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 "SkBlurMaskFilter.h"
10#include "SkColorFilter.h"
11#include "SkPath.h"
12
13/**
14 * This test exercises bug 1719. An anti-aliased blurred path is rendered through a soft clip. On
15 * the GPU a scratch texture was used to hold the original path mask as well as the blurred path
16 * result. The same texture is then incorrectly used to generate the soft clip mask for the draw.
17 * Thus the same texture is used for both the blur mask and soft mask in a single draw.
18 *
19 * The correct image should look like a thin stroked round rect.
20 */
21DEF_SIMPLE_GM_BG(skbug1719, canvas, 300, 100,
22                 sk_tool_utils::color_to_565(0xFF303030)) {
23        canvas->translate(SkIntToScalar(-800), SkIntToScalar(-650));
24
25        // The data is lifted from an SKP that exhibited the bug.
26
27        // This is a round rect.
28        SkPath clipPath;
29        clipPath.moveTo(832.f, 654.f);
30        clipPath.lineTo(1034.f, 654.f);
31        clipPath.cubicTo(1038.4183f, 654.f, 1042.f, 657.58173f, 1042.f, 662.f);
32        clipPath.lineTo(1042.f, 724.f);
33        clipPath.cubicTo(1042.f, 728.41827f, 1038.4183f, 732.f, 1034.f, 732.f);
34        clipPath.lineTo(832.f, 732.f);
35        clipPath.cubicTo(827.58173f, 732.f, 824.f, 728.41827f, 824.f, 724.f);
36        clipPath.lineTo(824.f, 662.f);
37        clipPath.cubicTo(824.f, 657.58173f, 827.58173f, 654.f, 832.f, 654.f);
38        clipPath.close();
39
40        // This is a round rect nested inside a rect.
41        SkPath drawPath;
42        drawPath.moveTo(823.f, 653.f);
43        drawPath.lineTo(1043.f, 653.f);
44        drawPath.lineTo(1043.f, 733.f);
45        drawPath.lineTo(823.f, 733.f);
46        drawPath.lineTo(823.f, 653.f);
47        drawPath.close();
48        drawPath.moveTo(832.f, 654.f);
49        drawPath.lineTo(1034.f, 654.f);
50        drawPath.cubicTo(1038.4183f, 654.f, 1042.f, 657.58173f, 1042.f, 662.f);
51        drawPath.lineTo(1042.f, 724.f);
52        drawPath.cubicTo(1042.f, 728.41827f, 1038.4183f, 732.f, 1034.f, 732.f);
53        drawPath.lineTo(832.f, 732.f);
54        drawPath.cubicTo(827.58173f, 732.f, 824.f, 728.41827f, 824.f, 724.f);
55        drawPath.lineTo(824.f, 662.f);
56        drawPath.cubicTo(824.f, 657.58173f, 827.58173f, 654.f, 832.f, 654.f);
57        drawPath.close();
58        drawPath.setFillType(SkPath::kEvenOdd_FillType);
59
60        SkPaint paint;
61        paint.setAntiAlias(true);
62        paint.setColor(0xFF000000);
63        paint.setMaskFilter(
64            SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
65                                     0.78867501f,
66                                     SkBlurMaskFilter::kHighQuality_BlurFlag))->unref();
67        paint.setColorFilter(
68            SkColorFilter::CreateModeFilter(0xBFFFFFFF, SkXfermode::kSrcIn_Mode))->unref();
69
70        canvas->clipPath(clipPath, SkRegion::kIntersect_Op, true);
71        canvas->drawPath(drawPath, paint);
72}
73