mtklein | ac41bac | 2016-07-08 06:33:16 -0700 | [diff] [blame] | 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 | |
Mike Klein | ca2194b | 2017-05-15 18:03:52 -0400 | [diff] [blame] | 8 | #include "SkRasterPipeline.h" |
mtklein | ac41bac | 2016-07-08 06:33:16 -0700 | [diff] [blame] | 9 | #include "SkSRGB.h" |
| 10 | #include "SkTypes.h" |
| 11 | #include "Test.h" |
| 12 | #include <math.h> |
| 13 | |
| 14 | static uint8_t linear_to_srgb(float l) { |
mtklein | 566ea9b | 2016-07-20 12:10:11 -0700 | [diff] [blame] | 15 | return (uint8_t)sk_linear_to_srgb(Sk4f{l})[0]; |
mtklein | ac41bac | 2016-07-08 06:33:16 -0700 | [diff] [blame] | 16 | } |
| 17 | |
| 18 | DEF_TEST(sk_linear_to_srgb, r) { |
mtklein | 566ea9b | 2016-07-20 12:10:11 -0700 | [diff] [blame] | 19 | // All bytes should round trip. |
| 20 | for (int i = 0; i < 256; i++) { |
| 21 | int actual = linear_to_srgb(sk_linear_from_srgb[i]); |
| 22 | if (i != actual) { |
| 23 | ERRORF(r, "%d -> %d\n", i, actual); |
| 24 | } |
| 25 | } |
mtklein | ac41bac | 2016-07-08 06:33:16 -0700 | [diff] [blame] | 26 | |
| 27 | // Should be monotonic between 0 and 1. |
mtklein | ac41bac | 2016-07-08 06:33:16 -0700 | [diff] [blame] | 28 | uint8_t prev = 0; |
mtklein | 566ea9b | 2016-07-20 12:10:11 -0700 | [diff] [blame] | 29 | for (float f = FLT_MIN; f <= 1.0f; ) { // We don't bother checking denorm values. |
mtklein | ac41bac | 2016-07-08 06:33:16 -0700 | [diff] [blame] | 30 | uint8_t srgb = linear_to_srgb(f); |
| 31 | |
mtklein | 566ea9b | 2016-07-20 12:10:11 -0700 | [diff] [blame] | 32 | REPORTER_ASSERT(r, srgb >= prev); |
mtklein | ac41bac | 2016-07-08 06:33:16 -0700 | [diff] [blame] | 33 | prev = srgb; |
| 34 | |
| 35 | union { float flt; uint32_t bits; } pun = { f }; |
| 36 | pun.bits++; |
mtklein | af06420 | 2016-08-08 05:52:55 -0700 | [diff] [blame] | 37 | SkDEBUGCODE(pun.bits += 127); |
mtklein | ac41bac | 2016-07-08 06:33:16 -0700 | [diff] [blame] | 38 | f = pun.flt; |
| 39 | } |
| 40 | } |
Mike Klein | ca2194b | 2017-05-15 18:03:52 -0400 | [diff] [blame] | 41 | |
| 42 | DEF_TEST(sk_pipeline_srgb_roundtrip, r) { |
| 43 | uint32_t reds[256]; |
| 44 | for (int i = 0; i < 256; i++) { |
| 45 | reds[i] = i; |
| 46 | } |
| 47 | |
| 48 | auto ptr = (void*)reds; |
| 49 | |
Mike Klein | b24704d | 2017-05-24 07:53:00 -0400 | [diff] [blame^] | 50 | SkRasterPipeline_<256> p; |
Mike Klein | ca2194b | 2017-05-15 18:03:52 -0400 | [diff] [blame] | 51 | p.append(SkRasterPipeline::load_8888, &ptr); |
| 52 | p.append_from_srgb(kUnpremul_SkAlphaType); |
| 53 | p.append(SkRasterPipeline::to_srgb); |
| 54 | p.append(SkRasterPipeline::store_8888, &ptr); |
| 55 | |
| 56 | p.run(0,256); |
| 57 | |
| 58 | for (int i = 0; i < 256; i++) { |
| 59 | if (reds[i] != (uint32_t)i) { |
| 60 | ERRORF(r, "%d doesn't round trip, %d", i, reds[i]); |
| 61 | } |
| 62 | } |
| 63 | } |