5086 lines
195 KiB
C
5086 lines
195 KiB
C
// [DEAR IMGUI]
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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 - v1.26 - 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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// extract glyph metrics
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// extract glyph shapes
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// render glyphs to one-channel bitmaps with antialiasing (box filter)
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// render glyphs to one-channel SDF bitmaps (signed-distance field/function)
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//
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// Todo:
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// non-MS cmaps
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// crashproof on bad data
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// hinting? (no longer patented)
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// cleartype-style AA?
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// optimize: use simple memory allocator for intermediates
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// optimize: build edge-list directly from curves
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// optimize: rasterize directly from curves?
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//
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// ADDITIONAL CONTRIBUTORS
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//
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// Mikko Mononen: compound shape support, more cmap formats
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// Tor Andersson: kerning, subpixel rendering
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// Dougall Johnson: OpenType / Type 2 font handling
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// Daniel Ribeiro Maciel: basic GPOS-based kerning
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//
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// Misc other:
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// Ryan Gordon
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// Simon Glass
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// github:IntellectualKitty
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// Imanol Celaya
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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 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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// Anthony Pesch Higor Euripedes
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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. 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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// 1.17 (2017-07-23) make more arguments const; doc fix
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// 1.16 (2017-07-12) SDF support
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// 1.15 (2017-03-03) make more arguments const
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// 1.14 (2017-01-16) num-fonts-in-TTC function
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// 1.13 (2017-01-02) support OpenType fonts, certain Apple fonts
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// 1.12 (2016-10-25) suppress warnings about casting away const with -Wcast-qual
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// 1.11 (2016-04-02) fix unused-variable warning
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// 1.10 (2016-04-02) user-defined fabs(); rare memory leak; remove duplicate typedef
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// 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use allocation userdata properly
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// 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges
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// 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints;
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// variant PackFontRanges to pack and render in separate phases;
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// fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?);
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// fixed an assert() bug in the new rasterizer
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// replace assert() with STBTT_assert() in new rasterizer
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//
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// Full history can be found at the end of this file.
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//
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// LICENSE
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//
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// See end of file for license information.
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//
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// USAGE
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//
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// Include this file in whatever places need to refer to it. In ONE C/C++
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// file, write:
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// #define STB_TRUETYPE_IMPLEMENTATION
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// before the #include of this file. This expands out the actual
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// implementation into that C/C++ file.
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//
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// To make the implementation private to the file that generates the implementation,
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// #define STBTT_STATIC
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//
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// Simple 3D API (don't ship this, but it's fine for tools and quick start)
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// stbtt_BakeFontBitmap() -- bake a font to a bitmap for use as texture
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// stbtt_GetBakedQuad() -- compute quad to draw for a given char
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//
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// Improved 3D API (more shippable):
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// #include "stb_rect_pack.h" -- optional, but you really want it
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// stbtt_PackBegin()
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// stbtt_PackSetOversampling() -- for improved quality on small fonts
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// stbtt_PackFontRanges() -- pack and renders
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// stbtt_PackEnd()
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// stbtt_GetPackedQuad()
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//
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// "Load" a font file from a memory buffer (you have to keep the buffer loaded)
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// stbtt_InitFont()
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// stbtt_GetFontOffsetForIndex() -- indexing for TTC font collections
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// stbtt_GetNumberOfFonts() -- number of fonts for TTC font collections
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//
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// Render a unicode codepoint to a bitmap
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// stbtt_GetCodepointBitmap() -- allocates and returns a bitmap
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// stbtt_MakeCodepointBitmap() -- renders into bitmap you provide
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// stbtt_GetCodepointBitmapBox() -- how big the bitmap must be
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//
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// Character advance/positioning
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// stbtt_GetCodepointHMetrics()
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// stbtt_GetFontVMetrics()
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// stbtt_GetFontVMetricsOS2()
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// stbtt_GetCodepointKernAdvance()
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//
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// Starting with version 1.06, the rasterizer was replaced with a new,
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// faster and generally-more-precise rasterizer. The new rasterizer more
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// accurately measures pixel coverage for anti-aliasing, except in the case
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// where multiple shapes overlap, in which case it overestimates the AA pixel
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// coverage. Thus, anti-aliasing of intersecting shapes may look wrong. If
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// this turns out to be a problem, you can re-enable the old rasterizer with
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// #define STBTT_RASTERIZER_VERSION 1
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// which will incur about a 15% speed hit.
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//
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// ADDITIONAL DOCUMENTATION
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//
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// Immediately after this block comment are a series of sample programs.
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//
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// After the sample programs is the "header file" section. This section
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// includes documentation for each API function.
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//
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// Some important concepts to understand to use this library:
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//
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// Codepoint
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// Characters are defined by unicode codepoints, e.g. 65 is
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// uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is
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// the hiragana for "ma".
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//
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// Glyph
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// A visual character shape (every codepoint is rendered as
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// some glyph)
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//
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// Glyph index
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// A font-specific integer ID representing a glyph
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//
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// Baseline
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// Glyph shapes are defined relative to a baseline, which is the
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// bottom of uppercase characters. Characters extend both above
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// and below the baseline.
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//
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// Current Point
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// As you draw text to the screen, you keep track of a "current point"
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// which is the origin of each character. The current point's vertical
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// position is the baseline. Even "baked fonts" use this model.
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//
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// Vertical Font Metrics
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// The vertical qualities of the font, used to vertically position
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// and space the characters. See docs for stbtt_GetFontVMetrics.
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//
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// Font Size in Pixels or Points
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// The preferred interface for specifying font sizes in stb_truetype
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// is to specify how tall the font's vertical extent should be in pixels.
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// If that sounds good enough, skip the next paragraph.
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//
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// Most font APIs instead use "points", which are a common typographic
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// measurement for describing font size, defined as 72 points per inch.
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// stb_truetype provides a point API for compatibility. However, true
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// "per inch" conventions don't make much sense on computer displays
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// since different monitors have different number of pixels per
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// inch. For example, Windows traditionally uses a convention that
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// there are 96 pixels per inch, thus making 'inch' measurements have
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// nothing to do with inches, and thus effectively defining a point to
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// be 1.333 pixels. Additionally, the TrueType font data provides
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// an explicit scale factor to scale a given font's glyphs to points,
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// but the author has observed that this scale factor is often wrong
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// for non-commercial fonts, thus making fonts scaled in points
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// according to the TrueType spec incoherently sized in practice.
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//
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// DETAILED USAGE:
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//
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// Scale:
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// Select how high you want the font to be, in points or pixels.
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// Call ScaleForPixelHeight or ScaleForMappingEmToPixels to compute
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// a scale factor SF that will be used by all other functions.
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//
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// Baseline:
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// You need to select a y-coordinate that is the baseline of where
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// your text will appear. Call GetFontBoundingBox to get the baseline-relative
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// bounding box for all characters. SF*-y0 will be the distance in pixels
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// that the worst-case character could extend above the baseline, so if
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// you want the top edge of characters to appear at the top of the
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// screen where y=0, then you would set the baseline to SF*-y0.
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//
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// Current point:
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// Set the current point where the first character will appear. The
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// first character could extend left of the current point; this is font
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// dependent. You can either choose a current point that is the leftmost
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// point and hope, or add some padding, or check the bounding box or
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// left-side-bearing of the first character to be displayed and set
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// the current point based on that.
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//
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// Displaying a character:
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// Compute the bounding box of the character. It will contain signed values
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// relative to <current_point, baseline>. I.e. if it returns x0,y0,x1,y1,
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// then the character should be displayed in the rectangle from
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// <current_point+SF*x0, baseline+SF*y0> to <current_point+SF*x1,baseline+SF*y1).
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//
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// Advancing for the next character:
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// Call GlyphHMetrics, and compute 'current_point += SF * advance'.
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//
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//
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// ADVANCED USAGE
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//
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// Quality:
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//
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// - Use the functions with Subpixel at the end to allow your characters
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// to have subpixel positioning. Since the font is anti-aliased, not
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// hinted, this is very import for quality. (This is not possible with
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// baked fonts.)
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//
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// - Kerning is now supported, and if you're supporting subpixel rendering
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// then kerning is worth using to give your text a polished look.
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//
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// Performance:
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//
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// - Convert Unicode codepoints to glyph indexes and operate on the glyphs;
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// if you don't do this, stb_truetype is forced to do the conversion on
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// every call.
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//
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// - There are a lot of memory allocations. We should modify it to take
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// a temp buffer and allocate from the temp buffer (without freeing),
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// should help performance a lot.
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//
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// NOTES
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//
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// The system uses the raw data found in the .ttf file without changing it
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// and without building auxiliary data structures. This is a bit inefficient
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// on little-endian systems (the data is big-endian), but assuming you're
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// caching the bitmaps or glyph shapes this shouldn't be a big deal.
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//
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// It appears to be very hard to programmatically determine what font a
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// given file is in a general way. I provide an API for this, but I don't
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// recommend it.
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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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// Previous release: 8.83 s 7.68 s
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// Pool allocations: 7.72 s 6.34 s
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// Inline sort : 6.54 s 5.65 s
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// New rasterizer : 5.63 s 5.00 s
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//////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////
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////
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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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// 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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unsigned char ttf_buffer[1<<20];
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unsigned char temp_bitmap[512*512];
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stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs
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GLuint ftex;
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void my_stbtt_initfont(void)
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{
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fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb"));
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stbtt_BakeFontBitmap(ttf_buffer,0, 32.0, temp_bitmap,512,512, 32,96, cdata); // no guarantee this fits!
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// can free ttf_buffer at this point
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glGenTextures(1, &ftex);
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glBindTexture(GL_TEXTURE_2D, ftex);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512,512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap);
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// can free temp_bitmap at this point
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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}
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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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while (*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.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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glEnd();
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}
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#endif
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//
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//
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//////////////////////////////////////////////////////////////////////////////
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//
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// Complete program (this compiles): get a single bitmap, print as ASCII art
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//
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#if 0
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#include <stdio.h>
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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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char ttf_buffer[1<<25];
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int main(int argc, char **argv)
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{
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stbtt_fontinfo font;
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unsigned char *bitmap;
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int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20);
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fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf", "rb"));
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stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0));
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bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0);
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for (j=0; j < h; ++j) {
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for (i=0; i < w; ++i)
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putchar(" .:ioVM@"[bitmap[j*w+i]>>5]);
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putchar('\n');
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}
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return 0;
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}
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#endif
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//
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// Output:
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//
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// .ii.
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// @@@@@@.
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// V@Mio@@o
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// :i. V@V
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// :oM@@M
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// :@@@MM@M
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// @@o o@M
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// :@@. M@M
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// @@@o@@@@
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// :M@@V:@@.
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//
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//////////////////////////////////////////////////////////////////////////////
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//
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// Complete program: print "Hello World!" banner, with bugs
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//
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#if 0
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char buffer[24<<20];
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unsigned char screen[20][79];
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int main(int arg, char **argv)
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{
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stbtt_fontinfo font;
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int i,j,ascent,baseline,ch=0;
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float scale, xpos=2; // leave a little padding in case the character extends left
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char *text = "Heljo World!"; // intentionally misspelled to show 'lj' brokenness
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fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb"));
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stbtt_InitFont(&font, buffer, 0);
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scale = stbtt_ScaleForPixelHeight(&font, 15);
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stbtt_GetFontVMetrics(&font, &ascent,0,0);
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baseline = (int) (ascent*scale);
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while (text[ch]) {
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int advance,lsb,x0,y0,x1,y1;
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float x_shift = xpos - (float) floor(xpos);
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stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb);
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stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1);
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stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]);
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// note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong
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// because this API is really for baking character bitmaps into textures. if you want to render
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// a sequence of characters, you really need to render each bitmap to a temp buffer, then
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// "alpha blend" that into the working buffer
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xpos += (advance * scale);
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if (text[ch+1])
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xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]);
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++ch;
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}
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for (j=0; j < 20; ++j) {
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for (i=0; i < 78; ++i)
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putchar(" .:ioVM@"[screen[j][i]>>5]);
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putchar('\n');
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}
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return 0;
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}
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#endif
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//////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////
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////
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//// INTEGRATION WITH YOUR CODEBASE
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////
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//// The following sections allow you to supply alternate definitions
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//// of C library functions used by stb_truetype, e.g. if you don't
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//// link with the C runtime library.
