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[tfm] Define the `tfm_interface' functions.

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* src/tfm/tfmobjs.c: Do it.
GSoC-2018-parth
Parth Wazurkar 7 years ago
parent 4b9c1b2b1b
commit 7939499452
3 changed files with 470 additions and 0 deletions
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  1. 25
      src/tfm/tfm.c
  2. 389
      src/tfm/tfmobjs.c
  3. 56
      src/tfm/tfmobjs.h

25
src/tfm/tfm.c
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/****************************************************************************
*
* tfm.c
*
* FreeType auxiliary TFM module.
*
* Copyright 1996-2018 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* This file is part of the FreeType project, and may only be used,
* modified, and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify, or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
*/
#define FT_MAKE_OPTION_SINGLE_OBJECT
#include <ft2build.h>
#include "tfmmod.c"
/* END */

389
src/tfm/tfmobjs.c
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/****************************************************************************
*
* tfmobjs.c
*
* FreeType auxiliary TFM module.
*
* Copyright 1996-2018 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* This file is part of the FreeType project, and may only be used,
* modified, and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify, or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
*/
#include <ft2build.h>
#include "tfmobjs.h"
#include "tfmmod.h"
#include FT_INTERNAL_STREAM_H
#include "tfmerrors.h"
/**************************************************************************
*
* The macro FT_COMPONENT is used in trace mode. It is an implicit
* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log
* messages during execution.
*/
#undef FT_COMPONENT
#define FT_COMPONENT trace_tfmobjs
/**************************************************************************
*
* TFM font utility functions.
*
*/
long tfm_read_intn(FT_Stream,int);
unsigned long tfm_read_uintn(FT_Stream,int);
#define READ_UINT2( stream ) (UINT1)tfm_read_uintn( stream, 2)
#define READ_UINT4( stream ) (UINT1)tfm_read_uintn( stream, 4)
#define READ_INT4( stream ) (INT4)tfm_read_intn( stream, 4)
/*
* Reading a Number from file
*/
unsigned long
tfm_read_uintn(FT_Stream stream, int size)
{
unsigned long v,k;
FT_Error error = FT_Err_Ok;
FT_Byte tp;
v = 0L;
while (size >= 1)
{
if ( FT_READ_BYTE(tp) )
return 0; /* To be changed */
k =(unsigned long)tp;
v = v*256L + k;
--size;
}
return v;
}
long
tfm_read_intn(FT_Stream stream, int size)
{
long v;
FT_Byte tp;
FT_Error error= FT_Err_Ok;
unsigned long z ;
if ( FT_READ_BYTE(tp) )
return 0; /* To be changed */
z= (unsigned long)tp;
v = (long)z & 0xffL;
if (v & 0x80L)
v = v - 256L;
--size;
while (size >= 1)
{
if ( FT_READ_BYTE(tp) )
return 0; /* To be changed */
z= (unsigned long)tp;
v = v*256L + z;
--size;
}
return v;
}
/**************************************************************************
*
* API.
*
*/
FT_LOCAL_DEF( FT_Error )
tfm_init( TFM_Parser parser,
FT_Memory memory,
FT_Stream stream )
{
FT_Error error;
parser->memory = memory;
parser->stream = stream;
parser->FontInfo = NULL;
parser->user_data = NULL;
return FT_Err_Ok;
}
FT_LOCAL( void )
tfm_close( TFM_Parser parser )
{
FT_Memory memory = parser->memory;
FT_FREE( parser->stream );
}
FT_LOCAL_DEF( FT_Error )
tfm_parse_metrics( TFM_Parser parser )
{
FT_Memory memory = parser->memory;
