366 lines
17 KiB
C
366 lines
17 KiB
C
/* SPDX-License-Identifier: MIT */
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/* Copyright 2010, SIL International, All rights reserved. */
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#pragma once
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#include "graphite2/Types.h"
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#define GR2_VERSION_MAJOR 1
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#define GR2_VERSION_MINOR 3
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#define GR2_VERSION_BUGFIX 13
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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typedef struct gr_face gr_face;
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typedef struct gr_font gr_font;
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typedef struct gr_feature_ref gr_feature_ref;
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typedef struct gr_feature_val gr_feature_val;
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/**
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* Returns version information on this engine
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*/
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GR2_API void gr_engine_version(int *nMajor, int *nMinor, int *nBugFix);
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/**
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* The Face Options allow the application to require that certain tables are
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* read during face construction. This may be of concern if the appFaceHandle
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* used in the gr_get_table_fn may change.
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* The values can be combined
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*/
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enum gr_face_options {
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/** No preload, no cmap caching, fail if the graphite tables are invalid */
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gr_face_default = 0,
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/** Dumb rendering will be enabled if the graphite tables are invalid. @deprecated Since 1.311 */
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gr_face_dumbRendering = 1,
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/** preload glyphs at construction time */
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gr_face_preloadGlyphs = 2,
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/** Cache the lookup from code point to glyph ID at construction time */
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gr_face_cacheCmap = 4,
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/** Preload everything */
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gr_face_preloadAll = gr_face_preloadGlyphs | gr_face_cacheCmap
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};
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/** Holds information about a particular Graphite silf table that has been loaded */
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struct gr_faceinfo {
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uint16_t extra_ascent; /**< The extra_ascent in the GDL, in design units */
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uint16_t extra_descent; /**< The extra_descent in the GDL, in design units */
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uint16_t upem; /**< The design units for the font */
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enum gr_space_contextuals {
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gr_space_unknown = 0, /**< no information is known. */
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gr_space_none = 1, /**< the space character never occurs in any rules. */
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gr_space_left_only = 2, /**< the space character only occurs as the first element in a rule. */
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gr_space_right_only = 3, /**< the space character only occurs as the last element in a rule. */
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gr_space_either_only = 4, /**< the space character only occurs as the only element in a rule. */
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gr_space_both = 5, /**< the space character may occur as the first or last element of a rule. */
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gr_space_cross = 6 /**< the space character occurs in a rule not as a first or last element. */
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} space_contextuals;
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unsigned int has_bidi_pass : 1; /**< the table specifies that a bidirectional pass should run */
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unsigned int line_ends : 1; /**< there are line end contextuals somewhere */
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unsigned int justifies : 1; /**< there are .justify properties set somewhere on some glyphs */
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};
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typedef struct gr_faceinfo gr_faceinfo;
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/** type describing function to retrieve font table information
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*
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* @return a pointer to the table in memory. The pointed to memory must exist as
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* long as the gr_face which makes the call.
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* @param appFaceHandle is the unique information passed to gr_make_face()
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* @param name is a 32bit tag to the table name.
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* @param len returned by this function to say how long the table is in memory.
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*/
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typedef const void *(*gr_get_table_fn)(const void* appFaceHandle, unsigned int name, size_t *len);
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/** type describing function to release any resources allocated by the above get_table table function
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*
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* @param appFaceHandle is the unique information passed to gr_make_face()
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* @param pointer to table memory returned by get_table.
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*/
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typedef void (*gr_release_table_fn)(const void* appFaceHandle, const void *table_buffer);
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/** struct housing function pointers to manage font table buffers for the graphite engine. */
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struct gr_face_ops
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{
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/** size in bytes of this structure */
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size_t size;
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/** a pointer to a function to request a table from the client. */
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gr_get_table_fn get_table;
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/** is a pointer to a function to notify the client the a table can be released.
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* This can be NULL to signify that the client does not wish to do any release handling. */
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gr_release_table_fn release_table;
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};
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typedef struct gr_face_ops gr_face_ops;
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/** Create a gr_face object given application information and a table functions.
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*
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* @return gr_face or NULL if the font fails to load for some reason.
