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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 uint32_t onGetFlags() const SK_OVERRIDE {
     28         return kSkipTiled_Flag;
     29     }
     30 
     31     virtual SkString onShortName() SK_OVERRIDE {
     32         return SkString("skbug1719");
     33     }
     34 
     35     virtual SkISize onISize() SK_OVERRIDE {
     36         return SkISize::Make(300, 100);
     37     }
     38 
     39     virtual void onDrawBackground(SkCanvas* canvas) SK_OVERRIDE {
     40         SkPaint bgPaint;
     41         bgPaint.setColor(0xFF303030);
     42         canvas->drawPaint(bgPaint);
     43     }
     44 
     45     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
     46         canvas->translate(SkIntToScalar(-800), SkIntToScalar(-650));
     47 
     48         // The data is lifted from an SKP that exhibited the bug.
     49 
     50         // This is a round rect.
     51         SkPath clipPath;
     52         clipPath.moveTo(832.f, 654.f);
     53         clipPath.lineTo(1034.f, 654.f);
     54         clipPath.cubicTo(1038.4183f, 654.f, 1042.f, 657.58173f, 1042.f, 662.f);
     55         clipPath.lineTo(1042.f, 724.f);
     56         clipPath.cubicTo(1042.f, 728.41827f, 1038.4183f, 732.f, 1034.f, 732.f);
     57         clipPath.lineTo(832.f, 732.f);
     58         clipPath.cubicTo(827.58173f, 732.f, 824.f, 728.41827f, 824.f, 724.f);
     59         clipPath.lineTo(824.f, 662.f);
     60         clipPath.cubicTo(824.f, 657.58173f, 827.58173f, 654.f, 832.f, 654.f);
     61         clipPath.close();
     62 
     63         // This is a round rect nested inside a rect.
     64         SkPath drawPath;
     65         drawPath.moveTo(823.f, 653.f);
     66         drawPath.lineTo(1043.f, 653.f);
     67         drawPath.lineTo(1043.f, 733.f);
     68         drawPath.lineTo(823.f, 733.f);
     69         drawPath.lineTo(823.f, 653.f);
     70         drawPath.close();
     71         drawPath.moveTo(832.f, 654.f);
     72         drawPath.lineTo(1034.f, 654.f);
     73         drawPath.cubicTo(1038.4183f, 654.f, 1042.f, 657.58173f, 1042.f, 662.f);
     74         drawPath.lineTo(1042.f, 724.f);
     75         drawPath.cubicTo(1042.f, 728.41827f, 1038.4183f, 732.f, 1034.f, 732.f);
     76         drawPath.lineTo(832.f, 732.f);
     77         drawPath.cubicTo(827.58173f, 732.f, 824.f, 728.41827f, 824.f, 724.f);
     78         drawPath.lineTo(824.f, 662.f);
     79         drawPath.cubicTo(824.f, 657.58173f, 827.58173f, 654.f, 832.f, 654.f);
     80         drawPath.close();
     81         drawPath.setFillType(SkPath::kEvenOdd_FillType);
     82 
     83         SkPaint paint;
     84         paint.setAntiAlias(true);
     85         paint.setColor(0xFF000000);
     86         paint.setMaskFilter(
     87             SkBlurMaskFilter::Create(kNormal_SkBlurStyle,
     88                                      0.78867501f,
     89                                      SkBlurMaskFilter::kHighQuality_BlurFlag))->unref();
     90         paint.setColorFilter(
     91             SkColorFilter::CreateModeFilter(0xBFFFFFFF, SkXfermode::kSrcIn_Mode))->unref();
     92 
     93         canvas->clipPath(clipPath, SkRegion::kIntersect_Op, true);
     94         canvas->drawPath(drawPath, paint);
     95     }
     96 
     97 private:
     98 
     99     typedef GM INHERITED;
    100 };
    101 
    102 //////////////////////////////////////////////////////////////////////////////
    103 
    104 DEF_GM(return new SkBug1719GM;)
    105 
    106 }
    107