2 * vim:ts=4:sw=4:expandtab
4 * © 2015 Ingo Bürk and contributors (see also: LICENSE)
6 * cairo_util.c: Utility for operations using cairo.
13 #include <xcb/xcb_aux.h>
14 #include <cairo/cairo-xcb.h>
19 xcb_connection_t *xcb_connection;
20 xcb_visualtype_t *visual_type;
23 * Initialize the cairo surface to represent the given drawable.
26 void cairo_surface_init(surface_t *surface, xcb_drawable_t drawable, int width, int height) {
27 surface->id = drawable;
29 surface->gc = xcb_generate_id(xcb_connection);
30 xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection, surface->gc, surface->id, 0, NULL);
31 if (xcb_request_failed(gc_cookie, "Could not create graphical context"))
34 surface->surface = cairo_xcb_surface_create(xcb_connection, surface->id, visual_type, width, height);
35 surface->cr = cairo_create(surface->surface);
39 * Destroys the surface.
42 void cairo_surface_free(surface_t *surface) {
43 xcb_free_gc(xcb_connection, surface->gc);
44 cairo_surface_destroy(surface->surface);
45 cairo_destroy(surface->cr);
49 * Parses the given color in hex format to an internal color representation.
50 * Note that the input must begin with a hash sign, e.g., "#3fbc59".
53 color_t cairo_hex_to_color(const char *color) {
55 if (strlen(color) == strlen("#rrggbbaa")) {
59 alpha[0] = alpha[1] = 'F';
63 {color[1], color[2], '\0'},
64 {color[3], color[4], '\0'},
65 {color[5], color[6], '\0'},
66 {alpha[0], alpha[1], '\0'}};
69 .red = strtol(groups[0], NULL, 16) / 255.0,
70 .green = strtol(groups[1], NULL, 16) / 255.0,
71 .blue = strtol(groups[2], NULL, 16) / 255.0,
72 .alpha = strtol(groups[3], NULL, 16) / 255.0,
73 .colorpixel = get_colorpixel(color)};
77 * Set the given color as the source color on the surface.
80 void cairo_set_source_color(surface_t *surface, color_t color) {
81 cairo_set_source_rgba(surface->cr, color.red, color.green, color.blue, color.alpha);