| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "flutter/testing/testing.h" |
| #include "gtest/gtest.h" |
| |
| #include "impeller/geometry/geometry_asserts.h" |
| #include "impeller/geometry/path.h" |
| #include "impeller/geometry/path_builder.h" |
| #include "impeller/tessellator/tessellator.h" |
| |
| namespace impeller { |
| namespace testing { |
| |
| TEST(TessellatorTest, TessellatorBuilderReturnsCorrectResultStatus) { |
| // Zero points. |
| { |
| Tessellator t; |
| auto path = PathBuilder{}.TakePath(FillType::kPositive); |
| Tessellator::Result result = t.Tessellate( |
| path, 1.0f, |
| [](const float* vertices, size_t vertices_count, |
| const uint16_t* indices, size_t indices_count) { return true; }); |
| |
| ASSERT_EQ(result, Tessellator::Result::kInputError); |
| } |
| |
| // One point. |
| { |
| Tessellator t; |
| auto path = PathBuilder{}.LineTo({0, 0}).TakePath(FillType::kPositive); |
| Tessellator::Result result = t.Tessellate( |
| path, 1.0f, |
| [](const float* vertices, size_t vertices_count, |
| const uint16_t* indices, size_t indices_count) { return true; }); |
| |
| ASSERT_EQ(result, Tessellator::Result::kSuccess); |
| } |
| |
| // Two points. |
| { |
| Tessellator t; |
| auto path = |
| PathBuilder{}.AddLine({0, 0}, {0, 1}).TakePath(FillType::kPositive); |
| Tessellator::Result result = t.Tessellate( |
| path, 1.0f, |
| [](const float* vertices, size_t vertices_count, |
| const uint16_t* indices, size_t indices_count) { return true; }); |
| |
| ASSERT_EQ(result, Tessellator::Result::kSuccess); |
| } |
| |
| // Many points. |
| { |
| Tessellator t; |
| PathBuilder builder; |
| for (int i = 0; i < 1000; i++) { |
| auto coord = i * 1.0f; |
| builder.AddLine({coord, coord}, {coord + 1, coord + 1}); |
| } |
| auto path = builder.TakePath(FillType::kPositive); |
| Tessellator::Result result = t.Tessellate( |
| path, 1.0f, |
| [](const float* vertices, size_t vertices_count, |
| const uint16_t* indices, size_t indices_count) { return true; }); |
| |
| ASSERT_EQ(result, Tessellator::Result::kSuccess); |
| } |
| |
| // Closure fails. |
| { |
| Tessellator t; |
| auto path = |
| PathBuilder{}.AddLine({0, 0}, {0, 1}).TakePath(FillType::kPositive); |
| Tessellator::Result result = t.Tessellate( |
| path, 1.0f, |
| [](const float* vertices, size_t vertices_count, |
| const uint16_t* indices, size_t indices_count) { return false; }); |
| |
| ASSERT_EQ(result, Tessellator::Result::kInputError); |
| } |
| |
| // More than uint16 points, odd fill mode. |
| { |
| Tessellator t; |
| PathBuilder builder = {}; |
| for (auto i = 0; i < 1000; i++) { |
| builder.AddCircle(Point(i, i), 4); |
| } |
| auto path = builder.TakePath(FillType::kOdd); |
| bool no_indices = false; |
| size_t count = 0u; |
| Tessellator::Result result = t.Tessellate( |
| path, 1.0f, |
| [&no_indices, &count](const float* vertices, size_t vertices_count, |
| const uint16_t* indices, size_t indices_count) { |
| no_indices = indices == nullptr; |
| count = vertices_count; |
| return true; |
| }); |
| |
| ASSERT_TRUE(no_indices); |
| ASSERT_TRUE(count >= USHRT_MAX); |
