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/* $Id$ $Revision$ */
/* vim:set shiftwidth=4 ts=8: */
/*************************************************************************
* 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
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors: See CVS logs. Details at http://www.graphviz.org/
*************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "gvplugin_textlayout.h"
#ifdef HAVE_LIBGD
#include "gd.h"
#if defined(HAVE_LIBGD) && defined(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(char *font)
{
static char *fontbuf;
static int fontbufsz;
char *p, *fontlist;
int len;
len = strlen(font) + 1;
if (len > fontbufsz) {
fontbufsz = 2 * len;
if (fontbuf == NULL)
fontbuf = malloc(fontbufsz);
else
fontbuf = realloc(fontbuf, fontbufsz);
}
/* fontbuf to contain font without style descriptions like -Roman or -Italic */
strcpy(fontbuf, font);
if ((p = strchr(fontbuf, '-')) || (p = strchr(fontbuf, '_')))
*p = 0;
fontlist = fontbuf;
if ((strcasecmp(font, "times-bold") == 0)
|| (strcasecmp(fontbuf, "timesbd") == 0)
|| (strcasecmp(fontbuf, "timesb") == 0))
fontlist = "timesbd;Timesbd;TIMESBD;timesb;Timesb;TIMESB";
else if ((strcasecmp(font, "times-italic") == 0)
|| (strcasecmp(fontbuf, "timesi") == 0))
fontlist = "timesi;Timesi;TIMESI";
else if ((strcasecmp(font, "timesnewroman") == 0)
|| (strcasecmp(font, "timesnew") == 0)
|| (strcasecmp(font, "timesroman") == 0)
|| (strcasecmp(fontbuf, "times") == 0))
fontlist = "times;Times;TIMES";
else if ((strcasecmp(font, "arial-bold") == 0)
|| (strcasecmp(fontbuf, "arialb") == 0))
fontlist = "arialb;Arialb;ARIALB";
else if ((strcasecmp(font, "arial-italic") == 0)
|| (strcasecmp(fontbuf, "ariali") == 0))
fontlist = "ariali;Ariali;ARIALI";
else if (strcasecmp(fontbuf, "helvetica") == 0)
fontlist = "helvetica;Helvetica;HELVETICA;arial;Arial;ARIAL";
else if (strcasecmp(fontbuf, "arial") == 0)
fontlist = "arial;Arial;ARIAL";
else if (strcasecmp(fontbuf, "courier") == 0)
fontlist = "courier;Courier;COURIER;cour";
return fontlist;
}
#endif /* HAVE_GD_FONTCONFIG */
/* gd_psfontResolve:
* * Construct alias for postscript fontname.
* * NB. Uses a static array - non-reentrant.
* */
#define ADD_ATTR(a) \
if (a) { \
strcat(buf, comma ? " " : ", "); \
comma = 1; \
strcat(buf, a); \
}
char* gd_psfontResolve (PostscriptAlias* pa)
{
static char buf[1024];
int comma=0;
strcpy(buf, pa->family);
ADD_ATTR(pa->weight);
ADD_ATTR(pa->stretch);
ADD_ATTR(pa->style);
return buf;
}
static boolean gd_textlayout(textspan_t * span, char **fontpath)
{
char *err, *fontlist, *fontname;
double fontsize;
int brect[8];
gdFTStringExtra strex;
PostscriptAlias *pA;
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 (strstr(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 = 0.1 * 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 */
#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);
#endif
err = gdImageStringFTEx(NULL, brect, -1, fontlist,
fontsize, 0, 0, 0, span->str, &strex);
if (err) {
agerr(AGERR,"%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]);
/* 1.2 specifies how much extra space to leave between lines;
* see LINESPACING in const.h.
*/
span->size.y = (int)(fontsize * 1.2);
}
}
return TRUE;
}
static gvtextlayout_engine_t gd_textlayout_engine = {
gd_textlayout,
};
#endif
#endif
gvplugin_installed_t gvtextlayout_gd_types[] = {
#if defined(HAVE_LIBGD) && defined(HAVE_GD_FREETYPE)
{0, "textlayout", 2, &gd_textlayout_engine, NULL},
#endif
{0, NULL, 0, NULL, NULL}
};
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