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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 "SkColorFilter.h"
     10 #include "SkBlurMaskFilter.h"
     11 
     12 namespace 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  */
     22 class SkBug1719GM : public GM {
     23 public:
     24     SkBug1719GM() {}
     25 
     26 protected:
     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 
     93 private:
     94 
     95     typedef GM INHERITED;
     96 };
     97 
     98 //////////////////////////////////////////////////////////////////////////////
     99 
    100 DEF_GM(return new SkBug1719GM;)
    101 
    102 }
    103