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posix-uefi/examples/0B_vecfont/ssfn.h

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/*
* ssfn.h
* https://gitlab.com/bztsrc/scalable-font2
*
* Copyright (C) 2020 bzt (bztsrc@gitlab)
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* @brief Scalable Screen Font renderers
*
*/
#ifndef _SSFN_H_
#define _SSFN_H_
#define SSFN_VERSION 0x0200
#ifdef __cplusplus
extern "C" {
# ifndef __THROW
# define __THROW throw()
# endif
#else
# ifndef __THROW
# define __THROW
# endif
#endif
/* if stdint.h was not included before us */
#ifndef _STDINT_H
typedef unsigned char uint8_t;
typedef unsigned short int uint16_t;
typedef short int int16_t;
typedef unsigned int uint32_t;
#ifndef _UINT64_T
typedef unsigned long int uint64_t;
#endif
#endif
/***** file format *****/
/* magic bytes */
#define SSFN_MAGIC "SFN2"
#define SSFN_COLLECTION "SFNC"
#define SSFN_ENDMAGIC "2NFS"
/* ligatures area */
#define SSFN_LIG_FIRST 0xF000
#define SSFN_LIG_LAST 0xF8FF
/* font family group in font type byte */
#define SSFN_TYPE_FAMILY(x) ((x)&15)
#define SSFN_FAMILY_SERIF 0
#define SSFN_FAMILY_SANS 1
#define SSFN_FAMILY_DECOR 2
#define SSFN_FAMILY_MONOSPACE 3
#define SSFN_FAMILY_HAND 4
/* font style flags in font type byte */
#define SSFN_TYPE_STYLE(x) (((x)>>4)&15)
#define SSFN_STYLE_REGULAR 0
#define SSFN_STYLE_BOLD 1
#define SSFN_STYLE_ITALIC 2
#define SSFN_STYLE_USRDEF1 4 /* user defined variant 1 */
#define SSFN_STYLE_USRDEF2 8 /* user defined variant 2 */
/* contour commands */
#define SSFN_CONTOUR_MOVE 0
#define SSFN_CONTOUR_LINE 1
#define SSFN_CONTOUR_QUAD 2
#define SSFN_CONTOUR_CUBIC 3
/* glyph fragments, kerning groups and hinting grid info */
#define SSFN_FRAG_CONTOUR 0
#define SSFN_FRAG_BITMAP 1
#define SSFN_FRAG_PIXMAP 2
#define SSFN_FRAG_KERNING 3
#define SSFN_FRAG_HINTING 4
/* main SSFN header, 32 bytes */
typedef struct {
uint8_t magic[4]; /* SSFN magic bytes */
uint32_t size; /* total size in bytes */
uint8_t type; /* font family and style */
uint8_t features; /* format features and revision */
uint8_t width; /* overall width of the font */
uint8_t height; /* overall height of the font */
uint8_t baseline; /* horizontal baseline in grid pixels */
uint8_t underline; /* position of under line in grid pixels */
uint16_t fragments_offs; /* offset of fragments table */
uint32_t characters_offs; /* characters table offset */
uint32_t ligature_offs; /* ligatures table offset */
uint32_t kerning_offs; /* kerning table offset */
uint32_t cmap_offs; /* color map offset */
} __attribute__((packed)) ssfn_font_t;
/***** renderer API *****/
#define SSFN_FAMILY_ANY 0xff /* select the first loaded font */
#define SSFN_FAMILY_BYNAME 0xfe /* select font by its unique name */
/* additional styles not stored in fonts */
#define SSFN_STYLE_UNDERLINE 16 /* under line glyph */
#define SSFN_STYLE_STHROUGH 32 /* strike through glyph */
#define SSFN_STYLE_NOAA 64 /* no anti-aliasing */
#define SSFN_STYLE_NOKERN 128 /* no kerning */
#define SSFN_STYLE_NODEFGLYPH 256 /* don't draw default glyph */
#define SSFN_STYLE_NOCACHE 512 /* don't cache rasterized glyph */
#define SSFN_STYLE_NOHINTING 1024 /* no auto hinting grid (not used as of now) */
#define SSFN_STYLE_RTL 2048 /* render right-to-left */
#define SSFN_STYLE_ABS_SIZE 4096 /* scale absoulte height */
/* error codes */
#define SSFN_OK 0 /* success */
#define SSFN_ERR_ALLOC -1 /* allocation error */
#define SSFN_ERR_BADFILE -2 /* bad SSFN file format */
#define SSFN_ERR_NOFACE -3 /* no font face selected */
#define SSFN_ERR_INVINP -4 /* invalid input */
#define SSFN_ERR_BADSTYLE -5 /* bad style */
#define SSFN_ERR_BADSIZE -6 /* bad size */
#define SSFN_ERR_NOGLYPH -7 /* glyph (or kerning info) not found */
#define SSFN_SIZE_MAX 192 /* biggest size we can render */
#define SSFN_ITALIC_DIV 4 /* italic angle divisor, glyph top side pushed width / this pixels */
#define SSFN_PREC 4 /* precision in bits */
/* destination frame buffer context */
typedef struct {
uint8_t *ptr; /* pointer to the buffer */
int16_t w; /* width (positive: ARGB, negative: ABGR pixels) */
int16_t h; /* height */
uint16_t p; /* pitch, bytes per line */
int16_t x; /* cursor x */
int16_t y; /* cursor y */
uint32_t fg; /* foreground color */
uint32_t bg; /* background color */
} ssfn_buf_t;
/* cached bitmap struct */
#define SSFN_DATA_MAX ((SSFN_SIZE_MAX + 4 + (SSFN_SIZE_MAX + 4) / SSFN_ITALIC_DIV) << 8)
typedef struct {
uint16_t p; /* data buffer pitch, bytes per line */
uint8_t h; /* data buffer height */
uint8_t o; /* overlap of glyph, scaled to size */
uint8_t x; /* advance x, scaled to size */
uint8_t y; /* advance y, scaled to size */
uint8_t a; /* ascender, scaled to size */
uint8_t d; /* descender, scaled to size */
uint8_t data[SSFN_DATA_MAX]; /* data buffer */
} ssfn_glyph_t;
/* character metrics */
typedef struct {
uint8_t t; /* type and overlap */
uint8_t n; /* number of fragments */
uint8_t w; /* width */
uint8_t h; /* height */
uint8_t x; /* advance x */
uint8_t y; /* advance y */
} ssfn_chr_t;
#ifdef SSFN_PROFILING
#include <string.h>
#include <sys/time.h>
#endif
/* renderer context */
typedef struct {
#ifdef SSFN_MAXLINES
const ssfn_font_t *fnt[5][16]; /* static font registry */
#else
const ssfn_font_t **fnt[5]; /* dynamic font registry */
#endif
const ssfn_font_t *s; /* explicitly selected font */
const ssfn_font_t *f; /* font selected by best match */
ssfn_glyph_t ga; /* glyph sketch area */
ssfn_glyph_t *g; /* current glyph pointer */
#ifdef SSFN_MAXLINES
uint16_t p[SSFN_MAXLINES*2];
#else
ssfn_glyph_t ***c[17]; /* glyph cache */
uint16_t *p;
char **bufs; /* allocated extra buffers */
#endif
ssfn_chr_t *rc; /* pointer to current character */
int numbuf, lenbuf, np, ap, ox, oy, ax;
int mx, my, lx, ly; /* move to coordinates, last coordinates */
int len[5]; /* number of fonts in registry */
int family; /* required family */
int style; /* required style */
int size; /* required size */
int line; /* calculate line height */
#ifdef SSFN_PROFILING
uint64_t lookup, raster, blit, kern;/* profiling accumulators */
