9707a7e51c
Change-Id: I0cb383eb6ea5a302627f93b90182a7286c2c0995 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/212280 Reviewed-by: Hal Canary <halcanary@google.com> Commit-Queue: Ben Wagner <bungeman@google.com>
75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/*
|
|
* Copyright 2011 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#include "include/core/SkColor.h"
|
|
#include "include/core/SkTypes.h"
|
|
#include "include/core/SkUnPreMultiply.h"
|
|
#include "include/private/SkColorData.h"
|
|
#include "include/utils/SkRandom.h"
|
|
#include "src/core/SkMathPriv.h"
|
|
#include "tests/Test.h"
|
|
|
|
DEF_TEST(ColorPremul, reporter) {
|
|
for (int a = 0; a <= 255; a++) {
|
|
for (int x = 0; x <= 255; x++) {
|
|
SkColor c0 = SkColorSetARGB(a, x, x, x);
|
|
SkPMColor p0 = SkPreMultiplyColor(c0);
|
|
|
|
SkColor c1 = SkUnPreMultiply::PMColorToColor(p0);
|
|
SkPMColor p1 = SkPreMultiplyColor(c1);
|
|
|
|
// we can't promise that c0 == c1, since c0 -> p0 is a many to one
|
|
// function, however, we can promise that p0 -> c1 -> p1 : p0 == p1
|
|
REPORTER_ASSERT(reporter, p0 == p1);
|
|
|
|
{
|
|
int ax = SkMulDiv255Ceiling(x, a);
|
|
REPORTER_ASSERT(reporter, ax <= a);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
This test fails: SkFourByteInterp does *not* preserve opaque destinations.
|
|
SkAlpha255To256 implemented as (alpha + 1) is faster than
|
|
(alpha + (alpha >> 7)), but inaccurate, and Skia intends to phase it out.
|
|
*/
|
|
DEF_TEST(ColorInterp, reporter) {
|
|
SkRandom r;
|
|
|
|
U8CPU a0 = 0;
|
|
U8CPU a255 = 255;
|
|
for (int i = 0; i < 200; i++) {
|
|
SkColor colorSrc = r.nextU();
|
|
SkColor colorDst = r.nextU();
|
|
SkPMColor src = SkPreMultiplyColor(colorSrc);
|
|
SkPMColor dst = SkPreMultiplyColor(colorDst);
|
|
|
|
if (false) {
|
|
REPORTER_ASSERT(reporter, SkFourByteInterp(src, dst, a0) == dst);
|
|
REPORTER_ASSERT(reporter, SkFourByteInterp(src, dst, a255) == src);
|
|
}
|
|
}
|
|
}
|
|
|
|
DEF_TEST(ColorFastIterp, reporter) {
|
|
SkRandom r;
|
|
|
|
U8CPU a0 = 0;
|
|
U8CPU a255 = 255;
|
|
for (int i = 0; i < 200; i++) {
|
|
SkColor colorSrc = r.nextU();
|
|
SkColor colorDst = r.nextU();
|
|
SkPMColor src = SkPreMultiplyColor(colorSrc);
|
|
SkPMColor dst = SkPreMultiplyColor(colorDst);
|
|
|
|
REPORTER_ASSERT(reporter, SkFastFourByteInterp(src, dst, a0) == dst);
|
|
REPORTER_ASSERT(reporter, SkFastFourByteInterp(src, dst, a255) == src);
|
|
}
|
|
}
|