skia2/tests/SRGBTest.cpp
Mike Klein b24704d35f SkRasterPipeline in SkArenaAlloc
Bug: skia:6673

Change-Id: Ia2bae4f6a9039a007a10b6b45bcf2f0854bf6e5c
Reviewed-on: https://skia-review.googlesource.com/17794
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
2017-05-24 14:54:15 +00:00

64 lines
1.5 KiB
C++

/*
* 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]);
}
}
}