| ASSERT_EQ(result, Tessellator::Result::kSuccess); |
| } |
| } |
| |
| TEST(TessellatorTest, TessellateConvex) { |
| { |
| Tessellator t; |
| // Sanity check simple rectangle. |
| auto pts = t.TessellateConvex( |
| PathBuilder{}.AddRect(Rect::MakeLTRB(0, 0, 10, 10)).TakePath(), 1.0); |
| |
| std::vector<Point> expected = { |
| {0, 0}, {10, 0}, {0, 10}, {10, 10}, // |
| }; |
| EXPECT_EQ(pts, expected); |
| } |
| |
| { |
| Tessellator t; |
| auto pts = t.TessellateConvex(PathBuilder{} |
| .AddRect(Rect::MakeLTRB(0, 0, 10, 10)) |
| .AddRect(Rect::MakeLTRB(20, 20, 30, 30)) |
| .TakePath(), |
| 1.0); |
| |
| std::vector<Point> expected = {{0, 0}, {10, 0}, {0, 10}, {10, 10}, |
| {10, 10}, {20, 20}, {20, 20}, {30, 20}, |
| {20, 30}, {30, 30}}; |
| EXPECT_EQ(pts, expected); |
| } |
| } |
| |
| TEST(TessellatorTest, CircleVertexCounts) { |
| auto tessellator = std::make_shared<Tessellator>(); |
| |
| auto test = [&tessellator](const Matrix& transform, Scalar radius) { |
| auto generator = tessellator->FilledCircle(transform, {}, radius); |
| size_t quadrant_divisions = generator.GetVertexCount() / 4; |
| |
| // Confirm the approximation error is within the currently accepted |
| // |kCircleTolerance| value advertised by |CircleTessellator|. |
| // (With an additional 1% tolerance for floating point rounding.) |
| double angle = kPiOver2 / quadrant_divisions; |
| Point first = {radius, 0}; |
| Point next = {static_cast<Scalar>(cos(angle) * radius), |
| static_cast<Scalar>(sin(angle) * radius)}; |
| Point midpoint = (first + next) * 0.5; |
| EXPECT_GE(midpoint.GetLength(), |
| radius - Tessellator::kCircleTolerance * 1.01) |
| << ", transform = " << transform << ", radius = " << radius |
| << ", divisions = " << quadrant_divisions; |
| }; |
| |
| test({}, 0.0); |
| test({}, 0.9); |
| test({}, 1.0); |
| test({}, 1.9); |
| test(Matrix::MakeScale(Vector2(2.0, 2.0)), 0.95); |
| test({}, 2.0); |
| test(Matrix::MakeScale(Vector2(2.0, 2.0)), 1.0); |
| test({}, 11.9); |
| test({}, 12.0); |
| test({}, 35.9); |
| for (int i = 36; i < 10000; i += 4) { |
| test({}, i); |
| } |
| } |
| |
| TEST(TessellatorTest, FilledCircleTessellationVertices) { |
| auto tessellator = std::make_shared<Tessellator>(); |
| |
| auto test = [&tessellator](const Matrix& transform, const Point& center, |
| Scalar radius) { |
| auto generator = tessellator->FilledCircle(transform, center, radius); |
| EXPECT_EQ(generator.GetTriangleType(), PrimitiveType::kTriangleStrip); |
| |
| auto vertex_count = generator.GetVertexCount(); |
| auto vertices = std::vector<Point>(); |
| generator.GenerateVertices([&vertices](const Point& p) { // |
| vertices.push_back(p); |
| }); |
| EXPECT_EQ(vertices.size(), vertex_count); |
| ASSERT_EQ(vertex_count % 4, 0u); |
| |
| auto quadrant_count = vertex_count / 4; |
| for (size_t i = 0; i < quadrant_count; i++) { |
| double angle = kPiOver2 * i / (quadrant_count - 1); |
| double degrees = angle * 180.0 / kPi; |
| double rsin = sin(angle) * radius; |
| double rcos = cos(angle) * radius; |
| EXPECT_POINT_NEAR(vertices[i * 2], |
| Point(center.x - rcos, center.y + rsin)) |
