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Updated stb_textedit.h from 1.20 to 1.26 (many fixes). (#5075)
This commit is contained in:
ocornut
parent
de451d4474
commit
0cff5ac5a1
@ -63,6 +63,7 @@ Other Changes:
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- Misc: Fixed IsAnyItemHovered() returning false when using navigation.
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- Misc: Added IMGUI_STB_SPRINTF_FILENAME to support custom path to stb_sprintf. (#5068, #2954) [@jakubtomsu]
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- Misc: Added constexpr to ImVec2/ImVec4 inline constructors. (#4995) [@Myriachan]
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- Misc: Updated stb_truetype.h from 1.20 to 1.26 (many fixes). (#5075)
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- Misc: Updated stb_textedit.h from 1.13 to 1.14 (our changes so this effectively is a no-op). (#5075)
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- Misc: Updated stb_rect_pack.h from 1.00 to 1.01 (minor). (#5075)
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- Misc: binary_to_compressed_c tool: Added -nostatic option. (#5021) [@podsvirov]
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449
imstb_truetype.h
449
imstb_truetype.h
@ -1,10 +1,19 @@
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// [DEAR IMGUI]
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// This is a slightly modified version of stb_truetype.h 1.20.
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// This is a slightly modified version of stb_truetype.h 1.26.
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// Mostly fixing for compiler and static analyzer warnings.
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// Grep for [DEAR IMGUI] to find the changes.
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// stb_truetype.h - v1.20 - public domain
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// authored from 2009-2016 by Sean Barrett / RAD Game Tools
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// stb_truetype.h - v1.26 - public domain
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// authored from 2009-2021 by Sean Barrett / RAD Game Tools
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//
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// =======================================================================
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//
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// NO SECURITY GUARANTEE -- DO NOT USE THIS ON UNTRUSTED FONT FILES
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//
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// This library does no range checking of the offsets found in the file,
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// meaning an attacker can use it to read arbitrary memory.
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//
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// =======================================================================
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//
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// This library processes TrueType files:
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// parse files
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@ -37,11 +46,11 @@
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// Daniel Ribeiro Maciel
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//
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// Bug/warning reports/fixes:
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// "Zer" on mollyrocket Fabian "ryg" Giesen
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// Cass Everitt Martins Mozeiko
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// stoiko (Haemimont Games) Cap Petschulat
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// Brian Hook Omar Cornut
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// Walter van Niftrik github:aloucks
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// "Zer" on mollyrocket Fabian "ryg" Giesen github:NiLuJe
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// Cass Everitt Martins Mozeiko github:aloucks
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// stoiko (Haemimont Games) Cap Petschulat github:oyvindjam
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// Brian Hook Omar Cornut github:vassvik
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// Walter van Niftrik Ryan Griege
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// David Gow Peter LaValle
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// David Given Sergey Popov
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// Ivan-Assen Ivanov Giumo X. Clanjor
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@ -49,11 +58,17 @@
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// Johan Duparc Thomas Fields
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// Hou Qiming Derek Vinyard
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// Rob Loach Cort Stratton
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// Kenney Phillis Jr. github:oyvindjam
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// Brian Costabile github:vassvik
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// Kenney Phillis Jr. Brian Costabile
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// Ken Voskuil (kaesve)
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//
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// VERSION HISTORY
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//
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// 1.26 (2021-08-28) fix broken rasterizer
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// 1.25 (2021-07-11) many fixes
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// 1.24 (2020-02-05) fix warning
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// 1.23 (2020-02-02) query SVG data for glyphs; query whole kerning table (but only kern not GPOS)
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// 1.22 (2019-08-11) minimize missing-glyph duplication; fix kerning if both 'GPOS' and 'kern' are defined
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// 1.21 (2019-02-25) fix warning
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// 1.20 (2019-02-07) PackFontRange skips missing codepoints; GetScaleFontVMetrics()
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// 1.19 (2018-02-11) GPOS kerning, STBTT_fmod
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// 1.18 (2018-01-29) add missing function
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@ -248,19 +263,6 @@
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// recommend it.
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//
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//
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// SOURCE STATISTICS (based on v0.6c, 2050 LOC)
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//
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// Documentation & header file 520 LOC \___ 660 LOC documentation
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// Sample code 140 LOC /
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// Truetype parsing 620 LOC ---- 620 LOC TrueType
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// Software rasterization 240 LOC \.
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// Curve tessellation 120 LOC \__ 550 LOC Bitmap creation
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// Bitmap management 100 LOC /
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// Baked bitmap interface 70 LOC /
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// Font name matching & access 150 LOC ---- 150
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// C runtime library abstraction 60 LOC ---- 60
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//
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//
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// PERFORMANCE MEASUREMENTS FOR 1.06:
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//
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// 32-bit 64-bit
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@ -275,8 +277,8 @@
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//// SAMPLE PROGRAMS
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////
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//
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// Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless
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//
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// Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless.