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#ifdef STB_TRUETYPE_IMPLEMENTATION
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// #define your own (u)stbtt_int8/16/32 before including to override this
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#ifndef stbtt_uint8
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typedef unsigned char stbtt_uint8;
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typedef signed char stbtt_int8;
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typedef unsigned short stbtt_uint16;
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typedef signed short stbtt_int16;
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typedef unsigned int stbtt_uint32;
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typedef signed int stbtt_int32;
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#endif
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typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1];
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typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1];
|
|
|
|
// e.g. #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
|
|
#ifndef STBTT_ifloor
|
|
#include <math.h>
|
|
#define STBTT_ifloor(x) ((int) floor(x))
|
|
#define STBTT_iceil(x) ((int) ceil(x))
|
|
#endif
|
|
|
|
#ifndef STBTT_sqrt
|
|
#include <math.h>
|
|
#define STBTT_sqrt(x) sqrt(x)
|
|
#define STBTT_pow(x,y) pow(x,y)
|
|
#endif
|
|
|
|
#ifndef STBTT_fmod
|
|
#include <math.h>
|
|
#define STBTT_fmod(x,y) fmod(x,y)
|
|
#endif
|
|
|
|
#ifndef STBTT_cos
|
|
#include <math.h>
|
|
#define STBTT_cos(x) cos(x)
|
|
#define STBTT_acos(x) acos(x)
|
|
#endif
|
|
|
|
#ifndef STBTT_fabs
|
|
#include <math.h>
|
|
#define STBTT_fabs(x) fabs(x)
|
|
#endif
|
|
|
|
// #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h
|
|
#ifndef STBTT_malloc
|
|
#include <stdlib.h>
|
|
#define STBTT_malloc(x,u) ((void)(u),malloc(x))
|
|
#define STBTT_free(x,u) ((void)(u),free(x))
|
|
#endif
|
|
|
|
#ifndef STBTT_assert
|
|
#include <assert.h>
|
|
#define STBTT_assert(x) assert(x)
|
|
#endif
|
|
|
|
#ifndef STBTT_strlen
|
|
#include <string.h>
|
|
#define STBTT_strlen(x) strlen(x)
|
|
#endif
|
|
|
|
#ifndef STBTT_memcpy
|
|
#include <string.h>
|
|
#define STBTT_memcpy memcpy
|
|
#define STBTT_memset memset
|
|
#endif
|
|
#endif
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
////
|
|
//// INTERFACE
|
|
////
|
|
////
|
|
|
|
#ifndef __STB_INCLUDE_STB_TRUETYPE_H__
|
|
#define __STB_INCLUDE_STB_TRUETYPE_H__
|
|
|
|
#ifdef STBTT_STATIC
|
|
#define STBTT_DEF static
|
|
#else
|
|
#define STBTT_DEF extern
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
// private structure
|
|
typedef struct
|
|
{
|
|
unsigned char *data;
|
|
int cursor;
|
|
int size;
|
|
} stbtt__buf;
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// TEXTURE BAKING API
|
|
//
|
|
// If you use this API, you only have to call two functions ever.
|
|
//
|
|
|
|
typedef struct
|
|
{
|
|
unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
|
|
float xoff,yoff,xadvance;
|
|
} stbtt_bakedchar;
|
|
|
|
STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset, // font location (use offset=0 for plain .ttf)
|
|
float pixel_height, // height of font in pixels
|
|
unsigned char *pixels, int pw, int ph, // bitmap to be filled in
|
|
int first_char, int num_chars, // characters to bake
|
|
stbtt_bakedchar *chardata); // you allocate this, it's num_chars long
|
|
// if return is positive, the first unused row of the bitmap
|
|
// if return is negative, returns the negative of the number of characters that fit
|
|
// if return is 0, no characters fit and no rows were used
|
|
// This uses a very crappy packing.
|
|
|
|
typedef struct
|
|
{
|
|
float x0,y0,s0,t0; // top-left
|
|
float x1,y1,s1,t1; // bottom-right
|
|
} stbtt_aligned_quad;
|
|
|
|
STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int ph, // same data as above
|
|
int char_index, // character to display
|
|
float *xpos, float *ypos, // pointers to current position in screen pixel space
|
|
stbtt_aligned_quad *q, // output: quad to draw
|
|
int opengl_fillrule); // true if opengl fill rule; false if DX9 or earlier
|
|
// Call GetBakedQuad with char_index = 'character - first_char', and it
|
|
// creates the quad you need to draw and advances the current position.
|
|
//
|
|
// The coordinate system used assumes y increases downwards.
|
|
//
|
|
// Characters will extend both above and below the current position;
|
|
// see discussion of "BASELINE" above.
|
|
//
|
|
// It's inefficient; you might want to c&p it and optimize it.
|
|
|
|
STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap);
|
|
// Query the font vertical metrics without having to create a font first.
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// NEW TEXTURE BAKING API
|
|
//
|
|
// This provides options for packing multiple fonts into one atlas, not
|
|
// perfectly but better than nothing.
|
|
|
|
typedef struct
|
|
{
|
|
unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
|
|
float xoff,yoff,xadvance;
|
|
float xoff2,yoff2;
|
|
} stbtt_packedchar;
|
|
|
|
typedef struct stbtt_pack_context stbtt_pack_context;
|
|
typedef struct stbtt_fontinfo stbtt_fontinfo;
|
|
#ifndef STB_RECT_PACK_VERSION
|
|
typedef struct stbrp_rect stbrp_rect;
|
|
#endif
|
|
|
|
STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int width, int height, int stride_in_bytes, int padding, void *alloc_context);
|
|
// Initializes a packing context stored in the passed-in stbtt_pack_context.
|
|
// Future calls using this context will pack characters into the bitmap passed
|
|
// in here: a 1-channel bitmap that is width * height. stride_in_bytes is
|
|
// the distance from one row to the next (or 0 to mean they are packed tightly
|
|
// together). "padding" is the amount of padding to leave between each
|
|
// character (normally you want '1' for bitmaps you'll use as textures with
|
|
// bilinear filtering).
|
|
//
|
|
// Returns 0 on failure, 1 on success.
|
|
|
|
STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc);
|
|
// Cleans up the packing context and frees all memory.
|
|
|
|
#define STBTT_POINT_SIZE(x) (-(x))
|
|
|
|
STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, float font_size,
|
|
int first_unicode_char_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range);
|
|
// Creates character bitmaps from the font_index'th font found in fontdata (use
|
|
// font_index=0 if you don't know what that is). It creates num_chars_in_range
|
|
// bitmaps for characters with unicode values starting at first_unicode_char_in_range
|
|
// and increasing. Data for how to render them is stored in chardata_for_range;
|
|
// pass these to stbtt_GetPackedQuad to get back renderable quads.
|
|
//
|
|
// font_size is the full height of the character from ascender to descender,
|
|
// as computed by stbtt_ScaleForPixelHeight. To use a point size as computed
|
|
// by stbtt_ScaleForMappingEmToPixels, wrap the point size in STBTT_POINT_SIZE()
|
|
// and pass that result as 'font_size':
|
|
// ..., 20 , ... // font max minus min y is 20 pixels tall
|
|
// ..., STBTT_POINT_SIZE(20), ... // 'M' is 20 pixels tall
|
|
|
|
typedef struct
|
|
{
|
|
float font_size;
|
|
int first_unicode_codepoint_in_range; // if non-zero, then the chars are continuous, and this is the first codepoint
|
|
int *array_of_unicode_codepoints; // if non-zero, then this is an array of unicode codepoints
|
|
int num_chars;
|
|
stbtt_packedchar *chardata_for_range; // output
|
|
unsigned char h_oversample, v_oversample; // don't set these, they're used internally
|
|
} stbtt_pack_range;
|
|
|
|
STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges);
|
|
// Creates character bitmaps from multiple ranges of characters stored in
|
|
// ranges. This will usually create a better-packed bitmap than multiple
|
|
// calls to stbtt_PackFontRange. Note that you can call this multiple
|
|
// times within a single PackBegin/PackEnd.
|
|
|
|
STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample);
|
|
// Oversampling a font increases the quality by allowing higher-quality subpixel
|
|
// positioning, and is especially valuable at smaller text sizes.
|
|
//
|
|
// This function sets the amount of oversampling for all following calls to
|
|
// stbtt_PackFontRange(s) or stbtt_PackFontRangesGatherRects for a given
|
|
// pack context. The default (no oversampling) is achieved by h_oversample=1
|
|
// and v_oversample=1. The total number of pixels required is
|
|
// h_oversample*v_oversample larger than the default; for example, 2x2
|
|
// oversampling requires 4x the storage of 1x1. For best results, render
|
|
// oversampled textures with bilinear filtering. Look at the readme in
|
|
// stb/tests/oversample for information about oversampled fonts
|
|
//
|
|
// To use with PackFontRangesGather etc., you must set it before calls
|
|
// call to PackFontRangesGatherRects.
|
|
|
|
STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip);
|
|
// If skip != 0, this tells stb_truetype to skip any codepoints for which
|
|
// there is no corresponding glyph. If skip=0, which is the default, then
|
|
// codepoints without a glyph recived the font's "missing character" glyph,
|
|
// typically an empty box by convention.
|
|
|
|
STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph, // same data as above
|
|
int char_index, // character to display
|
|
float *xpos, float *ypos, // pointers to current position in screen pixel space
|
|
stbtt_aligned_quad *q, // output: quad to draw
|
|
int align_to_integer);
|
|
|
|
STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects);
|
|
STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects);
|
|
STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects);
|
|
// Calling these functions in sequence is roughly equivalent to calling
|
|
// stbtt_PackFontRanges(). If you more control over the packing of multiple
|
|
// fonts, or if you want to pack custom data into a font texture, take a look
|
|
// at the source to of stbtt_PackFontRanges() and create a custom version
|
|
// using these functions, e.g. call GatherRects multiple times,
|
|
// building up a single array of rects, then call PackRects once,
|
|
// then call RenderIntoRects repeatedly. This may result in a
|
|
// better packing than calling PackFontRanges multiple times
|
|
// (or it may not).
|
|
|
|
// this is an opaque structure that you shouldn't mess with which holds
|
|
// all the context needed from PackBegin to PackEnd.
|
|
struct stbtt_pack_context {
|
|
void *user_allocator_context;
|
|
void *pack_info;
|
|
int width;
|
|
int height;
|
|
int stride_in_bytes;
|
|
int padding;
|
|
int skip_missing;
|
|
unsigned int h_oversample, v_oversample;
|
|
unsigned char *pixels;
|
|
void *nodes;
|
|
};
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// FONT LOADING
|
|
//
|
|
//
|
|
|
|
STBTT_DEF int stbtt_GetNumberOfFonts(const unsigned char *data);
|
|
// This function will determine the number of fonts in a font file. TrueType
|
|
// collection (.ttc) files may contain multiple fonts, while TrueType font
|
|
// (.ttf) files only contain one font. The number of fonts can be used for
|
|
// indexing with the previous function where the index is between zero and one
|
|
// less than the total fonts. If an error occurs, -1 is returned.
|
|
|
|
STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
|
|
// Each .ttf/.ttc file may have more than one font. Each font has a sequential
|
|
// index number starting from 0. Call this function to get the font offset for
|
|
// a given index; it returns -1 if the index is out of range. A regular .ttf
|
|
// file will only define one font and it always be at offset 0, so it will
|
|
// return '0' for index 0, and -1 for all other indices.
|
|
|
|
// The following structure is defined publicly so you can declare one on
|
|
// the stack or as a global or etc, but you should treat it as opaque.
|
|
struct stbtt_fontinfo
|
|
{
|
|
void * userdata;
|
|
unsigned char * data; // pointer to .ttf file
|
|
int fontstart; // offset of start of font
|
|
|
|
int numGlyphs; // number of glyphs, needed for range checking
|
|
|
|
int loca,head,glyf,hhea,hmtx,kern,gpos,svg; // table locations as offset from start of .ttf
|
|
int index_map; // a cmap mapping for our chosen character encoding
|
|
int indexToLocFormat; // format needed to map from glyph index to glyph
|
|
|
|
stbtt__buf cff; // cff font data
|
|
stbtt__buf charstrings; // the charstring index
|
|
stbtt__buf gsubrs; // global charstring subroutines index
|
|
stbtt__buf subrs; // private charstring subroutines index
|
|
stbtt__buf fontdicts; // array of font dicts
|
|
stbtt__buf fdselect; // map from glyph to fontdict
|
|
};
|
|
|
|
STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset);
|
|
// Given an offset into the file that defines a font, this function builds
|
|
// the necessary cached info for the rest of the system. You must allocate
|
|
// the stbtt_fontinfo yourself, and stbtt_InitFont will fill it out. You don't
|
|
// need to do anything special to free it, because the contents are pure
|
|
// value data with no additional data structures. Returns 0 on failure.
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// CHARACTER TO GLYPH-INDEX CONVERSIOn
|
|
|
|
STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint);
|
|
// If you're going to perform multiple operations on the same character
|
|
// and you want a speed-up, call this function with the character you're
|
|
// going to process, then use glyph-based functions instead of the
|
|
// codepoint-based functions.
|
|
// Returns 0 if the character codepoint is not defined in the font.