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* @param appFaceHandle This is application specific information that is passed
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* to the getTable function. The appFaceHandle must stay
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* alive as long as the gr_face is alive.
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* @param face_ops Pointer to face specific callback structure for table
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* management. Must stay alive for the duration of the
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* call only.
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* @param faceOptions Bitfield describing various options. See enum gr_face_options for details.
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*/
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GR2_API gr_face* gr_make_face_with_ops(const void* appFaceHandle/*non-NULL*/, const gr_face_ops *face_ops, unsigned int faceOptions);
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/** @deprecated Since v1.2.0 in favour of gr_make_face_with_ops.
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* Create a gr_face object given application information and a getTable function.
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*
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* @return gr_face or NULL if the font fails to load for some reason.
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* @param appFaceHandle This is application specific information that is passed
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* to the getTable function. The appFaceHandle must stay
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* alive as long as the gr_face is alive.
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* @param getTable Callback function to get table data.
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* @param faceOptions Bitfield describing various options. See enum gr_face_options for details.
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*/
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GR2_DEPRECATED_API gr_face* gr_make_face(const void* appFaceHandle/*non-NULL*/, gr_get_table_fn getTable, unsigned int faceOptions);
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/** @deprecated Since 1.3.7 this function is now an alias for gr_make_face_with_ops().
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*
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* Create a gr_face object given application information, with subsegmental caching support
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*
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* @return gr_face or NULL if the font fails to load.
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* @param appFaceHandle is a pointer to application specific information that is passed to getTable.
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* This may not be NULL and must stay alive as long as the gr_face is alive.
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* @param face_ops Pointer to face specific callback structure for table management. Must stay
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* alive for the duration of the call only.
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* @param segCacheMaxSize Unused.
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* @param faceOptions Bitfield of values from enum gr_face_options
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*/
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GR2_DEPRECATED_API gr_face* gr_make_face_with_seg_cache_and_ops(const void* appFaceHandle, const gr_face_ops *face_ops, unsigned int segCacheMaxSize, unsigned int faceOptions);
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/** @deprecated Since 1.3.7 this function is now an alias for gr_make_face().
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*
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* Create a gr_face object given application information, with subsegmental caching support.
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* This function is deprecated as of v1.2.0 in favour of gr_make_face_with_seg_cache_and_ops.
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*
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* @return gr_face or NULL if the font fails to load.
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* @param appFaceHandle is a pointer to application specific information that is passed to getTable.
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* This may not be NULL and must stay alive as long as the gr_face is alive.
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* @param getTable The function graphite calls to access font table data
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* @param segCacheMaxSize How large the segment cache is.
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* @param faceOptions Bitfield of values from enum gr_face_options
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*/
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GR2_DEPRECATED_API gr_face* gr_make_face_with_seg_cache(const void* appFaceHandle, gr_get_table_fn getTable, unsigned int segCacheMaxSize, unsigned int faceOptions);
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/** Convert a tag in a string into a uint32_t
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*
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* @return uint32_t tag, zero padded
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* @param str a nul terminated string of which at most the first 4 characters are read
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*/
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GR2_API uint32_t gr_str_to_tag(const char *str);
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/** Convert a uint32_t tag into a string
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*
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* @param tag contains the tag to convert
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* @param str is a pointer to a char array of at least size 4 bytes. The first 4 bytes of this array
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* will be overwritten by this function. No nul is appended.
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*/
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GR2_API void gr_tag_to_str(uint32_t tag, char *str);
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/** Get feature values for a given language or default
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*
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* @return a copy of the default feature values for a given language. The application must call
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* gr_featureval_destroy() to free this object when done.
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* @param pFace The font face to get feature values from
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* @param langname The language tag to get feature values for. If there is no such language or
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* langname is 0, the default feature values for the font are returned.
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* langname is right 0 padded and assumes lowercase. Thus the en langauge
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* would be 0x656E0000. Langname may also be space padded, thus 0x656E2020.
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*/
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GR2_API gr_feature_val* gr_face_featureval_for_lang(const gr_face* pFace, uint32_t langname);
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/** Get feature reference for a given feature id from a face
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*
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* @return a feature reference corresponding to the given id. This data is part of the gr_face and
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* will be freed when the face is destroyed.
