Revision: 75336
http://sourceforge.net/p/brlcad/code/75336
Author: starseeker
Date: 2020-04-10 17:02:12 +0000 (Fri, 10 Apr 2020)
Log Message:
-----------
Update to latest stb_truetype.h
Modified Paths:
--------------
brlcad/trunk/src/libdm/fontstash/stb_truetype.h
Modified: brlcad/trunk/src/libdm/fontstash/stb_truetype.h
===================================================================
--- brlcad/trunk/src/libdm/fontstash/stb_truetype.h 2020-04-10 15:48:40 UTC
(rev 75335)
+++ brlcad/trunk/src/libdm/fontstash/stb_truetype.h 2020-04-10 17:02:12 UTC
(rev 75336)
@@ -1,11 +1,21 @@
-// stb_truetype.h - v1.02 - public domain
-// authored from 2009-2014 by Sean Barrett / RAD Game Tools
+// stb_truetype.h - v1.24 - public domain
+// authored from 2009-2020 by Sean Barrett / RAD Game Tools
//
+// =======================================================================
+//
+// NO SECURITY GUARANTEE -- DO NOT USE THIS ON UNTRUSTED FONT FILES
+//
+// This library does no range checking of the offsets found in the file,
+// meaning an attacker can use it to read arbitrary memory.
+//
+// =======================================================================
+//
// This library processes TrueType files:
// parse files
// extract glyph metrics
// extract glyph shapes
// render glyphs to one-channel bitmaps with antialiasing (box filter)
+// render glyphs to one-channel SDF bitmaps (signed-distance
field/function)
//
// Todo:
// non-MS cmaps
@@ -20,63 +30,63 @@
//
// Mikko Mononen: compound shape support, more cmap formats
// Tor Andersson: kerning, subpixel rendering
+// Dougall Johnson: OpenType / Type 2 font handling
+// Daniel Ribeiro Maciel: basic GPOS-based kerning
//
-// Bug/warning reports/fixes:
-// "Zer" on mollyrocket (with fix)
-// Cass Everitt
-// stoiko (Haemimont Games)
-// Brian Hook
-// Walter van Niftrik
-// David Gow
-// David Given
-// Ivan-Assen Ivanov
-// Anthony Pesch
-// Johan Duparc
-// Hou Qiming
-// Fabian "ryg" Giesen
-//
// Misc other:
// Ryan Gordon
+// Simon Glass
+// github:IntellectualKitty
+// Imanol Celaya
+// Daniel Ribeiro Maciel
//
+// Bug/warning reports/fixes:
+// "Zer" on mollyrocket Fabian "ryg" Giesen github:NiLuJe
+// Cass Everitt Martins Mozeiko github:aloucks
+// stoiko (Haemimont Games) Cap Petschulat github:oyvindjam
+// Brian Hook Omar Cornut github:vassvik
+// Walter van Niftrik Ryan Griege
+// David Gow Peter LaValle
+// David Given Sergey Popov
+// Ivan-Assen Ivanov Giumo X. Clanjor
+// Anthony Pesch Higor Euripedes
+// Johan Duparc Thomas Fields
+// Hou Qiming Derek Vinyard
+// Rob Loach Cort Stratton
+// Kenney Phillis Jr. Brian Costabile
+// Ken Voskuil (kaesve)
+//
// VERSION HISTORY
//
-// 1.02 (2014-12-10) fix various warnings & compile issues w/ stb_rect_pack,
C++
-// 1.01 (2014-12-08) fix subpixel position when oversampling to exactly match
-// non-oversampled; STBTT_POINT_SIZE for packed case
only
-// 1.00 (2014-12-06) add new PackBegin etc. API, w/ support for oversampling
-// 0.99 (2014-09-18) fix multiple bugs with subpixel rendering (ryg)
-// 0.9 (2014-08-07) support certain mac/iOS fonts without an MS platformID
-// 0.8b (2014-07-07) fix a warning
-// 0.8 (2014-05-25) fix a few more warnings
-// 0.7 (2013-09-25) bugfix: subpixel glyph bug fixed in 0.5 had come back
-// 0.6c (2012-07-24) improve documentation
-// 0.6b (2012-07-20) fix a few more warnings
-// 0.6 (2012-07-17) fix warnings; added stbtt_ScaleForMappingEmToPixels,
-// stbtt_GetFontBoundingBox, stbtt_IsGlyphEmpty
-// 0.5 (2011-12-09) bugfixes:
-// subpixel glyph renderer computed wrong bounding box
-// first vertex of shape can be off-curve (FreeSans)
-// 0.4b (2011-12-03) fixed an error in the font baking example
-// 0.4 (2011-12-01) kerning, subpixel rendering (tor)
-// bugfixes for:
-// codepoint-to-glyph conversion using table fmt=12
-// codepoint-to-glyph conversion using table fmt=4
-// stbtt_GetBakedQuad with non-square texture (Zer)
-// updated Hello World! sample to use kerning and subpixel
-// fixed some warnings
-// 0.3 (2009-06-24) cmap fmt=12, compound shapes (MM)
-// userdata, malloc-from-userdata, non-zero fill (stb)
-// 0.2 (2009-03-11) Fix unsigned/signed char warnings
-// 0.1 (2009-03-09) First public release
+// 1.24 (2020-02-05) fix warning
+// 1.23 (2020-02-02) query SVG data for glyphs; query whole kerning table
(but only kern not GPOS)
+// 1.22 (2019-08-11) minimize missing-glyph duplication; fix kerning if both
'GPOS' and 'kern' are defined
+// 1.21 (2019-02-25) fix warning
+// 1.20 (2019-02-07) PackFontRange skips missing codepoints;
GetScaleFontVMetrics()
+// 1.19 (2018-02-11) GPOS kerning, STBTT_fmod
+// 1.18 (2018-01-29) add missing function
+// 1.17 (2017-07-23) make more arguments const; doc fix
+// 1.16 (2017-07-12) SDF support
+// 1.15 (2017-03-03) make more arguments const
+// 1.14 (2017-01-16) num-fonts-in-TTC function
+// 1.13 (2017-01-02) support OpenType fonts, certain Apple fonts
+// 1.12 (2016-10-25) suppress warnings about casting away const with
-Wcast-qual
+// 1.11 (2016-04-02) fix unused-variable warning
+// 1.10 (2016-04-02) user-defined fabs(); rare memory leak; remove duplicate
typedef
+// 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use allocation
userdata properly
+// 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical &
horizontal edges
+// 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse
codepoints;
+// variant PackFontRanges to pack and render in separate
phases;
+// fix stbtt_GetFontOFfsetForIndex (never worked for non-0
input?);
+// fixed an assert() bug in the new rasterizer
+// replace assert() with STBTT_assert() in new rasterizer
//
+// Full history can be found at the end of this file.