#endif
} ssfn_t;
/***** API function protoypes *****/
uint32_t ssfn_utf8(char **str); /* decode UTF-8 sequence */
/* normal renderer */
int ssfn_load(ssfn_t *ctx, const void *data); /* add an SSFN to context */
int ssfn_select(ssfn_t *ctx, int family, const char *name, int style, int size); /* select font to use */
int ssfn_render(ssfn_t *ctx, ssfn_buf_t *dst, const char *str); /* render a glyph to a pixel buffer */
int ssfn_bbox(ssfn_t *ctx, const char *str, int *w, int *h, int *left, int *top); /* get bounding box */
ssfn_buf_t *ssfn_text(ssfn_t *ctx, const char *str, unsigned int fg); /* renders text to a newly allocated buffer */
int ssfn_mem(ssfn_t *ctx); /* return how much memory is used */
void ssfn_free(ssfn_t *ctx); /* free context */
#define ssfn_error(err) (err<0&&err>=-7?ssfn_errstr[-err]:"Unknown error") /* return string for error code */
extern const char *ssfn_errstr[];
/* simple renderer */
extern ssfn_font_t *ssfn_src; /* font buffer */
extern ssfn_buf_t ssfn_dst; /* destination frame buffer */
int ssfn_putc(uint32_t unicode); /* render console bitmap font */
/***** renderer implementations *****/
/*** these go for both renderers ***/
#if (defined(SSFN_IMPLEMENTATION) || defined(SSFN_CONSOLEBITMAP_PALETTE) || \
defined(SSFN_CONSOLEBITMAP_HICOLOR) || defined(SSFN_CONSOLEBITMAP_TRUECOLOR)) && !defined(SSFN_COMMON)
#define SSFN_COMMON
/**
* Error code strings
*/
const char *ssfn_errstr[] = { "",
"Memory allocation error",
"Bad file format",
"No font face found",
"Invalid input value",
"Invalid style",
"Invalid size",
"Glyph not found"
};
/**
* Decode an UTF-8 multibyte, advance string pointer and return UNICODE. Watch out, no input checks
*
* @param **s pointer to an UTF-8 string pointer
* @return unicode, and *s moved to next multibyte sequence
*/
uint32_t ssfn_utf8(char **s)
{
uint32_t c = **s;
if((**s & 128) != 0) {
if(!(**s & 32)) { c = ((**s & 0x1F)<<6)|(*(*s+1) & 0x3F); *s += 1; } else
if(!(**s & 16)) { c = ((**s & 0xF)<<12)|((*(*s+1) & 0x3F)<<6)|(*(*s+2) & 0x3F); *s += 2; } else
if(!(**s & 8)) { c = ((**s & 0x7)<<18)|((*(*s+1) & 0x3F)<<12)|((*(*s+2) & 0x3F)<<6)|(*(*s+3) & 0x3F); *s += 3; }
else c = 0;
}
(*s)++;
return c;
}
#endif
#ifdef SSFN_IMPLEMENTATION
/*** normal renderer (ca. 28k, fully featured with error checking) ***/
# ifndef NULL
# define NULL (void*)0
# endif
# ifndef size_t
typedef __SIZE_TYPE__ size_t;
# endif
# ifndef inline
# define inline __inline__
# endif
#ifndef _STRING_H_
extern int memcmp (const void *__s1, const void *__s2, size_t __n) __THROW;
extern void *memset (void *__s, int __c, size_t __n) __THROW;
#endif
/* Clang does not have built-ins */
# ifndef SSFN_memcmp
# ifdef __builtin_memcmp
# define SSFN_memcmp __builtin_memcmp
# else
# ifndef SSFN_MAXLINES
# define SSFN_memcmp memcmp
# else
static int SSFN_memcmp(const void *__s1, const void *__s2, size_t __n)
{ unsigned char *a = (unsigned char *)__s1, *b = (unsigned char *)__s2;
if(__n > 0) { while(__n-- > 0) { if(*a != *b) { return *a - *b; } a++; b++; } } return 0; }
# endif
# endif
# endif
# ifndef SSFN_memset
# ifdef __builtin_memset
# define SSFN_memset __builtin_memset
# else
# ifndef SSFN_MAXLINES
# define SSFN_memset memset
# else
static void *SSFN_memset(void *__s, int __c, size_t __n)
{ unsigned char *a = __s; if(__n > 0) { while(__n-- > 0) *a++ = __c; } return __s; }
# endif
# endif
# endif
# ifndef SSFN_MAXLINES
# ifndef SSFN_realloc
# ifdef __builtin_realloc
# define SSFN_realloc __builtin_realloc
# else
# define SSFN_realloc realloc
extern void *realloc (void *__ptr, size_t __size) __THROW;
# endif
# endif
# ifndef SSFN_free
# ifdef __builtin_free
# define SSFN_free __builtin_free
# else
# define SSFN_free free
extern void free (void *p) __THROW;
# endif
# endif
# endif /* if !SSFN_MAXLINES */
/*** Private functions ***/
/* parse character table */
static uint8_t *_ssfn_c(const ssfn_font_t *font, const char *str, int *len, uint32_t *unicode)
{
uint32_t i, j, u = -1U;
uint16_t *l;
uint8_t *ptr, *s;
*len = 0; *unicode = 0;
if(!font || !font->characters_offs || !str || !*str) return NULL;
if(font->ligature_offs) {
for(l = (uint16_t*)((uint8_t*)font + font->ligature_offs), i = 0; l[i] && u == -1U; i++) {
for(ptr = (uint8_t*)font + l[i], s = (uint8_t*)str; *ptr && *ptr == *s; ptr++, s++);
if(!*ptr) { u = SSFN_LIG_FIRST + i; *len = (int)(s - (uint8_t*)str); break; }
}
}
if(u == -1U) {
s = (uint8_t*)str;
u = ssfn_utf8((char**)&s);
*len = (int)(s - (uint8_t*)str);
}
*unicode = u;
for(ptr = (uint8_t*)font + font->characters_offs, i = 0; i < 0x110000; i++) {
if(ptr[0] == 0xFF) { i += 65535; ptr++; }
else if((ptr[0] & 0xC0) == 0xC0) { j = (((ptr[0] & 0x3F) << 8) | ptr[1]); i += j; ptr += 2; }
else if((ptr[0] & 0xC0) == 0x80) { j = (ptr[0] & 0x3F); i += j; ptr++; }
else {
if(i == u) return ptr;
ptr += 6 + ptr[1] * (ptr[0] & 0x40 ? 6 : 5);
}
}
return NULL;
}
/* add a line to contour */
static void _ssfn_l(ssfn_t *ctx, int p, int h, int x, int y)
{
if(x < 0 || y < 0 || x >= p || y >= h || (
((ctx->lx + (1 << (SSFN_PREC-1))) >> SSFN_PREC) == ((x + (1 << (SSFN_PREC-1))) >> SSFN_PREC) &&
((ctx->ly + (1 << (SSFN_PREC-1))) >> SSFN_PREC) == ((y + (1 << (SSFN_PREC-1))) >> SSFN_PREC))) return;
#ifdef SSFN_MAXLINES
if(ctx->np >= SSFN_MAXLINES*2-2) return;
#else
if(ctx->ap <= ctx->np) {
ctx->ap = ctx->np + 512;
ctx->p = (uint16_t*)SSFN_realloc(ctx->p, ctx->ap * sizeof(uint16_t));
if(!ctx->p) { ctx->ap = ctx->np = 0; return; }
}
#endif
if(!ctx->np) {
ctx->p[0] = ctx->mx;
ctx->p[1] = ctx->my;
ctx->np += 2;
}
ctx->p[ctx->np+0] = x;
ctx->p[ctx->np+1] = y;
ctx->np += 2;
ctx->lx = x; ctx->ly = y;
}
/* add a Bezier curve to contour */
static void _ssfn_b(ssfn_t *ctx, int p,int h, int x0,int y0, int x1,int y1, int x2,int y2, int x3,int y3, int l)
{
int m0x, m0y, m1x, m1y, m2x, m2y, m3x, m3y, m4x, m4y,m5x, m5y;
if(l<4 && (x0!=x3 || y0!=y3)) {
m0x = ((x1-x0)/2) + x0; m0y = ((y1-y0)/2) + y0;
m1x = ((x2-x1)/2) + x1; m1y = ((y2-y1)/2) + y1;
m2x = ((x3-x2)/2) + x2; m2y = ((y3-y2)/2) + y2;
m3x = ((m1x-m0x)/2) + m0x; m3y = ((m1y-m0y)/2) + m0y;