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// See "tests/truetype_demo_win32.c" for a complete version.
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#if 0
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#define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation
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#include "stb_truetype.h"
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@ -302,6 +304,8 @@ void my_stbtt_initfont(void)
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void my_stbtt_print(float x, float y, char *text)
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{
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// assume orthographic projection with units = screen pixels, origin at top left
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glEnable(GL_TEXTURE_2D);
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glBindTexture(GL_TEXTURE_2D, ftex);
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glBegin(GL_QUADS);
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@ -309,10 +313,10 @@ void my_stbtt_print(float x, float y, char *text)
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if (*text >= 32 && *text < 128) {
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stbtt_aligned_quad q;
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stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl & d3d10+,0=d3d9
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glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y0);
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glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y0);
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glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y1);
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glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y1);
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glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y0);
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glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y0);
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glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y1);
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glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y1);
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}
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++text;
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}
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@ -719,7 +723,7 @@ struct stbtt_fontinfo
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int numGlyphs; // number of glyphs, needed for range checking
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int loca,head,glyf,hhea,hmtx,kern,gpos; // table locations as offset from start of .ttf
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int loca,head,glyf,hhea,hmtx,kern,gpos,svg; // table locations as offset from start of .ttf
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int index_map; // a cmap mapping for our chosen character encoding
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int indexToLocFormat; // format needed to map from glyph index to glyph
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@ -802,6 +806,18 @@ STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1,
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STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
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// as above, but takes one or more glyph indices for greater efficiency
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typedef struct stbtt_kerningentry
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{
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int glyph1; // use stbtt_FindGlyphIndex
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int glyph2;
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int advance;
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} stbtt_kerningentry;
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STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info);
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STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length);
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// Retrieves a complete list of all of the kerning pairs provided by the font
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// stbtt_GetKerningTable never writes more than table_length entries and returns how many entries it did write.
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// The table will be sorted by (a.glyph1 == b.glyph1)?(a.glyph2 < b.glyph2):(a.glyph1 < b.glyph1)
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//////////////////////////////////////////////////////////////////////////////
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//
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@ -846,6 +862,12 @@ STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, s
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STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
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// frees the data allocated above
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STBTT_DEF unsigned char *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl);
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STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg);
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STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg);
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// fills svg with the character's SVG data.
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// returns data size or 0 if SVG not found.
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//////////////////////////////////////////////////////////////////////////////
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//
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// BITMAP RENDERING
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@ -1347,6 +1369,22 @@ static stbtt__buf stbtt__get_subrs(stbtt__buf cff, stbtt__buf fontdict)
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return stbtt__cff_get_index(&cff);
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}
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// since most people won't use this, find this table the first time it's needed
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static int stbtt__get_svg(stbtt_fontinfo *info)
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{
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stbtt_uint32 t;
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if (info->svg < 0) {
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t = stbtt__find_table(info->data, info->fontstart, "SVG ");
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if (t) {
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stbtt_uint32 offset = ttULONG(info->data + t + 2);
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info->svg = t + offset;
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} else {
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info->svg = 0;
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}
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}
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return info->svg;
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}
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static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, int fontstart)
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{
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stbtt_uint32 cmap, t;
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@ -1426,6 +1464,8 @@ static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, in
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else
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info->numGlyphs = 0xffff;
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info->svg = -1;
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// find a cmap encoding table we understand *now* to avoid searching
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// later. (todo: could make this installable)
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// the same regardless of glyph.
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@ -1509,12 +1549,12 @@ STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codep
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search += 2;
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{
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stbtt_uint16 offset, start;
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stbtt_uint16 offset, start, last;
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stbtt_uint16 item = (stbtt_uint16) ((search - endCount) >> 1);
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STBTT_assert(unicode_codepoint <= ttUSHORT(data + endCount + 2*item));
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start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item);
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if (unicode_codepoint < start)
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last = ttUSHORT(data + endCount + 2*item);
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if (unicode_codepoint < start || unicode_codepoint > last)
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return 0;
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offset = ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item);
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@ -1774,7 +1814,7 @@ static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index, s
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}
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}
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num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
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} else if (numberOfContours == -1) {
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} else if (numberOfContours < 0) {
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// Compound shapes.
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int more = 1;
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stbtt_uint8 *comp = data + g + 10;
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@ -1841,7 +1881,7 @@ static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index, s
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if (comp_verts) STBTT_free(comp_verts, info->userdata);
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return 0;
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}
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if (num_vertices > 0) STBTT_memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex)); //-V595
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if (num_vertices > 0 && vertices) STBTT_memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex));
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STBTT_memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex));
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if (vertices) STBTT_free(vertices, info->userdata);
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vertices = tmp;
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@ -1851,9 +1891,6 @@ static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index, s
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// More components ?
