inicial

1 files changed, 495 insertions, 0 deletions

diff --git a/backend/dvi/mdvi-lib/tt.c b/backend/dvi/mdvi-lib/tt.c
new file mode 100644
index 00000000..e85d8e70
--- /dev/null
+++ b/backend/dvi/mdvi-lib/tt.c
@@ -0,0 +1,495 @@
+/*
+ * Copyright (C) 2000, Matias Atria
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <config.h>
+#include "mdvi.h"
+
+#ifdef WITH_TRUETYPE_FONTS
+
+#include <string.h>
+#include <freetype.h>
+#include <ftxpost.h>
+#include <ftxerr18.h>
+
+#include "private.h"
+
+static TT_Engine tt_handle;
+static int initialized = 0;
+
+typedef struct ftinfo {
+	struct ftinfo *next;
+	struct ftinfo *prev;
+	char	*fontname;
+	char	*fmfname;
+	TT_Face	face;
+	TT_Instance	instance;
+	TT_Glyph	glyph;
+	int	hasmetrics;
+	int	loaded;
+	int	fmftype;
+	TFMInfo *tfminfo;
+	DviFontMapInfo mapinfo;
+	DviEncoding	*encoding;
+} FTInfo;
+
+static int tt_load_font __PROTO((DviParams *, DviFont *));
+static int tt_font_get_glyph __PROTO((DviParams *, DviFont *, int));
+static void tt_free_data __PROTO((DviFont *));
+static void tt_reset_font __PROTO((DviFont *));
+static void tt_shrink_glyph 
+	__PROTO((DviContext *, DviFont *, DviFontChar *, DviGlyph *));
+static void tt_font_remove __PROTO((FTInfo *));
+
+DviFontInfo tt_font_info = {
+	"TT",
+	0,
+	tt_load_font,
+	tt_font_get_glyph,
+	tt_shrink_glyph,
+	mdvi_shrink_glyph_grey,
+	tt_free_data,	/* free */
+	tt_reset_font,	/* reset */
+	NULL,	/* lookup */
+	kpse_truetype_format,
+	NULL
+};
+
+#define FT_HASH_SIZE	31
+
+static ListHead	ttfonts = {NULL, NULL, 0};
+
+static int init_freetype(void)
+{
+	TT_Error code;
+
+	ASSERT(initialized == 0);
+	code = TT_Init_FreeType(&tt_handle);
+	if(code) {
+		DEBUG((DBG_TT, "(tt) Init_Freetype: error %d\n", code));
+		return -1;
+	}
+	code = TT_Init_Post_Extension(tt_handle);
+	if(code) {
+		TT_Done_FreeType(tt_handle);
+		return -1;
+	}
+	/* we're on */
+	initialized = 1;
+	return 0;
+}
+
+static void tt_encode_font(DviFont *font, FTInfo *info)
+{
+	TT_Face_Properties prop;
+	int	i;
+	
+	if(TT_Get_Face_Properties(info->face, &prop))
+		return;
+	
+	for(i = 0; i < prop.num_Glyphs; i++) {
+		char	*string;
+		int	ndx;
+		
+		if(TT_Get_PS_Name(info->face, i, &string))
+			continue;
+		ndx = mdvi_encode_glyph(info->encoding, string);
+		if(ndx < font->loc || ndx > font->hic)
+			continue;
+		font->chars[ndx - font->loc].code = i;
+	}
+}
+
+static int tt_really_load_font(DviParams *params, DviFont *font, FTInfo *info)
+{
+	DviFontChar *ch;
+	TFMChar *ptr;
+	Int32	z, alpha, beta;
+	int	i;
+	FTInfo	*old;
+	TT_Error status;
+	double	point_size;
+	static int warned = 0;
+	TT_CharMap cmap;
+	TT_Face_Properties props;
+	int	map_found;
+			
+	DEBUG((DBG_TT, "(tt) really_load_font(%s)\n", info->fontname));
+	
+	/* get the point size */
+	point_size = (double)font->scale / (params->tfm_conv * 0x100000);
+	point_size = 72.0 * point_size / 72.27;
+	if(info->loaded) {
+		/* just reset the size info */
+		TT_Set_Instance_Resolutions(info->instance,
+			params->dpi, params->vdpi);
+		TT_Set_Instance_CharSize(info->instance, FROUND(point_size * 64));
