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|
/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2009 Blender Foundation. All rights reserved. */
/** \file
* \ingroup blf
*
* Glyph rendering, texturing and caching. Wraps Freetype and OpenGL functions.
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H
#include FT_OUTLINE_H
#include FT_BITMAP_H
#include FT_ADVANCES_H /* For FT_Get_Advance. */
#include FT_MULTIPLE_MASTERS_H /* Variable font support. */
#include "MEM_guardedalloc.h"
#include "DNA_userdef_types.h"
#include "DNA_vec_types.h"
#include "BLI_listbase.h"
#include "BLI_rect.h"
#include "BLI_threads.h"
#include "BLF_api.h"
#include "GPU_capabilities.h"
#include "GPU_immediate.h"
#include "blf_internal.h"
#include "blf_internal_types.h"
#include "BLI_math_vector.h"
#include "BLI_strict_flags.h"
#include "BLI_string_utf8.h"
/* -------------------------------------------------------------------- */
/** \name Internal Utilities
* \{ */
/**
* Convert a floating point value to a FreeType 16.16 fixed point value.
*/
static FT_Fixed to_16dot16(double val)
{
return (FT_Fixed)(lround(val * 65536.0));
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Glyph Cache
* \{ */
static GlyphCacheBLF *blf_glyph_cache_find(FontBLF *font, float size, unsigned int dpi)
{
GlyphCacheBLF *gc = (GlyphCacheBLF *)font->cache.first;
while (gc) {
if (gc->size == size && gc->dpi == dpi && (gc->bold == ((font->flags & BLF_BOLD) != 0)) &&
(gc->italic == ((font->flags & BLF_ITALIC) != 0)) &&
(gc->char_weight == font->char_weight) && (gc->char_slant == font->char_slant) &&
(gc->char_width == font->char_width) && (gc->char_spacing == font->char_spacing)) {
return gc;
}
gc = gc->next;
}
return NULL;
}
static GlyphCacheBLF *blf_glyph_cache_new(FontBLF *font)
{
GlyphCacheBLF *gc = (GlyphCacheBLF *)MEM_callocN(sizeof(GlyphCacheBLF), "blf_glyph_cache_new");
gc->next = NULL;
gc->prev = NULL;
gc->size = font->size;
gc->dpi = font->dpi;
gc->bold = ((font->flags & BLF_BOLD) != 0);
gc->italic = ((font->flags & BLF_ITALIC) != 0);
gc->char_weight = font->char_weight;
gc->char_slant = font->char_slant;
gc->char_width = font->char_width;
gc->char_spacing = font->char_spacing;
memset(gc->glyph_ascii_table, 0, sizeof(gc->glyph_ascii_table));
memset(gc->bucket, 0, sizeof(gc->bucket));
/* Determine ideal fixed-width size for monospaced output. */
FT_UInt gindex = FT_Get_Char_Index(font->face, U'0');
if (gindex) {
FT_Fixed advance = 0;
FT_Get_Advance(font->face, gindex, FT_LOAD_NO_HINTING, &advance);
/* Use CSS 'ch unit' width, advance of zero character. */
gc->fixed_width = (int)(advance >> 16);
}
else {
/* Font does not contain "0" so use CSS fallback of 1/2 of em. */
gc->fixed_width = (int)((font->face->size->metrics.height / 2) >> 6);
}
if (gc->fixed_width < 1) {
gc->fixed_width = 1;
}
BLI_addhead(&font->cache, gc);
return gc;
}
GlyphCacheBLF *blf_glyph_cache_acquire(FontBLF *font)
{
BLI_spin_lock(font->glyph_cache_mutex);
GlyphCacheBLF *gc = blf_glyph_cache_find(font, font->size, font->dpi);
if (!gc) {
gc = blf_glyph_cache_new(font);
}
return gc;
}
void blf_glyph_cache_release(FontBLF *font)
{
BLI_spin_unlock(font->glyph_cache_mutex);
}
static void blf_glyph_cache_free(GlyphCacheBLF *gc)
{
GlyphBLF *g;
for (uint i = 0; i < ARRAY_SIZE(gc->bucket); i++) {
while ((g = BLI_pophead(&gc->bucket[i]))) {
blf_glyph_free(g);
}
}
if (gc->texture) {
GPU_texture_free(gc->texture);
}
if (gc->bitmap_result) {
MEM_freeN(gc->bitmap_result);
}
MEM_freeN(gc);
}
void blf_glyph_cache_clear(FontBLF *font)
{
GlyphCacheBLF *gc;
BLI_spin_lock(font->glyph_cache_mutex);
while ((gc = BLI_pophead(&font->cache))) {
blf_glyph_cache_free(gc);
}
BLI_spin_unlock(font->glyph_cache_mutex);
}
/**
* Try to find a glyph in cache.
*
* \return NULL if not found.
*/
static GlyphBLF *blf_glyph_cache_find_glyph(GlyphCacheBLF *gc, uint charcode)
{
if (charcode < GLYPH_ASCII_TABLE_SIZE) {
return gc->glyph_ascii_table[charcode];
}
GlyphBLF *g = gc->bucket[blf_hash(charcode)].first;
while (g) {
if (g->c == charcode) {
return g;
}
g = g->next;
}
return NULL;
}
/**
* Add a rendered glyph to a cache.