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more = flags & (1<<5);
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}
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} else if (numberOfContours < 0) {
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// @TODO other compound variations?
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STBTT_assert(0);
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} else {
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// numberOfCounters == 0, do nothing
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}
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@ -2107,7 +2144,7 @@ static int stbtt__run_charstring(const stbtt_fontinfo *info, int glyph_index, st
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subrs = stbtt__cid_get_glyph_subrs(info, glyph_index);
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has_subrs = 1;
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}
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// fallthrough
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// FALLTHROUGH
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case 0x1D: // callgsubr
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if (sp < 1) return STBTT__CSERR("call(g|)subr stack");
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v = (int) s[--sp];
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@ -2212,7 +2249,7 @@ static int stbtt__run_charstring(const stbtt_fontinfo *info, int glyph_index, st
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} break;
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default:
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if (b0 != 255 && b0 != 28 && (b0 < 32 || b0 > 254)) //-V560
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if (b0 != 255 && b0 != 28 && b0 < 32)
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return STBTT__CSERR("reserved operator");
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// push immediate
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@ -2282,6 +2319,48 @@ STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_inde
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}
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}
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STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info)
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{
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stbtt_uint8 *data = info->data + info->kern;
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// we only look at the first table. it must be 'horizontal' and format 0.
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if (!info->kern)
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return 0;
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if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
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return 0;
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if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
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return 0;
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return ttUSHORT(data+10);
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}
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STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length)
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{
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stbtt_uint8 *data = info->data + info->kern;
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int k, length;
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// we only look at the first table. it must be 'horizontal' and format 0.
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if (!info->kern)
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return 0;
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if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
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return 0;
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if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
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return 0;
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length = ttUSHORT(data+10);
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if (table_length < length)
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length = table_length;
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for (k = 0; k < length; k++)
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{
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table[k].glyph1 = ttUSHORT(data+18+(k*6));
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table[k].glyph2 = ttUSHORT(data+20+(k*6));
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table[k].advance = ttSHORT(data+22+(k*6));
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}
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return length;
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}
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static int stbtt__GetGlyphKernInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
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{
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stbtt_uint8 *data = info->data + info->kern;
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@ -2336,7 +2415,8 @@ static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyp
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return m;
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}
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}
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} break;
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break;
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}
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case 2: {
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stbtt_uint16 rangeCount = ttUSHORT(coverageTable + 2);
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@ -2360,12 +2440,10 @@ static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyp
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return startCoverageIndex + glyph - strawStart;
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}
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}
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} break;
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break;
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}
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default: {
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// There are no other cases.
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STBTT_assert(0);
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} break;
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default: return -1; // unsupported
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}
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return -1;
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@ -2383,10 +2461,8 @@ static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
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if (glyph >= startGlyphID && glyph < startGlyphID + glyphCount)
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return (stbtt_int32)ttUSHORT(classDef1ValueArray + 2 * (glyph - startGlyphID));
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// [DEAR IMGUI] Commented to fix static analyzer warning
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//classDefTable = classDef1ValueArray + 2 * glyphCount;
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} break;
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break;
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}
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case 2: {
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stbtt_uint16 classRangeCount = ttUSHORT(classDefTable + 2);
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@ -2408,18 +2484,15 @@ static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
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else
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return (stbtt_int32)ttUSHORT(classRangeRecord + 4);
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}
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// [DEAR IMGUI] Commented to fix static analyzer warning
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//classDefTable = classRangeRecords + 6 * classRangeCount;
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} break;
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default: {
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// There are no other cases.
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STBTT_assert(0);
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} break;
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break;
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}
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return -1;
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default:
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return -1; // Unsupported definition type, return an error.
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}
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// "All glyphs not assigned to a class fall into class 0". (OpenType spec)
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return 0;
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}
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// Define to STBTT_assert(x) if you want to break on unimplemented formats.
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@ -2431,7 +2504,7 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
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stbtt_uint8 *lookupList;
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stbtt_uint16 lookupCount;
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stbtt_uint8 *data;
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stbtt_int32 i;
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stbtt_int32 i, sti;
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if (!info->gpos) return 0;
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@ -2451,9 +2524,9 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
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stbtt_uint16 lookupType = ttUSHORT(lookupTable);
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stbtt_uint16 subTableCount = ttUSHORT(lookupTable + 4);
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stbtt_uint8 *subTableOffsets = lookupTable + 6;
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switch(lookupType) {
|
||||
case 2: { // Pair Adjustment Positioning Subtable
|
||||
stbtt_int32 sti;
|
||||
if (lookupType != 2) // Pair Adjustment Positioning Subtable
|
||||
continue;
|
||||
|
||||
for (sti=0; sti<subTableCount; sti++) {
|
||||
stbtt_uint16 subtableOffset = ttUSHORT(subTableOffsets + 2 * sti);
|
||||
stbtt_uint8 *table = lookupTable + subtableOffset;
|
||||
@ -2468,20 +2541,15 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
|
||||
int straw, needle;
|
||||
stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
|
||||
stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
|
||||
if (valueFormat1 == 4 && valueFormat2 == 0) { // Support more formats?
