75595d9392
git-svn-id: http://skia.googlecode.com/svn/trunk@1232 2bbb7eff-a529-9590-31e7-b0007b416f81
33 lines
945 B
C++
33 lines
945 B
C++
#include "Test.h"
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#include "SkColor.h"
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#include "SkUnPreMultiply.h"
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static void test_premul(skiatest::Reporter* reporter) {
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for (int a = 0; a <= 255; a++) {
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for (int x = 0; x <= 255; x++) {
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SkColor c0 = SkColorSetARGB(a, x, x, x);
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SkPMColor p0 = SkPreMultiplyColor(c0);
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SkColor c1 = SkUnPreMultiply::PMColorToColor(p0);
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SkPMColor p1 = SkPreMultiplyColor(c1);
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// we can't promise that c0 == c1, since c0 -> p0 is a many to one
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// function, however, we can promise that p0 -> c1 -> p1 : p0 == p1
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REPORTER_ASSERT(reporter, p0 == p1);
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{
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int ax = SkMulDiv255Ceiling(x, a);
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REPORTER_ASSERT(reporter, ax <= a);
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}
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}
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}
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}
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static void TestColor(skiatest::Reporter* reporter) {
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test_premul(reporter);
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}
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#include "TestClassDef.h"
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DEFINE_TESTCLASS("Color", ColorTestClass, TestColor)
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