Get thread-safe clone for rasterizing with on a specific thread.
Picture* GetCloneForDrawingOnThread(unsigned thread_index);
// Has Record() been called yet?
bool HasRecording() const { return picture_.get() != NULL; }
bool IsSuitableForGpuRasterization() const;
// Apply this scale and raster the negated region into the canvas. See comment
// in PicturePileImpl::RasterCommon for explanation on negated content region.
int Raster(SkCanvas* canvas,
SkDrawPictureCallback* callback,
const Region& negated_content_region,
float contents_scale);
// Draw the picture directly into the given canvas, without applying any
// clip/scale/layer transformations.
void Replay(SkCanvas* canvas);
scoped_ptr<base::Value> AsValue() const;
// This iterator imprecisely returns the set of pixel refs that are needed to
// raster this layer rect from this picture. Internally, pixel refs are
// clumped into tile grid buckets, so there may be false positives.
class CC_EXPORT PixelRefIterator {
public:
PixelRefIterator();
PixelRefIterator(const gfx::Rect& layer_rect, const Picture* picture);
~PixelRefIterator();
SkPixelRef* operator->() const {
DCHECK_LT(current_index_, current_pixel_refs_->size());
return (*current_pixel_refs_)[current_index_];
}
SkPixelRef* operator*() const {
DCHECK_LT(current_index_, current_pixel_refs_->size());
return (*current_pixel_refs_)[current_index_];
}
PixelRefIterator& operator++();
operator bool() const {
return current_index_ < current_pixel_refs_->size();
}
private:
static base::LazyInstance<PixelRefs> empty_pixel_refs_;
const Picture* picture_;
const PixelRefs* current_pixel_refs_;
unsigned current_index_;
gfx::Point min_point_;
gfx::Point max_point_;
int current_x_;
int current_y_;
};
void EmitTraceSnapshot() const;
void EmitTraceSnapshotAlias(Picture* original) const;
bool WillPlayBackBitmaps() const { return picture_->willPlayBackBitmaps(); }
private:
explicit Picture(const gfx::Rect& layer_rect);
// This constructor assumes SkPicture is already ref'd and transfers
// ownership to this picture.
Picture(const skia::RefPtr<SkPicture>&,
const gfx::Rect& layer_rect,
const gfx::Rect& opaque_rect,
const PixelRefMap& pixel_refs);
// This constructor will call AdoptRef on the SkPicture.
Picture(SkPicture*,
const gfx::Rect& layer_rect,
const gfx::Rect& opaque_rect);
~Picture();
// Make thread-safe clones for rasterizing with.
void CloneForDrawing(int num_threads);
// Record a paint operation. To be able to safely use this SkPicture for
// playback on a different thread this can only be called once.
void Record(ContentLayerClient* client,
const SkTileGridFactory::TileGridInfo& tile_grid_info,
RecordingMode recording_mode);
// Gather pixel refs from recording.
void GatherPixelRefs(const SkTileGridFactory::TileGridInfo& tile_grid_info);
gfx::Rect layer_rect_;
gfx::Rect opaque_rect_;
skia::RefPtr<SkPicture> picture_;
scoped_ptr<const EXPERIMENTAL::SkPlayback> playback_;
typedef std::vector<scoped_refptr<Picture> > PictureVector;
PictureVector clones_;
PixelRefMap pixel_refs_;
gfx::Point min_pixel_cell_;
gfx::Point max_pixel_cell_;
gfx::Size cell_size_;
scoped_refptr<base::debug::ConvertableToTraceFormat>
AsTraceableRasterData(float scale) const;
scoped_refptr<base::debug::ConvertableToTraceFormat>
AsTraceableRecordData() const;
base::ThreadChecker raster_thread_checker_;
friend class base::RefCountedThreadSafe<Picture>;
friend class PixelRefIterator;
DISALLOW_COPY_AND_ASSIGN(Picture);
};
} // namespace cc
#endif // CC_RESOURCES_PICTURE_H_
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