1 /*
2 * Copyright 2017 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
8 #include "Test.h"
9
10 #include "SkColorData.h"
11
12 #define ASSERT(expr) REPORTER_ASSERT(r, expr)
13
DEF_TEST(Splay,r)14 DEF_TEST(Splay, r) {
15 const SkPMColor color = 0xA1B2C3D4;
16
17 uint32_t ag, rb;
18 SkSplay(color, &ag, &rb);
19 ASSERT(ag == 0x00A100C3);
20 ASSERT(rb == 0x00B200D4);
21 ASSERT(SkUnsplay(ag << 8, rb << 8) == color);
22
23 const uint64_t agrb = SkSplay(color);
24 ASSERT(agrb == 0x00A100C300B200D4ULL);
25 ASSERT(SkUnsplay(agrb<<8) == color);
26 }
27
DEF_TEST(FourByteInterp,r)28 DEF_TEST(FourByteInterp, r) {
29 const SkPMColor src = 0xAB998877, dst = 0x66334455;
30 for (unsigned scale = 0; scale <= 256; scale++) {
31 ASSERT(SkFourByteInterp256(src, dst, scale) == SkFastFourByteInterp256(src, dst, scale));
32 }
33
34 for (unsigned scale = 0; scale < 256; scale++) {
35 // SkFourByteInterp and SkFastFourByteInterp convert from [0, 255] to [0, 256] differently.
36 // In particular, slow may end up a little too high (weirdly, fast is more accurate).
37 const SkPMColor slow = SkFourByteInterp(src, dst, scale);
38 const SkPMColor fast = SkFastFourByteInterp(src, dst, scale);
39
40 const int deltaA = SkGetPackedA32(slow) - SkGetPackedA32(fast);
41 const int deltaR = SkGetPackedR32(slow) - SkGetPackedR32(fast);
42 const int deltaG = SkGetPackedG32(slow) - SkGetPackedG32(fast);
43 const int deltaB = SkGetPackedB32(slow) - SkGetPackedB32(fast);
44
45 ASSERT(deltaA == 0 || deltaA == 1);
46 ASSERT(deltaR == 0 || deltaR == 1);
47 ASSERT(deltaG == 0 || deltaG == 1);
48 ASSERT(deltaB == 0 || deltaB == 1);
49 }
50 }
51