harvey/sys/src/cmd/gs/src/gsfont0.c

/* Copyright (C) 1994, 1996, 1997, 1999 Aladdin Enterprises.  All rights reserved.
  
  This file is part of AFPL Ghostscript.
  
  AFPL 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 Free Public License (the
  "License") for full details.
  
  Every copy of AFPL 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 AFPL 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.
*/

/*$Id: gsfont0.c,v 1.2 2000/09/19 19:00:28 lpd Exp $ */
/* 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);
}