pdf-font.c

#include "mupdf/pdf.h"

#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_XFREE86_H

static void pdf_load_font_descriptor(fz_context *ctx, pdf_document *doc, pdf_font_desc *fontdesc, pdf_obj *dict, char *collection, char *basefont, int iscidfont);

static const char *base_font_names[][10] =
{
	{ "Courier", "CourierNew", "CourierNewPSMT", NULL },
	{ "Courier-Bold", "CourierNew,Bold", "Courier,Bold",
		"CourierNewPS-BoldMT", "CourierNew-Bold", NULL },
	{ "Courier-Oblique", "CourierNew,Italic", "Courier,Italic",
		"CourierNewPS-ItalicMT", "CourierNew-Italic", NULL },
	{ "Courier-BoldOblique", "CourierNew,BoldItalic", "Courier,BoldItalic",
		"CourierNewPS-BoldItalicMT", "CourierNew-BoldItalic", NULL },
	{ "Helvetica", "ArialMT", "Arial", NULL },
	{ "Helvetica-Bold", "Arial-BoldMT", "Arial,Bold", "Arial-Bold",
		"Helvetica,Bold", NULL },
	{ "Helvetica-Oblique", "Arial-ItalicMT", "Arial,Italic", "Arial-Italic",
		"Helvetica,Italic", "Helvetica-Italic", NULL },
	{ "Helvetica-BoldOblique", "Arial-BoldItalicMT",
		"Arial,BoldItalic", "Arial-BoldItalic",
		"Helvetica,BoldItalic", "Helvetica-BoldItalic", NULL },
	{ "Times-Roman", "TimesNewRomanPSMT", "TimesNewRoman",
		"TimesNewRomanPS", NULL },
	{ "Times-Bold", "TimesNewRomanPS-BoldMT", "TimesNewRoman,Bold",
		"TimesNewRomanPS-Bold", "TimesNewRoman-Bold", NULL },
	{ "Times-Italic", "TimesNewRomanPS-ItalicMT", "TimesNewRoman,Italic",
		"TimesNewRomanPS-Italic", "TimesNewRoman-Italic", NULL },
	{ "Times-BoldItalic", "TimesNewRomanPS-BoldItalicMT",
		"TimesNewRoman,BoldItalic", "TimesNewRomanPS-BoldItalic",
		"TimesNewRoman-BoldItalic", NULL },
	{ "Symbol", "Symbol,Italic", "Symbol,Bold", "Symbol,BoldItalic",
		"SymbolMT", "SymbolMT,Italic", "SymbolMT,Bold", "SymbolMT,BoldItalic", NULL },
	{ "ZapfDingbats", NULL }
};

static int is_dynalab(char *name)
{
	if (strstr(name, "HuaTian"))
		return 1;
	if (strstr(name, "MingLi"))
		return 1;
	if ((strstr(name, "DF") == name) || strstr(name, "+DF"))
		return 1;
	if ((strstr(name, "DLC") == name) || strstr(name, "+DLC"))
		return 1;
	return 0;
}

static int strcmp_ignore_space(const char *a, const char *b)
{
	while (1)
	{
		while (*a == ' ')
			a++;
		while (*b == ' ')
			b++;
		if (*a != *b)
			return 1;
		if (*a == 0)
			return *a != *b;
		if (*b == 0)
			return *a != *b;
		a++;
		b++;
	}
}

static const char *clean_font_name(const char *fontname)
{
	int i, k;
	for (i = 0; i < nelem(base_font_names); i++)
		for (k = 0; base_font_names[i][k]; k++)
			if (!strcmp_ignore_space(base_font_names[i][k], fontname))
				return base_font_names[i][0];
	return fontname;
}

/*
 * FreeType and Rendering glue
 */

enum { UNKNOWN, TYPE1, TRUETYPE };

static int ft_kind(FT_Face face)
{
	const char *kind = FT_Get_X11_Font_Format(face);
	if (!strcmp(kind, "TrueType"))
		return TRUETYPE;
	if (!strcmp(kind, "Type 1"))
		return TYPE1;
	if (!strcmp(kind, "CFF"))
		return TYPE1;
	if (!strcmp(kind, "CID Type 1"))
		return TYPE1;
	return UNKNOWN;
}

static int ft_is_bold(FT_Face face)
{
	return face->style_flags & FT_STYLE_FLAG_BOLD;
}

static int ft_is_italic(FT_Face face)
{
	return face->style_flags & FT_STYLE_FLAG_ITALIC;
}

static int ft_char_index(FT_Face face, int cid)
{
	int gid = FT_Get_Char_Index(face, cid);
	if (gid == 0)
		gid = FT_Get_Char_Index(face, 0xf000 + cid);

	/* some chinese fonts only ship the similarly looking 0x2026 */
	if (gid == 0 && cid == 0x22ef)
		gid = FT_Get_Char_Index(face, 0x2026);

	return gid;
}

static int ft_cid_to_gid(pdf_font_desc *fontdesc, int cid)
{
	if (fontdesc->to_ttf_cmap)
	{
		cid = pdf_lookup_cmap(fontdesc->to_ttf_cmap, cid);
		return ft_char_index(fontdesc->font->ft_face, cid);
	}

	if (fontdesc->cid_to_gid && cid < fontdesc->cid_to_gid_len && cid >= 0)
		return fontdesc->cid_to_gid[cid];

	return cid;
}

int
pdf_font_cid_to_gid(fz_context *ctx, pdf_font_desc *fontdesc, int cid)
{
	if (fontdesc->font->ft_face)
		return ft_cid_to_gid(fontdesc, cid);
	return cid;
}

static int ft_width(fz_context *ctx, pdf_font_desc *fontdesc, int cid)
{
	int gid = ft_cid_to_gid(fontdesc, cid);
	int fterr;

	fterr = FT_Load_Glyph(fontdesc->font->ft_face, gid,
			FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP | FT_LOAD_IGNORE_TRANSFORM);
	if (fterr)
	{
		fz_warn(ctx, "freetype load glyph (gid %d): %s", gid, ft_error_string(fterr));
		return 0;
	}
	return ((FT_Face)fontdesc->font->ft_face)->glyph->advance.x;
}

static int lookup_mre_code(char *name)
{
	int i;
	for (i = 0; i < 256; i++)
		if (pdf_mac_roman[i] && !strcmp(name, pdf_mac_roman[i]))
			return i;
	return -1;
}