TFM_FontInfo fi = parser->FontInfo;
FT_Error error = FT_ERR( Syntax_Error );
FT_ULong lf, lh, nc, nci, err;
FT_ULong offset_header, offset_char_info, offset_param;
FT_ULong nw, nh, nd, ni, nl, nk, neng, np, dir;
FT_Long *w, *h, *d;
FT_ULong *ci, v;
FT_ULong i;
FT_Long bbxw, bbxh, xoff, yoff;
if ( !fi )
return FT_THROW( Invalid_Argument );
fi->width = NULL;
fi->height = NULL;
fi->depth = NULL;
fi->font_bbx_w = 0.0;
fi->font_bbx_h = 0.0;
fi->font_bbx_xoff = 0.0;
fi->font_bbx_yoff = 0.0;
err = 0;
/* rewind(fp); */
if( FT_STREAM_SEEK( 0 ) )
return error;
lf = (UINT4)READ_UINT2( stream );
#if 0
if ((lf == 11) || (lf == 9))
{
/* JFM file of Japanese TeX by ASCII Coop. */
tfm->type = METRIC_TYPE_JFM;
tfm->type_aux = (lf == 11)?METRIC_TYPE_JFM_AUX_H:METRIC_TYPE_JFM_AUX_V;
tfm->nt = (UINT4)READ_UINT2(fp);
lf = (UINT4)READ_UINT2(fp);
lh = (UINT4)READ_UINT2(fp);
offset_header = 4*7;
offset_char_info = 4*(7+tfm->nt+lh);
}
else if (lf == 0)
{
/* Omega Metric File */
tfm->type = METRIC_TYPE_OFM;
tfm->type_aux = READ_INT2(fp); /* ofm_level */
if ((tfm->type_aux < 0) || (1 < tfm->type_aux))
tfm->type_aux = 0; /* broken, maybe */
lf = READ_UINT4(fp);
lh = READ_UINT4(fp);
if (tfm->type_aux == 0)
{ /* level 0 OFM */
offset_header = 4*14;
offset_char_info = 4*(14+lh);
}
else
{ /* level 1 OFM: *** NOT SUPPORTED YET *** */
offset_header = 4*29;
offset_char_info = 4*(29+lh);
}
}
else
{ }
#endif
/* Traditional TeX Metric File */
lh = (int)READ_UINT2( stream );
offset_header = 4*6;
offset_char_info = 4*(6+lh);
#if 0
if (tfm->type == METRIC_TYPE_OFM)
{
tfm->begin_char = READ_UINT4(fp);
tfm->end_char = READ_UINT4(fp);
nw = READ_UINT4(fp);
nh = READ_UINT4(fp);
nd = READ_UINT4(fp);
ni = READ_UINT4(fp);
nl = READ_UINT4(fp);
nk = READ_UINT4(fp);
neng = READ_UINT4(fp);
np = READ_UINT4(fp);
dir = READ_UINT4(fp);
if (((signed)(tfm->begin_char-1) > (signed)tfm->end_char) ||
(tfm->end_char > 65535))
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
}
else
{ }
#endif
fi->begin_char = (int)READ_UINT2( stream );
fi->end_char = (int)READ_UINT2( stream );
nw = (UINT4)READ_UINT2( stream );
nh = (UINT4)READ_UINT2( stream );
nd = (UINT4)READ_UINT2( stream );
ni = (UINT4)READ_UINT2( stream );
nl = (UINT4)READ_UINT2( stream );
nk = (UINT4)READ_UINT2( stream );
neng = (UINT4)READ_UINT2( stream );
np = (UINT4)READ_UINT2( stream );
#if 0
if (tfm->type == METRIC_TYPE_TFM)
{}
#endif
if (((signed)(fi->begin_char-1) > (signed)fi->end_char) ||
(fi->end_char > 255))
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
/* fseek(fp, offset_header, SEEK_SET); */
if (FT_STREAM_SEEK( offset_header ) )
goto Exit;
fi->cs = READ_UINT4( stream );
fi->ds = READ_UINT4( stream );
fi->design_size = (double)(fi->ds)/(double)(1<<20);
nc = fi->end_char - fi->begin_char + 1;
nci = nc;
#if 0
if (tfm->type == METRIC_TYPE_OFM)
nci *= 2;
#endif
ci = (UINT4*)calloc(nci, sizeof(UINT4));
w = (INT4*)calloc(nw, sizeof(UINT4));
h = (INT4*)calloc(nh, sizeof(UINT4));
d = (INT4*)calloc(nd, sizeof(UINT4));
if ((ci == NULL) || (w == NULL) || (h == NULL) || (d == NULL))
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
/* fseek(fp, offset_char_info, SEEK_SET); */
if( FT_STREAM_SEEK( offset_char_info ) )
goto Exit;
for (i = 0; i < nci; i++)
ci[i] = READ_UINT4( stream );
/* offset_param = ftell(fp) + 4*(nw + nh + nd + ni + nl + nk + neng); */
offset_param = stream->pos + 4*(nw + nh + nd + ni + nl + nk + neng);
for (i = 0; i < nw; i++)
w[i] = READ_INT4( stream );
for (i = 0; i < nh; i++)
h[i] = READ_INT4( stream );