|
||||
stbtt_int32 valueRecordPairSizeInBytes = 2;
|
||||
stbtt_uint16 pairSetCount = ttUSHORT(table + 8);
|
||||
stbtt_uint16 pairPosOffset = ttUSHORT(table + 10 + 2 * coverageIndex);
|
||||
stbtt_uint8 *pairValueTable = table + pairPosOffset;
|
||||
stbtt_uint16 pairValueCount = ttUSHORT(pairValueTable);
|
||||
stbtt_uint8 *pairValueArray = pairValueTable + 2;
|
||||
// TODO: Support more formats.
|
||||
STBTT_GPOS_TODO_assert(valueFormat1 == 4);
|
||||
if (valueFormat1 != 4) return 0;
|
||||
STBTT_GPOS_TODO_assert(valueFormat2 == 0);
|
||||
if (valueFormat2 != 0) return 0;
|
||||
|
||||
STBTT_assert(coverageIndex < pairSetCount);
|
||||
STBTT__NOTUSED(pairSetCount);
|
||||
if (coverageIndex >= pairSetCount) return 0;
|
||||
|
||||
needle=glyph2;
|
||||
r=pairValueCount-1;
|
||||
@ -2504,12 +2572,15 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
|
||||
return xAdvance;
|
||||
}
|
||||
}
|
||||
} break;
|
||||
} else
|
||||
return 0;
|
||||
break;
|
||||
}
|
||||
|
||||
case 2: {
|
||||
stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
|
||||
stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
|
||||
|
||||
if (valueFormat1 == 4 && valueFormat2 == 0) { // Support more formats?
|
||||
stbtt_uint16 classDef1Offset = ttUSHORT(table + 8);
|
||||
stbtt_uint16 classDef2Offset = ttUSHORT(table + 10);
|
||||
int glyph1class = stbtt__GetGlyphClass(table + classDef1Offset, glyph1);
|
||||
@ -2517,36 +2588,24 @@ static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, i
|
||||
|
||||
stbtt_uint16 class1Count = ttUSHORT(table + 12);
|
||||
stbtt_uint16 class2Count = ttUSHORT(table + 14);
|
||||
STBTT_assert(glyph1class < class1Count);
|
||||
STBTT_assert(glyph2class < class2Count);
|
||||
stbtt_uint8 *class1Records, *class2Records;
|
||||
stbtt_int16 xAdvance;
|
||||
|
||||
// TODO: Support more formats.
|
||||
STBTT_GPOS_TODO_assert(valueFormat1 == 4);
|
||||
if (valueFormat1 != 4) return 0;
|
||||
STBTT_GPOS_TODO_assert(valueFormat2 == 0);
|
||||
if (valueFormat2 != 0) return 0;
|
||||
if (glyph1class < 0 || glyph1class >= class1Count) return 0; // malformed
|
||||
if (glyph2class < 0 || glyph2class >= class2Count) return 0; // malformed
|
||||
|
||||
if (glyph1class >= 0 && glyph1class < class1Count && glyph2class >= 0 && glyph2class < class2Count) {
|
||||
stbtt_uint8 *class1Records = table + 16;
|
||||
stbtt_uint8 *class2Records = class1Records + 2 * (glyph1class * class2Count);
|
||||
stbtt_int16 xAdvance = ttSHORT(class2Records + 2 * glyph2class);
|
||||
class1Records = table + 16;
|
||||
class2Records = class1Records + 2 * (glyph1class * class2Count);
|
||||
xAdvance = ttSHORT(class2Records + 2 * glyph2class);
|
||||
return xAdvance;
|
||||
}
|
||||
} break;
|
||||
|
||||
default: {
|
||||
// There are no other cases.
|
||||
STBTT_assert(0);
|
||||
} else
|
||||
return 0;
|
||||
break;
|
||||
} // [DEAR IMGUI] removed ;
|
||||
}
|
||||
}
|
||||
break;
|
||||
} // [DEAR IMGUI] removed ;
|
||||
|
||||
default:
|
||||
// TODO: Implement other stuff.
