| // Copyright 2019 The Chromium 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 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/callback_forward.h" |
| #include "base/component_export.h" |
| #include "base/macros.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/events/platform/x11/x11_event_source.h" |
| #include "ui/gfx/geometry/size.h" |
| #include "ui/gfx/x/event.h" |
| #include "ui/gfx/x/shm.h" |
| #include "ui/gfx/x/x11.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 XEventDispatcher { |
| public: |
| XShmImagePool(x11::Connection* connection, |
| x11::Drawable drawable, |
| x11::VisualId visual, |
| int depth, |
| std::size_t max_frames_pending, |
| bool enable_multibuffering); |
| |
| ~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; |
| 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{}; |
| }; |
| |
| // XEventDispatcher: |
| bool DispatchXEvent(x11::Event* xev) override; |
| |
| void Cleanup(); |
| |
| x11::Connection* const 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_); |
| |
| DISALLOW_COPY_AND_ASSIGN(XShmImagePool); |
| }; |
| |
| } // namespace ui |
| |
| #endif // UI_BASE_X_X11_SHM_IMAGE_POOL_H_ |