m4x = ((m2x-m1x)/2) + m1x; m4y = ((m2y-m1y)/2) + m1y;
m5x = ((m4x-m3x)/2) + m3x; m5y = ((m4y-m3y)/2) + m3y;
_ssfn_b(ctx, p,h, x0,y0, m0x,m0y, m3x,m3y, m5x,m5y, l+1);
_ssfn_b(ctx, p,h, m5x,m5y, m4x,m4y, m2x,m2y, x3,y3, l+1);
}
if(l) _ssfn_l(ctx, p,h, x3, y3);
}
#ifndef SSFN_MAXLINES
static void _ssfn_fc(ssfn_t *ctx)
{
int i, j, k;
if(!ctx) return;
for(k = 0; k <= 16; k++)
if(ctx->c[k]) {
for(j = 0; j < 256; j++)
if(ctx->c[k][j]) {
for(i = 0; i < 256; i++)
if(ctx->c[k][j][i]) SSFN_free(ctx->c[k][j][i]);
SSFN_free(ctx->c[k][j]);
}
SSFN_free(ctx->c[k]);
ctx->c[k] = NULL;
}
}
/*
* gzip deflate uncompressor from stb_image.h with minor modifications to reduce dependency
* stb_image - v2.23 - public domain image loader - http://nothings.org/stb_image.h
*/
#define SSFN__ZFAST_BITS 9
#define SSFN__ZFAST_MASK ((1 << SSFN__ZFAST_BITS) - 1)
typedef struct
{
uint16_t fast[1 << SSFN__ZFAST_BITS];
uint16_t firstcode[16];
int maxcode[17];
uint16_t firstsymbol[16];
unsigned char size[288];
uint16_t value[288];
} _ssfn__zhuffman;
inline static int _ssfn__bitreverse16(int n)
{
n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1);
n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2);
n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4);
n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8);
return n;
}
inline static int _ssfn__bit_reverse(int v, int bits)
{
return _ssfn__bitreverse16(v) >> (16-bits);
}
static int _ssfn__zbuild_huffman(_ssfn__zhuffman *z, unsigned char *sizelist, int num)
{
int i,k=0;
int code, next_code[16], sizes[17];
SSFN_memset(sizes, 0, sizeof(sizes));
SSFN_memset(z->fast, 0, sizeof(z->fast));
for (i=0; i < num; ++i)
++sizes[sizelist[i]];
sizes[0] = 0;
for (i=1; i < 16; ++i)
if (sizes[i] > (1 << i))
return 0;
code = 0;
for (i=1; i < 16; ++i) {
next_code[i] = code;
z->firstcode[i] = (uint16_t) code;
z->firstsymbol[i] = (uint16_t) k;
code = (code + sizes[i]);
if (sizes[i])
if (code-1 >= (1 << i)) return 0;
z->maxcode[i] = code << (16-i);
code <<= 1;
k += sizes[i];
}
z->maxcode[16] = 0x10000;
for (i=0; i < num; ++i) {
int s = sizelist[i];
if (s) {
int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
uint16_t fastv = (uint16_t) ((s << 9) | i);
z->size [c] = (unsigned char) s;
z->value[c] = (uint16_t) i;
if (s <= SSFN__ZFAST_BITS) {
int j = _ssfn__bit_reverse(next_code[s],s);
while (j < (1 << SSFN__ZFAST_BITS)) {
z->fast[j] = fastv;
j += (1 << s);
}
}
++next_code[s];
}
}
return 1;
}
typedef struct
{
unsigned char *zbuffer;
int num_bits;
uint32_t code_buffer;
char *zout;
char *zout_start;
char *zout_end;
_ssfn__zhuffman z_length, z_distance;
} _ssfn__zbuf;
inline static unsigned char _ssfn__zget8(_ssfn__zbuf *z)
{
return *z->zbuffer++;
}
static void _ssfn__fill_bits(_ssfn__zbuf *z)
{
do {
z->code_buffer |= (unsigned int) _ssfn__zget8(z) << z->num_bits;
z->num_bits += 8;
} while (z->num_bits <= 24);
}
inline static unsigned int _ssfn__zreceive(_ssfn__zbuf *z, int n)
{
unsigned int k;
if (z->num_bits < n) _ssfn__fill_bits(z);
k = z->code_buffer & ((1 << n) - 1);
z->code_buffer >>= n;
z->num_bits -= n;
return k;
}
static int _ssfn__zhuffman_decode_slowpath(_ssfn__zbuf *a, _ssfn__zhuffman *z)
{
int b,s,k;
k = _ssfn__bit_reverse(a->code_buffer, 16);
for (s=SSFN__ZFAST_BITS+1; ; ++s)
if (k < z->maxcode[s])
break;
if (s == 16) return -1;
b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s];
a->code_buffer >>= s;
a->num_bits -= s;
return z->value[b];
}
inline static int _ssfn__zhuffman_decode(_ssfn__zbuf *a, _ssfn__zhuffman *z)
{
int b,s;
if (a->num_bits < 16) _ssfn__fill_bits(a);
b = z->fast[a->code_buffer & SSFN__ZFAST_MASK];
if (b) {
s = b >> 9;
a->code_buffer >>= s;
a->num_bits -= s;
return b & 511;
}
return _ssfn__zhuffman_decode_slowpath(a, z);
}
static int _ssfn__zexpand(_ssfn__zbuf *z, char *zout)
{
char *q;
int cur, limit;
z->zout = zout;
cur = (int) (z->zout - z->zout_start);
limit = (int) (z->zout_end - z->zout_start);
if(limit == 8) {
if(z->zout_start[0] != 'S' || z->zout_start[1] != 'F' || z->zout_start[2] != 'N') return 0;
limit = *((uint32_t*)&z->zout_start[4]);
} else return 0;
q = (char *) SSFN_realloc(z->zout_start, limit);
if (q == NULL) return 0;
z->zout_start = q;
z->zout = q + cur;
z->zout_end = q + limit;
return 1;
}
static int _ssfn__zlength_base[31] = {
3,4,5,6,7,8,9,10,11,13,
15,17,19,23,27,31,35,43,51,59,
67,83,99,115,131,163,195,227,258,0,0 };
static int _ssfn__zlength_extra[31]=
{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 };
static int _ssfn__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,
257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0};
static int _ssfn__zdist_extra[32] =
{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
static int _ssfn__parse_huffman_block(_ssfn__zbuf *a)
{
char *zout = a->zout;
for(;;) {
int z = _ssfn__zhuffman_decode(a, &a->z_length);
if (z < 256) {
if (z < 0) return 0;
if (zout >= a->zout_end) {
if (!_ssfn__zexpand(a, zout)) return 0;
zout = a->zout;
}
*zout++ = (char) z;
} else {
unsigned char *p;
int len,dist;
if (z == 256) {
a->zout = zout;
return 1;
}
z -= 257;
len = _ssfn__zlength_base[z];
if (_ssfn__zlength_extra[z]) len += _ssfn__zreceive(a, _ssfn__zlength_extra[z]);
z = _ssfn__zhuffman_decode(a, &a->z_distance);
if (z < 0) return 0;
dist = _ssfn__zdist_base[z];
if (_ssfn__zdist_extra[z]) dist += _ssfn__zreceive(a, _ssfn__zdist_extra[z]);
if (zout - a->zout_start < dist) return 0;
if (zout + len > a->zout_end) {
if (!_ssfn__zexpand(a, zout)) return 0;
zout = a->zout;
}
p = (unsigned char *) (zout - dist);
if (dist == 1) {
unsigned char v = *p;
if (len) { do *zout++ = v; while (--len); }
} else {
if (len) { do *zout++ = *p++; while (--len); }
}
}
}
}
static int _ssfn__compute_huffman_codes(_ssfn__zbuf *a)
{
static unsigned char length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
_ssfn__zhuffman z_codelength;
unsigned char lencodes[286+32+137];
unsigned char codelength_sizes[19];
int i,n;
int hlit = _ssfn__zreceive(a,5) + 257;
int hdist = _ssfn__zreceive(a,5) + 1;
int hclen = _ssfn__zreceive(a,4) + 4;
int ntot = hlit + hdist;
