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    Types: TextFile
    Names: »zcolor.c«

└─⟦a05ed705a⟧ Bits:30007078 DKUUG GNU 2/12/89
    └─⟦ff23ba0e6⟧ »./ghostscript-1.3.tar.Z« 
        └─⟦a24a58cd3⟧ 
            └─⟦this⟧ »zcolor.c« 

TextFile

/* Copyright (C) 1989 Aladdin Enterprises.  All rights reserved.
   Distributed by Free Software Foundation, Inc.

This file is part of Ghostscript.

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 Ghostscript General Public License for full details.

Everyone is granted permission to copy, modify and redistribute
Ghostscript, but only under the conditions described in the Ghostscript
General Public License.  A copy of this license is supposed to have been
given to you along with 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.  */

/* zcolor.c */
/* Color operators for GhostScript */
#include "ghost.h"
#include "errors.h"
#include "oper.h"
#include "alloc.h"
#include "store.h"
#include "gsmatrix.h"			/* for gs_state */
#include "gsstate.h"
#include "state.h"

/* Imported from util.c */
extern	int	num_params(P3(ref *, int, float *));
/* Imported from zgstate.c */
extern	void	tri_push(P2(ref *, float [3]));

/* Forward declarations */
private int color_to_par(P2(ref *, int (*)(P2(gs_color *, float [3]))));
private int par_to_color(P2(ref *, int (*)(P4(floatp, floatp, floatp, gs_color *))));
private int make_color(P1(ref *));

/* colorhsb */
int
zcolorhsb(register ref *op)
{	return color_to_par(op, gs_colorhsb);
}

/* colorrgb */
int
zcolorrgb(register ref *op)
{	return color_to_par(op, gs_colorrgb);
}

/* Common code for colorhsb and colorrgb */
private int
color_to_par(ref *op, int (*c2par)(P2(gs_color *, float [3])))
{	int code;
	float par[3];
	check_type(*op, t_color);
	if ( (code = (*c2par)(op->value.pcolor, par)) < 0 )
		return code;
	push(2);
	tri_push(op, par);
	return 0;
}

/* currentcolor */
int
zcurrentcolor(register ref *op)
{	int code;
	push(1);
	if (	(code = make_color(op)) < 0 ||
		(code = gs_currentcolor(igs, op->value.pcolor)) < 0
	   )
		pop(1);
	return code;
}

/* hsbcolor */
int
zhsbcolor(register ref *op)
{	return par_to_color(op, gs_hsbcolor);
}

/* rgbcolor */
int
zrgbcolor(register ref *op)
{	return par_to_color(op, gs_rgbcolor);
}

/* Common code for hsbcolor and rgbcolor */
private int
par_to_color(ref *op, int (*par2c)(P4(floatp, floatp, floatp, gs_color *)))
{	ref color;
	float par[3];
	int code;
	if (	(code = num_params(op, 3, par)) < 0 ||
		(code = make_color(&color)) < 0 ||
		(code = (*par2c)(par[0], par[1], par[2], color.value.pcolor)) < 0
	    )
		return code;
	op[-2] = color;
	pop(2);
	return code;
}


/* setcolor */
int
zsetcolor(register ref *op)
{	int code;
	check_type(*op, t_color);
	if ( (code = gs_setcolor(igs, op->value.pcolor)) < 0 )
		return code;
	pop(1);
	return 0;
}

/* ------ Initialization procedure ------ */

void
zcolor_op_init()
{	static op_def my_defs[] = {
		{"1colorhsb", zcolorhsb},
		{"1colorrgb", zcolorrgb},
		{"0currentcolor", zcurrentcolor},
		{"3hsbcolor", zhsbcolor},
		{"3rgbcolor", zrgbcolor},
		{"1setcolor", zsetcolor},
		op_def_end
	};
	z_op_init(my_defs);
}

/* ------ Internal routines ------ */

/* Make a color object */
private int
make_color(ref *op)
{	gs_color *cp = (gs_color *)alloc(gs_color_sizeof, "make_color");
	if ( cp == 0 ) return e_VMerror;
	make_tv(op, t_color, pcolor, cp);
	return 0;
}