diff options
Diffstat (limited to 'source/blender/blenfont/intern/blf_thumbs.c')
-rw-r--r-- | source/blender/blenfont/intern/blf_thumbs.c | 421 |
1 files changed, 357 insertions, 64 deletions
diff --git a/source/blender/blenfont/intern/blf_thumbs.c b/source/blender/blenfont/intern/blf_thumbs.c index cba4bb96f73..8ad880edf30 100644 --- a/source/blender/blenfont/intern/blf_thumbs.c +++ b/source/blender/blenfont/intern/blf_thumbs.c @@ -8,16 +8,20 @@ * Isolate since this needs to be called by #ImBuf code (bad level call). */ -#include <stdio.h> #include <stdlib.h> -#include <string.h> #include <ft2build.h> #include FT_FREETYPE_H +#include FT_ADVANCES_H /* For FT_Get_Advance */ +#include FT_TRUETYPE_IDS_H /* Codepoint coverage constants. */ +#include FT_TRUETYPE_TABLES_H /* For TT_OS2 */ #include "BLI_listbase.h" +#include "BLI_math_bits.h" #include "BLI_rect.h" +#include "BLI_string.h" +#include "BLI_string_utf8.h" #include "BLI_threads.h" #include "BLI_utildefines.h" @@ -25,89 +29,378 @@ #include "blf_internal_types.h" #include "BLF_api.h" -#include "BLT_translation.h" #include "BLI_strict_flags.h" -void BLF_thumb_preview(const char *filepath, - const char **draw_str, - const char **i18n_draw_str, - const uchar draw_str_lines, - const float font_color[4], - const int font_size, - uchar *buf, - const int w, - const int h, - const int channels) +/* Maximum length of text sample in char32_t, including NULL terminator. */ +#define BLF_SAMPLE_LEN 5 + +typedef struct UnicodeSample { + char32_t sample[BLF_SAMPLE_LEN]; + char field; /* ‘OS/2’ table ulUnicodeRangeX field (1-4). */ + long mask; /* ‘OS/2’ table ulUnicodeRangeX bit mask. */ +} UnicodeSample; + +/* The seemingly arbitrary order that follows is to help quickly find the most-likely designed + * intent of the font. Many feature-specific fonts contain Latin, Greek, & Coptic characters so + * those need to be checked last. */ +static const UnicodeSample unicode_samples[] = { + /* Chinese, Japanese, Korean, ordered specific to general. */ + {U"\uc870\uc120\uae00", 2, TT_UCR_HANGUL}, /* 조선글 */ + {U"\u3042\u30a2\u4e9c", 2, TT_UCR_HIRAGANA}, /* あア亜 */ + {U"\u30a2\u30a4\u4e9c", 2, TT_UCR_KATAKANA}, /* アイ亜 */ + {U"\u1956\u195b\u1966", 3, TT_UCR_TAI_LE}, /* ᥖᥛᥦ */ + {U"\u3105\u3106\u3107", 2, TT_UCR_BOPOMOFO}, /* ㄅㄆㄇ */ + {U"\ua840\ua841\ua85d", 2, TT_UCR_PHAGSPA}, /* ꡀꡁꡝ */ + {U"\u5e03\u4e01\u4f53", 2, TT_UCR_CJK_UNIFIED_IDEOGRAPHS}, /* 布丁体 */ + /* Languages in the BMP with a coverage bit. */ + {U"\u05d0\u05da\u05e4", 1, TT_UCR_HEBREW}, + {U"\ua500\ua502\ua549", 1, TT_UCR_VAI}, + {U"\ufee6\ufef4\ufeb3", 1, TT_UCR_ARABIC}, + {U"\u07C1\u07C2\u07C3", 