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 {color[1], color[2], '\0'},
56 {color[3], color[4], '\0'},
57 {color[5], color[6], '\0'}};
60 .red = strtol(groups[0], NULL, 16) / 255.0,
61 .green = strtol(groups[1], NULL, 16) / 255.0,
62 .blue = strtol(groups[2], NULL, 16) / 255.0,
63 .colorpixel = get_colorpixel(color)};
67 * Set the given color as the source color on the surface.
70 void cairo_set_source_color(surface_t *surface, color_t color) {
71 cairo_set_source_rgb(surface->cr, color.red, color.green, color.blue);
75 * Draw the given text using libi3.
76 * This function also marks the surface dirty which is needed if other means of
77 * drawing are used. This will be the case when using XCB to draw text.
80 void cairo_draw_text(i3String *text, surface_t *surface, color_t fg_color, color_t bg_color, int x, int y, int max_width) {
81 set_font_colors(surface->gc, fg_color.colorpixel, bg_color.colorpixel);
82 draw_text(text, surface->id, surface->gc, visual_type, x, y, max_width);
84 cairo_surface_mark_dirty(surface->surface);
88 * Draws a filled rectangle.
89 * This function is a convenience wrapper and takes care of flushing the
90 * surface as well as restoring the cairo state.
91 * Note that the drawing is done using CAIRO_OPERATOR_SOURCE.
94 void cairo_draw_rectangle(surface_t *surface, color_t color, double x, double y, double w, double h) {
95 cairo_save(surface->cr);
97 /* Using the SOURCE operator will copy both color and alpha information directly
98 * onto the surface rather than blending it. This is a bit more efficient and
99 * allows better color control for the user when using opacity. */
100 cairo_set_operator(surface->cr, CAIRO_OPERATOR_SOURCE);
101 cairo_set_source_color(surface, color);
103 cairo_rectangle(surface->cr, x, y, w, h);
104 cairo_fill(surface->cr);
106 /* Make sure we flush the surface for any text drawing operations that could follow.
107 * Since we support drawing text via XCB, we need this. */
108 cairo_surface_flush(surface->surface);
110 cairo_restore(surface->cr);
114 * Copies a surface onto another surface.
115 * Note that the drawing is done using CAIRO_OPERATOR_SOURCE.
118 void cairo_copy_surface(surface_t *src, surface_t *dest, double src_x, double src_y,
119 double dest_x, double dest_y, double dest_w, double dest_h) {
120 cairo_save(dest->cr);
122 /* Using the SOURCE operator will copy both color and alpha information directly
123 * onto the surface rather than blending it. This is a bit more efficient and
124 * allows better color control for the user when using opacity. */
125 cairo_set_operator(dest->cr, CAIRO_OPERATOR_SOURCE);
126 cairo_set_source_surface(dest->cr, src->surface, src_x, src_y);
128 cairo_rectangle(dest->cr, dest_x, dest_y, dest_w, dest_h);
129 cairo_fill(dest->cr);
131 /* Make sure we flush the surface for any text drawing operations that could follow.
132 * Since we support drawing text via XCB, we need this. */
133 cairo_surface_flush(dest->surface);
134 cairo_restore(dest->cr);