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 "include/core/SkCanvas.h"
9 #include "include/core/SkMatrix.h"
10 #include "include/core/SkPath.h"
11 #include "include/core/SkPoint.h"
12 #include "include/core/SkPoint3.h"
13 #include "include/core/SkRRect.h"
14 #include "include/core/SkRect.h"
15 #include "include/core/SkRefCnt.h"
16 #include "include/core/SkScalar.h"
17 #include "include/core/SkTypes.h"
18 #include "include/core/SkVertices.h"
19 #include "include/private/base/SkTo.h"
20 #include "include/utils/SkShadowUtils.h"
21 #include "src/core/SkDrawShadowInfo.h"
22 #include "src/core/SkVerticesPriv.h"
23 #include "src/utils/SkShadowTessellator.h"
24 #include "tests/Test.h"
25
26 #if !defined(SK_ENABLE_OPTIMIZE_SIZE)
27
28 enum ExpectVerts {
29 kDont_ExpectVerts,
30 kDo_ExpectVerts
31 };
32
check_result(skiatest::Reporter * reporter,sk_sp<SkVertices> verts,ExpectVerts expectVerts)33 void check_result(skiatest::Reporter* reporter, sk_sp<SkVertices> verts, ExpectVerts expectVerts) {
34 const bool expectSuccess = expectVerts == kDo_ExpectVerts;
35 if (expectSuccess != SkToBool(verts)) {
36 ERRORF(reporter, "Expected shadow tessellation to %s but it did not.",
37 expectSuccess ? "succeed" : "fail");
38 }
39 if (SkToBool(verts)) {
40 if (kDont_ExpectVerts == expectVerts && verts->priv().vertexCount()) {
41 ERRORF(reporter, "Expected shadow tessellation to generate no vertices but it did.");
42 } else if (kDo_ExpectVerts == expectVerts && !verts->priv().vertexCount()) {
43 ERRORF(reporter, "Expected shadow tessellation to generate vertices but it didn't.");
44 }
45 }
46 }
47
tessellate_shadow(skiatest::Reporter * reporter,const SkPath & path,const SkMatrix & ctm,const SkPoint3 & heightParams,ExpectVerts expectVerts)48 void tessellate_shadow(skiatest::Reporter* reporter, const SkPath& path, const SkMatrix& ctm,
49 const SkPoint3& heightParams, ExpectVerts expectVerts) {
50
51 auto verts = SkShadowTessellator::MakeAmbient(path, ctm, heightParams, true);
52 check_result(reporter, verts, expectVerts);
53
54 verts = SkShadowTessellator::MakeAmbient(path, ctm, heightParams, false);
55 check_result(reporter, verts, expectVerts);
56
57 verts = SkShadowTessellator::MakeSpot(path, ctm, heightParams, {0, 0, 128}, 128.f, true, false);
58 check_result(reporter, verts, expectVerts);
59
60 verts = SkShadowTessellator::MakeSpot(path, ctm, heightParams, {0, 0, 128}, 128.f, false,
61 false);
62 check_result(reporter, verts, expectVerts);
63
64 verts = SkShadowTessellator::MakeSpot(path, ctm, heightParams, {0, 0, 128}, 128.f, true, true);
65 check_result(reporter, verts, expectVerts);
66
67 verts = SkShadowTessellator::MakeSpot(path, ctm, heightParams, {0, 0, 128}, 128.f, false, true);
68 check_result(reporter, verts, expectVerts);
69 }
70
DEF_TEST(ShadowUtils,reporter)71 DEF_TEST(ShadowUtils, reporter) {
72 SkCanvas canvas(100, 100);
73
74 SkPath path;
75 path.cubicTo(100, 50, 20, 100, 0, 0);
76 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 4}, kDo_ExpectVerts);
77 // super high path
78 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 4.0e+37f}, kDo_ExpectVerts);
79
80 // This line segment has no area and no shadow.