+//
// LICENSE
//
-// This software is in the public domain. Where that dedication is not
-// recognized, you are granted a perpetual, irrevocable license to copy
-// and modify this file as you see fit.
-
-#include "common.h"
-
+// See end of file for license information.
+//
// USAGE
//
// Include this file in whatever places need to refer to it. In ONE C/C++
@@ -85,6 +95,9 @@
// before the #include of this file. This expands out the actual
// implementation into that C/C++ file.
//
+// To make the implementation private to the file that generates the
implementation,
+// #define STBTT_STATIC
+//
// Simple 3D API (don't ship this, but it's fine for tools and quick start)
// stbtt_BakeFontBitmap() -- bake a font to a bitmap
for use as texture
// stbtt_GetBakedQuad() -- compute quad to draw for
a given char
@@ -92,14 +105,15 @@
// Improved 3D API (more shippable):
// #include "stb_rect_pack.h" -- optional, but you really
want it
// stbtt_PackBegin()
-// stbtt_PackSetOversample() -- for improved quality on
small fonts
-// stbtt_PackFontRanges()
+// stbtt_PackSetOversampling() -- for improved quality on
small fonts
+// stbtt_PackFontRanges() -- pack and renders
// stbtt_PackEnd()
// stbtt_GetPackedQuad()
//
// "Load" a font file from a memory buffer (you have to keep the buffer
loaded)
// stbtt_InitFont()
-// stbtt_GetFontOffsetForIndex() -- use for TTC font
collections
+// stbtt_GetFontOffsetForIndex() -- indexing for TTC font
collections
+// stbtt_GetNumberOfFonts() -- number of fonts for TTC
font collections
//
// Render a unicode codepoint to a bitmap
// stbtt_GetCodepointBitmap() -- allocates and returns a
bitmap
@@ -109,8 +123,18 @@
// Character advance/positioning
// stbtt_GetCodepointHMetrics()
// stbtt_GetFontVMetrics()
+// stbtt_GetFontVMetricsOS2()
// stbtt_GetCodepointKernAdvance()
//
+// Starting with version 1.06, the rasterizer was replaced with a new,
+// faster and generally-more-precise rasterizer. The new rasterizer more
+// accurately measures pixel coverage for anti-aliasing, except in the case
+// where multiple shapes overlap, in which case it overestimates the AA pixel
+// coverage. Thus, anti-aliasing of intersecting shapes may look wrong. If
+// this turns out to be a problem, you can re-enable the old rasterizer with
+// #define STBTT_RASTERIZER_VERSION 1
+// which will incur about a 15% speed hit.
+//
// ADDITIONAL DOCUMENTATION
//
// Immediately after this block comment are a series of sample programs.
@@ -155,7 +179,7 @@
// measurement for describing font size, defined as 72 points per inch.
// stb_truetype provides a point API for compatibility. However, true
// "per inch" conventions don't make much sense on computer displays
-// since they different monitors have different number of pixels per
+// since different monitors have different number of pixels per
// inch. For example, Windows traditionally uses a convention that
// there are 96 pixels per inch, thus making 'inch' measurements have
// nothing to do with inches, and thus effectively defining a point to
@@ -165,6 +189,39 @@
// for non-commercial fonts, thus making fonts scaled in points
// according to the TrueType spec incoherently sized in practice.
//
+// DETAILED USAGE:
+//
+// Scale:
+// Select how high you want the font to be, in points or pixels.
+// Call ScaleForPixelHeight or ScaleForMappingEmToPixels to compute
+// a scale factor SF that will be used by all other functions.
+//
+// Baseline:
+// You need to select a y-coordinate that is the baseline of where
+// your text will appear. Call GetFontBoundingBox to get the
baseline-relative
+// bounding box for all characters. SF*-y0 will be the distance in pixels
+// that the worst-case character could extend above the baseline, so if
+// you want the top edge of characters to appear at the top of the
+// screen where y=0, then you would set the baseline to SF*-y0.
