// Copyright (C) 2004-2025 Artifex Software, Inc.
//
// This file is part of MuPDF.
//
// MuPDF is free software: you can redistribute it and/or modify it under the
// terms of the GNU Affero General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// MuPDF 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 Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License
// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
//
// Alternative licensing terms are available from the licensor.
// For commercial licensing, see <https://www.artifex.com/> or contact
// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
// CA 94129, USA, for further information.

#ifndef MUPDF_FITZ_FONT_H
#define MUPDF_FITZ_FONT_H

#include "mupdf/fitz/system.h"
#include "mupdf/fitz/context.h"
#include "mupdf/fitz/geometry.h"
#include "mupdf/fitz/buffer.h"
#include "mupdf/fitz/color.h"

/* forward declaration for circular dependency */
struct fz_device;

/* Various font encoding tables and lookup functions */

FZ_DATA extern const char *fz_glyph_name_from_adobe_standard[256];
FZ_DATA extern const char *fz_glyph_name_from_iso8859_7[256];
FZ_DATA extern const char *fz_glyph_name_from_koi8u[256];
FZ_DATA extern const char *fz_glyph_name_from_mac_expert[256];
FZ_DATA extern const char *fz_glyph_name_from_mac_roman[256];
FZ_DATA extern const char *fz_glyph_name_from_win_ansi[256];
FZ_DATA extern const char *fz_glyph_name_from_windows_1252[256];

FZ_DATA extern const unsigned short fz_unicode_from_iso8859_1[256];
FZ_DATA extern const unsigned short fz_unicode_from_iso8859_7[256];
FZ_DATA extern const unsigned short fz_unicode_from_koi8u[256];
FZ_DATA extern const unsigned short fz_unicode_from_pdf_doc_encoding[256];
FZ_DATA extern const unsigned short fz_unicode_from_windows_1250[256];
FZ_DATA extern const unsigned short fz_unicode_from_windows_1251[256];
FZ_DATA extern const unsigned short fz_unicode_from_windows_1252[256];

int fz_iso8859_1_from_unicode(int u);
int fz_iso8859_7_from_unicode(int u);
int fz_koi8u_from_unicode(int u);
int fz_windows_1250_from_unicode(int u);
int fz_windows_1251_from_unicode(int u);
int fz_windows_1252_from_unicode(int u);

int fz_unicode_from_glyph_name(const char *name);
int fz_unicode_from_glyph_name_strict(const char *name);
const char **fz_duplicate_glyph_names_from_unicode(int unicode);
const char *fz_glyph_name_from_unicode_sc(int unicode);

/**
 * A text decoder (to read arbitrary encodings and convert to unicode).
 */
typedef struct fz_text_decoder fz_text_decoder;

struct fz_text_decoder {
	// get maximum size estimate of converted text (fast)
	int (*decode_bound)(fz_text_decoder *dec, unsigned char *input, int n);

	// get exact size of converted text (slow)
	int (*decode_size)(fz_text_decoder *dec, unsigned char *input, int n);

	// convert text into output buffer
	void (*decode)(fz_text_decoder *dec, char *output, unsigned char *input, int n);

	// for internal use only; do not touch!
	void *table1;
	void *table2;
};

/* Initialize a text decoder using an IANA encoding name.
 * See source/fitz/text-decoder.c for the exact list of supported encodings.
 * Will throw an exception if the requested encoding is not available.
 *
 * The following is a subset of the supported encodings (see source/fitz/text-decoder.c for the full list):
 *   iso-8859-1
 *   iso-8859-7
 *   koi8-r
 *   euc-jp
 *   shift_jis
 *   euc-kr
 *   euc-cn
 *   gb18030
 *   euc-tw
 *   big5
 */
void fz_init_text_decoder(fz_context *ctx, fz_text_decoder *dec, const char *encoding);

/**
	An abstract font handle.
*/
typedef struct fz_font fz_font;

/**
	Fonts come in two variants:
	Regular fonts are handled by FreeType.
	Type 3 fonts have callbacks to the interpreter.
*/

/**
	Retrieve the FT_Face handle
	for the font.

	font: The font to query

	Returns the FT_Face handle for the font, or NULL
	if not a freetype handled font. (Cast to void *
	to avoid nasty header exposure).
*/
void *fz_font_ft_face(fz_context *ctx, fz_font *font);

/**
	Retrieve the Type3 procs
	for a font.

