+/*
+ * vim:ts=4:sw=4:expandtab
+ *
+ * © 2015 Ingo Bürk and contributors (see also: LICENSE)
+ *
+ * cairo_util.c: Utility for operations using cairo.
+ *
+ */
+#include <stdlib.h>
+#include <err.h>
+#include <xcb/xcb.h>
+#include <xcb/xcb_aux.h>
+#include <cairo/cairo-xcb.h>
+
+#include "common.h"
+#include "libi3.h"
+
+xcb_connection_t *xcb_connection;
+xcb_screen_t *root_screen;
+
+/*
+ * Initialize the cairo surface to represent the given drawable.
+ *
+ */
+void cairo_surface_init(surface_t *surface, xcb_drawable_t drawable, int width, int height) {
+ surface->id = drawable;
+
+ surface->gc = xcb_generate_id(xcb_connection);
+ xcb_void_cookie_t gc_cookie = xcb_create_gc_checked(xcb_connection, surface->gc, surface->id, 0, NULL);
+ if (xcb_request_failed(gc_cookie, "Could not create graphical context"))
+ exit(EXIT_FAILURE);
+
+ surface->surface = cairo_xcb_surface_create(xcb_connection, surface->id, get_visualtype(root_screen), width, height);
+ surface->cr = cairo_create(surface->surface);
+}
+
+/*
+ * Destroys the surface.
+ *
+ */
+void cairo_surface_free(surface_t *surface) {
+ xcb_free_gc(xcb_connection, surface->gc);
+ cairo_surface_destroy(surface->surface);
+ cairo_destroy(surface->cr);
+}
+
+/*
+ * Parses the given color in hex format to an internal color representation.
+ * Note that the input must begin with a hash sign, e.g., "#3fbc59".
+ *
+ */
+color_t cairo_hex_to_color(const char *color) {
+ char groups[3][3] = {
+ {color[1], color[2], '\0'},
+ {color[3], color[4], '\0'},
+ {color[5], color[6], '\0'}};
+
+ return (color_t){
+ .red = strtol(groups[0], NULL, 16) / 255.0,
+ .green = strtol(groups[1], NULL, 16) / 255.0,
+ .blue = strtol(groups[2], NULL, 16) / 255.0,
+ .colorpixel = get_colorpixel(color)};
+}
+
+/*
+ * Set the given color as the source color on the surface.
+ *
+ */
+void cairo_set_source_color(surface_t *surface, color_t color) {
+ cairo_set_source_rgb(surface->cr, color.red, color.green, color.blue);
+}