inicial

1 files changed, 519 insertions, 0 deletions

diff --git a/backend/dvi/mdvi-lib/font.c b/backend/dvi/mdvi-lib/font.c
new file mode 100644
index 00000000..2f655df0
--- /dev/null
+++ b/backend/dvi/mdvi-lib/font.c
@@ -0,0 +1,519 @@
+/*
+ * 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 <stdlib.h>
+
+#include "mdvi.h"
+#include "private.h"
+
+static ListHead fontlist;
+
+extern char *_mdvi_fallback_font;
+
+extern void vf_free_macros(DviFont *);
+
+#define finfo	search.info
+#define TYPENAME(font)	\
+	((font)->finfo ? (font)->finfo->name : "none")
+
+int	font_reopen(DviFont *font)
+{
+	if(font->in)
+		fseek(font->in, (long)0, SEEK_SET);
+	else if((font->in = fopen(font->filename, "rb")) == NULL) {
+		DEBUG((DBG_FILES, "reopen(%s) -> Error\n", font->filename));
+		return -1;
+	}
+	DEBUG((DBG_FILES, "reopen(%s) -> Ok.\n", font->filename));
+	return 0;
+}
+
+/* used from context: params and device */
+static int load_font_file(DviParams *params, DviFont *font)
+{
+	int	status;
+			
+	if(SEARCH_DONE(font->search))
+		return -1;
+	if(font->in == NULL && font_reopen(font) < 0)
+		return -1;
+	DEBUG((DBG_FONTS, "%s: loading %s font from `%s'\n",
+		font->fontname,
+		font->finfo->name, font->filename));
+	do {
+		status = font->finfo->load(params, font);
+	} while(status < 0 && mdvi_font_retry(params, font) == 0);
+	if(status < 0)
+		return -1;
+	if(font->in) {
+		fclose(font->in);
+		font->in = NULL;
+	}
+	DEBUG((DBG_FONTS, "reload_font(%s) -> %s\n",
+		font->fontname, status < 0 ? "Error" : "Ok"));
+	return 0;
+}
+
+void	font_drop_one(DviFontRef *ref)
+{
+	DviFont *font;
+	
+	font = ref->ref;
+	mdvi_free(ref);
+	/* drop all children */
+	for(ref = font->subfonts; ref; ref = ref->next) {
+		/* just adjust the reference counts */
+		ref->ref->links--;
+	}
+	if(--font->links == 0) {
+		/* 
+		 * this font doesn't have any more references, but
+		 * we still keep it around in case a virtual font
+		 * requests it.
+		 */
+		if(font->in) {
+			fclose(font->in);
+			font->in = NULL;
+		}
+		if(LIST(font) != fontlist.tail) {
+			/* move it to the end of the list */
+			listh_remove(&fontlist, LIST(font));
+			listh_append(&fontlist, LIST(font));
+		}
+	}
+	DEBUG((DBG_FONTS, "%s: reference dropped, %d more left\n",
+		font->fontname, font->links));
+}
+
+void	font_drop_chain(DviFontRef *head)
+{
+	DviFontRef *ptr;
+	
+	for(; (ptr = head); ) {
+		head = ptr->next;
+		font_drop_one(ptr);
+	}
+}
+
+int	font_free_unused(DviDevice *dev)
+{
+	DviFont	*font, *next;
+	int	count = 0;
+
+	DEBUG((DBG_FONTS, "destroying unused fonts\n"));	
+	for(font = (DviFont *)fontlist.head; font; font = next) {
+		DviFontRef *ref;
+		
+		next = font->next;
+		if(font->links)
+			continue;
+		count++;
+		DEBUG((DBG_FONTS, "removing unused %s font `%s'\n", 
+			TYPENAME(font), font->fontname));
+		listh_remove(&fontlist, LIST(font));
+		if(font->in)
+			fclose(font->in);
+		/* get rid of subfonts (but can't use `drop_chain' here) */
+		for(; (ref = font->subfonts); ) {
+			font->subfonts = ref->next;
+			mdvi_free(ref);
+		}
+		/* remove this font */
+		font_reset_font_glyphs(dev, font, MDVI_FONTSEL_GLYPH);
+		/* let the font destroy its private data */
+		if(font->finfo->freedata)