+		/* FIXME: should extend/slant again */
+		info->hasmetrics = 1;
+		return 0;
+	}
+	
+	/* load the face */
+	DEBUG((DBG_TT, "(tt) loading new face `%s'\n",
+		info->fontname));
+	status = TT_Open_Face(tt_handle, font->filename, &info->face);
+	if(status) {
+		mdvi_warning(_("(tt) %s: could not load face: %s\n"),
+			info->fontname, TT_ErrToString18(status));
+		return -1;
+	}
+	
+	/* create a new instance of this face */
+	status = TT_New_Instance(info->face, &info->instance);
+	if(status) {
+		mdvi_warning(_("(tt) %s: could not create face: %s\n"), 
+			info->fontname, TT_ErrToString18(status));
+		TT_Close_Face(info->face);
+		return -1;
+	}
+
+	/* create a glyph */
+	status = TT_New_Glyph(info->face, &info->glyph);
+	if(status) {
+		mdvi_warning(_("(tt) %s: could not create glyph: %s\n"), 
+			info->fontname, TT_ErrToString18(status));
+		goto tt_error;
+	}
+
+	/* 
+	 * We'll try to find a Unicode charmap. It's not that important that we
+	 * actually find one, especially if the fontmap files are installed
+	 * properly, but it's good to have some predefined behaviour
+	 */
+	TT_Get_Face_Properties(info->face, &props);
+
+	map_found = -1;
+	for(i = 0; map_found < 0 && i < props.num_CharMaps; i++) {
+		TT_UShort	pid, eid;
+		
+		TT_Get_CharMap_ID(info->face, i, &pid, &eid);
+		switch(pid) {
+		case TT_PLATFORM_APPLE_UNICODE:
+			map_found = i;
+			break;
+		case TT_PLATFORM_ISO:
+			if(eid == TT_ISO_ID_7BIT_ASCII || 
+			   eid == TT_ISO_ID_8859_1)
+			   	map_found = 1;
+			break;
+		case TT_PLATFORM_MICROSOFT:
+			if(eid == TT_MS_ID_UNICODE_CS)
+				map_found = 1;
+			break;
+		}
+	}
+	if(map_found < 0) {
+		mdvi_warning(_("(tt) %s: no acceptable map found, using #0\n"),
+			info->fontname);
+		map_found = 0;
+	}
+	DEBUG((DBG_TT, "(tt) %s: using charmap #%d\n",
+		info->fontname, map_found));
+	TT_Get_CharMap(info->face, map_found, &cmap);
+		
+	DEBUG((DBG_TT, "(tt) %s: Set_Char_Size(%.2f, %d, %d)\n",
+		font->fontname, point_size, font->hdpi, font->vdpi));
+	status = TT_Set_Instance_Resolutions(info->instance,
+			params->dpi, params->vdpi);
+	if(status) {
+		error(_("(tt) %s: could not set resolution: %s\n"),
+			info->fontname, TT_ErrToString18(status));
+		goto tt_error;
+	}
+	status = TT_Set_Instance_CharSize(info->instance, 
+			FROUND(point_size * 64));
+	if(status) {
+		error(_("(tt) %s: could not set point size: %s\n"),
+			info->fontname, TT_ErrToString18(status));
+		goto tt_error;
+	}
+
+	/* after this point we don't fail */
+
+	/* get information from the fontmap */
+	status = mdvi_query_fontmap(&info->mapinfo, info->fontname);
+	if(!status && info->mapinfo.encoding)
+		info->encoding = mdvi_request_encoding(info->mapinfo.encoding);
+	else
+		info->encoding = NULL;
+
+	if(info->encoding != NULL) {
+		TT_Post	post;
+		
+		status = TT_Load_PS_Names(info->face, &post);
+		if(status) {
+			mdvi_warning(_("(tt) %s: could not load PS name table\n"),
+				info->fontname);
+			mdvi_release_encoding(info->encoding, 0);
+			info->encoding = NULL;
+		}
+	}
+