|
||||
break;
|
||||
return 0; // Unsupported position format
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -2559,8 +2618,7 @@ STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int g1, int
|
||||
|
||||
if (info->gpos)
|
||||
xAdvance += stbtt__GetGlyphGPOSInfoAdvance(info, g1, g2);
|
||||
|
||||
if (info->kern)
|
||||
else if (info->kern)
|
||||
xAdvance += stbtt__GetGlyphKernInfoAdvance(info, g1, g2);
|
||||
|
||||
return xAdvance;
|
||||
@ -2621,6 +2679,45 @@ STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
|
||||
STBTT_free(v, info->userdata);
|
||||
}
|
||||
|
||||
STBTT_DEF stbtt_uint8 *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl)
|
||||
{
|
||||
int i;
|
||||
stbtt_uint8 *data = info->data;
|
||||
stbtt_uint8 *svg_doc_list = data + stbtt__get_svg((stbtt_fontinfo *) info);
|
||||
|
||||
int numEntries = ttUSHORT(svg_doc_list);
|
||||
stbtt_uint8 *svg_docs = svg_doc_list + 2;
|
||||
|
||||
for(i=0; i<numEntries; i++) {
|
||||
stbtt_uint8 *svg_doc = svg_docs + (12 * i);
|
||||
if ((gl >= ttUSHORT(svg_doc)) && (gl <= ttUSHORT(svg_doc + 2)))
|
||||
return svg_doc;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg)
|
||||
{
|
||||
stbtt_uint8 *data = info->data;
|
||||
stbtt_uint8 *svg_doc;
|
||||
|
||||
if (info->svg == 0)
|
||||
return 0;
|
||||
|
||||
svg_doc = stbtt_FindSVGDoc(info, gl);
|
||||
if (svg_doc != NULL) {
|
||||
*svg = (char *) data + info->svg + ttULONG(svg_doc + 4);
|
||||
return ttULONG(svg_doc + 8);
|
||||
} else {
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg)
|
||||
{
|
||||
return stbtt_GetGlyphSVG(info, stbtt_FindGlyphIndex(info, unicode_codepoint), svg);
|
||||
}
|
||||
|
||||
//////////////////////////////////////////////////////////////////////////////
|
||||
//
|
||||
// antialiasing software rasterizer
|
||||
@ -2970,6 +3067,23 @@ static void stbtt__handle_clipped_edge(float *scanline, int x, stbtt__active_edg
|
||||
}
|
||||
}
|
||||
|
||||
static float stbtt__sized_trapezoid_area(float height, float top_width, float bottom_width)
|
||||
{
|
||||
STBTT_assert(top_width >= 0);
|
||||
STBTT_assert(bottom_width >= 0);
|
||||
return (top_width + bottom_width) / 2.0f * height;
|
||||
}
|
||||
|
||||
static float stbtt__position_trapezoid_area(float height, float tx0, float tx1, float bx0, float bx1)
|
||||
{
|
||||
return stbtt__sized_trapezoid_area(height, tx1 - tx0, bx1 - bx0);
|
||||
}
|
||||
|
||||
static float stbtt__sized_triangle_area(float height, float width)
|
||||
{
|
||||
return height * width / 2;
|
||||
}
|
||||
|
||||
static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill, int len, stbtt__active_edge *e, float y_top)
|
||||
{
|
||||
float y_bottom = y_top+1;
|
||||
@ -3024,13 +3138,13 @@ static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill,
|
||||
float height;
|
||||
// simple case, only spans one pixel
|
||||
int x = (int) x_top;
|
||||
height = sy1 - sy0;
|
||||
height = (sy1 - sy0) * e->direction;
|
||||
STBTT_assert(x >= 0 && x < len);
|
||||
scanline[x] += e->direction * (1-((x_top - x) + (x_bottom-x))/2) * height;
|
||||
scanline_fill[x] += e->direction * height; // everything right of this pixel is filled
|
||||
scanline[x] += stbtt__position_trapezoid_area(height, x_top, x+1.0f, x_bottom, x+1.0f);
|
||||
scanline_fill[x] += height; // everything right of this pixel is filled
|
||||
} else {
|
||||
int x,x1,x2;
|
||||
float y_crossing, step, sign, area;
|
||||
float y_crossing, y_final, step, sign, area;
|
||||
// covers 2+ pixels
|
||||
if (x_top > x_bottom) {
|
||||
// flip scanline vertically; signed area is the same
|
||||
@ -3042,32 +3156,80 @@ static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill,
|
||||
dx = -dx;
|
||||
dy = -dy;
|
||||
t = x0, x0 = xb, xb = t;
|
||||
// [DEAR IMGUI] Fix static analyzer warning
|
||||
(void)dx; // [ImGui: fix static analyzer warning]
|
||||
}
|
||||
STBTT_assert(dy >= 0);
|
||||
STBTT_assert(dx >= 0);
|
||||
|
||||
x1 = (int) x_top;
|
||||
x2 = (int) x_bottom;
|
||||
// compute intersection with y axis at x1+1
|
||||
y_crossing = (x1+1 - x0) * dy + y_top;
|
||||
y_crossing = y_top + dy * (x1+1 - x0);
|
||||
|
||||
// compute intersection with y axis at x2
|
||||
y_final = y_top + dy * (x2 - x0);
|
||||
|
||||
// x1 x_top x2 x_bottom
|
||||
// y_top +------|-----+------------+------------+--------|---+------------+
|
||||
// | | | | | |
|
||||
// | | | | | |
|
||||
// sy0 | Txxxxx|............|............|............|............|
|
||||
// y_crossing | *xxxxx.......|............|............|............|
|
||||
// | | xxxxx..|............|............|............|
|
||||
// | | /- xx*xxxx........|............|............|
|
||||
// | | dy < | xxxxxx..|............|............|
|
||||
// y_final | | \- | xx*xxx.........|............|
|
||||
// sy1 | | | | xxxxxB...|............|
|
||||
// | | | | | |
|
||||
// | | | | | |
|
||||
// y_bottom +------------+------------+------------+------------+------------+
|
||||
//
|
||||
// goal is to measure the area covered by '.' in each pixel
|
||||
|
||||
// if x2 is right at the right edge of x1, y_crossing can blow up, github #1057
|
||||
// @TODO: maybe test against sy1 rather than y_bottom?
