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