	font: The font to query

	Returns the t3_procs pointer. Will be NULL for a
	non type-3 font.
*/
fz_buffer **fz_font_t3_procs(fz_context *ctx, fz_font *font);

/* common CJK font collections */
enum { FZ_ADOBE_CNS, FZ_ADOBE_GB, FZ_ADOBE_JAPAN, FZ_ADOBE_KOREA };

/**
	Every fz_font carries a set of flags
	within it, in a fz_font_flags_t structure.
*/
typedef struct
{
	unsigned int is_mono : 1;
	unsigned int is_serif : 1;
	unsigned int is_bold : 1;
	unsigned int is_italic : 1;
	unsigned int ft_substitute : 1; /* use substitute metrics */
	unsigned int ft_stretch : 1; /* stretch to match PDF metrics */

	unsigned int fake_bold : 1; /* synthesize bold */
	unsigned int fake_italic : 1; /* synthesize italic */
	unsigned int has_opentype : 1; /* has opentype shaping tables */
	unsigned int invalid_bbox : 1;

	unsigned int cjk : 1;
	unsigned int cjk_lang : 2; /* CNS, GB, JAPAN, or KOREA */

	unsigned int embed : 1;
	unsigned int never_embed : 1;
} fz_font_flags_t;

/**
	Retrieve a pointer to the font flags
	for a given font. These can then be updated as required.

	font: The font to query

	Returns a pointer to the flags structure (or NULL, if
	the font is NULL).
*/
fz_font_flags_t *fz_font_flags(fz_font *font);

/**
	In order to shape a given font, we need to
	declare it to a shaper library (harfbuzz, by default, but others
	are possible). To avoid redeclaring it every time we need to
	shape, we hold a shaper handle and the destructor for it within
	the font itself. The handle is initialised by the caller when
	first required and the destructor is called when the fz_font is
	destroyed.
*/
typedef struct
{
	void *shaper_handle;
	void (*destroy)(fz_context *ctx, void *); /* Destructor for shape_handle */
} fz_shaper_data_t;

/**
	Retrieve a pointer to the shaper data
	structure for the given font.

	font: The font to query.

	Returns a pointer to the shaper data structure (or NULL if
	font is NULL).
*/
fz_shaper_data_t *fz_font_shaper_data(fz_context *ctx, fz_font *font);

/**
	Retrieve a pointer to the name of the font.

	font: The font to query.

	Returns a pointer to an internal copy of the font name.
	Will never be NULL, but may be the empty string.
*/
const char *fz_font_name(fz_context *ctx, fz_font *font);

/**
	Query whether the font flags say that this font is bold.
*/
int fz_font_is_bold(fz_context *ctx, fz_font *font);

/**
	Query whether the font flags say that this font is italic.
*/
int fz_font_is_italic(fz_context *ctx, fz_font *font);

/**
	Query whether the font flags say that this font is serif.
*/
int fz_font_is_serif(fz_context *ctx, fz_font *font);

/**
	Query whether the font flags say that this font is monospaced.
*/
int fz_font_is_monospaced(fz_context *ctx, fz_font *font);

/**
	Retrieve the font bbox.

	font: The font to query.

	Returns the font bbox by value; it is valid only if
	fz_font_flags(font)->invalid_bbox is zero.
*/
fz_rect fz_font_bbox(fz_context *ctx, fz_font *font);

/**
	Type for user supplied system font loading hook.

	name: The name of the font to load.

	bold: 1 if a bold font desired, 0 otherwise.

	italic: 1 if an italic font desired, 0 otherwise.
	needs_exact_metrics: 1 if an exact metric match is required for
	the font requested.

	Returns a new font handle, or NULL if no font found (or on error).
*/
typedef fz_font *(fz_load_system_font_fn)(fz_context *ctx, const char *name, int bold, int italic, int needs_exact_metrics);

/**
	Type for user supplied cjk font loading hook.

	name: The name of the font to load.

	ordering: The ordering for which to load the font (e.g.
	FZ_ADOBE_KOREA)

	serif: 1 if a serif font is desired, 0 otherwise.

	Returns a new font handle, or NULL if no font found (or on error).
*/
typedef fz_font *(fz_load_system_cjk_font_fn)(fz_context *ctx, const char *name, int ordering, int serif);

/**
	Type for user supplied fallback font loading hook.

	name: The name of the font to load.

	script: UCDN script enum.

	language: FZ_LANG enum.

	serif, bold, italic: boolean style flags.

