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Nuklear/stb_truetype.h
vurtun c875e59710 added optional font handling
2015-09-15 18:13:43 +02:00

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/* stb_truetype.h - v1.07 - public domain */
/* authored from 2009-2015 by Sean Barrett / RAD Game Tools */
/* */
/* This library processes TrueType files: */
/* parse files */
/* extract glyph metrics */
/* extract glyph shapes */
/* render glyphs to one-channel bitmaps with antialiasing (box filter) */
/* */
/* Todo: */
/* non-MS cmaps */
/* crashproof on bad data */
/* hinting? (no longer patented) */
/* cleartype-style AA? */
/* optimize: use simple memory allocator for intermediates */
/* optimize: build edge-list directly from curves */
/* optimize: rasterize directly from curves? */
/* */
/* ADDITIONAL CONTRIBUTORS */
/* */
/* Mikko Mononen: compound shape support, more cmap formats */
/* Tor Andersson: kerning, subpixel rendering */
/* */
/* 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 */
/* Martins Mozeiko */
/* Cap Petschulat */
/* Omar Cornut */
/* github:aloucks */
/* Peter LaValle */
/* Giumo X. Clanjor */
/* */
/* Misc other: */
/* Ryan Gordon */
/* */
/* VERSION HISTORY */
/* */
/* 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 */
/* 1.06 (2015-07-14) performance improvements (~35% faster on x86 and x64 on test machine) */
/* also more precise AA rasterizer, except if shapes overlap */
/* remove need for STBTT_sort */
/* 1.05 (2015-04-15) fix misplaced definitions for STBTT_STATIC */
/* 1.04 (2015-04-15) typo in example */
/* 1.03 (2015-04-12) STBTT_STATIC, fix memory leak in new packing, various fixes */
/* */
/* 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, */
/* distribute, and modify this file as you see fit. */
/* */
/* USAGE */
/* */
/* Include this file in whatever places neeed to refer to it. In ONE C/C++ */
/* file, write: */
/* #define STB_TRUETYPE_IMPLEMENTATION */
/* 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 */
/* */
/* 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() -- 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 */
/* */
/* Render a unicode codepoint to a bitmap */
/* stbtt_GetCodepointBitmap() -- allocates and returns a bitmap */
/* stbtt_MakeCodepointBitmap() -- renders into bitmap you provide */
/* stbtt_GetCodepointBitmapBox() -- how big the bitmap must be */
/* */
/* Character advance/positioning */
/* stbtt_GetCodepointHMetrics() */
/* stbtt_GetFontVMetrics() */
/* 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. */
/* */
/* After the sample programs is the "header file" section. This section */
/* includes documentation for each API function. */
/* */
/* Some important concepts to understand to use this library: */
/* */
/* Codepoint */
/* Characters are defined by unicode codepoints, e.g. 65 is */
/* uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is */
/* the hiragana for "ma". */
/* */
/* Glyph */
/* A visual character shape (every codepoint is rendered as */
/* some glyph) */
/* */
/* Glyph index */
/* A font-specific integer ID representing a glyph */
/* */
/* Baseline */
/* Glyph shapes are defined relative to a baseline, which is the */
/* bottom of uppercase characters. Characters extend both above */
/* and below the baseline. */
/* */
/* Current Point */
/* As you draw text to the screen, you keep track of a "current point" */
/* which is the origin of each character. The current point's vertical */
/* position is the baseline. Even "baked fonts" use this model. */
/* */
/* Vertical Font Metrics */
/* The vertical qualities of the font, used to vertically position */
/* and space the characters. See docs for stbtt_GetFontVMetrics. */
/* */
/* Font Size in Pixels or Points */
/* The preferred interface for specifying font sizes in stb_truetype */
/* is to specify how tall the font's vertical extent should be in pixels. */
/* If that sounds good enough, skip the next paragraph. */
/* */
/* Most font APIs instead use "points", which are a common typographic */
/* 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 */
/* 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 */
/* be 1.333 pixels. Additionally, the TrueType font data provides */
/* an explicit scale factor to scale a given font's glyphs to points, */
/* but the author has observed that this scale factor is often wrong */
/* for non-commercial fonts, thus making fonts scaled in points */
/* according to the TrueType spec incoherently sized in practice. */
/* */
/* ADVANCED USAGE */
/* */
/* Quality: */
/* */
/* - Use the functions with Subpixel at the end to allow your characters */
/* to have subpixel positioning. Since the font is anti-aliased, not */
/* hinted, this is very import for quality. (This is not possible with */
/* baked fonts.) */
/* */
/* - Kerning is now supported, and if you're supporting subpixel rendering */
/* then kerning is worth using to give your text a polished look. */
/* */
/* Performance: */
/* */
/* - Convert Unicode codepoints to glyph indexes and operate on the glyphs; */
/* if you don't do this, stb_truetype is forced to do the conversion on */
/* every call. */
/* */
/* - There are a lot of memory allocations. We should modify it to take */
/* a temp buffer and allocate from the temp buffer (without freeing), */
/* should help performance a lot. */
/* */
/* NOTES */
/* */
/* The system uses the raw data found in the .ttf file without changing it */
/* and without building auxiliary data structures. This is a bit inefficient */
/* on little-endian systems (the data is big-endian), but assuming you're */
/* caching the bitmaps or glyph shapes this shouldn't be a big deal. */
/* */
/* It appears to be very hard to programmatically determine what font a */
/* given file is in a general way. I provide an API for this, but I don't */
/* recommend it. */
/* */
/* */
/* SOURCE STATISTICS (based on v0.6c, 2050 LOC) */
/* */
/* 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 */
/* */
/* */
/* PERFORMANCE MEASUREMENTS FOR 1.06: */
/* */
/* 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 */
/*//////////////////////////////////////////////////////////////////////////// */
/*//////////////////////////////////////////////////////////////////////////// */
/*// */
/*// SAMPLE PROGRAMS */
/*// */
/* */
/* Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless */
/* */
#if 0
#define STB_TRUETYPE_IMPLEMENTATION /* force following include to generate implementation */
#include "stb_truetype.h"
unsigned char ttf_buffer[1<<20];
unsigned char temp_bitmap[512*512];
stbtt_bakedchar cdata[96]; /* ASCII 32..126 is 95 glyphs */
GLuint ftex;
void my_stbtt_initfont(void)
{
fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb"));
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);
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512,512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap);
/* can free temp_bitmap at this point */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
}
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) {
if (*text >= 32 && *text < 128) {
stbtt_aligned_quad q;
stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);/*1=opengl & d3d10+,0=d3d9 */
glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y0);
glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y0);
glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y1);
glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y1);
}
++text;
}
glEnd();
}
#endif
/* */
/* */
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* Complete program (this compiles): get a single bitmap, print as ASCII art */
/* */
#if 0
#include <stdio.h>
#define STB_TRUETYPE_IMPLEMENTATION /* force following include to generate implementation */
#include "stb_truetype.h"
char ttf_buffer[1<<25];
int main(int argc, char **argv)
{
stbtt_fontinfo font;
unsigned char *bitmap;
int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20);
fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf", "rb"));
stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0));
bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0);
for (j=0; j < h; ++j) {
for (i=0; i < w; ++i)
putchar(" .:ioVM@"[bitmap[j*w+i]>>5]);
putchar('\n');
}
return 0;
}
#endif
/* */
/* Output: */
/* */
/* .ii. */
/* @@@@@@. */
/* V@Mio@@o */
/* :i. V@V */
/* :oM@@M */
/* :@@@MM@M */
/* @@o o@M */
/* :@@. M@M */
/* @@@o@@@@ */
/* :M@@V:@@. */
/* */
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* Complete program: print "Hello World!" banner, with bugs */
/* */
#if 0
char buffer[24<<20];
unsigned char screen[20][79];
int main(int arg, char **argv)
{
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!"; /* intentionally misspelled to show 'lj' brokenness */
fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb"));
stbtt_InitFont(&font, buffer, 0);
scale = stbtt_ScaleForPixelHeight(&font, 15);
stbtt_GetFontVMetrics(&font, &ascent,0,0);
baseline = (int) (ascent*scale);
while (text[ch]) {
int advance,lsb,x0,y0,x1,y1;
float x_shift = xpos - (float) floor(xpos);
stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb);
stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1);
stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]);
/* note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong */
/* because this API is really for baking character bitmaps into textures. if you want to render */
/* a sequence of characters, you really need to render each bitmap to a temp buffer, then */
/* "alpha blend" that into the working buffer */
xpos += (advance * scale);
if (text[ch+1])
xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]);
++ch;
}
for (j=0; j < 20; ++j) {
for (i=0; i < 78; ++i)
putchar(" .:ioVM@"[screen[j][i]>>5]);
putchar('\n');
}
return 0;
}
#endif
/*//////////////////////////////////////////////////////////////////////////// */
/*//////////////////////////////////////////////////////////////////////////// */
/*// */
/*// INTEGRATION WITH YOUR CODEBASE */
/*// */
/*// The following sections allow you to supply alternate definitions */
/*// of C library functions used by stb_truetype. */
#ifdef STB_TRUETYPE_IMPLEMENTATION
/* #define your own (u)stbtt_int8/16/32 before including to override this */
#ifndef stbtt_uint8
typedef unsigned char stbtt_uint8;
typedef signed char stbtt_int8;
typedef unsigned short stbtt_uint16;
typedef signed short stbtt_int16;
typedef unsigned int stbtt_uint32;
typedef signed int stbtt_int32;
#endif
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_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)
#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 <memory.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
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* 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(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. */
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* 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 weight x 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, 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, 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_GetPackedQuad(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, 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, 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;
unsigned int h_oversample, v_oversample;
unsigned char *pixels;
void *nodes;
};
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* FONT LOADING */
/* */
/* */
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. */
/* The following structure is defined publically 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; /* 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_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. */
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* 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 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 */
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* 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
};
#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;
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 countours. 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 */
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* 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_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_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;
STBTT_DEF 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);
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* 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
/*//////////////////////////////////////////////////////////////////////// */
/* */
/* 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)
#if defined(STB_TRUETYPE_BIGENDIAN) && !defined(ALLOW_UNALIGNED_TRUETYPE)
#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
static stbtt_uint16 ttUSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
static stbtt_int16 ttSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
static stbtt_uint32 ttULONG(const stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
static 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)
{
/* 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 */
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;
}
STBTT_DEF int stbtt_GetFontOffsetForIndex(const 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;
}
STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data2, int fontstart)
{
stbtt_uint8 *data = (stbtt_uint8 *) data2;
stbtt_uint32 cmap, t;
stbtt_int32 i,numTables;
info->data = data;
info->fontstart = fontstart;
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 */
if (!cmap || !info->loca || !info->head || !info->glyf || !info->hhea || !info->hmtx)
return 0;
t = stbtt__find_table(data, fontstart, "maxp");
if (t)
info->numGlyphs = ttUSHORT(data+t+4);
else
info->numGlyphs = 0xffff;
/* 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;
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);
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));
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;
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 */
}
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 (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 = 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;
}
STBTT_DEF int stbtt_GetGlyphShape(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 == -1) {
/* 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) 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 if (numberOfContours < 0) {
