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      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 
     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 
     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