*/
static GlyphBLF *blf_glyph_cache_add_glyph(
FontBLF *font, GlyphCacheBLF *gc, FT_GlyphSlot glyph, uint charcode, FT_UInt glyph_index)
{
GlyphBLF *g = (GlyphBLF *)MEM_callocN(sizeof(GlyphBLF), "blf_glyph_get");
g->c = charcode;
g->idx = glyph_index;
g->advance_x = (ft_pix)glyph->advance.x;
g->pos[0] = glyph->bitmap_left;
g->pos[1] = glyph->bitmap_top;
g->dims[0] = (int)glyph->bitmap.width;
g->dims[1] = (int)glyph->bitmap.rows;
g->pitch = glyph->bitmap.pitch;
FT_BBox bbox;
FT_Outline_Get_CBox(&(glyph->outline), &bbox);
g->box_xmin = (ft_pix)bbox.xMin;
g->box_xmax = (ft_pix)bbox.xMax;
g->box_ymin = (ft_pix)bbox.yMin;
g->box_ymax = (ft_pix)bbox.yMax;
/* Used to improve advance when hinting is enabled. */
g->lsb_delta = (ft_pix)glyph->lsb_delta;
g->rsb_delta = (ft_pix)glyph->rsb_delta;
const int buffer_size = (int)(glyph->bitmap.width * glyph->bitmap.rows);
if (buffer_size != 0) {
if (font->flags & BLF_MONOCHROME) {
/* Font buffer uses only 0 or 1 values, Blender expects full 0..255 range. */
for (int i = 0; i < buffer_size; i++) {
glyph->bitmap.buffer[i] = glyph->bitmap.buffer[i] ? 255 : 0;
}
}
g->bitmap = MEM_mallocN((size_t)buffer_size, "glyph bitmap");
memcpy(g->bitmap, glyph->bitmap.buffer, (size_t)buffer_size);
}
unsigned int key = blf_hash(g->c);
BLI_addhead(&(gc->bucket[key]), g);
if (charcode < GLYPH_ASCII_TABLE_SIZE) {
gc->glyph_ascii_table[charcode] = g;
}
return g;
}
/* This table can be used to find a coverage bit based on a charcode. later we can get default
* language and script from codepoint. */
typedef struct eUnicodeBlock {
unsigned int first;
unsigned int last;
int coverage_bit; /* 0-122. -1 is N/A. */
/* Later we add primary script and language for Harfbuzz, data from
* https://en.wikipedia.org/wiki/Unicode_block */
} eUnicodeBlock;
static eUnicodeBlock unicode_blocks[] = {
/* Must be in ascending order by start of range. */
{0x0, 0x7F, 0}, /* Basic Latin. */
{0x80, 0xFF, 1}, /* Latin-1 Supplement. */
{0x100, 0x17F, 2}, /* Latin Extended-A. */
{0x180, 0x24F, 3}, /* Latin Extended-B. */
{0x250, 0x2AF, 4}, /* IPA Extensions. */
{0x2B0, 0x2FF, 5}, /* Spacing Modifier Letters. */
{0x300, 0x36F, 6}, /* Combining Diacritical Marks. */
{0x370, 0x3FF, 7}, /* Greek. */
{0x400, 0x52F, 9}, /* Cyrillic. */
{0x530, 0x58F, 10}, /* Armenian. */
{0x590, 0x5FF, 11}, /* Hebrew. */
{0x600, 0x6FF, 13}, /* Arabic. */
{0x700, 0x74F, 71}, /* Syriac. */
{0x750, 0x77F, 13}, /* Arabic Supplement. */
{0x780, 0x7BF, 72}, /* Thaana. */
{0x7C0, 0x7FF, 14}, /* NKo. */
{0x800, 0x83F, -1}, /* Samaritan. */
{0x840, 0x85F, -1}, /* Mandaic. */
{0x900, 0x97F, 15}, /* Devanagari. */
{0x980, 0x9FF, 16}, /* Bengali. */
{0xA00, 0xA7F, 17}, /* Gurmukhi. */
{0xA80, 0xAFF, 18}, /* Gujarati. */
{0xB00, 0xB7F, 19}, /* Oriya. */
{0xB80, 0xBFF, 20}, /* Tamil. */
{0xC00, 0xC7F, 21}, /* Telugu. */
{0xC80, 0xCFF, 22}, /* Kannada. */
{0xD00, 0xD7F, 23}, /* Malayalam. */
{0xD80, 0xDFF, 73}, /* Sinhala. */
{0xE00, 0xE7F, 24}, /* Thai. */
{0xE80, 0xEFF, 25}, /* Lao. */
{0xF00, 0xFFF, 70}, /* Tibetan. */
{0x1000, 0x109F, 74}, /* Myanmar. */
{0x10A0, 0x10FF, 26}, /* Georgian. */
{0x1100, 0x11FF, 28}, /* Hangul Jamo. */
{0x1200, 0x139F, 75}, /* Ethiopic. */
{0x13A0, 0x13FF, 76}, /* Cherokee. */
{0x1400, 0x167F, 77}, /* Canadian Aboriginal. */
{0x1680, 0x169F, 78}, /* Ogham. */
{0x16A0, 0x16FF, 79}, /* unic. */
{0x1700, 0x171F, 84}, /* Tagalog. */
{0x1720, 0x173F, 84}, /* Hanunoo. */
{0x1740, 0x175F, 84}, /* Buhid. */
{0x1760, 0x177F, 84}, /* Tagbanwa. */
{0x1780, 0x17FF, 80}, /* Khmer. */
{0x1800, 0x18AF, 81}, /* Mongolian. */
{0x1900, 0x194F, 93}, /* Limbu. */
{0x1950, 0x197F, 94}, /* Tai Le. */
{0x1980, 0x19DF, 95}, /* New Tai Lue". */
{0x19E0, 0x19FF, 80}, /* Khmer. */
{0x1A00, 0x1A1F, 96}, /* Buginese. */
{0x1A20, 0x1AAF, -1}, /* Tai Tham. */
{0x1B00, 0x1B7F, 27}, /* Balinese. */
{0x1B80, 0x1BBF, 112}, /* Sundanese. */
{0x1BC0, 0x1BFF, -1}, /* Batak. */
{0x1C00, 0x1C4F, 113}, /* Lepcha. */
{0x1C50, 0x1C7F, 114}, /* Ol Chiki. */
{0x1D00, 0x1DBF, 4}, /* IPA Extensions. */