| << "vertex " << i << ", angle = " << degrees << std::endl; |
| EXPECT_POINT_NEAR(vertices[i * 2 + 1], |
| Point(center.x - rcos, center.y - rsin)) |
| << "vertex " << i << ", angle = " << degrees << std::endl; |
| EXPECT_POINT_NEAR(vertices[vertex_count - i * 2 - 1], |
| Point(center.x + rcos, center.y - rsin)) |
| << "vertex " << i << ", angle = " << degrees << std::endl; |
| EXPECT_POINT_NEAR(vertices[vertex_count - i * 2 - 2], |
| Point(center.x + rcos, center.y + rsin)) |
| << "vertex " << i << ", angle = " << degrees << std::endl; |
| } |
| }; |
| |
| test({}, {}, 2.0); |
| test({}, {10, 10}, 2.0); |
| test(Matrix::MakeScale({500.0, 500.0, 0.0}), {}, 2.0); |
| test(Matrix::MakeScale({0.002, 0.002, 0.0}), {}, 1000.0); |
| } |
| |
| TEST(TessellatorTest, StrokedCircleTessellationVertices) { |
| auto tessellator = std::make_shared<Tessellator>(); |
| |
| auto test = [&tessellator](const Matrix& transform, const Point& center, |
| Scalar radius, Scalar half_width) { |
| ASSERT_GT(radius, half_width); |
| auto generator = |
| tessellator->StrokedCircle(transform, center, radius, half_width); |
| EXPECT_EQ(generator.GetTriangleType(), PrimitiveType::kTriangleStrip); |
| |
| auto vertex_count = generator.GetVertexCount(); |
| auto vertices = std::vector<Point>(); |
| generator.GenerateVertices([&vertices](const Point& p) { // |
| vertices.push_back(p); |
| }); |
| EXPECT_EQ(vertices.size(), vertex_count); |
| ASSERT_EQ(vertex_count % 4, 0u); |
| |
| auto quadrant_count = vertex_count / 8; |
| |
| // Test outer points first |
| for (size_t i = 0; i < quadrant_count; i++) { |
| double angle = kPiOver2 * i / (quadrant_count - 1); |
| double degrees = angle * 180.0 / kPi; |
| double rsin = sin(angle) * (radius + half_width); |
| double rcos = cos(angle) * (radius + half_width); |
| EXPECT_POINT_NEAR(vertices[i * 2], |
| Point(center.x - rcos, center.y - rsin)) |
| << "vertex " << i << ", angle = " << degrees << std::endl; |
| EXPECT_POINT_NEAR(vertices[quadrant_count * 2 + i * 2], |
| Point(center.x + rsin, center.y - rcos)) |
| << "vertex " << i << ", angle = " << degrees << std::endl; |
| EXPECT_POINT_NEAR(vertices[quadrant_count * 4 + i * 2], |
| Point(center.x + rcos, center.y + rsin)) |
| << "vertex " << i << ", angle = " << degrees << std::endl; |
| EXPECT_POINT_NEAR(vertices[quadrant_count * 6 + i * 2], |
| Point(center.x - rsin, center.y + rcos)) |
| << "vertex " << i << ", angle = " << degrees << std::endl; |
| } |
| |
| // Then test innerer points |
| for (size_t i = 0; i < quadrant_count; i++) { |
| double angle = kPiOver2 * i / (quadrant_count - 1); |
| double degrees = angle * 180.0 / kPi; |
| double rsin = sin(angle) * (radius - half_width); |
| double rcos = cos(angle) * (radius - half_width); |
| EXPECT_POINT_NEAR(vertices[i * 2 + 1], |
| Point(center.x - rcos, center.y - rsin)) |
| << "vertex " << i << ", angle = " << degrees << std::endl; |
| EXPECT_POINT_NEAR(vertices[quadrant_count * 2 + i * 2 + 1], |
| Point(center.x + rsin, center.y - rcos)) |
| << "vertex " << i << ", angle = " << degrees << std::endl; |
| EXPECT_POINT_NEAR(vertices[quadrant_count * 4 + i * 2 + 1], |