+	/* get the metrics. If this fails, it's not fatal, but certainly bad */
+	info->tfminfo = get_font_metrics(info->fontname, 
+		info->fmftype, info->fmfname);
+
+	if(info->tfminfo == NULL) {
+		mdvi_warning("(tt) %s: no metrics data, font ignored\n",
+			info->fontname);
+		goto tt_error;
+	}
+	/* fix this */
+	font->design = info->tfminfo->design;
+
+	/* get the scaled character metrics */
+	get_tfm_chars(params, font, info->tfminfo, 0);
+
+	if(info->encoding)
+		tt_encode_font(font, info);
+	else {
+		mdvi_warning(_("%s: no encoding vector found, expect bad output\n"),
+			info->fontname);
+		/* this is better than nothing */
+		for(i = font->loc; i <= font->hic; i++)
+			font->chars[i - font->loc].code = TT_Char_Index(cmap, i);
+	}
+
+	info->loaded = 1;	
+	info->hasmetrics = 1;
+	return 0;
+
+tt_error:
+	tt_font_remove(info);
+	mdvi_free(font->chars);
+	font->chars = NULL;
+	font->loc = font->hic = 0;
+	return -1;
+}
+
+static int tt_load_font(DviParams *params, DviFont *font)
+{
+	int	i;
+	FTInfo	*info;
+	
+	if(!initialized && init_freetype() < 0)
+		return -1;
+	
+	if(font->in != NULL) {
+		fclose(font->in);
+		font->in = NULL;
+	}
+
+	info = xalloc(FTInfo);
+
+	memzero(info, sizeof(FTInfo));
+	info->fmftype    = DviFontAny; /* any metrics type will do */	
+	info->fmfname    = lookup_font_metrics(font->fontname, &info->fmftype);
+	info->fontname   = font->fontname;
+	info->hasmetrics = 0;
+	info->loaded     = 0;
+
+	/* these will be obtained from the fontmaps */
+	info->mapinfo.psname   = NULL;
+	info->mapinfo.encoding = NULL;
+	info->mapinfo.fontfile = NULL;
+	info->mapinfo.extend   = 0;
+	info->mapinfo.slant    = 0;
+
+	/* initialize these */
+	font->chars = xnalloc(DviFontChar, 256);
+	font->loc = 0;
+	font->hic = 255;
+	for(i = 0; i < 256; i++) {
+		font->chars[i].offset = 1;
+		font->chars[i].glyph.data = NULL;
+		font->chars[i].shrunk.data = NULL;
+		font->chars[i].grey.data = NULL;
+	}
+	
+	if(info->fmfname == NULL)
+		mdvi_warning(_("(tt) %s: no font metric data\n"), font->fontname);
+	
+	listh_append(&ttfonts, LIST(info));
+	font->private = info;
+
+	return 0;
+}
+
+static int tt_get_bitmap(DviParams *params, DviFont *font, 
+	int code, double xscale, double yscale, DviGlyph *glyph)
+{
+	TT_Outline	outline;
+	TT_Raster_Map	raster;
+	TT_BBox		bbox;
+	TT_Glyph_Metrics	metrics;
+	TT_Matrix	mat;
+	FTInfo	*info;
+	int	error;
+	int	have_outline = 0;
+	int	w, h;
+
+	info = (FTInfo *)font->private;
+	if(info == NULL)
+		return -1;
+
+	error = TT_Load_Glyph(info->instance, info->glyph,
+		code, TTLOAD_DEFAULT);
+	if(error) goto tt_error;
+	error = TT_Get_Glyph_Outline(info->glyph, &outline);
+	if(error) goto tt_error;
+	have_outline = 1;
+	mat.xx = FROUND(xscale * 65536);
+	mat.yy = FROUND(yscale * 65536);
+	mat.yx = 0;
+	mat.xy = 0;
+	TT_Transform_Outline(&outline, &mat);
+	error = TT_Get_Outline_BBox(&outline, &bbox);
+	if(error) goto tt_error;
+	bbox.xMin &= -64;
+	bbox.yMin &= -64;
+	bbox.xMax = (bbox.xMax + 63) & -64;
+	bbox.yMax = (bbox.yMax + 63) & -64;
+	w = (bbox.xMax - bbox.xMin) / 64;