	Returns a new font handle, or NULL if no font found (or on error).
*/
typedef fz_font *(fz_load_system_fallback_font_fn)(fz_context *ctx, int script, int language, int serif, int bold, int italic);

/**
	Install functions to allow MuPDF to request fonts from the
	system.

	Only one set of hooks can be in use at a time.
*/
void fz_install_load_system_font_funcs(fz_context *ctx,
	fz_load_system_font_fn *f,
	fz_load_system_cjk_font_fn *f_cjk,
	fz_load_system_fallback_font_fn *f_fallback);

/**
	Attempt to load a given font from the system.

	name: The name of the desired font.

	bold: 1 if bold desired, 0 otherwise.

	italic: 1 if italic desired, 0 otherwise.

	needs_exact_metrics: 1 if an exact metrical match is required,
	0 otherwise.

	Returns a new font handle, or NULL if no matching font was found
	(or on error).
*/
fz_font *fz_load_system_font(fz_context *ctx, const char *name, int bold, int italic, int needs_exact_metrics);

/**
	Attempt to load a given font from
	the system.

	name: The name of the desired font.

	ordering: The ordering to load the font from (e.g. FZ_ADOBE_KOREA)

	serif: 1 if serif desired, 0 otherwise.

	Returns a new font handle, or NULL if no matching font was found
	(or on error).
*/
fz_font *fz_load_system_cjk_font(fz_context *ctx, const char *name, int ordering, int serif);

/**
	Search the builtin fonts for a match.
	Whether a given font is present or not will depend on the
	configuration in which MuPDF is built.

	name: The name of the font desired.

	bold: 1 if bold desired, 0 otherwise.

	italic: 1 if italic desired, 0 otherwise.

	len: Pointer to a place to receive the length of the discovered
	font buffer.

	Returns a pointer to the font file data, or NULL if not present.
*/
const unsigned char *fz_lookup_builtin_font(fz_context *ctx, const char *name, int bold, int italic, int *len);

/**
	Search the builtin base14 fonts for a match.
	Whether a given font is present or not will depend on the
	configuration in which MuPDF is built.

	name: The name of the font desired.

	len: Pointer to a place to receive the length of the discovered
	font buffer.

	Returns a pointer to the font file data, or NULL if not present.
*/
const unsigned char *fz_lookup_base14_font(fz_context *ctx, const char *name, int *len);

/**
	Search the builtin cjk fonts for a match.
	Whether a font is present or not will depend on the
	configuration in which MuPDF is built.

	ordering: The desired ordering of the font (e.g. FZ_ADOBE_KOREA).

	len: Pointer to a place to receive the length of the discovered
	font buffer.

	Returns a pointer to the font file data, or NULL if not present.
*/
const unsigned char *fz_lookup_cjk_font(fz_context *ctx, int ordering, int *len, int *index);

/**
	Search the builtin cjk fonts for a match for a given language.
	Whether a font is present or not will depend on the
	configuration in which MuPDF is built.

	lang: Pointer to a (case sensitive) language string (e.g.
	"ja", "ko", "zh-Hant" etc).

	len: Pointer to a place to receive the length of the discovered
	font buffer.

	subfont: Pointer to a place to store the subfont index of the
	discovered font.

	Returns a pointer to the font file data, or NULL if not present.
*/
const unsigned char *fz_lookup_cjk_font_by_language(fz_context *ctx, const char *lang, int *len, int *subfont);

/**
	Return the matching FZ_ADOBE_* ordering
	for the given language tag, such as "zh-Hant", "zh-Hans", "ja", or "ko".
*/
int fz_lookup_cjk_ordering_by_language(const char *name);

/**
	Search the builtin noto fonts for a match.
	Whether a font is present or not will depend on the
	configuration in which MuPDF is built.

	script: The script desired (e.g. UCDN_SCRIPT_KATAKANA).

	lang: The language desired (e.g. FZ_LANG_ja).

	len: Pointer to a place to receive the length of the discovered
	font buffer.

