hairmodes.cpp 3.9 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 "gm/gm.h"
  8. #include "include/core/SkBitmap.h"
  9. #include "include/core/SkBlendMode.h"
  10. #include "include/core/SkCanvas.h"
  11. #include "include/core/SkColor.h"
  12. #include "include/core/SkColorPriv.h"
  13. #include "include/core/SkMatrix.h"
  14. #include "include/core/SkPaint.h"
  15. #include "include/core/SkRect.h"
  16. #include "include/core/SkRefCnt.h"
  17. #include "include/core/SkScalar.h"
  18. #include "include/core/SkShader.h"
  19. #include "include/core/SkSize.h"
  20. #include "include/core/SkString.h"
  21. #include "include/core/SkTileMode.h"
  22. #include "include/core/SkTypes.h"
  23. constexpr SkBlendMode gModes[] = {
  24. SkBlendMode::kClear,
  25. SkBlendMode::kSrc,
  26. SkBlendMode::kDst,
  27. SkBlendMode::kSrcOver,
  28. SkBlendMode::kDstOver,
  29. SkBlendMode::kSrcIn,
  30. SkBlendMode::kDstIn,
  31. SkBlendMode::kSrcOut,
  32. SkBlendMode::kDstOut,
  33. SkBlendMode::kSrcATop,
  34. SkBlendMode::kDstATop,
  35. SkBlendMode::kXor,
  36. };
  37. const int gWidth = 64;
  38. const int gHeight = 64;
  39. const SkScalar W = SkIntToScalar(gWidth);
  40. const SkScalar H = SkIntToScalar(gHeight);
  41. static SkScalar drawCell(SkCanvas* canvas, SkBlendMode mode, SkAlpha a0, SkAlpha a1) {
  42. SkPaint paint;
  43. paint.setAntiAlias(true);
  44. SkRect r = SkRect::MakeWH(W, H);
  45. r.inset(W/10, H/10);
  46. paint.setColor(SK_ColorBLUE);
  47. paint.setAlpha(a0);
  48. canvas->drawOval(r, paint);
  49. paint.setColor(SK_ColorRED);
  50. paint.setAlpha(a1);
  51. paint.setBlendMode(mode);
  52. for (int angle = 0; angle < 24; ++angle) {
  53. SkScalar x = SkScalarCos(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gWidth;
  54. SkScalar y = SkScalarSin(SkIntToScalar(angle) * (SK_ScalarPI * 2) / 24) * gHeight;
  55. paint.setStrokeWidth(SK_Scalar1 * angle * 2 / 24);
  56. canvas->drawLine(W/2, H/2, W/2 + x, H/2 + y, paint);
  57. }
  58. return H;
  59. }
  60. static sk_sp<SkShader> make_bg_shader() {
  61. SkBitmap bm;
  62. bm.allocN32Pixels(2, 2);
  63. *bm.getAddr32(0, 0) = *bm.getAddr32(1, 1) = 0xFFFFFFFF;
  64. *bm.getAddr32(1, 0) = *bm.getAddr32(0, 1) = SkPackARGB32(0xFF, 0xCE, 0xCF, 0xCE);
  65. SkMatrix m;
  66. m.setScale(SkIntToScalar(6), SkIntToScalar(6));
  67. return bm.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, &m);
  68. }
  69. namespace skiagm {
  70. class HairModesGM : public GM {
  71. SkPaint fBGPaint;
  72. protected:
  73. SkString onShortName() override {
  74. return SkString("hairmodes");
  75. }
  76. virtual SkISize onISize() override { return SkISize::Make(640, 480); }
  77. void onOnceBeforeDraw() override {
  78. fBGPaint.setShader(make_bg_shader());
  79. }
  80. void onDraw(SkCanvas* canvas) override {
  81. const SkRect bounds = SkRect::MakeWH(W, H);
  82. constexpr SkAlpha gAlphaValue[] = { 0xFF, 0x88, 0x88 };
  83. canvas->translate(SkIntToScalar(4), SkIntToScalar(4));
  84. for (int alpha = 0; alpha < 4; ++alpha) {
  85. canvas->save();
  86. canvas->save();
  87. for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); ++i) {
  88. if (6 == i) {
  89. canvas->restore();
  90. canvas->translate(W * 5, 0);
  91. canvas->save();
  92. }
  93. canvas->drawRect(bounds, fBGPaint);
  94. canvas->saveLayer(&bounds, nullptr);
  95. SkScalar dy = drawCell(canvas, gModes[i],
  96. gAlphaValue[alpha & 1],
  97. gAlphaValue[alpha & 2]);
  98. canvas->restore();
  99. canvas->translate(0, dy * 5 / 4);
  100. }
  101. canvas->restore();
  102. canvas->restore();
  103. canvas->translate(W * 5 / 4, 0);
  104. }
  105. }
  106. private:
  107. typedef GM INHERITED;
  108. };
  109. //////////////////////////////////////////////////////////////////////////////
  110. DEF_GM( return new HairModesGM; )
  111. }