SSFN_memset(codelength_sizes, 0, sizeof(codelength_sizes));
for (i=0; i < hclen; ++i) {
int s = _ssfn__zreceive(a,3);
codelength_sizes[length_dezigzag[i]] = (unsigned char) s;
}
if (!_ssfn__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0;
n = 0;
while (n < ntot) {
int c = _ssfn__zhuffman_decode(a, &z_codelength);
if (c < 0 || c >= 19) return 0;
if (c < 16)
lencodes[n++] = (unsigned char) c;
else {
unsigned char fill = 0;
if (c == 16) {
c = _ssfn__zreceive(a,2)+3;
if (n == 0) return 0;
fill = lencodes[n-1];
} else if (c == 17)
c = _ssfn__zreceive(a,3)+3;
else {
c = _ssfn__zreceive(a,7)+11;
}
if (ntot - n < c) return 0;
SSFN_memset(lencodes+n, fill, c);
n += c;
}
}
if (n != ntot) return 0;
if (!_ssfn__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0;
if (!_ssfn__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0;
return 1;
}
inline static int _ssfn__parse_uncompressed_block(_ssfn__zbuf *a)
{
unsigned char header[4];
int len,nlen,k;
if (a->num_bits & 7)
_ssfn__zreceive(a, a->num_bits & 7);
k = 0;
while (a->num_bits > 0) {
header[k++] = (unsigned char) (a->code_buffer & 255);
a->code_buffer >>= 8;
a->num_bits -= 8;
}
while (k < 4)
header[k++] = _ssfn__zget8(a);
len = header[1] * 256 + header[0];
nlen = header[3] * 256 + header[2];
if (nlen != (len ^ 0xffff)) return 0;
if (a->zout + len > a->zout_end)
if (!_ssfn__zexpand(a, a->zout)) return 0;
for(k = 0; k < len; k++)
a->zout[k] = a->zbuffer[k];
a->zbuffer += len;
a->zout += len;
return 1;
}
static unsigned char _ssfn__zdefault_length[288], _ssfn__zdefault_distance[32];
static void _ssfn__init_zdefaults(void)
{
int i;
for (i=0; i <= 143; ++i) _ssfn__zdefault_length[i] = 8;
for ( ; i <= 255; ++i) _ssfn__zdefault_length[i] = 9;
for ( ; i <= 279; ++i) _ssfn__zdefault_length[i] = 7;
for ( ; i <= 287; ++i) _ssfn__zdefault_length[i] = 8;
for (i=0; i <= 31; ++i) _ssfn__zdefault_distance[i] = 5;
}
static int _ssfn__parse_zlib(_ssfn__zbuf *a)
{
int fin, type;
a->num_bits = 0;
a->code_buffer = 0;
do {
fin = _ssfn__zreceive(a,1);
type = _ssfn__zreceive(a,2);
if (type == 0) {
if (!_ssfn__parse_uncompressed_block(a)) return 0;
} else if (type == 3) {
return 0;
} else {
if (type == 1) {
if (!_ssfn__zbuild_huffman(&a->z_length , _ssfn__zdefault_length , 288)) return 0;
if (!_ssfn__zbuild_huffman(&a->z_distance, _ssfn__zdefault_distance, 32)) return 0;
} else {
if (!_ssfn__compute_huffman_codes(a)) return 0;
}
if (!_ssfn__parse_huffman_block(a)) return 0;
}
} while (!fin);
return 1;
}
char *_ssfn_zlib_decode(const char *buffer)
{
_ssfn__zbuf a;
char *p = (char *) SSFN_realloc(NULL, 8);
if (p == NULL) return NULL;
a.zbuffer = (unsigned char *) buffer;
a.zout_start = p;
a.zout = p;
a.zout_end = p + 8;
_ssfn__init_zdefaults();
if (_ssfn__parse_zlib(&a)) {
return a.zout_start;
} else {
SSFN_free(a.zout_start);
return NULL;
}
}
#endif /* if !SSFN_MAXLINES */
/*** Public API implementation ***/
/**
* Load a font or font collection into renderer context
*
* @param ctx rendering context
* @param font SSFN font or font collection in memory
* @return error code
*/
int ssfn_load(ssfn_t *ctx, const void *data)
{
const ssfn_font_t *font = (const ssfn_font_t *)data;
ssfn_font_t *fnt, *end;
int family;
#ifndef SSFN_MAXLINES
uint8_t c, r, *ptr = (uint8_t *)font;
#endif
if(!ctx || !font)
return SSFN_ERR_INVINP;
if(((uint8_t *)font)[0] == 0x1f && ((uint8_t *)font)[1] == 0x8b) {
#ifdef SSFN_MAXLINES
return SSFN_ERR_BADFILE;
#else
ptr += 2;
if(*ptr++ != 8) return SSFN_ERR_BADFILE;
c = *ptr++; ptr += 6;
if(c & 4) { r = *ptr++; r += (*ptr++ << 8); ptr += r; }
if(c & 8) { while(*ptr++ != 0); }
if(c & 16) { while(*ptr++ != 0); }
font = (ssfn_font_t*)_ssfn_zlib_decode((const char*)ptr);
if(!font) return SSFN_ERR_BADFILE;
ctx->bufs = (char**)SSFN_realloc(ctx->bufs, (ctx->numbuf + 1) * sizeof(char*));
if(!ctx->bufs) { ctx->numbuf = 0; return SSFN_ERR_ALLOC; }
ctx->bufs[ctx->numbuf++] = (char*)font;
ctx->lenbuf += font->size;
#endif
}
if(!SSFN_memcmp(font->magic, SSFN_COLLECTION, 4)) {
end = (ssfn_font_t*)((uint8_t*)font + font->size);
for(fnt = (ssfn_font_t*)((uint8_t*)font + 8); fnt < end && !ssfn_load(ctx, (const void *)fnt);
fnt = (ssfn_font_t*)((uint8_t*)fnt + fnt->size));
} else {
family = SSFN_TYPE_FAMILY(font->type);
if(SSFN_memcmp(font->magic, SSFN_MAGIC, 4) || SSFN_memcmp((uint8_t*)font + font->size - 4, SSFN_ENDMAGIC, 4) ||
family > SSFN_FAMILY_HAND || font->fragments_offs >= font->size || font->characters_offs >= font->size ||
font->ligature_offs >= font->size || font->kerning_offs >= font->size || font->cmap_offs >= font->size ||
font->fragments_offs >= font->characters_offs) {
return SSFN_ERR_BADFILE;
} else {
ctx->len[family]++;
#ifdef SSFN_MAXLINES
if(ctx->len[family] > 15) return SSFN_ERR_ALLOC;
#else
ctx->fnt[family] = (const ssfn_font_t**)SSFN_realloc(ctx->fnt[family], ctx->len[family]*sizeof(void*));
if(!ctx->fnt[family]) {
ctx->len[family] = 0;
return SSFN_ERR_ALLOC;
} else
#endif
ctx->fnt[family][ctx->len[family]-1] = font;
}
#ifndef SSFN_MAXLINES
_ssfn_fc(ctx);
#endif
}
return SSFN_OK;
}
/**
* Free renderer context
*
* @param ctx rendering context
*/
void ssfn_free(ssfn_t *ctx)
{
#ifndef SSFN_MAXLINES
int i;
#endif
if(!ctx) return;
#ifndef SSFN_MAXLINES
_ssfn_fc(ctx);
if(ctx->bufs) {
for(i = 0; i < ctx->numbuf; i++)
if(ctx->bufs[i]) SSFN_free(ctx->bufs[i]);
SSFN_free(ctx->bufs);
}
for(i = 0; i < 5; i++)
if(ctx->fnt[i]) SSFN_free(ctx->fnt[i]);
if(ctx->p) SSFN_free(ctx->p);
#endif
SSFN_memset(ctx, 0, sizeof(ssfn_t));
}
/**
* Returns how much memory a context consumes
*
* @param ctx rendering context
* @return total memory used by that context in bytes
*/
int ssfn_mem(ssfn_t *ctx)
{
#ifdef SSFN_MAXLINES
return ctx ? sizeof(ssfn_t) : 0;
#else
int i, j, k, ret = sizeof(ssfn_t);
if(!ctx) return 0;
for(i = 0; i < 5; i++) ret += ctx->len[i] * sizeof(ssfn_font_t*);
ret += ctx->lenbuf;
for(k = 0; k <= 16; k++) {
if(ctx->c[k]) {
for(j = 0; j < 256; j++)
if(ctx->c[k][j]) {
for(i = 0; i < 256; i++)
if(ctx->c[k][j][i]) ret += 8 + ctx->c[k][j][i]->p * ctx->c[k][j][i]->h;
ret += 256 * sizeof(void*);
}
ret += 256 * sizeof(void*);
}
}
