submodule/skia/gm/skbug_9319.cpp

   1 /*
   2  * Copyright 2019 Google LLC
   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/gm.h"
   9 #include "include/core/SkCanvas.h"
  10 #include "include/core/SkMaskFilter.h"
  11 #include "include/core/SkPaint.h"
  12 #include "include/core/SkRRect.h"
  13 #include "include/core/SkRect.h"
  14
  15 // Illustrates a bug where the outer portion of the GPU rect blur was too dark with a small sigma.
  16 DEF_SIMPLE_GM(skbug_9319, canvas, 256, 512) {
  17     SkPaint p;
  18     p.setAntiAlias(true);
  19     p.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, 0.5f));
  20
  21     const auto r = SkRect::MakeXYWH(10, 10, 100, 100);
  22
  23     {
  24         SkAutoCanvasRestore acr(canvas, true);
  25         // Clip out interior so that the outer portion stands out.
  26         canvas->clipRect(r, SkClipOp::kDifference);
  27         canvas->drawRect(r, p);
  28     }
  29
  30     canvas->translate(0, 120);
  31
  32
  33     // RRect for comparison.
  34     const auto rr = SkRRect::MakeRectXY(r, .1f, .1f);
  35     {
  36         SkAutoCanvasRestore acr(canvas, true);
  37         canvas->clipRRect(rr, SkClipOp::kDifference);
  38         canvas->drawRRect(rr, p);
  39     }
  40 }