Move stuff to include/ and src/

src/xcb.c

@@ -0,0 +1,42 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <xcb/xcb.h>
+/* All the helper functions needed for efficiently using XCB */
+
+/*
+ * Returns the colorpixel to use for the given hex color (think of HTML).
+ *
+ * The hex_color has to start with #, for example #FF00FF.
+ *
+ * NOTE that get_colorpixel() does _NOT_ check the given color code for validity.
+ * This has to be done by the caller.
+ *
+ */
+uint32_t get_colorpixel(xcb_connection_t *conn, xcb_window_t window, char *hex) {
+	#define RGB_8_TO_16(i) (65535 * ((i) & 0xFF) / 255)
+        char strgroups[3][3] = {{hex[1], hex[2], '\0'},
+                                {hex[3], hex[4], '\0'},
+                                {hex[5], hex[6], '\0'}};
+	int rgb16[3] = {RGB_8_TO_16(strtol(strgroups[0], NULL, 16)),
+			RGB_8_TO_16(strtol(strgroups[1], NULL, 16)),
+			RGB_8_TO_16(strtol(strgroups[2], NULL, 16))};
+
+	xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
+
+	xcb_colormap_t colormapId = xcb_generate_id(conn);
+	xcb_create_colormap(conn, XCB_COLORMAP_ALLOC_NONE, colormapId, window, root_screen->root_visual);
+	xcb_alloc_color_reply_t *reply = xcb_alloc_color_reply(conn,
+			xcb_alloc_color(conn, colormapId, rgb16[0], rgb16[1], rgb16[2]), NULL);
+
+	if (!reply) {
+		printf("color fail\n");
+		exit(1);
+	}
+
+	uint32_t pixel = reply->pixel;
+	free(reply);
+	xcb_free_colormap(conn, colormapId);
+	return pixel;
+}