|
||||
if (y_crossing > y_bottom)
|
||||
y_crossing = y_bottom;
|
||||
|
||||
sign = e->direction;
|
||||
// area of the rectangle covered from y0..y_crossing
|
||||
area = sign * (y_crossing-sy0);
|
||||
// area of the triangle (x_top,y0), (x+1,y0), (x+1,y_crossing)
|
||||
scanline[x1] += area * (1-((x_top - x1)+(x1+1-x1))/2);
|
||||
|
||||
step = sign * dy;
|
||||
// area of the rectangle covered from sy0..y_crossing
|
||||
area = sign * (y_crossing-sy0);
|
||||
|
||||
// area of the triangle (x_top,sy0), (x1+1,sy0), (x1+1,y_crossing)
|
||||
scanline[x1] += stbtt__sized_triangle_area(area, x1+1 - x_top);
|
||||
|
||||
// check if final y_crossing is blown up; no test case for this
|
||||
if (y_final > y_bottom) {
|
||||
y_final = y_bottom;
|
||||
dy = (y_final - y_crossing ) / (x2 - (x1+1)); // if denom=0, y_final = y_crossing, so y_final <= y_bottom
|
||||
}
|
||||
|
||||
// in second pixel, area covered by line segment found in first pixel
|
||||
// is always a rectangle 1 wide * the height of that line segment; this
|
||||
// is exactly what the variable 'area' stores. it also gets a contribution
|
||||
// from the line segment within it. the THIRD pixel will get the first
|
||||
// pixel's rectangle contribution, the second pixel's rectangle contribution,
|
||||
// and its own contribution. the 'own contribution' is the same in every pixel except
|
||||
// the leftmost and rightmost, a trapezoid that slides down in each pixel.
|
||||
// the second pixel's contribution to the third pixel will be the
|
||||
// rectangle 1 wide times the height change in the second pixel, which is dy.
|
||||
|
||||
step = sign * dy * 1; // dy is dy/dx, change in y for every 1 change in x,
|
||||
// which multiplied by 1-pixel-width is how much pixel area changes for each step in x
|
||||
// so the area advances by 'step' every time
|
||||
|
||||
for (x = x1+1; x < x2; ++x) {
|
||||
scanline[x] += area + step/2;
|
||||
scanline[x] += area + step/2; // area of trapezoid is 1*step/2
|
||||
area += step;
|
||||
}
|
||||
y_crossing += dy * (x2 - (x1+1));
|
||||
STBTT_assert(STBTT_fabs(area) <= 1.01f); // accumulated error from area += step unless we round step down
|
||||
STBTT_assert(sy1 > y_final-0.01f);
|
||||
|
||||
STBTT_assert(STBTT_fabs(area) <= 1.01f);
|
||||
|
||||
scanline[x2] += area + sign * (1-((x2-x2)+(x_bottom-x2))/2) * (sy1-y_crossing);
|
||||
// area covered in the last pixel is the rectangle from all the pixels to the left,
|
||||
// plus the trapezoid filled by the line segment in this pixel all the way to the right edge
|
||||
scanline[x2] += area + sign * stbtt__position_trapezoid_area(sy1-y_final, (float) x2, x2+1.0f, x_bottom, x2+1.0f);
|
||||
|
||||
// the rest of the line is filled based on the total height of the line segment in this pixel
|
||||
scanline_fill[x2] += sign * (sy1-sy0);
|
||||
}
|
||||
} else {
|
||||
@ -3075,6 +3237,9 @@ static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill,
|
||||
// clipping logic. since this does not match the intended use
|
||||
// of this library, we use a different, very slow brute
|
||||
// force implementation
|
||||
// note though that this does happen some of the time because
|
||||
// x_top and x_bottom can be extrapolated at the top & bottom of
|
||||
// the shape and actually lie outside the bounding box
|
||||
int x;
|
||||
for (x=0; x < len; ++x) {
|
||||
// cases:
|
||||
@ -3989,6 +4154,7 @@ static float stbtt__oversample_shift(int oversample)
|
||||
STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
|
||||
{
|
||||
int i,j,k;
|
||||
int missing_glyph_added = 0;
|
||||
|
||||
k=0;
|
||||
for (i=0; i < num_ranges; ++i) {
|
||||