{0x1DC0, 0x1DFF, 6}, /* Combining Diacritical Marks. */
{0x1E00, 0x1EFF, 29}, /* Latin Extended Additional. */
{0x1F00, 0x1FFF, 30}, /* Greek Extended. */
{0x2000, 0x206F, 31}, /* General Punctuation. */
{0x2070, 0x209F, 32}, /* Superscripts And Subscripts. */
{0x20A0, 0x20CF, 33}, /* Currency Symbols. */
{0x20D0, 0x20FF, 34}, /* Combining Diacritical Marks For Symbols. */
{0x2100, 0x214F, 35}, /* Letterlike Symbols. */
{0x2150, 0x218F, 36}, /* Number Forms. */
{0x2190, 0x21FF, 37}, /* Arrows. */
{0x2200, 0x22FF, 38}, /* Mathematical Operators. */
{0x2300, 0x23FF, 39}, /* Miscellaneous Technical. */
{0x2400, 0x243F, 40}, /* Control Pictures. */
{0x2440, 0x245F, 41}, /* Optical Character Recognition. */
{0x2460, 0x24FF, 42}, /* Enclosed Alphanumerics. */
{0x2500, 0x257F, 43}, /* Box Drawing. */
{0x2580, 0x259F, 44}, /* Block Elements. */
{0x25A0, 0x25FF, 45}, /* Geometric Shapes. */
{0x2600, 0x26FF, 46}, /* Miscellaneous Symbols. */
{0x2700, 0x27BF, 47}, /* Dingbats. */
{0x27C0, 0x27EF, 38}, /* Mathematical Operators. */
{0x27F0, 0x27FF, 37}, /* Arrows. */
{0x2800, 0x28FF, 82}, /* Braille. */
{0x2900, 0x297F, 37}, /* Arrows. */
{0x2980, 0x2AFF, 38}, /* Mathematical Operators. */
{0x2B00, 0x2BFF, 37}, /* Arrows. */
{0x2C00, 0x2C5F, 97}, /* Glagolitic. */
{0x2C60, 0x2C7F, 29}, /* Latin Extended Additional. */
{0x2C80, 0x2CFF, 8}, /* Coptic. */
{0x2D00, 0x2D2F, 26}, /* Georgian. */
{0x2D30, 0x2D7F, 98}, /* Tifinagh. */
{0x2D80, 0x2DDF, 75}, /* Ethiopic. */
{0x2DE0, 0x2DFF, 9}, /* Cyrillic. */
{0x2E00, 0x2E7F, 31}, /* General Punctuation. */
{0x2E80, 0x2FFF, 59}, /* CJK Unified Ideographs. */
{0x3000, 0x303F, 48}, /* CJK Symbols And Punctuation. */
{0x3040, 0x309F, 49}, /* Hiragana. */
{0x30A0, 0x30FF, 50}, /* Katakana. */
{0x3100, 0x312F, 51}, /* Bopomofo. */
{0x3130, 0x318F, 52}, /* Hangul Compatibility Jamo. */
{0x3190, 0x319F, 59}, /* CJK Unified Ideographs. */
{0x31A0, 0x31BF, 51}, /* Bopomofo. */
{0x31C0, 0x31EF, 59}, /* CJK Unified Ideographs. */
{0x31F0, 0x31FF, 50}, /* Katakana. */
{0x3200, 0x32FF, 54}, /* Enclosed CJK Letters And Months. */
{0x3300, 0x33FF, 55}, /* CJK Compatibility. */
{0x3400, 0x4DBF, 59}, /* CJK Unified Ideographs. */
{0x4DC0, 0x4DFF, 99}, /* Yijing. */
{0x4E00, 0x9FFF, 59}, /* CJK Unified Ideographs. */
{0xA000, 0xA4CF, 83}, /* Yi. */
{0xA4D0, 0xA4FF, -1}, /* Lisu. */
{0xA500, 0xA63F, 12}, /* Vai. */
{0xA640, 0xA69F, 9}, /* Cyrillic. */
{0xA6A0, 0xA6FF, -1}, /* Bamum. */
{0xA700, 0xA71F, 5}, /* Spacing Modifier Letters. */
{0xA720, 0xA7FF, 29}, /* Latin Extended Additional. */
{0xA800, 0xA82F, 100}, /* Syloti Nagri. */
{0xA840, 0xA87F, 53}, /* Phags-pa. */
{0xA880, 0xA8DF, 115}, /* Saurashtra. */
{0xA900, 0xA92F, 116}, /* Kayah Li. */
{0xA930, 0xA95F, 117}, /* Rejang. */
{0xA960, 0xA97F, 56}, /* Hangul Syllables. */
{0xA980, 0xA9DF, -1}, /* Javanese. */
{0xA9E0, 0xA9FF, 74}, /* Myanmar. */
{0xAA00, 0xAA5F, 118}, /* Cham. */
{0xAA60, 0xAA7F, 74}, /* Myanmar. */
{0xAA80, 0xAADF, -1}, /* Tai Viet. */
{0xAAE0, 0xAAFF, -1}, /* Meetei Mayek. */
{0xAB00, 0xAB2F, 75}, /* Ethiopic. */
{0xAB70, 0xABBF, 76}, /* Cherokee. */
{0xABC0, 0xABFF, -1}, /* Meetei Mayek. */
{0xAC00, 0xD7AF, 56}, /* Hangul Syllables. */
{0xD800, 0xDFFF, 57}, /* Non-Plane 0. */
{0xE000, 0xF6FF, 60}, /* Private Use Area. */
{0xE700, 0xEFFF, -1}, /* MS Wingdings. */
{0xF000, 0xF8FF, -1}, /* MS Symbols. */
{0xF900, 0xFAFF, 61}, /* CJK Compatibility Ideographs. */
{0xFB00, 0xFB4F, 62}, /* Alphabetic Presentation Forms. */
{0xFB50, 0xFDFF, 63}, /* Arabic Presentation Forms-A. */
{0xFE00, 0xFE0F, 91}, /* Variation Selectors. */
{0xFE10, 0xFE1F, 65}, /* CJK Compatibility Forms. */
{0xFE20, 0xFE2F, 64}, /* Combining Half Marks. */
{0xFE30, 0xFE4F, 65}, /* CJK Compatibility Forms. */
{0xFE50, 0xFE6F, 66}, /* Small Form Variants. */
{0xFE70, 0xFEFF, 67}, /* Arabic Presentation Forms-B. */
{0xFF00, 0xFFEF, 68}, /* Half-width And Full-width Forms. */
{0xFFF0, 0xFFFF, 69}, /* Specials. */
{0x10000, 0x1013F, 101}, /* Linear B. */
{0x10140, 0x1018F, 102}, /* Ancient Greek Numbers. */
