1 /* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkOverdrawCanvas_DEFINED 9 #define SkOverdrawCanvas_DEFINED 10 11 #include "include/core/SkCanvasVirtualEnforcer.h" 12 #include "include/utils/SkNWayCanvas.h" 13 14 /** 15 * Captures all drawing commands. Rather than draw the actual content, this device 16 * increments the alpha channel of each pixel every time it would have been touched 17 * by a draw call. This is useful for detecting overdraw. 18 */ 19 class SK_API SkOverdrawCanvas : public SkCanvasVirtualEnforcer<SkNWayCanvas> { 20 public: 21 /* Does not take ownership of canvas */ 22 SkOverdrawCanvas(SkCanvas*); 23 24 void onDrawTextBlob(const SkTextBlob*, SkScalar, SkScalar, const SkPaint&) override; 25 void onDrawPatch(const SkPoint[12], const SkColor[4], const SkPoint[4], SkBlendMode, 26 const SkPaint&) override; 27 void onDrawPaint(const SkPaint&) override; 28 void onDrawBehind(const SkPaint& paint) override; 29 void onDrawRect(const SkRect&, const SkPaint&) override; 30 void onDrawRegion(const SkRegion&, const SkPaint&) override; 31 void onDrawOval(const SkRect&, const SkPaint&) override; 32 void onDrawArc(const SkRect&, SkScalar, SkScalar, bool, const SkPaint&) override; 33 void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override; 34 void onDrawRRect(const SkRRect&, const SkPaint&) override; 35 void onDrawPoints(PointMode, size_t, const SkPoint[], const SkPaint&) override; 36 void onDrawVerticesObject(const SkVertices*, const SkVertices::Bone bones[], int boneCount, 37 SkBlendMode, const SkPaint&) override; 38 void onDrawAtlas(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[], 39 int, SkBlendMode, const SkRect*, const SkPaint*) override; 40 void onDrawPath(const SkPath&, const SkPaint&) override; 41 void onDrawImage(const SkImage*, SkScalar, SkScalar, const SkPaint*) override; 42 void onDrawImageRect(const SkImage*, const SkRect*, const SkRect&, const SkPaint*, 43 SrcRectConstraint) override; 44 void onDrawImageNine(const SkImage*, const SkIRect&, const SkRect&, const SkPaint*) override; 45 void onDrawImageLattice(const SkImage*, const Lattice&, const SkRect&, const SkPaint*) override; 46 void onDrawBitmap(const SkBitmap&, SkScalar, SkScalar, const SkPaint*) override; 47 void onDrawBitmapRect(const SkBitmap&, const SkRect*, const SkRect&, const SkPaint*, 48 SrcRectConstraint) override; 49 void onDrawBitmapNine(const SkBitmap&, const SkIRect&, const SkRect&, const SkPaint*) override; 50 void onDrawBitmapLattice(const SkBitmap&, const Lattice&, const SkRect&, 51 const SkPaint*) override; 52 void onDrawDrawable(SkDrawable*, const SkMatrix*) override; 53 void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) override; 54 55 void onDrawAnnotation(const SkRect&, const char key[], SkData* value) override; 56 void onDrawShadowRec(const SkPath&, const SkDrawShadowRec&) override; 57 58 void onDrawEdgeAAQuad(const SkRect&, const SkPoint[4], SkCanvas::QuadAAFlags, SkColor, 59 SkBlendMode) override; 60 void onDrawEdgeAAImageSet(const ImageSetEntry[], int count, const SkPoint[], const SkMatrix[], 61 const SkPaint*, SrcRectConstraint) override; 62 63 private: 64 void drawPosTextCommon(const SkGlyphID[], int, const SkScalar[], int, const SkPoint&, 65 const SkFont&, const SkPaint&); 66 67 inline SkPaint overdrawPaint(const SkPaint& paint); 68 69 SkPaint fPaint; 70 71 typedef SkCanvasVirtualEnforcer<SkNWayCanvas> INHERITED; 72 }; 73 74 #endif 75