for (i = 0; i < nd; i++)
d[i] = READ_INT4( stream );
fi->width = (INT4*)calloc(nc, sizeof(INT4));
fi->height = (INT4*)calloc(nc, sizeof(INT4));
fi->depth = (INT4*)calloc(nc, sizeof(INT4));
if ((fi->width == NULL) || (fi->height == NULL) || (fi->depth == NULL))
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
bbxw = 0;
bbxh = 0;
xoff = 0;
yoff = 0;
#if 0
if (tfm->type == METRIC_TYPE_OFM)
{
for (i = 0; i < nc; i++)
{
v = ci[2*i];
tfm->depth[i] = d[v & 0xff]; v >>= 8;
tfm->height[i] = h[v & 0xff]; v >>= 8;
tfm->width[i] = w[v & 0xffff];
if (bbxw < tfm->width[i])
bbxw = tfm->width[i];
if (bbxh < (tfm->height[i] + tfm->depth[i]))
bbxh = tfm->height[i] + tfm->depth[i];
if (yoff > -tfm->depth[i])
yoff = -tfm->depth[i];
#if 0
printf("** %.3f %.3f %.3f\n",
(double)tfm->width[i]/(double)(1<<20),
(double)tfm->height[i]/(double)(1<<20),
(double)tfm->depth[i]/(double)(1<<20));
#endif
}
}
else
{ }
#endif
for (i = 0; i < nc; i++)
{
v = ci[i] / 0x10000L;
fi->depth[i] = d[v & 0xf]; v >>= 4;
fi->height[i] = h[v & 0xf]; v >>= 4;
fi->width[i] = w[v & 0xff];
if (bbxw < fi->width[i])
bbxw = fi->width[i];
if (bbxh < (fi->height[i] + fi->depth[i]))
bbxh = fi->height[i] + fi->depth[i];
if (yoff > -fi->depth[i])
yoff = -fi->depth[i];
#if 0
printf("** %.3f %.3f\n",
(double)tfm->height[i]/(double)(1<<20),
(double)tfm->depth[i]/(double)(1<<20));
#endif
}
fi->font_bbx_w = fi->design_size * ((double)bbxw / (double)(1<<20));
fi->font_bbx_h = fi->design_size * ((double)bbxh / (double)(1<<20));
fi->font_bbx_xoff = fi->design_size * ((double)xoff / (double)(1<<20));
fi->font_bbx_yoff = fi->design_size * ((double)yoff / (double)(1<<20));
#if 0
if (tfm->type == METRIC_TYPE_JFM)
{
fseek(fp, 4*(7+lh), SEEK_SET);
tfm->ct_kcode = (unsigned int*)calloc(tfm->nt+1, sizeof(unsigned int));
tfm->ct_ctype = (unsigned int*)calloc(tfm->nt+1, sizeof(unsigned int));
if ((tfm->ct_kcode == NULL) || (tfm->ct_ctype == NULL))
{
error = FT_THROW( Invalid_Argument );
goto Exit;
}
for (i = 0; i < tfm->nt; i++)
{
v = READ_UINT4(fp);
tfm->ct_kcode[i] = v/0x10000L;
tfm->ct_ctype[i] = v%0x10000L;
}
tfm->ct_kcode[tfm->nt] = 0; /* sentinel */
tfm->ct_ctype[tfm->nt] = 0;
}
#endif
/* fseek(fp, offset_param, SEEK_SET); */
if( FT_STREAM_SEEK( offset_param ) )
return error; /* To be changed */
if (FT_READ_ULONG(fi->slant) )
return error;
fi->slant = (double)fi->slant/(double)(1<<20);
Exit:
FT_FREE(ci);
FT_FREE(w);
FT_FREE(h);
FT_FREE(d);
return error;
}
/* END */

56
src/tfm/tfmobjs.h
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/****************************************************************************
*
* tfmobjs.h
*
* FreeType auxiliary TFM module.
*
* Copyright 1996-2018 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* This file is part of the FreeType project, and may only be used,
* modified, and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify, or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
*/
#ifndef TFMOBJS_H_
#define TFMOBJS_H_
#include <ft2build.h>
#include "tfmmod.h"
FT_BEGIN_HEADER
#include <ft2build.h>
#include FT_INTERNAL_TFM_H
FT_BEGIN_HEADER
/* Initialise the TFM stream */
FT_LOCAL( FT_Error )
tfm_init( TFM_Parser parser,
FT_Memory memory
FT_Stream stream );
/* Parse TFM metric data */
FT_LOCAL( FT_Error )
tfm_parse_metrics( TFM_Parser parser );
FT_LOCAL( FT_Error )
tfm_parse_kerns( TFM_Parser parser );
FT_LOCAL( void )
tfm_close( TFM_Parser parser );
FT_END_HEADER
#endif /* TFMOBJS_H_ */
/* END */
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