/*
 * Load font files.
 */

static void
pdf_load_builtin_font(fz_context *ctx, pdf_font_desc *fontdesc, char *fontname, int has_descriptor)
{
	FT_Face face;
	const char *clean_name = clean_font_name(fontname);

	fontdesc->font = fz_load_system_font(ctx, fontname, 0, 0, !has_descriptor);
	if (!fontdesc->font)
	{
		unsigned char *data;
		unsigned int len;

		data = pdf_lookup_builtin_font(ctx, clean_name, &len);
		if (!data)
			fz_throw(ctx, FZ_ERROR_GENERIC, "cannot find builtin font: '%s'", fontname);

		fontdesc->font = fz_new_font_from_memory(ctx, fontname, data, len, 0, 1);
	}

	if (!strcmp(clean_name, "Symbol") || !strcmp(clean_name, "ZapfDingbats"))
		fontdesc->flags |= PDF_FD_SYMBOLIC;

	face = fontdesc->font->ft_face;
	fontdesc->ascent = 1000.0f * face->ascender / face->units_per_EM;
	fontdesc->descent = 1000.0f * face->descender / face->units_per_EM;
}

static void
pdf_load_substitute_font(fz_context *ctx, pdf_font_desc *fontdesc, char *fontname, int mono, int serif, int bold, int italic)
{
	fontdesc->font = fz_load_system_font(ctx, fontname, bold, italic, 0);
	if (!fontdesc->font)
	{
		unsigned char *data;
		unsigned int len;

		data = pdf_lookup_substitute_font(ctx, mono, serif, bold, italic, &len);
		if (!data)
			fz_throw(ctx, FZ_ERROR_GENERIC, "cannot find substitute font");

		fontdesc->font = fz_new_font_from_memory(ctx, fontname, data, len, 0, 1);
		fontdesc->font->ft_bold = bold && !ft_is_bold(fontdesc->font->ft_face);
		fontdesc->font->ft_italic = italic && !ft_is_italic(fontdesc->font->ft_face);
	}

	fontdesc->font->ft_substitute = 1;
}

static void
pdf_load_substitute_cjk_font(fz_context *ctx, pdf_font_desc *fontdesc, char *fontname, int ros, int serif)
{
	fontdesc->font = fz_load_system_cjk_font(ctx, fontname, ros, serif);
	if (!fontdesc->font)
	{
		unsigned char *data;
		unsigned int len;
		int index;

		data = pdf_lookup_substitute_cjk_font(ctx, ros, serif, fontdesc->wmode, &len, &index);
		if (!data)
			fz_throw(ctx, FZ_ERROR_GENERIC, "cannot find builtin CJK font");

		/* A glyph bbox cache is too big for CJK fonts. */
		fontdesc->font = fz_new_font_from_memory(ctx, fontname, data, len, index, 0);
	}

	fontdesc->font->ft_substitute = 1;
}

static void
pdf_load_system_font(fz_context *ctx, pdf_font_desc *fontdesc, char *fontname, char *collection)
{
	int bold = 0;
	int italic = 0;
	int serif = 0;
	int mono = 0;

	if (strstr(fontname, "Bold"))
		bold = 1;
	if (strstr(fontname, "Italic"))
		italic = 1;
	if (strstr(fontname, "Oblique"))
		italic = 1;

	if (fontdesc->flags & PDF_FD_FIXED_PITCH)
		mono = 1;
	if (fontdesc->flags & PDF_FD_SERIF)
		serif = 1;
	if (fontdesc->flags & PDF_FD_ITALIC)
		italic = 1;
	if (fontdesc->flags & PDF_FD_FORCE_BOLD)
		bold = 1;

	if (collection)
	{
		if (!strcmp(collection, "Adobe-CNS1"))
			pdf_load_substitute_cjk_font(ctx, fontdesc, fontname, FZ_ADOBE_CNS_1, serif);
		else if (!strcmp(collection, "Adobe-GB1"))
			pdf_load_substitute_cjk_font(ctx, fontdesc, fontname, FZ_ADOBE_GB_1, serif);
		else if (!strcmp(collection, "Adobe-Japan1"))
			pdf_load_substitute_cjk_font(ctx, fontdesc, fontname, FZ_ADOBE_JAPAN_1, serif);
		else if (!strcmp(collection, "Adobe-Korea1"))
			pdf_load_substitute_cjk_font(ctx, fontdesc, fontname, FZ_ADOBE_KOREA_1, serif);
		else
		{
			if (strcmp(collection, "Adobe-Identity") != 0)
				fz_warn(ctx, "unknown cid collection: %s", collection);
			pdf_load_substitute_font(ctx, fontdesc, fontname, mono, serif, bold, italic);
		}
	}
	else
	{
		pdf_load_substitute_font(ctx, fontdesc, fontname, mono, serif, bold, italic);
	}
}

static void
pdf_load_embedded_font(fz_context *ctx, pdf_document *doc, pdf_font_desc *fontdesc, char *fontname, pdf_obj *stmref)
{
	fz_buffer *buf;

	fz_try(ctx)
	{
		buf = pdf_load_stream(ctx, doc, pdf_to_num(ctx, stmref), pdf_to_gen(ctx, stmref));
	}
	fz_catch(ctx)
	{
		fz_rethrow_message(ctx, "cannot load font stream (%d %d R)", pdf_to_num(ctx, stmref), pdf_to_gen(ctx, stmref));
	}

	fz_try(ctx)
	{
		fontdesc->font = fz_new_font_from_buffer(ctx, fontname, buf, 0, 1);
	}
	fz_always(ctx)
	{
		fz_drop_buffer(ctx, buf);
	}
	fz_catch(ctx)
	{
		fz_rethrow_message(ctx, "cannot load embedded font (%d %d R)", pdf_to_num(ctx, stmref), pdf_to_gen(ctx, stmref));
	}
	fontdesc->size += buf->len;

	fontdesc->is_embedded = 1;
}

/*
 * Create and destroy
 */

pdf_font_desc *
pdf_keep_font(fz_context *ctx, pdf_font_desc *fontdesc)
{
	return (pdf_font_desc *)fz_keep_storable(ctx, &fontdesc->storable);
}

void
pdf_drop_font(fz_context *ctx, pdf_font_desc *fontdesc)
{
	fz_drop_storable(ctx, &fontdesc->storable);
}

static void
pdf_drop_font_imp(fz_context *ctx, fz_storable *fontdesc_)
{
	pdf_font_desc *fontdesc = (pdf_font_desc *)fontdesc_;

