1/*
2 * Copyright 2013 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#include "gm.h"
9#include "SkColorFilter.h"
10#include "SkBlurMaskFilter.h"
11
12namespace skiagm {
13
14/**
15 * This test exercises bug 1719. An anti-aliased blurred path is rendered through a soft clip. On
16 * the GPU a scratch texture was used to hold the original path mask as well as the blurred path
17 * result. The same texture is then incorrectly used to generate the soft clip mask for the draw.
18 * Thus the same texture is used for both the blur mask and soft mask in a single draw.
19 *
20 * The correct image should look like a thin stroked round rect.
21 */
22class SkBug1719GM : public GM {
23public:
24    SkBug1719GM() {}
25
26protected:
27    virtual SkString onShortName() SK_OVERRIDE {
28        return SkString("skbug1719");
29    }
30
31    virtual SkISize onISize() SK_OVERRIDE {
32        return SkISize::Make(300, 100);
33    }
34
35    virtual void onDrawBackground(SkCanvas* canvas) SK_OVERRIDE {
36        SkPaint bgPaint;
37        bgPaint.setColor(0xFF303030);
38        canvas->drawPaint(bgPaint);
39    }
40
41    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
42        canvas->translate(SkIntToScalar(-800), SkIntToScalar(-650));
43
44        // The data is lifted from an SKP that exhibited the bug.
45
46        // This is a round rect.
47        SkPath clipPath;
48        clipPath.moveTo(832.f, 654.f);
49        clipPath.lineTo(1034.f, 654.f);
50        clipPath.cubicTo(1038.4183f, 654.f, 1042.f, 657.58173f, 1042.f, 662.f);
51        clipPath.lineTo(1042.f, 724.f);
52        clipPath.cubicTo(1042.f, 728.41827f, 1038.4183f, 732.f, 1034.f, 732.f);
53        clipPath.lineTo(832.f, 732.f);
54        clipPath.cubicTo(827.58173f, 732.f, 824.f, 728.41827f, 824.f, 724.f);
55        clipPath.lineTo(824.f, 662.f);
56        clipPath.cubicTo(824.f, 657.58173f, 827.58173f, 654.f, 832.f, 654.f);
57        clipPath.close();
58
59        // This is a round rect nested inside a rect.
60        SkPath drawPath;
61        drawPath.moveTo(823.f, 653.f);
62        drawPath.lineTo(1043.f, 653.f);
63        drawPath.lineTo(1043.f, 733.f);
64        drawPath.lineTo(823.f, 733.f);
65        drawPath.lineTo(823.f, 653.f);
66        drawPath.close();
67        drawPath.moveTo(832.f, 654.f);
68        drawPath.lineTo(1034.f, 654.f);
69        drawPath.cubicTo(1038.4183f, 654.f, 1042.f, 657.58173f, 1042.f, 662.f);
70        drawPath.lineTo(1042.f, 724.f);
71        drawPath.cubicTo(1042.f, 728.41827f, 1038.4183f, 732.f, 1034.f, 732.f);
72        drawPath.lineTo(832.f, 732.f);
73        drawPath.cubicTo(827.58173f, 732.f, 824.f, 728.41827f, 824.f, 724.f);
74        drawPath.lineTo(824.f, 662.f);
75        drawPath.cubicTo(824.f, 657.58173f, 827.58173f, 654.f, 832.f, 654.f);
76        drawPath.close();
77        drawPath.setFillType(SkPath::kEvenOdd_FillType);
78
79        SkPaint paint;
80        paint.setAntiAlias(true);
81        paint.setColor(0xFF000000);
82        paint.setMaskFilter(
83            SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
84                                     0.78867501f,
85                                     SkBlurMaskFilter::kHighQuality_BlurFlag))->unref();
86        paint.setColorFilter(
87            SkColorFilter::CreateModeFilter(0xBFFFFFFF, SkXfermode::kSrcIn_Mode))->unref();
88
89        canvas->clipPath(clipPath, SkRegion::kIntersect_Op, true);
90        canvas->drawPath(drawPath, paint);
91    }
92
93private:
94
95    typedef GM INHERITED;
96};
97
98//////////////////////////////////////////////////////////////////////////////
99
100DEF_GM(return new SkBug1719GM;)
101
102}
103