+//
+// Current point:
+// Set the current point where the first character will appear. The
+// first character could extend left of the current point; this is font
+// dependent. You can either choose a current point that is the leftmost
+// point and hope, or add some padding, or check the bounding box or
+// left-side-bearing of the first character to be displayed and set
+// the current point based on that.
+//
+// Displaying a character:
+// Compute the bounding box of the character. It will contain signed values
+// relative to <current_point, baseline>. I.e. if it returns x0,y0,x1,y1,
+// then the character should be displayed in the rectangle from
+// <current_point+SF*x0, baseline+SF*y0> to
<current_point+SF*x1,baseline+SF*y1).
+//
+// Advancing for the next character:
+// Call GlyphHMetrics, and compute 'current_point += SF * advance'.
+//
+//
// ADVANCED USAGE
//
// Quality:
@@ -199,19 +256,14 @@
// recommend it.
//
//
-// SOURCE STATISTICS (based on v0.6c, 2050 LOC)
+// PERFORMANCE MEASUREMENTS FOR 1.06:
//
-// Documentation & header file 520 LOC \___ 660 LOC documentation
-// Sample code 140 LOC /
-// Truetype parsing 620 LOC ---- 620 LOC TrueType
-// Software rasterization 240 LOC \ .
-// Curve tesselation 120 LOC \__ 550 LOC Bitmap creation
-// Bitmap management 100 LOC /
-// Baked bitmap interface 70 LOC /
-// Font name matching & access 150 LOC ---- 150
-// C runtime library abstraction 60 LOC ---- 60
+// 32-bit 64-bit
+// Previous release: 8.83 s 7.68 s
+// Pool allocations: 7.72 s 6.34 s
+// Inline sort : 6.54 s 5.65 s
+// New rasterizer : 5.63 s 5.00 s
-
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
////
@@ -224,16 +276,16 @@
#define STB_TRUETYPE_IMPLEMENTATION // force following include to generate
implementation
#include "stb_truetype.h"
-char ttf_buffer[1<<20];
+unsigned char ttf_buffer[1<<20];
unsigned char temp_bitmap[512*512];
stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs
-GLstbtt_uint ftex;
+GLuint ftex;
void my_stbtt_initfont(void)
{
fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb"));
- stbtt_BakeFontBitmap(data,0, 32.0, temp_bitmap,512,512, 32,96, cdata); //
no guarantee this fits!
+ stbtt_BakeFontBitmap(ttf_buffer,0, 32.0, temp_bitmap,512,512, 32,96,
cdata); // no guarantee this fits!
// can free ttf_buffer at this point
glGenTextures(1, &ftex);
glBindTexture(GL_TEXTURE_2D, ftex);
@@ -245,6 +297,7 @@
void my_stbtt_print(float x, float y, char *text)
{
// assume orthographic projection with units = screen pixels, origin at top
left
+ glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, ftex);
glBegin(GL_QUADS);
while (*text) {
@@ -320,7 +373,7 @@
stbtt_fontinfo font;
int i,j,ascent,baseline,ch=0;
float scale, xpos=2; // leave a little padding in case the character
extends left
- char *text = "Heljo World!";
+ char *text = "Heljo World!"; // intentionally misspelled to show 'lj'
brokenness
fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb"));
stbtt_InitFont(&font, buffer, 0);
@@ -362,8 +415,11 @@
//// INTEGRATION WITH YOUR CODEBASE
////
//// The following sections allow you to supply alternate definitions
-//// of C library functions used by stb_truetype.
+//// of C library functions used by stb_truetype, e.g. if you don't
+//// link with the C runtime library.
+#include "common.h"
+
#ifdef STB_TRUETYPE_IMPLEMENTATION
// #define your own (u)stbtt_int8/16/32 before including to override this
#ifndef stbtt_uint8
@@ -378,13 +434,7 @@
typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1];
typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1];
- // #define your own STBTT_sort() to override this to avoid bu_sort
- #ifndef STBTT_sort
- #include "bu/sort.h"
- #define STBTT_sort(data,num_items,item_size,compare_func)
bu_sort(data,num_items,item_size,compare_func, NULL)
- #endif
-
- // #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
+ // 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))
@@ -394,8 +444,25 @@
#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>
@@ -414,14 +481,12 @@
#endif
#ifndef STBTT_memcpy
- #include <memory.h>
+ #include <string.h>
#define STBTT_memcpy memcpy
#define STBTT_memset memset
#endif
#endif
-#define STB_ZERO(val) (((val) > -1.0e-37) && ((val) < 1.0e-37))
-
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
////
@@ -432,10 +497,24 @@
#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
@@ -449,7 +528,7 @@
float xoff,yoff,xadvance;
} stbtt_bakedchar;
-extern int stbtt_BakeFontBitmap(const unsigned char *data, int offset, //
font location (use offset=0 for plain .ttf)
+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
@@ -465,7 +544,7 @@
float x1,y1,s1,t1; // bottom-right
} stbtt_aligned_quad;
-extern void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, //
same data as above
+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
@@ -480,6 +559,8 @@
//
// 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.
//////////////////////////////////////////////////////////////////////////////
@@ -497,24 +578,28 @@
} 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
-extern int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels,
int width, int height, int stride_in_bytes, int padding, void *alloc_context);
+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 weight x height. stride_in_bytes is
+// 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
+// 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.