	if (fontdesc->font)
		fz_drop_font(ctx, fontdesc->font);
	if (fontdesc->encoding)
		pdf_drop_cmap(ctx, fontdesc->encoding);
	if (fontdesc->to_ttf_cmap)
		pdf_drop_cmap(ctx, fontdesc->to_ttf_cmap);
	if (fontdesc->to_unicode)
		pdf_drop_cmap(ctx, fontdesc->to_unicode);
	fz_free(ctx, fontdesc->cid_to_gid);
	fz_free(ctx, fontdesc->cid_to_ucs);
	fz_free(ctx, fontdesc->hmtx);
	fz_free(ctx, fontdesc->vmtx);
	fz_free(ctx, fontdesc);
}

pdf_font_desc *
pdf_new_font_desc(fz_context *ctx)
{
	pdf_font_desc *fontdesc;

	fontdesc = fz_malloc_struct(ctx, pdf_font_desc);
	FZ_INIT_STORABLE(fontdesc, 1, pdf_drop_font_imp);
	fontdesc->size = sizeof(pdf_font_desc);

	fontdesc->font = NULL;

	fontdesc->flags = 0;
	fontdesc->italic_angle = 0;
	fontdesc->ascent = 0;
	fontdesc->descent = 0;
	fontdesc->cap_height = 0;
	fontdesc->x_height = 0;
	fontdesc->missing_width = 0;

	fontdesc->encoding = NULL;
	fontdesc->to_ttf_cmap = NULL;
	fontdesc->cid_to_gid_len = 0;
	fontdesc->cid_to_gid = NULL;

	fontdesc->to_unicode = NULL;
	fontdesc->cid_to_ucs_len = 0;
	fontdesc->cid_to_ucs = NULL;

	fontdesc->wmode = 0;

	fontdesc->hmtx_cap = 0;
	fontdesc->vmtx_cap = 0;
	fontdesc->hmtx_len = 0;
	fontdesc->vmtx_len = 0;
	fontdesc->hmtx = NULL;
	fontdesc->vmtx = NULL;

	fontdesc->dhmtx.lo = 0x0000;
	fontdesc->dhmtx.hi = 0xFFFF;
	fontdesc->dhmtx.w = 1000;

	fontdesc->dvmtx.lo = 0x0000;
	fontdesc->dvmtx.hi = 0xFFFF;
	fontdesc->dvmtx.x = 0;
	fontdesc->dvmtx.y = 880;
	fontdesc->dvmtx.w = -1000;

	fontdesc->is_embedded = 0;

	return fontdesc;
}

/*
 * Simple fonts (Type1 and TrueType)
 */

static pdf_font_desc *
pdf_load_simple_font_by_name(fz_context *ctx, pdf_document *doc, pdf_obj *dict, char *basefont)
{
	pdf_obj *descriptor;
	pdf_obj *encoding;
	pdf_obj *widths;
	unsigned short *etable = NULL;
	pdf_font_desc *fontdesc = NULL;
	pdf_obj *subtype;
	FT_Face face;
	FT_CharMap cmap;
	int symbolic;
	int kind;

	char *estrings[256];
	char ebuffer[256][32];
	int i, k, n;
	int fterr;
	int has_lock = 0;

	fz_var(fontdesc);
	fz_var(etable);
	fz_var(has_lock);

	/* Load font file */
	fz_try(ctx)
	{
		fontdesc = pdf_new_font_desc(ctx);

		descriptor = pdf_dict_get(ctx, dict, PDF_NAME_FontDescriptor);
		if (descriptor)
			pdf_load_font_descriptor(ctx, doc, fontdesc, descriptor, NULL, basefont, 0);
		else
			pdf_load_builtin_font(ctx, fontdesc, basefont, 0);

		/* Some chinese documents mistakenly consider WinAnsiEncoding to be codepage 936 */
		if (descriptor && pdf_is_string(ctx, pdf_dict_get(ctx, descriptor, PDF_NAME_FontName)) &&
			!pdf_dict_get(ctx, dict, PDF_NAME_ToUnicode) &&
			pdf_name_eq(ctx, pdf_dict_get(ctx, dict, PDF_NAME_Encoding), PDF_NAME_WinAnsiEncoding) &&
			pdf_to_int(ctx, pdf_dict_get(ctx, descriptor, PDF_NAME_Flags)) == 4)
		{
			char *cp936fonts[] = {
				"\xCB\xCE\xCC\xE5", "SimSun,Regular",
				"\xBA\xDA\xCC\xE5", "SimHei,Regular",
				"\xBF\xAC\xCC\xE5_GB2312", "SimKai,Regular",
				"\xB7\xC2\xCB\xCE_GB2312", "SimFang,Regular",
				"\xC1\xA5\xCA\xE9", "SimLi,Regular",
				NULL
			};
			for (i = 0; cp936fonts[i]; i += 2)
				if (!strcmp(basefont, cp936fonts[i]))
					break;
			if (cp936fonts[i])
			{
				fz_warn(ctx, "workaround for S22PDF lying about chinese font encodings");
				pdf_drop_font(ctx, fontdesc);
				fontdesc = NULL;
				fontdesc = pdf_new_font_desc(ctx);
				pdf_load_font_descriptor(ctx, doc, fontdesc, descriptor, "Adobe-GB1", cp936fonts[i+1], 0);
				fontdesc->encoding = pdf_load_system_cmap(ctx, "GBK-EUC-H");
				fontdesc->to_unicode = pdf_load_system_cmap(ctx, "Adobe-GB1-UCS2");
				fontdesc->to_ttf_cmap = pdf_load_system_cmap(ctx, "Adobe-GB1-UCS2");

				face = fontdesc->font->ft_face;
				/* kind = ft_kind(face); */
				goto skip_encoding;
			}
		}

		face = fontdesc->font->ft_face;
		kind = ft_kind(face);

