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- /*
- * 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);
- }
- }
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