1, TT_UCR_NKO}, + {U"\u0905\u093f\u092a", 1, TT_UCR_DEVANAGARI}, + {U"\u0986\u0987\u098c", 1, TT_UCR_BENGALI}, + {U"\u0a05\u0a16\u0a30", 1, TT_UCR_GURMUKHI}, + {U"\u0aaa\u0aaf\u0ab8", 1, TT_UCR_GUJARATI}, + {U"\u0b2a\u0b30\u0b37", 1, TT_UCR_ORIYA}, + {U"\u0b85\u0b88\u0b8f", 1, TT_UCR_TAMIL}, + {U"\u0c05\u0c0c\u0c36", 1, TT_UCR_TELUGU}, + {U"\u0c85\u0c87\u0c8e", 1, TT_UCR_KANNADA}, + {U"\u0d05\u0d09\u0d3d", 1, TT_UCR_MALAYALAM}, + {U"\u0e05\u0e06\u0e07", 1, TT_UCR_THAI}, + {U"\u0e81\u0e82\u0e84", 1, TT_UCR_LAO}, + {U"\u10a0\u10a1\u10a2", 1, TT_UCR_GEORGIAN}, + {U"\u1B05\u1B07\u1B09", 1, TT_UCR_BALINESE}, + {U"\u0f00\u0f04\u0f08", 3, TT_UCR_TIBETAN}, + {U"\u0710\u0717\u071c", 3, TT_UCR_SYRIAC}, + {U"\u0784\u0783\u0798", 3, TT_UCR_THAANA}, + {U"\u0d85\u0d89\u0daf", 3, TT_UCR_SINHALA}, + {U"\u1000\u1001\u1014", 3, TT_UCR_MYANMAR}, + {U"\u1202\u1207\u1250", 3, TT_UCR_ETHIOPIC}, + {U"\u13a3\u13a4\u13a8", 3, TT_UCR_CHEROKEE}, + {U"\u1401\u144d\u156e", 3, TT_UCR_CANADIAN_ABORIGINAL_SYLLABICS}, + {U"\u1681\u1687\u168b", 3, TT_UCR_OGHAM}, + {U"\u16A0\u16A4\u16AA", 3, TT_UCR_RUNIC}, + {U"\u1780\u1781\u1783", 3, TT_UCR_KHMER}, + {U"\u1820\u1826\u1845", 3, TT_UCR_MONGOLIAN}, + {U"\ua188\ua320\ua4bf", 3, TT_UCR_YI}, + {U"\u1900\u1901\u1902", 3, TT_UCR_LIMBU}, + {U"\u1950\u1951\u1952", 3, TT_UCR_TAI_LE}, + {U"\u1980\u1982\u1986", 3, TT_UCR_NEW_TAI_LUE}, + {U"\u1A00\u1A01\u1A02", 4, TT_UCR_BUGINESE}, + {U"\u2c01\u2c05\u2c0c", 4, TT_UCR_GLAGOLITIC}, + {U"\u2d31\u2d33\u2d37", 4, TT_UCR_TIFINAGH}, + {U"\u2d31\u2d33\u2d37", 4, TT_UCR_YIJING}, + {U"\u1B83\u1B84\u1B88", 4, TT_UCR_SUNDANESE}, + {U"\u1C00\u1C01\u1C02", 4, TT_UCR_LEPCHA}, + {U"\u1C50\u1C51\u1C52", 4, TT_UCR_OL_CHIKI}, + {U"\uA800\uA801\uA805", 4, TT_UCR_SYLOTI_NAGRI}, + {U"\uA882\uA88a\uA892", 4, TT_UCR_SAURASHTRA}, + {U"\uA901\uA902\uA904", 4, TT_UCR_KAYAH_LI}, + {U"\uA930\uA932\uA943", 4, TT_UCR_REJANG}, + {U"\uaa00\uaa02\uaa05", 4, TT_UCR_CHAM}, + /* Indexed languages in the Supplementary Multilingual Plane. */ + {U"\U00010000\U00010001\U00010002", 4, TT_UCR_LINEAR_B}, + {U"\U00010300\U00010301\U00010302", 3, TT_UCR_OLD_ITALIC}, + {U"\U00010330\U00010331\U00010332", 3, TT_UCR_GOTHIC}, + {U"\U00010380\U00010381\U00010382", 4, TT_UCR_UGARITIC}, + {U"\U000103A0\U000103A1\U000103A2", 4, TT_UCR_OLD_PERSIAN}, + {U"\U00010400\U00010401\U00010402", 3, TT_UCR_DESERET}, + {U"\U00010450\U00010451\U00010452", 4, TT_UCR_SHAVIAN}, + {U"\U00010480\U00010481\U00010482", 4, TT_UCR_OSMANYA}, + {U"\U00010800\U00010803\U00010805", 4, TT_UCR_CYPRIOT_SYLLABARY}, + {U"\U00010900\U00010901\U00010902", 2, TT_UCR_PHOENICIAN}, + {U"\U00010A10\U00010A11\U00010A12", 