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// CHARACTER PROPERTIES
|
|
//
|
|
|
|
STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float pixels);
|
|
// computes a scale factor to produce a font whose "height" is 'pixels' tall.
|
|
// Height is measured as the distance from the highest ascender to the lowest
|
|
// descender; in other words, it's equivalent to calling stbtt_GetFontVMetrics
|
|
// and computing:
|
|
// scale = pixels / (ascent - descent)
|
|
// so if you prefer to measure height by the ascent only, use a similar calculation.
|
|
|
|
STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels);
|
|
// computes a scale factor to produce a font whose EM size is mapped to
|
|
// 'pixels' tall. This is probably what traditional APIs compute, but
|
|
// I'm not positive.
|
|
|
|
STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap);
|
|
// ascent is the coordinate above the baseline the font extends; descent
|
|
// is the coordinate below the baseline the font extends (i.e. it is typically negative)
|
|
// lineGap is the spacing between one row's descent and the next row's ascent...
|
|
// so you should advance the vertical position by "*ascent - *descent + *lineGap"
|
|
// these are expressed in unscaled coordinates, so you must multiply by
|
|
// the scale factor for a given size
|
|
|
|
STBTT_DEF int stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap);
|
|
// analogous to GetFontVMetrics, but returns the "typographic" values from the OS/2
|
|
// table (specific to MS/Windows TTF files).
|
|
//
|
|
// Returns 1 on success (table present), 0 on failure.
|
|
|
|
STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1);
|
|
// the bounding box around all possible characters
|
|
|
|
STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing);
|
|
// leftSideBearing is the offset from the current horizontal position to the left edge of the character
|
|
// advanceWidth is the offset from the current horizontal position to the next horizontal position
|
|
// these are expressed in unscaled coordinates
|
|
|
|
STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2);
|
|
// an additional amount to add to the 'advance' value between ch1 and ch2
|
|
|
|
STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1);
|
|
// Gets the bounding box of the visible part of the glyph, in unscaled coordinates
|
|
|
|
STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing);
|
|
STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2);
|
|
STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
|
|
// as above, but takes one or more glyph indices for greater efficiency
|
|
|
|
typedef struct stbtt_kerningentry
|
|
{
|
|
int glyph1; // use stbtt_FindGlyphIndex
|
|
int glyph2;
|
|
int advance;
|
|
} stbtt_kerningentry;
|
|
|
|
STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info);
|
|
STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length);
|
|
// Retrieves a complete list of all of the kerning pairs provided by the font
|
|
// stbtt_GetKerningTable never writes more than table_length entries and returns how many entries it did write.
|
|
// The table will be sorted by (a.glyph1 == b.glyph1)?(a.glyph2 < b.glyph2):(a.glyph1 < b.glyph1)
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// GLYPH SHAPES (you probably don't need these, but they have to go before
|
|
// the bitmaps for C declaration-order reasons)
|
|
//
|
|
|
|
#ifndef STBTT_vmove // you can predefine these to use different values (but why?)
|
|
enum {
|
|
STBTT_vmove=1,
|
|
STBTT_vline,
|
|
STBTT_vcurve,
|
|
STBTT_vcubic
|
|
};
|
|
#endif
|
|
|
|
#ifndef stbtt_vertex // you can predefine this to use different values
|
|
// (we share this with other code at RAD)
|
|
#define stbtt_vertex_type short // can't use stbtt_int16 because that's not visible in the header file
|
|
typedef struct
|
|
{
|
|
stbtt_vertex_type x,y,cx,cy,cx1,cy1;
|
|
unsigned char type,padding;
|
|
} stbtt_vertex;
|
|
#endif
|
|
|
|
STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index);
|
|
// returns non-zero if nothing is drawn for this glyph
|
|
|
|
STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices);
|
|
STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices);
|
|
// returns # of vertices and fills *vertices with the pointer to them
|
|
// these are expressed in "unscaled" coordinates
|
|
//
|
|
// The shape is a series of contours. Each one starts with
|
|
// a STBTT_moveto, then consists of a series of mixed
|
|
// STBTT_lineto and STBTT_curveto segments. A lineto
|
|
// draws a line from previous endpoint to its x,y; a curveto
|
|
// draws a quadratic bezier from previous endpoint to
|
|
// its x,y, using cx,cy as the bezier control point.
|
|
|
|
STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
|
|
// frees the data allocated above
|
|
|
|
STBTT_DEF unsigned char *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl);
|
|
STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg);
|
|
STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg);
|
|
// fills svg with the character's SVG data.
|
|
// returns data size or 0 if SVG not found.
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// BITMAP RENDERING
|
|
//
|
|
|
|
STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata);
|
|
// frees the bitmap allocated below
|
|
|
|
STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
|
|
// allocates a large-enough single-channel 8bpp bitmap and renders the
|
|
// specified character/glyph at the specified scale into it, with
|
|
// antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque).
|
|
// *width & *height are filled out with the width & height of the bitmap,
|
|
// which is stored left-to-right, top-to-bottom.
|
|
//
|
|
// xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap
|
|
|
|
STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
|
|
// the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel
|
|
// shift for the character
|
|
|
|
STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint);
|
|
// the same as stbtt_GetCodepointBitmap, but you pass in storage for the bitmap
|
|
// in the form of 'output', with row spacing of 'out_stride' bytes. the bitmap
|
|
// is clipped to out_w/out_h bytes. Call stbtt_GetCodepointBitmapBox to get the
|
|
// width and height and positioning info for it first.
|
|
|
|
STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint);
|
|
// same as stbtt_MakeCodepointBitmap, but you can specify a subpixel
|
|
// shift for the character
|
|
|
|
STBTT_DEF void stbtt_MakeCodepointBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int codepoint);
|
|
// same as stbtt_MakeCodepointBitmapSubpixel, but prefiltering
|
|
// is performed (see stbtt_PackSetOversampling)
|
|
|
|
STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
|
|
// get the bbox of the bitmap centered around the glyph origin; so the
|
|
// bitmap width is ix1-ix0, height is iy1-iy0, and location to place
|
|
// the bitmap top left is (leftSideBearing*scale,iy0).
|
|
// (Note that the bitmap uses y-increases-down, but the shape uses
|
|
// y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.)
|
|
|
|
STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
|
|
// same as stbtt_GetCodepointBitmapBox, but you can specify a subpixel
|
|
// shift for the character
|
|
|
|
// the following functions are equivalent to the above functions, but operate
|
|
// on glyph indices instead of Unicode codepoints (for efficiency)
|
|
STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff);
|
|
STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff);
|
|
STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph);
|
|
STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph);
|
|
STBTT_DEF void stbtt_MakeGlyphBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int glyph);
|
|
STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
|
|
STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
|
|
|
|
|
|
// @TODO: don't expose this structure
|
|
typedef struct
|
|
{
|
|
int w,h,stride;
|
|
unsigned char *pixels;
|
|
} stbtt__bitmap;
|
|
|
|
// rasterize a shape with quadratic beziers into a bitmap
|
|
STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, // 1-channel bitmap to draw into
|
|
float flatness_in_pixels, // allowable error of curve in pixels
|
|
stbtt_vertex *vertices, // array of vertices defining shape
|
|
int num_verts, // number of vertices in above array
|
|
float scale_x, float scale_y, // scale applied to input vertices
|
|
float shift_x, float shift_y, // translation applied to input vertices
|
|
int x_off, int y_off, // another translation applied to input
|
|
int invert, // if non-zero, vertically flip shape
|
|
void *userdata); // context for to STBTT_MALLOC
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Signed Distance Function (or Field) rendering
|
|
|
|
STBTT_DEF void stbtt_FreeSDF(unsigned char *bitmap, void *userdata);
|
|
// frees the SDF bitmap allocated below
|
|
|
|
STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float scale, int glyph, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff);
|
|
STBTT_DEF unsigned char * stbtt_GetCodepointSDF(const stbtt_fontinfo *info, float scale, int codepoint, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff);
|
|
// These functions compute a discretized SDF field for a single character, suitable for storing
|
|
// in a single-channel texture, sampling with bilinear filtering, and testing against
|
|
// larger than some threshold to produce scalable fonts.
|
|
// info -- the font
|
|
// scale -- controls the size of the resulting SDF bitmap, same as it would be creating a regular bitmap
|
|
// glyph/codepoint -- the character to generate the SDF for
|
|
// padding -- extra "pixels" around the character which are filled with the distance to the character (not 0),
|
|
// which allows effects like bit outlines
|
|
// onedge_value -- value 0-255 to test the SDF against to reconstruct the character (i.e. the isocontour of the character)
|
|
// pixel_dist_scale -- what value the SDF should increase by when moving one SDF "pixel" away from the edge (on the 0..255 scale)
|
|
// if positive, > onedge_value is inside; if negative, < onedge_value is inside
|
|
// width,height -- output height & width of the SDF bitmap (including padding)
|
|
// xoff,yoff -- output origin of the character
|
|
// return value -- a 2D array of bytes 0..255, width*height in size
|
|
//
|
|
// pixel_dist_scale & onedge_value are a scale & bias that allows you to make
|
|
// optimal use of the limited 0..255 for your application, trading off precision
|
|
// and special effects. SDF values outside the range 0..255 are clamped to 0..255.
|
|
//
|
|
// Example:
|
|
// scale = stbtt_ScaleForPixelHeight(22)
|
|
// padding = 5
|
|
// onedge_value = 180
|
|
// pixel_dist_scale = 180/5.0 = 36.0
|
|
//
|
|
// This will create an SDF bitmap in which the character is about 22 pixels
|
|
// high but the whole bitmap is about 22+5+5=32 pixels high. To produce a filled
|
|
// shape, sample the SDF at each pixel and fill the pixel if the SDF value
|
|
// is greater than or equal to 180/255. (You'll actually want to antialias,
|
|
// which is beyond the scope of this example.) Additionally, you can compute
|
|
// offset outlines (e.g. to stroke the character border inside & outside,
|
|
// or only outside). For example, to fill outside the character up to 3 SDF
|
|
// pixels, you would compare against (180-36.0*3)/255 = 72/255. The above
|
|
// choice of variables maps a range from 5 pixels outside the shape to
|
|
// 2 pixels inside the shape to 0..255; this is intended primarily for apply
|
|
// outside effects only (the interior range is needed to allow proper
|
|
// antialiasing of the font at *smaller* sizes)
|
|
//
|
|
// The function computes the SDF analytically at each SDF pixel, not by e.g.
|
|
// building a higher-res bitmap and approximating it. In theory the quality
|
|
// should be as high as possible for an SDF of this size & representation, but
|
|
// unclear if this is true in practice (perhaps building a higher-res bitmap
|
|
// and computing from that can allow drop-out prevention).
|
|
//
|
|
// The algorithm has not been optimized at all, so expect it to be slow
|
|
// if computing lots of characters or very large sizes.
|
|
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Finding the right font...
|
|
//
|
|
// You should really just solve this offline, keep your own tables
|
|
// of what font is what, and don't try to get it out of the .ttf file.
|
|
// That's because getting it out of the .ttf file is really hard, because
|
|
// the names in the file can appear in many possible encodings, in many
|
|
// possible languages, and e.g. if you need a case-insensitive comparison,
|
|
// the details of that depend on the encoding & language in a complex way
|
|
// (actually underspecified in truetype, but also gigantic).
|
|
//
|
|
// But you can use the provided functions in two possible ways:
|
|
// stbtt_FindMatchingFont() will use *case-sensitive* comparisons on
|
|
// unicode-encoded names to try to find the font you want;
|
|
// you can run this before calling stbtt_InitFont()
|
|
//
|
|
// stbtt_GetFontNameString() lets you get any of the various strings
|
|
// from the file yourself and do your own comparisons on them.
|
|
// You have to have called stbtt_InitFont() first.
|
|
|
|
|
|
STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags);
|
|
// returns the offset (not index) of the font that matches, or -1 if none
|
|
// if you use STBTT_MACSTYLE_DONTCARE, use a font name like "Arial Bold".
|
|
// if you use any other flag, use a font name like "Arial"; this checks
|
|
// the 'macStyle' header field; i don't know if fonts set this consistently
|
|
#define STBTT_MACSTYLE_DONTCARE 0
|
|
#define STBTT_MACSTYLE_BOLD 1
|
|
#define STBTT_MACSTYLE_ITALIC 2
|
|
#define STBTT_MACSTYLE_UNDERSCORE 4
|
|
#define STBTT_MACSTYLE_NONE 8 // <= not same as 0, this makes us check the bitfield is 0
|
|
|
|
STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2);
|
|
// returns 1/0 whether the first string interpreted as utf8 is identical to
|
|
// the second string interpreted as big-endian utf16... useful for strings from next func
|
|
|
|
STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID);
|
|
// returns the string (which may be big-endian double byte, e.g. for unicode)
|
|
// and puts the length in bytes in *length.