| Point(center.x + rcos, center.y + rsin)) |
| << "vertex " << i << ", angle = " << degrees << std::endl; |
| EXPECT_POINT_NEAR(vertices[quadrant_count * 6 + i * 2 + 1], |
| Point(center.x - rsin, center.y + rcos)) |
| << "vertex " << i << ", angle = " << degrees << std::endl; |
| } |
| }; |
| |
| test({}, {}, 2.0, 1.0); |
| test({}, {}, 2.0, 0.5); |
| test({}, {10, 10}, 2.0, 1.0); |
| test(Matrix::MakeScale({500.0, 500.0, 0.0}), {}, 2.0, 1.0); |
| test(Matrix::MakeScale({0.002, 0.002, 0.0}), {}, 1000.0, 10.0); |
| } |
| |
| TEST(TessellatorTest, RoundCapLineTessellationVertices) { |
| auto tessellator = std::make_shared<Tessellator>(); |
| |
| auto test = [&tessellator](const Matrix& transform, const Point& p0, |
| const Point& p1, Scalar radius) { |
| auto generator = tessellator->RoundCapLine(transform, p0, p1, radius); |
| EXPECT_EQ(generator.GetTriangleType(), PrimitiveType::kTriangleStrip); |
| |
| auto vertex_count = generator.GetVertexCount(); |
| auto vertices = std::vector<Point>(); |
| generator.GenerateVertices([&vertices](const Point& p) { // |
| vertices.push_back(p); |
| }); |
| EXPECT_EQ(vertices.size(), vertex_count); |
| ASSERT_EQ(vertex_count % 4, 0u); |
| |
| Point along = p1 - p0; |
| Scalar length = along.GetLength(); |
| if (length > 0) { |
| along *= radius / length; |
| } else { |
| along = {radius, 0}; |
| } |
| Point across = {-along.y, along.x}; |
| |
| auto quadrant_count = vertex_count / 4; |
| for (size_t i = 0; i < quadrant_count; i++) { |
| double angle = kPiOver2 * i / (quadrant_count - 1); |
| double degrees = angle * 180.0 / kPi; |
| Point relative_along = along * cos(angle); |
| Point relative_across = across * sin(angle); |
| EXPECT_POINT_NEAR(vertices[i * 2], // |
| p0 - relative_along + relative_across) |
| << "vertex " << i << ", angle = " << degrees << ", " // |
| << "line = " << p0 << " => " << p1 << ", " // |
| << "radius = " << radius << std::endl; |
| EXPECT_POINT_NEAR(vertices[i * 2 + 1], // |
| p0 - relative_along - relative_across) |
| << "vertex " << i << ", angle = " << degrees << ", " // |
| << "line = " << p0 << " => " << p1 << ", " // |
| << "radius = " << radius << std::endl; |
| EXPECT_POINT_NEAR(vertices[vertex_count - i * 2 - 1], // |
| p1 + relative_along - relative_across) |
| << "vertex " << i << ", angle = " << degrees << ", " // |
| << "line = " << p0 << " => " << p1 << ", " // |
| << "radius = " << radius << std::endl; |
| EXPECT_POINT_NEAR(vertices[vertex_count - i * 2 - 2], // |
| p1 + relative_along + relative_across) |
| << "vertex " << i << ", angle = " << degrees << ", " // |
| << "line = " << p0 << " => " << p1 << ", " // |
| << "radius = " << radius << std::endl; |
| } |
| }; |
| |
| // Empty line should actually use the circle generator, but its |
| // results should match the same math as the round cap generator. |
| test({}, {0, 0}, {0, 0}, 10); |
| |
| test({}, {0, 0}, {10, 0}, 2); |
| test({}, {10, 0}, {0, 0}, 2); |
| test({}, {0, 0}, {10, 10}, 2); |
| |
| test(Matrix::MakeScale({500.0, 500.0, 0.0}), {0, 0}, {10, 0}, 2); |