if(ctx->p) ret += ctx->ap * sizeof(uint16_t);
return ret;
#endif
}
/**
* Set up rendering parameters
*
* @param ctx rendering context
* @param family one of SSFN_FAMILY_*
* @param name NULL or UTF-8 string if family is SSFN_FAMILY_BYNAME
* @param style OR'd values of SSFN_STYLE_*
* @param size how big glyph it should render, 8 - 192
* @return error code
*/
int ssfn_select(ssfn_t *ctx, int family, const char *name, int style, int size)
{
int i, j, l;
if(!ctx) return SSFN_ERR_INVINP;
#ifndef SSFN_MAXLINES
_ssfn_fc(ctx);
#endif
if((style & ~0x1FFF)) return SSFN_ERR_BADSTYLE;
if(size < 8 || size > SSFN_SIZE_MAX) return SSFN_ERR_BADSIZE;
if(family == SSFN_FAMILY_BYNAME) {
if(!name || !name[0]) return SSFN_ERR_INVINP;
for(l=0; name[l]; l++);
for(i=0; i < 5; i++) {
for(j=0; j < ctx->len[i]; j++) {
if(!SSFN_memcmp(name, (uint8_t*)&ctx->fnt[i][j]->magic + sizeof(ssfn_font_t), l)) {
ctx->s = ctx->fnt[i][j];
goto familyfound;
}
}
}
return SSFN_ERR_NOFACE;
} else {
if(family != SSFN_FAMILY_ANY && (family > SSFN_FAMILY_HAND || !ctx->len[family])) return SSFN_ERR_NOFACE;
ctx->s = NULL;
}
familyfound:
ctx->f = NULL;
ctx->family = family;
ctx->style = style;
ctx->size = size;
ctx->line = 0;
return SSFN_OK;
}
/**
* Render a glyph to a pixel buffer
*
* @param ctx rendering context
* @param dst destination buffer
* @param str pointer to an UTF-8 string
* @return number of bytes parsed in str (zero means end of string) or error code
*/
int ssfn_render(ssfn_t *ctx, ssfn_buf_t *dst, const char *str)
{
ssfn_font_t **fl;
uint8_t *ptr = NULL, *frg, *end, *tmp, color, ci = 0, cb = 0, cs, dec[65536];
uint16_t r[640];
uint32_t unicode, P, O, *Op, *Ol;
unsigned long int sR, sG, sB, sA;
int ret = 0, i, j, k, l, p, m, n, o, s, x, y, w, h, a, A, b, B, nr, uix, uax;
int ox, oy, y0, y1, Y0, Y1, x0, x1, X0, X1, X2, xs, ys, yp, pc, fB, fG, fR, fA, bB, bG, bR, dB, dG, dR, dA;
#ifdef SSFN_PROFILING
struct timeval tv0, tv1, tvd;
gettimeofday(&tv0, NULL);
#endif
if(!ctx || !str) return SSFN_ERR_INVINP;
if(!*str) return 0;
if(*str == '\r') { dst->x = 0; return 1; }
if(*str == '\n') { dst->x = 0; dst->y += ctx->line ? ctx->line : ctx->size; return 1; }
if(ctx->s) {
ctx->f = ctx->s;
ptr = _ssfn_c(ctx->f, str, &ret, &unicode);
} else {
/* find best match */
p = ctx->family;
ctx->f = NULL;
again: if(p >= SSFN_FAMILY_BYNAME) { n = 0; m = 4; } else n = m = p;
for(; n <= m; n++) {
fl = (ssfn_font_t **)ctx->fnt[n];
if(ctx->style & 3) {
/* check if we have a specific ctx->f for the requested style and size */
for(i=0;i<ctx->len[n];i++)
if(((fl[i]->type>>4) & 3) == (ctx->style & 3) && fl[i]->height == ctx->size &&
(ptr = _ssfn_c(fl[i], str, &ret, &unicode))) { ctx->f = fl[i]; break; }
/* if not, check if we have the requested size (for bitmap fonts) */
if(!ptr)
for(i=0;i<ctx->len[n];i++)
if(fl[i]->height == ctx->size && (ptr = _ssfn_c(fl[i], str, &ret, &unicode))) { ctx->f = fl[i]; break; }
/* if neither size+style nor size matched, look for style match */
if(!ptr)
for(i=0;i<ctx->len[n];i++)
if(((fl[i]->type>>4) & 3) == (ctx->style & 3) && (ptr = _ssfn_c(fl[i], str, &ret, &unicode)))
{ ctx->f = fl[i]; break; }
/* if bold italic was requested, check if we have at least bold or italic */
if(!ptr && (ctx->style & 3) == 3)
for(i=0;i<ctx->len[n];i++)
if(((fl[i]->type>>4) & 3) && (ptr = _ssfn_c(fl[i], str, &ret, &unicode))) { ctx->f = fl[i]; break; }
}
/* last resort, get the first ctx->f which has a glyph for this multibyte, no matter style */
if(!ptr) {
for(i=0;i<ctx->len[n];i++)
if((ptr = _ssfn_c(fl[i], str, &ret, &unicode))) { ctx->f = fl[i]; break; }
}
}
/* if glyph still not found, try any family group */
if(!ptr && p != SSFN_FAMILY_ANY) { p = SSFN_FAMILY_ANY; goto again; }
}
if(!ptr) {
if(ctx->style & SSFN_STYLE_NODEFGLYPH) return SSFN_ERR_NOGLYPH;
else {
unicode = 0;
if(ctx->family >= SSFN_FAMILY_BYNAME) { n = 0; m = 4; } else n = m = ctx->family;
for(; n <= m && !ptr; n++)
if(ctx->len[n] && ctx->fnt[n][0] && !(*((uint8_t*)ctx->fnt[n][0] + ctx->fnt[n][0]->characters_offs) & 0x80))
{ ctx->f = ctx->fnt[n][0]; ptr = (uint8_t*)ctx->f + ctx->f->characters_offs; }
}
if(!ptr) return SSFN_ERR_NOGLYPH;
}
if(!ctx->f || !ctx->f->height || !ctx->size) return SSFN_ERR_NOFACE;
if((unicode >> 16) > 0x10) return SSFN_ERR_INVINP;
ctx->rc = (ssfn_chr_t*)ptr; ptr += sizeof(ssfn_chr_t);
#ifdef SSFN_PROFILING
gettimeofday(&tv1, NULL);
tvd.tv_sec = tv1.tv_sec - tv0.tv_sec;
tvd.tv_usec = tv1.tv_usec - tv0.tv_usec;
if(tvd.tv_usec < 0) { tvd.tv_sec--; tvd.tv_usec += 1000000L; }
ctx->lookup += tvd.tv_sec * 1000000L + tvd.tv_usec;
memcpy(&tv0, &tv1, sizeof(struct timeval));
#endif
/* render glyph into cache */
#ifndef SSFN_MAXLINES
if(!(ctx->style & SSFN_STYLE_NOCACHE) && ctx->c[unicode >> 16] && ctx->c[unicode >> 16][(unicode >> 8) & 0xFF] &&
ctx->c[unicode >> 16][(unicode >> 8) & 0xFF][unicode & 0xFF]) {
ctx->g = ctx->c[unicode >> 16][(unicode >> 8) & 0xFF][unicode & 0xFF];
} else
#endif
{
h = ctx->style & SSFN_STYLE_NOAA ? ctx->size : (ctx->size > ctx->f->height ? (ctx->size + 4) & ~3 : ctx->f->height);
ci = (ctx->style & SSFN_STYLE_ITALIC) && !(SSFN_TYPE_STYLE(ctx->f->type) & SSFN_STYLE_ITALIC);
cb = (ctx->style & SSFN_STYLE_BOLD) && !(SSFN_TYPE_STYLE(ctx->f->type) & SSFN_STYLE_BOLD) ? (ctx->f->height+64)>>6 : 0;
w = (ctx->rc->w * h + ctx->f->height - 1) / ctx->f->height;
p = w + (ci ? h / SSFN_ITALIC_DIV : 0) + cb;
/* failsafe, should never happen */
if(p * h >= SSFN_DATA_MAX) return SSFN_ERR_BADSIZE;
#ifndef SSFN_MAXLINES
if(!(ctx->style & SSFN_STYLE_NOCACHE)) {
if(!ctx->c[unicode >> 16]) {
ctx->c[unicode >> 16] = (ssfn_glyph_t***)SSFN_realloc(NULL, 256 * sizeof(void*));
if(!ctx->c[unicode >> 16]) return SSFN_ERR_ALLOC;
SSFN_memset(ctx->c[unicode >> 16], 0, 256 * sizeof(void*));
}
if(!ctx->c[unicode >> 16][(unicode >> 8) & 0xFF]) {
ctx->c[unicode >> 16][(unicode >> 8) & 0xFF] = (ssfn_glyph_t**)SSFN_realloc(NULL, 256 * sizeof(void*));
if(!ctx->c[unicode >> 16][(unicode >> 8) & 0xFF]) return SSFN_ERR_ALLOC;
SSFN_memset(ctx->c[unicode >> 16][(unicode >> 8) & 0xFF], 0, 256 * sizeof(void*));
}