|
|
//
|
|
// some of the values for the IDs are below; for more see the truetype spec:
|
|
// http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html
|
|
// http://www.microsoft.com/typography/otspec/name.htm
|
|
|
|
enum { // platformID
|
|
STBTT_PLATFORM_ID_UNICODE =0,
|
|
STBTT_PLATFORM_ID_MAC =1,
|
|
STBTT_PLATFORM_ID_ISO =2,
|
|
STBTT_PLATFORM_ID_MICROSOFT =3
|
|
};
|
|
|
|
enum { // encodingID for STBTT_PLATFORM_ID_UNICODE
|
|
STBTT_UNICODE_EID_UNICODE_1_0 =0,
|
|
STBTT_UNICODE_EID_UNICODE_1_1 =1,
|
|
STBTT_UNICODE_EID_ISO_10646 =2,
|
|
STBTT_UNICODE_EID_UNICODE_2_0_BMP=3,
|
|
STBTT_UNICODE_EID_UNICODE_2_0_FULL=4
|
|
};
|
|
|
|
enum { // encodingID for STBTT_PLATFORM_ID_MICROSOFT
|
|
STBTT_MS_EID_SYMBOL =0,
|
|
STBTT_MS_EID_UNICODE_BMP =1,
|
|
STBTT_MS_EID_SHIFTJIS =2,
|
|
STBTT_MS_EID_UNICODE_FULL =10
|
|
};
|
|
|
|
enum { // encodingID for STBTT_PLATFORM_ID_MAC; same as Script Manager codes
|
|
STBTT_MAC_EID_ROMAN =0, STBTT_MAC_EID_ARABIC =4,
|
|
STBTT_MAC_EID_JAPANESE =1, STBTT_MAC_EID_HEBREW =5,
|
|
STBTT_MAC_EID_CHINESE_TRAD =2, STBTT_MAC_EID_GREEK =6,
|
|
STBTT_MAC_EID_KOREAN =3, STBTT_MAC_EID_RUSSIAN =7
|
|
};
|
|
|
|
enum { // languageID for STBTT_PLATFORM_ID_MICROSOFT; same as LCID...
|
|
// problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs
|
|
STBTT_MS_LANG_ENGLISH =0x0409, STBTT_MS_LANG_ITALIAN =0x0410,
|
|
STBTT_MS_LANG_CHINESE =0x0804, STBTT_MS_LANG_JAPANESE =0x0411,
|
|
STBTT_MS_LANG_DUTCH =0x0413, STBTT_MS_LANG_KOREAN =0x0412,
|
|
STBTT_MS_LANG_FRENCH =0x040c, STBTT_MS_LANG_RUSSIAN =0x0419,
|
|
STBTT_MS_LANG_GERMAN =0x0407, STBTT_MS_LANG_SPANISH =0x0409,
|
|
STBTT_MS_LANG_HEBREW =0x040d, STBTT_MS_LANG_SWEDISH =0x041D
|
|
};
|
|
|
|
enum { // languageID for STBTT_PLATFORM_ID_MAC
|
|
STBTT_MAC_LANG_ENGLISH =0 , STBTT_MAC_LANG_JAPANESE =11,
|
|
STBTT_MAC_LANG_ARABIC =12, STBTT_MAC_LANG_KOREAN =23,
|
|
STBTT_MAC_LANG_DUTCH =4 , STBTT_MAC_LANG_RUSSIAN =32,
|
|
STBTT_MAC_LANG_FRENCH =1 , STBTT_MAC_LANG_SPANISH =6 ,
|
|
STBTT_MAC_LANG_GERMAN =2 , STBTT_MAC_LANG_SWEDISH =5 ,
|
|
STBTT_MAC_LANG_HEBREW =10, STBTT_MAC_LANG_CHINESE_SIMPLIFIED =33,
|
|
STBTT_MAC_LANG_ITALIAN =3 , STBTT_MAC_LANG_CHINESE_TRAD =19
|
|
};
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif // __STB_INCLUDE_STB_TRUETYPE_H__
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
////
|
|
//// IMPLEMENTATION
|
|
////
|
|
////
|
|
|
|
#ifdef STB_TRUETYPE_IMPLEMENTATION
|
|
|
|
#ifndef STBTT_MAX_OVERSAMPLE
|
|
#define STBTT_MAX_OVERSAMPLE 8
|
|
#endif
|
|
|
|
#if STBTT_MAX_OVERSAMPLE > 255
|
|
#error "STBTT_MAX_OVERSAMPLE cannot be > 255"
|
|
#endif
|
|
|
|
typedef int stbtt__test_oversample_pow2[(STBTT_MAX_OVERSAMPLE & (STBTT_MAX_OVERSAMPLE-1)) == 0 ? 1 : -1];
|
|
|
|
#ifndef STBTT_RASTERIZER_VERSION
|
|
#define STBTT_RASTERIZER_VERSION 2
|
|
#endif
|
|
|
|
#ifdef _MSC_VER
|
|
#define STBTT__NOTUSED(v) (void)(v)
|
|
#else
|
|
#define STBTT__NOTUSED(v) (void)sizeof(v)
|
|
#endif
|
|
|
|
//////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// stbtt__buf helpers to parse data from file
|
|
//
|
|
|
|
static stbtt_uint8 stbtt__buf_get8(stbtt__buf *b)
|
|
{
|
|
if (b->cursor >= b->size)
|
|
return 0;
|
|
return b->data[b->cursor++];
|
|
}
|
|
|
|
static stbtt_uint8 stbtt__buf_peek8(stbtt__buf *b)
|
|
{
|
|
if (b->cursor >= b->size)
|
|
return 0;
|
|
return b->data[b->cursor];
|
|
}
|
|
|
|
static void stbtt__buf_seek(stbtt__buf *b, int o)
|
|
{
|
|
STBTT_assert(!(o > b->size || o < 0));
|
|
b->cursor = (o > b->size || o < 0) ? b->size : o;
|
|
}
|
|
|
|
static void stbtt__buf_skip(stbtt__buf *b, int o)
|
|
{
|
|
stbtt__buf_seek(b, b->cursor + o);
|
|
}
|
|
|
|
static stbtt_uint32 stbtt__buf_get(stbtt__buf *b, int n)
|
|
{
|
|
stbtt_uint32 v = 0;
|
|
int i;
|
|
STBTT_assert(n >= 1 && n <= 4);
|
|
for (i = 0; i < n; i++)
|
|
v = (v << 8) | stbtt__buf_get8(b);
|
|
return v;
|
|
}
|
|
|
|
static stbtt__buf stbtt__new_buf(const void *p, size_t size)
|
|
{
|
|
stbtt__buf r;
|
|
STBTT_assert(size < 0x40000000);
|
|
r.data = (stbtt_uint8*) p;
|
|
r.size = (int) size;
|
|
r.cursor = 0;
|
|
return r;
|
|
}
|
|
|
|
#define stbtt__buf_get16(b) stbtt__buf_get((b), 2)
|
|
#define stbtt__buf_get32(b) stbtt__buf_get((b), 4)
|
|
|
|
static stbtt__buf stbtt__buf_range(const stbtt__buf *b, int o, int s)
|
|
{
|
|
stbtt__buf r = stbtt__new_buf(NULL, 0);
|
|
if (o < 0 || s < 0 || o > b->size || s > b->size - o) return r;
|
|
r.data = b->data + o;
|
|
r.size = s;
|
|
return r;
|
|
}
|
|
|
|
static stbtt__buf stbtt__cff_get_index(stbtt__buf *b)
|
|
{
|
|
int count, start, offsize;
|
|
start = b->cursor;
|
|
count = stbtt__buf_get16(b);
|
|
if (count) {
|
|
offsize = stbtt__buf_get8(b);
|
|
STBTT_assert(offsize >= 1 && offsize <= 4);
|
|
stbtt__buf_skip(b, offsize * count);
|
|
stbtt__buf_skip(b, stbtt__buf_get(b, offsize) - 1);
|
|
}
|
|
return stbtt__buf_range(b, start, b->cursor - start);
|
|
}
|
|
|
|
static stbtt_uint32 stbtt__cff_int(stbtt__buf *b)
|
|
{
|
|
int b0 = stbtt__buf_get8(b);
|
|
if (b0 >= 32 && b0 <= 246) return b0 - 139;
|
|
else if (b0 >= 247 && b0 <= 250) return (b0 - 247)*256 + stbtt__buf_get8(b) + 108;
|
|
else if (b0 >= 251 && b0 <= 254) return -(b0 - 251)*256 - stbtt__buf_get8(b) - 108;
|
|
else if (b0 == 28) return stbtt__buf_get16(b);
|
|
else if (b0 == 29) return stbtt__buf_get32(b);
|
|
STBTT_assert(0);
|
|
return 0;
|
|
}
|
|
|
|
static void stbtt__cff_skip_operand(stbtt__buf *b) {
|
|
int v, b0 = stbtt__buf_peek8(b);
|
|
STBTT_assert(b0 >= 28);
|
|
if (b0 == 30) {
|
|
stbtt__buf_skip(b, 1);
|
|
while (b->cursor < b->size) {
|
|
v = stbtt__buf_get8(b);
|
|
if ((v & 0xF) == 0xF || (v >> 4) == 0xF)
|
|
break;
|
|
}
|
|
} else {
|
|
stbtt__cff_int(b);
|
|
}
|
|
}
|
|
|
|
static stbtt__buf stbtt__dict_get(stbtt__buf *b, int key)
|
|
{
|
|
stbtt__buf_seek(b, 0);
|
|
while (b->cursor < b->size) {
|
|
int start = b->cursor, end, op;
|
|
while (stbtt__buf_peek8(b) >= 28)
|
|
stbtt__cff_skip_operand(b);
|
|
end = b->cursor;
|
|
op = stbtt__buf_get8(b);
|
|
if (op == 12) op = stbtt__buf_get8(b) | 0x100;
|
|
if (op == key) return stbtt__buf_range(b, start, end-start);
|
|
}
|
|
return stbtt__buf_range(b, 0, 0);
|
|
}
|
|
|
|
static void stbtt__dict_get_ints(stbtt__buf *b, int key, int outcount, stbtt_uint32 *out)
|
|
{
|
|
int i;
|
|
stbtt__buf operands = stbtt__dict_get(b, key);
|
|
for (i = 0; i < outcount && operands.cursor < operands.size; i++)
|
|
out[i] = stbtt__cff_int(&operands);
|
|
}
|
|
|
|
static int stbtt__cff_index_count(stbtt__buf *b)
|
|
{
|
|
stbtt__buf_seek(b, 0);
|
|
return stbtt__buf_get16(b);
|
|
}
|
|
|
|
static stbtt__buf stbtt__cff_index_get(stbtt__buf b, int i)
|
|
{
|
|
int count, offsize, start, end;
|
|
stbtt__buf_seek(&b, 0);
|
|
count = stbtt__buf_get16(&b);
|
|
offsize = stbtt__buf_get8(&b);
|
|
STBTT_assert(i >= 0 && i < count);
|
|
STBTT_assert(offsize >= 1 && offsize <= 4);
|
|
stbtt__buf_skip(&b, i*offsize);
|
|
start = stbtt__buf_get(&b, offsize);
|
|
end = stbtt__buf_get(&b, offsize);
|
|
return stbtt__buf_range(&b, 2+(count+1)*offsize+start, end - start);
|
|
}
|
|
|
|
//////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// accessors to parse data from file
|
|
//
|
|
|
|
// on platforms that don't allow misaligned reads, if we want to allow
|
|
// truetype fonts that aren't padded to alignment, define ALLOW_UNALIGNED_TRUETYPE
|
|
|
|
#define ttBYTE(p) (* (stbtt_uint8 *) (p))
|
|
#define ttCHAR(p) (* (stbtt_int8 *) (p))
|
|
#define ttFixed(p) ttLONG(p)
|
|
|
|
static stbtt_uint16 ttUSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; }
|
|
static stbtt_int16 ttSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; }
|
|
static stbtt_uint32 ttULONG(stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
|
|
static stbtt_int32 ttLONG(stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
|
|
|
|
#define stbtt_tag4(p,c0,c1,c2,c3) ((p)[0] == (c0) && (p)[1] == (c1) && (p)[2] == (c2) && (p)[3] == (c3))
|
|
#define stbtt_tag(p,str) stbtt_tag4(p,str[0],str[1],str[2],str[3])
|
|
|
|
static int stbtt__isfont(stbtt_uint8 *font)
|
|
{
|
|
// check the version number
|
|
if (stbtt_tag4(font, '1',0,0,0)) return 1; // TrueType 1
|
|
if (stbtt_tag(font, "typ1")) return 1; // TrueType with type 1 font -- we don't support this!