{0x10190, 0x101CF, 119}, /* Ancient Symbols. */
{0x101D0, 0x101FF, 120}, /* Phaistos Disc. */
{0x10280, 0x1029F, 121}, /* Lycian. */
{0x102A0, 0x102DF, 121}, /* Carian. */
{0x10300, 0x1032F, 85}, /* Old Italic. */
{0x10330, 0x1034F, 86}, /* Gothic. */
{0x10350, 0x1037F, -1}, /* Old Permic. */
{0x10380, 0x1039F, 103}, /* Ugaritic. */
{0x103A0, 0x103DF, 104}, /* Old Persian. */
{0x10400, 0x1044F, 87}, /* Deseret. */
{0x10450, 0x1047F, 105}, /* Shavian. */
{0x10480, 0x104AF, 106}, /* Osmanya. */
{0x104B0, 0x104FF, -1}, /* Osage. */
{0x10500, 0x1052F, -1}, /* Elbasan. */
{0x10530, 0x1056F, -1}, /* Caucasian Albanian. */
{0x10570, 0x105BF, -1}, /* Vithkuqi. */
{0x10600, 0x1077F, -1}, /* Linear A. */
{0x10780, 0x107BF, 3}, /* Latin Extended-B. */
{0x10800, 0x1083F, 107}, /* Cypriot Syllabary. */
{0x10840, 0x1085F, -1}, /* Imperial Aramaic. */
{0x10860, 0x1087F, -1}, /* Palmyrene. */
{0x10880, 0x108AF, -1}, /* Nabataean. */
{0x108E0, 0x108FF, -1}, /* Hatran. */
{0x10900, 0x1091F, 58}, /* Phoenician. */
{0x10920, 0x1093F, 121}, /* Lydian. */
{0x10980, 0x1099F, -1}, /* Meroitic Hieroglyphs. */
{0x109A0, 0x109FF, -1}, /* Meroitic Cursive. */
{0x10A00, 0x10A5F, 108}, /* Kharoshthi. */
{0x10A60, 0x10A7F, -1}, /* Old South Arabian. */
{0x10A80, 0x10A9F, -1}, /* Old North Arabian. */
{0x10AC0, 0x10AFF, -1}, /* Manichaean. */
{0x10B00, 0x10B3F, -1}, /* Avestan. */
{0x10B40, 0x10B5F, -1}, /* Inscriptional Parthian. */
{0x10B60, 0x10B7F, -1}, /* Inscriptional Pahlavi. */
{0x10B80, 0x10BAF, -1}, /* Psalter Pahlavi. */
{0x10C00, 0x10C4F, -1}, /* Old Turkic. */
{0x10C80, 0x10CFF, -1}, /* Old Hungarian. */
{0x10D00, 0x10D3F, -1}, /* Hanifi Rohingya. */
{0x108E0, 0x10E7F, -1}, /* Rumi Numeral Symbols. */
{0x10E80, 0x10EBF, -1}, /* Yezidi. */
{0x10F00, 0x10F2F, -1}, /* Old Sogdian. */
{0x10F30, 0x10F6F, -1}, /* Sogdian. */
{0x10F70, 0x10FAF, -1}, /* Old Uyghur. */
{0x10FB0, 0x10FDF, -1}, /* Chorasmian. */
{0x10FE0, 0x10FFF, -1}, /* Elymaic. */
{0x11000, 0x1107F, -1}, /* Brahmi. */
{0x11080, 0x110CF, -1}, /* Kaithi. */
{0x110D0, 0x110FF, -1}, /* Sora Sompeng. */
{0x11100, 0x1114F, -1}, /* Chakma. */
{0x11150, 0x1117F, -1}, /* Mahajani. */
{0x11180, 0x111DF, -1}, /* Sharada. */
{0x111E0, 0x111FF, -1}, /* Sinhala Archaic Numbers. */
{0x11200, 0x1124F, -1}, /* Khojki. */
{0x11280, 0x112AF, -1}, /* Multani. */
{0x112B0, 0x112FF, -1}, /* Khudawadi. */
{0x11300, 0x1137F, -1}, /* Grantha. */
{0x11400, 0x1147F, -1}, /* Newa. */
{0x11480, 0x114DF, -1}, /* Tirhuta. */
{0x11580, 0x115FF, -1}, /* Siddham. */
{0x11600, 0x1165F, -1}, /* Modi. */
{0x11660, 0x1167F, 81}, /* Mongolian. */
{0x11680, 0x116CF, -1}, /* Takri. */
{0x11700, 0x1174F, -1}, /* Ahom. */
{0x11800, 0x1184F, -1}, /* Dogra. */
{0x118A0, 0x118FF, -1}, /* Warang Citi. */
{0x11900, 0x1195F, -1}, /* Dives Akuru. */
{0x119A0, 0x119FF, -1}, /* Nandinagari. */
{0x11A00, 0x11A4F, -1}, /* Zanabazar Square. */
{0x11A50, 0x11AAF, -1}, /* Soyombo. */
{0x11AB0, 0x11ABF, 77}, /* Canadian Aboriginal Syllabics. */
{0x11AC0, 0x11AFF, -1}, /* Pau Cin Hau. */
{0x11C00, 0x11C6F, -1}, /* Bhaiksuki. */
{0x11C70, 0x11CBF, -1}, /* Marchen. */
{0x11D00, 0x11D5F, -1}, /* Masaram Gondi. */
{0x11D60, 0x11DAF, -1}, /* Gunjala Gondi. */
{0x11EE0, 0x11EFF, -1}, /* Makasar. */
{0x11FB0, 0x11FBF, -1}, /* Lisu. */
{0x11FC0, 0x11FFF, 20}, /* Tamil. */
{0x12000, 0x1254F, 110}, /* Cuneiform. */
{0x12F90, 0x12FFF, -1}, /* Cypro-Minoan. */
{0x13000, 0x1343F, -1}, /* Egyptian Hieroglyphs. */
{0x14400, 0x1467F, -1}, /* Anatolian Hieroglyphs. */
{0x16800, 0x16A3F, -1}, /* Bamum. */
{0x16A40, 0x16A6F, -1}, /* Mro. */
{0x16A70, 0x16ACF, -1}, /* Tangsa. */
{0x16AD0, 0x16AFF, -1}, /* Bassa Vah. */
{0x16B00, 0x16B8F, -1}, /* Pahawh Hmong. */
{0x16E40, 0x16E9F, -1}, /* Medefaidrin. */
{0x16F00, 0x16F9F, -1}, /* Miao. */
{0x16FE0, 0x16FFF, -1}, /* Ideographic Symbols. */
{0x17000, 0x18AFF, -1}, /* Tangut. */
{0x1B170, 0x1B2FF, -1}, /* Nushu. */
{0x1BC00, 0x1BC9F, -1}, /* Duployan. */
{0x1D000, 0x1D24F, 88}, /* Musical Symbols. */
{0x1D2E0, 0x1D2FF, -1}, /* Mayan Numerals. */