+	h = (bbox.yMax - bbox.yMin) / 64;
+
+	glyph->w = w;
+	glyph->h = h;
+	glyph->x = -bbox.xMin / 64;
+	glyph->y = bbox.yMax / 64;
+	if(!w || !h)
+		goto tt_error;
+	raster.rows = h;
+	raster.width = w;
+	raster.cols = ROUND(w, 8);
+	raster.size = h * raster.cols;
+	raster.flow = TT_Flow_Down;
+	raster.bitmap = mdvi_calloc(h, raster.cols);
+	
+	TT_Translate_Outline(&outline, -bbox.xMin, -bbox.yMin);
+	TT_Get_Outline_Bitmap(tt_handle, &outline, &raster);
+	glyph->data = bitmap_convert_msb8(raster.bitmap, w, h, ROUND(w, 8));
+	TT_Done_Outline(&outline);
+	mdvi_free(raster.bitmap);
+	
+	return 0;
+tt_error:
+	if(have_outline)
+		TT_Done_Outline(&outline);
+	return -1;	
+}
+
+static int tt_font_get_glyph(DviParams *params, DviFont *font, int code)
+{
+	FTInfo *info = (FTInfo *)font->private;
+	DviFontChar *ch;
+	int	error;
+	double	xs, ys;
+	int	dpi;
+			
+	ASSERT(info != NULL);
+	if(!info->hasmetrics && tt_really_load_font(params, font, info) < 0)
+		return -1;
+	ch = FONTCHAR(font, code);
+	if(!ch || !glyph_present(ch))
+		return -1;
+	ch->loaded = 1;
+	if(!ch->width || !ch->height)
+		goto blank;
+	if(ch->code == 0) {
+		ch->glyph.data = NULL;
+		goto missing;
+	}
+	/* get the glyph */
+	dpi = Max(font->hdpi, font->vdpi);
+	error = tt_get_bitmap(params, font, ch->code,
+		(double)font->hdpi / dpi,
+		(double)font->vdpi / dpi,
+		&ch->glyph);
+	if(error)	
+		goto missing;
+	ch->x = ch->glyph.x;
+	ch->y = ch->glyph.y;
+		
+	return 0;
+
+missing:
+	ch->glyph.data = MDVI_GLYPH_EMPTY;
+	ch->missing = 1;
+blank:
+	ch->glyph.w = ch->width;
+	ch->glyph.h = ch->height;
+	ch->glyph.x = ch->x;
+	ch->glyph.y = ch->y;
+	return 0;
+}
+
+static void tt_shrink_glyph(DviContext *dvi, DviFont *font, DviFontChar *ch, DviGlyph *dest)
+{
+	tt_get_bitmap(&dvi->params, font,
+		ch->code,
+		(double)font->hdpi / (dvi->params.dpi * dvi->params.hshrink),
+		(double)font->vdpi / (dvi->params.vdpi * dvi->params.vshrink),
+		dest);
+	/* transform the glyph for the current orientation */
+	font_transform_glyph(dvi->params.orientation, dest);
+}
+
+static void tt_reset_font(DviFont *font)
+{
+	FTInfo	*info = (FTInfo *)font->private;
+	
+	if(info == NULL)
+		return;
+	info->hasmetrics = 0;	
+}
+
+static void tt_font_remove(FTInfo *info)
+{
+	FTInfo	*old;
+
+	if(info->loaded) {
+		/* all fonts in the hash table have called TT_Open_Face */
+		TT_Done_Instance(info->instance);
+		TT_Close_Face(info->face);
+	}
+	listh_remove(&ttfonts, LIST(info));
+	/* release our encodings */
+	if(info->encoding)
+		mdvi_release_encoding(info->encoding, 1);
+	/* and destroy the font */
+	if(info->tfminfo)
+		free_font_metrics(info->tfminfo);
+	if(info->fmfname)
+		mdvi_free(info->fmfname);
+	mdvi_free(info);
+}
+
+static void tt_free_data(DviFont *font)
+{
+	if(font->private == NULL)
+		return;
+	
+	tt_font_remove((FTInfo *)font->private);
+	if(initialized && ttfonts.count == 0) {
+		DEBUG((DBG_TT, "(tt) last font removed -- closing FreeType\n"));
+		TT_Done_FreeType(tt_handle);
+		initialized = 0;
+	}
+}
+
+#endif /* WITH_TRUETYPE_FONTS */