SampleAARectModes.cpp 3.1 KB

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  1. /*
  2. * Copyright 2011 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 "include/core/SkBitmap.h"
  8. #include "include/core/SkCanvas.h"
  9. #include "include/core/SkColorPriv.h"
  10. #include "include/core/SkShader.h"
  11. #include "samplecode/Sample.h"
  12. static const SkBlendMode gModes[] = {
  13. SkBlendMode::kClear,
  14. SkBlendMode::kSrc,
  15. SkBlendMode::kDst,
  16. SkBlendMode::kSrcOver,
  17. SkBlendMode::kDstOver,
  18. SkBlendMode::kSrcIn,
  19. SkBlendMode::kDstIn,
  20. SkBlendMode::kSrcOut,
  21. SkBlendMode::kDstOut,
  22. SkBlendMode::kSrcATop,
  23. SkBlendMode::kDstATop,
  24. SkBlendMode::kXor,
  25. };
  26. const int gWidth = 64;
  27. const int gHeight = 64;
  28. const SkScalar W = SkIntToScalar(gWidth);
  29. const SkScalar H = SkIntToScalar(gHeight);
  30. static SkScalar drawCell(SkCanvas* canvas, SkBlendMode mode, SkAlpha a0, SkAlpha a1) {
  31. SkPaint paint;
  32. paint.setAntiAlias(true);
  33. SkRect r = SkRect::MakeWH(W, H);
  34. r.inset(W/10, H/10);
  35. paint.setColor(SK_ColorBLUE);
  36. paint.setAlpha(a0);
  37. canvas->drawOval(r, paint);
  38. paint.setColor(SK_ColorRED);
  39. paint.setAlpha(a1);
  40. paint.setBlendMode(mode);
  41. SkScalar offset = SK_Scalar1 / 3;
  42. SkRect rect = SkRect::MakeXYWH(W / 4 + offset,
  43. H / 4 + offset,
  44. W / 2, H / 2);
  45. canvas->drawRect(rect, paint);
  46. return H;
  47. }
  48. static sk_sp<SkShader> make_bg_shader() {
  49. SkBitmap bm;
  50. bm.allocN32Pixels(2, 2);
  51. *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
  52. *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCC,
  53. 0xCC, 0xCC);
  54. SkMatrix m;
  55. m.setScale(SkIntToScalar(6), SkIntToScalar(6));
  56. return bm.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, &m);
  57. }
  58. class AARectsModesView : public Sample {
  59. SkPaint fBGPaint;
  60. void onOnceBeforeDraw() override {
  61. fBGPaint.setShader(make_bg_shader());
  62. }
  63. SkString name() override { return SkString("AARectsModes"); }
  64. void onDrawContent(SkCanvas* canvas) override {
  65. const SkRect bounds = SkRect::MakeWH(W, H);
  66. static const SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
  67. canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
  68. for (int alpha = 0; alpha < 4; ++alpha) {
  69. canvas->save();
  70. canvas->save();
  71. for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
  72. if (6 == i) {
  73. canvas->restore();
  74. canvas->translate(W * 5, 0);
  75. canvas->save();
  76. }
  77. canvas->drawRect(bounds, fBGPaint);
  78. canvas->saveLayer(&bounds, nullptr);
  79. SkScalar dy = drawCell(canvas, gModes[i], gAlphaValue[alpha & 1],
  80. gAlphaValue[alpha & 2]);
  81. canvas->restore();
  82. canvas->translate(0, dy * 5 / 4);
  83. }
  84. canvas->restore();
  85. canvas->restore();
  86. canvas->translate(W * 5 / 4, 0);
  87. }
  88. }
  89. };
  90. DEF_SAMPLE( return new AARectsModesView(); )