ShaderOpacityTest.cpp 3.2 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/SkShader.h"
  9. #include "include/effects/SkGradientShader.h"
  10. #include "src/shaders/SkColorShader.h"
  11. #include "tests/Test.h"
  12. static void test_bitmap(skiatest::Reporter* reporter) {
  13. SkImageInfo info = SkImageInfo::MakeN32Premul(2, 2);
  14. SkBitmap bmp;
  15. bmp.setInfo(info);
  16. // test 1: bitmap without pixel data
  17. auto shader = bmp.makeShader(SkTileMode::kClamp, SkTileMode::kClamp);
  18. REPORTER_ASSERT(reporter, shader);
  19. REPORTER_ASSERT(reporter, !shader->isOpaque());
  20. // From this point on, we have pixels
  21. bmp.allocPixels(info);
  22. // test 2: not opaque by default
  23. shader = bmp.makeShader();
  24. REPORTER_ASSERT(reporter, shader);
  25. REPORTER_ASSERT(reporter, !shader->isOpaque());
  26. // test 3: explicitly opaque
  27. bmp.setAlphaType(kOpaque_SkAlphaType);
  28. shader = bmp.makeShader();
  29. REPORTER_ASSERT(reporter, shader);
  30. REPORTER_ASSERT(reporter, shader->isOpaque());
  31. // test 4: explicitly not opaque
  32. bmp.setAlphaType(kPremul_SkAlphaType);
  33. shader = bmp.makeShader();
  34. REPORTER_ASSERT(reporter, shader);
  35. REPORTER_ASSERT(reporter, !shader->isOpaque());
  36. }
  37. static void test_gradient(skiatest::Reporter* reporter) {
  38. SkPoint pts[2];
  39. pts[0].iset(0, 0);
  40. pts[1].iset(1, 0);
  41. SkColor colors[2];
  42. SkScalar pos[2] = {SkIntToScalar(0), SkIntToScalar(1)};
  43. int count = 2;
  44. SkTileMode mode = SkTileMode::kClamp;
  45. // test 1: all opaque
  46. colors[0] = SkColorSetARGB(0xFF, 0, 0, 0);
  47. colors[1] = SkColorSetARGB(0xFF, 0, 0, 0);
  48. auto grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode);
  49. REPORTER_ASSERT(reporter, grad);
  50. REPORTER_ASSERT(reporter, grad->isOpaque());
  51. // test 2: all 0 alpha
  52. colors[0] = SkColorSetARGB(0, 0, 0, 0);
  53. colors[1] = SkColorSetARGB(0, 0, 0, 0);
  54. grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode);
  55. REPORTER_ASSERT(reporter, grad);
  56. REPORTER_ASSERT(reporter, !grad->isOpaque());
  57. // test 3: one opaque, one transparent
  58. colors[0] = SkColorSetARGB(0xFF, 0, 0, 0);
  59. colors[1] = SkColorSetARGB(0x40, 0, 0, 0);
  60. grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode);
  61. REPORTER_ASSERT(reporter, grad);
  62. REPORTER_ASSERT(reporter, !grad->isOpaque());
  63. // test 4: test 3, swapped
  64. colors[0] = SkColorSetARGB(0x40, 0, 0, 0);
  65. colors[1] = SkColorSetARGB(0xFF, 0, 0, 0);
  66. grad = SkGradientShader::MakeLinear(pts, colors, pos, count, mode);
  67. REPORTER_ASSERT(reporter, grad);
  68. REPORTER_ASSERT(reporter, !grad->isOpaque());
  69. }
  70. static void test_color(skiatest::Reporter* reporter) {
  71. SkColorShader colorShader1(SkColorSetARGB(0,0,0,0));
  72. REPORTER_ASSERT(reporter, !colorShader1.isOpaque());
  73. SkColorShader colorShader2(SkColorSetARGB(0xFF,0,0,0));
  74. REPORTER_ASSERT(reporter, colorShader2.isOpaque());
  75. SkColorShader colorShader3(SkColorSetARGB(0x7F,0,0,0));
  76. REPORTER_ASSERT(reporter, !colorShader3.isOpaque());
  77. }
  78. DEF_TEST(ShaderOpacity, reporter) {
  79. test_gradient(reporter);
  80. test_color(reporter);
  81. test_bitmap(reporter);
  82. }