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Diffstat (limited to 'tests/SRGBTest.cpp')
-rw-r--r-- | tests/SRGBTest.cpp | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/tests/SRGBTest.cpp b/tests/SRGBTest.cpp index cf8aaa120b..44daeda34a 100644 --- a/tests/SRGBTest.cpp +++ b/tests/SRGBTest.cpp @@ -13,6 +13,34 @@ #include <math.h> #include "../src/jumper/SkJumper.h" +static uint8_t linear_to_srgb(float l) { + return (uint8_t)sk_linear_to_srgb(Sk4f{l})[0]; +} + +DEF_TEST(sk_linear_to_srgb, r) { + // All bytes should round trip. + for (int i = 0; i < 256; i++) { + int actual = linear_to_srgb(sk_linear_from_srgb[i]); + if (i != actual) { + ERRORF(r, "%d -> %d\n", i, actual); + } + } + + // Should be monotonic between 0 and 1. + uint8_t prev = 0; + for (float f = FLT_MIN; f <= 1.0f; ) { // We don't bother checking denorm values. + uint8_t srgb = linear_to_srgb(f); + + REPORTER_ASSERT(r, srgb >= prev); + prev = srgb; + + union { float flt; uint32_t bits; } pun = { f }; + pun.bits++; + SkDEBUGCODE(pun.bits += 127); + f = pun.flt; + } +} + DEF_TEST(sk_pipeline_srgb_roundtrip, r) { uint32_t reds[256]; for (int i = 0; i < 256; i++) { |