| /* |
| * Copyright 2017 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkPath.h" |
| #include "include/core/SkRRect.h" |
| #include "include/core/SkVertices.h" |
| #include "include/utils/SkShadowUtils.h" |
| #include "src/core/SkDrawShadowInfo.h" |
| #include "src/core/SkVerticesPriv.h" |
| #include "src/utils/SkShadowTessellator.h" |
| #include "tests/Test.h" |
| |
| enum ExpectVerts { |
| kDont_ExpectVerts, |
| kDo_ExpectVerts |
| }; |
| |
| void check_result(skiatest::Reporter* reporter, sk_sp<SkVertices> verts, |
| ExpectVerts expectVerts, bool expectSuccess) { |
| if (expectSuccess != SkToBool(verts)) { |
| ERRORF(reporter, "Expected shadow tessellation to %s but it did not.", |
| expectSuccess ? "succeed" : "fail"); |
| } |
| if (SkToBool(verts)) { |
| if (kDont_ExpectVerts == expectVerts && verts->priv().vertexCount()) { |
| ERRORF(reporter, "Expected shadow tessellation to generate no vertices but it did."); |
| } else if (kDo_ExpectVerts == expectVerts && !verts->priv().vertexCount()) { |
| ERRORF(reporter, "Expected shadow tessellation to generate vertices but it didn't."); |
| } |
| } |
| } |
| |
| void tessellate_shadow(skiatest::Reporter* reporter, const SkPath& path, const SkMatrix& ctm, |
| const SkPoint3& heightParams, ExpectVerts expectVerts, bool expectSuccess) { |
| |
| auto verts = SkShadowTessellator::MakeAmbient(path, ctm, heightParams, true); |
| check_result(reporter, verts, expectVerts, expectSuccess); |
| |
| verts = SkShadowTessellator::MakeAmbient(path, ctm, heightParams, false); |
| check_result(reporter, verts, expectVerts, expectSuccess); |
| |
| verts = SkShadowTessellator::MakeSpot(path, ctm, heightParams, {0, 0, 128}, 128.f, true, false); |
| check_result(reporter, verts, expectVerts, expectSuccess); |
| |
| verts = SkShadowTessellator::MakeSpot(path, ctm, heightParams, {0, 0, 128}, 128.f, false, |
| false); |
| check_result(reporter, verts, expectVerts, expectSuccess); |
| |
| verts = SkShadowTessellator::MakeSpot(path, ctm, heightParams, {0, 0, 128}, 128.f, true, true); |
| check_result(reporter, verts, expectVerts, expectSuccess); |
| |
| verts = SkShadowTessellator::MakeSpot(path, ctm, heightParams, {0, 0, 128}, 128.f, false, true); |
| check_result(reporter, verts, expectVerts, expectSuccess); |
| } |
| |
| DEF_TEST(ShadowUtils, reporter) { |
| SkCanvas canvas(100, 100); |
| |
| SkPath path; |
| path.cubicTo(100, 50, 20, 100, 0, 0); |
| tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 4}, kDo_ExpectVerts, true); |
| // super high path |
| tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 4.0e+37f}, |
| kDo_ExpectVerts, true); |
| |
| // This line segment has no area and no shadow. |
| path.reset(); |
| path.lineTo(10.f, 10.f); |
| tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 4}, kDont_ExpectVerts, true); |
| |
| // A series of collinear line segments |
| path.reset(); |
| for (int i = 0; i < 10; ++i) { |
| path.lineTo((SkScalar)i, (SkScalar)i); |
| } |
| tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 4}, kDont_ExpectVerts, true); |
| |
| // ugly degenerate path |
| path.reset(); |
| path.moveTo(-134217728, 2.22265153e+21f); |
| path.cubicTo(-2.33326106e+21f, 7.36298265e-41f, 3.72237738e-22f, 5.99502692e-36f, |
| 1.13631943e+22f, 2.0890786e+33f); |
| path.cubicTo(1.03397626e-25f, 5.99502692e-36f, 9.18354962e-41f, 0, 4.6142745e-37f, -213558848); |
| path.lineTo(-134217728, 2.2226515e+21f); |
| tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 9}, kDont_ExpectVerts, true); |
| |
| // simple concave path (star of David) |
| path.reset(); |
| path.moveTo(0.0f, -50.0f); |
| path.lineTo(14.43f, -25.0f); |
| path.lineTo(43.30f, -25.0f); |
| path.lineTo(28.86f, 0.0f); |
| path.lineTo(43.30f, 25.0f); |