{0x1D300, 0x1D35F, 109}, /* Tai Xuan Jing. */
{0x1D360, 0x1D37F, 111}, /* Counting Rod Numerals. */
{0x1D400, 0x1D7FF, 89}, /* Mathematical Alphanumeric Symbols. */
{0x1E2C0, 0x1E2FF, -1}, /* Wancho. */
{0x1E800, 0x1E8DF, -1}, /* Mende Kikakui. */
{0x1E900, 0x1E95F, -1}, /* Adlam. */
{0x1EC70, 0x1ECBF, -1}, /* Indic Siyaq Numbers. */
{0x1F000, 0x1F02F, 122}, /* Mahjong Tiles. */
{0x1F030, 0x1F09F, 122}, /* Domino Tiles. */
{0x1F600, 0x1F64F, -1}, /* Emoticons. */
{0x20000, 0x2A6DF, 59}, /* CJK Unified Ideographs. */
{0x2F800, 0x2FA1F, 61}, /* CJK Compatibility Ideographs. */
{0xE0000, 0xE007F, 92}, /* Tags. */
{0xE0100, 0xE01EF, 91}, /* Variation Selectors. */
{0xF0000, 0x10FFFD, 90}}; /* Private Use Supplementary. */
/* Find a unicode block that a charcode belongs to. */
static eUnicodeBlock *blf_charcode_to_unicode_block(uint charcode)
{
if (charcode < 0x80) {
/* Shortcut to Basic Latin. */
return &unicode_blocks[0];
}
/* Binary search for other blocks. */
int min = 0;
int max = ARRAY_SIZE(unicode_blocks) - 1;
int mid;
if (charcode < unicode_blocks[0].first || charcode > unicode_blocks[max].last) {
return NULL;
}
while (max >= min) {
mid = (min + max) / 2;
if (charcode > unicode_blocks[mid].last) {
min = mid + 1;
}
else if (charcode < unicode_blocks[mid].first) {
max = mid - 1;
}
else {
return &unicode_blocks[mid];
}
}
return NULL;
}
static int blf_charcode_to_coverage_bit(uint charcode)
{
int coverage_bit = -1;
eUnicodeBlock *block = blf_charcode_to_unicode_block(charcode);
if (block) {
coverage_bit = block->coverage_bit;
}
if (coverage_bit < 0 && charcode > 0xFFFF) {
/* No coverage bit, but OpenType specs v.1.3+ says bit 57 implies that there
* are codepoints supported beyond the BMP, so only check fonts with this set. */
coverage_bit = 57;
}
return coverage_bit;
}
static bool blf_font_has_coverage_bit(FontBLF *font, int coverage_bit)
{
if (coverage_bit < 0) {
return false;
}
return (font->UnicodeRanges[(uint)coverage_bit >> 5] & (1u << ((uint)coverage_bit % 32)));
}
/**
* Return a glyph index from `charcode`. Not found returns zero, which is a valid
* printable character (`.notdef` or `tofu`). Font is allowed to change here.
*/
static FT_UInt blf_glyph_index_from_charcode(FontBLF **font, const uint charcode)
{
FT_UInt glyph_index = FT_Get_Char_Index((*font)->face, charcode);
if (glyph_index) {
return glyph_index;
}
/* Not found in main font, so look in the others. */
FontBLF *last_resort = NULL;
int coverage_bit = blf_charcode_to_coverage_bit(charcode);
for (int i = 0; i < BLF_MAX_FONT; i++) {
FontBLF *f = global_font[i];
if (!f || f == *font || !(f->flags & BLF_DEFAULT)) {
continue;
}
if (f->flags & BLF_LAST_RESORT) {
last_resort = f;
continue;
}
if (coverage_bit < 0 || blf_font_has_coverage_bit(f, coverage_bit)) {
glyph_index = FT_Get_Char_Index(f->face, charcode);
if (glyph_index) {
*font = f;
return glyph_index;
}
}
}
/* Not found in the stack, return from Last Resort if there is one. */
if (last_resort) {
glyph_index = FT_Get_Char_Index(last_resort->face, charcode);
if (glyph_index) {
*font = last_resort;
return glyph_index;
}
}
return 0;
}
/**
* Load a glyph into the glyph slot of a font's face object.
*/
static FT_GlyphSlot blf_glyph_load(FontBLF *font, FT_UInt glyph_index)
{
int load_flags;
if (font->flags & BLF_MONOCHROME) {
load_flags = FT_LOAD_TARGET_MONO;
}
else {
load_flags = FT_LOAD_NO_BITMAP;
if (font->flags & BLF_HINTING_NONE) {
load_flags |= FT_LOAD_TARGET_NORMAL | FT_LOAD_NO_HINTING;
}
else if (font->flags & BLF_HINTING_SLIGHT) {
load_flags |= FT_LOAD_TARGET_LIGHT;
}
else if (font->flags & BLF_HINTING_FULL) {
load_flags |= FT_LOAD_TARGET_NORMAL;
}
else {
/* Default, hinting disabled until FreeType has been upgraded
* to give good results on all platforms. */
load_flags |= FT_LOAD_TARGET_NORMAL | FT_LOAD_NO_HINTING;
}
}
if (FT_Load_Glyph(font->face, glyph_index, load_flags) == FT_Err_Ok) {
return font->face->glyph;
}
return NULL;
}
/**
* Convert a glyph from outlines to a bitmap that we can display.
