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[Impeller] Directly tessellate filled ellipses (flutter#48770)
Add support for filling ellipses/ovals and greatly simplify the primitive tessellation mechanisms.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| // 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. | ||
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| #include <algorithm> | ||
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| #include "flutter/impeller/entity/geometry/circle_geometry.h" | ||
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| #include "flutter/impeller/entity/geometry/line_geometry.h" | ||
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| namespace impeller { | ||
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| CircleGeometry::CircleGeometry(const Point& center, Scalar radius) | ||
| : center_(center), radius_(radius), stroke_width_(-1.0f) { | ||
| FML_DCHECK(radius >= 0); | ||
| } | ||
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| CircleGeometry::CircleGeometry(const Point& center, | ||
| Scalar radius, | ||
| Scalar stroke_width) | ||
| : center_(center), | ||
| radius_(radius), | ||
| stroke_width_(std::max(stroke_width, 0.0f)) { | ||
| FML_DCHECK(radius >= 0); | ||
| FML_DCHECK(stroke_width >= 0); | ||
| } | ||
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| GeometryResult CircleGeometry::GetPositionBuffer(const ContentContext& renderer, | ||
| const Entity& entity, | ||
| RenderPass& pass) const { | ||
| auto& transform = entity.GetTransform(); | ||
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| Scalar half_width = stroke_width_ < 0 ? 0.0 | ||
| : LineGeometry::ComputePixelHalfWidth( | ||
| transform, stroke_width_); | ||
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| std::shared_ptr<Tessellator> tessellator = renderer.GetTessellator(); | ||
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| // We call the StrokedCircle method which will simplify to a | ||
| // FilledCircleGenerator if the inner_radius is <= 0. | ||
| auto generator = | ||
| tessellator->StrokedCircle(transform, center_, radius_, half_width); | ||
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| return ComputePositionGeometry(generator, entity, pass); | ||
| } | ||
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| // |Geometry| | ||
| GeometryResult CircleGeometry::GetPositionUVBuffer( | ||
| Rect texture_coverage, | ||
| Matrix effect_transform, | ||
| const ContentContext& renderer, | ||
| const Entity& entity, | ||
| RenderPass& pass) const { | ||
| auto& transform = entity.GetTransform(); | ||
| auto uv_transform = | ||
| texture_coverage.GetNormalizingTransform() * effect_transform; | ||
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| Scalar half_width = stroke_width_ < 0 ? 0.0 | ||
| : LineGeometry::ComputePixelHalfWidth( | ||
| transform, stroke_width_); | ||
| std::shared_ptr<Tessellator> tessellator = renderer.GetTessellator(); | ||
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| // We call the StrokedCircle method which will simplify to a | ||
| // FilledCircleGenerator if the inner_radius is <= 0. | ||
| auto generator = | ||
| tessellator->StrokedCircle(transform, center_, radius_, half_width); | ||
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| return ComputePositionUVGeometry(generator, uv_transform, entity, pass); | ||
| } | ||
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| GeometryVertexType CircleGeometry::GetVertexType() const { | ||
| return GeometryVertexType::kPosition; | ||
| } | ||
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| std::optional<Rect> CircleGeometry::GetCoverage(const Matrix& transform) const { | ||
| Point corners[4]{ | ||
| {center_.x, center_.y - radius_}, | ||
| {center_.x + radius_, center_.y}, | ||
| {center_.x, center_.y + radius_}, | ||
| {center_.x - radius_, center_.y}, | ||
| }; | ||
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| for (int i = 0; i < 4; i++) { | ||
| corners[i] = transform * corners[i]; | ||
| } | ||
| return Rect::MakePointBounds(std::begin(corners), std::end(corners)); | ||
| } | ||
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| bool CircleGeometry::CoversArea(const Matrix& transform, | ||
| const Rect& rect) const { | ||
| return false; | ||
| } | ||
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| bool CircleGeometry::IsAxisAlignedRect() const { | ||
| return false; | ||
| } | ||
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| } // namespace impeller |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| // 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. | ||
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| #pragma once | ||
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| #include "impeller/entity/geometry/geometry.h" | ||
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| namespace impeller { | ||
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| // Geometry class that can generate vertices (with or without texture | ||
| // coordinates) for either filled or stroked circles | ||
| class CircleGeometry final : public Geometry { | ||
| public: | ||
| explicit CircleGeometry(const Point& center, Scalar radius); | ||
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| explicit CircleGeometry(const Point& center, | ||
| Scalar radius, | ||
| Scalar stroke_width); | ||
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| ~CircleGeometry() = default; | ||
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| // |Geometry| | ||
| bool CoversArea(const Matrix& transform, const Rect& rect) const override; | ||
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| // |Geometry| | ||
| bool IsAxisAlignedRect() const override; | ||
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| private: | ||
| // |Geometry| | ||
| GeometryResult GetPositionBuffer(const ContentContext& renderer, | ||
| const Entity& entity, | ||
| RenderPass& pass) const override; | ||
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| // |Geometry| | ||
| GeometryVertexType GetVertexType() const override; | ||
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| // |Geometry| | ||
| std::optional<Rect> GetCoverage(const Matrix& transform) const override; | ||
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| // |Geometry| | ||
| GeometryResult GetPositionUVBuffer(Rect texture_coverage, | ||
| Matrix effect_transform, | ||
| const ContentContext& renderer, | ||
| const Entity& entity, | ||
| RenderPass& pass) const override; | ||
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| Point center_; | ||
| Scalar radius_; | ||
| Scalar stroke_width_; | ||
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| CircleGeometry(const CircleGeometry&) = delete; | ||
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| CircleGeometry& operator=(const CircleGeometry&) = delete; | ||
| }; | ||
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| } // namespace impeller |
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