1 /* 2 * Copyright 2016 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 8 #include "SkSRGB.h" 9 #include "SkTypes.h" 10 #include "Test.h" 11 #include <math.h> 12 linear_to_srgb(float l)13static uint8_t linear_to_srgb(float l) { 14 return (uint8_t)sk_linear_to_srgb(Sk4f{l})[0]; 15 } 16 DEF_TEST(sk_linear_to_srgb,r)17DEF_TEST(sk_linear_to_srgb, r) { 18 // All bytes should round trip. 19 for (int i = 0; i < 256; i++) { 20 int actual = linear_to_srgb(sk_linear_from_srgb[i]); 21 if (i != actual) { 22 ERRORF(r, "%d -> %d\n", i, actual); 23 } 24 } 25 26 // Should be monotonic between 0 and 1. 27 uint8_t prev = 0; 28 for (float f = FLT_MIN; f <= 1.0f; ) { // We don't bother checking denorm values. 29 uint8_t srgb = linear_to_srgb(f); 30 31 REPORTER_ASSERT(r, srgb >= prev); 32 prev = srgb; 33 34 union { float flt; uint32_t bits; } pun = { f }; 35 pun.bits++; 36 SkDEBUGCODE(pun.bits += 127); 37 f = pun.flt; 38 } 39 } 40