*/
static bool blf_glyph_render_bitmap(FontBLF *font, FT_GlyphSlot glyph)
{
int render_mode;
if (font->flags & BLF_MONOCHROME) {
render_mode = FT_RENDER_MODE_MONO;
}
else {
render_mode = FT_RENDER_MODE_NORMAL;
}
/* Render the glyph curves to a bitmap. */
FT_Error err = FT_Render_Glyph(glyph, render_mode);
if (err != FT_Err_Ok) {
return false;
}
FT_Bitmap tempbitmap;
if (font->flags & BLF_MONOCHROME) {
/* Convert result from 1 bit per pixel to 8 bit per pixel */
/* Accumulate errors for later, fine if not interested beyond "ok vs any error" */
FT_Bitmap_New(&tempbitmap);
/* Does Blender use Pitch 1 always? It works so far */
err += FT_Bitmap_Convert(font->ft_lib, &glyph->bitmap, &tempbitmap, 1);
err += FT_Bitmap_Copy(font->ft_lib, &tempbitmap, &glyph->bitmap);
err += FT_Bitmap_Done(font->ft_lib, &tempbitmap);
}
if (err || glyph->format != FT_GLYPH_FORMAT_BITMAP) {
return false;
}
return true;
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Variations (Multiple Masters) support
* \{ */
/**
* Return a design axis that matches an identifying tag.
*
* \param variations: Variation descriptors from `FT_Get_MM_Var`.
* \param tag: Axis tag (4-character string as uint), like 'wght'
* \param axis_index: returns index of axis in variations array.
*/
static FT_Var_Axis *blf_var_axis_by_tag(FT_MM_Var *variations, uint tag, int *axis_index)
{
*axis_index = -1;
if (!variations) {
return NULL;
}
for (int i = 0; i < (int)variations->num_axis; i++) {
if (variations->axis[i].tag == tag) {
*axis_index = i;
return &(variations->axis)[i];
break;
}
}
return NULL;
}
/**
* Convert a float factor to a fixed-point design coordinate.
*
* \param axis: Pointer to a design space axis structure.
* \param factor: -1 to 1 with 0 meaning "default"
*/
static FT_Fixed blf_factor_to_coordinate(FT_Var_Axis *axis, float factor)
{
FT_Fixed value = axis->def;
if (factor > 0) {
/* Map 0-1 to axis->def - axis->maximum */
value += (FT_Fixed)((double)(axis->maximum - axis->def) * factor);
}
else if (factor < 0) {
/* Map -1-0 to axis->minimum - axis->def */
value += (FT_Fixed)((double)(axis->def - axis->minimum) * factor);
}
return value;
}
/**
* Alter a face variation axis by a factor
*
* \param coords: array of design coordinates, per axis.
* \param tag: Axis tag (4-character string as uint), like 'wght'
* \param factor: -1 to 1 with 0 meaning "default"
*/
static bool blf_glyph_set_variation_normalized(FontBLF *font,
FT_Fixed coords[],
uint tag,
float factor)
{
int axis_index;
FT_Var_Axis *axis = blf_var_axis_by_tag(font->variations, tag, &axis_index);
if (axis && (axis_index < BLF_VARIATIONS_MAX)) {
coords[axis_index] = blf_factor_to_coordinate(axis, factor);
return true;
}
return false;
}
/**
* Set a face variation axis to an exact float value
*
* \param coords: array of design coordinates, per axis.
* \param tag: Axis tag (4-character string as uint), like 'opsz'
* \param value: New float value. Converted to 16.16 and clamped within allowed range.
*/
static bool blf_glyph_set_variation_float(FontBLF *font, FT_Fixed coords[], uint tag, float value)
{
int axis_index;
FT_Var_Axis *axis = blf_var_axis_by_tag(font->variations, tag, &axis_index);
if (axis && (axis_index < BLF_VARIATIONS_MAX)) {
FT_Fixed int_value = to_16dot16(value);
CLAMP(int_value, axis->minimum, axis->maximum);
coords[axis_index] = int_value;
return true;
}
return false;
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Glyph Transformations
* \{ */
/**
* Adjust the glyphs weight by a factor.
*
* \param factor: -1 (min stroke width) <= 0 (normal) => 1 (max boldness).
*/
static bool blf_glyph_transform_weight(FT_GlyphSlot glyph, float factor, bool monospaced)
{
if (glyph->format == FT_GLYPH_FORMAT_OUTLINE) {
/* Fake bold if the font does not have this variable axis. */
const FT_Pos average_width = FT_MulFix(glyph->face->units_per_EM,
glyph->face->size->metrics.x_scale);
FT_Pos change = (FT_Pos)((float)average_width * factor * 0.1f);
FT_Outline_EmboldenXY(&glyph->outline, change, change / 2);
if (monospaced) {
/* Widened fixed-pitch font needs a nudge left. */
FT_Outline_Translate(&glyph->outline, change / -2, 0);
}
else {
/* Need to increase advance. */
glyph->advance.x += change;
glyph->advance.y += change / 2;
}
return true;
}
return false;
}
/**
* Adjust the glyphs slant by a factor (making it oblique).
*
* \param factor: -1 (max negative) <= 0 (no slant) => 1 (max positive).
*
* \note that left-leaning italics are possible in some RTL writing systems.
*/
static bool blf_glyph_transform_slant(FT_GlyphSlot glyph, float factor)
{
if (glyph->format == FT_GLYPH_FORMAT_OUTLINE) {
FT_Matrix transform = {to_16dot16(1), to_16dot16(factor / 2.0f), 0, to_16dot16(1)};
FT_Outline_Transform(&glyph->outline, &transform);
return true;
}
return false;
}
/**
* Adjust the glyph width by factor.
*
* \param factor: -1 (min width) <= 0 (normal) => 1 (max width).
*/
static bool blf_glyph_transform_width(FT_GlyphSlot glyph, float factor)
{
if (glyph->format == FT_GLYPH_FORMAT_OUTLINE) {
float scale = (factor * 0.4f) + 1.0f; /* 0.6f - 1.4f */
FT_Matrix matrix = {to_16dot16(scale), 0, 0, to_16dot16(1)};
FT_Outline_Transform(&glyph->outline, &matrix);
glyph->advance.x = (FT_Pos)((double)glyph->advance.x * scale);
return true;
}
return false;
}
/**
* Change glyph advance to alter letter-spacing (tracking).
*
* \param factor: -1 (min tightness) <= 0 (normal) => 1 (max looseness).
*/
static bool blf_glyph_transform_spacing(FT_GlyphSlot glyph, float factor)
{
if (glyph->advance.x > 0) {
const int size = glyph->face->size->metrics.height;
glyph->advance.x += (FT_Pos)(factor * (float)size / 6.0f);
return true;
}
return false;
}
/**
* Transform glyph to fit nicely within a fixed column width.
