/* Copyright (C) 1989, 1992, 1993, 1994 Aladdin Enterprises.  All rights reserved.
  
  This file is part of Aladdin Ghostscript.
  
  Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
  or distributor accepts any responsibility for the consequences of using it,
  or for whether it serves any particular purpose or works at all, unless he
  or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
  License (the "License") for full details.
  
  Every copy of Aladdin Ghostscript must include a copy of the License,
  normally in a plain ASCII text file named PUBLIC.  The License grants you
  the right to copy, modify and redistribute Aladdin Ghostscript, but only
  under certain conditions described in the License.  Among other things, the
  License requires that the copyright notice and this notice be preserved on
  all copies.
*/

/* gscolor.c */
/* Level 1 extended color operators for Ghostscript library */
#include "gx.h"
#include "gserrors.h"
#include "gsstruct.h"
#include "gscspace.h"
#include "gsccolor.h"
#include "gxdcconv.h"
#include "gxdevice.h"			/* for gx_color_index */
#include "gxcmap.h"
#include "gzstate.h"
#include "gscolor1.h"

/* Imports from gscolor.c */
void load_transfer_map(P3(gs_state *, gx_transfer_map *, floatp));

/* Imported from gsht.c */
void gx_set_effective_transfer(P1(gs_state *));

/* Define the CMYK color space type. */
extern cs_proc_remap_color(gx_remap_DeviceCMYK);
extern cs_proc_concretize_color(gx_concretize_DeviceCMYK);
extern cs_proc_remap_concrete_color(gx_remap_concrete_DCMYK);
private cs_proc_init_color(gx_init_paint_4);
const gs_color_space_type
	gs_color_space_type_DeviceCMYK =
	 { gs_color_space_index_DeviceCMYK, 4, true,
	   gx_init_paint_4, gx_same_concrete_space,
	   gx_concretize_DeviceCMYK, gx_remap_concrete_DCMYK,
	   gx_remap_DeviceCMYK, gx_no_install_cspace,
	   gx_no_adjust_cspace_count, gx_no_adjust_color_count,
	   gx_no_cspace_enum_ptrs, gx_no_cspace_reloc_ptrs
	 };

 /* Initialize a CMYK color. */
extern void gx_init_paint_3(P2(gs_client_color *, const gs_color_space *));
private void
gx_init_paint_4(gs_client_color *pcc, const gs_color_space *pcs)
{	pcc->paint.values[3] = 1.0;
	gx_init_paint_3(pcc, pcs);
}

/* setcmykcolor */
int
gs_setcmykcolor(gs_state *pgs, floatp c, floatp m, floatp y, floatp k)
{	gs_client_color *pcc = pgs->ccolor;
	if ( pgs->in_cachedevice ) return_error(gs_error_undefined);
	cs_adjust_counts(pgs, -1);
	pcc->paint.values[0] = c;
	pcc->paint.values[1] = m;
	pcc->paint.values[2] = y;
	pcc->paint.values[3] = k;
	pcc->pattern = 0;			/* for GC */
	pgs->color_space->type = &gs_color_space_type_DeviceCMYK;
	gx_unset_dev_color(pgs);
	return 0;
}

/* currentcmykcolor */
int
gs_currentcmykcolor(const gs_state *pgs, float pr4[4])
{	const gs_client_color *pcc = pgs->ccolor;
	switch ( pgs->color_space->type->index )
	{
	case gs_color_space_index_DeviceGray:
		pr4[0] = pr4[1] = pr4[2] = 0.0;
		pr4[3] = 1.0 - pcc->paint.values[0];
		break;
	case gs_color_space_index_DeviceRGB:
	{	frac fcmyk[4];
		color_rgb_to_cmyk(
			float2frac(pcc->paint.values[0]),
			float2frac(pcc->paint.values[1]),
			float2frac(pcc->paint.values[2]),
			pgs, fcmyk);
		pr4[0] = frac2float(fcmyk[0]);
		pr4[1] = frac2float(fcmyk[1]);
		pr4[2] = frac2float(fcmyk[2]);
		pr4[3] = frac2float(fcmyk[3]);
	}	break;
	case gs_color_space_index_DeviceCMYK:
		pr4[0] = pcc->paint.values[0];
		pr4[1] = pcc->paint.values[1];
		pr4[2] = pcc->paint.values[2];
		pr4[3] = pcc->paint.values[3];
		break;
	default:
		pr4[0] = pr4[1] = pr4[2] = 0.0;
		pr4[3] = 1.0;
	}
	return 0;
}