ctx->g = ctx->c[unicode >> 16][(unicode >> 8) & 0xFF][unicode & 0xFF] = (ssfn_glyph_t*)SSFN_realloc(NULL, p * h + 8);
if(!ctx->c[unicode >> 16][(unicode >> 8) & 0xFF][unicode & 0xFF]) return SSFN_ERR_ALLOC;
} else
#endif
ctx->g = &ctx->ga;
x = (ctx->rc->x > 0 && ci ? (ctx->f->height - ctx->f->baseline) * h / SSFN_ITALIC_DIV / ctx->f->height : 0);
ctx->g->p = p;
ctx->g->h = h;
ctx->g->x = ctx->rc->x + x;
ctx->g->y = ctx->rc->y;
ctx->g->o = (ctx->rc->t & 0x3F) + x;
SSFN_memset(&ctx->g->data, 0xFF, p * h);
color = 0xFE; ctx->g->a = ctx->g->d = 0;
for(n = 0; n < ctx->rc->n; n++) {
if(ptr[0] == 255 && ptr[1] == 255) { color = ptr[2]; ptr += ctx->rc->t & 0x40 ? 6 : 5; continue; }
x = ((ptr[0] + cb) << SSFN_PREC) * h / ctx->f->height; y = (ptr[1] << SSFN_PREC) * h / ctx->f->height;
if(ctx->rc->t & 0x40) { m = (ptr[5] << 24) | (ptr[4] << 16) | (ptr[3] << 8) | ptr[2]; ptr += 6; }
else { m = (ptr[4] << 16) | (ptr[3] << 8) | ptr[2]; ptr += 5; }
frg = (uint8_t*)ctx->f + m;
if(!(frg[0] & 0x80)) {
/* contour */
j = (frg[0] & 0x3F);
if(frg[0] & 0x40) { j <<= 8; j |= frg[1]; frg++; }
j++; frg++; tmp = frg; frg += (j+3)/4; ctx->np = 0;
for(i = 0; i < j; i++) {
k = (frg[0] << SSFN_PREC) * h / ctx->f->height + x; m = (frg[1] << SSFN_PREC) * h / ctx->f->height + y;
switch((tmp[i >> 2] >> ((i & 3) << 1)) & 3) {
case SSFN_CONTOUR_MOVE:
ctx->mx = ctx->lx = k; ctx->my = ctx->ly = m;
frg += 2;
break;
case SSFN_CONTOUR_LINE:
_ssfn_l(ctx, p << SSFN_PREC, h << SSFN_PREC, k, m);
frg += 2;
break;
case SSFN_CONTOUR_QUAD:
a = (frg[2] << SSFN_PREC) * h / ctx->f->height + x; A = (frg[3] << SSFN_PREC) * h / ctx->f->height + y;
_ssfn_b(ctx, p << SSFN_PREC,h << SSFN_PREC, ctx->lx,ctx->ly, ((a-ctx->lx)/2)+ctx->lx,
((A-ctx->ly)/2)+ctx->ly, ((k-a)/2)+a,((A-m)/2)+m, k,m, 0);
frg += 4;
break;
case SSFN_CONTOUR_CUBIC:
a = (frg[2] << SSFN_PREC) * h / ctx->f->height + x; A = (frg[3] << SSFN_PREC) * h / ctx->f->height + y;
b = (frg[4] << SSFN_PREC) * h / ctx->f->height + x; B = (frg[5] << SSFN_PREC) * h / ctx->f->height + y;
_ssfn_b(ctx, p << SSFN_PREC,h << SSFN_PREC, ctx->lx,ctx->ly, a,A, b,B, k,m, 0);
frg += 6;
break;
}
}
/* close path */
if(ctx->mx != ctx->lx || ctx->my != ctx->ly) {
ctx->p[ctx->np+0] = ctx->mx;
ctx->p[ctx->np+1] = ctx->my;
ctx->np += 2;
}
/* add rasterized vector layers to cached glyph */
if(ctx->np > 4) {
for(b = A = B = o = 0; b < h; b++, B += p) {
a = b << SSFN_PREC;
for(nr = 0, i = 0; i < ctx->np - 3; i += 2) {
if( (ctx->p[i+1] < a && ctx->p[i+3] >= a) ||
(ctx->p[i+3] < a && ctx->p[i+1] >= a)) {
if((ctx->p[i+1] >> SSFN_PREC) == (ctx->p[i+3] >> SSFN_PREC))
x = (((int)ctx->p[i]+(int)ctx->p[i+2])>>1);
else
x = ((int)ctx->p[i]) + ((a - (int)ctx->p[i+1])*
((int)ctx->p[i+2] - (int)ctx->p[i])/
((int)ctx->p[i+3] - (int)ctx->p[i+1]));
x >>= SSFN_PREC;
if(ci) x += (h - b) / SSFN_ITALIC_DIV;
if(cb && !o) {
if(ctx->g->data[B + x] != color) { o = -cb; A = cb; }
else { o = cb; A = -cb; }
}
for(k = 0; k < nr && x > r[k]; k++);
for(l = nr; l > k; l--) r[l] = r[l-1];
r[k] = x;
nr++;
}
}
if(nr > 1 && nr & 1) { r[nr - 2] = r[nr - 1]; nr--; }
if(nr) {
if(ctx->g->d < y + b) ctx->g->d = y + b;
for(i = 0; i < nr - 1; i += 2) {
l = r[i] + o; m = r[i + 1] + A;
if(l < 0) l = 0;
if(m > p) m = p;
if(i > 0 && l < r[i - 1] + A) l = r[i - 1] + A;
for(; l < m; l++)
ctx->g->data[B + l] = ctx->g->data[B + l] == color ? 0xFF : color;
}
}
}
}
} else if((frg[0] & 0x60) == 0x00) {
/* bitmap */
B = ((frg[0] & 0x1F) + 1) << 3; A = frg[1] + 1; x >>= SSFN_PREC; y >>= SSFN_PREC;
b = B * h / ctx->f->height; a = A * h / ctx->f->height;
if(ctx->g->d < y + a) ctx->g->d = y + a;
frg += 2;
for(j = 0; j < a; j++) {
k = j * A / a;
l = (y + j) * p + x + (ci ? (h - y - j) / SSFN_ITALIC_DIV : 0);
for(i = 0; i < b; i++) {
m = i * B / b;
if(frg[(k * B + m) >> 3] & (1 << (m & 7))) {
for(o = 0; o <= cb; o++)
ctx->g->data[l + i + o] = color;
}
}
}
if(!(ctx->style & SSFN_STYLE_NOAA)) {
m = color == 0xFD ? 0xFC : 0xFD; o = y * p + p + x;
for(k = h; k > ctx->f->height + 4; k -= 2*ctx->f->height) {
for(j = 1, l = o; j < a - 1; j++, l += p)
for(i = 1; i < b - 1; i++) {
if(ctx->g->data[l + i] == 0xFF && (ctx->g->data[l + i - p] == color ||
ctx->g->data[l + i + p] == color) && (ctx->g->data[l + i - 1] == color ||
ctx->g->data[l + i + 1] == color)) ctx->g->data[l + i] = m;
}
for(j = 1, l = o; j < a - 1; j++, l += p)
for(i = 1; i < b - 1; i++) {
if(ctx->g->data[l + i] == m) ctx->g->data[l + i] = color;
}
}
}
} else if((frg[0] & 0x60) == 0x20) {
/* pixmap */
k = (((frg[0] & 0x1F) << 8) | frg[1]) + 1; B = frg[2] + 1; A = frg[3] + 1; x >>= SSFN_PREC; y >>= SSFN_PREC;
b = B * h / ctx->f->height; a = A * h / ctx->f->height;
if(ctx->g->d < y + a) ctx->g->d = y + a;
frg += 4; end = frg + k; i = 0;
while(frg < end) {
l = ((*frg++) & 0x7F) + 1;
if(frg[-1] & 0x80) {
while(l--) dec[i++] = *frg;
frg++;
} else while(l--) dec[i++] = *frg++;
}
for(j = 0; j < a; j++) {
k = j * A / a * B;
l = (y + j) * p + x + (ci ? (h - y - j) / SSFN_ITALIC_DIV : 0);
for(i = 0; i < b; i++) {
m = dec[k + i * B / b];
if(m != 0xFF) ctx->g->data[l + i] = m;
}
}
}
color = 0xFE;
}
ctx->g->a = ctx->f->baseline;
if(ctx->g->d > ctx->g->a + 1) ctx->g->d -= ctx->g->a + 1; else ctx->g->d = 0;
#ifdef SSFN_DEBUGGLYPH
printf("\nU+%06X size %d p %d h %d base %d under %d overlap %d ascender %d descender %d advance x %d advance y %d cb %d\n",
unicode, ctx->size,p,h,ctx->f->baseline,ctx->f->underline,ctx->g->o,ctx->g->a,ctx->g->d,ctx->g->x,ctx->g->y,cb);
for(j = 0; j < h; j++) {
printf("%3d: ", j);
for(i = 0; i < p; i++) {
if(ctx->g->data[j*p+i] == 0xFF) printf(j == ctx->g->a ? "_" : ".");
else printf("%x", ctx->g->data[j*p+i] & 0xF);
}
printf("\n");
}
#endif
#ifdef SSFN_PROFILING
gettimeofday(&tv1, NULL);
tvd.tv_sec = tv1.tv_sec - tv0.tv_sec;
tvd.tv_usec = tv1.tv_usec - tv0.tv_usec;
if(tvd.tv_usec < 0) { tvd.tv_sec--; tvd.tv_usec += 1000000L; }
ctx->raster += tvd.tv_sec * 1000000L + tvd.tv_usec;
memcpy(&tv0, &tv1, sizeof(struct timeval));
#endif
}
if(dst) {
/* blit glyph from cache into buffer */
h = (ctx->style & SSFN_STYLE_ABS_SIZE) || SSFN_TYPE_FAMILY(ctx->f->type) == SSFN_FAMILY_MONOSPACE || !ctx->f->baseline ?