4, TT_UCR_KHAROSHTHI}, + {U"\U00012000\U00012001\U00012002", 4, TT_UCR_CUNEIFORM}, + /* Philippine languages use a single OS2 coverage bit. */ + {U"\u1700\u1701\u1702", 3, TT_UCR_PHILIPPINE}, /* Tagalog */ + {U"\u1720\u1721\u1722", 3, TT_UCR_PHILIPPINE}, /* Hanunoo */ + {U"\u1740\u1741\u1742", 3, TT_UCR_PHILIPPINE}, /* Buhid */ + {U"\u1760\u1761\u1762", 3, TT_UCR_PHILIPPINE}, /* Tagbanwa */ + /* Anatolian languages use a single OS2 coverage bit. */ + {U"\U000102A3\U000102A8\U000102CB", 4, TT_UCR_OLD_ANATOLIAN}, /* Carian */ + {U"\U00010280\U00010281\U00010282", 4, TT_UCR_OLD_ANATOLIAN}, /* Lycian */ + {U"\U00010920\U00010921\U00010922", 4, TT_UCR_OLD_ANATOLIAN}, /* Lydian */ + /* Symbol blocks. */ + {U"\U0001f600\U0001f638", 0, 0}, /* Emoticons 😀😸 */ + {U"\uf021\uf022\uf023", 0, 0}, /* MS Symbols */ + {U"\u280f\u2815\u283f", 3, TT_UCR_BRAILLE}, + {U"\U0001D11e\U0001D161\U0001D130", 3, TT_UCR_MUSICAL_SYMBOLS}, + {U"\u2700\u2708\u2709", 2, TT_UCR_DINGBATS}, + {U"\u2600\u2601\u2602", 2, TT_UCR_MISCELLANEOUS_SYMBOLS}, + {U"\ue000\ue001\ue002", 2, TT_UCR_PRIVATE_USE}, + {U"\ue702\ue703\ue704", 2, TT_UCR_PRIVATE_USE}, + {U"\U000F0001\U000F0002\U000F0003", 2, TT_UCR_PRIVATE_USE_SUPPLEMENTARY}, + /* Languages in the Supplementary Multilingual Plane. */ + {U"\U00010350\U00010352\U00010353", 2, TT_UCR_NON_PLANE_0}, /* Old Permic */ + {U"\U000104B0\U000104B6\U000104B8", 2, TT_UCR_NON_PLANE_0}, /* Osage */ + {U"\U00010500\U00010501\U00010502", 2, TT_UCR_NON_PLANE_0}, /* Elbasan */ + {U"\U00010530\U00010531\U00010532", 2, TT_UCR_NON_PLANE_0}, /* Caucasian Albanian */ + {U"\U00010600\U00010601\U00010602", 2, TT_UCR_NON_PLANE_0}, /* Linear A */ + {U"\U00010840\U00010841\U00010842", 2, TT_UCR_NON_PLANE_0}, /* Imperial Aramaic */ + {U"\U00010860\U00010861\U00010862", 2, TT_UCR_NON_PLANE_0}, /* Palmyrene */ + {U"\U00010880\U00010881\U00010882", 2, TT_UCR_NON_PLANE_0}, /* Nabataean */ + {U"\U000108E0\U000108E3\U000108E4", 2, TT_UCR_NON_PLANE_0}, /* Hatran */ + {U"\U00010980\U00010983\U00010989", 2, TT_UCR_NON_PLANE_0}, /* Meroitic Hieroglyphs */ + {U"\U000109A0\U000109A1\U000109A2", 2, TT_UCR_NON_PLANE_0}, /* Meroitic Cursive */ + {U"\U00010A60\U00010A61\U00010A62", 2, TT_UCR_NON_PLANE_0}, /* Old South Arabian */ + {U"\U00010A80\U00010A81\U00010A82", 2, TT_UCR_NON_PLANE_0}, /* Old North Arabian */ + {U"\U00010ac0\U00010ac3\U00010ac6", 2, TT_UCR_NON_PLANE_0}, /* Manichaean */ + {U"\U00010B00\U00010B04\U00010B08", 2, TT_UCR_NON_PLANE_0}, /* Avestan */ + {U"\U00010B40\U00010B41\U00010B42", 2, TT_UCR_NON_PLANE_0}, /* Inscriptional Parthian */ + {U"\U00010B60\U00010B61\U00010B62", 