1 /*
2 * Copyright 2014 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 "SkInterpolator.h"
9
10 #include "Test.h"
11
iset(SkScalar array[3],int a,int b,int c)12 static SkScalar* iset(SkScalar array[3], int a, int b, int c) {
13 array[0] = SkIntToScalar(a);
14 array[1] = SkIntToScalar(b);
15 array[2] = SkIntToScalar(c);
16 return array;
17 }
18
DEF_TEST(Interpolator,reporter)19 DEF_TEST(Interpolator, reporter) {
20 SkInterpolator inter(3, 2);
21 SkScalar v1[3], v2[3], v[3];
22 SkInterpolator::Result result;
23
24 inter.setKeyFrame(0, 100, iset(v1, 10, 20, 30), 0);
25 inter.setKeyFrame(1, 200, iset(v2, 110, 220, 330));
26
27 result = inter.timeToValues(0, v);
28 REPORTER_ASSERT(reporter, result == SkInterpolator::kFreezeStart_Result);
29 REPORTER_ASSERT(reporter, memcmp(v, v1, sizeof(v)) == 0);
30
31 result = inter.timeToValues(99, v);
32 REPORTER_ASSERT(reporter, result == SkInterpolator::kFreezeStart_Result);
33 REPORTER_ASSERT(reporter, memcmp(v, v1, sizeof(v)) == 0);
34
35 result = inter.timeToValues(100, v);
36 REPORTER_ASSERT(reporter, result == SkInterpolator::kNormal_Result);
37 REPORTER_ASSERT(reporter, memcmp(v, v1, sizeof(v)) == 0);
38
39 result = inter.timeToValues(200, v);
40 REPORTER_ASSERT(reporter, result == SkInterpolator::kNormal_Result);
41 REPORTER_ASSERT(reporter, memcmp(v, v2, sizeof(v)) == 0);
42
43 result = inter.timeToValues(201, v);
44 REPORTER_ASSERT(reporter, result == SkInterpolator::kFreezeEnd_Result);
45 REPORTER_ASSERT(reporter, memcmp(v, v2, sizeof(v)) == 0);
46
47 result = inter.timeToValues(150, v);
48 REPORTER_ASSERT(reporter, result == SkInterpolator::kNormal_Result);
49
50 // Found failing when we re-enabled this test:
51 #if 0
52 SkScalar vv[3];
53 REPORTER_ASSERT(reporter, memcmp(v, iset(vv, 60, 120, 180), sizeof(v)) == 0);
54 #endif
55
56 result = inter.timeToValues(125, v);
57 REPORTER_ASSERT(reporter, result == SkInterpolator::kNormal_Result);
58 result = inter.timeToValues(175, v);
59 REPORTER_ASSERT(reporter, result == SkInterpolator::kNormal_Result);
60
61 for (SkScalar val = -0.1f; val <= 1.1f; val += 0.1f) {
62 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(SkTPin(0.f, val, 1.f),
63 SkUnitCubicInterp(val, 1.f/3, 1.f/3, 2.f/3, 2.f/3)));
64 }
65
66 // These numbers come from
67 // http://www.w3.org/TR/css3-transitions/#transition-timing-function_tag.
68 const SkScalar testTransitions[][4] = {
69 { 0.25f, 0.1f, 0.25f, 1 }, // ease
70 { 0.42f, 0, 1, 1 }, // ease in
71 { 0, 0, 0.58f, 1 }, // ease out
72 { 0.42f, 0, 0.58f, 1 }, // ease in out
73 };
74
75 const SkScalar expectedOutput[][5] = {
76 { 0.0947876f, 0.513367f, 0.80249f, 0.940796f, 0.994263f }, // ease
77 { 0.0170288f, 0.129639f, 0.31543f, 0.554749f, 0.839417f }, // ease in
78 { 0.160583f, 0.445251f, 0.684692f, 0.870361f, 0.982971f }, // ease out
79 { 0.0197144f, 0.187439f, 0.500122f, 0.812561f, 0.980286f }, // ease in out
80 };
81
82 int i = 0;
83 for (const SkScalar* t : testTransitions) {
84 int j = 0;
85 for (SkScalar val = 0.1f; val < 1; val += 0.2f) {
86 REPORTER_ASSERT(reporter, SkScalarNearlyEqual(expectedOutput[i][j++],
87 SkUnitCubicInterp(val, t[0], t[1], t[2], t[3])));
88 }
89 ++i;
90 }
91 }
92