| test(Matrix::MakeScale({500.0, 500.0, 0.0}), {10, 0}, {0, 0}, 2); |
| test(Matrix::MakeScale({500.0, 500.0, 0.0}), {0, 0}, {10, 10}, 2); |
| |
| test(Matrix::MakeScale({0.002, 0.002, 0.0}), {0, 0}, {10, 0}, 2); |
| test(Matrix::MakeScale({0.002, 0.002, 0.0}), {10, 0}, {0, 0}, 2); |
| test(Matrix::MakeScale({0.002, 0.002, 0.0}), {0, 0}, {10, 10}, 2); |
| } |
| |
| TEST(TessellatorTest, FilledEllipseTessellationVertices) { |
| auto tessellator = std::make_shared<Tessellator>(); |
| |
| auto test = [&tessellator](const Matrix& transform, const Rect& bounds) { |
| auto center = bounds.GetCenter(); |
| auto half_size = bounds.GetSize() * 0.5f; |
| |
| auto generator = tessellator->FilledEllipse(transform, bounds); |
| EXPECT_EQ(generator.GetTriangleType(), PrimitiveType::kTriangleStrip); |
| |
| auto vertex_count = generator.GetVertexCount(); |
| auto vertices = std::vector<Point>(); |
| generator.GenerateVertices([&vertices](const Point& p) { // |
| vertices.push_back(p); |
| }); |
| EXPECT_EQ(vertices.size(), vertex_count); |
| ASSERT_EQ(vertex_count % 4, 0u); |
| |
| auto quadrant_count = vertex_count / 4; |
| for (size_t i = 0; i < quadrant_count; i++) { |
| double angle = kPiOver2 * i / (quadrant_count - 1); |
| double degrees = angle * 180.0 / kPi; |
| double rcos = cos(angle) * half_size.width; |
| double rsin = sin(angle) * half_size.height; |
| EXPECT_POINT_NEAR(vertices[i * 2], |
| Point(center.x - rcos, center.y + rsin)) |
| << "vertex " << i << ", angle = " << degrees << ", " // |
| << "bounds = " << bounds << std::endl; |
| EXPECT_POINT_NEAR(vertices[i * 2 + 1], |
| Point(center.x - rcos, center.y - rsin)) |
| << "vertex " << i << ", angle = " << degrees << ", " // |
| << "bounds = " << bounds << std::endl; |
| EXPECT_POINT_NEAR(vertices[vertex_count - i * 2 - 1], |
| Point(center.x + rcos, center.y - rsin)) |
| << "vertex " << i << ", angle = " << degrees << ", " // |
| << "bounds = " << bounds << std::endl; |
| EXPECT_POINT_NEAR(vertices[vertex_count - i * 2 - 2], |
| Point(center.x + rcos, center.y + rsin)) |
| << "vertex " << i << ", angle = " << degrees << ", " // |
| << "bounds = " << bounds << std::endl; |
| } |
| }; |
| |
| // Square bounds should actually use the circle generator, but its |
| // results should match the same math as the ellipse generator. |
| test({}, Rect::MakeXYWH(0, 0, 2, 2)); |
| |
| test({}, Rect::MakeXYWH(0, 0, 2, 3)); |
| test({}, Rect::MakeXYWH(0, 0, 3, 2)); |
| test({}, Rect::MakeXYWH(5, 10, 2, 3)); |
| test({}, Rect::MakeXYWH(16, 7, 3, 2)); |
| test(Matrix::MakeScale({500.0, 500.0, 0.0}), Rect::MakeXYWH(5, 10, 3, 2)); |
| test(Matrix::MakeScale({500.0, 500.0, 0.0}), Rect::MakeXYWH(5, 10, 2, 3)); |
| test(Matrix::MakeScale({0.002, 0.002, 0.0}), |
| Rect::MakeXYWH(5000, 10000, 3000, 2000)); |
| test(Matrix::MakeScale({0.002, 0.002, 0.0}), |
| Rect::MakeXYWH(5000, 10000, 2000, 3000)); |
| } |
| |
| TEST(TessellatorTest, FilledRoundRectTessellationVertices) { |
| auto tessellator = std::make_shared<Tessellator>(); |
| |
| auto test = [&tessellator](const Matrix& transform, const Rect& bounds, |
| const Size& radii) { |
