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
12static 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
19DEF_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        SkDebugf("\n");
91    }
92}
93