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1 | |
2 /* | 1 /* |
3 * Copyright 2011 Google Inc. | 2 * Copyright 2011 Google Inc. |
4 * | 3 * |
5 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
6 * found in the LICENSE file. | 5 * found in the LICENSE file. |
7 */ | 6 */ |
| 7 |
8 #include "Test.h" | 8 #include "Test.h" |
| 9 #include "TestClassDef.h" |
9 #include "SkColorPriv.h" | 10 #include "SkColorPriv.h" |
10 #include "SkXfermode.h" | 11 #include "SkXfermode.h" |
11 | 12 |
12 // our std SkAlpha255To256 | 13 // our std SkAlpha255To256 |
13 static int test_srcover0(unsigned dst, unsigned alpha) { | 14 static int test_srcover0(unsigned dst, unsigned alpha) { |
14 return alpha + SkAlphaMul(dst, SkAlpha255To256(255 - alpha)); | 15 return alpha + SkAlphaMul(dst, SkAlpha255To256(255 - alpha)); |
15 } | 16 } |
16 | 17 |
17 // faster hack +1 | 18 // faster hack +1 |
18 static int test_srcover1(unsigned dst, unsigned alpha) { | 19 static int test_srcover1(unsigned dst, unsigned alpha) { |
19 return alpha + SkAlphaMul(dst, 256 - alpha); | 20 return alpha + SkAlphaMul(dst, 256 - alpha); |
20 } | 21 } |
21 | 22 |
22 // slower "correct" | 23 // slower "correct" |
23 static int test_srcover2(unsigned dst, unsigned alpha) { | 24 static int test_srcover2(unsigned dst, unsigned alpha) { |
24 return alpha + SkMulDiv255Round(dst, 255 - alpha); | 25 return alpha + SkMulDiv255Round(dst, 255 - alpha); |
25 } | 26 } |
26 | 27 |
27 static void test_srcover_hack(skiatest::Reporter* reporter) { | 28 DEF_TEST(SrcOver, reporter) { |
28 /* Here's the idea. Can we ensure that when we blend on top of an opaque | 29 /* Here's the idea. Can we ensure that when we blend on top of an opaque |
29 dst, that the result always stay's opaque (i.e. exactly 255)? | 30 dst, that the result always stay's opaque (i.e. exactly 255)? |
30 */ | 31 */ |
31 | 32 |
32 unsigned i; | 33 unsigned i; |
33 int opaqueCounter0 = 0; | 34 int opaqueCounter0 = 0; |
34 int opaqueCounter1 = 0; | 35 int opaqueCounter1 = 0; |
35 int opaqueCounter2 = 0; | 36 int opaqueCounter2 = 0; |
36 for (i = 0; i <= 255; i++) { | 37 for (i = 0; i <= 255; i++) { |
37 unsigned result0 = test_srcover0(0xFF, i); | 38 unsigned result0 = test_srcover0(0xFF, i); |
(...skipping 29 matching lines...) Expand all Loading... |
67 #if 0 | 68 #if 0 |
68 // this shows where r1 (faster) differs from r2 (more exact) | 69 // this shows where r1 (faster) differs from r2 (more exact) |
69 if (r1 != r2) { | 70 if (r1 != r2) { |
70 SkDebugf("--- dst=%d i=%d r1=%d r2=%d exact=%g\n", | 71 SkDebugf("--- dst=%d i=%d r1=%d r2=%d exact=%g\n", |
71 dst, i, r1, r2, i + dst - dst*i/255.0f); | 72 dst, i, r1, r2, i + dst - dst*i/255.0f); |
72 } | 73 } |
73 #endif | 74 #endif |
74 } | 75 } |
75 } | 76 } |
76 } | 77 } |
77 | |
78 #include "TestClassDef.h" | |
79 DEFINE_TESTCLASS("SrcOver", SrcOverTestClass, test_srcover_hack) | |
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