triangle_group_limit_set/initcairo.h

#ifndef INITCAIRO_H
#define INITCAIRO_H

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <unistd.h>

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#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;
	unsigned int width;
	unsigned int height;

	// these things will be written by updateDimensions()
	double scalefactor;
	double center_x;
	double center_y;
	double radius;
} DrawingContext;

typedef struct {
	DrawingContext *context;
	Display *display;
	Window win;
	Colormap cmap;
	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;
} GraphicsInfo;

GraphicsInfo *initCairo(int screen, int mask, int width, int height, const char *name);
void destroyCairo(GraphicsInfo *info);

void startTimer(GraphicsInfo *info);
void waitUpdateTimer(GraphicsInfo *info);
int checkEvents(GraphicsInfo *info, int (*process)(GraphicsInfo*, XEvent*), void (*draw)(DrawingContext *));
void updateDimensions(DrawingContext *ctx);

#endif