cairodriver.h

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/*!
   \file cairodriver/cairodriver.h
 
   \brief GRASS cairo display driver - header file
 
   (C) 2007-2008 by Lars Ahlzen and the GRASS Development Team
 
   This program is free software under the GNU General Public License
   (>=v2). Read the file COPYING that comes with GRASS for details.
 
   \author Lars Ahlzen <lars ahlzen.com> (original contributor)
   \author Glynn Clements
 */
 
#ifndef __CAIRODRIVER_H__
#define __CAIRODRIVER_H__
 
#include <grass/config.h>
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include <cairo.h>
 
#if !defined(USE_X11) || !CAIRO_HAS_XLIB_SURFACE || \
    CAIRO_VERSION < CAIRO_VERSION_ENCODE(1, 6, 0)
#undef CAIRO_HAS_XLIB_XRENDER_SURFACE
#define CAIRO_HAS_XLIB_XRENDER_SURFACE 0
#endif
 
#if CAIRO_HAS_XLIB_XRENDER_SURFACE
#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/Xrender.h>
#endif
 
#include <grass/gis.h>
 
#include "driver.h"
#include "driverlib.h"
 
#define DEFAULT_FILE_NAME "map.png"
 
#define HEADER_SIZE       64
 
/* Scale for converting colors from [0..255] to cairo's [0.0..1.0] */
#define COLORSCALE        (1.0 / 255.0)
#define CAIROCOLOR(a)     (((double)(a)) * COLORSCALE)
 
/* File types */
#define FTYPE_UNKNOWN     0
#define FTYPE_PPM         1
#define FTYPE_BMP         2
#define FTYPE_PNG         3
#define FTYPE_PDF         4
#define FTYPE_PS          5
#define FTYPE_SVG         6
#define FTYPE_X11         7
 
extern cairo_surface_t *surface;
extern cairo_t *cairo;
 
struct cairo_state {
    char *file_name;
    int file_type;
    int width, height, stride;
    unsigned char *grid;
    double bgcolor_r, bgcolor_g, bgcolor_b, bgcolor_a;
    int modified;
    int mapped;
#if CAIRO_HAS_XLIB_XRENDER_SURFACE
    Display *dpy;
    Drawable win;
    Screen *screen;
    XRenderPictFormat *format;
    int depth;
#endif
};
 
extern struct cairo_state ca;
 
extern const struct driver *Cairo_Driver(void);
 
extern void Cairo_Client_Close(void);
extern int Cairo_Graph_set(void);
extern const char *Cairo_Graph_get_file(void);
extern void Cairo_Graph_close(void);
extern void Cairo_Box(double, double, double, double);
extern void Cairo_Set_window(double, double, double, double);
extern void Cairo_Bitmap(int, int, int, const unsigned char *);
extern void Cairo_Color(int, int, int);
extern void Cairo_Erase(void);
extern void Cairo_begin_raster(int, int[2][2], double[2][2]);
extern int Cairo_raster(int, int, const unsigned char *, const unsigned char *,
                        const unsigned char *, const unsigned char *);
extern void Cairo_end_raster(void);
extern void Cairo_Begin(void);
extern void Cairo_Move(double, double);
extern void Cairo_Cont(double, double);
extern void Cairo_Close(void);
extern void Cairo_Stroke(void);
extern void Cairo_Fill(void);
extern void Cairo_Point(double, double);
extern void Cairo_Line_width(double);
extern void Cairo_Text(const char *);
extern void Cairo_text_box(const char *, double *, double *, double *,
                           double *);
extern void Cairo_set_font(const char *);
extern void Cairo_font_list(char ***, int *);
extern void Cairo_font_info(char ***, int *);
 
/* read.c */
extern void cairo_read_image(void);
extern void cairo_read_ppm(void);
extern void cairo_read_bmp(void);
extern void cairo_read_xid(void);
 
/* write.c */
extern void cairo_write_image(void);
extern void cairo_write_ppm(void);
extern void cairo_write_bmp(void);
extern void cairo_write_xid(void);
 
#endif /* __CAIRODRIVER_H__ */