/* @TODO other compound variations? */
STBTT_assert(0);
} else {
/* numberOfCounters == 0, do nothing */
}
*pvertices = vertices;
return num_vertices;
}
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_GetGlyphKernAdvance(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;
}
STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2)
{
if (!info->kern) /* 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));
}
STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing)
{
stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint), advanceWidth, leftSideBearing);
}
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);
if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8);
}
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);
*y1 = ttSHORT(info->data + info->head + 42);
}
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;
}
STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels)
{
int unitsPerEm = ttUSHORT(info->data + info->head + 18);
return pixels / unitsPerEm;
}
STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
{
STBTT_free(v, info->userdata);
}
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* antialiasing software rasterizer */
/* */
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;
if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1)) {
/* e.g. space character */
if (ix0) *ix0 = 0;
if (iy0) *iy0 = 0;
if (ix1) *ix1 = 0;
if (iy1) *iy1 = 0;
} else {
/* move to integral bboxes (treating pixels as little squares, what pixels get touched)? */
if (ix0) *ix0 = STBTT_ifloor( x0 * scale_x + shift_x);
if (iy0) *iy0 = STBTT_ifloor(-y1 * scale_y + shift_y);
if (ix1) *ix1 = STBTT_iceil ( x1 * scale_x + shift_x);
if (iy1) *iy1 = STBTT_iceil (-y0 * scale_y + shift_y);
}
}
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);
}
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);
}
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) + 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;
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;
#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 *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__hheap_alloc(hh, sizeof(*z), userdata);
float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
if (!z) return z;
/* round dx down to avoid overshooting */
if (dxdy < 0)
z->dx = -STBTT_ifloor(STBTT_FIX * -dxdy);
else
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->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)
{
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); */
if (!z) return z;
z->fdx = dxdy;
z->fdy = (1/dxdy);
z->fx = e->x0 + dxdy * (start_point - e->y0);
z->fx -= off_x;
z->direction = e->invert ? 1.0f : -1.0f;
z->sy = e->y0;
z->ey = e->y1;
z->next = 0;
return z;
}
#else
#error "Unrecognized value of STBTT_RASTERIZER_VERSION"
#endif
#if STBTT_RASTERIZER_VERSION == 1
/* note: this routine clips fills that extend off the edges... ideally this */
/* wouldn't happen, but it could happen if the truetype glyph bounding boxes */
/* are wrong, or if the user supplies a too-small bitmap */
static void stbtt__fill_active_edges(unsigned char *scanline, int len, stbtt__active_edge *e, int max_weight)
{
/* non-zero winding fill */
int x0=0, w=0;
while (e) {
if (w == 0) {
/* if we're currently at zero, we need to record the edge start point */
x0 = e->x; w += e->direction;
} else {
int x1 = e->x; w += e->direction;
/* if we went to zero, we need to draw */
if (w == 0) {
int i = x0 >> STBTT_FIXSHIFT;
int j = x1 >> STBTT_FIXSHIFT;
if (i < len && j >= 0) {
if (i == j) {
/* x0,x1 are the same pixel, so compute combined coverage */
scanline[i] = scanline[i] + (stbtt_uint8) ((x1 - x0) * max_weight >> STBTT_FIXSHIFT);
} else {
if (i >= 0) /* add antialiasing for x0 */
scanline[i] = scanline[i] + (stbtt_uint8) (((STBTT_FIX - (x0 & STBTT_FIXMASK)) * max_weight) >> STBTT_FIXSHIFT);
else
i = -1; /* clip */
if (j < len) /* add antialiasing for x1 */
scanline[j] = scanline[j] + (stbtt_uint8) (((x1 & STBTT_FIXMASK) * max_weight) >> STBTT_FIXSHIFT);
else
j = len; /* clip */
for (++i; i < j; ++i) /* fill pixels between x0 and x1 */
scanline[i] = scanline[i] + (stbtt_uint8) max_weight;
}
}
}
}
e = e->next;
}
}
static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
{
stbtt__hheap hh = { 0 };
stbtt__active_edge *active = NULL;
int y,j=0;
int max_weight = (255 / vsubsample); /* weight per vertical scanline */
int s; /* vertical subsample index */
unsigned char scanline_data[512], *scanline;
if (result->w > 512)
scanline = (unsigned char *) STBTT_malloc(result->w, userdata);
else
scanline = scanline_data;
y = off_y * vsubsample;
e[n].y0 = (off_y + result->h) * (float) vsubsample + 1;
while (j < result->h) {
STBTT_memset(scanline, 0, result->w);
for (s=0; s < vsubsample; ++s) {
/* find center of pixel for this scanline */
float scan_y = y + 0.5f;
stbtt__active_edge **step = &active;
/* update all active edges; */
/* remove all active edges that terminate before the center of this scanline */
while (*step) {
stbtt__active_edge * z = *step;
if (z->ey <= scan_y) {
*step = z->next; /* delete from list */
STBTT_assert(z->direction);
z->direction = 0;
stbtt__hheap_free(&hh, z);
} else {
z->x += z->dx; /* advance to position for current scanline */
step = &((*step)->next); /* advance through list */
}
}
/* resort the list if needed */
for(;;) {
int changed=0;
step = &active;
while (*step && (*step)->next) {
if ((*step)->x > (*step)->next->x) {
stbtt__active_edge *t = *step;
stbtt__active_edge *q = t->next;
t->next = q->next;
q->next = t;
*step = q;
changed = 1;
}
step = &(*step)->next;
}
if (!changed) break;
}
/* insert all edges that start before the center of this scanline -- omit ones that also end on this scanline */
while (e->y0 <= scan_y) {
if (e->y1 > scan_y) {
stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y, userdata);
/* find insertion point */
if (active == NULL)
active = z;
else if (z->x < active->x) {
/* insert at front */
z->next = active;
active = z;
} else {
/* find thing to insert AFTER */
stbtt__active_edge *p = active;
while (p->next && p->next->x < z->x)
p = p->next;
/* at this point, p->next->x is NOT < z->x */
z->next = p->next;
p->next = z;
}
}
++e;
}
/* now process all active edges in XOR fashion */
if (active)
stbtt__fill_active_edges(scanline, result->w, active, max_weight);
++y;
}
STBTT_memcpy(result->pixels + j * result->stride, scanline, result->w);
++j;
}
stbtt__hheap_cleanup(&hh, userdata);
if (scanline != scanline_data)
STBTT_free(scanline, userdata);
}
#elif STBTT_RASTERIZER_VERSION == 2
/* the edge passed in here does not cross the vertical line at x or the vertical line at x+1 */
/* (i.e. it has already been clipped to those) */
static void stbtt__handle_clipped_edge(float *scanline, int x, stbtt__active_edge *e, float x0, float y0, float x1, float y1)
{
if (y0 == y1) return;
STBTT_assert(y0 < y1);
STBTT_assert(e->sy <= e->ey);
if (y0 > e->ey) return;
if (y1 < e->sy) return;
if (y0 < e->sy) {
x0 += (x1-x0) * (e->sy - y0) / (y1-y0);
y0 = e->sy;
}
if (y1 > e->ey) {
x1 += (x1-x0) * (e->ey - y1) / (y1-y0);
y1 = e->ey;
}
if (x0 == x)
STBTT_assert(x1 <= x+1);
else if (x0 == x+1)
STBTT_assert(x1 >= x);
else if (x0 <= x)
STBTT_assert(x1 <= x);
else if (x0 >= x+1)
STBTT_assert(x1 >= x+1);
else
STBTT_assert(x1 >= x && x1 <= x+1);
if (x0 <= x && x1 <= x)