		/* Encoding */

		symbolic = fontdesc->flags & 4;

		if (face->num_charmaps > 0)
			cmap = face->charmaps[0];
		else
			cmap = NULL;

		for (i = 0; i < face->num_charmaps; i++)
		{
			FT_CharMap test = face->charmaps[i];

			if (kind == TYPE1)
			{
				if (test->platform_id == 7)
					cmap = test;
			}

			if (kind == TRUETYPE)
			{
				if (test->platform_id == 1 && test->encoding_id == 0)
					cmap = test;
				if (test->platform_id == 3 && test->encoding_id == 1)
					cmap = test;
				if (symbolic && test->platform_id == 3 && test->encoding_id == 0)
					cmap = test;
			}
		}

		if (cmap)
		{
			fterr = FT_Set_Charmap(face, cmap);
			if (fterr)
				fz_warn(ctx, "freetype could not set cmap: %s", ft_error_string(fterr));
		}
		else
			fz_warn(ctx, "freetype could not find any cmaps");

		etable = fz_malloc_array(ctx, 256, sizeof(unsigned short));
		fontdesc->size += 256 * sizeof(unsigned short);
		for (i = 0; i < 256; i++)
		{
			estrings[i] = NULL;
			etable[i] = 0;
		}

		encoding = pdf_dict_get(ctx, dict, PDF_NAME_Encoding);
		if (encoding)
		{
			if (pdf_is_name(ctx, encoding))
				pdf_load_encoding(estrings, pdf_to_name(ctx, encoding));

			if (pdf_is_dict(ctx, encoding))
			{
				pdf_obj *base, *diff, *item;

				base = pdf_dict_get(ctx, encoding, PDF_NAME_BaseEncoding);
				if (pdf_is_name(ctx, base))
					pdf_load_encoding(estrings, pdf_to_name(ctx, base));
				else if (!fontdesc->is_embedded && !symbolic)
					pdf_load_encoding(estrings, "StandardEncoding");

				diff = pdf_dict_get(ctx, encoding, PDF_NAME_Differences);
				if (pdf_is_array(ctx, diff))
				{
					n = pdf_array_len(ctx, diff);
					k = 0;
					for (i = 0; i < n; i++)
					{
						item = pdf_array_get(ctx, diff, i);
						if (pdf_is_int(ctx, item))
							k = pdf_to_int(ctx, item);
						if (pdf_is_name(ctx, item) && k >= 0 && k < nelem(estrings))
							estrings[k++] = pdf_to_name(ctx, item);
					}
				}
			}
		}
		else if (!fontdesc->is_embedded && !symbolic)
			pdf_load_encoding(estrings, "StandardEncoding");

		/* start with the builtin encoding */
		for (i = 0; i < 256; i++)
			etable[i] = ft_char_index(face, i);

		fz_lock(ctx, FZ_LOCK_FREETYPE);
		has_lock = 1;

		/* built-in and substitute fonts may be a different type than what the document expects */
		subtype = pdf_dict_get(ctx, dict, PDF_NAME_Subtype);
		if (pdf_name_eq(ctx, subtype, PDF_NAME_Type1))
			kind = TYPE1;
		else if (pdf_name_eq(ctx, subtype, PDF_NAME_MMType1))
			kind = TYPE1;
		else if (pdf_name_eq(ctx, subtype, PDF_NAME_TrueType))
			kind = TRUETYPE;
		else if (pdf_name_eq(ctx, subtype, PDF_NAME_CIDFontType0))
			kind = TYPE1;
		else if (pdf_name_eq(ctx, subtype, PDF_NAME_CIDFontType2))
			kind = TRUETYPE;

		/* encode by glyph name where we can */
		if (kind == TYPE1)
		{
			for (i = 0; i < 256; i++)
			{
				if (estrings[i])
				{
					etable[i] = FT_Get_Name_Index(face, estrings[i]);
					if (etable[i] == 0)
					{
						int aglcode = pdf_lookup_agl(estrings[i]);
						const char **dupnames = pdf_lookup_agl_duplicates(aglcode);
						while (*dupnames)
						{
							etable[i] = FT_Get_Name_Index(face, (char*)*dupnames);
							if (etable[i])
								break;
							dupnames++;
						}
						if (etable[i] == 0)
						{
							char buf[10];
							sprintf(buf, "uni%04X", aglcode);
							etable[i] = FT_Get_Name_Index(face, buf);
						}
					}
				}
			}
		}

		/* encode by glyph name where we can */
		if (kind == TRUETYPE)
		{
			/* Unicode cmap */
			if (!symbolic && face->charmap && face->charmap->platform_id == 3)
			{
				for (i = 0; i < 256; i++)
				{
					if (estrings[i])
					{
						int aglcode = pdf_lookup_agl(estrings[i]);
						if (!aglcode)
							etable[i] = FT_Get_Name_Index(face, estrings[i]);
						else
							etable[i] = ft_char_index(face, aglcode);
					}
				}
			}

			/* MacRoman cmap */
			else if (!symbolic && face->charmap && face->charmap->platform_id == 1)
			{
				for (i = 0; i < 256; i++)
				{
					if (estrings[i])
					{
						k = lookup_mre_code(estrings[i]);
						if (k <= 0)
							etable[i] = FT_Get_Name_Index(face, estrings[i]);
						else
							etable[i] = ft_char_index(face, k);
					}
				}
			}

			/* Symbolic cmap */
			else if (!face->charmap || face->charmap->encoding != FT_ENCODING_MS_SYMBOL)
			{
				for (i = 0; i < 256; i++)
				{
					if (estrings[i])
					{
						etable[i] = FT_Get_Name_Index(face, estrings[i]);
						if (etable[i] == 0)
							etable[i] = ft_char_index(face, i);
					}
				}
			}
		}

		/* try to reverse the glyph names from the builtin encoding */
		for (i = 0; i < 256; i++)
		{
			if (etable[i] && !estrings[i])
			{
				if (FT_HAS_GLYPH_NAMES(face))
				{
					fterr = FT_Get_Glyph_Name(face, etable[i], ebuffer[i], 32);
					if (fterr)
						fz_warn(ctx, "freetype get glyph name (gid %d): %s", etable[i], ft_error_string(fterr));
					if (ebuffer[i][0])
						estrings[i] = ebuffer[i];
				}
				else
				{
					estrings[i] = (char*) pdf_win_ansi[i]; /* discard const */
				}
			}
		}