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* @param pFace Font face to get information on.
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* @param featId Feature id tag to get reference to.
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*/
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GR2_API const gr_feature_ref* gr_face_find_fref(const gr_face* pFace, uint32_t featId);
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/** Returns number of feature references in a face **/
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GR2_API uint16_t gr_face_n_fref(const gr_face* pFace);
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/** Returns feature reference at given index in face **/
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GR2_API const gr_feature_ref* gr_face_fref(const gr_face* pFace, uint16_t i);
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/** Return number of languages the face knows about **/
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GR2_API unsigned short gr_face_n_languages(const gr_face* pFace);
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/** Returns a language id corresponding to a language of given index in the face **/
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GR2_API uint32_t gr_face_lang_by_index(const gr_face* pFace, uint16_t i);
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/** Destroy the given face and free its memory **/
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GR2_API void gr_face_destroy(gr_face *face);
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/** Returns the number of glyphs in the face **/
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GR2_API unsigned short gr_face_n_glyphs(const gr_face* pFace);
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/** Returns a faceinfo for the face and script **/
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GR2_API const gr_faceinfo *gr_face_info(const gr_face *pFace, uint32_t script);
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/** Returns whether the font supports a given Unicode character
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*
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* @return true if the character is supported.
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* @param pFace face to test within
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* @param usv Unicode Scalar Value of character to test
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* @param script Tag of script for selecting which set of pseudo glyphs to test. May be NULL.
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*/
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GR2_API int gr_face_is_char_supported(const gr_face *pFace, uint32_t usv, uint32_t script);
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#ifndef GRAPHITE2_NFILEFACE
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/** Create gr_face from a font file
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*
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* @return gr_face that accesses a font file directly. Returns NULL on failure.
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* @param filename Full path and filename to font file
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* @param faceOptions Bitfile from enum gr_face_options to control face options.
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*/
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GR2_API gr_face* gr_make_file_face(const char *filename, unsigned int faceOptions);
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/** @deprecated Since 1.3.7. This function is now an alias for gr_make_file_face().
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*
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* Create gr_face from a font file, with subsegment caching support.
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*
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* @return gr_face that accesses a font file directly. Returns NULL on failure.
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* @param filename Full path and filename to font file
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* @param segCacheMaxSize Specifies how big to make the cache in segments.
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* @param faceOptions Bitfield from enum gr_face_options to control face options.
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*/
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GR2_DEPRECATED_API gr_face* gr_make_file_face_with_seg_cache(const char *filename, unsigned int segCacheMaxSize, unsigned int faceOptions);
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#endif // !GRAPHITE2_NFILEFACE
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/** Create a font from a face
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*
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* @return gr_font Call font_destroy to free this font
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* @param ppm Resolution of the font in pixels per em
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* @param face Face this font corresponds to. This must stay alive as long as the font is alive.
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*/
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GR2_API gr_font* gr_make_font(float ppm, const gr_face *face);
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/** query function to find the hinted advance of a glyph
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*
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* @param appFontHandle is the unique information passed to gr_make_font_with_advance()
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* @param glyphid is the glyph to retireve the hinted advance for.
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*/
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typedef float (*gr_advance_fn)(const void* appFontHandle, uint16_t glyphid);
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/** struct housing function pointers to manage font hinted metrics for the
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* graphite engine. */
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struct gr_font_ops
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{
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/** size of the structure in bytes to allow for future extensibility */
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size_t size;
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/** a pointer to a function to retrieve the hinted
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* advance width of a glyph which the font cannot
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* provide without client assistance. This can be
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* NULL to signify no horizontal hinted metrics are necessary. */
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gr_advance_fn glyph_advance_x;
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/** a pointer to a function to retrieve the hinted
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* advance height of a glyph which the font cannot
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* provide without client assistance. This can be
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* NULL to signify no horizontal hinted metrics are necessary. */
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gr_advance_fn glyph_advance_y;
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};
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typedef struct gr_font_ops gr_font_ops;
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/** Creates a font with hinted advance width query functions
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*
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* @return gr_font to be destroyed via font_destroy
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* @param ppm size of font in pixels per em
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* @param appFontHandle font specific information that must stay alive as long
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* as the font does
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* @param font_ops pointer font specific callback structure for hinted metrics.
