C++字体库开发之特性解析十三

Freetype#include freetype/freetype.h #include freetype/tttables.h #include memory #include set namespace { struct _Script_Lang { FT_Tag script; FT_Tag language; }; #define SCRIPT_kana FT_MAKE_TAG(k, a, n, a) #define SCRIPT_hani FT_MAKE_TAG(h, a, n, i) #define SCRIPT_hang FT_MAKE_TAG(h, a, n, g) #define LANGUAGE_JAN FT_MAKE_TAG(J, A, N, ) #define LANGUAGE_CHN FT_MAKE_TAG(C, H, N, ) #define LANGUAGE_KOR FT_MAKE_TAG(K, O, R, ) const struct _Script_Lang Script_Lang[] {{SCRIPT_kana, LANGUAGE_JAN}, {SCRIPT_hani, LANGUAGE_CHN}, {SCRIPT_hang, LANGUAGE_KOR}}; #define num_Script_Lang (sizeof(Script_Lang) / sizeof(Script_Lang[0])) } // namespace class TagsParse { public: typedef struct { FT_UShort req; FT_UShort count; FT_UShort *list; } LangSys_Item; typedef struct { FT_Tag tag; FT_ULong ptr; LangSys_Item *entry; } LangSys_Record; typedef struct { FT_ULong ptr; LangSys_Item *entry; FT_UShort count; LangSys_Record *list; } Script_Item; typedef struct { FT_Tag tag, ltag; FT_ULong ptr; Script_Item *entry; } Script_Record; typedef struct { FT_UShort count; FT_UShort *list; } Feature_Item; typedef struct { FT_Tag tag; FT_ULong ptr; Feature_Item *entry; } Feature_Record; tagsParse(FT_Face f) : face(f) {} ~tagsParse() { reset(); } void reset() { if (Table || TABLE_length || TABLE_ptr) { free(Table); Table nullptr; TABLE_length 0; TABLE_ptr 0; } if (Script_List || Script_Count) { free(Script_List); Script_List nullptr; Script_Count 0; } if (Feature_List || Feature_Count) { free(Feature_List); Feature_List nullptr; Feature_Count 0; } } inline void need(FT_ULong needed) { if (TABLE_ptr needed TABLE_length) printf(GSUB: Unexpected end of table.); } inline FT_Byte get_Byte(void) { return Table[TABLE_ptr]; } inline signed char get_SByte(void) { return (signed char)Table[TABLE_ptr]; } FT_UShort get_UShort(void) { unsigned int cc; cc get_Byte() 8; cc | get_Byte(); return (FT_UShort)cc; } FT_Short get_Short(void) { int cc; cc get_SByte() 8; cc | get_Byte(); return (FT_Short)cc; } FT_ULong get_ULong(void) { unsigned int cc; cc get_Byte() 24; cc | get_Byte() 16; cc | get_Byte() 8; cc | get_Byte(); return (FT_ULong)cc; } void *mymalloc(size_t len) { void *p; #ifdef SMALLMALLOC if (len 65500L) printf(Cannot allocate more than 64kByte.); #endif if (len) p malloc(len); else p malloc(1); if (p NULL) printf(Out of memory.); return p; } void *mycalloc(size_t nmemb, size_t len) { void *p; p calloc(nmemb ? nmemb : 1, len ? len : 1); if (p NULL) printf(Out of memory.); return p; } void gsub(void) { reset(); FT_Error error; /* * Fetch GSUB table */ if ((error FT_Load_Sfnt_Table(face, FT_MAKE_TAG(G, S, U, B), 0, NULL, TABLE_length))) { #ifdef DEBUG warning(No GSUB data available for vertical glyph presentation forms.); #endif return; } Table (FT_Byte *)mymalloc(TABLE_length); // std::shared_ptrvoid finally(nullptr, [Table](void *p) { free(Table); }); // 退出时自动销毁缓存 if ((error FT_Load_Sfnt_Table(face, FT_MAKE_TAG(G, S, U, B), 0, Table, TABLE_length))) { printf(Cannot load GSUB table (error code 0x%x)., error); return; } fetch_table(Table, TABLE_length); } void gpos(void) { reset(); FT_Error error; /* * Fetch GSUB table */ if ((error FT_Load_Sfnt_Table(face, FT_MAKE_TAG(G, P, O, S), 0, NULL, TABLE_length))) { #ifdef DEBUG warning(No GSUB data available for vertical glyph presentation forms.); #endif return; } Table (FT_Byte *)mymalloc(TABLE_length); // std::shared_ptrvoid finally(nullptr, [Table](void *p) { free(Table); }); // 退出时自动销毁缓存 if ((error FT_Load_Sfnt_Table(face, FT_MAKE_TAG(G, P, O, S), 0, Table, TABLE_length))) { printf(Cannot load GSUB table (error code 0x%x)., error); return; } fetch_table(Table, TABLE_length); } void fetch_table(FT_Byte *Table, FT_ULong TABLE_length) { FT_Error error; int i, j; FT_ULong Script_List_ptr, Feature_List_ptr, Lookup_List_ptr; /* * Read GSUB header */ need(10); if (get_ULong() ! 