| Flutter Impeller |

cover_geometry.cc
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1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "impeller/entity/geometry/cover_geometry.h"
6
7 #include "impeller/renderer/render_pass.h"
8
9 namespace impeller {
10
11 CoverGeometry::CoverGeometry() = default;
12
13 GeometryResult CoverGeometry::GetPositionBuffer(const ContentContext& renderer,
14 const Entity& entity,
15 RenderPass& pass) const {
16 auto rect = Rect::MakeSize(pass.GetRenderTargetSize());
17 constexpr uint16_t kRectIndicies[4] = {0, 1, 2, 3};
18 auto& host_buffer = renderer.GetTransientsBuffer();
19 return GeometryResult{
20 .type = PrimitiveType::kTriangleStrip,
21 .vertex_buffer =
22 {
23 .vertex_buffer = host_buffer.Emplace(
24 rect.GetTransformedPoints(entity.GetTransform().Invert())
25 .data(),
26 8 * sizeof(float), alignof(float)),
27 .index_buffer = host_buffer.Emplace(
28 kRectIndicies, 4 * sizeof(uint16_t), alignof(uint16_t)),
29 .vertex_count = 4,
30 .index_type = IndexType::k16bit,
31 },
32 .transform = entity.GetShaderTransform(pass),
33 };
34 }
35
36 // |Geometry|
37 GeometryResult CoverGeometry::GetPositionUVBuffer(
38 Rect texture_coverage,
39 Matrix effect_transform,
40 const ContentContext& renderer,
41 const Entity& entity,
42 RenderPass& pass) const {
43 auto rect = Rect::MakeSize(pass.GetRenderTargetSize());
44 return ComputeUVGeometryForRect(rect, texture_coverage, effect_transform,
45 renderer, entity, pass);
46 }
47
48 GeometryVertexType CoverGeometry::GetVertexType() const {
49 return GeometryVertexType::kPosition;
50 }
51
52 std::optional<Rect> CoverGeometry::GetCoverage(const Matrix& transform) const {
53 return Rect::MakeMaximum();
54 }
55
56 bool CoverGeometry::CoversArea(const Matrix& transform,
57 const Rect& rect) const {
58 return true;
59 }
60
61 bool CoverGeometry::CanApplyMaskFilter() const {
62 return false;
63 }
64
65 } // namespace impeller
impeller::CoverGeometry::CanApplyMaskFilter
bool CanApplyMaskFilter() const override
Definition: cover_geometry.cc:61
impeller::IndexType::k16bit
@ k16bit
cover_geometry.h
impeller::GeometryVertexType
GeometryVertexType
Definition: geometry.h:49
impeller::CoverGeometry::CoversArea
bool CoversArea(const Matrix &transform, const Rect &rect) const override
Determines if this geometry, transformed by the given transform, will completely cover all surface ar...
Definition: cover_geometry.cc:56
impeller::PrimitiveType::kTriangleStrip
@ kTriangleStrip
render_pass.h
impeller::CoverGeometry::CoverGeometry
CoverGeometry()
impeller::Rect
TRect< Scalar > Rect
Definition: rect.h:661
impeller::TRect< Scalar >::MakeSize
constexpr static TRect MakeSize(const TSize< U > &size)
Definition: rect.h:146
impeller::TRect< Scalar >::MakeMaximum
constexpr static TRect MakeMaximum()
Definition: rect.h:174
impeller::ComputeUVGeometryForRect
GeometryResult ComputeUVGeometryForRect(Rect source_rect, Rect texture_bounds, Matrix effect_transform, const ContentContext &renderer, const Entity &entity, RenderPass &pass)
Computes geometry and UV coordinates for a rectangle to be rendered.
Definition: geometry.cc:113
impeller
Definition: aiks_blur_unittests.cc:20
impeller::kPosition
@ kPosition
Definition: geometry.h:50
impeller::TRect< Scalar >
impeller::Matrix
A 4x4 matrix using column-major storage.
Definition: matrix.h:37