-extern void stbtt_PackEnd (stbtt_pack_context *spc);
+STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc);
// Cleans up the packing context and frees all memory.
#define STBTT_POINT_SIZE(x) (-(x))
-extern int stbtt_PackFontRange(stbtt_pack_context *spc, unsigned char
*fontdata, int font_index, float font_size,
+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
@@ -532,35 +617,60 @@
typedef struct
{
float font_size;
- int first_unicode_char_in_range;
- int num_chars_in_range;
+ 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;
-extern int stbtt_PackFontRanges(stbtt_pack_context *spc, unsigned char
*fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges);
+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.
+// calls to stbtt_PackFontRange. Note that you can call this multiple
+// times within a single PackBegin/PackEnd.
-
-extern void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int
h_oversample, unsigned int v_oversample);
+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). The default (no oversampling) is achieved by
-// h_oversample=1, v_oversample=1. The total number of pixels required is
+// 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.
-extern void stbtt_GetPackedQuad(stbtt_packedchar *chardata, int pw, int ph,
// same data as above
+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 {
@@ -570,6 +680,7 @@
int height;
int stride_in_bytes;
int padding;
+ int skip_missing;
unsigned int h_oversample, v_oversample;
unsigned char *pixels;
void *nodes;
@@ -581,18 +692,23 @@
//
//
-extern int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
+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. You can just skip
-// this step if you know it's that kind of font.
+// 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.
-typedef struct stbtt_fontinfo
+struct stbtt_fontinfo
{
void * userdata;
unsigned char * data; // pointer to .ttf file
@@ -600,12 +716,19 @@
int numGlyphs; // number of glyphs, needed for range
checking
- int loca,head,glyf,hhea,hmtx,kern; // table locations as offset from start
of .ttf
+ 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_fontinfo;
-extern int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int
offset);
+ 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
@@ -617,11 +740,12 @@
//
// CHARACTER TO GLYPH-INDEX CONVERSIOn
-int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint);
+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.
//////////////////////////////////////////////////////////////////////////////
@@ -629,7 +753,7 @@
// CHARACTER PROPERTIES
//
-extern float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float
pixels);
+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
@@ -637,12 +761,12 @@
// scale = pixels / (ascent - descent)
// so if you prefer to measure height by the ascent only, use a similar
calculation.
-extern float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float
pixels);
+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.
-extern void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int
*descent, int *lineGap);
+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...
@@ -650,26 +774,44 @@
// these are expressed in unscaled coordinates, so you must multiply by
// the scale factor for a given size
-extern void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int
*y0, int *x1, int *y1);
+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
-extern void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int
codepoint, int *advanceWidth, int *leftSideBearing);
+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
-extern int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1,
int ch2);
+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
-extern int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint,
int *x0, int *y0, int *x1, int *y1);
+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
-extern void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int
glyph_index, int *advanceWidth, int *leftSideBearing);
-extern int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1,
int glyph2);
-extern int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int
*x0, int *y0, int *x1, int *y1);
+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
@@ -680,7 +822,8 @@
enum {
STBTT_vmove=1,
STBTT_vline,
- STBTT_vcurve
+ STBTT_vcurve,
+ STBTT_vcubic
};
#endif
@@ -689,16 +832,16 @@
#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;
+ stbtt_vertex_type x,y,cx,cy,cx1,cy1;
unsigned char type,padding;
} stbtt_vertex;
#endif
-extern int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index);
+STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index);
// returns non-zero if nothing is drawn for this glyph
-extern int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int
unicode_codepoint, stbtt_vertex **vertices);
-extern int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index,
stbtt_vertex **vertices);
+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
//
@@ -709,18 +852,23 @@
// draws a quadratic bezier from previous endpoint to
// its x,y, using cx,cy as the bezier control point.
-extern void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex
*vertices);
+STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex
*vertices);
// frees the data allocated above
+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
//
-extern void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata);
+STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata);
// frees the bitmap allocated below
-extern unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info,
float scale_x, float scale_y, int codepoint, int *width, int *height, int
*xoff, int *yoff);
+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).
@@ -729,21 +877,25 @@
//
// xoff/yoff are the offset it pixel space from the glyph origin to the
top-left of the bitmap
-extern 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);
+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
-extern 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);
+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.
-extern 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);
+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
-extern void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int
codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int
*iy1);
+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).
@@ -750,18 +902,19 @@
// (Note that the bitmap uses y-increases-down, but the shape uses
// y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.)
-extern 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);
+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)
-extern unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float
scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int
*yoff);
-extern 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);
-extern 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);
-extern 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);
-extern void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph,
float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
-extern 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);
+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
@@ -771,10 +924,77 @@
unsigned char *pixels;
} stbtt__bitmap;
-extern void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels,
stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float
shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata);
+// 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
@@ -795,7 +1015,7 @@
// You have to have called stbtt_InitFont() first.
-extern int stbtt_FindMatchingFont(const unsigned char *fontdata, const char
*name, int flags);
+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
@@ -806,11 +1026,11 @@
#define STBTT_MACSTYLE_UNDERSCORE 4
#define STBTT_MACSTYLE_NONE 8 // <= not same as 0, this makes us
check the bitfield is 0
-extern int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const
char *s2, int len2);
+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
-extern const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int
*length, int platformID, int encodingID, int languageID, int nameID);
+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.
