snapshot.h

Go to the documentation of this file.

// 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.
 
#ifndef FLUTTER_IMPELLER_RENDERER_SNAPSHOT_H_
#define FLUTTER_IMPELLER_RENDERER_SNAPSHOT_H_
 
#include <functional>
#include <memory>
#include <vector>
 
#include "impeller/core/formats.h"
#include "impeller/core/sampler_descriptor.h"
#include "impeller/core/texture.h"
#include "impeller/geometry/matrix.h"
#include "impeller/geometry/rect.h"
 
namespace impeller {
 
class ContentContext;
class Entity;
 
/// Represents a texture and its intended draw transform/sampler configuration.
struct Snapshot {
  std::shared_ptr<Texture> texture;
  /// The transform that should be applied to this texture for rendering.
  Matrix transform;
 
  SamplerDescriptor sampler_descriptor =
      SamplerDescriptor("Default Snapshot Sampler",
                        MinMagFilter::kLinear,
                        MinMagFilter::kLinear,
                        MipFilter::kNearest);
 
  Scalar opacity = 1.0f;
 
  std::optional<Rect> GetCoverage() const;
 
  /// @brief  Get the transform that converts screen space coordinates to the UV
  ///         space of this snapshot.
  std::optional<Matrix> GetUVTransform() const;
 
  /// @brief  Map a coverage rect to this filter input's UV space.
  ///         Result order: Top left, top right, bottom left, bottom right.
  std::optional<std::array<Point, 4>> GetCoverageUVs(
      const Rect& coverage) const;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_RENDERER_SNAPSHOT_H_