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      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 "sk_tool_utils.h"
     10 #include "SkBlurMaskFilter.h"
     11 #include "SkColorFilter.h"
     12 #include "SkPath.h"
     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  */
     22 DEF_SIMPLE_GM_BG(skbug1719, canvas, 300, 100,
     23                  sk_tool_utils::color_to_565(0xFF303030)) {
     24         canvas->translate(SkIntToScalar(-800), SkIntToScalar(-650));
     25 
     26         // The data is lifted from an SKP that exhibited the bug.
     27 
     28         // This is a round rect.
     29         SkPath clipPath;
     30         clipPath.moveTo(832.f, 654.f);
     31         clipPath.lineTo(1034.f, 654.f);
     32         clipPath.cubicTo(1038.4183f, 654.f, 1042.f, 657.58173f, 1042.f, 662.f);
     33         clipPath.lineTo(1042.f, 724.f);
     34         clipPath.cubicTo(1042.f, 728.41827f, 1038.4183f, 732.f, 1034.f, 732.f);
     35         clipPath.lineTo(832.f, 732.f);
     36         clipPath.cubicTo(827.58173f, 732.f, 824.f, 728.41827f, 824.f, 724.f);
     37         clipPath.lineTo(824.f, 662.f);
     38         clipPath.cubicTo(824.f, 657.58173f, 827.58173f, 654.f, 832.f, 654.f);
     39         clipPath.close();
     40 
     41         // This is a round rect nested inside a rect.
     42         SkPath drawPath;
     43         drawPath.moveTo(823.f, 653.f);
     44         drawPath.lineTo(1043.f, 653.f);
     45         drawPath.lineTo(1043.f, 733.f);
     46         drawPath.lineTo(823.f, 733.f);
     47         drawPath.lineTo(823.f, 653.f);
     48         drawPath.close();
     49         drawPath.moveTo(832.f, 654.f);
     50         drawPath.lineTo(1034.f, 654.f);
     51         drawPath.cubicTo(1038.4183f, 654.f, 1042.f, 657.58173f, 1042.f, 662.f);
     52         drawPath.lineTo(1042.f, 724.f);
     53         drawPath.cubicTo(1042.f, 728.41827f, 1038.4183f, 732.f, 1034.f, 732.f);
     54         drawPath.lineTo(832.f, 732.f);
     55         drawPath.cubicTo(827.58173f, 732.f, 824.f, 728.41827f, 824.f, 724.f);
     56         drawPath.lineTo(824.f, 662.f);
     57         drawPath.cubicTo(824.f, 657.58173f, 827.58173f, 654.f, 832.f, 654.f);
     58         drawPath.close();
     59         drawPath.setFillType(SkPath::kEvenOdd_FillType);
     60 
     61         SkPaint paint;
     62         paint.setAntiAlias(true);
     63         paint.setColor(0xFF000000);
     64         paint.setMaskFilter(
     65             SkBlurMaskFilter::Make(kNormal_SkBlurStyle, 0.78867501f,
     66                                    SkBlurMaskFilter::kHighQuality_BlurFlag));
     67         paint.setColorFilter(SkColorFilter::MakeModeFilter(0xBFFFFFFF, SkBlendMode::kSrcIn));
     68 
     69         canvas->clipPath(clipPath, true);
     70         canvas->drawPath(drawPath, paint);
     71 }
     72