2, TT_UCR_NON_PLANE_0}, /* Inscriptional Pahlavi */ + {U"\U00010B80\U00010B84\U00010B87", 2, TT_UCR_NON_PLANE_0}, /* Psalter Pahlavi */ + {U"\U00010C00\U00010C01\U00010C02", 2, TT_UCR_NON_PLANE_0}, /* Old Turkic */ + {U"\U00010C80\U00010C81\U00010C82", 2, TT_UCR_NON_PLANE_0}, /* Old Hungarian */ + {U"\U00010D00\U00010D07\U00010D0D", 2, TT_UCR_NON_PLANE_0}, /* Hanifi Rohingya */ + {U"\U00010E80\U00010E81\U00010E82", 2, TT_UCR_NON_PLANE_0}, /* Yezidi */ + {U"\U00010F00\U00010F01\U00010F02", 2, TT_UCR_NON_PLANE_0}, /* Old Sogdian */ + {U"\U00010F30\U00010F32\U00010F34", 2, TT_UCR_NON_PLANE_0}, /* Sogdian */ + {U"\U00010F70\U00010F71\U00010F72", 2, TT_UCR_NON_PLANE_0}, /* Old Uyghur */ + {U"\U00010FB0\U00010FB1\U00010FB2", 2, TT_UCR_NON_PLANE_0}, /* Chorasmian */ + {U"\U00010FE0\U00010FE1\U00010FE2", 2, TT_UCR_NON_PLANE_0}, /* Elymaic */ + {U"\U00011003\U00011004\U00011005", 2, TT_UCR_NON_PLANE_0}, /* Brahmi */ + {U"\U00011083\U00011085\U00011087", 2, TT_UCR_NON_PLANE_0}, /* Kaithi */ + {U"\U000110D0\U000110D1\U000110D2", 2, TT_UCR_NON_PLANE_0}, /* Sora Sompeng */ + {U"\U00011103\U00011104\U00011105", 2, TT_UCR_NON_PLANE_0}, /* Chakma */ + {U"\U00011150\U00011151\U00011152", 2, TT_UCR_NON_PLANE_0}, /* Mahajani */ + {U"\U00011183\U00011185\U0001118b", 2, TT_UCR_NON_PLANE_0}, /* Sharada */ + {U"\U00011200\U00011201\U00011202", 2, TT_UCR_NON_PLANE_0}, /* Khojki */ + {U"\U00011280\U00011281\U00011282", 2, TT_UCR_NON_PLANE_0}, /* Multani */ + {U"\U000112B0\U000112B2\U000112B4", 2, TT_UCR_NON_PLANE_0}, /* Khudawadi */ + {U"\U00011305\U00011309\U0001130b", 2, TT_UCR_NON_PLANE_0}, /* Grantha */ + {U"\U00011400\U00011404\U00011409", 2, TT_UCR_NON_PLANE_0}, /* Newa */ + {U"\U00011480\U00011481\U00011482", 2, TT_UCR_NON_PLANE_0}, /* Tirhuta */ + {U"\U00011580\U00011582\U00011589", 2, TT_UCR_NON_PLANE_0}, /* Siddham */ + {U"\U00011600\U00011604\U00011609", 2, TT_UCR_NON_PLANE_0}, /* Modi */ + {U"\U00011680\U00011682\U0001168A", 2, TT_UCR_NON_PLANE_0}, /* Takri */ + {U"\U00011700\U00011701\U00011702", 2, TT_UCR_NON_PLANE_0}, /* Ahom */ + {U"\U00011800\U00011801\U00011802", 2, TT_UCR_NON_PLANE_0}, /* Dogri */ + {U"\U000118A0\U000118A1\U000118AA", 2, TT_UCR_NON_PLANE_0}, /* Warang Citi */ + {U"\U00011900\U00011901\U00011902", 2, TT_UCR_NON_PLANE_0}, /* Dives Akuru */ + {U"\U00011A00\U00011A10\U00011A15", 2, TT_UCR_NON_PLANE_0}, /* Zanabazar Square */ + {U"\U00011A50\U00011A5C\U00011A6B", 2, TT_UCR_NON_PLANE_0}, /* Soyombo */ + {U"\U00011AC0\U00011AC1\U00011AC2", 2, TT_UCR_NON_PLANE_0}, /* Pau Cin Hau */ + {U"\U00011C00\U00011C01\U00011C02", 2, TT_UCR_NON_PLANE_0}, /* Bhaiksuki */ + {U"\U00011C70\U00011C71\U00011C72", 2, TT_UCR_NON_PLANE_0}, /* Marchen */ + {U"\U00011D00\U00011D02\U00011D08", 2, TT_UCR_NON_PLANE_0}, /* Masaram Gondi */ + {U"\U00011D60\U00011D62\U00011D6c", 2, TT_UCR_NON_PLANE_0}, /* Gunjala Gondi */ + {U"\U00011FC1\U00011FC2\U00011FC8", 2, TT_UCR_NON_PLANE_0}, /* Tamil Supplement */ + {U"\U00012F90\U00012F91\U00012F92", 2, TT_UCR_NON_PLANE_0}, /* Cypro-Minoan */ + {U"\U00013000\U00013076\U0001307f", 2, TT_UCR_NON_PLANE_0}, /* Egyptian Hieroglyphs */ + {U"\U00014400\U00014409\U00014447", 2, TT_UCR_NON_PLANE_0}, /* Anatolian Hieroglyphs */ + {U"\U00016A40\U00016A41\U00016A42", 2, TT_UCR_NON_PLANE_0}, /* Mro */ + {U"\U00016A70\U00016A71\U00016A72", 2, TT_UCR_NON_PLANE_0}, /* Tangsa */ + {U"\U00016AD0\U00016AD2\U00016ADA", 2, TT_UCR_NON_PLANE_0}, /* Bassa Vah */ + {U"\U00016B00\U00016B01\U00016B02", 2, TT_UCR_NON_PLANE_0}, /* Pahawh Hmong */ + {U"\U00016F01\U00016F05\U00016F09", 2, TT_UCR_NON_PLANE_0}, /* Miao */ + {U"\U0001BC19\U0001BC1f\U0001BC0e", 2, TT_UCR_NON_PLANE_0}, /* Duployan */ + {U"\U0001D2E0\U0001D2E6\U0001D2f3", 2, TT_UCR_NON_PLANE_0}, /* Mayan Numerals */ + {U"\U0001E800\U0001E80A\U0001E80F", 2, TT_UCR_NON_PLANE_0}, /* Mende Kikakui */ + {U"\U0001E900\U0001E902\U0001E907", 2, TT_UCR_NON_PLANE_0}, /* Adlam */ + {U"\U0001E2C0\U0001E2C2\U0001E2C7", 2, TT_UCR_NON_PLANE_0}, /* Wancho */ + {U"\U0001EC71\U0001EC72\U0001EC73", 2, TT_UCR_NON_PLANE_0}, /* Indic Siyaq Numbers */ + /* Basic Multilingual Plane but are not indexed with an OS2 coverage bit. */ + {U"\u0638\u0630\u0633", 0, 0}, /* Urdu */ + {U"\u0800\u0801\u0802", 0, 0}, /* Samaritan */ + {U"\u0841\u0842\u084c", 0, 0}, /* Mandaic */ + {U"\u1A20\u1A21\u1A22", 0, 0}, /* Tai Tham */ + {U"\u1BC0\u1BC1\u1BC2", 0, 0}, /* Batak */ + {U"\uA4EF\uA4E8\uA4ED", 0, 0}, /* Lisu */ + {U"\uA6A0\uA6A1\uA6A2", 0, 0}, /* Bamum */ + {U"\ua983\ua984\ua98d", 0, 0}, /* Javanese */ + {U"\uaa80\uaa81\uaa82", 0, 0}, /* Tai Viet */ + {U"\uABC0\uABC1\uABC2", 0, 0}, /* Meetei Mayek */ + /* Near the end since many fonts contain these. */ + {U"\u03e2\u03e4\u03e8", 1, TT_UCR_COPTIC}, + {U"\u1f08\u03a6\u03a8", 1, TT_UCR_GREEK}, + {U"\u0518\u0409\u040f", 1, TT_UCR_CYRILLIC}, + {U"\u0533\u0537\u0539", 1, TT_UCR_ARMENIAN}, +}; + +static const char32_t *blf_get_sample_text(FT_Face face) { - const int font_size_min = 6; - int font_size_curr; - /* shrink 1/th each line */ - int font_shrink = 4; + /* First check for fonts with MS Symbol character map. */ + if (face->charmap->encoding == FT_ENCODING_MS_SYMBOL) { + /* Many of these have characters starting from F020. */ + if (FT_Get_Char_Index(face, U'\uf041') != 0) { + return