mirror of
https://github.com/flutter/flutter.git
synced 2026-02-20 02:29:02 +08:00
119 lines
4.3 KiB
C++
119 lines
4.3 KiB
C++
/*
|
|
* Copyright (c) 2012, Google Inc. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following disclaimer
|
|
* in the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* * Neither the name of Google Inc. nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef SKY_ENGINE_PLATFORM_GRAPHICS_REGIONTRACKER_H_
|
|
#define SKY_ENGINE_PLATFORM_GRAPHICS_REGIONTRACKER_H_
|
|
|
|
#include "sky/engine/platform/PlatformExport.h"
|
|
#include "sky/engine/platform/geometry/IntRect.h"
|
|
#include "third_party/skia/include/core/SkBitmap.h"
|
|
#include "third_party/skia/include/core/SkCanvas.h"
|
|
#include "third_party/skia/include/core/SkPaint.h"
|
|
#include "third_party/skia/include/core/SkPoint.h"
|
|
#include "third_party/skia/include/core/SkRect.h"
|
|
|
|
namespace blink {
|
|
class GraphicsContext;
|
|
|
|
enum RegionTrackingMode {
|
|
TrackOpaqueRegion,
|
|
TRackOverwriteRegion
|
|
};
|
|
|
|
// This class is an encapsulation of functionality for GraphicsContext, and its methods are mirrored
|
|
// there for the outside world. It tracks paints and computes what area will be opaque.
|
|
class PLATFORM_EXPORT RegionTracker final {
|
|
public:
|
|
RegionTracker();
|
|
|
|
// The resulting opaque region as a single rect.
|
|
IntRect asRect() const;
|
|
|
|
void pushCanvasLayer(const SkPaint*);
|
|
void popCanvasLayer(const GraphicsContext*);
|
|
|
|
void setImageMask(const SkRect& imageOpaqueRect);
|
|
|
|
enum RegionType {
|
|
Opaque,
|
|
Overwrite
|
|
};
|
|
|
|
// Set this to true to track regions that occlude the destination instead of only regions that produce opaque pixels.
|
|
void setTrackedRegionType(RegionType type) { m_trackedRegionType = type; }
|
|
|
|
enum DrawType {
|
|
FillOnly,
|
|
FillOrStroke
|
|
};
|
|
|
|
void didDrawRect(const GraphicsContext*, const SkRect&, const SkPaint&, const SkBitmap* sourceBitmap);
|
|
void didDrawPath(const GraphicsContext*, const SkPath&, const SkPaint&);
|
|
void didDrawPoints(const GraphicsContext*, SkCanvas::PointMode, int numPoints, const SkPoint[], const SkPaint&);
|
|
void didDrawBounded(const GraphicsContext*, const SkRect&, const SkPaint&);
|
|
void didDrawUnbounded(const GraphicsContext*, const SkPaint&, DrawType);
|
|
|
|
struct CanvasLayerState {
|
|
CanvasLayerState()
|
|
: hasImageMask(false)
|
|
, opaqueRect(SkRect::MakeEmpty())
|
|
{ }
|
|
|
|
SkPaint paint;
|
|
|
|
// An image mask is being applied to the layer.
|
|
bool hasImageMask;
|
|
// The opaque area in the image mask.
|
|
SkRect imageOpaqueRect;
|
|
|
|
SkRect opaqueRect;
|
|
};
|
|
|
|
void reset();
|
|
|
|
private:
|
|
void didDraw(const GraphicsContext*, const SkRect&, const SkPaint&, const SkBitmap* sourceBitmap, bool fillsBounds, DrawType);
|
|
void applyOpaqueRegionFromLayer(const GraphicsContext*, const SkRect& layerOpaqueRect, const SkPaint&);
|
|
void markRectAsOpaque(const SkRect&);
|
|
void markRectAsNonOpaque(const SkRect&);
|
|
void markAllAsNonOpaque();
|
|
|
|
SkRect& currentTrackingOpaqueRect();
|
|
|
|
SkRect m_opaqueRect;
|
|
RegionType m_trackedRegionType;
|
|
|
|
Vector<CanvasLayerState, 3> m_canvasLayerStack;
|
|
};
|
|
|
|
} // namespace blink
|
|
|
|
#endif // SKY_ENGINE_PLATFORM_GRAPHICS_REGIONTRACKER_H_
|