//
@@ -886,10 +1106,170 @@
#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
//
@@ -900,26 +1280,15 @@
#define ttCHAR(p) (* (stbtt_int8 *) (p))
#define ttFixed(p) ttLONG(p)
-#if defined(STB_TRUETYPE_BIGENDIAN) && !defined(ALLOW_UNALIGNED_TRUETYPE)
+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 ttUSHORT(p) (* (stbtt_uint16 *) (p))
- #define ttSHORT(p) (* (stbtt_int16 *) (p))
- #define ttULONG(p) (* (stbtt_uint32 *) (p))
- #define ttLONG(p) (* (stbtt_int32 *) (p))
-
-#else
-
- stbtt_uint16 ttUSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
- stbtt_int16 ttSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
- stbtt_uint32 ttULONG(const stbtt_uint8 *p) { return (p[0]<<24) +
(p[1]<<16) + (p[2]<<8) + p[3]; }
- stbtt_int32 ttLONG(const stbtt_uint8 *p) { return (p[0]<<24) +
(p[1]<<16) + (p[2]<<8) + p[3]; }
-
-#endif
-
#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(const stbtt_uint8 *font)
+static int stbtt__isfont(stbtt_uint8 *font)
{
// check the version number
if (stbtt_tag4(font, '1',0,0,0)) return 1; // TrueType 1
@@ -926,6 +1295,7 @@
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;
}
@@ -943,7 +1313,7 @@
return 0;
}
-int stbtt_GetFontOffsetForIndex(const unsigned char *font_collection, int
index)
+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))
@@ -956,20 +1326,65 @@
stbtt_int32 n = ttLONG(font_collection+8);
if (index >= n)
return -1;
- return ttULONG(font_collection+12+index*14);
+ return ttULONG(font_collection+12+index*4);
}
}
return -1;
}
-int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data2, int
fontstart)
+static int stbtt_GetNumberOfFonts_internal(unsigned char *font_collection)
{
- stbtt_uint8 *data = (stbtt_uint8 *) data2;
+ // 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
@@ -978,9 +1393,63 @@
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
- if (!cmap || !info->loca || !info->head || !info->glyf || !info->hhea ||
!info->hmtx)
+ 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);
@@ -987,6 +1456,8 @@
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.
@@ -1019,7 +1490,7 @@
return 1;
}
-int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint)
+STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int
unicode_codepoint)
{
stbtt_uint8 *data = info->data;
stbtt_uint32 index_map = info->index_map;
@@ -1044,7 +1515,6 @@
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;
- stbtt_uint16 item, offset, start, end;
// do a binary search of the segments
stbtt_uint32 endCount = index_map + 14;
@@ -1061,8 +1531,8 @@
// now decrement to bias correctly to find smallest
search -= 2;
while (entrySelector) {
+ stbtt_uint16 end;
searchRange >>= 1;
- start = ttUSHORT(data + search + searchRange*2 + segcount*2 + 2);
end = ttUSHORT(data + search + searchRange*2);
if (unicode_codepoint > end)
search += searchRange*2;
@@ -1070,19 +1540,21 @@
}
search += 2;
- item = (stbtt_uint16) ((search - endCount) >> 1);
+ {
+ stbtt_uint16 offset, start;
+ stbtt_uint16 item = (stbtt_uint16) ((search - endCount) >> 1);
- STBTT_assert(unicode_codepoint <= ttUSHORT(data + endCount + 2*item));
- start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item);
- end = ttUSHORT(data + index_map + 14 + 2 + 2*item);
- if (unicode_codepoint < start)
- return 0;
+ STBTT_assert(unicode_codepoint <= ttUSHORT(data + endCount + 2*item));
+ start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item);
+ if (unicode_codepoint < start)
+ 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));
+ 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);
+ 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;
@@ -1111,7 +1583,7 @@
return 0;
}
-int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint,
stbtt_vertex **vertices)
+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);
}
@@ -1129,6 +1601,8 @@
{
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
@@ -1143,27 +1617,36 @@
return g1==g2 ? -1 : g1; // if length is 0, return -1
}
-int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0,
int *y0, int *x1, int *y1)
+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)
{
- int g = stbtt__GetGlyfOffset(info, glyph_index);
- if (g < 0) return 0;
+ 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);
+ 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;
}
-int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0,
int *y0, int *x1, int *y1)
+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);
}
-int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index)
+STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index)
{
stbtt_int16 numberOfContours;
- int g = stbtt__GetGlyfOffset(info, glyph_index);
+ 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;
@@ -1185,7 +1668,7 @@
return num_vertices;
}
-int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index,
stbtt_vertex **pvertices)
+static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index,
stbtt_vertex **pvertices)
{
stbtt_int16 numberOfContours;
stbtt_uint8 *endPtsOfContours;
@@ -1323,7 +1806,7 @@
}
}
num_vertices = stbtt__close_shape(vertices, num_vertices, was_off,
start_off, sx,sy,scx,scy,cx,cy);
- } else if (numberOfContours == -1) {
+ } else if (numberOfContours < 0) {
// Compound shapes.
int more = 1;
stbtt_uint8 *comp = data + g + 10;
@@ -1400,9 +1883,6 @@
// More components ?
more = flags & (1<<5);
}
- } else if (numberOfContours < 0) {
- // @TODO other compound variations?
