render to image surface

initcairo.h

@@ -12,6 +12,10 @@
 #include <cairo.h>
 #include <cairo-xlib.h>
 
+#define STATUS_NOTHING 0
+#define STATUS_REDRAW 1
+#define STATUS_QUIT 2
+
 typedef struct {
 	cairo_t *cairo;
 	cairo_matrix_t matrix;
@@ -33,6 +37,11 @@ typedef struct {
 	Atom wm_protocols;
 	Atom wm_delete_window;
 	cairo_surface_t *surface;
+	cairo_t *front_context;
+
+	cairo_surface_t *buffer_surface;
+	unsigned char *buffer;
+
 	struct timeval start_time;
 	unsigned long frames;
 	double elapsed, frametime;