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/*
* 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)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++;
f = pun.flt;
}
}
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