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 "SkNWayCanvas.h"
12
13/**
14 *  Captures all drawing commands.  Rather than draw the actual content, this device
15 *  increments the alpha channel of each pixel every time it would have been touched
16 *  by a draw call.  This is useful for detecting overdraw.
17 */
18class SkOverdrawCanvas : public SkNWayCanvas {
19public:
20    /* Does not take ownership of canvas */
21    SkOverdrawCanvas(SkCanvas*);
22
23    void onDrawText(const void*, size_t, SkScalar, SkScalar, const SkPaint&) override;
24    void onDrawPosText(const void*, size_t, const SkPoint[], const SkPaint&) override;
25    void onDrawPosTextH(const void*, size_t, const SkScalar[], SkScalar, const SkPaint&) override;
26    void onDrawTextOnPath(const void*, size_t, const SkPath&, const SkMatrix*,
27                          const SkPaint&) override;
28    void onDrawTextRSXform(const void*, size_t, const SkRSXform[], const SkRect*,
29                           const SkPaint&) override;
30    void onDrawTextBlob(const SkTextBlob*, SkScalar, SkScalar, const SkPaint&) override;
31    void onDrawPatch(const SkPoint[12], const SkColor[4], const SkPoint[4], SkBlendMode,
32                     const SkPaint&) override;
33    void onDrawPaint(const SkPaint&) override;
34    void onDrawRect(const SkRect&, const SkPaint&) override;
35    void onDrawRegion(const SkRegion&, const SkPaint&) override;
36    void onDrawOval(const SkRect&, const SkPaint&) override;
37    void onDrawArc(const SkRect&, SkScalar, SkScalar, bool, const SkPaint&) override;
38    void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) override;
39    void onDrawRRect(const SkRRect&, const SkPaint&) override;
40    void onDrawPoints(PointMode, size_t, const SkPoint[], const SkPaint&) override;
41    void onDrawVerticesObject(const SkVertices*, SkBlendMode, const SkPaint&) override;
42    void onDrawAtlas(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[],
43                     int, SkBlendMode, const SkRect*, const SkPaint*) override;
44    void onDrawPath(const SkPath&, const SkPaint&) override;
45    void onDrawImage(const SkImage*, SkScalar, SkScalar, const SkPaint*) override;
46    void onDrawImageRect(const SkImage*, const SkRect*, const SkRect&, const SkPaint*,
47                         SrcRectConstraint) override;
48    void onDrawImageNine(const SkImage*, const SkIRect&, const SkRect&, const SkPaint*) override;
49    void onDrawImageLattice(const SkImage*, const Lattice&, const SkRect&, const SkPaint*) override;
50    void onDrawBitmap(const SkBitmap&, SkScalar, SkScalar, const SkPaint*) override;
51    void onDrawBitmapRect(const SkBitmap&, const SkRect*, const SkRect&, const SkPaint*,
52                          SrcRectConstraint) override;
53    void onDrawBitmapNine(const SkBitmap&, const SkIRect&, const SkRect&, const SkPaint*) override;
54    void onDrawBitmapLattice(const SkBitmap&, const Lattice&, const SkRect&,
55                             const SkPaint*) override;
56    void onDrawDrawable(SkDrawable*, const SkMatrix*) override;
57    void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*) override;
58
59private:
60    void drawPosTextCommon(const void*, size_t, const SkScalar[], int, const SkPoint&,
61                           const SkPaint&);
62
63    inline SkPaint overdrawPaint(const SkPaint& paint);
64
65    SkPaint   fPaint;
66
67    typedef SkNWayCanvas INHERITED;
68};
69
70#endif
71