- STBTT_assert(0);
} else {
// numberOfCounters == 0, do nothing
}
@@ -1411,8 +1891,416 @@
return num_vertices;
}
-void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int
*advanceWidth, int *leftSideBearing)
+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) stbtt__new_buf(NULL, 0);
+ 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 || b0 > 254))
+ 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);
@@ -1423,9 +2311,51 @@
}
}
-int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int
glyph2)
+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;
@@ -1453,19 +2383,270 @@
return 0;
}
-int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int
ch2)
+static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int
glyph)
{
- if (!info->kern) // if no kerning table, don't waste time looking up both
codepoint->glyphs
+ 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: {
+ // There are no other cases.
+ STBTT_assert(0);
+ } break;
+ }
+
+ 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));
+
+ classDefTable = classDef1ValueArray + 2 * glyphCount;
+ } 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);
+ }
+
+ classDefTable = classRangeRecords + 6 * classRangeCount;
+ } break;
+
+ default: {
+ // There are no other cases.
+ STBTT_assert(0);
+ } break;
+ }
+
+ return -1;
+}
+
+// Define to STBTT_assert(x) if you want to break on unimplemented formats.
+#define STBTT_GPOS_TODO_assert(x)
+
+static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info,
int glyph1, int glyph2)
+{
+ stbtt_uint16 lookupListOffset;
+ stbtt_uint8 *lookupList;
+ stbtt_uint16 lookupCount;
+ stbtt_uint8 *data;
+ stbtt_int32 i;
+
+ if (!info->gpos) return 0;
+
+ data = info->data + info->gpos;
+
+ if (ttUSHORT(data+0) != 1) return 0; // Major version 1
+ if (ttUSHORT(data+2) != 0) return 0; // Minor version 0
+
+ lookupListOffset = ttUSHORT(data+8);
+ lookupList = data + lookupListOffset;
+ lookupCount = ttUSHORT(lookupList);
+
+ for (i=0; i<lookupCount; ++i) {
+ stbtt_uint16 lookupOffset = ttUSHORT(lookupList + 2 + 2 * i);
+ stbtt_uint8 *lookupTable = lookupList + lookupOffset;
+
+ stbtt_uint16 lookupType = ttUSHORT(lookupTable);
+ stbtt_uint16 subTableCount = ttUSHORT(lookupTable + 4);
+ stbtt_uint8 *subTableOffsets = lookupTable + 6;
+ switch(lookupType) {
+ case 2: { // Pair Adjustment Positioning Subtable
+ stbtt_int32 sti;
+ for (sti=0; sti<subTableCount; sti++) {
+ stbtt_uint16 subtableOffset = ttUSHORT(subTableOffsets + 2
* sti);
+ stbtt_uint8 *table = lookupTable + subtableOffset;
+ stbtt_uint16 posFormat = ttUSHORT(table);
+ stbtt_uint16 coverageOffset = ttUSHORT(table + 2);
+ stbtt_int32 coverageIndex = stbtt__GetCoverageIndex(table
+ coverageOffset, glyph1);
+ if (coverageIndex == -1) continue;
+
+ switch (posFormat) {
+ case 1: {
+ stbtt_int32 l, r, m;
+ int straw, needle;
+ stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
+ stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
+ stbtt_int32 valueRecordPairSizeInBytes = 2;
+ stbtt_uint16 pairSetCount = ttUSHORT(table + 8);
+ stbtt_uint16 pairPosOffset = ttUSHORT(table + 10 +
2 * coverageIndex);
+ stbtt_uint8 *pairValueTable = table +
pairPosOffset;
+ stbtt_uint16 pairValueCount =
ttUSHORT(pairValueTable);
+ stbtt_uint8 *pairValueArray = pairValueTable + 2;
+ // TODO: Support more formats.
+ STBTT_GPOS_TODO_assert(valueFormat1 == 4);
+ if (valueFormat1 != 4) return 0;
+ STBTT_GPOS_TODO_assert(valueFormat2 == 0);
+ if (valueFormat2 != 0) return 0;
+
+ STBTT_assert(coverageIndex < pairSetCount);
+ STBTT__NOTUSED(pairSetCount);
+
+ needle=glyph2;
+ r=pairValueCount-1;
+ l=0;
+
+ // Binary search.
+ while (l <= r) {
+ stbtt_uint16 secondGlyph;
+ stbtt_uint8 *pairValue;
+ m = (l + r) >> 1;
+ pairValue = pairValueArray + (2 +
valueRecordPairSizeInBytes) * m;
+ secondGlyph = ttUSHORT(pairValue);
+ straw = secondGlyph;
+ if (needle < straw)
+ r = m - 1;
+ else if (needle > straw)
+ l = m + 1;
+ else {
+ stbtt_int16 xAdvance = ttSHORT(pairValue +
2);
+ return xAdvance;
+ }
+ }
+ } break;
+
+ case 2: {
+ stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
+ stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
+
+ stbtt_uint16 classDef1Offset = ttUSHORT(table + 8);
+ stbtt_uint16 classDef2Offset = ttUSHORT(table +
10);
+ int glyph1class = stbtt__GetGlyphClass(table +
classDef1Offset, glyph1);
+ int glyph2class = stbtt__GetGlyphClass(table +
classDef2Offset, glyph2);
+
+ stbtt_uint16 class1Count = ttUSHORT(table + 12);
+ stbtt_uint16 class2Count = ttUSHORT(table + 14);
+ STBTT_assert(glyph1class < class1Count);
+ STBTT_assert(glyph2class < class2Count);
+
+ // TODO: Support more formats.
