NonlinearBlendingTest.cpp 2.8 KB

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  1. /*
  2. * Copyright 2018 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/SkColorSpace.h"
  8. #include "include/third_party/skcms/skcms.h"
  9. #include "src/core/SkColorSpaceXformSteps.h"
  10. #include "tests/Test.h"
  11. DEF_TEST(SkColorSpaceXformSteps_vs_skcms, r) {
  12. auto srgb = SkColorSpace::MakeSRGB();
  13. auto dp3 = SkColorSpace::MakeRGB(SkNamedTransferFn::kSRGB, SkNamedGamut::kDCIP3);
  14. skcms_ICCProfile srgb_profile;
  15. srgb->toProfile(&srgb_profile);
  16. skcms_ICCProfile dp3_profile;
  17. dp3->toProfile(&dp3_profile);
  18. // These colors provide a good spread of interesting test cases.
  19. SkColor colors[] = {
  20. 0xffff0000, 0x7fff0000, 0x7f7f0000,
  21. 0xff00ff00, 0x7f00ff00, 0x7f007f00,
  22. };
  23. for (auto color : colors) {
  24. auto bgra = skcms_PixelFormat_BGRA_8888,
  25. f32 = skcms_PixelFormat_RGBA_ffff;
  26. auto unpremul = skcms_AlphaFormat_Unpremul,
  27. premul = skcms_AlphaFormat_PremulAsEncoded;
  28. float via_skcms[4];
  29. skcms_Transform(&color, bgra, unpremul, &srgb_profile,
  30. &via_skcms, f32, premul, &dp3_profile,
  31. 1);
  32. SkColorSpaceXformSteps steps(srgb.get(), kUnpremul_SkAlphaType,
  33. dp3.get(), kPremul_SkAlphaType);
  34. float via_steps[4] = {
  35. SkColorGetR(color) * (1 / 255.0f),
  36. SkColorGetG(color) * (1 / 255.0f),
  37. SkColorGetB(color) * (1 / 255.0f),
  38. SkColorGetA(color) * (1 / 255.0f),
  39. };
  40. steps.apply(via_steps);
  41. REPORTER_ASSERT(r, fabsf(via_skcms[0] - via_steps[0]) <= 0.005f);
  42. REPORTER_ASSERT(r, fabsf(via_skcms[1] - via_steps[1]) <= 0.005f);
  43. REPORTER_ASSERT(r, fabsf(via_skcms[2] - via_steps[2]) <= 0.005f);
  44. REPORTER_ASSERT(r, fabsf(via_skcms[3] - via_steps[3]) <= 0.0f);
  45. // Now go back using the other method's inverse transform
  46. float steps_to_skcms[4];
  47. skcms_Transform(via_steps, f32, premul, &dp3_profile,
  48. steps_to_skcms, f32, premul, &srgb_profile,
  49. 1);
  50. float skcms_to_steps[4] = { via_skcms[0], via_skcms[1], via_skcms[2], via_skcms[3] };
  51. SkColorSpaceXformSteps inv_steps(dp3.get(), kPremul_SkAlphaType,
  52. srgb.get(), kPremul_SkAlphaType);
  53. inv_steps.apply(skcms_to_steps);
  54. REPORTER_ASSERT(r, fabsf(skcms_to_steps[0] - steps_to_skcms[0]) <= 0.005f);
  55. REPORTER_ASSERT(r, fabsf(skcms_to_steps[1] - steps_to_skcms[1]) <= 0.005f);
  56. REPORTER_ASSERT(r, fabsf(skcms_to_steps[2] - steps_to_skcms[2]) <= 0.005f);
  57. REPORTER_ASSERT(r, fabsf(skcms_to_steps[3] - steps_to_skcms[3]) <= 0.0f);
  58. }
  59. }