| Flutter Impeller |

cover_geometry.cc
Go to the documentation of this file.
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 std::optional<Rect> CoverGeometry::GetCoverage(const Matrix& transform) const {
37 return Rect::MakeMaximum();
38 }
39
40 bool CoverGeometry::CoversArea(const Matrix& transform,
41 const Rect& rect) const {
42 return true;
43 }
44
45 bool CoverGeometry::CanApplyMaskFilter() const {
46 return false;
47 }
48
49 } // namespace impeller
impeller::CoverGeometry::CanApplyMaskFilter
bool CanApplyMaskFilter() const override
Definition: cover_geometry.cc:45
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:40
impeller::CoverGeometry::CoverGeometry
CoverGeometry()
cover_geometry.h
transform
Matrix transform
Definition: gaussian_blur_filter_contents.cc:214
impeller
Definition: allocation.cc:12
impeller::PrimitiveType::kTriangleStrip
@ kTriangleStrip
impeller::IndexType::k16bit
@ k16bit
render_pass.h
impeller::Matrix
A 4x4 matrix using column-major storage.
Definition: matrix.h:37
impeller::TRect< Scalar >
impeller::TRect< Scalar >::MakeSize
constexpr static TRect MakeSize(const TSize< U > &size)
Definition: rect.h:150
impeller::TRect< Scalar >::MakeMaximum
constexpr static TRect MakeMaximum()
Definition: rect.h:188