@ -4000,7 +4166,7 @@ STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stb
|
||||
int x0,y0,x1,y1;
|
||||
int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
|
||||
int glyph = stbtt_FindGlyphIndex(info, codepoint);
|
||||
if (glyph == 0 && spc->skip_missing) {
|
||||
if (glyph == 0 && (spc->skip_missing || missing_glyph_added)) {
|
||||
rects[k].w = rects[k].h = 0;
|
||||
} else {
|
||||
stbtt_GetGlyphBitmapBoxSubpixel(info,glyph,
|
||||
@ -4010,6 +4176,8 @@ STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stb
|
||||
&x0,&y0,&x1,&y1);
|
||||
rects[k].w = (stbrp_coord) (x1-x0 + spc->padding + spc->h_oversample-1);
|
||||
rects[k].h = (stbrp_coord) (y1-y0 + spc->padding + spc->v_oversample-1);
|
||||
if (glyph == 0)
|
||||
missing_glyph_added = 1;
|
||||
}
|
||||
++k;
|
||||
}
|
||||
@ -4044,7 +4212,7 @@ STBTT_DEF void stbtt_MakeGlyphBitmapSubpixelPrefilter(const stbtt_fontinfo *info
|
||||
// rects array must be big enough to accommodate all characters in the given ranges
|
||||
STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
|
||||
{
|
||||
int i,j,k, return_value = 1;
|
||||
int i,j,k, missing_glyph = -1, return_value = 1;
|
||||
|
||||
// save current values
|
||||
int old_h_over = spc->h_oversample;
|
||||
@ -4109,6 +4277,13 @@ STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const
|
||||
bc->yoff = (float) y0 * recip_v + sub_y;
|
||||
bc->xoff2 = (x0 + r->w) * recip_h + sub_x;
|
||||
bc->yoff2 = (y0 + r->h) * recip_v + sub_y;
|
||||
|
||||
if (glyph == 0)
|
||||
missing_glyph = j;
|
||||
} else if (spc->skip_missing) {
|
||||
return_value = 0;
|
||||
} else if (r->was_packed && r->w == 0 && r->h == 0 && missing_glyph >= 0) {
|
||||
ranges[i].chardata_for_range[j] = ranges[i].chardata_for_range[missing_glyph];
|
||||
} else {
|
||||
return_value = 0; // if any fail, report failure
|
||||
}
|
||||
@ -4132,7 +4307,7 @@ STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect
|
||||
STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges)
|
||||
{
|
||||
stbtt_fontinfo info;
|
||||
int i,j,n, return_value; // [DEAR IMGUI] removed = 1
|
||||
int i, j, n, return_value; // [DEAR IMGUI] removed = 1;
|
||||
//stbrp_context *context = (stbrp_context *) spc->pack_info;
|
||||
stbrp_rect *rects;
|
||||
|
||||
@ -4301,15 +4476,14 @@ static int stbtt__compute_crossings_x(float x, float y, int nverts, stbtt_vertex
|
||||
float y_frac;
|
||||
int winding = 0;
|
||||
|
||||
orig[0] = x;
|
||||
//orig[1] = y; // [DEAR IMGUI] commented double assignment
|
||||
|
||||
// make sure y never passes through a vertex of the shape
|
||||
y_frac = (float) STBTT_fmod(y, 1.0f);
|
||||
if (y_frac < 0.01f)
|
||||
y += 0.01f;
|
||||
else if (y_frac > 0.99f)
|
||||
y -= 0.01f;
|
||||
|
||||
orig[0] = x;
|
||||
orig[1] = y;
|
||||
|
||||
// test a ray from (-infinity,y) to (x,y)
|
||||
@ -4371,7 +4545,7 @@ static float stbtt__cuberoot( float x )
|
||||
return (float) STBTT_pow( x,1.0f/3.0f);
|
||||
}
|
||||
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// x^3 + c*x^2 + b*x + a = 0
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// x^3 + a*x^2 + b*x + c = 0
|
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static int stbtt__solve_cubic(float a, float b, float c, float* r)
|
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{
|
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float s = -a / 3;
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@ -4410,12 +4584,7 @@ STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float sc
|
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int w,h;
|
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unsigned char *data;
|
||||
|
||||