81 path.reset();
82 path.lineTo(10.f, 10.f);
83 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 4}, kDont_ExpectVerts);
84
85 // A series of collinear line segments
86 path.reset();
87 for (int i = 0; i < 10; ++i) {
88 path.lineTo((SkScalar)i, (SkScalar)i);
89 }
90 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 4}, kDont_ExpectVerts);
91
92 // ugly degenerate path
93 path.reset();
94 path.moveTo(-134217728, 2.22265153e+21f);
95 path.cubicTo(-2.33326106e+21f, 7.36298265e-41f, 3.72237738e-22f, 5.99502692e-36f,
96 1.13631943e+22f, 2.0890786e+33f);
97 path.cubicTo(1.03397626e-25f, 5.99502692e-36f, 9.18354962e-41f, 0, 4.6142745e-37f, -213558848);
98 path.lineTo(-134217728, 2.2226515e+21f);
99 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 9}, kDont_ExpectVerts);
100
101 // simple concave path (star of David)
102 path.reset();
103 path.moveTo(0.0f, -50.0f);
104 path.lineTo(14.43f, -25.0f);
105 path.lineTo(43.30f, -25.0f);
106 path.lineTo(28.86f, 0.0f);
107 path.lineTo(43.30f, 25.0f);
108 path.lineTo(14.43f, 25.0f);
109 path.lineTo(0.0f, 50.0f);
110 path.lineTo(-14.43f, 25.0f);
111 path.lineTo(-43.30f, 25.0f);
112 path.lineTo(-28.86f, 0.0f);
113 path.lineTo(-43.30f, -25.0f);
114 path.lineTo(-14.43f, -25.0f);
115 // uncomment when transparent concave shadows are working
116 // tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 9}, kDo_ExpectVerts, true);
117
118 // complex concave path (bowtie)
119 path.reset();
120 path.moveTo(-50, -50);
121 path.lineTo(-50, 50);
122 path.lineTo(50, -50);
123 path.lineTo(50, 50);
124 path.lineTo(-50, -50);
125 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 9}, kDont_ExpectVerts);
126
127 // multiple contour path
128 path.close();
129 path.moveTo(0, 0);
130 path.lineTo(1, 0);
131 path.lineTo(0, 1);
132 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 9}, kDont_ExpectVerts);
133 }
134
check_xformed_bounds(skiatest::Reporter * reporter,const SkPath & path,const SkMatrix & ctm)135 void check_xformed_bounds(skiatest::Reporter* reporter, const SkPath& path, const SkMatrix& ctm) {
136 SkDrawShadowRec rec = {
137 SkPoint3::Make(0, 0, 4),
138 SkPoint3::Make(100, 0, 600),
139 800.f,
140 0x08000000,
141 0x40000000,
142 0
143 };
144 // point light
145 SkRect bounds;
146 SkDrawShadowMetrics::GetLocalBounds(path, rec, ctm, &bounds);
147 ctm.mapRect(&bounds);
148
149 auto verts = SkShadowTessellator::MakeAmbient(path, ctm, rec.fZPlaneParams, true);
150 if (verts) {
151 REPORTER_ASSERT(reporter, bounds.contains(verts->bounds()));
152 }
153
154 SkPoint mapXY = ctm.mapXY(rec.fLightPos.fX, rec.fLightPos.fY);
155 SkPoint3 devLightPos = SkPoint3::Make(mapXY.fX, mapXY.fY, rec.fLightPos.fZ);
156 verts = SkShadowTessellator::MakeSpot(path, ctm, rec.fZPlaneParams, devLightPos,
157 rec.fLightRadius, false, false);
158 if (verts) {
159 REPORTER_ASSERT(reporter, bounds.contains(verts->bounds()));
160 }
161
162 // directional light
163 rec.fFlags |= SkShadowFlags::kDirectionalLight_ShadowFlag;
164 rec.fLightRadius = 2.0f;
165 SkDrawShadowMetrics::GetLocalBounds(path, rec, ctm, &bounds);
166 ctm.mapRect(&bounds);
167
168 verts = SkShadowTessellator::MakeAmbient(path, ctm, rec.fZPlaneParams, true);
169 if (verts) {
170 REPORTER_ASSERT(reporter, bounds.contains(verts->bounds()));
171 }
172
173 devLightPos = rec.fLightPos;
174 devLightPos.normalize();
175 verts = SkShadowTessellator::MakeSpot(path, ctm, rec.fZPlaneParams, devLightPos,
176 rec.fLightRadius, false, true);
177 if (verts) {
178 REPORTER_ASSERT(reporter, bounds.contains(verts->bounds()));
179 }
180 }
181
check_bounds(skiatest::Reporter * reporter,const SkPath & path)182 void check_bounds(skiatest::Reporter* reporter, const SkPath& path) {
183 const bool fixed_shadows_in_perspective = false; // skbug.com/9698
184
185 SkMatrix ctm;
186 ctm.setTranslate(100, 100);
187 check_xformed_bounds(reporter, path, ctm);
188 ctm.postScale(2, 2);
189 check_xformed_bounds(reporter, path, ctm);
190 ctm.preRotate(45);
191 check_xformed_bounds(reporter, path, ctm);
192 ctm.preSkew(40, -20);
193 check_xformed_bounds(reporter, path, ctm);
194 if (fixed_shadows_in_perspective) {
195 ctm[SkMatrix::kMPersp0] = 0.0001f;
196 ctm[SkMatrix::kMPersp1] = 12.f;
197 check_xformed_bounds(reporter, path, ctm);
198 ctm[SkMatrix::kMPersp0] = 0.0001f;
199 ctm[SkMatrix::kMPersp1] = -12.f;
200 check_xformed_bounds(reporter, path, ctm);
201 ctm[SkMatrix::kMPersp0] = 12.f;
202 ctm[SkMatrix::kMPersp1] = 0.0001f;
203 check_xformed_bounds(reporter, path, ctm);
204 }
205 }
206
DEF_TEST(ShadowBounds,reporter)207 DEF_TEST(ShadowBounds, reporter) {
208 SkPath path;
209 path.addRRect(SkRRect::MakeRectXY(SkRect::MakeLTRB(-50, -20, 40, 30), 4, 4));
210 check_bounds(reporter, path);
211
212 path.reset();
213 path.addOval(SkRect::MakeLTRB(300, 300, 900, 900));
214 check_bounds(reporter, path);
215
216 path.reset();
217 path.cubicTo(100, 50, 20, 100, 0, 0);
218 check_bounds(reporter, path);
219 }
220
221 #endif // !defined(SK_ENABLE_OPTIMIZE_SIZE)
222