/* setblackgeneration */
/* Remap=0 is used by the interpreter. */
int
gs_setblackgeneration(gs_state *pgs, gs_mapping_proc proc)
{	return gs_setblackgeneration_remap(pgs, proc, true);
}
int
gs_setblackgeneration_remap(gs_state *pgs, gs_mapping_proc proc, bool remap)
{	rc_unshare_struct(pgs->black_generation, gx_transfer_map,
			  &st_transfer_map, pgs->memory,
			  return_error(gs_error_VMerror),
			  "gs_setblackgeneration");
	pgs->black_generation->proc = proc;
	if ( remap )
	{	load_transfer_map(pgs, pgs->black_generation, 0.0);
		gx_unset_dev_color(pgs);
	}
	return 0;
}

/* currentblackgeneration */
gs_mapping_proc
gs_currentblackgeneration(const gs_state *pgs)
{	return pgs->black_generation->proc;
}

/* setundercolorremoval */
/* Remap=0 is used by the interpreter. */
int
gs_setundercolorremoval(gs_state *pgs, gs_mapping_proc proc)
{	return gs_setundercolorremoval_remap(pgs, proc, true);
}
int
gs_setundercolorremoval_remap(gs_state *pgs, gs_mapping_proc proc, bool remap)
{	rc_unshare_struct(pgs->undercolor_removal, gx_transfer_map,
			  &st_transfer_map, pgs->memory,
			  return_error(gs_error_VMerror),
			  "gs_setundercolorremoval");
	pgs->undercolor_removal->proc = proc;
	if ( remap )
	{	load_transfer_map(pgs, pgs->undercolor_removal, -1.0);
		gx_unset_dev_color(pgs);
	}
	return 0;
}

/* currentundercolorremoval */
gs_mapping_proc
gs_currentundercolorremoval(const gs_state *pgs)
{	return pgs->undercolor_removal->proc;
}

/* setcolortransfer */
/* Remap=0 is used by the interpreter. */
int
gs_setcolortransfer_remap(gs_state *pgs, gs_mapping_proc red_proc,
  gs_mapping_proc green_proc, gs_mapping_proc blue_proc,
  gs_mapping_proc gray_proc, bool remap)
{	gx_transfer_colored *ptran = &pgs->set_transfer.colored;
	gx_transfer_colored old;
	old = *ptran;
	rc_unshare_struct(ptran->gray, gx_transfer_map, &st_transfer_map,
			  pgs->memory, goto fgray, "gs_setcolortransfer");
	rc_unshare_struct(ptran->red, gx_transfer_map, &st_transfer_map,
			  pgs->memory, goto fred, "gs_setcolortransfer");
	rc_unshare_struct(ptran->green, gx_transfer_map, &st_transfer_map,
			  pgs->memory, goto fgreen, "gs_setcolortransfer");
	rc_unshare_struct(ptran->blue, gx_transfer_map, &st_transfer_map,
			  pgs->memory, goto fblue, "gs_setcolortransfer");
	ptran->red->proc = red_proc;
	ptran->green->proc = green_proc;
	ptran->blue->proc = blue_proc;
	ptran->gray->proc = gray_proc;
	if ( remap )
	{	load_transfer_map(pgs, ptran->red, 0.0);
		load_transfer_map(pgs, ptran->green, 0.0);
		load_transfer_map(pgs, ptran->blue, 0.0);
		load_transfer_map(pgs, ptran->gray, 0.0);
		gx_set_effective_transfer(pgs);
		gx_unset_dev_color(pgs);
	}
	return 0;
fblue:	rc_assign(ptran->green, old.green, pgs->memory, "setcolortransfer");
fgreen:	rc_assign(ptran->red, old.red, pgs->memory, "setcolortransfer");
fred:	rc_assign(ptran->gray, old.gray, pgs->memory, "setcolortransfer");
fgray:	return_error(gs_error_VMerror);
}
int
gs_setcolortransfer(gs_state *pgs, gs_mapping_proc red_proc,
  gs_mapping_proc green_proc, gs_mapping_proc blue_proc,
  gs_mapping_proc gray_proc)
{	return gs_setcolortransfer_remap(pgs, red_proc, green_proc,
					 blue_proc, gray_proc, true);
}

/* currentcolortransfer */
void
gs_currentcolortransfer(const gs_state *pgs, gs_mapping_proc procs[4])
{	const gx_transfer_colored *ptran = &pgs->set_transfer.colored;
	procs[0] = ptran->red->proc;
	procs[1] = ptran->green->proc;
	procs[2] = ptran->blue->proc;
	procs[3] = ptran->gray->proc;
}