		/* symbolic Type 1 fonts with an implicit encoding and non-standard glyph names */
		if (kind == TYPE1 && symbolic)
		{
			for (i = 0; i < 256; i++)
				if (etable[i] && estrings[i] && !pdf_lookup_agl(estrings[i]))
					estrings[i] = (char*) pdf_standard[i];
		}

		fz_unlock(ctx, FZ_LOCK_FREETYPE);
		has_lock = 0;

		fontdesc->encoding = pdf_new_identity_cmap(ctx, 0, 1);
		fontdesc->size += pdf_cmap_size(ctx, fontdesc->encoding);
		fontdesc->cid_to_gid_len = 256;
		fontdesc->cid_to_gid = etable;

		fz_try(ctx)
		{
			pdf_load_to_unicode(ctx, doc, fontdesc, estrings, NULL, pdf_dict_get(ctx, dict, PDF_NAME_ToUnicode));
		}
		fz_catch(ctx)
		{
			fz_rethrow_if(ctx, FZ_ERROR_TRYLATER);
			fz_warn(ctx, "cannot load ToUnicode CMap");
		}

	skip_encoding:

		/* Widths */

		pdf_set_default_hmtx(ctx, fontdesc, fontdesc->missing_width);

		widths = pdf_dict_get(ctx, dict, PDF_NAME_Widths);
		if (widths)
		{
			int first, last;

			first = pdf_to_int(ctx, pdf_dict_get(ctx, dict, PDF_NAME_FirstChar));
			last = pdf_to_int(ctx, pdf_dict_get(ctx, dict, PDF_NAME_LastChar));

			if (first < 0 || last > 255 || first > last)
				first = last = 0;

			for (i = 0; i < last - first + 1; i++)
			{
				int wid = pdf_to_int(ctx, pdf_array_get(ctx, widths, i));
				pdf_add_hmtx(ctx, fontdesc, i + first, i + first, wid);
			}
		}
		else
		{
			fz_lock(ctx, FZ_LOCK_FREETYPE);
			has_lock = 1;
			fterr = FT_Set_Char_Size(face, 1000, 1000, 72, 72);
			if (fterr)
				fz_warn(ctx, "freetype set character size: %s", ft_error_string(fterr));
			for (i = 0; i < 256; i++)
			{
				pdf_add_hmtx(ctx, fontdesc, i, i, ft_width(ctx, fontdesc, i));
			}
			fz_unlock(ctx, FZ_LOCK_FREETYPE);
			has_lock = 0;
		}

		pdf_end_hmtx(ctx, fontdesc);
	}
	fz_catch(ctx)
	{
		if (has_lock)
			fz_unlock(ctx, FZ_LOCK_FREETYPE);
		if (fontdesc && etable != fontdesc->cid_to_gid)
			fz_free(ctx, etable);
		pdf_drop_font(ctx, fontdesc);
		fz_rethrow_message(ctx, "cannot load simple font (%d %d R)", pdf_to_num(ctx, dict), pdf_to_gen(ctx, dict));
	}
	return fontdesc;
}

static pdf_font_desc *
pdf_load_simple_font(fz_context *ctx, pdf_document *doc, pdf_obj *dict)
{
	char *basefont = pdf_to_name(ctx, pdf_dict_get(ctx, dict, PDF_NAME_BaseFont));

	return pdf_load_simple_font_by_name(ctx, doc, dict, basefont);
}

static int
hail_mary_make_hash_key(fz_context *ctx, fz_store_hash *hash, void *key_)
{
	hash->u.i.i0 = 0;
	hash->u.i.i1 = 0;
	hash->u.i.ptr = NULL;
	return 1;
}

static void *
hail_mary_keep_key(fz_context *ctx, void *key)
{
	return key;
}

static void
hail_mary_drop_key(fz_context *ctx, void *key)
{
}

static int
hail_mary_cmp_key(fz_context *ctx, void *k0, void *k1)
{
	return k0 == k1;
}

#ifndef NDEBUG
static void
hail_mary_debug_key(fz_context *ctx, FILE *out, void *key_)
{
	fprintf(out, "hail mary ");
}
#endif

static fz_store_type hail_mary_store_type =
{
	hail_mary_make_hash_key,
	hail_mary_keep_key,
	hail_mary_drop_key,
	hail_mary_cmp_key,
#ifndef NDEBUG
	hail_mary_debug_key
#endif
};

pdf_font_desc *
pdf_load_hail_mary_font(fz_context *ctx, pdf_document *doc)
{
	pdf_font_desc *fontdesc;
	pdf_font_desc *existing;

	if ((fontdesc = fz_find_item(ctx, pdf_drop_font_imp, &hail_mary_store_type, &hail_mary_store_type)) != NULL)
	{
		return fontdesc;
	}

	/* FIXME: Get someone with a clue about fonts to fix this */
	fontdesc = pdf_load_simple_font_by_name(ctx, doc, NULL, "Helvetica");

	existing = fz_store_item(ctx, &hail_mary_store_type, fontdesc, fontdesc->size, &hail_mary_store_type);
	assert(existing == NULL);

	return fontdesc;
}

/*
 * CID Fonts
 */

static pdf_font_desc *
load_cid_font(fz_context *ctx, pdf_document *doc, pdf_obj *dict, pdf_obj *encoding, pdf_obj *to_unicode)
{
	pdf_obj *widths;
	pdf_obj *descriptor;
	pdf_font_desc *fontdesc = NULL;
	pdf_cmap *cmap;
	FT_Face face;
	char collection[256];
	char *basefont;
	int i, k, fterr;
	pdf_obj *cidtogidmap;
	pdf_obj *obj;
	int dw;

	fz_var(fontdesc);

	fz_try(ctx)
	{
		/* Get font name and CID collection */

		basefont = pdf_to_name(ctx, pdf_dict_get(ctx, dict, PDF_NAME_BaseFont));

		{
			pdf_obj *cidinfo;
			char tmpstr[64];
			int tmplen;

			cidinfo = pdf_dict_get(ctx, dict, PDF_NAME_CIDSystemInfo);
			if (!cidinfo)
				fz_throw(ctx, FZ_ERROR_GENERIC, "cid font is missing info");

			obj = pdf_dict_get(ctx, cidinfo, PDF_NAME_Registry);
			tmplen = fz_mini(sizeof tmpstr - 1, pdf_to_str_len(ctx, obj));
			memcpy(tmpstr, pdf_to_str_buf(ctx, obj), tmplen);
			tmpstr[tmplen] = '\0';
			fz_strlcpy(collection, tmpstr, sizeof collection);

			fz_strlcat(collection, "-", sizeof collection);

			obj = pdf_dict_get(ctx, cidinfo, PDF_NAME_Ordering);
			tmplen = fz_mini(sizeof tmpstr - 1, pdf_to_str_len(ctx, obj));
			memcpy(tmpstr, pdf_to_str_buf(ctx, obj), tmplen);
			tmpstr[tmplen] = '\0';
			fz_strlcat(collection, tmpstr, sizeof collection);
		}

