submodule/skia/gm/crbug_1174186.cpp

   1 /*
   2  * Copyright 2021 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/SkMatrix.h"
  11 #include "include/core/SkRect.h"
  12
  13 // Outsetting of very thin, nearly line, quads for AA would go haywire and draw far outside of the
  14 // quad. Artifacts seemed to occur more when coord values are large, hence the large GM size. At the
  15 // time of GM creation this was fixed by dropping AA, which makes these quads practically never draw
  16 // as it's very unlikely a pixel center would fall inside the geometry.
  17 DEF_SIMPLE_GM(crbug_1174186, canvas, 1200, 1200) {
  18     auto m = SkMatrix::MakeAll(
  19             SkBits2Float(0x24480629), SkBits2Float(0xbf3555c2), SkBits2Float(0x4377d67b),
  20             SkBits2Float(0x23a61d51), SkBits2Float(0x3f34b400), SkBits2Float(0x4453f572),
  21             SkBits2Float(0x00000000), SkBits2Float(0x00000000), SkBits2Float(0x3f800000));
  22
  23     SkPoint pts[] = {{SkBits2Float(0x3f7ffff2), SkBits2Float(0x43483d60)},
  24                      {SkBits2Float(0x00000000), SkBits2Float(0x43483d60)},
  25                      {SkBits2Float(0x00000000), SkBits2Float(0x4311a628)},
  26                      {SkBits2Float(0x3f800000), SkBits2Float(0x43130f8c)}};
  27     SkColor color = SK_ColorGREEN;
  28     canvas->translate(-500, 0);
  29     for (int i = 0; i < 10; ++i) {
  30         for (int flags = 0; flags < static_cast<int>(SkCanvas::kAll_QuadAAFlags); ++flags) {
  31             SkCanvas::QuadAAFlags aaFlags = static_cast<SkCanvas::QuadAAFlags>(flags);
  32             canvas->save();
  33             canvas->concat(m);
  34             canvas->experimental_DrawEdgeAAQuad(SkRect::MakeWH(1000, 1000), pts, aaFlags, color,
  35                                                 SkBlendMode::kSrcOver);
  36             canvas->restore();
  37             canvas->translate(5.1f, 0);
  38             SkColor rgb = color & 0x00FFFFFF;
  39             color = 0xFF000000 | (rgb << 4) | (rgb >> 20);
  40         }
  41     }
  42 }