| FML_DCHECK(radii.width * 2 <= bounds.GetWidth()) << radii << bounds; |
| FML_DCHECK(radii.height * 2 <= bounds.GetHeight()) << radii << bounds; |
| |
| Scalar middle_left = bounds.GetX() + radii.width; |
| Scalar middle_top = bounds.GetY() + radii.height; |
| Scalar middle_right = bounds.GetX() + bounds.GetWidth() - radii.width; |
| Scalar middle_bottom = bounds.GetY() + bounds.GetHeight() - radii.height; |
| |
| auto generator = tessellator->FilledRoundRect(transform, bounds, radii); |
| EXPECT_EQ(generator.GetTriangleType(), PrimitiveType::kTriangleStrip); |
| |
| auto vertex_count = generator.GetVertexCount(); |
| auto vertices = std::vector<Point>(); |
| generator.GenerateVertices([&vertices](const Point& p) { // |
| vertices.push_back(p); |
| }); |
| EXPECT_EQ(vertices.size(), vertex_count); |
| ASSERT_EQ(vertex_count % 4, 0u); |
| |
| auto quadrant_count = vertex_count / 4; |
| for (size_t i = 0; i < quadrant_count; i++) { |
| double angle = kPiOver2 * i / (quadrant_count - 1); |
| double degrees = angle * 180.0 / kPi; |
| double rcos = cos(angle) * radii.width; |
| double rsin = sin(angle) * radii.height; |
| EXPECT_POINT_NEAR(vertices[i * 2], |
| Point(middle_left - rcos, middle_bottom + rsin)) |
| << "vertex " << i << ", angle = " << degrees << ", " // |
| << "bounds = " << bounds << std::endl; |
| EXPECT_POINT_NEAR(vertices[i * 2 + 1], |
| Point(middle_left - rcos, middle_top - rsin)) |
| << "vertex " << i << ", angle = " << degrees << ", " // |
| << "bounds = " << bounds << std::endl; |
| EXPECT_POINT_NEAR(vertices[vertex_count - i * 2 - 1], |
| Point(middle_right + rcos, middle_top - rsin)) |
| << "vertex " << i << ", angle = " << degrees << ", " // |
| << "bounds = " << bounds << std::endl; |
| EXPECT_POINT_NEAR(vertices[vertex_count - i * 2 - 2], |
| Point(middle_right + rcos, middle_bottom + rsin)) |
| << "vertex " << i << ", angle = " << degrees << ", " // |
| << "bounds = " << bounds << std::endl; |
| } |
| }; |
| |
| // Both radii spanning the bounds should actually use the circle/ellipse |
| // generator, but their results should match the same math as the round |
| // rect generator. |
| test({}, Rect::MakeXYWH(0, 0, 20, 20), {10, 10}); |
| |
| // One radius spanning the bounds, but not the other will not match the |
| // round rect math if the generator transfers to circle/ellipse |
| test({}, Rect::MakeXYWH(0, 0, 20, 20), {10, 5}); |
| test({}, Rect::MakeXYWH(0, 0, 20, 20), {5, 10}); |
| |
| test({}, Rect::MakeXYWH(0, 0, 20, 30), {2, 2}); |
| test({}, Rect::MakeXYWH(0, 0, 30, 20), {2, 2}); |
| test({}, Rect::MakeXYWH(5, 10, 20, 30), {2, 3}); |
| test({}, Rect::MakeXYWH(16, 7, 30, 20), {2, 3}); |
| test(Matrix::MakeScale({500.0, 500.0, 0.0}), Rect::MakeXYWH(5, 10, 30, 20), |
| {2, 3}); |
| test(Matrix::MakeScale({500.0, 500.0, 0.0}), Rect::MakeXYWH(5, 10, 20, 30), |
| {2, 3}); |
| test(Matrix::MakeScale({0.002, 0.002, 0.0}), |
| Rect::MakeXYWH(5000, 10000, 3000, 2000), {50, 70}); |
| test(Matrix::MakeScale({0.002, 0.002, 0.0}), |
| Rect::MakeXYWH(5000, 10000, 2000, 3000), {50, 70}); |
| } |
| |
| } // namespace testing |
| } // namespace impeller |
