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 "SkColor.h"
9 #include "SkColorData.h"
10 #include "SkColorPriv.h"
11 #include "SkTypes.h"
12 #include "Test.h"
13
14 #define ASSERT(expr) REPORTER_ASSERT(r, expr)
15
DEF_TEST(Splay,r)16 DEF_TEST(Splay, r) {
17 const SkPMColor color = 0xA1B2C3D4;
18
19 uint32_t ag, rb;
20 SkSplay(color, &ag, &rb);
21 ASSERT(ag == 0x00A100C3);
22 ASSERT(rb == 0x00B200D4);
23 ASSERT(SkUnsplay(ag << 8, rb << 8) == color);
24
25 const uint64_t agrb = SkSplay(color);
26 ASSERT(agrb == 0x00A100C300B200D4ULL);
27 ASSERT(SkUnsplay(agrb<<8) == color);
28 }
29
DEF_TEST(FourByteInterp,r)30 DEF_TEST(FourByteInterp, r) {
31 const SkPMColor src = 0xAB998877, dst = 0x66334455;
32 for (unsigned scale = 0; scale <= 256; scale++) {
33 ASSERT(SkFourByteInterp256(src, dst, scale) == SkFastFourByteInterp256(src, dst, scale));
34 }
35
36 for (unsigned scale = 0; scale < 256; scale++) {
37 // SkFourByteInterp and SkFastFourByteInterp convert from [0, 255] to [0, 256] differently.
38 // In particular, slow may end up a little too high (weirdly, fast is more accurate).
39 const SkPMColor slow = SkFourByteInterp(src, dst, scale);
40 const SkPMColor fast = SkFastFourByteInterp(src, dst, scale);
41
42 const int deltaA = SkGetPackedA32(slow) - SkGetPackedA32(fast);
43 const int deltaR = SkGetPackedR32(slow) - SkGetPackedR32(fast);
44 const int deltaG = SkGetPackedG32(slow) - SkGetPackedG32(fast);
45 const int deltaB = SkGetPackedB32(slow) - SkGetPackedB32(fast);
46
47 ASSERT(deltaA == 0 || deltaA == 1);
48 ASSERT(deltaR == 0 || deltaR == 1);
49 ASSERT(deltaG == 0 || deltaG == 1);
50 ASSERT(deltaB == 0 || deltaB == 1);
51 }
52 }
53