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/*************************************************************************
* Copyright (c) 2011 AT&T Intellectual Property
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-v10.html
*
* Contributors: Details at https://graphviz.org
*************************************************************************/
#include "config.h"
#include "gd_psfontResolve.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gvc/gvplugin_textlayout.h>
#include <gd.h>
#include <common/const.h>
#include <util/agxbuf.h>
#include <util/strcasecmp.h>
#include <util/strview.h>
#ifdef HAVE_GD_FREETYPE
/* fontsize at which text is omitted entirely */
#define FONTSIZE_MUCH_TOO_SMALL 0.15
/* fontsize at which text is rendered by a simple line */
#define FONTSIZE_TOO_SMALL 1.5
#ifndef HAVE_GD_FONTCONFIG
/* gd_alternate_fontlist;
* Sometimes fonts are stored under a different name,
* especially on Windows. Without fontconfig, we provide
* here some rudimentary name mapping.
*/
char *gd_alternate_fontlist(const char *font) {
char *p;
/* fontbuf to contain font without style descriptions like -Roman or -Italic */
strview_t fontlist = strview(font, '\0');
if ((p = strchr(font, '-')) || (p = strchr(font, '_')))
fontlist.size = (size_t)(p - font);
if (strcasecmp(font, "times-bold") == 0
|| strview_case_str_eq(fontlist, "timesbd")
|| strview_case_str_eq(fontlist, "timesb"))
fontlist = strview("timesbd;Timesbd;TIMESBD;timesb;Timesb;TIMESB", '\0');
else if (strcasecmp(font, "times-italic") == 0
|| strview_case_str_eq(fontlist, "timesi"))
fontlist = strview("timesi;Timesi;TIMESI", '\0');
else if (strcasecmp(font, "timesnewroman") == 0
|| strcasecmp(font, "timesnew") == 0
|| strcasecmp(font, "timesroman") == 0
|| strview_case_str_eq(fontlist, "times"))
fontlist = strview("times;Times;TIMES", '\0');
else if (strcasecmp(font, "arial-bold") == 0
|| strview_case_str_eq(fontlist, "arialb"))
fontlist = strview("arialb;Arialb;ARIALB", '\0');
else if (strcasecmp(font, "arial-italic") == 0
|| strview_case_str_eq(fontlist, "ariali"))
fontlist = strview("ariali;Ariali;ARIALI", '\0');
else if (strview_case_str_eq(fontlist, "helvetica"))
fontlist = strview("helvetica;Helvetica;HELVETICA;arial;Arial;ARIAL", '\0');
else if (strview_case_str_eq(fontlist, "arial"))
fontlist = strview("arial;Arial;ARIAL", '\0');
else if (strview_case_str_eq(fontlist, "courier"))
fontlist = strview("courier;Courier;COURIER;cour", '\0');
return strview_str(fontlist);
}
#endif /* HAVE_GD_FONTCONFIG */
/// construct alias for postscript fontname
char* gd_psfontResolve (PostscriptAlias* pa)
{
agxbuf buf = {0};
agxbput(&buf, pa->family);
const char *separator = " ";
const char *const attributes[] = {pa->weight, pa->stretch, pa->style};
for (size_t i = 0; i < sizeof(attributes) / sizeof(attributes[0]); ++i) {
const char *const a = attributes[i];
if (a != NULL) {
agxbprint(&buf, "%s%s", separator, a);
separator = ", ";
}
}
return agxbdisown(&buf);
}
static bool gd_textlayout(textspan_t * span, char **fontpath)
{
char *err, *fontlist, *fontname;
double fontsize;
int brect[8];
gdFTStringExtra strex;
#ifdef HAVE_GD_FONTCONFIG
PostscriptAlias *pA;
#endif
fontname = span->font->name;
fontsize = span->font->size;
strex.fontpath = NULL;
strex.flags = gdFTEX_RETURNFONTPATHNAME | gdFTEX_RESOLUTION;
strex.hdpi = strex.vdpi = POINTS_PER_INCH;
if (strchr(fontname, '/'))
strex.flags |= gdFTEX_FONTPATHNAME;
else
strex.flags |= gdFTEX_FONTCONFIG;
span->size.x = 0.0;
span->size.y = 0.0;
span->yoffset_layout = 0.0;
span->layout = NULL;
span->free_layout = NULL;
span->yoffset_centerline = 0.05 * fontsize;
if (fontname) {
if (fontsize <= FONTSIZE_MUCH_TOO_SMALL) {
return true; /* OK, but ignore text entirely */
} else if (fontsize <= FONTSIZE_TOO_SMALL) {
/* draw line in place of text */
/* fake a finite fontsize so that line length is calculated */
fontsize = FONTSIZE_TOO_SMALL;
}
/* call gdImageStringFT with null *im to get brect and to set font cache */
bool fontlist_needs_free = false;
#ifdef HAVE_GD_FONTCONFIG
gdFTUseFontConfig(1); /* tell gd that we really want to use fontconfig, 'cos it s not the default */
pA = span->font->postscript_alias;
if (pA)
fontlist = gd_psfontResolve (pA);
else
fontlist = fontname;
#else
fontlist = gd_alternate_fontlist(fontname);
fontlist_needs_free = true;
#endif
err = gdImageStringFTEx(NULL, brect, -1, fontlist,
fontsize, 0, 0, 0, span->str, &strex);
if (fontlist_needs_free) {
free(fontlist);
}
if (err) {
agerrorf("%s\n", err);
return false; /* indicate error */
}
if (fontpath)
*fontpath = strex.fontpath;
else
free (strex.fontpath); /* strup'ed in libgd */
if (span->str && span->str[0]) {
/* can't use brect on some archtectures if strlen 0 */
span->size.x = (double) (brect[4] - brect[0]);
// LINESPACING specifies how much extra space to leave between lines
span->size.y = fontsize * LINESPACING;
}
}
return true;
}
static gvtextlayout_engine_t gd_textlayout_engine = {
gd_textlayout,
};
#endif
gvplugin_installed_t gvtextlayout_gd_types[] = {
#ifdef HAVE_GD_FREETYPE
{0, "textlayout", 2, &gd_textlayout_engine, NULL},
#endif
{0, NULL, 0, NULL, NULL}
};
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