		/* Encoding */

		if (pdf_is_name(ctx, encoding))
		{
			if (pdf_name_eq(ctx, encoding, PDF_NAME_Identity_H))
				cmap = pdf_new_identity_cmap(ctx, 0, 2);
			else if (pdf_name_eq(ctx, encoding, PDF_NAME_Identity_V))
				cmap = pdf_new_identity_cmap(ctx, 1, 2);
			else
				cmap = pdf_load_system_cmap(ctx, pdf_to_name(ctx, encoding));
		}
		else if (pdf_is_indirect(ctx, encoding))
		{
			cmap = pdf_load_embedded_cmap(ctx, doc, encoding);
		}
		else
		{
			fz_throw(ctx, FZ_ERROR_GENERIC, "syntaxerror: font missing encoding");
		}

		/* Load font file */

		fontdesc = pdf_new_font_desc(ctx);

		fontdesc->encoding = cmap;
		fontdesc->size += pdf_cmap_size(ctx, fontdesc->encoding);

		pdf_set_font_wmode(ctx, fontdesc, pdf_cmap_wmode(ctx, fontdesc->encoding));

		descriptor = pdf_dict_get(ctx, dict, PDF_NAME_FontDescriptor);
		if (!descriptor)
			fz_throw(ctx, FZ_ERROR_GENERIC, "syntaxerror: missing font descriptor");
		pdf_load_font_descriptor(ctx, doc, fontdesc, descriptor, collection, basefont, 1);

		face = fontdesc->font->ft_face;

		/* Apply encoding */

		cidtogidmap = pdf_dict_get(ctx, dict, PDF_NAME_CIDToGIDMap);
		if (pdf_is_indirect(ctx, cidtogidmap))
		{
			fz_buffer *buf;

			buf = pdf_load_stream(ctx, doc, pdf_to_num(ctx, cidtogidmap), pdf_to_gen(ctx, cidtogidmap));

			fontdesc->cid_to_gid_len = (buf->len) / 2;
			fontdesc->cid_to_gid = fz_malloc_array(ctx, fontdesc->cid_to_gid_len, sizeof(unsigned short));
			fontdesc->size += fontdesc->cid_to_gid_len * sizeof(unsigned short);
			for (i = 0; i < fontdesc->cid_to_gid_len; i++)
				fontdesc->cid_to_gid[i] = (buf->data[i * 2] << 8) + buf->data[i * 2 + 1];

			fz_drop_buffer(ctx, buf);
		}

		/* if font is external, cidtogidmap should not be identity */
		/* so we map from cid to unicode and then map that through the (3 1) */
		/* unicode cmap to get a glyph id */
		else if (fontdesc->font->ft_substitute)
		{
			fterr = FT_Select_Charmap(face, ft_encoding_unicode);
			if (fterr)
			{
				fz_throw(ctx, FZ_ERROR_GENERIC, "fonterror: no unicode cmap when emulating CID font: %s", ft_error_string(fterr));
			}

			if (!strcmp(collection, "Adobe-CNS1"))
				fontdesc->to_ttf_cmap = pdf_load_system_cmap(ctx, "Adobe-CNS1-UCS2");
			else if (!strcmp(collection, "Adobe-GB1"))
				fontdesc->to_ttf_cmap = pdf_load_system_cmap(ctx, "Adobe-GB1-UCS2");
			else if (!strcmp(collection, "Adobe-Japan1"))
				fontdesc->to_ttf_cmap = pdf_load_system_cmap(ctx, "Adobe-Japan1-UCS2");
			else if (!strcmp(collection, "Adobe-Japan2"))
				fontdesc->to_ttf_cmap = pdf_load_system_cmap(ctx, "Adobe-Japan2-UCS2");
			else if (!strcmp(collection, "Adobe-Korea1"))
				fontdesc->to_ttf_cmap = pdf_load_system_cmap(ctx, "Adobe-Korea1-UCS2");
		}

		pdf_load_to_unicode(ctx, doc, fontdesc, NULL, collection, to_unicode);

		/* If we have an identity encoding, we're supposed to use the glyph ids directly.
		 * If we only have a substitute font, that won't work.
		 * Make a last ditch attempt by using
		 * the ToUnicode table if it exists to map via the substitute font's cmap. */
		if (strstr(fontdesc->encoding->cmap_name, "Identity-") && fontdesc->font->ft_substitute)
		{
			fz_warn(ctx, "non-embedded font using identity encoding: %s", basefont);
			if (fontdesc->to_unicode && !fontdesc->to_ttf_cmap)
				fontdesc->to_ttf_cmap = pdf_keep_cmap(ctx, fontdesc->to_unicode);
		}

		/* Horizontal */

		dw = 1000;
		obj = pdf_dict_get(ctx, dict, PDF_NAME_DW);
		if (obj)
			dw = pdf_to_int(ctx, obj);
		pdf_set_default_hmtx(ctx, fontdesc, dw);

		widths = pdf_dict_get(ctx, dict, PDF_NAME_W);
		if (widths)
		{
			int c0, c1, w, n, m;

			n = pdf_array_len(ctx, widths);
			for (i = 0; i < n; )
			{
				c0 = pdf_to_int(ctx, pdf_array_get(ctx, widths, i));
				obj = pdf_array_get(ctx, widths, i + 1);
				if (pdf_is_array(ctx, obj))
				{
					m = pdf_array_len(ctx, obj);
					for (k = 0; k < m; k++)
					{
						w = pdf_to_int(ctx, pdf_array_get(ctx, obj, k));
						pdf_add_hmtx(ctx, fontdesc, c0 + k, c0 + k, w);
					}
					i += 2;
				}
				else
				{
					c1 = pdf_to_int(ctx, obj);
					w = pdf_to_int(ctx, pdf_array_get(ctx, widths, i + 2));
					pdf_add_hmtx(ctx, fontdesc, c0, c1, w);
					i += 3;
				}
			}
		}

		pdf_end_hmtx(ctx, fontdesc);

