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 */
19class SK_API SkOverdrawCanvas : public SkCanvasVirtualEnforcer<SkNWayCanvas> {
20public:
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*, SkBlendMode, const SkPaint&) override;
37 void onDrawAtlas(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[],
38 int, SkBlendMode, const SkRect*, const SkPaint*) override;
39 void onDrawPath(const SkPath&, const SkPaint&) override;
40 void onDrawImage(const SkImage*, SkScalar, SkScalar, const SkPaint*) override;
41 void onDrawImageRect(const SkImage*, const SkRect*, const SkRect&, const SkPaint*,
42 SrcRectConstraint) override;
43 void onDrawImageNine(const SkImage*, const SkIRect&, const SkRect&, const SkPaint*) override;
44 void onDrawImageLattice(const SkImage*, const Lattice&, const SkRect&, const SkPaint*) override;
45 void onDrawDrawable(SkDrawable*, const SkMatrix*) override;
46 void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) override;
47
48 void onDrawAnnotation(const SkRect&, const char key[], SkData* value) override;
49 void onDrawShadowRec(const SkPath&, const SkDrawShadowRec&) override;
50
51 void onDrawEdgeAAQuad(const SkRect&, const SkPoint[4], SkCanvas::QuadAAFlags, const SkColor4f&,
52 SkBlendMode) override;
53 void onDrawEdgeAAImageSet(const ImageSetEntry[], int count, const SkPoint[], const SkMatrix[],
54 const SkPaint*, SrcRectConstraint) override;
55
56private:
57 void drawPosTextCommon(const SkGlyphID[], int, const SkScalar[], int, const SkPoint&,
58 const SkFont&, const SkPaint&);
59
60 inline SkPaint overdrawPaint(const SkPaint& paint);
61
62 SkPaint fPaint;
63
64 typedef SkCanvasVirtualEnforcer<SkNWayCanvas> INHERITED;
65};
66
67#endif
68