зеркало из https://github.com/mozilla/moz-skia.git
85 строки
2.6 KiB
C++
85 строки
2.6 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 "Test.h"
|
|
#include "SkColor.h"
|
|
#include "SkColorPriv.h"
|
|
#include "SkMathPriv.h"
|
|
#include "SkRandom.h"
|
|
#include "SkUnPreMultiply.h"
|
|
|
|
#define GetPackedR16As32(packed) (SkGetPackedR16(dc) << (8 - SK_R16_BITS))
|
|
#define GetPackedG16As32(packed) (SkGetPackedG16(dc) << (8 - SK_G16_BITS))
|
|
#define GetPackedB16As32(packed) (SkGetPackedB16(dc) << (8 - SK_B16_BITS))
|
|
|
|
static inline void test_premul(skiatest::Reporter* 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.
|
|
*/
|
|
/*
|
|
static void test_interp(skiatest::Reporter* 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, SkFourByteInterp(src, dst, a0) == dst);
|
|
REPORTER_ASSERT(reporter, SkFourByteInterp(src, dst, a255) == src);
|
|
}
|
|
}
|
|
*/
|
|
|
|
static inline void test_fast_interp(skiatest::Reporter* 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);
|
|
}
|
|
}
|
|
|
|
DEF_TEST(Color, reporter) {
|
|
test_premul(reporter);
|
|
//test_interp(reporter);
|
|
test_fast_interp(reporter);
|
|
//test_565blend();
|
|
}
|