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// Copyright 2021 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_OZONE_PLATFORM_WAYLAND_HOST_WAYLAND_BUFFER_BACKING_H_
#define UI_OZONE_PLATFORM_WAYLAND_HOST_WAYLAND_BUFFER_BACKING_H_
#include "base/containers/flat_map.h"
#include "base/functional/callback_forward.h"
#include "base/memory/raw_ptr.h"
#include "drm_fourcc.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/ozone/platform/wayland/common/wayland_object.h"
namespace ui {
class WaylandSurface;
class WaylandBufferHandle;
class WaylandConnection;
// This represents a dmabuf/shm buffer, which the GPU process creates when
// CreateBuffer is called. It's used for asynchronous buffer creation. It
// dynamically requests wl_buffer objects when a buffer should be attached to a
// wl_surface.
//
// Has one-to-many relationship with WaylandBufferHandle.
class WaylandBufferBacking {
public:
enum class BufferBackingType {
kShm = 0,
kDmabuf = 1,
kSolidColor = 2,
kSinglePixel = 3,
};
WaylandBufferBacking() = delete;
WaylandBufferBacking(const WaylandBufferBacking&) = delete;
WaylandBufferBacking& operator=(const WaylandBufferBacking&) = delete;
WaylandBufferBacking(const WaylandConnection* connection,
uint32_t buffer_id,
const gfx::Size& size,
uint32_t format = DRM_FORMAT_INVALID);
virtual ~WaylandBufferBacking();
const WaylandConnection* connection() const { return connection_; }
uint32_t format() const { return format_; }
uint32_t id() const { return buffer_id_; }
gfx::Size size() const { return size_; }
// Whether linux_explicit_synchronization extension is enabled. It is an
// extension that completely replaces base protocol's wl_buffer.release
// events.
bool UseExplicitSyncRelease() const;
// Returns a wl_buffer wrapper that can be attached to the |requestor|.
// Requests a new wl_buffer if such a wl_buffer does not exist.
WaylandBufferHandle* EnsureBufferHandle(WaylandSurface* requestor = nullptr);
// Same as above but does not do the requesting.
WaylandBufferHandle* GetBufferHandle(WaylandSurface* requestor);
// Returns type of the backing. See BufferBackingType.
virtual BufferBackingType GetBackingType() const = 0;
private:
// Non-owned pointer to the main connection.
raw_ptr<const WaylandConnection> connection_;
// DRM buffer format if specified, otherwise DRM_FORMAT_INVALID (0)
const uint32_t format_;
// Requests a new wl_buffer. |callback| will be run with the created wl_buffer
// object when creation is complete.
virtual void RequestBufferHandle(
base::OnceCallback<void(wl::Object<wl_buffer>)> callback) = 0;
// Use |kInvalidBufferId| to commit surface state without updating wl_buffer.
constexpr static uint32_t kInvalidBufferId = 0u;
// The id of this buffer.
const uint32_t buffer_id_;
// Actual buffer size in pixels.
const gfx::Size size_;
// Collection of wl_buffers objects backed by this backing. Maintains the
// relationship of wl_surfaces to wl_buffers, corresponding to the
// wl_surface.attach(wl_buffer) request. |buffer_handles_[nullptr]| represents
// an anonymous WaylandBufferHandle not attached to any wl_surface yet.
base::flat_map<WaylandSurface*, std::unique_ptr<WaylandBufferHandle>>
buffer_handles_;
};
} // namespace ui
#endif // UI_OZONE_PLATFORM_WAYLAND_HOST_WAYLAND_BUFFER_BACKING_H_
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