+ STBTT_GPOS_TODO_assert(valueFormat1 == 4);
+ if (valueFormat1 != 4) return 0;
+ STBTT_GPOS_TODO_assert(valueFormat2 == 0);
+ if (valueFormat2 != 0) return 0;
+
+ if (glyph1class >= 0 && glyph1class < class1Count
&& glyph2class >= 0 && glyph2class < class2Count) {
+ stbtt_uint8 *class1Records = table + 16;
+ stbtt_uint8 *class2Records = class1Records + 2
* (glyph1class * class2Count);
+ stbtt_int16 xAdvance = ttSHORT(class2Records +
2 * glyph2class);
+ return xAdvance;
+ }
+ } break;
+
+ default: {
+ // There are no other cases.
+ STBTT_assert(0);
+ break;
+ };
+ }
+ }
+ break;
+ };
+
+ default:
+ // TODO: Implement other stuff.
+ break;
+ }
+ }
+
+ return 0;
+}
+
+STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int g1,
int g2)
+{
+ int xAdvance = 0;
+
+ if (info->gpos)
+ xAdvance += stbtt__GetGlyphGPOSInfoAdvance(info, g1, g2);
+ else if (info->kern)
+ xAdvance += stbtt__GetGlyphKernInfoAdvance(info, g1, g2);
+
+ return xAdvance;
+}
+
+STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int
ch1, int ch2)
+{
+ if (!info->kern && !info->gpos) // if no kerning table, don't waste time
looking up both codepoint->glyphs
return 0;
return stbtt_GetGlyphKernAdvance(info, stbtt_FindGlyphIndex(info,ch1),
stbtt_FindGlyphIndex(info,ch2));
}
-void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int
*advanceWidth, int *leftSideBearing)
+STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int
codepoint, int *advanceWidth, int *leftSideBearing)
{
stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint),
advanceWidth, leftSideBearing);
}
-void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int
*descent, int *lineGap)
+STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent,
int *descent, int *lineGap)
{
if (ascent ) *ascent = ttSHORT(info->data+info->hhea + 4);
if (descent) *descent = ttSHORT(info->data+info->hhea + 6);
@@ -1472,8 +2653,19 @@
if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8);
}
-void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0,
int *x1, int *y1)
+STBTT_DEF int stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int
*typoAscent, int *typoDescent, int *typoLineGap)
{
+ int tab = stbtt__find_table(info->data, info->fontstart, "OS/2");
+ if (!tab)
+ return 0;
+ if (typoAscent ) *typoAscent = ttSHORT(info->data+tab + 68);
+ if (typoDescent) *typoDescent = ttSHORT(info->data+tab + 70);
+ if (typoLineGap) *typoLineGap = ttSHORT(info->data+tab + 72);
+ return 1;
+}
+
+STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0,
int *y0, int *x1, int *y1)
+{
*x0 = ttSHORT(info->data + info->head + 36);
*y0 = ttSHORT(info->data + info->head + 38);
*x1 = ttSHORT(info->data + info->head + 40);
@@ -1480,31 +2672,70 @@
*y1 = ttSHORT(info->data + info->head + 42);
}
-float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float height)
+STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float
height)
{
int fheight = ttSHORT(info->data + info->hhea + 4) - ttSHORT(info->data +
info->hhea + 6);
return (float) height / fheight;
}
-float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels)
+STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info,
float pixels)
{
int unitsPerEm = ttUSHORT(info->data + info->head + 18);
return pixels / unitsPerEm;
}
-void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
+STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
{
STBTT_free(v, info->userdata);
}
+STBTT_DEF stbtt_uint8 *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl)
+{
+ int i;
+ stbtt_uint8 *data = info->data;
+ stbtt_uint8 *svg_doc_list = data + stbtt__get_svg((stbtt_fontinfo *) info);
+
+ int numEntries = ttUSHORT(svg_doc_list);
+ stbtt_uint8 *svg_docs = svg_doc_list + 2;
+
+ for(i=0; i<numEntries; i++) {
+ stbtt_uint8 *svg_doc = svg_docs + (12 * i);
+ if ((gl >= ttUSHORT(svg_doc)) && (gl <= ttUSHORT(svg_doc + 2)))
+ return svg_doc;
+ }
+ return 0;
+}
+
+STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char
**svg)
+{
+ stbtt_uint8 *data = info->data;
+ stbtt_uint8 *svg_doc;
+
+ if (info->svg == 0)
+ return 0;
+
+ svg_doc = stbtt_FindSVGDoc(info, gl);
+ if (svg_doc != NULL) {
+ *svg = (char *) data + info->svg + ttULONG(svg_doc + 4);
+ return ttULONG(svg_doc + 8);
+ } else {
+ return 0;
+ }
+}
+
+STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int
unicode_codepoint, const char **svg)
+{
+ return stbtt_GetGlyphSVG(info, stbtt_FindGlyphIndex(info,
unicode_codepoint), svg);
+}
+
//////////////////////////////////////////////////////////////////////////////
//
// antialiasing software rasterizer
//