// if one scale is 0, use same scale for both
|
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if (scale_x == 0) scale_x = scale_y;
|
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if (scale_y == 0) {
|
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if (scale_x == 0) return NULL; // if both scales are 0, return NULL
|
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scale_y = scale_x;
|
||||
}
|
||||
if (scale == 0) return NULL;
|
||||
|
||||
stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale, scale, 0.0f,0.0f, &ix0,&iy0,&ix1,&iy1);
|
||||
|
||||
@ -4481,18 +4650,17 @@ STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float sc
|
||||
for (i=0; i < num_verts; ++i) {
|
||||
float x0 = verts[i].x*scale_x, y0 = verts[i].y*scale_y;
|
||||
|
||||
// check against every point here rather than inside line/curve primitives -- @TODO: wrong if multiple 'moves' in a row produce a garbage point, and given culling, probably more efficient to do within line/curve
|
||||
float dist2 = (x0-sx)*(x0-sx) + (y0-sy)*(y0-sy);
|
||||
if (verts[i].type == STBTT_vline && precompute[i] != 0.0f) {
|
||||
float x1 = verts[i-1].x*scale_x, y1 = verts[i-1].y*scale_y;
|
||||
|
||||
float dist,dist2 = (x0-sx)*(x0-sx) + (y0-sy)*(y0-sy);
|
||||
if (dist2 < min_dist*min_dist)
|
||||
min_dist = (float) STBTT_sqrt(dist2);
|
||||
|
||||
if (verts[i].type == STBTT_vline) {
|
||||
float x1 = verts[i-1].x*scale_x, y1 = verts[i-1].y*scale_y;
|
||||
|
||||
// coarse culling against bbox
|
||||
//if (sx > STBTT_min(x0,x1)-min_dist && sx < STBTT_max(x0,x1)+min_dist &&
|
||||
// sy > STBTT_min(y0,y1)-min_dist && sy < STBTT_max(y0,y1)+min_dist)
|
||||
float dist = (float) STBTT_fabs((x1-x0)*(y0-sy) - (y1-y0)*(x0-sx)) * precompute[i];
|
||||
dist = (float) STBTT_fabs((x1-x0)*(y0-sy) - (y1-y0)*(x0-sx)) * precompute[i];
|
||||
STBTT_assert(i != 0);
|
||||
if (dist < min_dist) {
|
||||
// check position along line
|
||||
@ -4519,7 +4687,8 @@ STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float sc
|
||||
float ax = x1-x0, ay = y1-y0;
|
||||
float bx = x0 - 2*x1 + x2, by = y0 - 2*y1 + y2;
|
||||
float mx = x0 - sx, my = y0 - sy;
|
||||
float res[3],px,py,t,it;
|
||||
float res[3] = {0.f,0.f,0.f};
|
||||
float px,py,t,it,dist2;
|
||||
float a_inv = precompute[i];
|
||||
if (a_inv == 0.0) { // if a_inv is 0, it's 2nd degree so use quadratic formula
|
||||
float a = 3*(ax*bx + ay*by);
|
||||
@ -4546,6 +4715,10 @@ STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float sc
|
||||
float d = (mx*ax+my*ay) * a_inv;
|
||||
num = stbtt__solve_cubic(b, c, d, res);
|
||||
}
|
||||
dist2 = (x0-sx)*(x0-sx) + (y0-sy)*(y0-sy);
|
||||
if (dist2 < min_dist*min_dist)
|
||||
min_dist = (float) STBTT_sqrt(dist2);
|
||||
|
||||
if (num >= 1 && res[0] >= 0.0f && res[0] <= 1.0f) {
|
||||
t = res[0], it = 1.0f - t;
|
||||
px = it*it*x0 + 2*t*it*x1 + t*t*x2;
|
||||
@ -4805,6 +4978,12 @@ STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const
|
||||
|
||||
// FULL VERSION HISTORY
|
||||
//
|
||||
// 1.25 (2021-07-11) many fixes
|
||||
// 1.24 (2020-02-05) fix warning
|
||||
// 1.23 (2020-02-02) query SVG data for glyphs; query whole kerning table (but only kern not GPOS)
|
||||
// 1.22 (2019-08-11) minimize missing-glyph duplication; fix kerning if both 'GPOS' and 'kern' are defined
|
||||
// 1.21 (2019-02-25) fix warning
|
||||
// 1.20 (2019-02-07) PackFontRange skips missing codepoints; GetScaleFontVMetrics()
|
||||
// 1.19 (2018-02-11) OpenType GPOS kerning (horizontal only), STBTT_fmod
|
||||
// 1.18 (2018-01-29) add missing function
|
||||
// 1.17 (2017-07-23) make more arguments const; doc fix
|
||||
|
||||
Loading…
Reference in New Issue
Block a user