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1 #include "Test.h"
2 
3 #include "SkColorPriv.h"
4 
5 #define ASSERT(expr) REPORTER_ASSERT(r, expr)
6 
DEF_TEST(Splay,r)7 DEF_TEST(Splay, r) {
8     const SkPMColor color = 0xA1B2C3D4;
9 
10     uint32_t ag, rb;
11     SkSplay(color, &ag, &rb);
12     ASSERT(ag == 0x00A100C3);
13     ASSERT(rb == 0x00B200D4);
14     ASSERT(SkUnsplay(ag << 8, rb << 8) == color);
15 
16     const uint64_t agrb = SkSplay(color);
17     ASSERT(agrb == 0x00A100C300B200D4ULL);
18     ASSERT(SkUnsplay(agrb<<8) == color);
19 }
20 
DEF_TEST(FourByteInterp,r)21 DEF_TEST(FourByteInterp, r) {
22     const SkPMColor src = 0xAB998877, dst = 0x66334455;
23     for (unsigned scale = 0; scale <= 256; scale++) {
24         ASSERT(SkFourByteInterp256(src, dst, scale) == SkFastFourByteInterp256(src, dst, scale));
25     }
26 
27     for (unsigned scale = 0; scale < 256; scale++) {
28         // SkFourByteInterp and SkFastFourByteInterp convert from [0, 255] to [0, 256] differently.
29         // In particular, slow may end up a little too high (weirdly, fast is more accurate).
30         const SkPMColor slow = SkFourByteInterp(src, dst, scale);
31         const SkPMColor fast = SkFastFourByteInterp(src, dst, scale);
32 
33         const int deltaA = SkGetPackedA32(slow) - SkGetPackedA32(fast);
34         const int deltaR = SkGetPackedR32(slow) - SkGetPackedR32(fast);
35         const int deltaG = SkGetPackedG32(slow) - SkGetPackedG32(fast);
36         const int deltaB = SkGetPackedB32(slow) - SkGetPackedB32(fast);
37 
38         ASSERT(deltaA == 0 || deltaA == 1);
39         ASSERT(deltaR == 0 || deltaR == 1);
40         ASSERT(deltaG == 0 || deltaG == 1);
41         ASSERT(deltaB == 0 || deltaB == 1);
42     }
43 }
44