scanline[x] += e->direction * (y1-y0);
else if (x0 >= x+1 && x1 >= x+1)
;
else {
STBTT_assert(x0 >= x && x0 <= x+1 && x1 >= x && x1 <= x+1);
scanline[x] += e->direction * (y1-y0) * (1-((x0-x)+(x1-x))/2); /* coverage = 1 - average x position */
}
}
static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill, int len, stbtt__active_edge *e, float y_top)
{
float y_bottom = y_top+1;
while (e) {
/* brute force every pixel */
/* compute intersection points with top & bottom */
STBTT_assert(e->ey >= y_top);
if (e->fdx == 0) {
float x0 = e->fx;
if (x0 < len) {
if (x0 >= 0) {
stbtt__handle_clipped_edge(scanline,(int) x0,e, x0,y_top, x0,y_bottom);
stbtt__handle_clipped_edge(scanline_fill-1,(int) x0+1,e, x0,y_top, x0,y_bottom);
} else {
stbtt__handle_clipped_edge(scanline_fill-1,0,e, x0,y_top, x0,y_bottom);
}
}
} else {
float x0 = e->fx;
float dx = e->fdx;
float xb = x0 + dx;
float x_top, x_bottom;
float y0,y1;
float dy = e->fdy;
STBTT_assert(e->sy <= y_bottom && e->ey >= y_top);
/* compute endpoints of line segment clipped to this scanline (if the */
/* line segment starts on this scanline. x0 is the intersection of the */
/* line with y_top, but that may be off the line segment. */
if (e->sy > y_top) {
x_top = x0 + dx * (e->sy - y_top);
y0 = e->sy;
} else {
x_top = x0;
y0 = y_top;
}
if (e->ey < y_bottom) {
x_bottom = x0 + dx * (e->ey - y_top);
y1 = e->ey;
} else {
x_bottom = xb;
y1 = y_bottom;
}
if (x_top >= 0 && x_bottom >= 0 && x_top < len && x_bottom < len) {
/* from here on, we don't have to range check x values */
if ((int) x_top == (int) x_bottom) {
float height;
/* simple case, only spans one pixel */
int x = (int) x_top;
height = y1 - y0;
STBTT_assert(x >= 0 && x < len);
scanline[x] += e->direction * (1-((x_top - x) + (x_bottom-x))/2) * height;
scanline_fill[x] += e->direction * height; /* everything right of this pixel is filled */
} else {
int x,x1,x2;
float y_crossing, step, sign, area;
/* covers 2+ pixels */
if (x_top > x_bottom) {
/* flip scanline vertically; signed area is the same */
float t;
y0 = y_bottom - (y0 - y_top);
y1 = y_bottom - (y1 - y_top);
t = y0, y0 = y1, y1 = t;
t = x_bottom, x_bottom = x_top, x_top = t;
dx = -dx;
dy = -dy;
t = x0, x0 = xb, xb = t;
}
x1 = (int) x_top;
x2 = (int) x_bottom;
/* compute intersection with y axis at x1+1 */
y_crossing = (x1+1 - x0) * dy + y_top;
sign = e->direction;
/* area of the rectangle covered from y0..y_crossing */
area = sign * (y_crossing-y0);
/* area of the triangle (x_top,y0), (x+1,y0), (x+1,y_crossing) */
scanline[x1] += area * (1-((x_top - x1)+(x1+1-x1))/2);
step = sign * dy;
for (x = x1+1; x < x2; ++x) {
scanline[x] += area + step/2;
area += step;
}
y_crossing += dy * (x2 - (x1+1));
STBTT_assert(fabs(area) <= 1.01f);
scanline[x2] += area + sign * (1-((x2-x2)+(x_bottom-x2))/2) * (y1-y_crossing);
scanline_fill[x2] += sign * (y1-y0);
}
} else {
/* if edge goes outside of box we're drawing, we require */
/* clipping logic. since this does not match the intended use */
/* of this library, we use a different, very slow brute */
/* force implementation */
int x;
for (x=0; x < len; ++x) {
/* cases: */
/* */
/* there can be up to two intersections with the pixel. any intersection */
/* with left or right edges can be handled by splitting into two (or three) */
/* regions. intersections with top & bottom do not necessitate case-wise logic. */
/* */
/* the old way of doing this found the intersections with the left & right edges, */
/* then used some simple logic to produce up to three segments in sorted order */
/* from top-to-bottom. however, this had a problem: if an x edge was epsilon */
/* across the x border, then the corresponding y position might not be distinct */
/* from the other y segment, and it might ignored as an empty segment. to avoid */
/* that, we need to explicitly produce segments based on x positions. */
/* rename variables to clear pairs */
float y0 = y_top;
float x1 = (float) (x);
float x2 = (float) (x+1);
float x3 = xb;
float y3 = y_bottom;
float y1,y2;
/* x = e->x + e->dx * (y-y_top) */
/* (y-y_top) = (x - e->x) / e->dx */
/* y = (x - e->x) / e->dx + y_top */
y1 = (x - x0) / dx + y_top;
y2 = (x+1 - x0) / dx + y_top;
if (x0 < x1 && x3 > x2) { /* three segments descending down-right */
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x2,y2);
stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
} else if (x3 < x1 && x0 > x2) { /* three segments descending down-left */
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x1,y1);
stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
} else if (x0 < x1 && x3 > x1) { /* two segments across x, down-right */
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
} else if (x3 < x1 && x0 > x1) { /* two segments across x, down-left */
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
} else if (x0 < x2 && x3 > x2) { /* two segments across x+1, down-right */
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
} else if (x3 < x2 && x0 > x2) { /* two segments across x+1, down-left */
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
} else { /* one segment */
stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x3,y3);
}
}
}
}
e = e->next;
}
}
/* directly AA rasterize edges w/o supersampling */
static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
{
(void)vsubsample;
stbtt__hheap hh = { 0 };
stbtt__active_edge *active = NULL;
int y,j=0, i;
float scanline_data[129], *scanline, *scanline2;
if (result->w > 64)
scanline = (float *) STBTT_malloc((result->w*2+1) * sizeof(float), userdata);
else
scanline = scanline_data;
scanline2 = scanline + result->w;
y = off_y;
e[n].y0 = (float) (off_y + result->h) + 1;
while (j < result->h) {
/* find center of pixel for this scanline */
float scan_y_top = y + 0.0f;
float scan_y_bottom = y + 1.0f;
stbtt__active_edge **step = &active;
STBTT_memset(scanline , 0, result->w*sizeof(scanline[0]));
STBTT_memset(scanline2, 0, (result->w+1)*sizeof(scanline[0]));
/* update all active edges; */
/* remove all active edges that terminate before the top of this scanline */
while (*step) {
stbtt__active_edge * z = *step;
if (z->ey <= scan_y_top) {
*step = z->next; /* delete from list */
STBTT_assert(z->direction);
z->direction = 0;
stbtt__hheap_free(&hh, z);
} else {
step = &((*step)->next); /* advance through list */
}
}
/* insert all edges that start before the bottom of this scanline */
while (e->y0 <= scan_y_bottom) {
stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y_top, userdata);
STBTT_assert(z->ey >= scan_y_top);
/* insert at front */
z->next = active;
active = z;
++e;
}
/* now process all active edges */
if (active)
stbtt__fill_active_edges_new(scanline, scanline2+1, result->w, active, scan_y_top);
{
float sum = 0;
for (i=0; i < result->w; ++i) {
float k;
int m;
sum += scanline2[i];
k = scanline[i] + sum;
k = (float) fabs(k)*255 + 0.5f;
m = (int) k;
if (m > 255) m = 255;
result->pixels[j*result->stride + i] = (unsigned char) m;
}
}
/* advance all the edges */
step = &active;
while (*step) {
stbtt__active_edge *z = *step;
z->fx += z->fdx; /* advance to position for current scanline */
step = &((*step)->next); /* advance through list */
}
++y;
++j;
}
stbtt__hheap_cleanup(&hh, userdata);
if (scanline != scanline_data)
STBTT_free(scanline, userdata);
}
#else
