/* Copyright (C) 1989, 1995, 1998 Aladdin Enterprises.  All rights reserved.
  
  This file is part of GNU Ghostscript.
  
  GNU Ghostscript is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
  to anyone for the consequences of using it or for whether it serves any
  particular purpose or works at all, unless he says so in writing.  Refer
  to the GNU General Public License for full details.
  
  Everyone is granted permission to copy, modify and redistribute GNU
  Ghostscript, but only under the conditions described in the GNU General
  Public License.  A copy of this license is supposed to have been given
  to you along with GNU Ghostscript so you can know your rights and
  responsibilities.  It should be in a file named COPYING.  Among other
  things, the copyright notice and this notice must be preserved on all
  copies.
*/

/*$RCSfile: gdevsvga.h,v $ $Revision: 1.2.2.1 $ */
/* Common definitions and procedures for SuperVGA drivers */
/* Requires gdevpcfb.h */

#ifndef gdevsvga_INCLUDED
#  define gdevsvga_INCLUDED

/* Common procedures */

	/* See gxdevice.h for the definitions of the procedures. */

dev_proc_close_device(svga_close);
dev_proc_map_rgb_color(svga_map_rgb_color);
dev_proc_map_color_rgb(svga_map_color_rgb);
dev_proc_fill_rectangle(svga_fill_rectangle);
dev_proc_copy_mono(svga_copy_mono);
dev_proc_copy_color(svga_copy_color);
dev_proc_get_params(svga_get_params);
dev_proc_put_params(svga_put_params);
dev_proc_get_bits(svga_get_bits);
dev_proc_copy_alpha(svga_copy_alpha);

/* Table structure for looking up graphics modes. */
typedef struct {
    int width, height;		/* "key" */
    int mode;			/* "value" */
} mode_info;

/* The device descriptor structure */
typedef struct gx_device_svga_s gx_device_svga;
struct gx_device_svga_s {
    gx_device_common;
    int (*get_mode) (P0());
    void (*set_mode) (P1(int));
    void (*set_page) (P3(gx_device_svga * fbdev, int pnum, int wnum));
    bool fixed_colors;		/* if true, used a fixed palette */
    const mode_info *mode;	/* BIOS display mode info */
    uint raster;		/* frame buffer bytes per line */
    int current_page;		/* current page */
    int wnum_read, wnum_write;	/* window #s for read vs. write */
    /* Following are device-specific. */
    union {
	struct {
	    void (*bios_set_page) (P2(int, int));	/* set-page function */
	    int pn_shift;	/* log2(64K/granularity) */
	} vesa;
	struct {
	    int select_reg;	/* page-select register */
	} atiw;
	struct {
	    int et_model;	/* 4 for ET4000, */
	    /* 3 for ET3000 */
	} tseng;
    } info;
};

/* The initial parameters map an appropriate fraction of */
/* the screen to a full-page coordinate space. */
/* This may or may not be what is desired! */
#define svga_color_device(procs, name, depth, maxv, dither, get_mode, set_mode, set_page) {\
	std_device_color_body(gx_device_svga, &procs, name,\
	  640, 480,\
	  480 / PAGE_HEIGHT_INCHES, 480 / PAGE_HEIGHT_INCHES,\
	  /*dci_color(*/depth, maxv, dither/*)*/),\
	 { 0 },		/* std_procs */\
	get_mode, set_mode, set_page,\
	0 /*fixed_colors*/\
   }
#define svga_device(procs, name, get_mode, set_mode, set_page)\
  svga_color_device(procs, name, 8, 31, 4, get_mode, set_mode, set_page)

/* Utility procedures */
void svga_init_colors(P1(gx_device *));
int svga_find_mode(P2(gx_device *, const mode_info *));
int svga_open(P1(gx_device *));

#endif /* gdevsvga_INCLUDED */
