aaa.cpp 4.9 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/SkPath.h"
  12. #include "include/core/SkScalar.h"
  13. #include "include/private/SkFloatBits.h"
  14. #define W 800
  15. #define H 800
  16. DEF_SIMPLE_GM(analytic_antialias_convex, canvas, W, H) {
  17. SkPaint p;
  18. p.setColor(SK_ColorRED);
  19. p.setAntiAlias(true);
  20. canvas->clear(0xFFFFFFFF);
  21. canvas->save();
  22. SkScalar y = 0;
  23. canvas->translate(0, y);
  24. canvas->rotate(1);
  25. canvas->drawRect({ 20, 20, 200, 200 }, p);
  26. canvas->restore();
  27. y += 200;
  28. canvas->save();
  29. canvas->translate(0, y);
  30. canvas->rotate(1);
  31. canvas->drawRect({ 20, 20, 20.2f, 200 }, p);
  32. canvas->drawRect({ 20, 200, 200, 200.1f }, p);
  33. canvas->drawCircle(100, 100, 30, p);
  34. canvas->restore();
  35. // The following path is empty but it'll reveal bug chrome:662914
  36. SkPath path;
  37. path.moveTo(SkBits2Float(0x429b9d5c), SkBits2Float(0x4367a041)); // 77.8073f, 231.626f
  38. // 77.8075f, 231.626f, 77.8074f, 231.625f, 77.8073f, 231.625f
  39. path.cubicTo(SkBits2Float(0x429b9d71), SkBits2Float(0x4367a022),
  40. SkBits2Float(0x429b9d64), SkBits2Float(0x4367a009),
  41. SkBits2Float(0x429b9d50), SkBits2Float(0x43679ff2));
  42. path.lineTo(SkBits2Float(0x429b9d5c), SkBits2Float(0x4367a041)); // 77.8073f, 231.626f
  43. path.close();
  44. canvas->drawPath(path, p);
  45. // The following path reveals a subtle SkAnalyticQuadraticEdge::updateQuadratic bug:
  46. // we should not use any snapped y for the intermediate values whose error may accumulate;
  47. // snapping should only be allowed once before updateLine.
  48. path.reset();
  49. path.moveTo(SkBits2Float(0x434ba71e), SkBits2Float(0x438a06d0)); // 203.653f, 276.053f
  50. path.lineTo(SkBits2Float(0x43492a74), SkBits2Float(0x4396d70d)); // 201.166f, 301.68f
  51. // 200.921f, 304.207f, 196.939f, 303.82f, 0.707107f
  52. path.conicTo(SkBits2Float(0x4348ebaf), SkBits2Float(0x43981a75),
  53. SkBits2Float(0x4344f079), SkBits2Float(0x4397e900), SkBits2Float(0x3f3504f3));
  54. path.close();
  55. // Manually setting convexity is required. Otherwise, this path will be considered concave.
  56. path.setConvexity(SkPath::kConvex_Convexity);
  57. canvas->drawPath(path, p);
  58. // skbug.com/7573
  59. y += 200;
  60. canvas->save();
  61. canvas->translate(0, y);
  62. p.setAntiAlias(true);
  63. path.reset();
  64. path.moveTo(1.98009784f, 9.0162744f);
  65. path.lineTo(47.843992f, 10.1922744f);
  66. path.lineTo(47.804008f, 11.7597256f);
  67. path.lineTo(1.93990216f, 10.5837256f);
  68. canvas->drawPath(path, p);
  69. canvas->restore();
  70. // skbug.com/7813
  71. // t8888 splits the 800-high canvas into 3 pieces; the boundary is close to 266 and 534
  72. path.reset();
  73. path.moveTo(700, 266);
  74. path.lineTo(710, 266);
  75. path.lineTo(710, 534);
  76. path.lineTo(700, 534);
  77. canvas->drawPath(path, p);
  78. }
  79. DEF_SIMPLE_GM(analytic_antialias_general, canvas, W, H) {
  80. SkPaint p;
  81. p.setColor(SK_ColorRED);
  82. p.setAntiAlias(true);
  83. canvas->clear(0xFFFFFFFF);
  84. canvas->save();
  85. canvas->rotate(1);
  86. const SkScalar R = 115.2f, C = 128.0f;
  87. SkPath path;
  88. path.moveTo(C + R, C);
  89. for (int i = 1; i < 8; ++i) {
  90. SkScalar a = 2.6927937f * i;
  91. path.lineTo(C + R * SkScalarCos(a), C + R * SkScalarSin(a));
  92. }
  93. canvas->drawPath(path, p);
  94. canvas->restore();
  95. canvas->save();
  96. canvas->translate(200, 0);
  97. canvas->rotate(1);
  98. p.setStyle(SkPaint::kStroke_Style);
  99. p.setStrokeWidth(5);
  100. canvas->drawPath(path, p);
  101. canvas->restore();
  102. // The following two paths test if we correctly cumulates the alpha on the middle pixel
  103. // column where the left rect and the right rect abut.
  104. p.setStyle(SkPaint::kFill_Style);
  105. canvas->translate(0, 300);
  106. path.reset();
  107. path.addRect({20, 20, 100.4999f, 100});
  108. path.addRect({100.5001f, 20, 200, 100});
  109. canvas->drawPath(path, p);
  110. canvas->translate(300, 0);
  111. path.reset();
  112. path.addRect({20, 20, 100.1f, 100});
  113. path.addRect({100.9f, 20, 200, 100});
  114. canvas->drawPath(path, p);
  115. }
  116. DEF_SIMPLE_GM(analytic_antialias_inverse, canvas, W, H) {
  117. SkPaint p;
  118. p.setColor(SK_ColorRED);
  119. p.setAntiAlias(true);
  120. canvas->save();
  121. SkPath path;
  122. path.addCircle(100, 100, 30);
  123. path.setFillType(SkPath::kInverseWinding_FillType);
  124. canvas->drawPath(path, p);
  125. canvas->restore();
  126. }