ctx->size : ctx->size * ctx->f->height / ctx->f->baseline;
if(h > ctx->line) ctx->line = h;
w = ctx->g->p * h / ctx->g->h;
s = ((ctx->g->x - ctx->g->o) * h + ctx->f->height - 1) / ctx->f->height;
n = ctx->size > 16 ? 2 : 1;
if(w < n) w = n;
if(s < n) s = n;
if(ctx->g->x) {
ctx->ox = ox = ((ctx->g->o * h + ctx->f->height - 1) / ctx->f->height) + (ctx->style & SSFN_STYLE_RTL ? w : 0);
ctx->oy = oy = (ctx->g->a * h + ctx->f->height - 1) / ctx->f->height;
} else { ctx->ox = ox = w / 2; ctx->oy = oy = 0; }
if(dst->ptr) {
j = dst->w < 0 ? -dst->w : dst->w;
cs = dst->w < 0 ? 16 : 0;
cb = (h + 64) >> 6; uix = w > s ? w : s; uax = 0;
n = (ctx->f->underline * h + ctx->f->height - 1) / ctx->f->height;
#ifdef SSFN_DEBUGGLYPH
printf("Scaling to w %d h %d (glyph %d %d, cache %d %d, font %d)\n",
w,h,ctx->rc->w,ctx->rc->h,ctx->g->p,ctx->g->h,ctx->f->height);
#endif
fR = (dst->fg >> 16) & 0xFF; fG = (dst->fg >> 8) & 0xFF; fB = (dst->fg >> 0) & 0xFF; fA = (dst->fg >> 24) & 0xFF;
bR = (dst->bg >> 16) & 0xFF; bG = (dst->bg >> 8) & 0xFF; bB = (dst->bg >> 0) & 0xFF;
Op = (uint32_t*)(dst->ptr + dst->p * (dst->y - oy) + ((dst->x - ox) << 2));
for (y = 0; y < h && dst->y + y - oy < dst->h; y++, Op += dst->p >> 2) {
if(dst->y + y - oy < 0) continue;
y0 = (y << 8) * ctx->g->h / h; Y0 = y0 >> 8; y1 = ((y + 1) << 8) * ctx->g->h / h; Y1 = y1 >> 8; Ol = Op;
for (x = 0; x < w && dst->x + x - ox < j; x++, Ol++) {
if(dst->x + x - ox < 0) continue;
m = 0; sR = sG = sB = sA = 0;
if(!dst->bg) {
/* real linear frame buffers should be accessed only as uint32_t on 32 bit boundary */
O = *Ol;
bR = (O >> (16 - cs)) & 0xFF;
bG = (O >> 8) & 0xFF;
bB = (O >> cs) & 0xFF;
}
x0 = (x << 8) * ctx->g->p / w; X0 = x0 >> 8; x1 = ((x + 1) << 8) * ctx->g->p / w; X1 = x1 >> 8;
for(ys = y0; ys < y1; ys += 256) {
if(ys >> 8 == Y0) { yp = 256 - (ys & 0xFF); ys &= ~0xFF; if(yp > y1 - y0) yp = y1 - y0; }
else if(ys >> 8 == Y1) yp = y1 & 0xFF; else yp = 256;
X2 = (ys >> 8) * ctx->g->p;
for(xs = x0; xs < x1; xs += 256) {
if (xs >> 8 == X0) {
k = 256 - (xs & 0xFF); xs &= ~0xFF; if(k > x1 - x0) k = x1 - x0; pc = k == 256 ? yp : (k * yp)>>8;
} else
if (xs >> 8 == X1) { k = x1 & 0xFF; pc = k == 256 ? yp : (k * yp) >> 8; }
else pc = yp;
m += pc;
k = ctx->g->data[X2 + (xs >> 8)];
if(k == 0xFF) {
sB += bB * pc; sG += bG * pc; sR += bR * pc; sA += 255;
} else {
if(k == 0xFE || !ctx->f->cmap_offs) {
dB = fB; dG = fG; dR = fR; dA = fA;
} else {
P = *((uint32_t*)((uint8_t*)ctx->f + ctx->f->cmap_offs + (k << 2)));
dR = (P >> 16) & 0xFF; dG = (P >> 8) & 0xFF; dB = (P >> 0) & 0xFF; dA = (P >> 24) & 0xFF;
}
if(dA == 255) {
sB += dB * pc; sG += dG * pc; sR += dR * pc; sA += dA * pc;
} else {
sB += (dB * dA + bB * (255 - dA)) * pc / 255; sG += (dG * dA + bG * (255 - dA)) * pc / 255;
sR += (dR * dA + bR * (255 - dA)) * pc / 255; sA += dA * pc;
}
}
}
}
if(m) { sR /= m; sG /= m; sB /= m; sA /= m; } else { sR >>= 8; sG >>= 8; sB >>= 8; sA >>= 8; }
if(sA > 15) {
*Ol = ((sA > 255 ? 255 : sA) << 24) | ((sR > 255 ? 255 : sR) << (16 - cs)) |
((sG > 255 ? 255 : sG) << 8) | ((sB > 255 ? 255 : sB) << cs);
if(y == n) { if(uix > x) { uix = x; } if(uax < x) { uax = x; } }
}
}
}
if(ctx->style & SSFN_STYLE_UNDERLINE) {
uix -= cb + 1; uax += cb + 2;
if(uax < uix) uax = uix + 1;
k = (w > s ? w : s);
Op = (uint32_t*)(dst->ptr + dst->p * (dst->y - oy + n) + ((dst->x - ox - 1) << 2));
for (y = n; y < n + cb && dst->y + y - oy < dst->h; y++, Op += dst->p >> 2) {
if(dst->y + y - oy < 0) continue;
for (Ol = Op, x = 0; x <= k && dst->x + x - ox < j; x++, Ol++) {
if(dst->x + x - ox < 0 || (x > uix && x < uax)) continue;
O = *Ol;
bR = (O >> (16 - cs)) & 0xFF;
bG = (O >> 8) & 0xFF;
bB = (O >> cs) & 0xFF;
bB += ((fB - bB) * fA) >> 8;
bG += ((fG - bG) * fA) >> 8;
bR += ((fR - bR) * fA) >> 8;
*Ol = (fA << 24) | (bR << (16 - cs)) | (bG << 8) | (bB << cs);
}
}
}
if(ctx->style & SSFN_STYLE_STHROUGH) {
n = (h >> 1); k = (w > s ? w : s) + 1;
Op = (uint32_t*)(dst->ptr + dst->p * (dst->y - oy + n) + ((dst->x - ox - 1) << 2));
for (y = n; y < n + cb && dst->y + y - oy < dst->h; y++, Op += dst->p >> 2) {
if(dst->y + y - oy < 0) continue;
for (Ol = Op, x = 0; x <= k && dst->x + x - ox < j; x++, Ol++) {
if(dst->x + x - ox < 0) continue;
O = *Ol;
bR = (O >> (16 - cs)) & 0xFF;
bG = (O >> 8) & 0xFF;
bB = (O >> cs) & 0xFF;
bB += ((fB - bB) * fA) >> 8;
bG += ((fG - bG) * fA) >> 8;
bR += ((fR - bR) * fA) >> 8;
*Ol = (fA << 24) | (bR << (16 - cs)) | (bG << 8) | (bB << cs);
}
}
}
#ifdef SSFN_PROFILING
gettimeofday(&tv1, NULL);
tvd.tv_sec = tv1.tv_sec - tv0.tv_sec;
tvd.tv_usec = tv1.tv_usec - tv0.tv_usec;
if(tvd.tv_usec < 0) { tvd.tv_sec--; tvd.tv_usec += 1000000L; }
ctx->blit += tvd.tv_sec * 1000000L + tvd.tv_usec;
memcpy(&tv0, &tv1, sizeof(struct timeval));
#endif
}
/* add advance and kerning */
ctx->ax = (ctx->style & SSFN_STYLE_RTL ? -s : s);
dst->x += ctx->ax;
dst->y += (ctx->g->y * h + ctx->f->height - 1) / ctx->f->height;
ptr = (uint8_t*)str + ret;
if(!(ctx->style & SSFN_STYLE_NOKERN) && ctx->f->kerning_offs && _ssfn_c(ctx->f, (const char*)ptr, &i, &P) && P > 32) {
ptr = (uint8_t*)ctx->rc + sizeof(ssfn_chr_t);
/* check all kerning fragments, because we might have both vertical and horizontal kerning offsets */
for(n = 0; n < ctx->rc->n; n++) {
if(ptr[0] == 255 && ptr[1] == 255) { ptr += ctx->rc->t & 0x40 ? 6 : 5; continue; }
x = ptr[0];
if(ctx->rc->t & 0x40) { m = (ptr[5] << 24) | (ptr[4] << 16) | (ptr[3] << 8) | ptr[2]; ptr += 6; }
else { m = (ptr[4] << 16) | (ptr[3] << 8) | ptr[2]; ptr += 5; }
frg = (uint8_t*)ctx->f + m;
if((frg[0] & 0xE0) == 0xC0) {
k = (((frg[0] & 0x1F) << 8) | frg[1]) + 1; frg += 2;
/* check if there's a kerning group for the next code point */
while(k--) {
m = ((frg[2] & 0xF) << 16) | (frg[1] << 8) | frg[0];
