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//
// Definition of class Fl_Wayland_Graphics_Driver.
//
// Copyright 2021-2022 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
/**
\file Fl_Wayland_Graphics_Driver.H
\brief Definition of Wayland graphics driver.
*/
#ifndef FL_WAYLAND_GRAPHICS_DRIVER_H
#define FL_WAYLAND_GRAPHICS_DRIVER_H
/* Implementation note about buffers FLTK uses to support display graphics under Wayland.
Each window is associated to an FLTK-defined object of type struct wld_window
containing itself an FLTK-defined struct fl_wld_buffer object holding all graphics data.
Among members of this latter structure are:
- struct wl_buffer wl_buffer
is a Wayland-defined type for a graphics buffer able to be attached to a wl_surface;
- void *data
points to the beginning of the memory zone where wl_buffer stores its graphics data;
- unsigned char *draw_buffer
contains a graphics buffer to which all Cairo drawings are directed;
draw_buffer and data both have the same organization called CAIRO_FORMAT_ARGB32 in Cairo parlance
and WL_SHM_FORMAT_ARGB8888 in Wayland parlance which means BGRA byte order.
- int width
gives the pixel width of the graphics buffer;
- int stride
gives the stride of this buffer;
- size_t data_size
gives the total buffer size in bytes (thus, data_size / stride gives the buffer height);
- struct wl_callback *cb
is used to synchronize drawing with the compositor during progressive drawing.
When a graphics scene is to be committed, the data_size bytes of draw_buffer are copied by memcpy()
starting at data, and wl_buffer is attached to the wl_surface which is committed for display
by wl_surface_commit().
*/
#include "../Cairo/Fl_Cairo_Graphics_Driver.H"
#include <stdint.h> // for uint32_t
struct fl_wld_buffer {
struct wl_buffer *wl_buffer;
void *data;
size_t data_size; // of wl_buffer and draw_buffer
int stride;
int width;
unsigned char *draw_buffer;
struct wl_callback *cb;
bool draw_buffer_needs_commit;
cairo_t *cairo_;
};
struct wld_window;
class Fl_Wayland_Graphics_Driver : public Fl_Cairo_Graphics_Driver {
private:
struct fl_wld_buffer *buffer_;
public:
Fl_Wayland_Graphics_Driver();
static const uint32_t wld_format;
void set_buffer(struct fl_wld_buffer *buffer, float scale = 0);
void set_color(Fl_Color i, unsigned c);
void copy_offscreen(int x, int y, int w, int h, Fl_Offscreen osrc, int srcx, int srcy);
static struct fl_wld_buffer *create_shm_buffer(int width, int height);
static void buffer_release(struct wld_window *window);
static void buffer_commit(struct wld_window *window, const struct wl_callback_listener*);
static void cairo_init(struct fl_wld_buffer *buffer, int width, int height, int stride, cairo_format_t format);
virtual void *gc();
virtual void gc(void *gc);
};
#endif // FL_WAYLAND_GRAPHICS_DRIVER_H
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