*/
static bool blf_glyph_transform_monospace(FT_GlyphSlot glyph, int width)
{
if (glyph->format == FT_GLYPH_FORMAT_OUTLINE) {
FT_Fixed current = glyph->linearHoriAdvance;
FT_Fixed target = width << 16; /* Do math in 16.16 values. */
if (target < current) {
const FT_Pos embolden = (FT_Pos)((current - target) >> 13);
/* Horizontally widen strokes to counteract narrowing. */
FT_Outline_EmboldenXY(&glyph->outline, embolden, 0);
const float scale = (float)(target - (embolden << 9)) / (float)current;
FT_Matrix matrix = {to_16dot16(scale), 0, 0, to_16dot16(1)};
FT_Outline_Transform(&glyph->outline, &matrix);
}
else if (target > current) {
/* Center narrow glyphs. */
FT_Outline_Translate(&glyph->outline, (FT_Pos)((target - current) >> 11), 0);
}
glyph->advance.x = width << 6;
return true;
}
return false;
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Glyph Access (Ensure/Free)
* \{ */
/**
* Create and return a fully-rendered bitmap glyph.
*/
static FT_GlyphSlot blf_glyph_render(FontBLF *settings_font,
FontBLF *glyph_font,
FT_UInt glyph_index,
uint charcode,
int fixed_width)
{
if (glyph_font != settings_font) {
FT_Set_Char_Size(glyph_font->face,
0,
((FT_F26Dot6)(settings_font->size)) * 64,
settings_font->dpi,
settings_font->dpi);
glyph_font->size = settings_font->size;
glyph_font->dpi = settings_font->dpi;
}
/* We need to keep track if changes are still needed. */
bool weight_done = false;
bool slant_done = false;
bool width_done = false;
bool spacing_done = false;
/* 70% of maximum weight results in the same amount of boldness and horizontal
* expansion as the bold version (DejaVuSans-Bold.ttf) of our default font.
* Worth reevaluating if we change default font. */
float weight = (settings_font->flags & BLF_BOLD) ? 0.7f : settings_font->char_weight;
/* 37.5% of maximum rightward slant results in 6 degree slope, matching italic
* version (DejaVuSans-Oblique.ttf) of our current font. But a nice median when
* checking others. Worth reevaluating if we change default font. We could also
* narrow the glyph slightly as most italics do, but this one does not. */
float slant = (settings_font->flags & BLF_ITALIC) ? 0.375f : settings_font->char_slant;
float width = settings_font->char_width;
float spacing = settings_font->char_spacing;
/* Font variations need to be set before glyph loading. Even if new value is zero. */
if (glyph_font->variations) {
FT_Fixed coords[BLF_VARIATIONS_MAX];
/* Load current design coordinates. */
FT_Get_Var_Design_Coordinates(glyph_font->face, BLF_VARIATIONS_MAX, &coords[0]);
/* Update design coordinates with new values. */
weight_done = blf_glyph_set_variation_normalized(
glyph_font, coords, blf_variation_axis_weight, weight);
slant_done = blf_glyph_set_variation_normalized(
glyph_font, coords, blf_variation_axis_slant, slant);
width_done = blf_glyph_set_variation_normalized(
glyph_font, coords, blf_variation_axis_width, width);
spacing_done = blf_glyph_set_variation_normalized(
glyph_font, coords, blf_variation_axis_spacing, spacing);
/* Optical size, if available, is set to current font size. */
blf_glyph_set_variation_float(
glyph_font, coords, blf_variation_axis_optsize, settings_font->size);
/* Save updated design coordinates. */
FT_Set_Var_Design_Coordinates(glyph_font->face, BLF_VARIATIONS_MAX, &coords[0]);
}
FT_GlyphSlot glyph = blf_glyph_load(glyph_font, glyph_index);
if (!glyph) {
return NULL;
}
if ((settings_font->flags & BLF_MONOSPACED) && (settings_font != glyph_font)) {
blf_glyph_transform_monospace(glyph, BLI_wcwidth((char32_t)charcode) * fixed_width);
}
/* Fallback glyph transforms, but only if required and not yet done. */
if (weight != 0.0f && !weight_done) {
blf_glyph_transform_weight(glyph, weight, glyph->face->face_flags & FT_FACE_FLAG_FIXED_WIDTH);
}
if (slant != 0.0f && !slant_done) {
blf_glyph_transform_slant(glyph, slant);
}
if (width != 0.0f && !width_done) {
blf_glyph_transform_width(glyph, width);
}
if (spacing != 0.0f && !spacing_done) {
blf_glyph_transform_spacing(glyph, spacing);
}
if (blf_glyph_render_bitmap(glyph_font, glyph)) {
return glyph;
}
return NULL;
}
GlyphBLF *blf_glyph_ensure(FontBLF *font, GlyphCacheBLF *gc, uint charcode)
{
GlyphBLF *g = blf_glyph_cache_find_glyph(gc, charcode);
if (g) {
return g;
}
/* Glyph might not come from the initial font. */
FontBLF *font_with_glyph = font;
FT_UInt glyph_index = blf_glyph_index_from_charcode(&font_with_glyph, charcode);
/* Glyphs are dynamically created as needed by font rendering. this means that
* to make font rendering thread safe we have to do locking here. note that this
* must be a lock for the whole library and not just per font, because the font
* renderer uses a shared buffer internally. */
BLI_spin_lock(font_with_glyph->ft_lib_mutex);
FT_GlyphSlot glyph = blf_glyph_render(
font, font_with_glyph, glyph_index, charcode, gc->fixed_width);
if (glyph) {
/* Save this glyph in the initial font's cache. */
g = blf_glyph_cache_add_glyph(font, gc, glyph, charcode, glyph_index);
}
BLI_spin_unlock(font_with_glyph->ft_lib_mutex);