|
|
if (stbtt_tag(font, "OTTO")) return 1; // OpenType with CFF
|
|
if (stbtt_tag4(font, 0,1,0,0)) return 1; // OpenType 1.0
|
|
if (stbtt_tag(font, "true")) return 1; // Apple specification for TrueType fonts
|
|
return 0;
|
|
}
|
|
|
|
// @OPTIMIZE: binary search
|
|
static stbtt_uint32 stbtt__find_table(stbtt_uint8 *data, stbtt_uint32 fontstart, const char *tag)
|
|
{
|
|
stbtt_int32 num_tables = ttUSHORT(data+fontstart+4);
|
|
stbtt_uint32 tabledir = fontstart + 12;
|
|
stbtt_int32 i;
|
|
for (i=0; i < num_tables; ++i) {
|
|
stbtt_uint32 loc = tabledir + 16*i;
|
|
if (stbtt_tag(data+loc+0, tag))
|
|
return ttULONG(data+loc+8);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int stbtt_GetFontOffsetForIndex_internal(unsigned char *font_collection, int index)
|
|
{
|
|
// if it's just a font, there's only one valid index
|
|
if (stbtt__isfont(font_collection))
|
|
return index == 0 ? 0 : -1;
|
|
|
|
// check if it's a TTC
|
|
if (stbtt_tag(font_collection, "ttcf")) {
|
|
// version 1?
|
|
if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) {
|
|
stbtt_int32 n = ttLONG(font_collection+8);
|
|
if (index >= n)
|
|
return -1;
|
|
return ttULONG(font_collection+12+index*4);
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int stbtt_GetNumberOfFonts_internal(unsigned char *font_collection)
|
|
{
|
|
// if it's just a font, there's only one valid font
|
|
if (stbtt__isfont(font_collection))
|
|
return 1;
|
|
|
|
// check if it's a TTC
|
|
if (stbtt_tag(font_collection, "ttcf")) {
|
|
// version 1?
|
|
if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) {
|
|
return ttLONG(font_collection+8);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static stbtt__buf stbtt__get_subrs(stbtt__buf cff, stbtt__buf fontdict)
|
|
{
|
|
stbtt_uint32 subrsoff = 0, private_loc[2] = { 0, 0 };
|
|
stbtt__buf pdict;
|
|
stbtt__dict_get_ints(&fontdict, 18, 2, private_loc);
|
|
if (!private_loc[1] || !private_loc[0]) return stbtt__new_buf(NULL, 0);
|
|
pdict = stbtt__buf_range(&cff, private_loc[1], private_loc[0]);
|
|
stbtt__dict_get_ints(&pdict, 19, 1, &subrsoff);
|
|
if (!subrsoff) return stbtt__new_buf(NULL, 0);
|
|
stbtt__buf_seek(&cff, private_loc[1]+subrsoff);
|
|
return stbtt__cff_get_index(&cff);
|
|
}
|
|
|
|
// since most people won't use this, find this table the first time it's needed
|
|
static int stbtt__get_svg(stbtt_fontinfo *info)
|
|
{
|
|
stbtt_uint32 t;
|
|
if (info->svg < 0) {
|
|
t = stbtt__find_table(info->data, info->fontstart, "SVG ");
|
|
if (t) {
|
|
stbtt_uint32 offset = ttULONG(info->data + t + 2);
|
|
info->svg = t + offset;
|
|
} else {
|
|
info->svg = 0;
|
|
}
|
|
}
|
|
return info->svg;
|
|
}
|
|
|
|
static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, int fontstart)
|
|
{
|
|
stbtt_uint32 cmap, t;
|
|
stbtt_int32 i,numTables;
|
|
|
|
info->data = data;
|
|
info->fontstart = fontstart;
|
|
info->cff = stbtt__new_buf(NULL, 0);
|
|
|
|
cmap = stbtt__find_table(data, fontstart, "cmap"); // required
|
|
info->loca = stbtt__find_table(data, fontstart, "loca"); // required
|
|
info->head = stbtt__find_table(data, fontstart, "head"); // required
|
|
info->glyf = stbtt__find_table(data, fontstart, "glyf"); // required
|
|
info->hhea = stbtt__find_table(data, fontstart, "hhea"); // required
|
|
info->hmtx = stbtt__find_table(data, fontstart, "hmtx"); // required
|
|
info->kern = stbtt__find_table(data, fontstart, "kern"); // not required
|
|
info->gpos = stbtt__find_table(data, fontstart, "GPOS"); // not required
|
|
|
|
if (!cmap || !info->head || !info->hhea || !info->hmtx)
|
|
return 0;
|
|
if (info->glyf) {
|
|
// required for truetype
|
|
if (!info->loca) return 0;
|
|
} else {
|
|
// initialization for CFF / Type2 fonts (OTF)
|
|
stbtt__buf b, topdict, topdictidx;
|
|
stbtt_uint32 cstype = 2, charstrings = 0, fdarrayoff = 0, fdselectoff = 0;
|
|
stbtt_uint32 cff;
|
|
|
|
cff = stbtt__find_table(data, fontstart, "CFF ");
|
|
if (!cff) return 0;
|
|
|
|
info->fontdicts = stbtt__new_buf(NULL, 0);
|
|
info->fdselect = stbtt__new_buf(NULL, 0);
|
|
|
|
// @TODO this should use size from table (not 512MB)
|
|
info->cff = stbtt__new_buf(data+cff, 512*1024*1024);
|
|
b = info->cff;
|
|
|
|
// read the header
|
|
stbtt__buf_skip(&b, 2);
|
|
stbtt__buf_seek(&b, stbtt__buf_get8(&b)); // hdrsize
|
|
|
|
// @TODO the name INDEX could list multiple fonts,
|
|
// but we just use the first one.
|
|
stbtt__cff_get_index(&b); // name INDEX
|
|
topdictidx = stbtt__cff_get_index(&b);
|
|
topdict = stbtt__cff_index_get(topdictidx, 0);
|
|
stbtt__cff_get_index(&b); // string INDEX
|
|
info->gsubrs = stbtt__cff_get_index(&b);
|
|
|
|
stbtt__dict_get_ints(&topdict, 17, 1, &charstrings);
|
|
stbtt__dict_get_ints(&topdict, 0x100 | 6, 1, &cstype);
|
|
stbtt__dict_get_ints(&topdict, 0x100 | 36, 1, &fdarrayoff);
|
|
stbtt__dict_get_ints(&topdict, 0x100 | 37, 1, &fdselectoff);
|
|
info->subrs = stbtt__get_subrs(b, topdict);
|
|
|
|
// we only support Type 2 charstrings
|
|
if (cstype != 2) return 0;
|
|
if (charstrings == 0) return 0;
|
|
|
|
if (fdarrayoff) {
|
|
// looks like a CID font
|
|
if (!fdselectoff) return 0;
|
|
stbtt__buf_seek(&b, fdarrayoff);
|
|
info->fontdicts = stbtt__cff_get_index(&b);
|
|
info->fdselect = stbtt__buf_range(&b, fdselectoff, b.size-fdselectoff);
|
|
}
|
|
|
|
stbtt__buf_seek(&b, charstrings);
|
|
info->charstrings = stbtt__cff_get_index(&b);
|
|
}
|
|
|
|
t = stbtt__find_table(data, fontstart, "maxp");
|
|
if (t)
|
|
info->numGlyphs = ttUSHORT(data+t+4);
|
|
else
|
|
info->numGlyphs = 0xffff;
|
|
|
|
info->svg = -1;
|
|
|
|
// find a cmap encoding table we understand *now* to avoid searching
|
|
// later. (todo: could make this installable)
|
|
// the same regardless of glyph.
|
|
numTables = ttUSHORT(data + cmap + 2);
|
|
info->index_map = 0;
|
|
for (i=0; i < numTables; ++i) {
|
|
stbtt_uint32 encoding_record = cmap + 4 + 8 * i;
|
|
// find an encoding we understand:
|
|
switch(ttUSHORT(data+encoding_record)) {
|
|
case STBTT_PLATFORM_ID_MICROSOFT:
|
|
switch (ttUSHORT(data+encoding_record+2)) {
|
|
case STBTT_MS_EID_UNICODE_BMP:
|
|
case STBTT_MS_EID_UNICODE_FULL:
|
|
// MS/Unicode
|
|
info->index_map = cmap + ttULONG(data+encoding_record+4);
|
|
break;
|
|
}
|
|
break;
|
|
case STBTT_PLATFORM_ID_UNICODE:
|
|
// Mac/iOS has these
|
|
// all the encodingIDs are unicode, so we don't bother to check it
|
|
info->index_map = cmap + ttULONG(data+encoding_record+4);
|
|
break;
|
|
}
|
|
}
|
|
if (info->index_map == 0)
|
|
return 0;
|
|
|
|
info->indexToLocFormat = ttUSHORT(data+info->head + 50);
|
|
return 1;
|
|
}
|
|
|
|
STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint)
|
|
{
|
|
stbtt_uint8 *data = info->data;
|
|
stbtt_uint32 index_map = info->index_map;
|
|
|
|
stbtt_uint16 format = ttUSHORT(data + index_map + 0);
|
|
if (format == 0) { // apple byte encoding
|
|
stbtt_int32 bytes = ttUSHORT(data + index_map + 2);
|
|
if (unicode_codepoint < bytes-6)
|
|
return ttBYTE(data + index_map + 6 + unicode_codepoint);
|
|
return 0;
|
|
} else if (format == 6) {
|
|
stbtt_uint32 first = ttUSHORT(data + index_map + 6);
|
|
stbtt_uint32 count = ttUSHORT(data + index_map + 8);
|
|
if ((stbtt_uint32) unicode_codepoint >= first && (stbtt_uint32) unicode_codepoint < first+count)
|
|
return ttUSHORT(data + index_map + 10 + (unicode_codepoint - first)*2);
|
|
return 0;
|
|
} else if (format == 2) {
|
|
STBTT_assert(0); // @TODO: high-byte mapping for japanese/chinese/korean
|
|
return 0;
|
|
} else if (format == 4) { // standard mapping for windows fonts: binary search collection of ranges
|
|
stbtt_uint16 segcount = ttUSHORT(data+index_map+6) >> 1;
|
|
stbtt_uint16 searchRange = ttUSHORT(data+index_map+8) >> 1;
|
|
stbtt_uint16 entrySelector = ttUSHORT(data+index_map+10);
|
|
stbtt_uint16 rangeShift = ttUSHORT(data+index_map+12) >> 1;
|
|
|
|
// do a binary search of the segments
|
|
stbtt_uint32 endCount = index_map + 14;
|
|
stbtt_uint32 search = endCount;
|
|
|
|
if (unicode_codepoint > 0xffff)
|
|
return 0;
|
|
|
|
// they lie from endCount .. endCount + segCount
|
|
// but searchRange is the nearest power of two, so...
|
|
if (unicode_codepoint >= ttUSHORT(data + search + rangeShift*2))
|
|
search += rangeShift*2;
|
|
|
|
// now decrement to bias correctly to find smallest
|
|
search -= 2;
|
|
while (entrySelector) {
|
|
stbtt_uint16 end;
|
|
searchRange >>= 1;
|
|
end = ttUSHORT(data + search + searchRange*2);
|
|
if (unicode_codepoint > end)
|
|
search += searchRange*2;
|
|
--entrySelector;
|
|
}
|
|
search += 2;
|
|
|
|
{
|
|
stbtt_uint16 offset, start, last;
|
|
stbtt_uint16 item = (stbtt_uint16) ((search - endCount) >> 1);
|
|
|
|
start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item);
|
|
last = ttUSHORT(data + endCount + 2*item);
|
|
if (unicode_codepoint < start || unicode_codepoint > last)
|
|
return 0;
|
|
|
|
offset = ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item);
|
|
if (offset == 0)
|
|
return (stbtt_uint16) (unicode_codepoint + ttSHORT(data + index_map + 14 + segcount*4 + 2 + 2*item));
|
|
|
|
return ttUSHORT(data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item);
|
|
}
|
|
} else if (format == 12 || format == 13) {
|
|
stbtt_uint32 ngroups = ttULONG(data+index_map+12);
|
|
stbtt_int32 low,high;
|
|
low = 0; high = (stbtt_int32)ngroups;
|
|
// Binary search the right group.