#error "Unrecognized value of STBTT_RASTERIZER_VERSION"
#endif
#define STBTT__COMPARE(a,b) ((a)->y0 < (b)->y0)
static void stbtt__sort_edges_ins_sort(stbtt__edge *p, int n)
{
int i,j;
for (i=1; i < n; ++i) {
stbtt__edge t = p[i], *a = &t;
j = i;
while (j > 0) {
stbtt__edge *b = &p[j-1];
int c = STBTT__COMPARE(a,b);
if (!c) break;
p[j] = p[j-1];
--j;
}
if (i != j)
p[j] = t;
}
}
static void stbtt__sort_edges_quicksort(stbtt__edge *p, int n)
{
/* threshhold for transitioning to insertion sort */
while (n > 12) {
stbtt__edge t;
int c01,c12,c,m,i,j;
/* compute median of three */
m = n >> 1;
c01 = STBTT__COMPARE(&p[0],&p[m]);
c12 = STBTT__COMPARE(&p[m],&p[n-1]);
/* if 0 >= mid >= end, or 0 < mid < end, then use mid */
if (c01 != c12) {
/* otherwise, we'll need to swap something else to middle */
int z;
c = STBTT__COMPARE(&p[0],&p[n-1]);
/* 0>mid && mid<n: 0>n => n; 0<n => 0 */
/* 0<mid && mid>n: 0>n => 0; 0<n => n */
z = (c == c12) ? 0 : n-1;
t = p[z];
p[z] = p[m];
p[m] = t;
}
/* now p[m] is the median-of-three */
/* swap it to the beginning so it won't move around */
t = p[0];
p[0] = p[m];
p[m] = t;
/* partition loop */
i=1;
j=n-1;
for(;;) {
/* handling of equality is crucial here */
/* for sentinels & efficiency with duplicates */
for (;;++i) {
if (!STBTT__COMPARE(&p[i], &p[0])) break;
}
for (;;--j) {
if (!STBTT__COMPARE(&p[0], &p[j])) break;
}
/* make sure we haven't crossed */
if (i >= j) break;
t = p[i];
p[i] = p[j];
p[j] = t;
++i;
--j;
}
/* recurse on smaller side, iterate on larger */
if (j < (n-i)) {
stbtt__sort_edges_quicksort(p,j);
p = p+i;
n = n-i;
} else {
stbtt__sort_edges_quicksort(p+i, n-i);
n = j;
}
}
}
static void stbtt__sort_edges(stbtt__edge *p, int n)
{
stbtt__sort_edges_quicksort(p, n);
stbtt__sort_edges_ins_sort(p, n);
}
typedef struct
{
float x,y;
} stbtt__point;
static void stbtt__rasterize(stbtt__bitmap *result, stbtt__point *pts, int *wcount, int windings, float scale_x, float scale_y, float shift_x, float shift_y, int off_x, int off_y, int invert, void *userdata)
{
float y_scale_inv = invert ? -scale_y : scale_y;
stbtt__edge *e;
int n,i,j,k,m;
#if STBTT_RASTERIZER_VERSION == 1
int vsubsample = result->h < 8 ? 15 : 5;
#elif STBTT_RASTERIZER_VERSION == 2
int vsubsample = 1;
#else
#error "Unrecognized value of STBTT_RASTERIZER_VERSION"
#endif
/* vsubsample should divide 255 evenly; otherwise we won't reach full opacity */
/* now we have to blow out the windings into explicit edge lists */
n = 0;
for (i=0; i < windings; ++i)
n += wcount[i];
e = (stbtt__edge *) STBTT_malloc(sizeof(*e) * (n+1), userdata); /* add an extra one as a sentinel */
if (e == 0) return;
n = 0;
m=0;
for (i=0; i < windings; ++i) {
stbtt__point *p = pts + m;
m += wcount[i];
j = wcount[i]-1;
for (k=0; k < wcount[i]; j=k++) {
int a=k,b=j;
/* skip the edge if horizontal */
if (p[j].y == p[k].y)
continue;
/* add edge from j to k to the list */
e[n].invert = 0;
if (invert ? p[j].y > p[k].y : p[j].y < p[k].y) {
e[n].invert = 1;
a=j,b=k;
}
e[n].x0 = p[a].x * scale_x + shift_x;
e[n].y0 = (p[a].y * y_scale_inv + shift_y) * vsubsample;
e[n].x1 = p[b].x * scale_x + shift_x;
e[n].y1 = (p[b].y * y_scale_inv + shift_y) * vsubsample;
++n;
}
}
/* now sort the edges by their highest point (should snap to integer, and then by x) */
/*STBTT_sort(e, n, sizeof(e[0]), stbtt__edge_compare); */
stbtt__sort_edges(e, n);
/* now, traverse the scanlines and find the intersections on each scanline, use xor winding rule */
stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y, userdata);
STBTT_free(e, userdata);
}
static void stbtt__add_point(stbtt__point *points, int n, float x, float y)
{
if (!points) return; /* during first pass, it's unallocated */
points[n].x = x;
points[n].y = y;
}
/* tesselate until threshhold p is happy... @TODO warped to compensate for non-linear stretching */
static int stbtt__tesselate_curve(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float objspace_flatness_squared, int n)
{
/* midpoint */
float mx = (x0 + 2*x1 + x2)/4;
float my = (y0 + 2*y1 + y2)/4;
/* versus directly drawn line */
float dx = (x0+x2)/2 - mx;
float dy = (y0+y2)/2 - my;
if (n > 16) /* 65536 segments on one curve better be enough! */
return 1;
if (dx*dx+dy*dy > objspace_flatness_squared) { /* half-pixel error allowed... need to be smaller if AA */
stbtt__tesselate_curve(points, num_points, x0,y0, (x0+x1)/2.0f,(y0+y1)/2.0f, mx,my, objspace_flatness_squared,n+1);
stbtt__tesselate_curve(points, num_points, mx,my, (x1+x2)/2.0f,(y1+y2)/2.0f, x2,y2, objspace_flatness_squared,n+1);
} else {
stbtt__add_point(points, *num_points,x2,y2);
*num_points = *num_points+1;
}
return 1;
}
/* returns number of contours */
static stbtt__point *stbtt_FlattenCurves(stbtt_vertex *vertices, int num_verts, float objspace_flatness, int **contour_lengths, int *num_contours, void *userdata)
{
stbtt__point *points=0;
int num_points=0;
float objspace_flatness_squared = objspace_flatness * objspace_flatness;
int i,n=0,start=0, pass;
/* count how many "moves" there are to get the contour count */
for (i=0; i < num_verts; ++i)
if (vertices[i].type == STBTT_vmove)
++n;
*num_contours = n;
if (n == 0) return 0;
*contour_lengths = (int *) STBTT_malloc(sizeof(**contour_lengths) * n, userdata);
if (*contour_lengths == 0) {
*num_contours = 0;
return 0;
}
/* make two passes through the points so we don't need to realloc */
for (pass=0; pass < 2; ++pass) {
float x=0,y=0;
if (pass == 1) {
points = (stbtt__point *) STBTT_malloc(num_points * sizeof(points[0]), userdata);
if (points == NULL) goto error;
}
num_points = 0;
n= -1;
for (i=0; i < num_verts; ++i) {
switch (vertices[i].type) {
case STBTT_vmove:
/* start the next contour */
if (n >= 0)
(*contour_lengths)[n] = num_points - start;
++n;
start = num_points;
x = vertices[i].x, y = vertices[i].y;
stbtt__add_point(points, num_points++, x,y);
break;
case STBTT_vline:
x = vertices[i].x, y = vertices[i].y;
stbtt__add_point(points, num_points++, x, y);
break;
case STBTT_vcurve:
stbtt__tesselate_curve(points, &num_points, x,y,
vertices[i].cx, vertices[i].cy,
vertices[i].x, vertices[i].y,
objspace_flatness_squared, 0);
x = vertices[i].x, y = vertices[i].y;
break;
}
}
(*contour_lengths)[n] = num_points - start;
}
return points;
error:
STBTT_free(points, userdata);
STBTT_free(*contour_lengths, userdata);
*contour_lengths = 0;
*num_contours = 0;
return NULL;
}
STBTT_DEF 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)
{
float scale = scale_x > scale_y ? scale_y : scale_x;
int winding_count, *winding_lengths;
stbtt__point *windings = stbtt_FlattenCurves(vertices, num_verts, flatness_in_pixels / scale, &winding_lengths, &winding_count, userdata);
if (windings) {
stbtt__rasterize(result, windings, winding_lengths, winding_count, scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert, userdata);
STBTT_free(winding_lengths, userdata);
STBTT_free(windings, userdata);
}
}
STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata)
{
STBTT_free(bitmap, userdata);
}
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)
{
int ix0,iy0,ix1,iy1;
stbtt__bitmap gbm;
stbtt_vertex *vertices;
int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
if (scale_x == 0) scale_x = scale_y;
if (scale_y == 0) {
if (scale_x == 0) return NULL;
scale_y = scale_x;
}
stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,&ix1,&iy1);
