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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_COMMON_GRAPHICS_TEXTURE_H_
#define FLUTTER_COMMON_GRAPHICS_TEXTURE_H_
#include <map>
#include "flutter/display_list/dl_canvas.h"
#include "flutter/fml/macros.h"
#include "flutter/fml/synchronization/waitable_event.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkSamplingOptions.h"
class GrDirectContext;
namespace impeller {
class AiksContext;
};
namespace flutter {
class ContextListener {
public:
ContextListener();
~ContextListener();
// Called from raster thread.
virtual void OnGrContextCreated() = 0;
// Called from raster thread.
virtual void OnGrContextDestroyed() = 0;
private:
FML_DISALLOW_COPY_AND_ASSIGN(ContextListener);
};
class Texture : public ContextListener {
public:
struct PaintContext {
DlCanvas* canvas = nullptr;
GrDirectContext* gr_context = nullptr;
impeller::AiksContext* aiks_context = nullptr;
const DlPaint* paint = nullptr;
};
explicit Texture(int64_t id); // Called from UI or raster thread.
virtual ~Texture(); // Called from raster thread.
// Called from raster thread.
virtual void Paint(PaintContext& context,
const SkRect& bounds,
bool freeze,
const DlImageSampling sampling) = 0;
// Called on raster thread.
virtual void MarkNewFrameAvailable() = 0;
// Called on raster thread.
virtual void OnTextureUnregistered() = 0;
int64_t Id() { return id_; }
private:
int64_t id_;
FML_DISALLOW_COPY_AND_ASSIGN(Texture);
};
class TextureRegistry {
public:
TextureRegistry();
// Called from raster thread.
void RegisterTexture(const std::shared_ptr<Texture>& texture);
// Called from raster thread.
void RegisterContextListener(uintptr_t id,
std::weak_ptr<ContextListener> image);
// Called from raster thread.
void UnregisterTexture(int64_t id);
// Called from the raster thread.
void UnregisterContextListener(uintptr_t id);
// Called from raster thread.
std::shared_ptr<Texture> GetTexture(int64_t id);
// Called from raster thread.
void OnGrContextCreated();
// Called from raster thread.
void OnGrContextDestroyed();
private:
std::map<int64_t, std::shared_ptr<Texture>> mapping_;
size_t image_counter_ = 0;
// This map keeps track of registered context listeners by their own
// externally provided id. It indexes into ordered_images_.
std::map<uintptr_t, size_t> image_indices_;
// This map makes sure that iteration of images happens in insertion order
// (managed by image_counter_) so that images which depend on other images get
// re-created in the right order.
using InsertionOrderMap =
std::map<size_t, std::pair<uintptr_t, std::weak_ptr<ContextListener>>>;
InsertionOrderMap ordered_images_;
FML_DISALLOW_COPY_AND_ASSIGN(TextureRegistry);
};
} // namespace flutter
#endif // FLUTTER_COMMON_GRAPHICS_TEXTURE_H_