	Returns a pointer to the font file data, or NULL if not present.
*/
const unsigned char *fz_lookup_noto_font(fz_context *ctx, int script, int lang, int *len, int *subfont);

/**
	Search the builtin noto fonts specific symbol fonts.
	Whether a font is present or not will depend on the
	configuration in which MuPDF is built.
*/
const unsigned char *fz_lookup_noto_math_font(fz_context *ctx, int *len);
const unsigned char *fz_lookup_noto_music_font(fz_context *ctx, int *len);
const unsigned char *fz_lookup_noto_symbol1_font(fz_context *ctx, int *len);
const unsigned char *fz_lookup_noto_symbol2_font(fz_context *ctx, int *len);
const unsigned char *fz_lookup_noto_emoji_font(fz_context *ctx, int *len);
const unsigned char *fz_lookup_noto_boxes_font(fz_context *ctx, int *len);

/**
	Look up the Noto font file name for a given script.
	From the returned font stem, you can look for Noto fonts on the system in the form:
		Noto(Sans|Serif)${STEM}-Regular.(otf|ttf)
*/
const char *fz_lookup_noto_stem_from_script(fz_context *ctx, int script, int language);
const char *fz_lookup_script_name(fz_context *ctx, int script, int language);

/**
	Try to load a fallback font for the
	given combination of font attributes. Whether a font is
	present or not will depend on the configuration in which
	MuPDF is built.

	script: The script desired (e.g. UCDN_SCRIPT_KATAKANA).

	language: The language desired (e.g. FZ_LANG_ja).

	serif: 1 if serif desired, 0 otherwise.

	bold: 1 if bold desired, 0 otherwise.

	italic: 1 if italic desired, 0 otherwise.

	Returns a new font handle, or NULL if not available.
*/
fz_font *fz_load_fallback_font(fz_context *ctx, int script, int language, int serif, int bold, int italic);

/**
	Create a new (empty) type3 font.

	name: Name of font (or NULL).

	matrix: Font matrix.

	Returns a new font handle, or throws exception on
	allocation failure.
*/
fz_font *fz_new_type3_font(fz_context *ctx, const char *name, fz_matrix matrix);

/**
	Create a new font from a font file in memory.

	Fonts created in this way, will be eligible for embedding by default.

	name: Name of font (leave NULL to use name from font).

	data: Pointer to the font file data.

	len: Length of the font file data.

	index: Which font from the file to load (0 for default).

	use_glyph_box: 1 if we should use the glyph bbox, 0 otherwise.

	Returns new font handle, or throws exception on error.
*/
fz_font *fz_new_font_from_memory(fz_context *ctx, const char *name, const unsigned char *data, int len, int index, int use_glyph_bbox);

/**
	Create a new font from a font file in a fz_buffer.

	Fonts created in this way, will be eligible for embedding by default.

	name: Name of font (leave NULL to use name from font).

	buffer: Buffer to load from.

	index: Which font from the file to load (0 for default).

	use_glyph_box: 1 if we should use the glyph bbox, 0 otherwise.

	Returns new font handle, or throws exception on error.
*/
fz_font *fz_new_font_from_buffer(fz_context *ctx, const char *name, fz_buffer *buffer, int index, int use_glyph_bbox);

/**
	Create a new font from a font file.

	Fonts created in this way, will be eligible for embedding by default.

	name: Name of font (leave NULL to use name from font).

	path: File path to load from.

	index: Which font from the file to load (0 for default).

	use_glyph_box: 1 if we should use the glyph bbox, 0 otherwise.

	Returns new font handle, or throws exception on error.
*/
fz_font *fz_new_font_from_file(fz_context *ctx, const char *name, const char *path, int index, int use_glyph_bbox);

/**
	Create a new font from one of the built-in fonts.
*/
fz_font *fz_new_base14_font(fz_context *ctx, const char *name);
fz_font *fz_new_cjk_font(fz_context *ctx, int ordering);
fz_font *fz_new_builtin_font(fz_context *ctx, const char *name, int is_bold, int is_italic);

/**
	Control whether a given font should be embedded or not when writing.
*/
void fz_set_font_embedding(fz_context *ctx, fz_font *font, int embed);

/**
	Add a reference to an existing fz_font.

	font: The font to add a reference to.

	Returns the same font.
*/
fz_font *fz_keep_font(fz_context *ctx, fz_font *font);

/**
	Drop a reference to a fz_font, destroying the
	font when the last reference is dropped.

	font: The font to drop a reference to.
*/
void fz_drop_font(fz_context *ctx, fz_font *font);

/**
	Set the font bbox.

	font: The font to set the bbox for.

	xmin, ymin, xmax, ymax: The bounding box.
*/
void fz_set_font_bbox(fz_context *ctx, fz_font *font, float xmin, float ymin, float xmax, float ymax);

/**
	Return a bbox for a given glyph in a font.

	font: The font to look for the glyph in.

	gid: The glyph to bound.

	trm: The matrix to apply to the glyph before bounding.