+			font->finfo->freedata(font);
+		/* destroy characters */
+		if(font->chars)
+			mdvi_free(font->chars);
+		mdvi_free(font->fontname);
+		mdvi_free(font->filename);
+		mdvi_free(font);
+	}
+	DEBUG((DBG_FONTS, "%d unused fonts removed\n", count));
+	return count;
+}
+
+/* used from context: params and device */
+DviFontRef *
+font_reference(
+	DviParams *params, 	/* rendering parameters */
+	Int32 id, 		/* external id number */
+	const char *name, 	/* font name */
+	Int32 sum, 		/* checksum (from DVI of VF) */
+	int hdpi, 		/* resolution */
+	int vdpi,
+	Int32 scale)		/* scaling factor (from DVI or VF) */
+{
+	DviFont	*font;
+	DviFontRef *ref;
+	DviFontRef *subfont_ref;
+	
+	/* see if there is a font with the same characteristics */
+	for(font = (DviFont *)fontlist.head; font; font = font->next) {
+		if(strcmp(name, font->fontname) == 0
+		   && (!sum || !font->checksum || font->checksum == sum)
+		   && font->hdpi == hdpi
+		   && font->vdpi == vdpi
+		   && font->scale == scale)
+		   	break;
+	}
+	/* try to load the font */
+	if(font == NULL) {
+		font = mdvi_add_font(name, sum, hdpi, vdpi, scale);
+		if(font == NULL)
+			return NULL;
+		listh_append(&fontlist, LIST(font));
+	}
+	if(!font->links && !font->chars && load_font_file(params, font) < 0) {
+		DEBUG((DBG_FONTS, "font_reference(%s) -> Error\n", name));
+		return NULL;
+	}
+	ref = xalloc(DviFontRef);
+	ref->ref = font;
+
+	font->links++;
+	for(subfont_ref = font->subfonts; subfont_ref; subfont_ref = subfont_ref->next) {
+		/* just adjust the reference counts */
+		subfont_ref->ref->links++;
+	}
+
+	ref->fontid = id;
+
+	if(LIST(font) != fontlist.head) {
+		listh_remove(&fontlist, LIST(font));
+		listh_prepend(&fontlist, LIST(font));
+	}
+
+	DEBUG((DBG_FONTS, "font_reference(%s) -> %d links\n",
+		font->fontname, font->links));
+	return ref;
+}
+
+void	font_transform_glyph(DviOrientation orient, DviGlyph *g)
+{
+	BITMAP	*map;
+	int	x, y;
+	
+	map = (BITMAP *)g->data;
+	if(MDVI_GLYPH_ISEMPTY(map))
+		map = NULL;
+
+	/* put the glyph in the right orientation */
+	switch(orient) {
+	case MDVI_ORIENT_TBLR:
+		break;
+	case MDVI_ORIENT_TBRL:
+		g->x = g->w - g->x;
+		if(map) bitmap_flip_horizontally(map);
+		break;
+	case MDVI_ORIENT_BTLR:
+		g->y = g->h - g->y;
+		if(map) bitmap_flip_vertically(map);
+		break;
+	case MDVI_ORIENT_BTRL:
+		g->x = g->w - g->x;
+		g->y = g->h - g->y;
+		if(map) bitmap_flip_diagonally(map);
+		break;
+	case MDVI_ORIENT_RP90:
+		if(map) bitmap_rotate_counter_clockwise(map);
+		y = g->y;
+		x = g->w - g->x;
+		g->x = y;
+		g->y = x;
+		SWAPINT(g->w, g->h);
+		break;
+	case MDVI_ORIENT_RM90: 
+		if(map) bitmap_rotate_clockwise(map);
+		y = g->h - g->y;
+		x = g->x;
+		g->x = y;
+		g->y = x;
+		SWAPINT(g->w, g->h);
+		break;
+	case MDVI_ORIENT_IRP90:
+		if(map) bitmap_flip_rotate_counter_clockwise(map);
+		y = g->y;
+		x = g->x;
+		g->x = y;
+		g->y = x;
+		SWAPINT(g->w, g->h);
+		break;
+	case MDVI_ORIENT_IRM90:
+		if(map) bitmap_flip_rotate_clockwise(map);
+		y = g->h - g->y;
+		x = g->w - g->x;
+		g->x = y;
+		g->y = x;
+		SWAPINT(g->w, g->h);
+		break;
+	}
+}
+
+static int load_one_glyph(DviContext *dvi, DviFont *font, int code)
+{
+	BITMAP *map;
+	DviFontChar *ch;
