blurquickreject.cpp 3.1 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091
  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. #include "gm/gm.h"
  8. #include "include/core/SkBlurTypes.h"
  9. #include "include/core/SkCanvas.h"
  10. #include "include/core/SkColor.h"
  11. #include "include/core/SkFilterQuality.h"
  12. #include "include/core/SkMaskFilter.h"
  13. #include "include/core/SkPaint.h"
  14. #include "include/core/SkRect.h"
  15. #include "include/core/SkScalar.h"
  16. #include "include/core/SkSize.h"
  17. #include "include/core/SkString.h"
  18. #include "include/core/SkTypes.h"
  19. #include "src/core/SkBlurMask.h"
  20. // This GM tests out the quick reject bounds of the blur mask filter. It draws
  21. // four blurred rects around a central clip. The blurred rect geometry outset
  22. // by the blur radius does not overlap the clip rect so, if the blur clipping
  23. // just uses the radius, they will be clipped out (and the result will differ
  24. // from the result if quick reject were disabled. If the blur clipping uses
  25. // the correct 3 sigma bound then the images with and without quick rejecting
  26. // will be the same.
  27. class BlurQuickRejectGM : public skiagm::GM {
  28. public:
  29. BlurQuickRejectGM() {}
  30. protected:
  31. SkString onShortName() override {
  32. return SkString("blurquickreject");
  33. }
  34. SkISize onISize() override {
  35. return SkISize::Make(kWidth, kHeight);
  36. }
  37. void onDraw(SkCanvas* canvas) override {
  38. constexpr SkScalar kBlurRadius = SkIntToScalar(20);
  39. constexpr SkScalar kBoxSize = SkIntToScalar(100);
  40. SkRect clipRect = SkRect::MakeXYWH(0, 0, kBoxSize, kBoxSize);
  41. SkRect blurRects[] = {
  42. { -kBoxSize - (kBlurRadius+1), 0, -(kBlurRadius+1), kBoxSize },
  43. { 0, -kBoxSize - (kBlurRadius+1), kBoxSize, -(kBlurRadius+1) },
  44. { kBoxSize+kBlurRadius+1, 0, 2*kBoxSize+kBlurRadius+1, kBoxSize },
  45. { 0, kBoxSize+kBlurRadius+1, kBoxSize, 2*kBoxSize+kBlurRadius+1 }
  46. };
  47. SkColor colors[] = {
  48. SK_ColorRED,
  49. SK_ColorGREEN,
  50. SK_ColorBLUE,
  51. SK_ColorYELLOW,
  52. };
  53. SkASSERT(SK_ARRAY_COUNT(colors) == SK_ARRAY_COUNT(blurRects));
  54. SkPaint hairlinePaint;
  55. hairlinePaint.setStyle(SkPaint::kStroke_Style);
  56. hairlinePaint.setColor(SK_ColorWHITE);
  57. hairlinePaint.setStrokeWidth(0);
  58. SkPaint blurPaint;
  59. blurPaint.setFilterQuality(kLow_SkFilterQuality);
  60. blurPaint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle,
  61. SkBlurMask::ConvertRadiusToSigma(kBlurRadius)));
  62. canvas->clear(SK_ColorBLACK);
  63. canvas->save();
  64. canvas->translate(kBoxSize, kBoxSize);
  65. canvas->drawRect(clipRect, hairlinePaint);
  66. canvas->clipRect(clipRect);
  67. for (size_t i = 0; i < SK_ARRAY_COUNT(blurRects); ++i) {
  68. blurPaint.setColor(colors[i]);
  69. canvas->drawRect(blurRects[i], blurPaint);
  70. canvas->drawRect(blurRects[i], hairlinePaint);
  71. }
  72. canvas->restore();
  73. }
  74. private:
  75. static constexpr int kWidth = 300;
  76. static constexpr int kHeight = 300;
  77. typedef GM INHERITED;
  78. };
  79. DEF_GM( return new BlurQuickRejectGM(); )