| /* |
| * 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/private/base/SkCPUTypes.h" |
| #include "src/base/SkMathPriv.h" |
| #include "src/base/SkRandom.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); |
| } |
| } |