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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_BASE_X_X11_SHM_IMAGE_POOL_H_
#define UI_BASE_X_X11_SHM_IMAGE_POOL_H_
#include <cstring>
#include <list>
#include <vector>
#include "base/component_export.h"
#include "base/functional/callback_forward.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/sequence_checker.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "ui/base/x/x11_util.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/x/event.h"
#include "ui/gfx/x/shm.h"
namespace ui {
// Creates XImages backed by shared memory that will be shared with the X11
// server for processing.
class COMPONENT_EXPORT(UI_BASE_X) XShmImagePool : public x11::EventObserver {
public:
XShmImagePool(x11::Connection* connection,
x11::Drawable drawable,
x11::VisualId visual,
int depth,
std::size_t max_frames_pending,
bool enable_multibuffering);
XShmImagePool(const XShmImagePool&) = delete;
XShmImagePool& operator=(const XShmImagePool&) = delete;
~XShmImagePool() override;
bool Resize(const gfx::Size& pixel_size);
// Is XSHM supported by the server and are the shared buffers ready for use?
bool Ready();
// Obtain state for the current frame.
SkBitmap& CurrentBitmap();
SkCanvas* CurrentCanvas();
x11::Shm::Seg CurrentSegment();
// Switch to the next cached frame. CurrentBitmap() and CurrentImage() will
// change to reflect the new frame.
void SwapBuffers(base::OnceCallback<void(const gfx::Size&)> callback);
protected:
void DispatchShmCompletionEvent(x11::Shm::CompletionEvent event);
private:
friend class base::RefCountedThreadSafe<XShmImagePool>;
struct FrameState {
FrameState();
~FrameState();
x11::Shm::Seg shmseg{};
int shmid = 0;
raw_ptr<void> shmaddr = nullptr;
bool shmem_attached_to_server = false;
SkBitmap bitmap;
std::unique_ptr<SkCanvas> canvas;
};
struct SwapClosure {
SwapClosure();
~SwapClosure();
base::OnceClosure closure;
x11::Shm::Seg shmseg{};
};
// x11::EventObserver:
void OnEvent(const x11::Event& xev) override;
void Cleanup();
const raw_ptr<x11::Connection> connection_;
const x11::Drawable drawable_;
const x11::VisualId visual_;
const int depth_;
const bool enable_multibuffering_;
bool ready_ = false;
gfx::Size pixel_size_;
std::size_t frame_bytes_ = 0;
std::vector<FrameState> frame_states_;
std::size_t current_frame_index_ = 0;
std::list<SwapClosure> swap_closures_;
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace ui
#endif // UI_BASE_X_X11_SHM_IMAGE_POOL_H_
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