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 "SkPath.h"
10 #include "SkShadowTessellator.h"
11 #include "SkShadowUtils.h"
12 #include "SkVertices.h"
13 #include "Test.h"
14
tessellate_shadow(skiatest::Reporter * reporter,const SkPath & path,const SkMatrix & ctm,bool expectSuccess)15 void tessellate_shadow(skiatest::Reporter* reporter, const SkPath& path, const SkMatrix& ctm,
16 bool expectSuccess) {
17 static constexpr SkScalar kAmbientAlpha = 0.25f;
18 static constexpr SkScalar kSpotAlpha = 0.25f;
19
20 auto heightFunc = [] (SkScalar, SkScalar) { return 4; };
21
22 auto verts = SkShadowTessellator::MakeAmbient(path, ctm, heightFunc, kAmbientAlpha, true);
23 if (expectSuccess != SkToBool(verts)) {
24 ERRORF(reporter, "Expected shadow tessellation to %s but it did not.",
25 expectSuccess ? "succeed" : "fail");
26 }
27 verts = SkShadowTessellator::MakeAmbient(path, ctm, heightFunc, kAmbientAlpha, false);
28 if (expectSuccess != SkToBool(verts)) {
29 ERRORF(reporter, "Expected shadow tessellation to %s but it did not.",
30 expectSuccess ? "succeed" : "fail");
31 }
32 verts = SkShadowTessellator::MakeSpot(path, ctm, heightFunc, {0, 0, 128}, 128.f,
33 kSpotAlpha, false);
34 if (expectSuccess != SkToBool(verts)) {
35 ERRORF(reporter, "Expected shadow tessellation to %s but it did not.",
36 expectSuccess ? "succeed" : "fail");
37 }
38 verts = SkShadowTessellator::MakeSpot(path, ctm, heightFunc, {0, 0, 128}, 128.f,
39 kSpotAlpha, false);
40 if (expectSuccess != SkToBool(verts)) {
41 ERRORF(reporter, "Expected shadow tessellation to %s but it did not.",
42 expectSuccess ? "succeed" : "fail");
43 }
44 }
45
DEF_TEST(ShadowUtils,reporter)46 DEF_TEST(ShadowUtils, reporter) {
47 SkCanvas canvas(100, 100);
48 // Currently SkShadowUtils doesn't really support cubics when compiled without SK_SUPPORT_GPU.
49 // However, this should now not crash.
50 SkPath path;
51 path.cubicTo(100, 50, 20, 100, 0, 0);
52 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), (bool)SK_SUPPORT_GPU);
53
54 // This line segment has no area and no shadow.
55 path.reset();
56 path.lineTo(10.f, 10.f);
57 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), false);
58
59 // A series of colinear line segments
60 path.reset();
61 for (int i = 0; i < 10; ++i) {
62 path.lineTo((SkScalar)i, (SkScalar)i);
63 }
64 tessellate_shadow(reporter, path, canvas.getTotalMatrix(), false);
65 }
66