/* now we get the size */
gbm.w = (ix1 - ix0);
gbm.h = (iy1 - iy0);
gbm.pixels = NULL; /* in case we error */
if (width ) *width = gbm.w;
if (height) *height = gbm.h;
if (xoff ) *xoff = ix0;
if (yoff ) *yoff = iy0;
if (gbm.w && gbm.h) {
gbm.pixels = (unsigned char *) STBTT_malloc(gbm.w * gbm.h, info->userdata);
if (gbm.pixels) {
gbm.stride = gbm.w;
stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0, iy0, 1, info->userdata);
}
}
STBTT_free(vertices, info->userdata);
return gbm.pixels;
}
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)
{
return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y, 0.0f, 0.0f, glyph, width, height, xoff, yoff);
}
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)
{
int ix0,iy0;
stbtt_vertex *vertices;
int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
stbtt__bitmap gbm;
stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,0,0);
gbm.pixels = output;
gbm.w = out_w;
gbm.h = out_h;
gbm.stride = out_stride;
if (gbm.w && gbm.h)
stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0,iy0, 1, info->userdata);
STBTT_free(vertices, info->userdata);
}
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_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, glyph);
}
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)
{
return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y,shift_x,shift_y, stbtt_FindGlyphIndex(info,codepoint), width,height,xoff,yoff);
}
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)
{
stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, stbtt_FindGlyphIndex(info,codepoint));
}
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)
{
return stbtt_GetCodepointBitmapSubpixel(info, scale_x, scale_y, 0.0f,0.0f, codepoint, width,height,xoff,yoff);
}
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)
{
stbtt_MakeCodepointBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, codepoint);
}
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* bitmap baking */
/* */
/* This is SUPER-CRAPPY packing to keep source code small */
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)
{
float scale;
int x,y,bottom_y, i;
stbtt_fontinfo f;
if (!stbtt_InitFont(&f, data, offset))
return -1;
STBTT_memset(pixels, 0, pw*ph); /* background of 0 around pixels */
x=y=1;
bottom_y = 1;
scale = stbtt_ScaleForPixelHeight(&f, pixel_height);
for (i=0; i < num_chars; ++i) {
int advance, lsb, x0,y0,x1,y1,gw,gh;
int g = stbtt_FindGlyphIndex(&f, first_char + i);
stbtt_GetGlyphHMetrics(&f, g, &advance, &lsb);
stbtt_GetGlyphBitmapBox(&f, g, scale,scale, &x0,&y0,&x1,&y1);
gw = x1-x0;
gh = y1-y0;
if (x + gw + 1 >= pw)
y = bottom_y, x = 1; /* advance to next row */
if (y + gh + 1 >= ph) /* check if it fits vertically AFTER potentially moving to next row */
return -i;
STBTT_assert(x+gw < pw);
STBTT_assert(y+gh < ph);
stbtt_MakeGlyphBitmap(&f, pixels+x+y*pw, gw,gh,pw, scale,scale, g);
chardata[i].x0 = (stbtt_int16) x;
chardata[i].y0 = (stbtt_int16) y;
chardata[i].x1 = (stbtt_int16) (x + gw);
chardata[i].y1 = (stbtt_int16) (y + gh);
chardata[i].xadvance = scale * advance;
chardata[i].xoff = (float) x0;
chardata[i].yoff = (float) y0;
x = x + gw + 1;
if (y+gh+1 > bottom_y)
bottom_y = y+gh+1;
}
return bottom_y;
}
STBTT_DEF void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule)
{
float d3d_bias = opengl_fillrule ? 0 : -0.5f;
float ipw = 1.0f / pw, iph = 1.0f / ph;
stbtt_bakedchar *b = chardata + char_index;
int round_x = STBTT_ifloor((*xpos + b->xoff) + 0.5f);
int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5f);
q->x0 = round_x + d3d_bias;
q->y0 = round_y + d3d_bias;
q->x1 = round_x + b->x1 - b->x0 + d3d_bias;
q->y1 = round_y + b->y1 - b->y0 + d3d_bias;
q->s0 = b->x0 * ipw;
q->t0 = b->y0 * iph;
q->s1 = b->x1 * ipw;
q->t1 = b->y1 * iph;
*xpos += b->xadvance;
}
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* rectangle packing replacement routines if you don't have stb_rect_pack.h */
/* */
#ifndef STB_RECT_PACK_VERSION
#ifdef _MSC_VER
#define STBTT__NOTUSED(v) (void)(v)
#else
#define STBTT__NOTUSED(v) (void)sizeof(v)
#endif
typedef int stbrp_coord;
/*////////////////////////////////////////////////////////////////////////////////// */
/* // */
/* // */
/* COMPILER WARNING ?!?!? // */
/* // */
/* // */
/* if you get a compile warning due to these symbols being defined more than // */
/* once, move #include "stb_rect_pack.h" before #include "stb_truetype.h" // */
/* // */
/*////////////////////////////////////////////////////////////////////////////////// */
typedef struct
{
int width,height;
int x,y,bottom_y;
} stbrp_context;
typedef struct
{
unsigned char x;
} stbrp_node;
struct stbrp_rect
{
stbrp_coord x,y;
int id,w,h,was_packed;
};
static void stbrp_init_target(stbrp_context *con, int pw, int ph, stbrp_node *nodes, int num_nodes)
{
con->width = pw;
con->height = ph;
con->x = 0;
con->y = 0;
con->bottom_y = 0;
STBTT__NOTUSED(nodes);
STBTT__NOTUSED(num_nodes);
}
static void stbrp_pack_rects(stbrp_context *con, stbrp_rect *rects, int num_rects)
{
int i;
for (i=0; i < num_rects; ++i) {
if (con->x + rects[i].w > con->width) {
con->x = 0;
con->y = con->bottom_y;
}
if (con->y + rects[i].h > con->height)
break;
rects[i].x = con->x;
rects[i].y = con->y;
rects[i].was_packed = 1;
con->x += rects[i].w;
if (con->y + rects[i].h > con->bottom_y)
con->bottom_y = con->y + rects[i].h;
}
for ( ; i < num_rects; ++i)
rects[i].was_packed = 0;
}
#endif
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* bitmap baking */
/* */
/* This is SUPER-AWESOME (tm Ryan Gordon) packing using stb_rect_pack.h. If */
/* stb_rect_pack.h isn't available, it uses the BakeFontBitmap strategy. */
STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int pw, int ph, int stride_in_bytes, int padding, void *alloc_context)
{
stbrp_context *context = (stbrp_context *) STBTT_malloc(sizeof(*context) ,alloc_context);
int num_nodes = pw - padding;
stbrp_node *nodes = (stbrp_node *) STBTT_malloc(sizeof(*nodes ) * num_nodes,alloc_context);
if (context == NULL || nodes == NULL) {
if (context != NULL) STBTT_free(context, alloc_context);
if (nodes != NULL) STBTT_free(nodes , alloc_context);
return 0;
}
spc->user_allocator_context = alloc_context;
spc->width = pw;
spc->height = ph;
spc->pixels = pixels;
spc->pack_info = context;
spc->nodes = nodes;
spc->padding = padding;
spc->stride_in_bytes = stride_in_bytes != 0 ? stride_in_bytes : pw;
spc->h_oversample = 1;
spc->v_oversample = 1;
stbrp_init_target(context, pw-padding, ph-padding, nodes, num_nodes);
if (pixels)
STBTT_memset(pixels, 0, pw*ph); /* background of 0 around pixels */
return 1;
}
STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc)
{
STBTT_free(spc->nodes , spc->user_allocator_context);
STBTT_free(spc->pack_info, spc->user_allocator_context);
}
STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample)
{
STBTT_assert(h_oversample <= STBTT_MAX_OVERSAMPLE);
STBTT_assert(v_oversample <= STBTT_MAX_OVERSAMPLE);
if (h_oversample <= STBTT_MAX_OVERSAMPLE)
spc->h_oversample = h_oversample;
if (v_oversample <= STBTT_MAX_OVERSAMPLE)
spc->v_oversample = v_oversample;
}
#define STBTT__OVER_MASK (STBTT_MAX_OVERSAMPLE-1)
static void stbtt__h_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
{
unsigned char buffer[STBTT_MAX_OVERSAMPLE];
int safe_w = w - kernel_width;
int j;
for (j=0; j < h; ++j) {