-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)
+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)
{
- int x0,y0,x1,y1;
+ int x0=0,y0=0,x1,y1; // =0 suppresses compiler warning
if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1)) {
// e.g. space character
if (ix0) *ix0 = 0;
@@ -1520,57 +2751,146 @@
}
}
-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_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph,
float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
{
stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,0.0f,0.0f,
ix0, iy0, ix1, iy1);
}
-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)
+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)
{
stbtt_GetGlyphBitmapBoxSubpixel(font, stbtt_FindGlyphIndex(font,codepoint),
scale_x, scale_y,shift_x,shift_y, ix0,iy0,ix1,iy1);
}
-void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint,
float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
+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)
{
stbtt_GetCodepointBitmapBoxSubpixel(font, codepoint, scale_x,
scale_y,0.0f,0.0f, ix0,iy0,ix1,iy1);
}
+//////////////////////////////////////////////////////////////////////////////
+//
+// Rasterizer
+
+typedef struct stbtt__hheap_chunk
+{
+ struct stbtt__hheap_chunk *next;
+} stbtt__hheap_chunk;
+
+typedef struct stbtt__hheap
+{
+ struct stbtt__hheap_chunk *head;
+ void *first_free;
+ int num_remaining_in_head_chunk;
+} stbtt__hheap;
+
+static void *stbtt__hheap_alloc(stbtt__hheap *hh, size_t size, void *userdata)
+{
+ if (hh->first_free) {
+ void *p = hh->first_free;
+ hh->first_free = * (void **) p;
+ return p;
+ } else {
+ if (hh->num_remaining_in_head_chunk == 0) {
+ int count = (size < 32 ? 2000 : size < 128 ? 800 : 100);
+ stbtt__hheap_chunk *c = (stbtt__hheap_chunk *)
STBTT_malloc(sizeof(stbtt__hheap_chunk) + size * count, userdata);
+ if (c == NULL)
+ return NULL;
+ c->next = hh->head;
+ hh->head = c;
+ hh->num_remaining_in_head_chunk = count;
+ }
+ --hh->num_remaining_in_head_chunk;
+ return (char *) (hh->head) + sizeof(stbtt__hheap_chunk) + size *
hh->num_remaining_in_head_chunk;
+ }
+}
+
+static void stbtt__hheap_free(stbtt__hheap *hh, void *p)
+{
+ *(void **) p = hh->first_free;
+ hh->first_free = p;
+}
+
+static void stbtt__hheap_cleanup(stbtt__hheap *hh, void *userdata)
+{
+ stbtt__hheap_chunk *c = hh->head;
+ while (c) {
+ stbtt__hheap_chunk *n = c->next;
+ STBTT_free(c, userdata);
+ c = n;
+ }
+}
+
typedef struct stbtt__edge {
float x0,y0, x1,y1;
int invert;
} stbtt__edge;
+
typedef struct stbtt__active_edge
{
+ struct stbtt__active_edge *next;
+ #if STBTT_RASTERIZER_VERSION==1
int x,dx;
float ey;
- struct stbtt__active_edge *next;
- int valid;
+ int direction;
+ #elif STBTT_RASTERIZER_VERSION==2
+ float fx,fdx,fdy;
+ float direction;
+ float sy;
+ float ey;
+ #else
+ #error "Unrecognized value of STBTT_RASTERIZER_VERSION"
+ #endif
} stbtt__active_edge;
-#define FIXSHIFT 10
-#define FIX (1 << FIXSHIFT)
-#define FIXMASK (FIX-1)
+#if STBTT_RASTERIZER_VERSION == 1
+#define STBTT_FIXSHIFT 10
+#define STBTT_FIX (1 << STBTT_FIXSHIFT)
+#define STBTT_FIXMASK (STBTT_FIX-1)
-static stbtt__active_edge *new_active(stbtt__edge *e, int off_x, float
start_point, void *userdata)
+static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e,
int off_x, float start_point, void *userdata)
{
- stbtt__active_edge *z = (stbtt__active_edge *) STBTT_malloc(sizeof(*z),
userdata); // @TODO: make a pool of these!!!
+ stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh,
sizeof(*z), userdata);
float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
- STBTT_assert(e->y0 <= start_point);
+ STBTT_assert(z != NULL);
if (!z) return z;
- // round dx down to avoid going too far
+
+ // round dx down to avoid overshooting
if (dxdy < 0)
- z->dx = -STBTT_ifloor(FIX * -dxdy);
+ z->dx = -STBTT_ifloor(STBTT_FIX * -dxdy);
else
- z->dx = STBTT_ifloor(FIX * dxdy);
- z->x = STBTT_ifloor(FIX * (e->x0 + dxdy * (start_point - e->y0)));
- z->x -= off_x * FIX;
+ z->dx = STBTT_ifloor(STBTT_FIX * dxdy);
+
+ z->x = STBTT_ifloor(STBTT_FIX * e->x0 + z->dx * (start_point - e->y0)); //
use z->dx so when we offset later it's by the same amount
+ z->x -= off_x * STBTT_FIX;
+
z->ey = e->y1;
z->next = 0;
- z->valid = e->invert ? 1 : -1;
+ z->direction = e->invert ? 1 : -1;
return z;
}
+#elif STBTT_RASTERIZER_VERSION == 2
+static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e,
int off_x, float start_point, void *userdata)
+{
@@ Diff output truncated at 100000 characters. @@
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