crbug_892988.cpp 1.3 KB

123456789101112131415161718192021222324252627282930313233
  1. /*
  2. * Copyright 2018 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. #include "gm/gm.h"
  8. #include "include/core/SkBlendMode.h"
  9. #include "include/core/SkCanvas.h"
  10. #include "include/core/SkPaint.h"
  11. #include "include/core/SkRect.h"
  12. // The root cause of this bug was that when dual source blending was not supported and we made a
  13. // copy of the destination to perform blending we would clip the copy bounds to the current clip.
  14. // However, it is possible for anti-aliased that are fully contained by the clip in a geometric
  15. // sense to actually draw outside the clip in pixel space because we don't consider aa bloat when
  16. // determining if the draw is contained by the clip.
  17. DEF_SIMPLE_GM(crbug_892988, canvas, 256, 256) {
  18. SkPaint paint1;
  19. paint1.setStyle(SkPaint::kStroke_Style);
  20. paint1.setStrokeWidth(1.f);
  21. paint1.setAntiAlias(true);
  22. canvas->drawRect(SkRect::MakeLTRB(11.5, 0.5, 245.5, 245.5), paint1);
  23. canvas->clipRect(SkRect::MakeLTRB(12, 1, 244, 244), true);
  24. SkPaint paint2;
  25. // Use src mode with a non-opaque color to produce a blend that can't be handled with
  26. // simple blend coefficients.
  27. paint2.setColor(0xF0FFFFFF);
  28. paint2.setBlendMode(SkBlendMode::kSrc);
  29. paint2.setAntiAlias(true);
  30. canvas->drawRect(SkRect::MakeLTRB(12, 1, 244, 244), paint2);
  31. }