|
|
while (low < high) {
|
|
stbtt_int32 mid = low + ((high-low) >> 1); // rounds down, so low <= mid < high
|
|
stbtt_uint32 start_char = ttULONG(data+index_map+16+mid*12);
|
|
stbtt_uint32 end_char = ttULONG(data+index_map+16+mid*12+4);
|
|
if ((stbtt_uint32) unicode_codepoint < start_char)
|
|
high = mid;
|
|
else if ((stbtt_uint32) unicode_codepoint > end_char)
|
|
low = mid+1;
|
|
else {
|
|
stbtt_uint32 start_glyph = ttULONG(data+index_map+16+mid*12+8);
|
|
if (format == 12)
|
|
return start_glyph + unicode_codepoint-start_char;
|
|
else // format == 13
|
|
return start_glyph;
|
|
}
|
|
}
|
|
return 0; // not found
|
|
}
|
|
// @TODO
|
|
STBTT_assert(0);
|
|
return 0;
|
|
}
|
|
|
|
STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices)
|
|
{
|
|
return stbtt_GetGlyphShape(info, stbtt_FindGlyphIndex(info, unicode_codepoint), vertices);
|
|
}
|
|
|
|
static void stbtt_setvertex(stbtt_vertex *v, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy)
|
|
{
|
|
v->type = type;
|
|
v->x = (stbtt_int16) x;
|
|
v->y = (stbtt_int16) y;
|
|
v->cx = (stbtt_int16) cx;
|
|
v->cy = (stbtt_int16) cy;
|
|
}
|
|
|
|
static int stbtt__GetGlyfOffset(const stbtt_fontinfo *info, int glyph_index)
|
|
{
|
|
int g1,g2;
|
|
|
|
STBTT_assert(!info->cff.size);
|
|
|
|
if (glyph_index >= info->numGlyphs) return -1; // glyph index out of range
|
|
if (info->indexToLocFormat >= 2) return -1; // unknown index->glyph map format
|
|
|
|
if (info->indexToLocFormat == 0) {
|
|
g1 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2) * 2;
|
|
g2 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2 + 2) * 2;
|
|
} else {
|
|
g1 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4);
|
|
g2 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4 + 4);
|
|
}
|
|
|
|
return g1==g2 ? -1 : g1; // if length is 0, return -1
|
|
}
|
|
|
|
static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
|
|
|
|
STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1)
|
|
{
|
|
if (info->cff.size) {
|
|
stbtt__GetGlyphInfoT2(info, glyph_index, x0, y0, x1, y1);
|
|
} else {
|
|
int g = stbtt__GetGlyfOffset(info, glyph_index);
|
|
if (g < 0) return 0;
|
|
|
|
if (x0) *x0 = ttSHORT(info->data + g + 2);
|
|
if (y0) *y0 = ttSHORT(info->data + g + 4);
|
|
if (x1) *x1 = ttSHORT(info->data + g + 6);
|
|
if (y1) *y1 = ttSHORT(info->data + g + 8);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1)
|
|
{
|
|
return stbtt_GetGlyphBox(info, stbtt_FindGlyphIndex(info,codepoint), x0,y0,x1,y1);
|
|
}
|
|
|
|
STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index)
|
|
{
|
|
stbtt_int16 numberOfContours;
|
|
int g;
|
|
if (info->cff.size)
|
|
return stbtt__GetGlyphInfoT2(info, glyph_index, NULL, NULL, NULL, NULL) == 0;
|
|
g = stbtt__GetGlyfOffset(info, glyph_index);
|
|
if (g < 0) return 1;
|
|
numberOfContours = ttSHORT(info->data + g);
|
|
return numberOfContours == 0;
|
|
}
|
|
|
|
static int stbtt__close_shape(stbtt_vertex *vertices, int num_vertices, int was_off, int start_off,
|
|
stbtt_int32 sx, stbtt_int32 sy, stbtt_int32 scx, stbtt_int32 scy, stbtt_int32 cx, stbtt_int32 cy)
|
|
{
|
|
if (start_off) {
|
|
if (was_off)
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+scx)>>1, (cy+scy)>>1, cx,cy);
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, sx,sy,scx,scy);
|
|
} else {
|
|
if (was_off)
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve,sx,sy,cx,cy);
|
|
else
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vline,sx,sy,0,0);
|
|
}
|
|
return num_vertices;
|
|
}
|
|
|
|
static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
|
|
{
|
|
stbtt_int16 numberOfContours;
|
|
stbtt_uint8 *endPtsOfContours;
|
|
stbtt_uint8 *data = info->data;
|
|
stbtt_vertex *vertices=0;
|
|
int num_vertices=0;
|
|
int g = stbtt__GetGlyfOffset(info, glyph_index);
|
|
|
|
*pvertices = NULL;
|
|
|
|
if (g < 0) return 0;
|
|
|
|
numberOfContours = ttSHORT(data + g);
|
|
|
|
if (numberOfContours > 0) {
|
|
stbtt_uint8 flags=0,flagcount;
|
|
stbtt_int32 ins, i,j=0,m,n, next_move, was_off=0, off, start_off=0;
|
|
stbtt_int32 x,y,cx,cy,sx,sy, scx,scy;
|
|
stbtt_uint8 *points;
|
|
endPtsOfContours = (data + g + 10);
|
|
ins = ttUSHORT(data + g + 10 + numberOfContours * 2);
|
|
points = data + g + 10 + numberOfContours * 2 + 2 + ins;
|
|
|
|
n = 1+ttUSHORT(endPtsOfContours + numberOfContours*2-2);
|
|
|
|
m = n + 2*numberOfContours; // a loose bound on how many vertices we might need
|
|
vertices = (stbtt_vertex *) STBTT_malloc(m * sizeof(vertices[0]), info->userdata);
|
|
if (vertices == 0)
|
|
return 0;
|
|
|
|
next_move = 0;
|
|
flagcount=0;
|
|
|
|
// in first pass, we load uninterpreted data into the allocated array
|
|
// above, shifted to the end of the array so we won't overwrite it when
|
|
// we create our final data starting from the front
|
|
|
|
off = m - n; // starting offset for uninterpreted data, regardless of how m ends up being calculated
|
|
|
|
// first load flags
|
|
|
|
for (i=0; i < n; ++i) {
|
|
if (flagcount == 0) {
|
|
flags = *points++;
|
|
if (flags & 8)
|
|
flagcount = *points++;
|
|
} else
|
|
--flagcount;
|
|
vertices[off+i].type = flags;
|
|
}
|
|
|
|
// now load x coordinates
|
|
x=0;
|
|
for (i=0; i < n; ++i) {
|
|
flags = vertices[off+i].type;
|
|
if (flags & 2) {
|
|
stbtt_int16 dx = *points++;
|
|
x += (flags & 16) ? dx : -dx; // ???
|
|
} else {
|
|
if (!(flags & 16)) {
|
|
x = x + (stbtt_int16) (points[0]*256 + points[1]);
|
|
points += 2;
|
|
}
|
|
}
|
|
vertices[off+i].x = (stbtt_int16) x;
|
|
}
|
|
|
|
// now load y coordinates
|
|
y=0;
|
|
for (i=0; i < n; ++i) {
|
|
flags = vertices[off+i].type;
|
|
if (flags & 4) {
|
|
stbtt_int16 dy = *points++;
|
|
y += (flags & 32) ? dy : -dy; // ???
|
|
} else {
|
|
if (!(flags & 32)) {
|
|
y = y + (stbtt_int16) (points[0]*256 + points[1]);
|
|
points += 2;
|
|
}
|
|
}
|
|
vertices[off+i].y = (stbtt_int16) y;
|
|
}
|
|
|
|
// now convert them to our format
|
|
num_vertices=0;
|
|
sx = sy = cx = cy = scx = scy = 0;
|
|
for (i=0; i < n; ++i) {
|
|
flags = vertices[off+i].type;
|
|
x = (stbtt_int16) vertices[off+i].x;
|
|
y = (stbtt_int16) vertices[off+i].y;
|
|
|
|
if (next_move == i) {
|
|
if (i != 0)
|
|
num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
|
|
|
|
// now start the new one
|
|
start_off = !(flags & 1);
|
|
if (start_off) {
|
|
// if we start off with an off-curve point, then when we need to find a point on the curve
|
|
// where we can start, and we need to save some state for when we wraparound.
|
|
scx = x;
|
|
scy = y;
|
|
if (!(vertices[off+i+1].type & 1)) {
|
|
// next point is also a curve point, so interpolate an on-point curve
|
|
sx = (x + (stbtt_int32) vertices[off+i+1].x) >> 1;
|
|
sy = (y + (stbtt_int32) vertices[off+i+1].y) >> 1;
|
|
} else {
|
|
// otherwise just use the next point as our start point
|
|
sx = (stbtt_int32) vertices[off+i+1].x;
|
|
sy = (stbtt_int32) vertices[off+i+1].y;
|
|
++i; // we're using point i+1 as the starting point, so skip it
|
|
}
|
|
} else {
|
|
sx = x;
|
|
sy = y;
|
|
}
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vmove,sx,sy,0,0);
|
|
was_off = 0;
|
|
next_move = 1 + ttUSHORT(endPtsOfContours+j*2);
|
|
++j;
|
|
} else {
|
|
if (!(flags & 1)) { // if it's a curve
|
|
if (was_off) // two off-curve control points in a row means interpolate an on-curve midpoint
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+x)>>1, (cy+y)>>1, cx, cy);
|
|
cx = x;
|
|
cy = y;
|
|
was_off = 1;
|
|
} else {
|
|
if (was_off)
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, x,y, cx, cy);
|
|
else
|
|
stbtt_setvertex(&vertices[num_vertices++], STBTT_vline, x,y,0,0);
|
|
was_off = 0;
|
|
}
|
|
}
|
|
}
|
|
num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
|
|
} else if (numberOfContours < 0) {
|
|
// Compound shapes.
|
|
int more = 1;
|
|
stbtt_uint8 *comp = data + g + 10;
|
|
num_vertices = 0;
|
|
vertices = 0;
|
|
while (more) {
|
|
stbtt_uint16 flags, gidx;
|
|
int comp_num_verts = 0, i;
|
|
stbtt_vertex *comp_verts = 0, *tmp = 0;
|
|
float mtx[6] = {1,0,0,1,0,0}, m, n;
|
|
|
|
flags = ttSHORT(comp); comp+=2;
|
|
gidx = ttSHORT(comp); comp+=2;
|
|
|
|
if (flags & 2) { // XY values
|
|
if (flags & 1) { // shorts
|
|
mtx[4] = ttSHORT(comp); comp+=2;
|
|
mtx[5] = ttSHORT(comp); comp+=2;
|
|
} else {
|
|
mtx[4] = ttCHAR(comp); comp+=1;
|
|
mtx[5] = ttCHAR(comp); comp+=1;
|
|
}
|
|
}
|
|
else {
|
|
// @TODO handle matching point
|
|
STBTT_assert(0);
|
|
}
|
|
if (flags & (1<<3)) { // WE_HAVE_A_SCALE
|
|
mtx[0] = mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
mtx[1] = mtx[2] = 0;
|
|
} else if (flags & (1<<6)) { // WE_HAVE_AN_X_AND_YSCALE
|
|
mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
mtx[1] = mtx[2] = 0;
|
|
mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
} else if (flags & (1<<7)) { // WE_HAVE_A_TWO_BY_TWO
|
|
mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
mtx[1] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
mtx[2] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
|
|
}
|
|
|
|
// Find transformation scales.
|
|
m = (float) STBTT_sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]);
|
|
n = (float) STBTT_sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]);
|
|
|
|
// Get indexed glyph.
|
|
comp_num_verts = stbtt_GetGlyphShape(info, gidx, &comp_verts);
|
|
if (comp_num_verts > 0) {
|
|
// Transform vertices.
|
|
for (i = 0; i < comp_num_verts; ++i) {
|
|
stbtt_vertex* v = &comp_verts[i];
|
|
stbtt_vertex_type x,y;
|
|
x=v->x; y=v->y;
|
|
v->x = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
|
|
v->y = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
|
|
x=v->cx; y=v->cy;
|
|
v->cx = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
|
|
v->cy = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
|
|
}
|
|
// Append vertices.
|
|
tmp = (stbtt_vertex*)STBTT_malloc((num_vertices+comp_num_verts)*sizeof(stbtt_vertex), info->userdata);
|
|
if (!tmp) {
|
|
if (vertices) STBTT_free(vertices, info->userdata);
|
|
if (comp_verts) STBTT_free(comp_verts, info->userdata);
|
|
return 0;
|
|
}
|
|
if (num_vertices > 0 && vertices) STBTT_memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex));
|
|
STBTT_memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex));
|
|
if (vertices) STBTT_free(vertices, info->userdata);
|
|
vertices = tmp;
|
|
STBTT_free(comp_verts, info->userdata);
|
|
num_vertices += comp_num_verts;
|
|
}
|
|
// More components ?
