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/*
# fontdimen.c: handle TFM fontdimens a.k.a. font parameters.
#
# Copyright (C) 1992, 2011 Free Software Foundation, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
*/
#include "config.h"
#include "tfm.h"
/* This structure maps font parameter names to numbers. */
typedef struct
{
string name;
unsigned number;
} font_param_type;
/* The list of fontdimen names and their corresponding numbers. I wish
I could figure out a good way to give this list only once (in tfm.h),
instead of three times. */
static font_param_type font_param[] = {
{ "slant", TFM_SLANT_PARAMETER },
{ "space", TFM_SPACE_PARAMETER },
{ "stretch", TFM_STRETCH_PARAMETER },
{ "shrink", TFM_SHRINK_PARAMETER },
{ "xheight", TFM_XHEIGHT_PARAMETER },
{ "quad", TFM_QUAD_PARAMETER },
{ "extraspace", TFM_EXTRASPACE_PARAMETER },
{ "num1", TFM_NUM1_PARAMETER },
{ "num2", TFM_NUM2_PARAMETER },
{ "num3", TFM_NUM3_PARAMETER },
{ "denom1", TFM_DENOM1_PARAMETER },
{ "denom2", TFM_DENOM2_PARAMETER },
{ "sup1", TFM_SUP1_PARAMETER },
{ "sup2", TFM_SUP2_PARAMETER },
{ "sup3", TFM_SUP3_PARAMETER },
{ "sub1", TFM_SUB1_PARAMETER },
{ "sub2", TFM_SUB2_PARAMETER },
{ "supdrop", TFM_SUPDROP_PARAMETER },
{ "subdrop", TFM_SUBDROP_PARAMETER },
{ "delim1", TFM_DELIM1_PARAMETER },
{ "delim2", TFM_DELIM2_PARAMETER },
{ "axisheight", TFM_AXISHEIGHT_PARAMETER },
{ "defaultrulethickness", TFM_DEFAULTRULETHICKNESS_PARAMETER },
{ "bigopspacing1", TFM_BIGOPSPACING1_PARAMETER },
{ "bigopspacing2", TFM_BIGOPSPACING2_PARAMETER },
{ "bigopspacing3", TFM_BIGOPSPACING3_PARAMETER },
{ "bigopspacing4", TFM_BIGOPSPACING4_PARAMETER },
{ "bigopspacing5", TFM_BIGOPSPACING5_PARAMETER },
{ "leadingheight", TFM_LEADINGHEIGHT_PARAMETER },
{ "leadingdepth", TFM_LEADINGDEPTH_PARAMETER },
{ "fontsize", TFM_FONTSIZE_PARAMETER },
{ "version", TFM_VERSION_PARAMETER },
};
/* Set the font parameter entries in TFM_INFO according to the string S.
If S is non-null and non-empty, it should look like
<fontdimen>:<real>,<fontdimen>:<real>,..., where each <fontdimen> is
either a standard name or a number between 1 and 30 (the 30 comes
from the default value in PLtoTF, it's not critical).
Also, if the `design_size' member of TFM_INFO is nonzero, we set the
`FONTSIZE' parameter to 1.0 (meaning it's equal to the design size),
unless the `FONTSIZE' parameter is already set. */
void
tfm_set_fontdimens (string s, tfm_global_info_type *tfm_info)
{
string spec;
/* If S is empty, we have nothing more to do. */
if (s == NULL || *s == 0)
return;
/* Parse the specification string. */
for (spec = strtok (s, ","); spec != NULL; spec = strtok (NULL, ","))
{
string fontdimen;
real value;
unsigned param_number = 0;
string value_string = strchr (spec, ':');
if (value_string == NULL || !float_ok (value_string))
FATAL1 ("Fontdimens look like `<fontdimen>:<real>', not `%s'",
spec);
value = atof (value_string + 1);
fontdimen = substring (spec, 0, value_string - spec - 1);
/* If `fontdimen' is all numerals, we'll take it to be an integer. */
if (strspn (fontdimen, "0123456789") == strlen (fontdimen))
{
param_number = atou (fontdimen);
if (param_number == 0 || param_number > TFM_MAX_FONT_PARAMETERS)
FATAL2 ("Font parameter %u is not between 1 and the maximum (%u)",
param_number, TFM_MAX_FONT_PARAMETERS);
}
else
{ /* It wasn't a number; see if it's a valid name. */
param_number = tfm_fontdimen_number (fontdimen);
if (param_number == 0)
FATAL1 ("I don't know the font parameter name `%s'", fontdimen);
}
/* If we got here, `param_number' is the number of the font
parameter we are supposed to assign to. */
tfm_set_font_parameter (param_number, value, tfm_info);
/* If `param_number' is past the last fontdimen previously
assigned, we have to assign zero to all the intervening ones.
But this can never happen, because we always assign the
`fontsize' parameter, which happens to be the last one. */
assert (param_number <= TFM_FONT_PARAMETER_COUNT (*tfm_info));
}
}
/* Return zero if we do not recognize S as the name of a fontdimen, else
its corresponding number. We just do a linear search through the
structure, since it's so small. */
unsigned
tfm_fontdimen_number (string s)
{
unsigned this_param;
unsigned param_number = 0;
for (this_param = 0;
this_param < TFM_MAX_FONT_PARAMETERS && param_number == 0;
this_param++)
if (STREQ (s, font_param[this_param].name))
param_number = font_param[this_param].number;
return param_number;
}
/* Set the PARAMETER-th font parameter of TFM_INFO to VALUE. If
PARAMETER is beyond the current last parameter of TFM_INFO, set
all the intervening parameters to zero. */
void
tfm_set_fontdimen (tfm_global_info_type *tfm_info,
unsigned parameter, real value,
{
if (TFM_FONT_PARAMETER_COUNT (*tfm_info) < parameter)
{
unsigned p;
for (p = TFM_FONT_PARAMETER_COUNT (*tfm_info) + 1; p < parameter; p++)
TFM_FONT_PARAMETER (*tfm_info, p) = 0.0;
/* Now we have more parameters. */
TFM_FONT_PARAMETER_COUNT (*tfm_info) = parameter;
}
TFM_FONT_PARAMETER (*tfm_info, parameter) = value;
}
/* Set the `FONTSIZE' parameter of TFM_INFO, if the design size is set. */
void
tfm_set_fontsize (tfm_global_info_type *tfm_info)
{
if (TFM_DESIGN_SIZE (*tfm_info) != 0.0)
tfm_set_font_parameter (TFM_FONTSIZE_PARAMETER,
TFM_DESIGN_SIZE (*tfm_info), tfm_info);
}
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