| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkRasterPipeline.h" |
| #include "SkSRGB.h" |
| #include "SkTypes.h" |
| #include "Test.h" |
| #include <math.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++) { |
| reds[i] = i; |
| } |
| |
| auto ptr = (void*)reds; |
| |
| SkRasterPipeline p; |
| p.append(SkRasterPipeline::load_8888, &ptr); |
| p.append_from_srgb(kUnpremul_SkAlphaType); |
| p.append(SkRasterPipeline::to_srgb); |
| p.append(SkRasterPipeline::store_8888, &ptr); |
| |
| p.run(0,256); |
| |
| for (int i = 0; i < 256; i++) { |
| if (reds[i] != (uint32_t)i) { |
| ERRORF(r, "%d doesn't round trip, %d", i, reds[i]); |
| } |
| } |
| } |