lazy_drawable_holder.h

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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.
 
#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_LAZY_DRAWABLE_HOLDER_H_
#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_LAZY_DRAWABLE_HOLDER_H_
 
#include <Metal/Metal.h>
 
#include <future>
#include "impeller/core/texture_descriptor.h"
#include "impeller/renderer/backend/metal/texture_mtl.h"
 
@protocol CAMetalDrawable;
@class CAMetalLayer;
 
namespace impeller {
 
/// @brief Create a deferred drawable from a CAMetalLayer.
std::shared_future<id<CAMetalDrawable>> GetDrawableDeferred(
    CAMetalLayer* layer);
 
/// @brief Create a TextureMTL from a deferred drawable.
///
///        This function is safe to call multiple times and will only call
///        nextDrawable once.
std::shared_ptr<TextureMTL> CreateTextureFromDrawableFuture(
    TextureDescriptor desc,
    const std::shared_future<id<CAMetalDrawable>>& drawble_future);
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_LAZY_DRAWABLE_HOLDER_H_