blob: 95d2866fdc5e5a2d709d0603c7ed25bb37cf52e6 (
plain)
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
|
/*
* 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 "SkSRGB.h"
#include "SkTypes.h"
#include "Test.h"
#include <math.h>
static uint8_t linear_to_srgb(float l) {
return (uint8_t)roundf(sk_linear_to_srgb(Sk4f{l})[0]);
}
DEF_TEST(sk_linear_to_srgb, r) {
// Should map 0 -> 0 and 1 -> 1.
REPORTER_ASSERT(r, 0 == linear_to_srgb(0.0f));
REPORTER_ASSERT(r, 255 == linear_to_srgb(1.0f));
// Should be monotonic between 0 and 1.
// We don't bother checking denorm values.
int tolerated_regressions = 0;
#if defined(SK_ARM_HAS_NEON)
// Values around 0.166016 are usually 72 but drop briefly (41 floats) down to 71.
tolerated_regressions = 1;
#endif
uint8_t prev = 0;
for (float f = FLT_MIN; f <= 1.0f; ) {
uint8_t srgb = linear_to_srgb(f);
REPORTER_ASSERT(r, srgb >= prev || tolerated_regressions > 0);
if (srgb < prev) { tolerated_regressions--; }
prev = srgb;
union { float flt; uint32_t bits; } pun = { f };
pun.bits++;
f = pun.flt;
}
}
|