	Returns rectangle by value containing the bounds of the given
	glyph.
*/
fz_rect fz_bound_glyph(fz_context *ctx, fz_font *font, int gid, fz_matrix trm);

/**
	Determine if a given glyph in a font
	is cacheable. Certain glyphs in a type 3 font cannot safely
	be cached, as their appearance depends on the enclosing
	graphic state.

	font: The font to look for the glyph in.

	gif: The glyph to query.

	Returns non-zero if cacheable, 0 if not.
*/
int fz_glyph_cacheable(fz_context *ctx, fz_font *font, int gid);

/**
	Run a glyph from a Type3 font to
	a given device.

	font: The font to find the glyph in.

	gid: The glyph to run.

	trm: The transform to apply.

	dev: The device to render onto.
*/
void fz_run_t3_glyph(fz_context *ctx, fz_font *font, int gid, fz_matrix trm, struct fz_device *dev);

/**
	Return the advance for a given glyph.

	font: The font to look for the glyph in.

	glyph: The glyph to find the advance for.

	wmode: 1 for vertical mode, 0 for horizontal.

	Returns the advance for the glyph.
*/
float fz_advance_glyph(fz_context *ctx, fz_font *font, int glyph, int wmode);

/**
	Find the glyph id for a given unicode
	character within a font.

	font: The font to look for the unicode character in.

	unicode: The unicode character to encode.

	Returns the glyph id for the given unicode value, or 0 if
	unknown.
*/
int fz_encode_character(fz_context *ctx, fz_font *font, int unicode);

/**
	Encode character, preferring small-caps variant if available.

	font: The font to look for the unicode character in.

	unicode: The unicode character to encode.

	Returns the glyph id for the given unicode value, or 0 if
	unknown.
*/
int fz_encode_character_sc(fz_context *ctx, fz_font *font, int unicode);

/**
	Encode character.

	Either by direct lookup of glyphname within a font, or, failing
	that, by mapping glyphname to unicode and thence to the glyph
	index within the given font.

	Returns zero for type3 fonts.
*/
int fz_encode_character_by_glyph_name(fz_context *ctx, fz_font *font, const char *glyphname);

/**
	Find the glyph id for
	a given unicode character within a font, falling back to
	an alternative if not found.

	font: The font to look for the unicode character in.

	unicode: The unicode character to encode.

	script: The script in use.

	language: The language in use.

	out_font: The font handle in which the given glyph represents
	the requested unicode character. The caller does not own the
	reference it is passed, so should call fz_keep_font if it is
	not simply to be used immediately.

	Returns the glyph id for the given unicode value in the supplied
	font (and sets *out_font to font) if it is present. Otherwise
	an alternative fallback font (based on script/language) is
	searched for. If the glyph is found therein, *out_font is set
	to this reference, and the glyph reference is returned. If it
	cannot be found anywhere, the function returns 0.
*/
int fz_encode_character_with_fallback(fz_context *ctx, fz_font *font, int unicode, int script, int language, fz_font **out_font);

/**
	Find the name of a glyph

	font: The font to look for the glyph in.

	glyph: The glyph id to look for.

	buf: Pointer to a buffer for the name to be inserted into.

	size: The size of the buffer.

	If a font contains a name table, then the name of the glyph
	will be returned in the supplied buffer. Otherwise a name
	is synthesised. The name will be truncated to fit in
	the buffer.
*/
void fz_get_glyph_name(fz_context *ctx, fz_font *font, int glyph, char *buf, int size);

/**
	Retrieve font ascender in ems.
*/
float fz_font_ascender(fz_context *ctx, fz_font *font);

/**
	Retrieve font descender in ems.
*/
float fz_font_descender(fz_context *ctx, fz_font *font);

/**
	Retrieve the MD5 digest for the font's data.
*/
void fz_font_digest(fz_context *ctx, fz_font *font, unsigned char digest[16]);

/* Implementation details: subject to change. */

void fz_decouple_type3_font(fz_context *ctx, fz_font *font, void *t3doc);

/**
	map an FT error number to a
	static string.

	err: The error number to lookup.

