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#include <cairo-xcb.h>
#include "demo.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
struct xcb_device {
struct device base;
struct framebuffer fb;
xcb_connection_t *connection;
xcb_window_t drawable;
int double_buffered;
int async;
};
static void
destroy (struct framebuffer *fb)
{
}
static void
show (struct framebuffer *fb)
{
struct xcb_device *device = (struct xcb_device *) fb->device;
if (device->double_buffered) {
cairo_t *cr = cairo_create (device->base.scanout);
cairo_set_source_surface (cr, fb->surface, 0, 0);
cairo_paint (cr);
cairo_destroy (cr);
}
if (device->async) {
xcb_flush (device->connection);
} else {
cairo_rectangle_int_t r;
r.x = r.y = 0;
r.width = r.height = 1;
cairo_surface_unmap_image(device->base.scanout,
cairo_surface_map_to_image(device->base.scanout, &r));
}
//sleep(1);
}
static struct framebuffer *
get_fb (struct device *abstract_device)
{
struct xcb_device *device = (struct xcb_device *) abstract_device;
return &device->fb;
}
static xcb_visualtype_t *
lookup_visual (xcb_screen_t *s, xcb_visualid_t visual)
{
xcb_depth_iterator_t d;
d = xcb_screen_allowed_depths_iterator (s);
for (; d.rem; xcb_depth_next (&d)) {
xcb_visualtype_iterator_t v = xcb_depth_visuals_iterator (d.data);
for (; v.rem; xcb_visualtype_next (&v)) {
if (v.data->visual_id == visual)
return v.data;
}
}
return 0;
}
struct device *
xcb_open (int argc, char **argv)
{
struct xcb_device *device;
xcb_connection_t *c;
xcb_screen_t *s;
xcb_visualtype_t *v;
uint32_t values[] = { 1 };
int i;
c = xcb_connect (NULL, NULL);
if (c == NULL)
return NULL;
device = malloc (sizeof (struct xcb_device));
device->base.name = "xcb";
device->base.get_framebuffer = get_fb;
device->connection = c;
device->drawable = xcb_generate_id (c);
device->double_buffered = 1;
device->async = 0;
for (i = 1; i < argc; i++) {
if (strcmp (argv[i], "--single") == 0)
device->double_buffered = 0;
else if (strcmp (argv[i], "--async") == 0)
device->async = 1;
}
s = xcb_setup_roots_iterator (xcb_get_setup (c)).data;
v = lookup_visual (s, s->root_visual);
device->base.width = s->width_in_pixels;
device->base.height = s->height_in_pixels;
device_get_size (argc, argv, &device->base.width, &device->base.height);
xcb_create_window (c,
s->root_depth,
device->drawable,
s->root,
0, 0, device->base.width, device->base.height, 0,
XCB_WINDOW_CLASS_INPUT_OUTPUT,
s->root_visual,
XCB_CW_OVERRIDE_REDIRECT,
values);
xcb_map_window (c, device->drawable);
device->base.scanout = cairo_xcb_surface_create (c,
device->drawable,
v,
device->base.width,
device->base.height);
if (device->double_buffered) {
device->fb.surface = cairo_surface_create_similar (device->base.scanout,
CAIRO_CONTENT_COLOR,
device->base.width,
device->base.height);
} else {
device->fb.surface = cairo_surface_reference (device->base.scanout);
}
device->fb.device = &device->base;
device->fb.show = show;
device->fb.destroy = destroy;
return &device->base;
}
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