1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
/*
* 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_<256> 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]);
}
}
}
|
