124 lines
3.9 KiB
C++
124 lines
3.9 KiB
C++
#pragma once
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#include <memory>
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#include <vector>
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#include "common.hpp"
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#include "events/signal_fwd.hpp"
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#include "events/signal_receiver.hpp"
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#include "x11/extensions/fwd.hpp"
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#include "x11/types.hpp"
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POLYBAR_NS
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class logger;
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namespace cairo {
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class surface;
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class xcb_surface;
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} // namespace cairo
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class bg_slice {
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public:
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~bg_slice();
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// copying bg_slices is not allowed
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bg_slice(const bg_slice&) = delete;
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bg_slice& operator=(const bg_slice&) = delete;
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/**
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* Get the current desktop background at the location of this slice.
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* The returned pointer is only valid as long as the slice itself is alive.
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*
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* This function is fast, since the current desktop background is cached.
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*/
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cairo::surface* get_surface() const {
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return m_surface.get();
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}
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private:
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bg_slice(connection& conn, const logger& log, xcb_rectangle_t rect, xcb_window_t window, xcb_visualtype_t* visual);
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// standard components
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connection& m_connection;
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// area covered by this slice
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xcb_rectangle_t m_rect{0, 0, 0U, 0U};
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xcb_window_t m_window;
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// cache for the root window background at this slice's position
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xcb_pixmap_t m_pixmap{XCB_NONE};
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unique_ptr<cairo::xcb_surface> m_surface;
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xcb_gcontext_t m_gcontext{XCB_NONE};
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void allocate_resources(const logger& log, xcb_visualtype_t* visual);
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void free_resources();
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friend class background_manager;
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};
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/**
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* \brief Class to keep track of the desktop background used to support pseudo-transparency
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*
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* For pseudo-transparency that bar needs access to the desktop background.
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* We only need to store the slice of the background image which is covered by the bar window,
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* so this class takes a rectangle that limits what part of the background is stored.
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*/
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class background_manager : public signal_receiver<SIGN_PRIORITY_SCREEN, signals::ui::update_geometry>,
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public xpp::event::sink<evt::property_notify> {
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public:
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using make_type = background_manager&;
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static make_type make();
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/**
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* Initializes a new background_manager that by default does not observe anything.
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*
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* To observe a slice of the background you need to call background_manager::activate.
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*/
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explicit background_manager(connection& conn, signal_emitter& sig, const logger& log);
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~background_manager();
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/**
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* Starts observing a rectangular slice of the desktop background.
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*
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* After calling this function, you can obtain the current slice of the desktop background
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* by calling get_surface on the returned bg_slice object.
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* Whenever the background slice changes (for example, due to bar position changes or because
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* the user changed the desktop background) the class emits a signals::ui::update_background event.
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*
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* You should only call this function once and then re-use the returned bg_slice because the bg_slice
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* caches the background. If you don't need the background anymore, destroy the shared_ptr to free up
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* resources.
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*
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* \param rect Slice of the background to observe (coordinates relative to window).
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* \param window Coordinates are interpreted relative to this window
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*/
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std::shared_ptr<bg_slice> observe(xcb_rectangle_t rect, xcb_window_t window);
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void handle(const evt::property_notify& evt) override;
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bool on(const signals::ui::update_geometry&) override;
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private:
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void activate();
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void deactivate();
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// references to standard components
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connection& m_connection;
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signal_emitter& m_sig;
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const logger& m_log;
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// list of slices that need to be filled with the desktop background
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std::vector<std::weak_ptr<bg_slice>> m_slices;
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// required values for fetching the root window's background
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xcb_visualtype_t* m_visual{nullptr};
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// true if we are currently attached as a listener for desktop background changes
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bool m_attached{false};
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void allocate_resources();
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void free_resources();
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void fetch_root_pixmap();
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};
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POLYBAR_NS_END
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