	Returns a pointer to a static textual representation
	of a freetype error.
*/
const char *ft_error_string(int err);
int ft_char_index(void *face, int cid);
int ft_name_index(void *face, const char *name);

/**
	Internal functions for our Harfbuzz integration
	to work around the lack of thread safety.
*/

/**
	Lock against Harfbuzz being called
	simultaneously in several threads. This reuses
	FZ_LOCK_FREETYPE.
*/
void fz_hb_lock(fz_context *ctx);

/**
	Unlock after a Harfbuzz call. This reuses
	FZ_LOCK_FREETYPE.
*/
void fz_hb_unlock(fz_context *ctx);

/**
	Callback for use in font cmap enumeration.
*/
typedef void (fz_cmap_callback)(fz_context *ctx, void *opaque, unsigned long ucs, unsigned int gid);

/**
	Enumerate a cmap using a callback.
*/
void fz_enumerate_font_cmap(fz_context *ctx, fz_font *font, fz_cmap_callback *cb, void *opaque);

/**
	Ensure that a font has its ascender/descender values calculated
	from the actual bbox of the glyphs.

	Note, that we combine the declared values from the font (or the
	default values if those are not present) with the actual bbox to
	get the final result. So this can only cause ascender/descender
	to move further apart!
*/
void fz_calculate_font_ascender_descender(fz_context *ctx, fz_font *font);

typedef enum
{
	FZ_ASCDESC_FROM_FONT,
	FZ_ASCDESC_DEFAULT,
	FZ_ASCDESC_FROM_BOUNDS
} fz_ascdesc_source;

#define FZ_MAX_TRUSTWORTHY_ASCENT 8
#define FZ_MAX_TRUSTWORTHY_DESCENT -3

struct fz_font
{
	int refs;
	char name[32];
	char family[32];
	fz_buffer *buffer;

	fz_font_flags_t flags;

	void *ft_face; /* has an FT_Face if used */
	fz_shaper_data_t shaper_data;

	fz_matrix t3matrix;
	void *t3resources;
	fz_buffer **t3procs; /* has 256 entries if used */
	struct fz_display_list **t3lists; /* has 256 entries if used */
	float *t3widths; /* has 256 entries if used */
	unsigned short *t3flags; /* has 256 entries if used */
	void *t3doc; /* a pdf_document for the callback */
	void (*t3run)(fz_context *ctx, void *doc, void *resources, fz_buffer *contents, struct fz_device *dev, fz_matrix ctm, void *gstate, fz_default_colorspaces *default_cs, void *fill_gstate, void *stroke_gstate);
	void (*t3freeres)(fz_context *ctx, void *doc, void *resources);
	int t3loading; /* to detect recursive type3 fonts */

	fz_rect bbox;	/* font bbox is used only for t3 fonts */

	float ascender;
	float descender;
	fz_ascdesc_source ascdesc_src;

	int glyph_count;

	/* per glyph bounding box cache. */
	fz_rect **bbox_table;
	int use_glyph_bbox;

	/* substitute metrics */
	int width_count;
	short width_default; /* in 1000 units */
	short *width_table; /* in 1000 units */

	/* cached glyph metrics */
	float **advance_cache;

	/* cached encoding lookup */
	uint16_t *encoding_cache[256];

	/* cached md5sum for caching */
	int has_digest;
	unsigned char digest[16];

	/* Which font to use in a collection. */
	int subfont;
};

void fz_ft_lock(fz_context *ctx);

void fz_ft_unlock(fz_context *ctx);

/* Internal function. Must be called with FT_ALLOC_LOCK
 * held. Returns 1 if this thread (context!) already holds
 * the freeetype lock. */
int fz_ft_lock_held(fz_context *ctx);

/* Internal function: Extract a ttf from the ttc that underlies
 * a given fz_font. Caller takes ownership of the returned
 * buffer.
 */
fz_buffer *fz_extract_ttf_from_ttc(fz_context *ctx, fz_font *font);

/* Internal function: Given a ttf in a buffer, create a subset
 * ttf in a new buffer that only provides the required gids.
 * Caller takes ownership of the returned buffer.
 *
 * EXPERIMENTAL AND VERY SUBJECT TO CHANGE.
 */
fz_buffer *fz_subset_ttf_for_gids(fz_context *ctx, fz_buffer *orig, int *gids, int num_gids, int symbolic, int cidfont);

/* Internal function: Given a cff in a buffer, create a subset
 * cff in a new buffer that only provides the required gids.
 * Caller takes ownership of the returned buffer.
 *
 * EXPERIMENTAL AND VERY SUBJECT TO CHANGE.
 */
fz_buffer *fz_subset_cff_for_gids(fz_context *ctx, fz_buffer *orig, int *gids, int num_gids, int symbolic, int cidfont);

#endif