int i;
unsigned int total;
STBTT_memset(buffer, 0, kernel_width);
total = 0;
/* make kernel_width a constant in common cases so compiler can optimize out the divide */
switch (kernel_width) {
case 2:
for (i=0; i <= safe_w; ++i) {
total += pixels[i] - buffer[i & STBTT__OVER_MASK];
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
pixels[i] = (unsigned char) (total / 2);
}
break;
case 3:
for (i=0; i <= safe_w; ++i) {
total += pixels[i] - buffer[i & STBTT__OVER_MASK];
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
pixels[i] = (unsigned char) (total / 3);
}
break;
case 4:
for (i=0; i <= safe_w; ++i) {
total += pixels[i] - buffer[i & STBTT__OVER_MASK];
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
pixels[i] = (unsigned char) (total / 4);
}
break;
case 5:
for (i=0; i <= safe_w; ++i) {
total += pixels[i] - buffer[i & STBTT__OVER_MASK];
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
pixels[i] = (unsigned char) (total / 5);
}
break;
default:
for (i=0; i <= safe_w; ++i) {
total += pixels[i] - buffer[i & STBTT__OVER_MASK];
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
pixels[i] = (unsigned char) (total / kernel_width);
}
break;
}
for (; i < w; ++i) {
STBTT_assert(pixels[i] == 0);
total -= buffer[i & STBTT__OVER_MASK];
pixels[i] = (unsigned char) (total / kernel_width);
}
pixels += stride_in_bytes;
}
}
static void stbtt__v_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
{
unsigned char buffer[STBTT_MAX_OVERSAMPLE];
int safe_h = h - kernel_width;
int j;
for (j=0; j < w; ++j) {
int i;
unsigned int total;
STBTT_memset(buffer, 0, kernel_width);
total = 0;
/* make kernel_width a constant in common cases so compiler can optimize out the divide */
switch (kernel_width) {
case 2:
for (i=0; i <= safe_h; ++i) {
total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
pixels[i*stride_in_bytes] = (unsigned char) (total / 2);
}
break;
case 3:
for (i=0; i <= safe_h; ++i) {
total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
pixels[i*stride_in_bytes] = (unsigned char) (total / 3);
}
break;
case 4:
for (i=0; i <= safe_h; ++i) {
total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
pixels[i*stride_in_bytes] = (unsigned char) (total / 4);
}
break;
case 5:
for (i=0; i <= safe_h; ++i) {
total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
pixels[i*stride_in_bytes] = (unsigned char) (total / 5);
}
break;
default:
for (i=0; i <= safe_h; ++i) {
total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width);
}
break;
}
for (; i < h; ++i) {
STBTT_assert(pixels[i*stride_in_bytes] == 0);
total -= buffer[i & STBTT__OVER_MASK];
pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width);
}
pixels += 1;
}
}
static float stbtt__oversample_shift(int oversample)
{
if (!oversample)
return 0.0f;
/* The prefilter is a box filter of width "oversample", */
/* which shifts phase by (oversample - 1)/2 pixels in */
/* oversampled space. We want to shift in the opposite */
/* direction to counter this. */
return (float)-(oversample - 1) / (2.0f * (float)oversample);
}
/* rects array must be big enough to accommodate all characters in the given ranges */
STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
{
int i,j,k;
k=0;
for (i=0; i < num_ranges; ++i) {
float fh = ranges[i].font_size;
float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh);
ranges[i].h_oversample = (unsigned char) spc->h_oversample;
ranges[i].v_oversample = (unsigned char) spc->v_oversample;
for (j=0; j < ranges[i].num_chars; ++j) {
int x0,y0,x1,y1;
int codepoint = ranges[i].first_unicode_codepoint_in_range ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
int glyph = stbtt_FindGlyphIndex(info, codepoint);
stbtt_GetGlyphBitmapBoxSubpixel(info,glyph,
scale * spc->h_oversample,
scale * spc->v_oversample,
0,0,
&x0,&y0,&x1,&y1);
rects[k].w = (stbrp_coord) (x1-x0 + spc->padding + spc->h_oversample-1);
rects[k].h = (stbrp_coord) (y1-y0 + spc->padding + spc->v_oversample-1);
++k;
}
}
return k;
}
/* rects array must be big enough to accommodate all characters in the given ranges */
STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
{
int i,j,k, return_value = 1;
/* save current values */
int old_h_over = spc->h_oversample;
int old_v_over = spc->v_oversample;
k = 0;
for (i=0; i < num_ranges; ++i) {
float fh = ranges[i].font_size;
float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh);
float recip_h,recip_v,sub_x,sub_y;
spc->h_oversample = ranges[i].h_oversample;
spc->v_oversample = ranges[i].v_oversample;
recip_h = 1.0f / spc->h_oversample;
recip_v = 1.0f / spc->v_oversample;
sub_x = stbtt__oversample_shift(spc->h_oversample);
sub_y = stbtt__oversample_shift(spc->v_oversample);
for (j=0; j < ranges[i].num_chars; ++j) {
stbrp_rect *r = &rects[k];
if (r->was_packed) {
stbtt_packedchar *bc = &ranges[i].chardata_for_range[j];
int advance, lsb, x0,y0,x1,y1;
int codepoint = ranges[i].first_unicode_codepoint_in_range ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
int glyph = stbtt_FindGlyphIndex(info, codepoint);
stbrp_coord pad = (stbrp_coord) spc->padding;
/* pad on left and top */
r->x += pad;
r->y += pad;
r->w -= pad;
r->h -= pad;
stbtt_GetGlyphHMetrics(info, glyph, &advance, &lsb);
stbtt_GetGlyphBitmapBox(info, glyph,
scale * spc->h_oversample,
scale * spc->v_oversample,
&x0,&y0,&x1,&y1);
stbtt_MakeGlyphBitmapSubpixel(info,
spc->pixels + r->x + r->y*spc->stride_in_bytes,
r->w - spc->h_oversample+1,
r->h - spc->v_oversample+1,
spc->stride_in_bytes,
scale * spc->h_oversample,
scale * spc->v_oversample,
0,0,
glyph);
if (spc->h_oversample > 1)
stbtt__h_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
r->w, r->h, spc->stride_in_bytes,
spc->h_oversample);
if (spc->v_oversample > 1)
stbtt__v_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
r->w, r->h, spc->stride_in_bytes,
spc->v_oversample);
bc->x0 = (stbtt_int16) r->x;
bc->y0 = (stbtt_int16) r->y;
bc->x1 = (stbtt_int16) (r->x + r->w);
bc->y1 = (stbtt_int16) (r->y + r->h);
bc->xadvance = scale * advance;
bc->xoff = (float) x0 * recip_h + sub_x;
bc->yoff = (float) y0 * recip_v + sub_y;
bc->xoff2 = (x0 + r->w) * recip_h + sub_x;
bc->yoff2 = (y0 + r->h) * recip_v + sub_y;
} else {
return_value = 0; /* if any fail, report failure */
}
++k;
}
}
/* restore original values */
spc->h_oversample = old_h_over;
spc->v_oversample = old_v_over;
return return_value;
}
STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects)
{
stbrp_pack_rects((stbrp_context *) spc->pack_info, rects, num_rects);
}
STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges)
{
stbtt_fontinfo info;
int i,j,n, return_value = 1;
/*stbrp_context *context = (stbrp_context *) spc->pack_info; */
stbrp_rect *rects;
/* flag all characters as NOT packed */
for (i=0; i < num_ranges; ++i)
for (j=0; j < ranges[i].num_chars; ++j)
ranges[i].chardata_for_range[j].x0 =
ranges[i].chardata_for_range[j].y0 =
ranges[i].chardata_for_range[j].x1 =
ranges[i].chardata_for_range[j].y1 = 0;
n = 0;
for (i=0; i < num_ranges; ++i)
n += ranges[i].num_chars;
rects = (stbrp_rect *) STBTT_malloc(sizeof(*rects) * n, spc->user_allocator_context);
if (rects == NULL)
return 0;
stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata,font_index));
n = stbtt_PackFontRangesGatherRects(spc, &info, ranges, num_ranges, rects);
stbtt_PackFontRangesPackRects(spc, rects, n);
