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 
6 
8 
9 namespace impeller {
10 
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{
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 
41  const Rect& rect) const {
42  return true;
43 }
44 
46  return false;
47 }
48 
49 } // namespace impeller
bool CanApplyMaskFilter() const override
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...
A 4x4 matrix using column-major storage.
Definition: matrix.h:37
constexpr static TRect MakeSize(const TSize< U > &size)
Definition: rect.h:150
constexpr static TRect MakeMaximum()
Definition: rect.h:188