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* Need only stay alive for the duration of the call.
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* @param face the face this font corresponds to. Must stay alive as long as
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* the font does.
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*/
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GR2_API gr_font* gr_make_font_with_ops(float ppm, const void* appFontHandle, const gr_font_ops * font_ops, const gr_face *face);
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/** Creates a font with hinted advance width query function.
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* This function is deprecated. Use gr_make_font_with_ops instead.
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*
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* @return gr_font to be destroyed via font_destroy
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* @param ppm size of font in pixels per em
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* @param appFontHandle font specific information that must stay alive as long
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* as the font does
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* @param getAdvance callback function reference that returns horizontal advance in pixels for a glyph.
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* @param face the face this font corresponds to. Must stay alive as long as
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* the font does.
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*/
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GR2_API gr_font* gr_make_font_with_advance_fn(float ppm, const void* appFontHandle, gr_advance_fn getAdvance, const gr_face *face);
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/** Free a font **/
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GR2_API void gr_font_destroy(gr_font *font);
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/** get a feature value
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*
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* @return value of specific feature or 0 if any problems.
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* @param pfeatureref gr_feature_ref to the feature
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* @param feats gr_feature_val containing all the values
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*/
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GR2_API uint16_t gr_fref_feature_value(const gr_feature_ref* pfeatureref, const gr_feature_val* feats);
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/** set a feature value
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*
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* @return false if there were any problems (value out of range, etc.)
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* @param pfeatureref gr_feature_ref to the feature
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* @param val value to set the feature to
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* @param pDest the gr_feature_val containing all the values for all the features
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*/
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GR2_API int gr_fref_set_feature_value(const gr_feature_ref* pfeatureref, uint16_t val, gr_feature_val* pDest);
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/** Returns the id tag for a gr_feature_ref **/
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GR2_API uint32_t gr_fref_id(const gr_feature_ref* pfeatureref);
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/** Returns number of values a feature may take, given a gr_feature_ref **/
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GR2_API uint16_t gr_fref_n_values(const gr_feature_ref* pfeatureref);
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/** Returns the value associated with a particular value in a feature
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*
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* @return value
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* @param pfeatureref gr_feature_ref of the feature of interest
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* @param settingno Index up to the return value of gr_fref_n_values() of the value
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*/
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GR2_API int16_t gr_fref_value(const gr_feature_ref* pfeatureref, uint16_t settingno);
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/** Returns a string of the UI name of a feature
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*
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* @return string of the UI name, in the encoding form requested. Call gr_label_destroy() after use.
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* @param pfeatureref gr_feature_ref of the feature
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* @param langId This is a pointer since the face may not support a string in the requested
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* language. The actual language of the string is returned in langId
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* @param utf Encoding form for the string
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* @param length Used to return the length of the string returned in bytes.
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*/
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GR2_API void* gr_fref_label(const gr_feature_ref* pfeatureref, uint16_t *langId, enum gr_encform utf, uint32_t *length);
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/** Return a UI string for a possible value of a feature
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*
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* @return string of the UI name, in the encoding form requested. nul terminated. Call gr_label_destroy()
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* after use.
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* @param pfeatureref gr_feature_ref of the feature
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* @param settingno Value setting index
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* @param langId This is a pointer to the requested language. The requested language id is
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* replaced by the actual language id of the string returned.
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* @param utf Encoding form for the string
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* @param length Returns the length of the string returned in bytes.
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*/
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GR2_API void* gr_fref_value_label(const gr_feature_ref* pfeatureref, uint16_t settingno/*rather than a value*/, uint16_t *langId, enum gr_encform utf, uint32_t *length);
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/** Destroy a previously returned label string **/
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GR2_API void gr_label_destroy(void * label);
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/** Copies a gr_feature_val **/
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GR2_API gr_feature_val* gr_featureval_clone(const gr_feature_val* pfeatures);
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/** Destroys a gr_feature_val **/
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GR2_API void gr_featureval_destroy(gr_feature_val *pfeatures);
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#ifdef __cplusplus
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}
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#endif
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