| /* |
| * 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 RegionTracker_h |
| #define RegionTracker_h |
| |
| #include "platform/PlatformExport.h" |
| #include "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 // RegionTracker_h |