+	int	status;
+
+#ifndef NODEBUG
+	ch = FONTCHAR(font, code);
+	DEBUG((DBG_GLYPHS, "loading glyph code %d in %s (at %u)\n",
+		code, font->fontname, ch->offset));
+#endif
+	if(font->finfo->getglyph == NULL) {
+		/* font type does not need to load glyphs (e.g. vf) */
+		return 0;
+	}
+
+	status = font->finfo->getglyph(&dvi->params, font, code);
+	if(status < 0)
+		return -1;
+	/* get the glyph again (font->chars may have changed) */
+	ch = FONTCHAR(font, code);
+#ifndef NODEBUG
+	map = (BITMAP *)ch->glyph.data;
+	if(DEBUGGING(BITMAP_DATA)) {
+		DEBUG((DBG_BITMAP_DATA,
+			"%s: new %s bitmap for character %d:\n",
+			font->fontname, TYPENAME(font), code));
+		if(MDVI_GLYPH_ISEMPTY(map))
+			DEBUG((DBG_BITMAP_DATA, "blank bitmap\n"));
+		else
+			bitmap_print(stderr, map);
+	}
+#endif
+	/* check if we have to scale it */
+	if(!font->finfo->scalable && font->hdpi != font->vdpi) {
+		int	hs, vs, d;
+		
+		/* we scale it ourselves */
+		d = Max(font->hdpi, font->vdpi);
+		hs = d / font->hdpi;
+		vs = d / font->vdpi;
+		if(ch->width && ch->height && (hs > 1 || vs > 1)) {
+			int	h, v;
+			DviGlyph glyph;
+			
+			DEBUG((DBG_FONTS, 
+				"%s: scaling glyph %d to resolution %dx%d\n",
+				font->fontname, code, font->hdpi, font->vdpi));
+			h = dvi->params.hshrink;
+			v = dvi->params.vshrink;
+			d = dvi->params.density;
+			dvi->params.hshrink = hs;
+			dvi->params.vshrink = vs;
+			dvi->params.density = 50;
+			/* shrink it */
+			font->finfo->shrink0(dvi, font, ch, &glyph);
+			/* restore parameters */
+			dvi->params.hshrink = h;
+			dvi->params.vshrink = v;
+			dvi->params.density = d;
+			/* update glyph data */
+			if(!MDVI_GLYPH_ISEMPTY(ch->glyph.data))
+				bitmap_destroy((BITMAP *)ch->glyph.data);
+			ch->glyph.data = glyph.data;
+			ch->glyph.x = glyph.x;
+			ch->glyph.y = glyph.y;
+			ch->glyph.w = glyph.w;
+			ch->glyph.h = glyph.h;
+		}
+			
+	}
+	font_transform_glyph(dvi->params.orientation, &ch->glyph);
+		
+	return 0;
+}
+
+DviFontChar *font_get_glyph(DviContext *dvi, DviFont *font, int code)
+{
+	DviFontChar *ch;
+
+again:
+	/* if we have not loaded the font yet, do so now */
+	if(!font->chars && load_font_file(&dvi->params, font) < 0)
+		return NULL;
+	
+	/* get the unscaled glyph, maybe loading it from disk */
+	ch = FONTCHAR(font, code);
+	if(!ch || !glyph_present(ch))
+		return NULL;
+	if(!ch->loaded && load_one_glyph(dvi, font, code) == -1) {
+		if(font->chars == NULL) {
+			/* we need to try another font class */
+			goto again;
+		}
+		return NULL;
+	}
+	/* yes, we have to do this again */
+	ch = FONTCHAR(font, code);
+
+	/* Got the glyph. If we also have the right scaled glyph, do no more */
+	if(!ch->width || !ch->height ||
+	   font->finfo->getglyph == NULL ||
+	   (dvi->params.hshrink == 1 && dvi->params.vshrink == 1))
+		return ch;
+	
+	/* If the glyph is empty, we just need to shrink the box */
+	if(ch->missing || MDVI_GLYPH_ISEMPTY(ch->glyph.data)) {
+		if(MDVI_GLYPH_UNSET(ch->shrunk.data))
+			mdvi_shrink_box(dvi, font, ch, &ch->shrunk);
+		return ch;
+	} else if(MDVI_ENABLED(dvi, MDVI_PARAM_ANTIALIASED)) {
+		if(ch->grey.data && 
+		   !MDVI_GLYPH_ISEMPTY(ch->grey.data) &&
+		   ch->fg == dvi->curr_fg && 
+		   ch->bg == dvi->curr_bg)