U"\uf041\uf044\uf048"; + } + if (FT_Get_Char_Index(face, U'\uf030') != 0) { + return U"\uf030\uf031\uf032"; + } + return U"ADH"; + } - /* While viewing thumbnails in font directories this function can be called simultaneously from a - * greater number of threads than we want the FreeType cache to keep open at a time. Therefore - * pass own FT_Library to font creation so that it is not managed by the FreeType cache system. - */ + const char32_t *def = U"Aabg"; + const char32_t *sample = def; - FT_Library ft_library = NULL; - if (FT_Init_FreeType(&ft_library) != FT_Err_Ok) { - return; + /* Fonts too old to have a Unicode character map. */ + if (face->charmap->encoding != FT_ENCODING_UNICODE) { + return def; } - FontBLF *font = blf_font_new_ex("thumb_font", filepath, NULL, 0, ft_library); - if (!font) { - printf("Info: Can't load font '%s', no preview possible\n", filepath); - FT_Done_FreeType(ft_library); - return; + /* TrueType table with bits to quickly test most Unicode block coverage. */ + TT_OS2 *os2_table = (TT_OS2 *)FT_Get_Sfnt_Table(face, FT_SFNT_OS2); + if (!os2_table) { + return def; + } + + /* Detect "Last resort" fonts. They have everything, except the last 5 bits. */ + if (os2_table->ulUnicodeRange1 == 0xffffffffU && os2_table->ulUnicodeRange2 == 0xffffffffU && + os2_table->ulUnicodeRange3 == 0xffffffffU && os2_table->ulUnicodeRange4 >= 0x7FFFFFFU) { + return U"\xE000\xFFFF"; + } + + int language_count = count_bits_i((uint)os2_table->ulUnicodeRange1) + + count_bits_i((uint)os2_table->ulUnicodeRange2) + + count_bits_i((uint)os2_table->ulUnicodeRange3) + + count_bits_i((uint)os2_table->ulUnicodeRange4); + + for (uint i = 0; i < ARRAY_SIZE(unicode_samples); ++i) { + UnicodeSample s = unicode_samples[i]; + if (os2_table && s.field && s.mask) { + /* OS/2 Table contains 4 contiguous integers of script coverage bit flags. */ + FT_ULong *field = &(os2_table->ulUnicodeRange1) + (s.field - 1); + if (!(*field & (FT_ULong)s.mask)) { + continue; + } + } + if (FT_Get_Char_Index(face, s.sample[0]) != 0) { + sample = s.sample; + break; + } } - /* Would be done via the BLF API, but we're not using a fontid here */ - font->buf_info.cbuf = buf; - font->buf_info.ch = channels; - font->buf_info.dims[0] = w; - font->buf_info.dims[1] = h; + bool has_latin = (os2_table && (os2_table->ulUnicodeRange1 & TT_UCR_BASIC_LATIN) && + (FT_Get_Char_Index(face, U'A') != 0)); + bool has_cjk = (os2_table && (os2_table->ulUnicodeRange2 & TT_UCR_CJK_UNIFIED_IDEOGRAPHS)); - /* Always create the image with a white font, - * the caller can theme how it likes */ - memcpy(font->buf_info.col_init, font_color, sizeof(font->buf_info.col_init)); - font->pos[1] = h; + if (has_latin && ((has_cjk && language_count > 40) || (!has_cjk && language_count > 5))) { + return def; + } - font_size_curr = font_size; + return sample; +} - blf_draw_buffer__start(font); +bool BLF_thumb_preview( + const char *filename, unsigned char *buf, int w, int h, int UNUSED(channels)) +{ + /* Use own FT_Library and direct FreeType calls as this is called from multiple threads. */ + FT_Library ft_lib = NULL; + if (FT_Init_FreeType(&ft_lib) != FT_Err_Ok) { + return false; + } - for (int i = 0; i < draw_str_lines; i++) { - const char *draw_str_i18n = i18n_draw_str[i] != NULL ? i18n_draw_str[i] : draw_str[i]; - const size_t draw_str_i18n_len = strlen(draw_str_i18n); - int draw_str_i18_count = 0; + FT_Face face; + if (FT_New_Face(ft_lib, filename, 0, &face) != FT_Err_Ok) { + FT_Done_FreeType(ft_lib); + return false; + } - CLAMP_MIN(font_size_curr, font_size_min); - if (!blf_font_size(font, (float)font_size_curr)) { - break; + if (!(face->face_flags & FT_FACE_FLAG_SCALABLE)) { + return false; + } + + FT_Error err = FT_Select_Charmap(face, FT_ENCODING_UNICODE); + if (err) { + err = FT_Select_Charmap(face, FT_ENCODING_MS_SYMBOL); + } + if (err) { + err = FT_Select_Charmap(face, FT_ENCODING_APPLE_ROMAN); + } + if (err && face->num_charmaps > 0) { + err = FT_Select_Charmap(face, face->charmaps[0]->encoding); + } + if (err != FT_Err_Ok) { + FT_Done_Face(face); + FT_Done_FreeType(ft_lib); + return false; + } + + const char32_t *codepoints = blf_get_sample_text(face); + uint glyph_ids[BLF_SAMPLE_LEN] = {0}; + + /* A large initial font size for measuring. Nothing will be rendered this size. */ + if (FT_Set_Char_Size(face, w * 64, 0, 72, 72) != FT_Err_Ok) { + FT_Done_Face(face); + FT_Done_FreeType(ft_lib); + return false; + } + + /* Approximate length of the sample. Uses only advances, ignores bearings. */ + int width = 0; + for (uint i = 0; i < BLF_SAMPLE_LEN && codepoints[i]; i++) { + glyph_ids[i] = FT_Get_Char_Index(face, codepoints[i]); + /* If sample glyph is not found, use another. */ + if (!glyph_ids[i]) { + glyph_ids[i] = (uint)(face->num_glyphs / (BLF_SAMPLE_LEN + 1)) * (i + 1); } + /* Get advance without loading the glyph. */ + FT_Fixed advance; + FT_Get_Advance(face, glyph_ids[i], FT_LOAD_NO_HINTING, &advance); + /* Advance is returned in 16.16 format, so divide by 65536 for pixels. */ + width += (int)(advance >> 16); + } + + int height = ft_pix_to_int((ft_pix)face->size->metrics.ascender - + (ft_pix)face->size->metrics.descender); + width = MAX2(width, height); + + /* Fill up to 96% horizontally or vertically. */ + float font_size = MIN3((float)w, + ((float)w * 0.96f / (float)width * (float)w), + (float)h * 0.96f / (float)height * (float)h); - /* decrease font size each time */ - font_size_curr -= (font_size_curr / font_shrink); - font_shrink += 1; + if (font_size < 1 || FT_Set_Char_Size(face, (int)(font_size * 64.0f), 0, 72, 72) != FT_Err_Ok) { + /* Sizing can fail, but very rarely. */ + FT_Done_Face(face); + FT_Done_FreeType(ft_lib); + return false; + } + + /* Horizontally center, line up baselines vertically. */ + int left = (int)(((float)w - ((float)width * (font_size / (float)w))) / 2.0f); + int top = (int)((float)h * 0.7f); + + /* Print out to buffer. */ - font->pos[1] -= (int)((float)blf_font_ascender(font) * 1.1f); + FT_Pos advance_x = 0; + int glyph_count = 0; /* How many are successfully loaded and rendered. */ - /* We fallback to default English strings in case not enough chars are available in current - * font for given translated string (useful in non-Latin i18n context, like Chinese, - * since many fonts will then show nothing but ugly 'missing char' in their preview). - * Does not handle all cases, but much better than nothing. - */ - if (blf_font_count_missing_chars(font, draw_str_i18n, draw_str_i18n_len, &draw_str_i18_count) > - (draw_str_i18_count / 2)) { - blf_font_draw_buffer(font, draw_str[i], strlen(draw_str[i]), NULL); + for (int i = 0; i < BLF_SAMPLE_LEN && glyph_ids[i]; i++) { + if (FT_Load_Glyph(face, glyph_ids[i], FT_LOAD_TARGET_NORMAL | FT_LOAD_NO_HINTING) != + FT_Err_Ok) { + break; } - else { - blf_font_draw_buffer(font, draw_str_i18n, draw_str_i18n_len, NULL); + + if (FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL) != FT_Err_Ok || + face->glyph->format != FT_GLYPH_FORMAT_BITMAP) { + break; } + + glyph_count++; + + for (int y = 0; y < (int)face->glyph->bitmap.rows; y++) { + int dest_row = (h - y - 1 + (int)face->glyph->bitmap_top - top); + if (dest_row >= 0 && dest_row < h) { + for (int x = 0; x < (int)face->glyph->bitmap.width; x++) { + int dest_col = (x + ft_pix_to_int((ft_pix)advance_x) + face->glyph->bitmap_left + left); + if (dest_col >= 0 && dest_col < w) { + uchar *source = &face->glyph->bitmap.buffer[y * (int)face->glyph->bitmap.width + x]; + uchar *dest = &buf[dest_row * w * 4 + (dest_col * 4 + 3)]; + *dest = (uchar)MIN2(((uint)*dest + (uint)*source), 255u); + } + } + } + } + + advance_x += face->glyph->advance.x; } - blf_draw_buffer__end(); - blf_font_free(font); - FT_Done_FreeType(ft_library); + FT_Done_Face(face); + FT_Done_FreeType(ft_lib); + + /* Return success if we printed at least one glyph. */ + return glyph_count > 0; } |