| path.lineTo(14.43f, 25.0f); |
| path.lineTo(0.0f, 50.0f); |
| path.lineTo(-14.43f, 25.0f); |
| path.lineTo(-43.30f, 25.0f); |
| path.lineTo(-28.86f, 0.0f); |
| path.lineTo(-43.30f, -25.0f); |
| path.lineTo(-14.43f, -25.0f); |
| // uncomment when transparent concave shadows are working |
| // tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 9}, kDo_ExpectVerts, true); |
| |
| // complex concave path (bowtie) |
| path.reset(); |
| path.moveTo(-50, -50); |
| path.lineTo(-50, 50); |
| path.lineTo(50, -50); |
| path.lineTo(50, 50); |
| path.lineTo(-50, -50); |
| tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 9}, kDont_ExpectVerts, false); |
| |
| // multiple contour path |
| path.close(); |
| path.moveTo(0, 0); |
| path.lineTo(1, 0); |
| path.lineTo(0, 1); |
| tessellate_shadow(reporter, path, canvas.getTotalMatrix(), {0, 0, 9}, kDont_ExpectVerts, false); |
| } |
| |
| void check_xformed_bounds(skiatest::Reporter* reporter, const SkPath& path, const SkMatrix& ctm) { |
| SkDrawShadowRec rec = { |
| SkPoint3::Make(0, 0, 4), |
| SkPoint3::Make(100, 0, 600), |
| 800.f, |
| 0x08000000, |
| 0x40000000, |
| 0 |
| }; |
| // point light |
| SkRect bounds; |
| SkDrawShadowMetrics::GetLocalBounds(path, rec, ctm, &bounds); |
| ctm.mapRect(&bounds); |
| |
| auto verts = SkShadowTessellator::MakeAmbient(path, ctm, rec.fZPlaneParams, true); |
| if (verts) { |
| REPORTER_ASSERT(reporter, bounds.contains(verts->bounds())); |
| } |
| |
| SkPoint mapXY = ctm.mapXY(rec.fLightPos.fX, rec.fLightPos.fY); |
| SkPoint3 devLightPos = SkPoint3::Make(mapXY.fX, mapXY.fY, rec.fLightPos.fZ); |
| verts = SkShadowTessellator::MakeSpot(path, ctm, rec.fZPlaneParams, devLightPos, |
| rec.fLightRadius, false, false); |
| if (verts) { |
| REPORTER_ASSERT(reporter, bounds.contains(verts->bounds())); |
| } |
| |
| // directional light |
| rec.fFlags |= SkShadowFlags::kDirectionalLight_ShadowFlag; |
| rec.fLightRadius = 2.0f; |
| SkDrawShadowMetrics::GetLocalBounds(path, rec, ctm, &bounds); |
| ctm.mapRect(&bounds); |
| |
| verts = SkShadowTessellator::MakeAmbient(path, ctm, rec.fZPlaneParams, true); |
| if (verts) { |
| REPORTER_ASSERT(reporter, bounds.contains(verts->bounds())); |
| } |
| |
| devLightPos = rec.fLightPos; |
| devLightPos.normalize(); |
| verts = SkShadowTessellator::MakeSpot(path, ctm, rec.fZPlaneParams, devLightPos, |
| rec.fLightRadius, false, true); |
| if (verts) { |
| REPORTER_ASSERT(reporter, bounds.contains(verts->bounds())); |
| } |
| } |
| |
| void check_bounds(skiatest::Reporter* reporter, const SkPath& path) { |
| const bool fixed_shadows_in_perspective = false; // skbug.com/9698 |
| |
| SkMatrix ctm; |
| ctm.setTranslate(100, 100); |
| check_xformed_bounds(reporter, path, ctm); |
| ctm.postScale(2, 2); |
| check_xformed_bounds(reporter, path, ctm); |
| ctm.preRotate(45); |
| check_xformed_bounds(reporter, path, ctm); |
| ctm.preSkew(40, -20); |
| check_xformed_bounds(reporter, path, ctm); |
| if (fixed_shadows_in_perspective) { |
| ctm[SkMatrix::kMPersp0] = 0.0001f; |
| ctm[SkMatrix::kMPersp1] = 12.f; |
| check_xformed_bounds(reporter, path, ctm); |
| ctm[SkMatrix::kMPersp0] = 0.0001f; |
| ctm[SkMatrix::kMPersp1] = -12.f; |
| check_xformed_bounds(reporter, path, ctm); |
| ctm[SkMatrix::kMPersp0] = 12.f; |
| ctm[SkMatrix::kMPersp1] = 0.0001f; |
| check_xformed_bounds(reporter, path, ctm); |
| } |
| } |
| |
| DEF_TEST(ShadowBounds, reporter) { |
| SkPath path; |
| path.addRRect(SkRRect::MakeRectXY(SkRect::MakeLTRB(-50, -20, 40, 30), 4, 4)); |
| check_bounds(reporter, path); |
| |
| path.reset(); |
| path.addOval(SkRect::MakeLTRB(300, 300, 900, 900)); |
| check_bounds(reporter, path); |
| |
| path.reset(); |
| path.cubicTo(100, 50, 20, 100, 0, 0); |
| check_bounds(reporter, path); |
| } |