return g;
}
void blf_glyph_free(GlyphBLF *g)
{
if (g->bitmap) {
MEM_freeN(g->bitmap);
}
MEM_freeN(g);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Glyph Bounds Calculation
* \{ */
static void blf_glyph_calc_rect(rcti *rect, GlyphBLF *g, const int x, const int y)
{
rect->xmin = x + g->pos[0];
rect->xmax = rect->xmin + g->dims[0];
rect->ymin = y + g->pos[1];
rect->ymax = rect->ymin - g->dims[1];
}
static void blf_glyph_calc_rect_test(rcti *rect, GlyphBLF *g, const int x, const int y)
{
/* Intentionally check with `g->advance`, because this is the
* width used by BLF_width. This allows that the text slightly
* overlaps the clipping border to achieve better alignment. */
rect->xmin = x;
rect->xmax = rect->xmin + MIN2(ft_pix_to_int(g->advance_x), g->dims[0]);
rect->ymin = y;
rect->ymax = rect->ymin - g->dims[1];
}
static void blf_glyph_calc_rect_shadow(
rcti *rect, GlyphBLF *g, const int x, const int y, FontBLF *font)
{
blf_glyph_calc_rect(rect, g, x + font->shadow_x, y + font->shadow_y);
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name Glyph Drawing
* \{ */
static void blf_texture_draw(const unsigned char color[4],
const int glyph_size[2],
const int offset,
const int x1,
const int y1,
const int x2,
const int y2)
{
/* Only one vertex per glyph, geometry shader expand it into a quad. */
/* TODO: Get rid of Geom Shader because it's not optimal AT ALL for the GPU. */
copy_v4_fl4(GPU_vertbuf_raw_step(&g_batch.pos_step),
(float)(x1 + g_batch.ofs[0]),
(float)(y1 + g_batch.ofs[1]),
(float)(x2 + g_batch.ofs[0]),
(float)(y2 + g_batch.ofs[1]));
copy_v4_v4_uchar(GPU_vertbuf_raw_step(&g_batch.col_step), color);
copy_v2_v2_int(GPU_vertbuf_raw_step(&g_batch.glyph_size_step), glyph_size);
*((int *)GPU_vertbuf_raw_step(&g_batch.offset_step)) = offset;
g_batch.glyph_len++;
/* Flush cache if it's full. */
if (g_batch.glyph_len == BLF_BATCH_DRAW_LEN_MAX) {
blf_batch_draw();
}
}
static void blf_texture5_draw(const unsigned char color_in[4],
const int glyph_size[2],
const int offset,
const int x1,
const int y1,
const int x2,
const int y2)
{
int glyph_size_flag[2];
/* flag the x and y component signs for 5x5 blurring */
glyph_size_flag[0] = -glyph_size[0];
glyph_size_flag[1] = -glyph_size[1];
blf_texture_draw(color_in, glyph_size_flag, offset, x1, y1, x2, y2);
}
static void blf_texture3_draw(const unsigned char color_in[4],
const int glyph_size[2],
const int offset,
const int x1,
const int y1,
const int x2,
const int y2)
{
int glyph_size_flag[2];
/* flag the x component sign for 3x3 blurring */
glyph_size_flag[0] = -glyph_size[0];
glyph_size_flag[1] = glyph_size[1];
blf_texture_draw(color_in, glyph_size_flag, offset, x1, y1, x2, y2);
}
void blf_glyph_draw(FontBLF *font, GlyphCacheBLF *gc, GlyphBLF *g, const int x, const int y)
{
if ((!g->dims[0]) || (!g->dims[1])) {
return;
}
if (g->glyph_cache == NULL) {
if (font->tex_size_max == -1) {
font->tex_size_max = GPU_max_texture_size();
}
g->offset = gc->bitmap_len;
int buff_size = g->dims[0] * g->dims[1];
int bitmap_len = gc->bitmap_len + buff_size;
if (bitmap_len > gc->bitmap_len_alloc) {
int w = font->tex_size_max;
int h = bitmap_len / w + 1;
gc->bitmap_len_alloc = w * h;
gc->bitmap_result = MEM_reallocN(gc->bitmap_result, (size_t)gc->bitmap_len_alloc);
/* Keep in sync with the texture. */
if (gc->texture) {
GPU_texture_free(gc->texture);
}
gc->texture = GPU_texture_create_2d(__func__, w, h, 1, GPU_R8, NULL);
gc->bitmap_len_landed = 0;
}
memcpy(&gc->bitmap_result[gc->bitmap_len], g->bitmap, (size_t)buff_size);
gc->bitmap_len = bitmap_len;
g->glyph_cache = gc;
}
if (font->flags & BLF_CLIPPING) {
rcti rect_test;
blf_glyph_calc_rect_test(&rect_test, g, x, y);
BLI_rcti_translate(&rect_test, font->pos[0], font->pos[1]);
if (!BLI_rcti_inside_rcti(&font->clip_rec, &rect_test)) {
return;
}
}
if (g_batch.glyph_cache != g->glyph_cache) {
blf_batch_draw();
g_batch.glyph_cache = g->glyph_cache;
}
if (font->flags & BLF_SHADOW) {
rcti rect_ofs;
blf_glyph_calc_rect_shadow(&rect_ofs, g, x, y, font);
if (font->shadow == 0) {
blf_texture_draw(font->shadow_color,
g->dims,
g->offset,
rect_ofs.xmin,
rect_ofs.ymin,
rect_ofs.xmax,
rect_ofs.ymax);
}
else if (font->shadow <= 4) {
blf_texture3_draw(font->shadow_color,
g->dims,
g->offset,
rect_ofs.xmin,
rect_ofs.ymin,
rect_ofs.xmax,
rect_ofs.ymax);
}
else {
blf_texture5_draw(font->shadow_color,
g->dims,
g->offset,
rect_ofs.xmin,
rect_ofs.ymin,
rect_ofs.xmax,
rect_ofs.ymax);
}
}
rcti rect;
blf_glyph_calc_rect(&rect, g, x, y);
#if BLF_BLUR_ENABLE
switch (font->blur) {
case 3:
blf_texture3_draw(
font->color, g->dims, g->offset, rect.xmin, rect.ymin, rect.xmax, rect.ymax);
break;
case 5:
blf_texture5_draw(
font->color, g->dims, g->offset, rect.xmin, rect.ymin, rect.xmax, rect.ymax);
break;
default:
blf_texture_draw(
font->color, g->dims, g->offset, rect.xmin, rect.ymin, rect.xmax, rect.ymax);
}
#else
blf_texture_draw(font->color, g->dims, g->offset, rect.xmin, rect.ymin, rect.xmax, rect.ymax);
#endif
}
/** \} */
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