/* Copyright (C) 2001-2006 Artifex Software, Inc.
   All Rights Reserved.
  
   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied, modified
   or distributed except as expressly authorized under the terms of that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: gsfont0.c 8022 2007-06-05 22:23:38Z giles $ */
/* Composite font operations for Ghostscript library */
#include "memory_.h"
#include "gx.h"
#include "gserrors.h"
#include "gsstruct.h"
#include "gxfixed.h"
#include "gsmatrix.h"
#include "gxdevice.h"
#include "gxdevmem.h"
#include "gxfcache.h"		/* gs_font_dir */
#include "gxfont.h"
#include "gxfont0.h"

/* Structure descriptor */
private struct_proc_enum_ptrs(font_type0_enum_ptrs);
private struct_proc_reloc_ptrs(font_type0_reloc_ptrs);

public_st_gs_font_type0();
private 
ENUM_PTRS_WITH(font_type0_enum_ptrs, gs_font_type0 *pfont)
ENUM_PREFIX(st_gs_font, gs_type0_data_max_ptrs);
ENUM_PTR(0, gs_font_type0, data.Encoding);
ENUM_PTR(1, gs_font_type0, data.FDepVector);
case 2:
switch (pfont->data.FMapType)
{
    case fmap_SubsVector:
	ENUM_RETURN_CONST_STRING_PTR(gs_font_type0,
				     data.SubsVector);
    case fmap_CMap:
	ENUM_RETURN_PTR(gs_font_type0, data.CMap);
    default:
	ENUM_RETURN(0);
}
ENUM_PTRS_END
private RELOC_PTRS_WITH(font_type0_reloc_ptrs, gs_font_type0 *pfont)
RELOC_PREFIX(st_gs_font);
RELOC_PTR(gs_font_type0, data.Encoding);
RELOC_PTR(gs_font_type0, data.FDepVector);
switch (pfont->data.FMapType)
{
    case fmap_SubsVector:
RELOC_CONST_STRING_PTR(gs_font_type0, data.SubsVector);
break;
    case fmap_CMap:
RELOC_PTR(gs_font_type0, data.CMap);
break;
    default:
;
}
RELOC_PTRS_END

/* Adjust a composite font by concatenating a given matrix */
/* to the FontMatrix of all descendant composite fonts. */
private int
gs_type0_adjust_matrix(gs_font_dir * pdir, gs_font_type0 * pfont,
		       const gs_matrix * pmat)
{
    gs_font **pdep = pfont->data.FDepVector;
    uint fdep_size = pfont->data.fdep_size;
    gs_font **ptdep;
    uint i;

    /* Check for any descendant composite fonts. */
    for (i = 0; i < fdep_size; i++)
	if (pdep[i]->FontType == ft_composite)
	    break;
    if (i == fdep_size)
	return 0;
    ptdep = gs_alloc_struct_array(pfont->memory, fdep_size, gs_font *,
				  &st_gs_font_ptr_element,
				  "gs_type0_adjust_font(FDepVector)");
    if (ptdep == 0)
	return_error(gs_error_VMerror);
    memcpy(ptdep, pdep, sizeof(gs_font *) * fdep_size);
    for (; i < fdep_size; i++)
	if (pdep[i]->FontType == ft_composite) {
	    int code = gs_makefont(pdir, pdep[i], pmat, &ptdep[i]);

	    if (code < 0)
		return code;
	}
    pfont->data.FDepVector = ptdep;
    return 0;
}

/* Finish defining a composite font, */
/* by adjusting its descendants' FontMatrices. */
int
gs_type0_define_font(gs_font_dir * pdir, gs_font * pfont)
{
    const gs_matrix *pmat = &pfont->FontMatrix;

    /* Check for the identity matrix, which is common in root fonts. */
    if (pmat->xx == 1.0 && pmat->yy == 1.0 &&
	pmat->xy == 0.0 && pmat->yx == 0.0 &&
	pmat->tx == 0.0 && pmat->ty == 0.0
	)
	return 0;
    return gs_type0_adjust_matrix(pdir, (gs_font_type0 *) pfont, pmat);
}

/* Finish scaling a composite font similarly. */
int
gs_type0_make_font(gs_font_dir * pdir, const gs_font * pfont,
		   const gs_matrix * pmat, gs_font ** ppfont)
{
    return gs_type0_adjust_matrix(pdir, (gs_font_type0 *) * ppfont, pmat);
}