|
|
more = flags & (1<<5);
|
|
}
|
|
} else {
|
|
// numberOfCounters == 0, do nothing
|
|
}
|
|
|
|
*pvertices = vertices;
|
|
return num_vertices;
|
|
}
|
|
|
|
typedef struct
|
|
{
|
|
int bounds;
|
|
int started;
|
|
float first_x, first_y;
|
|
float x, y;
|
|
stbtt_int32 min_x, max_x, min_y, max_y;
|
|
|
|
stbtt_vertex *pvertices;
|
|
int num_vertices;
|
|
} stbtt__csctx;
|
|
|
|
#define STBTT__CSCTX_INIT(bounds) {bounds,0, 0,0, 0,0, 0,0,0,0, NULL, 0}
|
|
|
|
static void stbtt__track_vertex(stbtt__csctx *c, stbtt_int32 x, stbtt_int32 y)
|
|
{
|
|
if (x > c->max_x || !c->started) c->max_x = x;
|
|
if (y > c->max_y || !c->started) c->max_y = y;
|
|
if (x < c->min_x || !c->started) c->min_x = x;
|
|
if (y < c->min_y || !c->started) c->min_y = y;
|
|
c->started = 1;
|
|
}
|
|
|
|
static void stbtt__csctx_v(stbtt__csctx *c, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy, stbtt_int32 cx1, stbtt_int32 cy1)
|
|
{
|
|
if (c->bounds) {
|
|
stbtt__track_vertex(c, x, y);
|
|
if (type == STBTT_vcubic) {
|
|
stbtt__track_vertex(c, cx, cy);
|
|
stbtt__track_vertex(c, cx1, cy1);
|
|
}
|
|
} else {
|
|
stbtt_setvertex(&c->pvertices[c->num_vertices], type, x, y, cx, cy);
|
|
c->pvertices[c->num_vertices].cx1 = (stbtt_int16) cx1;
|
|
c->pvertices[c->num_vertices].cy1 = (stbtt_int16) cy1;
|
|
}
|
|
c->num_vertices++;
|
|
}
|
|
|
|
static void stbtt__csctx_close_shape(stbtt__csctx *ctx)
|
|
{
|
|
if (ctx->first_x != ctx->x || ctx->first_y != ctx->y)
|
|
stbtt__csctx_v(ctx, STBTT_vline, (int)ctx->first_x, (int)ctx->first_y, 0, 0, 0, 0);
|
|
}
|
|
|
|
static void stbtt__csctx_rmove_to(stbtt__csctx *ctx, float dx, float dy)
|
|
{
|
|
stbtt__csctx_close_shape(ctx);
|
|
ctx->first_x = ctx->x = ctx->x + dx;
|
|
ctx->first_y = ctx->y = ctx->y + dy;
|
|
stbtt__csctx_v(ctx, STBTT_vmove, (int)ctx->x, (int)ctx->y, 0, 0, 0, 0);
|
|
}
|
|
|
|
static void stbtt__csctx_rline_to(stbtt__csctx *ctx, float dx, float dy)
|
|
{
|
|
ctx->x += dx;
|
|
ctx->y += dy;
|
|
stbtt__csctx_v(ctx, STBTT_vline, (int)ctx->x, (int)ctx->y, 0, 0, 0, 0);
|
|
}
|
|
|
|
static void stbtt__csctx_rccurve_to(stbtt__csctx *ctx, float dx1, float dy1, float dx2, float dy2, float dx3, float dy3)
|
|
{
|
|
float cx1 = ctx->x + dx1;
|
|
float cy1 = ctx->y + dy1;
|
|
float cx2 = cx1 + dx2;
|
|
float cy2 = cy1 + dy2;
|
|
ctx->x = cx2 + dx3;
|
|
ctx->y = cy2 + dy3;
|
|
stbtt__csctx_v(ctx, STBTT_vcubic, (int)ctx->x, (int)ctx->y, (int)cx1, (int)cy1, (int)cx2, (int)cy2);
|
|
}
|
|
|
|
static stbtt__buf stbtt__get_subr(stbtt__buf idx, int n)
|
|
{
|
|
int count = stbtt__cff_index_count(&idx);
|
|
int bias = 107;
|
|
if (count >= 33900)
|
|
bias = 32768;
|
|
else if (count >= 1240)
|
|
bias = 1131;
|
|
n += bias;
|
|
if (n < 0 || n >= count)
|
|
return stbtt__new_buf(NULL, 0);
|
|
return stbtt__cff_index_get(idx, n);
|
|
}
|
|
|
|
static stbtt__buf stbtt__cid_get_glyph_subrs(const stbtt_fontinfo *info, int glyph_index)
|
|
{
|
|
stbtt__buf fdselect = info->fdselect;
|
|
int nranges, start, end, v, fmt, fdselector = -1, i;
|
|
|
|
stbtt__buf_seek(&fdselect, 0);
|
|
fmt = stbtt__buf_get8(&fdselect);
|
|
if (fmt == 0) {
|
|
// untested
|
|
stbtt__buf_skip(&fdselect, glyph_index);
|
|
fdselector = stbtt__buf_get8(&fdselect);
|
|
} else if (fmt == 3) {
|
|
nranges = stbtt__buf_get16(&fdselect);
|
|
start = stbtt__buf_get16(&fdselect);
|
|
for (i = 0; i < nranges; i++) {
|
|
v = stbtt__buf_get8(&fdselect);
|
|
end = stbtt__buf_get16(&fdselect);
|
|
if (glyph_index >= start && glyph_index < end) {
|
|
fdselector = v;
|
|
break;
|
|
}
|
|
start = end;
|
|
}
|
|
}
|
|
if (fdselector == -1) return stbtt__new_buf(NULL, 0); // [DEAR IMGUI] fixed, see #6007 and nothings/stb#1422
|
|
return stbtt__get_subrs(info->cff, stbtt__cff_index_get(info->fontdicts, fdselector));
|
|
}
|
|
|
|
static int stbtt__run_charstring(const stbtt_fontinfo *info, int glyph_index, stbtt__csctx *c)
|
|
{
|
|
int in_header = 1, maskbits = 0, subr_stack_height = 0, sp = 0, v, i, b0;
|
|
int has_subrs = 0, clear_stack;
|
|
float s[48];
|
|
stbtt__buf subr_stack[10], subrs = info->subrs, b;
|
|
float f;
|
|
|
|
#define STBTT__CSERR(s) (0)
|
|
|
|
// this currently ignores the initial width value, which isn't needed if we have hmtx
|
|
b = stbtt__cff_index_get(info->charstrings, glyph_index);
|
|
while (b.cursor < b.size) {
|
|
i = 0;
|
|
clear_stack = 1;
|
|
b0 = stbtt__buf_get8(&b);
|
|
switch (b0) {
|
|
// @TODO implement hinting
|
|
case 0x13: // hintmask
|
|
case 0x14: // cntrmask
|
|
if (in_header)
|
|
maskbits += (sp / 2); // implicit "vstem"
|
|
in_header = 0;
|
|
stbtt__buf_skip(&b, (maskbits + 7) / 8);
|
|
break;
|
|
|
|
case 0x01: // hstem
|
|
case 0x03: // vstem
|
|
case 0x12: // hstemhm
|
|
case 0x17: // vstemhm
|
|
maskbits += (sp / 2);
|
|
break;
|
|
|
|
case 0x15: // rmoveto
|
|
in_header = 0;
|
|
if (sp < 2) return STBTT__CSERR("rmoveto stack");
|
|
stbtt__csctx_rmove_to(c, s[sp-2], s[sp-1]);
|
|
break;
|
|
case 0x04: // vmoveto
|
|
in_header = 0;
|
|
if (sp < 1) return STBTT__CSERR("vmoveto stack");
|
|
stbtt__csctx_rmove_to(c, 0, s[sp-1]);
|
|
break;
|
|
case 0x16: // hmoveto
|
|
in_header = 0;
|
|
if (sp < 1) return STBTT__CSERR("hmoveto stack");
|
|
stbtt__csctx_rmove_to(c, s[sp-1], 0);
|
|
break;
|
|
|
|
case 0x05: // rlineto
|
|
if (sp < 2) return STBTT__CSERR("rlineto stack");
|
|
for (; i + 1 < sp; i += 2)
|
|
stbtt__csctx_rline_to(c, s[i], s[i+1]);
|
|
break;
|
|
|
|
// hlineto/vlineto and vhcurveto/hvcurveto alternate horizontal and vertical
|
|
// starting from a different place.
|
|
|
|
case 0x07: // vlineto
|
|
if (sp < 1) return STBTT__CSERR("vlineto stack");
|
|
goto vlineto;
|
|
case 0x06: // hlineto
|
|
if (sp < 1) return STBTT__CSERR("hlineto stack");
|
|
for (;;) {
|
|
if (i >= sp) break;
|
|
stbtt__csctx_rline_to(c, s[i], 0);
|
|
i++;
|
|
vlineto:
|
|
if (i >= sp) break;
|
|
stbtt__csctx_rline_to(c, 0, s[i]);
|
|
i++;
|
|
}
|
|
break;
|
|
|
|
case 0x1F: // hvcurveto
|
|
if (sp < 4) return STBTT__CSERR("hvcurveto stack");
|
|
goto hvcurveto;
|
|
case 0x1E: // vhcurveto
|
|
if (sp < 4) return STBTT__CSERR("vhcurveto stack");
|
|
for (;;) {
|
|
if (i + 3 >= sp) break;
|
|
stbtt__csctx_rccurve_to(c, 0, s[i], s[i+1], s[i+2], s[i+3], (sp - i == 5) ? s[i + 4] : 0.0f);
|
|
i += 4;
|
|
hvcurveto:
|
|
if (i + 3 >= sp) break;
|
|
stbtt__csctx_rccurve_to(c, s[i], 0, s[i+1], s[i+2], (sp - i == 5) ? s[i+4] : 0.0f, s[i+3]);
|
|
i += 4;
|
|
}
|
|
break;
|
|
|
|
case 0x08: // rrcurveto
|
|
if (sp < 6) return STBTT__CSERR("rcurveline stack");
|
|
for (; i + 5 < sp; i += 6)
|
|
stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]);
|
|
break;
|
|
|
|
case 0x18: // rcurveline
|
|
if (sp < 8) return STBTT__CSERR("rcurveline stack");
|
|
for (; i + 5 < sp - 2; i += 6)
|
|
stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]);
|
|
if (i + 1 >= sp) return STBTT__CSERR("rcurveline stack");
|
|
stbtt__csctx_rline_to(c, s[i], s[i+1]);
|
|
break;
|
|
|
|
case 0x19: // rlinecurve
|
|
if (sp < 8) return STBTT__CSERR("rlinecurve stack");
|
|
for (; i + 1 < sp - 6; i += 2)
|
|
stbtt__csctx_rline_to(c, s[i], s[i+1]);
|
|
if (i + 5 >= sp) return STBTT__CSERR("rlinecurve stack");
|
|
stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]);
|
|
break;
|
|
|
|
case 0x1A: // vvcurveto
|
|
case 0x1B: // hhcurveto
|
|
if (sp < 4) return STBTT__CSERR("(vv|hh)curveto stack");
|
|
f = 0.0;
|
|
if (sp & 1) { f = s[i]; i++; }
|
|
for (; i + 3 < sp; i += 4) {
|
|
if (b0 == 0x1B)
|
|
stbtt__csctx_rccurve_to(c, s[i], f, s[i+1], s[i+2], s[i+3], 0.0);
|
|
else
|
|
stbtt__csctx_rccurve_to(c, f, s[i], s[i+1], s[i+2], 0.0, s[i+3]);
|
|
f = 0.0;
|
|
}
|
|
break;
|
|
|
|
case 0x0A: // callsubr
|
|
if (!has_subrs) {
|
|
if (info->fdselect.size)
|
|
subrs = stbtt__cid_get_glyph_subrs(info, glyph_index);
|
|
has_subrs = 1;
|
|
}
|
|
// FALLTHROUGH
|
|
case 0x1D: // callgsubr
|
|
if (sp < 1) return STBTT__CSERR("call(g|)subr stack");
|
|
v = (int) s[--sp];
|
|
if (subr_stack_height >= 10) return STBTT__CSERR("recursion limit");
|
|
subr_stack[subr_stack_height++] = b;
|
|
b = stbtt__get_subr(b0 == 0x0A ? subrs : info->gsubrs, v);
|
|
if (b.size == 0) return STBTT__CSERR("subr not found");
|
|
b.cursor = 0;
|
|
clear_stack = 0;
|
|
break;
|
|
|
|
case 0x0B: // return
|
|
if (subr_stack_height <= 0) return STBTT__CSERR("return outside subr");
|
|
b = subr_stack[--subr_stack_height];
|
|
clear_stack = 0;
|
|
break;
|
|
|
|
case 0x0E: // endchar
|
|
stbtt__csctx_close_shape(c);
|
|
return 1;
|
|
|
|
case 0x0C: { // two-byte escape
|
|
float dx1, dx2, dx3, dx4, dx5, dx6, dy1, dy2, dy3, dy4, dy5, dy6;
|
|
float dx, dy;
|
|
int b1 = stbtt__buf_get8(&b);
|
|
switch (b1) {
|
|
// @TODO These "flex" implementations ignore the flex-depth and resolution,
|
|
// and always draw beziers.
