1#include "Test.h"
2
3#include "SkColorPriv.h"
4
5#define ASSERT(expr) REPORTER_ASSERT(r, expr)
6
7DEF_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
21DEF_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