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- /*
- * 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/SkVertices.h"
- #include "include/utils/SkShadowUtils.h"
- #include "src/core/SkDrawShadowInfo.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->vertexCount()) {
- ERRORF(reporter, "Expected shadow tessellation to generate no vertices but it did.");
- } else if (kDo_ExpectVerts == expectVerts && !verts->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);
- check_result(reporter, verts, expectVerts, expectSuccess);
- verts = SkShadowTessellator::MakeSpot(path, ctm, heightParams, {0, 0, 128}, 128.f, false);
- 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) {
- const SkDrawShadowRec rec = {
- SkPoint3::Make(0, 0, 4),
- SkPoint3::Make(100, 0, 600),
- 800.f,
- 0x08000000,
- 0x40000000,
- 0
- };
- 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);
- if (verts) {
- REPORTER_ASSERT(reporter, bounds.contains(verts->bounds()));
- }
- }
- void check_bounds(skiatest::Reporter* reporter, const SkPath& path) {
- 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);
- 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);
- }
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