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| 1 /* |
| 2 * Copyright 2013 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 #include "Test.h" |
| 8 #include "SkColorPriv.h" |
| 9 |
| 10 static bool next_color(SkColor& color) { |
| 11 unsigned a = SkColorGetA(color); |
| 12 unsigned r = SkColorGetR(color) + 3; |
| 13 unsigned g = SkColorGetG(color) + 3; |
| 14 unsigned b = SkColorGetB(color) + 3; |
| 15 if (r > 255) { |
| 16 r = g = b = 0; |
| 17 a += 3; |
| 18 if (a > 255) |
| 19 return false; |
| 20 } |
| 21 color = SkColorSetARGBInline(a, r, g, b); |
| 22 return true; |
| 23 } |
| 24 |
| 25 // If srcAlpha == 0 then dstOut == dstIn |
| 26 static void test_src_alpha_0(skiatest::Reporter* reporter) { |
| 27 SkColor srcIn = 0; |
| 28 SkColor dstIn = 0; |
| 29 do { |
| 30 if (!SkColorGetA(srcIn)) { |
| 31 do { |
| 32 SkPMColor srcInPM = SkPreMultiplyColor(srcIn); |
| 33 SkPMColor dstOut; |
| 34 |
| 35 dstOut = srcInPM + SkAlphaMulQ(dstIn, SkAlphaToScale(255 - SkGet
PackedA32(srcInPM))); |
| 36 REPORTER_ASSERT(reporter, dstOut == dstIn); |
| 37 |
| 38 dstOut = srcInPM + SkAlphaMulQ(dstIn, SkAlphaToInvScale8(SkGetPa
ckedA32(srcInPM))); |
| 39 REPORTER_ASSERT(reporter, dstOut == dstIn); |
| 40 |
| 41 SkPMColor16 srcInPM4444 = SkPixel32ToPixel4444(srcInPM); |
| 42 U16CPU dstIn4444 = SkPixel32ToPixel4444(dstIn); |
| 43 dstOut = srcInPM4444 + SkAlphaMulQ4(dstIn4444, SkAlphaToInvScale
4(SkGetPackedA4444(srcInPM4444))); |
| 44 REPORTER_ASSERT(reporter, dstOut == dstIn4444); |
| 45 } while (next_color(dstIn)); |
| 46 } |
| 47 } while (next_color(srcIn)); |
| 48 } |
| 49 |
| 50 // If srcAlpha == 0xff then dstOut == srcIn |
| 51 static void test_src_alpha_ff(skiatest::Reporter* reporter) { |
| 52 SkColor srcIn = 0; |
| 53 SkColor dstIn = 0; |
| 54 do { |
| 55 if (SkColorGetA(srcIn) == 0xff) { |
| 56 do { |
| 57 SkPMColor srcInPM = SkPreMultiplyColor(srcIn); |
| 58 SkPMColor dstOut; |
| 59 |
| 60 dstOut = srcInPM + SkAlphaMulQ(dstIn, SkAlphaToScale(255 - SkGet
PackedA32(srcInPM))); |
| 61 REPORTER_ASSERT(reporter, dstOut == srcInPM); |
| 62 dstOut = srcInPM + SkAlphaMulQ(dstIn, SkAlphaToInvScale8(SkGetPa
ckedA32(srcInPM))); |
| 63 REPORTER_ASSERT(reporter, dstOut == srcInPM); |
| 64 |
| 65 SkPMColor16 srcInPM4444 = SkPixel32ToPixel4444(srcInPM); |
| 66 U16CPU dstIn4444 = SkPixel32ToPixel4444(dstIn); |
| 67 dstOut = srcInPM4444 + SkAlphaMulQ4(dstIn4444, SkAlphaToInvScale
4(SkGetPackedA4444(srcInPM4444))); |
| 68 REPORTER_ASSERT(reporter, dstOut == srcInPM4444); |
| 69 } while (next_color(dstIn)); |
| 70 } |
| 71 } while (next_color(srcIn)); |
| 72 } |
| 73 |
| 74 // If dstAlpha == 0xff then dstOutAlpha == 0xff |
| 75 static void test_dst_alpha_ff(skiatest::Reporter* reporter) { |
| 76 SkColor srcIn = 0; |
| 77 SkColor dstIn = 0; |
| 78 do { |
| 79 if (SkColorGetA(dstIn) == 0xff) { |
| 80 do { |
| 81 SkPMColor srcInPM = SkPreMultiplyColor(srcIn); |
| 82 SkPMColor dstOut; |
| 83 |
| 84 dstOut = srcInPM + SkAlphaMulQ(dstIn, SkAlphaToScale(255 - SkGet
PackedA32(srcInPM))); |
| 85 REPORTER_ASSERT(reporter, SkGetPackedA32(dstOut) == 0xff); |
| 86 dstOut = srcInPM + SkAlphaMulQ(dstIn, SkAlphaToInvScale8(SkGetPa
ckedA32(srcInPM))); |
| 87 REPORTER_ASSERT(reporter, SkGetPackedA32(dstOut) == 0xff); |
| 88 |
| 89 SkPMColor16 srcInPM4444 = SkPixel32ToPixel4444(srcInPM); |
| 90 U16CPU dstIn4444 = SkPixel32ToPixel4444(dstIn); |
| 91 dstOut = srcInPM4444 + SkAlphaMulQ4(dstIn4444, SkAlphaToInvScale
4(SkGetPackedA4444(srcInPM4444))); |
| 92 REPORTER_ASSERT(reporter, SkGetPackedA4444(dstOut) == 0xf); |
| 93 } while (next_color(dstIn)); |
| 94 } |
| 95 } while (next_color(srcIn)); |
| 96 } |
| 97 |
| 98 static void TestAlphaScale(skiatest::Reporter* reporter) { |
| 99 test_src_alpha_0(reporter); |
| 100 test_src_alpha_ff(reporter); |
| 101 test_dst_alpha_ff(reporter); |
| 102 } |
| 103 |
| 104 #include "TestClassDef.h" |
| 105 DEFINE_TESTCLASS("AlphaScaleTest", TestAlphaScaleClass, TestAlphaScale) |
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