|
|
case 0x22: // hflex
|
|
if (sp < 7) return STBTT__CSERR("hflex stack");
|
|
dx1 = s[0];
|
|
dx2 = s[1];
|
|
dy2 = s[2];
|
|
dx3 = s[3];
|
|
dx4 = s[4];
|
|
dx5 = s[5];
|
|
dx6 = s[6];
|
|
stbtt__csctx_rccurve_to(c, dx1, 0, dx2, dy2, dx3, 0);
|
|
stbtt__csctx_rccurve_to(c, dx4, 0, dx5, -dy2, dx6, 0);
|
|
break;
|
|
|
|
case 0x23: // flex
|
|
if (sp < 13) return STBTT__CSERR("flex stack");
|
|
dx1 = s[0];
|
|
dy1 = s[1];
|
|
dx2 = s[2];
|
|
dy2 = s[3];
|
|
dx3 = s[4];
|
|
dy3 = s[5];
|
|
dx4 = s[6];
|
|
dy4 = s[7];
|
|
dx5 = s[8];
|
|
dy5 = s[9];
|
|
dx6 = s[10];
|
|
dy6 = s[11];
|
|
//fd is s[12]
|
|
stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3);
|
|
stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6);
|
|
break;
|
|
|
|
case 0x24: // hflex1
|
|
if (sp < 9) return STBTT__CSERR("hflex1 stack");
|
|
dx1 = s[0];
|
|
dy1 = s[1];
|
|
dx2 = s[2];
|
|
dy2 = s[3];
|
|
dx3 = s[4];
|
|
dx4 = s[5];
|
|
dx5 = s[6];
|
|
dy5 = s[7];
|
|
dx6 = s[8];
|
|
stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, 0);
|
|
stbtt__csctx_rccurve_to(c, dx4, 0, dx5, dy5, dx6, -(dy1+dy2+dy5));
|
|
break;
|
|
|
|
case 0x25: // flex1
|
|
if (sp < 11) return STBTT__CSERR("flex1 stack");
|
|
dx1 = s[0];
|
|
dy1 = s[1];
|
|
dx2 = s[2];
|
|
dy2 = s[3];
|
|
dx3 = s[4];
|
|
dy3 = s[5];
|
|
dx4 = s[6];
|
|
dy4 = s[7];
|
|
dx5 = s[8];
|
|
dy5 = s[9];
|
|
dx6 = dy6 = s[10];
|
|
dx = dx1+dx2+dx3+dx4+dx5;
|
|
dy = dy1+dy2+dy3+dy4+dy5;
|
|
if (STBTT_fabs(dx) > STBTT_fabs(dy))
|
|
dy6 = -dy;
|
|
else
|
|
dx6 = -dx;
|
|
stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3);
|
|
stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6);
|
|
break;
|
|
|
|
default:
|
|
return STBTT__CSERR("unimplemented");
|
|
}
|
|
} break;
|
|
|
|
default:
|
|
if (b0 != 255 && b0 != 28 && b0 < 32)
|
|
return STBTT__CSERR("reserved operator");
|
|
|
|
// push immediate
|
|
if (b0 == 255) {
|
|
f = (float)(stbtt_int32)stbtt__buf_get32(&b) / 0x10000;
|
|
} else {
|
|
stbtt__buf_skip(&b, -1);
|
|
f = (float)(stbtt_int16)stbtt__cff_int(&b);
|
|
}
|
|
if (sp >= 48) return STBTT__CSERR("push stack overflow");
|
|
s[sp++] = f;
|
|
clear_stack = 0;
|
|
break;
|
|
}
|
|
if (clear_stack) sp = 0;
|
|
}
|
|
return STBTT__CSERR("no endchar");
|
|
|
|
#undef STBTT__CSERR
|
|
}
|
|
|
|
static int stbtt__GetGlyphShapeT2(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
|
|
{
|
|
// runs the charstring twice, once to count and once to output (to avoid realloc)
|
|
stbtt__csctx count_ctx = STBTT__CSCTX_INIT(1);
|
|
stbtt__csctx output_ctx = STBTT__CSCTX_INIT(0);
|
|
if (stbtt__run_charstring(info, glyph_index, &count_ctx)) {
|
|
*pvertices = (stbtt_vertex*)STBTT_malloc(count_ctx.num_vertices*sizeof(stbtt_vertex), info->userdata);
|
|
output_ctx.pvertices = *pvertices;
|
|
if (stbtt__run_charstring(info, glyph_index, &output_ctx)) {
|
|
STBTT_assert(output_ctx.num_vertices == count_ctx.num_vertices);
|
|
return output_ctx.num_vertices;
|
|
}
|
|
}
|
|
*pvertices = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1)
|
|
{
|
|
stbtt__csctx c = STBTT__CSCTX_INIT(1);
|
|
int r = stbtt__run_charstring(info, glyph_index, &c);
|
|
if (x0) *x0 = r ? c.min_x : 0;
|
|
if (y0) *y0 = r ? c.min_y : 0;
|
|
if (x1) *x1 = r ? c.max_x : 0;
|
|
if (y1) *y1 = r ? c.max_y : 0;
|
|
return r ? c.num_vertices : 0;
|
|
}
|
|
|
|
STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
|
|
{
|
|
if (!info->cff.size)
|
|
return stbtt__GetGlyphShapeTT(info, glyph_index, pvertices);
|
|
else
|
|
return stbtt__GetGlyphShapeT2(info, glyph_index, pvertices);
|
|
}
|
|
|
|
STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing)
|
|
{
|
|
stbtt_uint16 numOfLongHorMetrics = ttUSHORT(info->data+info->hhea + 34);
|
|
if (glyph_index < numOfLongHorMetrics) {
|
|
if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*glyph_index);
|
|
if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*glyph_index + 2);
|
|
} else {
|
|
if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*(numOfLongHorMetrics-1));
|
|
if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics));
|
|
}
|
|
}
|
|
|
|
STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info)
|
|
{
|
|
stbtt_uint8 *data = info->data + info->kern;
|
|
|
|
// we only look at the first table. it must be 'horizontal' and format 0.
|
|
if (!info->kern)
|
|
return 0;
|
|
if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
|
|
return 0;
|
|
if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
|
|
return 0;
|
|
|
|
return ttUSHORT(data+10);
|
|
}
|
|
|
|
STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length)
|
|
{
|
|
stbtt_uint8 *data = info->data + info->kern;
|
|
int k, length;
|
|
|
|
// we only look at the first table. it must be 'horizontal' and format 0.
|
|
if (!info->kern)
|
|
return 0;
|
|
if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
|
|
return 0;
|
|
if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
|
|
return 0;
|
|
|
|
length = ttUSHORT(data+10);
|
|
if (table_length < length)
|
|
length = table_length;
|
|
|
|
for (k = 0; k < length; k++)
|
|
{
|
|
table[k].glyph1 = ttUSHORT(data+18+(k*6));
|
|
table[k].glyph2 = ttUSHORT(data+20+(k*6));
|
|
table[k].advance = ttSHORT(data+22+(k*6));
|
|
}
|
|
|
|
return length;
|
|
}
|
|
|
|
static int stbtt__GetGlyphKernInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
|
|
{
|
|
stbtt_uint8 *data = info->data + info->kern;
|
|
stbtt_uint32 needle, straw;
|
|
int l, r, m;
|
|
|
|
// we only look at the first table. it must be 'horizontal' and format 0.
|
|
if (!info->kern)
|
|
return 0;
|
|
if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
|
|
return 0;
|
|
if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
|
|
return 0;
|
|
|
|
l = 0;
|
|
r = ttUSHORT(data+10) - 1;
|
|
needle = glyph1 << 16 | glyph2;
|
|
while (l <= r) {
|
|
m = (l + r) >> 1;
|
|
straw = ttULONG(data+18+(m*6)); // note: unaligned read
|
|
if (needle < straw)
|
|
r = m - 1;
|
|
else if (needle > straw)
|
|
l = m + 1;
|
|
else
|
|
return ttSHORT(data+22+(m*6));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyph)
|
|
{
|
|
stbtt_uint16 coverageFormat = ttUSHORT(coverageTable);
|
|
switch (coverageFormat) {
|
|
case 1: {
|
|
stbtt_uint16 glyphCount = ttUSHORT(coverageTable + 2);
|
|
|
|
// Binary search.
|
|
stbtt_int32 l=0, r=glyphCount-1, m;
|
|
int straw, needle=glyph;
|
|
while (l <= r) {
|
|
stbtt_uint8 *glyphArray = coverageTable + 4;
|
|
stbtt_uint16 glyphID;
|
|
m = (l + r) >> 1;
|
|
glyphID = ttUSHORT(glyphArray + 2 * m);
|
|
straw = glyphID;
|
|
if (needle < straw)
|
|
r = m - 1;
|
|
else if (needle > straw)
|
|
l = m + 1;
|
|
else {
|
|
return m;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case 2: {
|
|
stbtt_uint16 rangeCount = ttUSHORT(coverageTable + 2);
|
|
stbtt_uint8 *rangeArray = coverageTable + 4;
|
|
|
|
// Binary search.
|
|
stbtt_int32 l=0, r=rangeCount-1, m;
|
|
int strawStart, strawEnd, needle=glyph;
|
|
while (l <= r) {
|
|
stbtt_uint8 *rangeRecord;
|
|
m = (l + r) >> 1;
|
|
rangeRecord = rangeArray + 6 * m;
|
|
strawStart = ttUSHORT(rangeRecord);
|
|
strawEnd = ttUSHORT(rangeRecord + 2);
|
|
if (needle < strawStart)
|
|
r = m - 1;
|
|
else if (needle > strawEnd)
|
|
l = m + 1;
|
|
else {
|
|
stbtt_uint16 startCoverageIndex = ttUSHORT(rangeRecord + 4);
|
|
return startCoverageIndex + glyph - strawStart;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
default: return -1; // unsupported
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
|
|
{
|
|
stbtt_uint16 classDefFormat = ttUSHORT(classDefTable);
|
|
switch (classDefFormat)
|
|
{
|
|
case 1: {
|
|
stbtt_uint16 startGlyphID = ttUSHORT(classDefTable + 2);
|
|
stbtt_uint16 glyphCount = ttUSHORT(classDefTable + 4);
|
|
stbtt_uint8 *classDef1ValueArray = classDefTable + 6;
|
|
|
|
if (glyph >= startGlyphID && glyph < startGlyphID + glyphCount)
|
|
return (stbtt_int32)ttUSHORT(classDef1ValueArray + 2 * (glyph - startGlyphID));
|
|
break;
|
|
}
|
|
|
|
case 2: {
|
|
stbtt_uint16 classRangeCount = ttUSHORT(classDefTable + 2);
|
|
stbtt_uint8 *classRangeRecords = classDefTable + 4;
|
|
|
|
// Binary search.
|
|
stbtt_int32 l=0, r=classRangeCount-1, m;
|
|
int strawStart, strawEnd, needle=glyph;
|
|
while (l <= r) {
|
|
stbtt_uint8 *classRangeRecord;
|
|
m = (l + r) >> 1;
|
|
classRangeRecord = classRangeRecords + 6 * m;
|
|
strawStart = ttUSHORT(classRangeRecord);
|
|
strawEnd = ttUSHORT(classRangeRecord + 2);
|
|
if (needle < strawStart)
|
|
r = m - 1;
|
|
else if (needle > strawEnd)
|
|
l = m + 1;
|
|
else
|
|
return (stbtt_int32)ttUSHORT(classRangeRecord + 4);
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
return -1; // Unsupported definition type, return an error.
|
|
}
|
|
|
|
// "All glyphs not assigned to a class fall into class 0". (OpenType spec)
|
|
return 0;
|
|
}
|
|
|
|
// Define to STBTT_assert(x) if you want to break on unimplemented formats.
|
|
#define STBTT_GPOS_TODO_assert(x)
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static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
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{
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stbtt_uint16 lookupListOffset;
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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, sti;
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if (!info->gpos) return 0;
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data = info->data + info->gpos;
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if (ttUSHORT(data+0) != 1) return 0; // Major version 1
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if (ttUSHORT(data+2) != 0) return 0; // Minor version 0
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lookupListOffset = ttUSHORT(data+8);
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lookupList = data + lookupListOffset;
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lookupCount = ttUSHORT(lookupList);
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for (i=0; i<lookupCount; ++i) {
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stbtt_uint16 lookupOffset = ttUSHORT(lookupList + 2 + 2 * i);
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stbtt_uint8 *lookupTable = lookupList + lookupOffset;
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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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if (lookupType != 2) // Pair Adjustment Positioning Subtable
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continue;
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for (sti=0; sti<subTableCount; sti++) {
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stbtt_uint16 subtableOffset = ttUSHORT(subTableOffsets + 2 * sti);
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stbtt_uint8 *table = lookupTable + subtableOffset;
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stbtt_uint16 posFormat = ttUSHORT(table);
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stbtt_uint16 coverageOffset = ttUSHORT(table + 2);
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stbtt_int32 coverageIndex = stbtt__GetCoverageIndex(table + coverageOffset, glyph1);
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if (coverageIndex == -1) continue;
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switch (posFormat) {
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case 1: {
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stbtt_int32 l, r, m;
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int straw, needle;
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stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
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stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
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if (valueFormat1 == 4 && valueFormat2 == 0) { // Support more formats?
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stbtt_int32 valueRecordPairSizeInBytes = 2;
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stbtt_uint16 pairSetCount = ttUSHORT(table + 8);
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stbtt_uint16 pairPosOffset = ttUSHORT(table + 10 + 2 * coverageIndex);
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stbtt_uint8 *pairValueTable = table + pairPosOffset;
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stbtt_uint16 pairValueCount = ttUSHORT(pairValueTable);
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stbtt_uint8 *pairValueArray = pairValueTable + 2;
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if (coverageIndex >= pairSetCount) return 0;
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