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 "SkCanvas.h"
9 #include "SkDrawShadowInfo.h"
10 #include "SkPath.h"
11 #include "SkShadowTessellator.h"
12 #include "SkShadowUtils.h"
13 #include "SkVertices.h"
14 #include "Test.h"
15
16 enum ExpectVerts {
17 kDont_ExpectVerts,
18 kDo_ExpectVerts
19 };
20
check_result(skiatest::Reporter * reporter,sk_sp<SkVertices> verts,ExpectVerts expectVerts,bool expectSuccess)21 void check_result(skiatest::Reporter* reporter, sk_sp<SkVertices> verts,
22 ExpectVerts expectVerts, bool expectSuccess) {
23 if (expectSuccess != SkToBool(verts)) {
24 ERRORF(reporter, "Expected shadow tessellation to %s but it did not.",
25 expectSuccess ? "succeed" : "fail");
26 }
27 if (SkToBool(verts)) {
28 if (kDont_ExpectVerts == expectVerts && verts->vertexCount()) {
29 ERRORF(reporter, "Expected shadow tessellation to generate no vertices but it did.");
30 } else if (kDo_ExpectVerts == expectVerts && !verts->vertexCount()) {
31 ERRORF(reporter, "Expected shadow tessellation to generate vertices but it didn't.");
32 }
33 }
34 }
35
tessellate_shadow(skiatest::Reporter * reporter,const SkPath & path,const SkMatrix & ctm,const SkPoint3 & heightParams,ExpectVerts expectVerts,bool expectSuccess)36 void tessellate_shadow(skiatest::Reporter* reporter, const SkPath& path, const SkMatrix& ctm,
37 const SkPoint3& heightParams, ExpectVerts expectVerts, bool expectSuccess) {
38
39 auto verts = SkShadowTessellator::MakeAmbient(path, ctm, heightParams, true);
40 check_result(reporter, verts, expectVerts, expectSuccess);
41
42 verts = SkShadowTessellator::MakeAmbient(path, ctm, heightParams, false);
43 check_result(reporter, verts, expectVerts, expectSuccess);
44
45 verts = SkShadowTessellator::MakeSpot(path, ctm, heightParams, {0, 0, 128}, 128.f, false);
46 check_result(reporter, verts, expectVerts, expectSuccess);
47
48 verts = SkShadowTessellator::MakeSpot(path, ctm, heightParams, {0, 0, 128}, 128.f, false);
49 check_result(reporter, verts, expectVerts, expectSuccess);
50 }
51
DEF_TEST(ShadowUtils,reporter)52 DEF_TEST(ShadowUtils, reporter) {
53 SkCanvas canvas(100, 100);
54
55 SkPath path;
56 path.cubicTo(100, 50, 20, 100, 0, 0);
57 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 4}, kDo_ExpectVerts, true);
58 // super high path
59 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 4.0e+37f},
60 kDo_ExpectVerts, true);
61
62 // This line segment has no area and no shadow.
63 path.reset();
64 path.lineTo(10.f, 10.f);
65 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 4}, kDont_ExpectVerts, true);
66
67 // A series of collinear line segments
68 path.reset();
69 for (int i = 0; i < 10; ++i) {
70 path.lineTo((SkScalar)i, (SkScalar)i);
71 }
72 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 4}, kDont_ExpectVerts, true);
73
74 // ugly degenerate path
75 path.reset();
76 path.moveTo(-134217728, 2.22265153e+21f);
77 path.cubicTo(-2.33326106e+21f, 7.36298265e-41f, 3.72237738e-22f, 5.99502692e-36f,
78 1.13631943e+22f, 2.0890786e+33f);
79 path.cubicTo(1.03397626e-25f, 5.99502692e-36f, 9.18354962e-41f, 0, 4.6142745e-37f, -213558848);
80 path.lineTo(-134217728, 2.2226515e+21f);
81 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 9}, kDont_ExpectVerts, true);
82
83 // simple concave path (star of David)
