1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "Test.h"
#include "SkCanvas.h"
#include "SkPaint.h"
#include "SkCubicClipper.h"
#include "SkGeometry.h"
// Currently the supersampler blitter uses int16_t for its index into an array
// the width of the clip. Test that we don't crash/assert if we try to draw
// with a device/clip that is larger.
static void test_giantClip() {
SkBitmap bm;
bm.setConfig(SkBitmap::kARGB_8888_Config, 64919, 1);
bm.allocPixels();
SkCanvas canvas(bm);
canvas.clear(0);
SkPath path;
path.moveTo(0, 0); path.lineTo(1, 0); path.lineTo(33, 1);
SkPaint paint;
paint.setAntiAlias(true);
canvas.drawPath(path, paint);
}
static void PrintCurve(const char *name, const SkPoint crv[4]) {
printf("%s: %.10g, %.10g, %.10g, %.10g, %.10g, %.10g, %.10g, %.10g\n",
name,
(float)crv[0].fX, (float)crv[0].fY,
(float)crv[1].fX, (float)crv[1].fY,
(float)crv[2].fX, (float)crv[2].fY,
(float)crv[3].fX, (float)crv[3].fY);
}
static bool CurvesAreEqual(const SkPoint c0[4],
const SkPoint c1[4],
float tol) {
for (int i = 0; i < 4; i++) {
if (SkScalarAbs(c0[i].fX - c1[i].fX) > SkFloatToScalar(tol) ||
SkScalarAbs(c0[i].fY - c1[i].fY) > SkFloatToScalar(tol)
) {
PrintCurve("c0", c0);
PrintCurve("c1", c1);
return false;
}
}
return true;
}
static SkPoint* SetCurve(float x0, float y0,
float x1, float y1,
float x2, float y2,
float x3, float y3,
SkPoint crv[4]) {
crv[0].fX = SkFloatToScalar(x0); crv[0].fY = SkFloatToScalar(y0);
crv[1].fX = SkFloatToScalar(x1); crv[1].fY = SkFloatToScalar(y1);
crv[2].fX = SkFloatToScalar(x2); crv[2].fY = SkFloatToScalar(y2);
crv[3].fX = SkFloatToScalar(x3); crv[3].fY = SkFloatToScalar(y3);
return crv;
}
static void TestCubicClipping(skiatest::Reporter* reporter) {
static SkPoint crv[4] = {
{ SkIntToScalar(0), SkIntToScalar(0) },
{ SkIntToScalar(2), SkIntToScalar(3) },
{ SkIntToScalar(1), SkIntToScalar(10) },
{ SkIntToScalar(4), SkIntToScalar(12) }
};
SkCubicClipper clipper;
SkPoint clipped[4], shouldbe[4];
SkIRect clipRect;
bool success;
const float tol = SkFloatToScalar(1e-4f);
// Test no clip, with plenty of room.
clipRect.set(-2, -2, 6, 14);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
0, 0, 2, 3, 1, 10, 4, 12, shouldbe), tol));
// Test no clip, touching first point.
clipRect.set(-2, 0, 6, 14);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
0, 0, 2, 3, 1, 10, 4, 12, shouldbe), tol));
// Test no clip, touching last point.
clipRect.set(-2, -2, 6, 12);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
0, 0, 2, 3, 1, 10, 4, 12, shouldbe), tol));
// Test all clip.
clipRect.set(-2, 14, 6, 20);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == false);
// Test clip at 1.
clipRect.set(-2, 1, 6, 14);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
0.5126125216f, 1,
1.841195941f, 4.337081432f,
1.297019958f, 10.19801331f,
4, 12,
shouldbe), tol));
// Test clip at 2.
clipRect.set(-2, 2, 6, 14);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
00.8412352204f, 2,
1.767683744f, 5.400758266f,
1.55052948f, 10.36701965f,
4, 12,
shouldbe), tol));
// Test clip at 11.
clipRect.set(-2, -2, 6, 11);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
0, 0,
1.742904663f, 2.614356995f,
1.207521796f, 8.266430855f,
3.026495695f, 11,
shouldbe), tol));
// Test clip at 10.
clipRect.set(-2, -2, 6, 10);
clipper.setClip(clipRect);
success = clipper.clipCubic(crv, clipped);
REPORTER_ASSERT(reporter, success == true);
REPORTER_ASSERT(reporter, CurvesAreEqual(clipped, SetCurve(
0, 0,
1.551193237f, 2.326789856f,
1.297736168f, 7.059780121f,
2.505550385f, 10,
shouldbe), tol));
test_giantClip();
}
#include "TestClassDef.h"
DEFINE_TESTCLASS("CubicClipper", CubicClippingTestClass, TestCubicClipping)
|