		/* Vertical */

		if (pdf_cmap_wmode(ctx, fontdesc->encoding) == 1)
		{
			int dw2y = 880;
			int dw2w = -1000;

			obj = pdf_dict_get(ctx, dict, PDF_NAME_DW2);
			if (obj)
			{
				dw2y = pdf_to_int(ctx, pdf_array_get(ctx, obj, 0));
				dw2w = pdf_to_int(ctx, pdf_array_get(ctx, obj, 1));
			}

			pdf_set_default_vmtx(ctx, fontdesc, dw2y, dw2w);

			widths = pdf_dict_get(ctx, dict, PDF_NAME_W2);
			if (widths)
			{
				int c0, c1, w, x, y, n;

				n = pdf_array_len(ctx, widths);
				for (i = 0; i < n; )
				{
					c0 = pdf_to_int(ctx, pdf_array_get(ctx, widths, i));
					obj = pdf_array_get(ctx, widths, i + 1);
					if (pdf_is_array(ctx, obj))
					{
						int m = pdf_array_len(ctx, obj);
						for (k = 0; k * 3 < m; k ++)
						{
							w = pdf_to_int(ctx, pdf_array_get(ctx, obj, k * 3 + 0));
							x = pdf_to_int(ctx, pdf_array_get(ctx, obj, k * 3 + 1));
							y = pdf_to_int(ctx, pdf_array_get(ctx, obj, k * 3 + 2));
							pdf_add_vmtx(ctx, fontdesc, c0 + k, c0 + k, x, y, w);
						}
						i += 2;
					}
					else
					{
						c1 = pdf_to_int(ctx, obj);
						w = pdf_to_int(ctx, pdf_array_get(ctx, widths, i + 2));
						x = pdf_to_int(ctx, pdf_array_get(ctx, widths, i + 3));
						y = pdf_to_int(ctx, pdf_array_get(ctx, widths, i + 4));
						pdf_add_vmtx(ctx, fontdesc, c0, c1, x, y, w);
						i += 5;
					}
				}
			}

			pdf_end_vmtx(ctx, fontdesc);
		}
	}
	fz_catch(ctx)
	{
		pdf_drop_font(ctx, fontdesc);
		fz_rethrow_message(ctx, "cannot load cid font (%d %d R)", pdf_to_num(ctx, dict), pdf_to_gen(ctx, dict));
	}

	return fontdesc;
}

static pdf_font_desc *
pdf_load_type0_font(fz_context *ctx, pdf_document *doc, pdf_obj *dict)
{
	pdf_obj *dfonts;
	pdf_obj *dfont;
	pdf_obj *subtype;
	pdf_obj *encoding;
	pdf_obj *to_unicode;

	dfonts = pdf_dict_get(ctx, dict, PDF_NAME_DescendantFonts);
	if (!dfonts)
		fz_throw(ctx, FZ_ERROR_GENERIC, "cid font is missing descendant fonts");

	dfont = pdf_array_get(ctx, dfonts, 0);

	subtype = pdf_dict_get(ctx, dfont, PDF_NAME_Subtype);
	encoding = pdf_dict_get(ctx, dict, PDF_NAME_Encoding);
	to_unicode = pdf_dict_get(ctx, dict, PDF_NAME_ToUnicode);

	if (pdf_is_name(ctx, subtype) && pdf_name_eq(ctx, subtype, PDF_NAME_CIDFontType0))
		return load_cid_font(ctx, doc, dfont, encoding, to_unicode);
	if (pdf_is_name(ctx, subtype) && pdf_name_eq(ctx, subtype, PDF_NAME_CIDFontType2))
		return load_cid_font(ctx, doc, dfont, encoding, to_unicode);
	fz_throw(ctx, FZ_ERROR_GENERIC, "syntaxerror: unknown cid font type");
}

/*
 * FontDescriptor
 */

static void
pdf_load_font_descriptor(fz_context *ctx, pdf_document *doc, pdf_font_desc *fontdesc, pdf_obj *dict, char *collection, char *basefont, int iscidfont)
{
	pdf_obj *obj1, *obj2, *obj3, *obj;
	char *fontname;
	FT_Face face;

	/* Prefer BaseFont; don't bother with FontName */
	fontname = basefont;

	fontdesc->flags = pdf_to_int(ctx, pdf_dict_get(ctx, dict, PDF_NAME_Flags));
	fontdesc->italic_angle = pdf_to_real(ctx, pdf_dict_get(ctx, dict, PDF_NAME_ItalicAngle));
	fontdesc->ascent = pdf_to_real(ctx, pdf_dict_get(ctx, dict, PDF_NAME_Ascent));
	fontdesc->descent = pdf_to_real(ctx, pdf_dict_get(ctx, dict, PDF_NAME_Descent));
	fontdesc->cap_height = pdf_to_real(ctx, pdf_dict_get(ctx, dict, PDF_NAME_CapHeight));
	fontdesc->x_height = pdf_to_real(ctx, pdf_dict_get(ctx, dict, PDF_NAME_XHeight));
	fontdesc->missing_width = pdf_to_real(ctx, pdf_dict_get(ctx, dict, PDF_NAME_MissingWidth));

	obj1 = pdf_dict_get(ctx, dict, PDF_NAME_FontFile);
	obj2 = pdf_dict_get(ctx, dict, PDF_NAME_FontFile2);
	obj3 = pdf_dict_get(ctx, dict, PDF_NAME_FontFile3);
	obj = obj1 ? obj1 : obj2 ? obj2 : obj3;

	if (pdf_is_indirect(ctx, obj))
	{
		fz_try(ctx)
		{
			pdf_load_embedded_font(ctx, doc, fontdesc, fontname, obj);
		}
		fz_catch(ctx)
		{
			fz_rethrow_if(ctx, FZ_ERROR_TRYLATER);
			fz_warn(ctx, "ignored error when loading embedded font; attempting to load system font");
			if (!iscidfont && fontname != clean_font_name(fontname))
				pdf_load_builtin_font(ctx, fontdesc, fontname, 1);
			else
				pdf_load_system_font(ctx, fontdesc, fontname, collection);
		}
	}
	else
	{
		if (!iscidfont && fontname != clean_font_name(fontname))
			pdf_load_builtin_font(ctx, fontdesc, fontname, 1);
		else
			pdf_load_system_font(ctx, fontdesc, fontname, collection);
	}