0x00010000) printf(GSUB: Bad version.); Script_List_ptr get_UShort(); Feature_List_ptr get_UShort(); Lookup_List_ptr get_UShort(); /* * Read Script_List */ TABLE_ptr Script_List_ptr; need(2); Script_Count get_UShort(); #ifdef DEBUG warning(GSUB: Script List with %d entries at 0x%04x., Script_Count, Script_List_ptr); #endif Script_List (Script_Record *)mycalloc(Script_Count, sizeof(Script_Record)); need(6 * Script_Count); for (i 0; i Script_Count; i) { FT_Tag tag get_ULong(); FT_ULong ptr Script_List_ptr get_UShort(); for (j 0; j num_Script_Lang; j) if (tag Script_Lang[j].script) { Script_List[i].tag tag; Script_List[i].ltag Script_Lang[j].language; Script_List[i].ptr ptr; } } /* * Read Feature_List */ TABLE_ptr Feature_List_ptr; need(2); Feature_Count get_UShort(); #ifdef DEBUG warning(GSUB: Feature List with %d entries at 0x%04x., Feature_Count, Feature_List_ptr); #endif Feature_List (Feature_Record *)mycalloc(Feature_Count, sizeof(Feature_Record)); need(6 * Feature_Count); for (i 0; i Feature_Count; i) { FT_Tag tag get_ULong(); FT_ULong ptr Feature_List_ptr get_UShort(); // char a (tag 24) 0xFF; // char b (tag 16) 0xFF; // char c (tag 8) 0xFF; // char d tag 0xFF; tags.insert(tag); } } public: FT_Face face nullptr; FT_ULong Script_List_ptr 0; FT_ULong Feature_List_ptr 0; FT_ULong Lookup_List_ptr 0; FT_ULong TABLE_ptr 0; Script_Record *Script_List nullptr; FT_UShort Script_Count 0; Feature_Record *Feature_List nullptr; FT_UShort Feature_Count 0; FT_ULong TABLE_length 0; FT_Byte *Table nullptr; std::setFT_Tag tags; }; TagsParse parse(face); parse.gsub(); parse.gpos(); parse.tags;Harfbuzz#include hb-ft.h hb_font_t *hb_font hb_ft_font_create(face, NULL); hb_face_t *hb_face hb_ft_face_create_referenced(face); std::setstd::string curFeatSet; for (hb_tag_t table_tag : {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS}) { unsigned int feature_count hb_ot_layout_table_get_feature_tags(hb_face, table_tag, 0, nullptr, nullptr); std::vectorhb_tag_t feature_tags(feature_count); hb_ot_layout_table_get_feature_tags(hb_face, table_tag, 0, feature_count, feature_tags.data()); for (hb_tag_t feature_tag : feature_tags) { char tag_str[5] {0}; hb_tag_to_string(feature_tag, tag_str); curFeatSet.insert(tag_str); } curFeatSet.insert(curFeatSet.begin(), curFeatSet.end()); } hb_face_destroy(face); hb_font_destroy(hb_font);输出fontFeatures: [ aalt, calt, case, ccmp, cpsp, cv01, cv02, cv03, cv04, cv05, cv06, cv07, cv08, cv09, cv10, cv11, dlig, dnom, frac, kern, locl, mark, numr, ordn, pnum, salt, sinf, ss01, ss02, ss03, ss04, subs, sups, tnum, zero ]参考Registered features (OpenType 1.9.1) - Typography | Microsoft LearnC字体库开发之字体包解析十二-CSDN博客texlive/texk/ttf2pk2/ftlib.c at f1f3f83ecefcf1e03bc7c3616aa95e3a8f63396b · Distrotech/texlive · GitHubtexlive-source/texk/ttf2pk2/ftlib.c at 9e55052ce4db6d978ae8190b9e9ec021e5bd50ad · TeX-Live/texlive-source · GitHub创作不易小小的支持一下吧