84 path.reset();
85 path.moveTo(0.0f, -50.0f);
86 path.lineTo(14.43f, -25.0f);
87 path.lineTo(43.30f, -25.0f);
88 path.lineTo(28.86f, 0.0f);
89 path.lineTo(43.30f, 25.0f);
90 path.lineTo(14.43f, 25.0f);
91 path.lineTo(0.0f, 50.0f);
92 path.lineTo(-14.43f, 25.0f);
93 path.lineTo(-43.30f, 25.0f);
94 path.lineTo(-28.86f, 0.0f);
95 path.lineTo(-43.30f, -25.0f);
96 path.lineTo(-14.43f, -25.0f);
97 // uncomment when transparent concave shadows are working
98 // tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 9}, kDo_ExpectVerts, true);
99
100 // complex concave path (bowtie)
101 path.reset();
102 path.moveTo(-50, -50);
103 path.lineTo(-50, 50);
104 path.lineTo(50, -50);
105 path.lineTo(50, 50);
106 path.lineTo(-50, -50);
107 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 9}, kDont_ExpectVerts, false);
108
109 // multiple contour path
110 path.close();
111 path.moveTo(0, 0);
112 path.lineTo(1, 0);
113 path.lineTo(0, 1);
114 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 9}, kDont_ExpectVerts, false);
115 }
116
check_xformed_bounds(skiatest::Reporter * reporter,const SkPath & path,const SkMatrix & ctm)117 void check_xformed_bounds(skiatest::Reporter* reporter, const SkPath& path, const SkMatrix& ctm) {
118 const SkDrawShadowRec rec = {
119 SkPoint3::Make(0, 0, 4),
120 SkPoint3::Make(100, 0, 600),
121 800.f,
122 0x08000000,
123 0x40000000,
124 0
125 };
126 SkRect bounds;
127 SkDrawShadowMetrics::GetLocalBounds(path, rec, ctm, &bounds);
128 ctm.mapRect(&bounds);
129
130 auto verts = SkShadowTessellator::MakeAmbient(path, ctm, rec.fZPlaneParams, true);
131 if (verts) {
132 REPORTER_ASSERT(reporter, bounds.contains(verts->bounds()));
133 }
134
135 SkPoint mapXY = ctm.mapXY(rec.fLightPos.fX, rec.fLightPos.fY);
136 SkPoint3 devLightPos = SkPoint3::Make(mapXY.fX, mapXY.fY, rec.fLightPos.fZ);
137 verts = SkShadowTessellator::MakeSpot(path, ctm, rec.fZPlaneParams, devLightPos,
138 rec.fLightRadius, false);
139 if (verts) {
140 REPORTER_ASSERT(reporter, bounds.contains(verts->bounds()));
141 }
142 }
143
check_bounds(skiatest::Reporter * reporter,const SkPath & path)144 void check_bounds(skiatest::Reporter* reporter, const SkPath& path) {
145 SkMatrix ctm;
146 ctm.setTranslate(100, 100);
147 check_xformed_bounds(reporter, path, ctm);
148 ctm.postScale(2, 2);
149 check_xformed_bounds(reporter, path, ctm);
150 ctm.preRotate(45);
151 check_xformed_bounds(reporter, path, ctm);
152 ctm.preSkew(40, -20);
153 check_xformed_bounds(reporter, path, ctm);
154 ctm[SkMatrix::kMPersp0] = 0.0001f;
155 ctm[SkMatrix::kMPersp1] = 12.f;
156 check_xformed_bounds(reporter, path, ctm);
157 ctm[SkMatrix::kMPersp0] = 0.0001f;
158 ctm[SkMatrix::kMPersp1] = -12.f;
159 check_xformed_bounds(reporter, path, ctm);
160 ctm[SkMatrix::kMPersp0] = 12.f;
161 ctm[SkMatrix::kMPersp1] = 0.0001f;
162 check_xformed_bounds(reporter, path, ctm);
163 }
164
DEF_TEST(ShadowBounds,reporter)165 DEF_TEST(ShadowBounds, reporter) {
166 SkPath path;
167 path.addRRect(SkRRect::MakeRectXY(SkRect::MakeLTRB(-50, -20, 40, 30), 4, 4));
168 check_bounds(reporter, path);
169
170 path.reset();
171 path.addOval(SkRect::MakeLTRB(300, 300, 900, 900));
172 check_bounds(reporter, path);
173
174 path.reset();
175 path.cubicTo(100, 50, 20, 100, 0, 0);
176 check_bounds(reporter, path);
177 }
178