rect_geometry.cc

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// 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 "impeller/entity/geometry/rect_geometry.h"
 
namespace impeller {
 
RectGeometry::RectGeometry(Rect rect) : rect_(rect) {}
 
RectGeometry::~RectGeometry() = default;
 
GeometryResult RectGeometry::GetPositionBuffer(const ContentContext& renderer,
                                               const Entity& entity,
                                               RenderPass& pass) const {
  auto& host_buffer = renderer.GetTransientsBuffer();
  return GeometryResult{
      .type = PrimitiveType::kTriangleStrip,
      .vertex_buffer =
          {
              .vertex_buffer = host_buffer.Emplace(
                  rect_.GetPoints().data(), 8 * sizeof(float), alignof(float)),
              .vertex_count = 4,
              .index_type = IndexType::kNone,
          },
      .transform = entity.GetShaderTransform(pass),
  };
}
 
std::optional<Rect> RectGeometry::GetCoverage(const Matrix& transform) const {
  return rect_.TransformBounds(transform);
}
 
bool RectGeometry::CoversArea(const Matrix& transform, const Rect& rect) const {
  if (!transform.IsTranslationScaleOnly()) {
    return false;
  }
  Rect coverage = rect_.TransformBounds(transform);
  return coverage.Contains(rect);
}
 
bool RectGeometry::IsAxisAlignedRect() const {
  return true;
}
 
}  // namespace impeller