	/* Check for DynaLab fonts that must use hinting */
	face = fontdesc->font->ft_face;
	if (ft_kind(face) == TRUETYPE)
	{
		if (FT_IS_TRICKY(face) || is_dynalab(fontdesc->font->name))
			fontdesc->font->ft_hint = 1;

		if (fontdesc->ascent == 0.0f)
			fontdesc->ascent = 1000.0f * face->ascender / face->units_per_EM;

		if (fontdesc->descent == 0.0f)
			fontdesc->descent = 1000.0f * face->descender / face->units_per_EM;
	}
}

static void
pdf_make_width_table(fz_context *ctx, pdf_font_desc *fontdesc)
{
	fz_font *font = fontdesc->font;
	int i, k, n, cid, gid;

	n = 0;
	for (i = 0; i < fontdesc->hmtx_len; i++)
	{
		for (k = fontdesc->hmtx[i].lo; k <= fontdesc->hmtx[i].hi; k++)
		{
			cid = pdf_lookup_cmap(fontdesc->encoding, k);
			gid = pdf_font_cid_to_gid(ctx, fontdesc, cid);
			if (gid > n)
				n = gid;
		}
	};

	font->width_count = n + 1;
	font->width_table = fz_malloc_array(ctx, font->width_count, sizeof(int));
	memset(font->width_table, 0, font->width_count * sizeof(int));
	fontdesc->size += font->width_count * sizeof(int);

	for (i = 0; i < fontdesc->hmtx_len; i++)
	{
		for (k = fontdesc->hmtx[i].lo; k <= fontdesc->hmtx[i].hi; k++)
		{
			cid = pdf_lookup_cmap(fontdesc->encoding, k);
			gid = pdf_font_cid_to_gid(ctx, fontdesc, cid);
			if (gid >= 0 && gid < font->width_count)
				font->width_table[gid] = fz_maxi(fontdesc->hmtx[i].w, font->width_table[gid]);
		}
	}
}

pdf_font_desc *
pdf_load_font(fz_context *ctx, pdf_document *doc, pdf_obj *rdb, pdf_obj *dict, int nested_depth)
{
	pdf_obj *subtype;
	pdf_obj *dfonts;
	pdf_obj *charprocs;
	pdf_font_desc *fontdesc;
	int type3 = 0;

	if ((fontdesc = pdf_find_item(ctx, pdf_drop_font_imp, dict)) != NULL)
	{
		return fontdesc;
	}

	subtype = pdf_dict_get(ctx, dict, PDF_NAME_Subtype);
	dfonts = pdf_dict_get(ctx, dict, PDF_NAME_DescendantFonts);
	charprocs = pdf_dict_get(ctx, dict, PDF_NAME_CharProcs);

	if (pdf_name_eq(ctx, subtype, PDF_NAME_Type0))
		fontdesc = pdf_load_type0_font(ctx, doc, dict);
	else if (pdf_name_eq(ctx, subtype, PDF_NAME_Type1))
		fontdesc = pdf_load_simple_font(ctx, doc, dict);
	else if (pdf_name_eq(ctx, subtype, PDF_NAME_MMType1))
		fontdesc = pdf_load_simple_font(ctx, doc, dict);
	else if (pdf_name_eq(ctx, subtype, PDF_NAME_TrueType))
		fontdesc = pdf_load_simple_font(ctx, doc, dict);
	else if (pdf_name_eq(ctx, subtype, PDF_NAME_Type3))
	{
		fontdesc = pdf_load_type3_font(ctx, doc, rdb, dict);
		type3 = 1;
	}
	else if (charprocs)
	{
		fz_warn(ctx, "unknown font format, guessing type3.");
		fontdesc = pdf_load_type3_font(ctx, doc, rdb, dict);
		type3 = 1;
	}
	else if (dfonts)
	{
		fz_warn(ctx, "unknown font format, guessing type0.");
		fontdesc = pdf_load_type0_font(ctx, doc, dict);
	}
	else
	{
		fz_warn(ctx, "unknown font format, guessing type1 or truetype.");
		fontdesc = pdf_load_simple_font(ctx, doc, dict);
	}

	/* Save the widths to stretch non-CJK substitute fonts */
	if (fontdesc->font->ft_substitute && !fontdesc->to_ttf_cmap)
		pdf_make_width_table(ctx, fontdesc);

	pdf_store_item(ctx, dict, fontdesc, fontdesc->size);

	if (type3)
		pdf_load_type3_glyphs(ctx, doc, fontdesc, nested_depth);

	return fontdesc;
}

#ifndef NDEBUG
void
pdf_print_font(fz_context *ctx, pdf_font_desc *fontdesc)
{
	int i;

	printf("fontdesc {\n");

	if (fontdesc->font->ft_face)
		printf("\tfreetype font\n");
	if (fontdesc->font->t3procs)
		printf("\ttype3 font\n");

	printf("\twmode %d\n", fontdesc->wmode);
	printf("\tDW %d\n", fontdesc->dhmtx.w);

	printf("\tW {\n");
	for (i = 0; i < fontdesc->hmtx_len; i++)
		printf("\t\t<%04x> <%04x> %d\n",
			fontdesc->hmtx[i].lo, fontdesc->hmtx[i].hi, fontdesc->hmtx[i].w);
	printf("\t}\n");

	if (fontdesc->wmode)
	{
		printf("\tDW2 [%d %d]\n", fontdesc->dvmtx.y, fontdesc->dvmtx.w);
		printf("\tW2 {\n");
		for (i = 0; i < fontdesc->vmtx_len; i++)
			printf("\t\t<%04x> <%04x> %d %d %d\n", fontdesc->vmtx[i].lo, fontdesc->vmtx[i].hi,
				fontdesc->vmtx[i].x, fontdesc->vmtx[i].y, fontdesc->vmtx[i].w);
		printf("\t}\n");
	}
}
#endif

fz_rect *pdf_measure_text(fz_context *ctx, pdf_font_desc *fontdesc, unsigned char *buf, int len, fz_rect *acc)
{
	int i;
	int w = 0;

	for (i = 0; i < len; i++)
		w += pdf_lookup_hmtx(ctx, fontdesc, buf[i]).w;

	acc->x0 = 0;
	acc->x1 = w / 1000.0f;
	acc->y0 = fontdesc->descent / 1000.0f;
	acc->y1 = fontdesc->ascent / 1000.0f;

	return acc;
}

float pdf_text_stride(fz_context *ctx, pdf_font_desc *fontdesc, float fontsize, unsigned char *buf, int len, float room, int *count)
{
	pdf_hmtx h;
	int i = 0;
	float x = 0.0;

	while(i < len)
	{
		float span;

		h = pdf_lookup_hmtx(ctx, fontdesc, buf[i]);

		span = h.w * fontsize / 1000.0;

		if (x + span > room)
			break;

		x += span;
		i ++;
	}

	if (count)
		*count = i;

	return x;
}