e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
428 lines
19 KiB
C++
428 lines
19 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
|
|
/** \file
|
|
* \ingroup blf
|
|
*
|
|
* Utility function to generate font preview images.
|
|
*
|
|
* Isolate since this needs to be called by #ImBuf code (bad level call).
|
|
*/
|
|
|
|
#include <cstdlib>
|
|
|
|
#include <ft2build.h>
|
|
|
|
#include FT_FREETYPE_H
|
|
#include FT_ADVANCES_H /* For FT_Get_Advance */
|
|
#include FT_TRUETYPE_IDS_H /* Code-point 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"
|
|
|
|
#include "blf_internal.h"
|
|
#include "blf_internal_types.h"
|
|
|
|
#include "BLF_api.h"
|
|
|
|
#include "BLI_strict_flags.h"
|
|
|
|
/* Maximum length of text sample in char32_t, including nullptr terminator. */
|
|
#define BLF_SAMPLE_LEN 5
|
|
|
|
struct UnicodeSample {
|
|
char32_t sample[BLF_SAMPLE_LEN];
|
|
int field; /* 'OS/2' table ulUnicodeRangeX field (1-4). */
|
|
FT_ULong mask; /* 'OS/2' table ulUnicodeRangeX bit mask. */
|
|
};
|
|
|
|
/* 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"\ud55c\uad6d\uc5b4", 2, TT_UCR_HANGUL}, /* 한국어 */
|
|
{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, (FT_ULong)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)
|
|
{
|
|
/* 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";
|
|
}
|
|
|
|
const char32_t *def = U"Aabg";
|
|
const char32_t *sample = def;
|
|
|
|
/* Fonts too old to have a Unicode character map. */
|
|
if (face->charmap->encoding != FT_ENCODING_UNICODE) {
|
|
return def;
|
|
}
|
|
|
|
/* 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));
|
|
|
|
/* Use OS/2 Table code page range bits to differentiate between (combined) CJK fonts.
|
|
* See https://learn.microsoft.com/en-us/typography/opentype/spec/os2#cpr */
|
|
FT_ULong codepages = os2_table->ulCodePageRange1;
|
|
if (codepages & (1 << 19) || codepages & (1 << 21)) {
|
|
return U"\ud55c\uad6d\uc5b4"; /* 한국어 Korean. */
|
|
}
|
|
if (codepages & (1 << 20)) {
|
|
return U"\u7E41\u9AD4\u5B57"; /* 繁體字 Traditional Chinese. */
|
|
}
|
|
if (codepages & (1 << 17) && !(codepages & (1 << 18))) {
|
|
return U"\u65E5\u672C\u8A9E"; /* 日本語 Japanese. */
|
|
}
|
|
if (codepages & (1 << 18) && !(codepages & (1 << 17))) {
|
|
return U"\u7B80\u4F53\u5B57"; /* 简体字 Simplified Chinese. */
|
|
}
|
|
|
|
for (uint i = 0; i < ARRAY_SIZE(unicode_samples); ++i) {
|
|
const UnicodeSample *s = &unicode_samples[i];
|
|
if (os2_table && s->field && s->mask) {
|
|
/* OS/2 Table contains 4 contiguous integers of script coverage bit flags. */
|
|
const FT_ULong *unicode_range = &os2_table->ulUnicodeRange1;
|
|
const int index = (s->field - 1);
|
|
BLI_assert(index < 4);
|
|
if (!(unicode_range[index] & s->mask)) {
|
|
continue;
|
|
}
|
|
}
|
|
if (FT_Get_Char_Index(face, s->sample[0]) != 0) {
|
|
sample = s->sample;
|
|
break;
|
|
}
|
|
}
|
|
|
|
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));
|
|
|
|
if (has_latin && ((has_cjk && language_count > 40) || (!has_cjk && language_count > 5))) {
|
|
return def;
|
|
}
|
|
|
|
return sample;
|
|
}
|
|
|
|
bool BLF_thumb_preview(const char *filename, uchar *buf, int w, int h, int /*channels*/)
|
|
{
|
|
/* Use own FT_Library and direct FreeType calls as this is called from multiple threads. */
|
|
FT_Library ft_lib = nullptr;
|
|
if (FT_Init_FreeType(&ft_lib) != FT_Err_Ok) {
|
|
return false;
|
|
}
|
|
|
|
FT_Face face;
|
|
if (FT_New_Face(ft_lib, filename, 0, &face) != FT_Err_Ok) {
|
|
FT_Done_FreeType(ft_lib);
|
|
return false;
|
|
}
|
|
|
|
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));
|
|
|
|
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. */
|
|
|
|
FT_Pos advance_x = 0;
|
|
int glyph_count = 0; /* How many are successfully loaded and rendered. */
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
FT_Done_Face(face);
|
|
FT_Done_FreeType(ft_lib);
|
|
|
|
/* Return success if we printed at least one glyph. */
|
|
return glyph_count > 0;
|
|
}
|