clipdrawdraw.cpp 2.0 KB

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  1. /*
  2. * Copyright 2014 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/SkCanvas.h"
  9. #include "include/core/SkColor.h"
  10. #include "include/core/SkPaint.h"
  11. #include "include/core/SkRect.h"
  12. #include "include/core/SkRegion.h"
  13. // This GM exercises the use case found in crbug.com/423834.
  14. // The following pattern:
  15. // save();
  16. // clipRect(rect, noAA);
  17. // drawRect(bigRect, noAA);
  18. // restore();
  19. //
  20. // drawRect(rect, noAA);
  21. // can leave 1 pixel wide remnants of the first rect.
  22. static void Draw(SkCanvas* canvas, const SkRect& rect) {
  23. SkPaint p;
  24. p.setAntiAlias(false);
  25. const SkRect bigRect = SkRect::MakeWH(600, 600);
  26. canvas->save();
  27. // draw a black rect through the clip
  28. canvas->save();
  29. canvas->clipRect(rect);
  30. canvas->drawRect(bigRect, p);
  31. canvas->restore();
  32. // now draw the white rect on top
  33. p.setColor(SK_ColorWHITE);
  34. canvas->drawRect(rect, p);
  35. canvas->restore();
  36. }
  37. DEF_SIMPLE_GM_BG(clipdrawdraw, canvas, 512, 512, 0xFFCCCCCC) {
  38. // Vertical remnant
  39. const SkRect rect1 = SkRect::MakeLTRB(136.5f, 137.5f, 338.5f, 293.5f);
  40. // Horizontal remnant
  41. // 179.488 rounds the right way (i.e., 179), 179.499 rounds the wrong way (i.e., 180)
  42. const SkRect rect2 = SkRect::MakeLTRB(207.5f, 179.499f, 530.5f, 429.5f);
  43. Draw(canvas, rect1);
  44. Draw(canvas, rect2);
  45. }
  46. ///////////////////////////////////////////////////////////////////////////////////////////////////
  47. DEF_SIMPLE_GM(clip_region, canvas, 256, 256) {
  48. SkRegion rgn({ 10, 10, 100, 100 });
  49. canvas->save();
  50. canvas->clipRegion(rgn);
  51. canvas->drawColor(SK_ColorRED);
  52. canvas->restore();
  53. SkRect bounds = { 30, 30, 80, 80 };
  54. canvas->saveLayer(&bounds, nullptr);
  55. canvas->clipRegion(rgn);
  56. canvas->drawColor(SK_ColorBLUE);
  57. canvas->restore();
  58. }