return_value = stbtt_PackFontRangesRenderIntoRects(spc, &info, ranges, num_ranges, rects);
STBTT_free(rects, spc->user_allocator_context);
return return_value;
}
STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, unsigned char *fontdata, int font_index, float font_size,
int first_unicode_codepoint_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range)
{
stbtt_pack_range range;
range.first_unicode_codepoint_in_range = first_unicode_codepoint_in_range;
range.array_of_unicode_codepoints = NULL;
range.num_chars = num_chars_in_range;
range.chardata_for_range = chardata_for_range;
range.font_size = font_size;
return stbtt_PackFontRanges(spc, fontdata, font_index, &range, 1);
}
STBTT_DEF void stbtt_GetPackedQuad(stbtt_packedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int align_to_integer)
{
float ipw = 1.0f / pw, iph = 1.0f / ph;
stbtt_packedchar *b = chardata + char_index;
if (align_to_integer) {
float x = (float) STBTT_ifloor((*xpos + b->xoff) + 0.5f);
float y = (float) STBTT_ifloor((*ypos + b->yoff) + 0.5f);
q->x0 = x;
q->y0 = y;
q->x1 = x + b->xoff2 - b->xoff;
q->y1 = y + b->yoff2 - b->yoff;
} else {
q->x0 = *xpos + b->xoff;
q->y0 = *ypos + b->yoff;
q->x1 = *xpos + b->xoff2;
q->y1 = *ypos + b->yoff2;
}
q->s0 = b->x0 * ipw;
q->t0 = b->y0 * iph;
q->s1 = b->x1 * ipw;
q->t1 = b->y1 * iph;
*xpos += b->xadvance;
}
/*//////////////////////////////////////////////////////////////////////////// */
/* */
/* font name matching -- recommended not to use this */
/* */
/* check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string */
static stbtt_int32 stbtt__CompareUTF8toUTF16_bigendian_prefix(const stbtt_uint8 *s1, stbtt_int32 len1, const stbtt_uint8 *s2, stbtt_int32 len2)
{
stbtt_int32 i=0;
/* convert utf16 to utf8 and compare the results while converting */
while (len2) {
stbtt_uint16 ch = s2[0]*256 + s2[1];
if (ch < 0x80) {
if (i >= len1) return -1;
if (s1[i++] != ch) return -1;
} else if (ch < 0x800) {
if (i+1 >= len1) return -1;
if (s1[i++] != 0xc0 + (ch >> 6)) return -1;
if (s1[i++] != 0x80 + (ch & 0x3f)) return -1;
} else if (ch >= 0xd800 && ch < 0xdc00) {
stbtt_uint32 c;
stbtt_uint16 ch2 = s2[2]*256 + s2[3];
if (i+3 >= len1) return -1;
c = ((ch - 0xd800) << 10) + (ch2 - 0xdc00) + 0x10000;
if (s1[i++] != 0xf0 + (c >> 18)) return -1;
if (s1[i++] != 0x80 + ((c >> 12) & 0x3f)) return -1;
if (s1[i++] != 0x80 + ((c >> 6) & 0x3f)) return -1;
if (s1[i++] != 0x80 + ((c ) & 0x3f)) return -1;
s2 += 2; /* plus another 2 below */
len2 -= 2;
} else if (ch >= 0xdc00 && ch < 0xe000) {
return -1;
} else {
if (i+2 >= len1) return -1;
if (s1[i++] != 0xe0 + (ch >> 12)) return -1;
if (s1[i++] != 0x80 + ((ch >> 6) & 0x3f)) return -1;
if (s1[i++] != 0x80 + ((ch ) & 0x3f)) return -1;
}
s2 += 2;
len2 -= 2;
}
return i;
}
STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2)
{
return len1 == stbtt__CompareUTF8toUTF16_bigendian_prefix((const stbtt_uint8*) s1, len1, (const stbtt_uint8*) s2, len2);
}
/* returns results in whatever encoding you request... but note that 2-byte encodings */
/* will be BIG-ENDIAN... use stbtt_CompareUTF8toUTF16_bigendian() to compare */
STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID)
{
stbtt_int32 i,count,stringOffset;
stbtt_uint8 *fc = font->data;
stbtt_uint32 offset = font->fontstart;
stbtt_uint32 nm = stbtt__find_table(fc, offset, "name");
if (!nm) return NULL;
count = ttUSHORT(fc+nm+2);
stringOffset = nm + ttUSHORT(fc+nm+4);
for (i=0; i < count; ++i) {
stbtt_uint32 loc = nm + 6 + 12 * i;
if (platformID == ttUSHORT(fc+loc+0) && encodingID == ttUSHORT(fc+loc+2)
&& languageID == ttUSHORT(fc+loc+4) && nameID == ttUSHORT(fc+loc+6)) {
*length = ttUSHORT(fc+loc+8);
return (const char *) (fc+stringOffset+ttUSHORT(fc+loc+10));
}
}
return NULL;
}
static int stbtt__matchpair(stbtt_uint8 *fc, stbtt_uint32 nm, stbtt_uint8 *name, stbtt_int32 nlen, stbtt_int32 target_id, stbtt_int32 next_id)
{
stbtt_int32 i;
stbtt_int32 count = ttUSHORT(fc+nm+2);
stbtt_int32 stringOffset = nm + ttUSHORT(fc+nm+4);
for (i=0; i < count; ++i) {
stbtt_uint32 loc = nm + 6 + 12 * i;
stbtt_int32 id = ttUSHORT(fc+loc+6);
if (id == target_id) {
/* find the encoding */
stbtt_int32 platform = ttUSHORT(fc+loc+0), encoding = ttUSHORT(fc+loc+2), language = ttUSHORT(fc+loc+4);
/* is this a Unicode encoding? */
if (platform == 0 || (platform == 3 && encoding == 1) || (platform == 3 && encoding == 10)) {
stbtt_int32 slen = ttUSHORT(fc+loc+8);
stbtt_int32 off = ttUSHORT(fc+loc+10);
/* check if there's a prefix match */
stbtt_int32 matchlen = stbtt__CompareUTF8toUTF16_bigendian_prefix(name, nlen, fc+stringOffset+off,slen);
if (matchlen >= 0) {
/* check for target_id+1 immediately following, with same encoding & language */
if (i+1 < count && ttUSHORT(fc+loc+12+6) == next_id && ttUSHORT(fc+loc+12) == platform && ttUSHORT(fc+loc+12+2) == encoding && ttUSHORT(fc+loc+12+4) == language) {
slen = ttUSHORT(fc+loc+12+8);
off = ttUSHORT(fc+loc+12+10);
if (slen == 0) {
if (matchlen == nlen)
return 1;
} else if (matchlen < nlen && name[matchlen] == ' ') {
++matchlen;
if (stbtt_CompareUTF8toUTF16_bigendian((char*) (name+matchlen), nlen-matchlen, (char*)(fc+stringOffset+off),slen))
return 1;
}
} else {
/* if nothing immediately following */
if (matchlen == nlen)
return 1;
}
}
}
/* @TODO handle other encodings */
}
}
return 0;
}
static int stbtt__matches(stbtt_uint8 *fc, stbtt_uint32 offset, stbtt_uint8 *name, stbtt_int32 flags)
{
stbtt_int32 nlen = (stbtt_int32) STBTT_strlen((char *) name);
stbtt_uint32 nm,hd;
if (!stbtt__isfont(fc+offset)) return 0;
/* check italics/bold/underline flags in macStyle... */
if (flags) {
hd = stbtt__find_table(fc, offset, "head");
if ((ttUSHORT(fc+hd+44) & 7) != (flags & 7)) return 0;
}
nm = stbtt__find_table(fc, offset, "name");
if (!nm) return 0;
if (flags) {
/* if we checked the macStyle flags, then just check the family and ignore the subfamily */
if (stbtt__matchpair(fc, nm, name, nlen, 16, -1)) return 1;
if (stbtt__matchpair(fc, nm, name, nlen, 1, -1)) return 1;
if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1;
} else {
if (stbtt__matchpair(fc, nm, name, nlen, 16, 17)) return 1;
if (stbtt__matchpair(fc, nm, name, nlen, 1, 2)) return 1;
if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1;
}
return 0;
}
STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *font_collection, const char *name_utf8, stbtt_int32 flags)
{
stbtt_int32 i;
for (i=0;;++i) {
stbtt_int32 off = stbtt_GetFontOffsetForIndex(font_collection, i);
if (off < 0) return off;
if (stbtt__matches((stbtt_uint8 *) font_collection, off, (stbtt_uint8*) name_utf8, flags))
return off;
}
}
#endif /* STB_TRUETYPE_IMPLEMENTATION */
/* FULL VERSION HISTORY */
/* */
/* 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints; */
/* allow 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 */
/* 1.06 (2015-07-14) performance improvements (~35% faster on x86 and x64 on test machine) */
/* also more precise AA rasterizer, except if shapes overlap */
/* remove need for STBTT_sort */
/* 1.05 (2015-04-15) fix misplaced definitions for STBTT_STATIC */
/* 1.04 (2015-04-15) typo in example */
/* 1.03 (2015-04-12) STBTT_STATIC, fix memory leak in new packing, various fixes */
/* 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 */
/* */
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