+		   	return ch;
+		if(ch->grey.data &&
+		   !MDVI_GLYPH_ISEMPTY(ch->grey.data)) {
+			if(dvi->device.free_image)
+				dvi->device.free_image(ch->grey.data);
+			ch->grey.data = NULL;
+		}
+		font->finfo->shrink1(dvi, font, ch, &ch->grey);
+	} else if(!ch->shrunk.data)
+		font->finfo->shrink0(dvi, font, ch, &ch->shrunk);
+
+	return ch;
+}
+
+void	font_reset_one_glyph(DviDevice *dev, DviFontChar *ch, int what)
+{
+	if(!glyph_present(ch))
+		return;
+	if(what & MDVI_FONTSEL_BITMAP) {
+		if(MDVI_GLYPH_NONEMPTY(ch->shrunk.data))
+			bitmap_destroy((BITMAP *)ch->shrunk.data);
+		ch->shrunk.data = NULL;
+	}
+	if(what & MDVI_FONTSEL_GREY) {
+		if(MDVI_GLYPH_NONEMPTY(ch->grey.data)) {
+			if(dev->free_image)
+				dev->free_image(ch->grey.data);
+		}
+		ch->grey.data = NULL;
+	}
+	if(what & MDVI_FONTSEL_GLYPH) {
+		if(MDVI_GLYPH_NONEMPTY(ch->glyph.data))
+			bitmap_destroy((BITMAP *)ch->glyph.data);
+		ch->glyph.data = NULL;
+		ch->loaded = 0;
+	}
+}
+
+void	font_reset_font_glyphs(DviDevice *dev, DviFont *font, int what)
+{
+	int	i;
+	DviFontChar *ch;
+	
+	if(what & MDVI_FONTSEL_GLYPH)
+		what |= MDVI_FONTSEL_BITMAP|MDVI_FONTSEL_GREY;	
+	if(font->subfonts) {
+		DviFontRef *ref;
+		
+		for(ref = font->subfonts; ref; ref = ref->next)
+			font_reset_font_glyphs(dev, ref->ref, what);
+	}
+	if(font->in) {
+		DEBUG((DBG_FILES, "close(%s)\n", font->filename));
+		fclose(font->in);
+		font->in = NULL;
+	}
+	if(font->finfo->getglyph == NULL)
+		return;
+	DEBUG((DBG_FONTS, "resetting glyphs in font `%s'\n", font->fontname));
+	for(ch = font->chars, i = font->loc; i <= font->hic; ch++, i++) {
+		if(glyph_present(ch))
+			font_reset_one_glyph(dev, ch, what);
+	}
+	if((what & MDVI_FONTSEL_GLYPH) && font->finfo->reset)
+		font->finfo->reset(font);
+}	
+
+void	font_reset_chain_glyphs(DviDevice *dev, DviFontRef *head, int what)
+{
+	DviFontRef *ref;
+	
+	for(ref = head; ref; ref = ref->next)
+		font_reset_font_glyphs(dev, ref->ref, what);
+}
+
+static int compare_refs(const void *p1, const void *p2)
+{
+	return ((*(DviFontRef **)p1)->fontid - (*(DviFontRef **)p2)->fontid);
+}
+
+void	font_finish_definitions(DviContext *dvi)
+{
+	int	count;
+	DviFontRef **map, *ref;
+	
+	/* first get rid of unused fonts */
+	font_free_unused(&dvi->device);
+
+	if(dvi->fonts == NULL) {
+		mdvi_warning(_("%s: no fonts defined\n"), dvi->filename);
+		return;
+	}
+	map = xnalloc(DviFontRef *, dvi->nfonts);
+	for(count = 0, ref = dvi->fonts; ref; ref = ref->next)
+		map[count++] = ref;
+	/* sort the array by font id */
+	qsort(map, dvi->nfonts, sizeof(DviFontRef *), compare_refs);
+	dvi->fontmap = map;
+}
+
+DviFontRef *font_find_flat(DviContext *dvi, Int32 id)
+{
+	DviFontRef *ref;
+	
+	for(ref = dvi->fonts; ref; ref = ref->next)
+		if(ref->fontid == id)
+			break;
+	return ref;
+}
+
+DviFontRef *font_find_mapped(DviContext *dvi, Int32 id)
+{
+	int	lo, hi, n;
+	DviFontRef **map;
+	
+	/* do a binary search */
+	lo = 0; hi = dvi->nfonts;
+	map = dvi->fontmap;
+	while(lo < hi) {
+		int	sign;
+		
+		n = (hi + lo) >> 1;
+		sign = (map[n]->fontid - id);
+		if(sign == 0)
+			break;
+		else if(sign < 0)
+			lo = n;
+		else
+			hi = n;
+	}
+	if(lo >= hi)
+		return NULL;
+	return map[n];
+}
+