snapshot.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/renderer/snapshot.h"
 
#include <optional>
 
namespace impeller {
 
std::optional<Rect> Snapshot::GetCoverage() const {
  if (!texture) {
    return std::nullopt;
  }
  return Rect(Size(texture->GetSize())).TransformBounds(transform);
}
 
std::optional<Matrix> Snapshot::GetUVTransform() const {
  if (!texture || texture->GetSize().IsZero()) {
    return std::nullopt;
  }
  return Matrix::MakeScale(1 / Vector2(texture->GetSize())) *
         transform.Invert();
}
 
std::optional<std::array<Point, 4>> Snapshot::GetCoverageUVs(
    const Rect& coverage) const {
  auto uv_transform = GetUVTransform();
  if (!uv_transform.has_value()) {
    return std::nullopt;
  }
  return coverage.GetTransformedPoints(uv_transform.value());
}
 
}  // namespace impeller