if(P >= (uint32_t)m && P <= (uint32_t)(((frg[5] & 0xF) << 16) | (frg[4] << 8) | frg[3])) {
P -= m;
m = ctx->f->kerning_offs + ((((frg[2] >> 4) & 0xF) << 24) | (((frg[5] >> 4) & 0xF) << 16) |
(frg[7] << 8) | frg[6]);
/* decode RLE compressed offsets */
tmp = (uint8_t*)ctx->f + m;
while(tmp < (uint8_t*)ctx->f + ctx->f->size - 4) {
if((tmp[0] & 0x7F) < P) {
P -= (tmp[0] & 0x7F) + 1;
tmp += 2 + (tmp[0] & 0x80 ? 0 : tmp[0] & 0x7F);
} else {
y = (int)((signed char)tmp[1 + ((tmp[0] & 0x80) ? 0 : P)]) * h / ctx->f->height;
if(x) dst->x += y; else dst->y += y;
break;
}
}
break;
}
frg += 8;
}
} /* if kerning fragment */
}
#ifdef SSFN_PROFILING
gettimeofday(&tv1, NULL);
tvd.tv_sec = tv1.tv_sec - tv0.tv_sec;
tvd.tv_usec = tv1.tv_usec - tv0.tv_usec;
if(tvd.tv_usec < 0) { tvd.tv_sec--; tvd.tv_usec += 1000000L; }
ctx->kern += tvd.tv_sec * 1000000L + tvd.tv_usec;
#endif
}
}
return ret;
}
/**
* Get the bounding box for a string
* @param ctx rendering context
* @param str string to measure
* @param w returned width
* @param h returned height
* @param left returned left margin
* @param top returned ascender
* @return error code
*/
int ssfn_bbox(ssfn_t *ctx, const char *str, int *w, int *h, int *left, int *top)
{
ssfn_buf_t buf;
int ret, f = 1, l = 0, t = 0;
if(!ctx || !str || !w || !h || !top || !left) return SSFN_ERR_INVINP;
*w = *h = *top = *left = 0;
if(!*str) return SSFN_OK;
SSFN_memset(&buf, 0, sizeof(ssfn_buf_t)); ctx->line = 0;
while((ret = ssfn_render(ctx, &buf, str))) {
if(ret < 0 || !ctx->g) return ret;
if(f) { f = 0; l = ctx->ox; buf.x += l; }
if(ctx->g->x) {
if(ctx->oy > t) t = ctx->oy;
} else {
if(buf.w < ctx->g->p) buf.w = ctx->g->p;
buf.h += ctx->g->y ? ctx->g->y : ctx->g->h;
}
str += ret;
}
if((ctx->style & SSFN_STYLE_ITALIC) && !(SSFN_TYPE_STYLE(ctx->f->type) & SSFN_STYLE_ITALIC))
buf.x += ctx->size / SSFN_ITALIC_DIV - l;
if(ctx->g->x) {
*w = buf.x;
*h = ctx->line;
*left = l;
*top = t;
} else {
*w = buf.w;
*h = buf.y;
*top = *left = 0;
}
return SSFN_OK;
}
/**
* Render text to a newly allocated pixel buffer
*
* @param ctx rendering context
* @param str string to measure
* @return a newly allocated pixel buffer or NULL
*/
ssfn_buf_t *ssfn_text(ssfn_t *ctx, const char *str, unsigned int fg)
{
#ifndef SSFN_MAXLINES
ssfn_buf_t *buf;
int ret;
if(!ctx || !str) return NULL;
buf = (ssfn_buf_t*)SSFN_realloc(NULL, sizeof(ssfn_buf_t));
if(!buf) return NULL;
SSFN_memset(buf, 0, sizeof(ssfn_buf_t));
buf->fg = fg;
if(!*str || ssfn_bbox(ctx, str, (int*)&buf->w, (int*)&buf->h, (int*)&buf->x, (int*)&buf->y) != SSFN_OK)
return buf;
buf->ptr = (uint8_t*)SSFN_realloc(NULL, buf->w * buf->h * sizeof(uint32_t));
SSFN_memset(buf->ptr, 0, buf->w * buf->h * sizeof(uint32_t));
while((ret = ssfn_render(ctx, buf, str)) > 0)
str += ret;
if(ret != SSFN_OK) { SSFN_free(buf->ptr); SSFN_free(buf); return NULL; }
return buf;
#else
(void)ctx;
(void)str;
(void)fg;
return NULL;
#endif
}
#endif /* SSFN_IMPLEMENTATION */
#if defined(SSFN_CONSOLEBITMAP_PALETTE) || defined(SSFN_CONSOLEBITMAP_HICOLOR) || defined(SSFN_CONSOLEBITMAP_TRUECOLOR)
/*** special console bitmap font renderer (ca. 1.5k, no dependencies, no memory allocation and no error checking) ***/
/**
* public variables to configure
*/
ssfn_font_t *ssfn_src; /* font buffer with an inflated bitmap font */
ssfn_buf_t ssfn_dst; /* destination frame buffer */
/**
* Minimal OS kernel console renderer
*
* @param unicode character
* @return error code
*/
int ssfn_putc(uint32_t unicode)
{
# ifdef SSFN_CONSOLEBITMAP_PALETTE
# define SSFN_PIXEL uint8_t
# else
# ifdef SSFN_CONSOLEBITMAP_HICOLOR
# define SSFN_PIXEL uint16_t
# else
# define SSFN_PIXEL uint32_t
# endif
# endif
register SSFN_PIXEL *o, *p;
register uint8_t *ptr, *chr = NULL, *frg;
register int i, j, k, l, m, y = 0, w, s = ssfn_dst.p / sizeof(SSFN_PIXEL);
if(!ssfn_src || ssfn_src->magic[0] != 'S' || ssfn_src->magic[1] != 'F' || ssfn_src->magic[2] != 'N' ||
ssfn_src->magic[3] != '2' || !ssfn_dst.ptr || !ssfn_dst.p) return SSFN_ERR_INVINP;
if(unicode == '\r' || unicode == '\n') {
ssfn_dst.x = 0; if(unicode == '\n') { ssfn_dst.y += ssfn_src->height; } return SSFN_OK;
}
w = ssfn_dst.w < 0 ? -ssfn_dst.w : ssfn_dst.w;
for(ptr = (uint8_t*)ssfn_src + ssfn_src->characters_offs, i = 0; i < 0x110000; i++) {
if(ptr[0] == 0xFF) { i += 65535; ptr++; }
else if((ptr[0] & 0xC0) == 0xC0) { j = (((ptr[0] & 0x3F) << 8) | ptr[1]); i += j; ptr += 2; }
else if((ptr[0] & 0xC0) == 0x80) { j = (ptr[0] & 0x3F); i += j; ptr++; }
else { if((uint32_t)i == unicode) { chr = ptr; break; } ptr += 6 + ptr[1] * (ptr[0] & 0x40 ? 6 : 5); }
}
if(!chr) return SSFN_ERR_NOGLYPH;
ptr = chr + 6; o = (SSFN_PIXEL*)((uint8_t*)ssfn_dst.ptr + ssfn_dst.y * ssfn_dst.p + ssfn_dst.x * sizeof(SSFN_PIXEL));
for(i = 0; i < chr[1]; i++, ptr += chr[0] & 0x40 ? 6 : 5) {
if(ptr[0] == 255 && ptr[1] == 255) continue;
frg = (uint8_t*)ssfn_src + (chr[0] & 0x40 ? ((ptr[5] << 24) | (ptr[4] << 16) | (ptr[3] << 8) | ptr[2]) :
((ptr[4] << 16) | (ptr[3] << 8) | ptr[2]));
if((frg[0] & 0xE0) != 0x80) continue;
if(ssfn_dst.bg) {
for(; y < ptr[1] && (!ssfn_dst.h || ssfn_dst.y + y < ssfn_dst.h); y++, o += s) {
for(p = o, j = 0; j < chr[2] && (!w || ssfn_dst.x + j < w); j++, p++)
*p = ssfn_dst.bg;
}
} else { o += (int)(ptr[1] - y) * s; y = ptr[1]; }
k = ((frg[0] & 0x1F) + 1) << 3; j = frg[1] + 1; frg += 2;
for(m = 1; j && (!ssfn_dst.h || ssfn_dst.y + y < ssfn_dst.h); j--, y++, o += s)
for(p = o, l = 0; l < k; l++, p++, m <<= 1) {
if(m > 0x80) { frg++; m = 1; }
if(ssfn_dst.x + l >= 0 && (!w || ssfn_dst.x + l < w)) {
if(*frg & m) {
*p = ssfn_dst.fg;
} else if(ssfn_dst.bg) {
*p = ssfn_dst.bg;
}
}
}
}
if(ssfn_dst.bg)
for(; y < chr[3] && (!ssfn_dst.h || ssfn_dst.y + y < ssfn_dst.h); y++, o += s) {
for(p = o, j = 0; j < chr[2] && (!w || ssfn_dst.x + j < w); j++, p++)
*p = ssfn_dst.bg;
}
ssfn_dst.x += chr[4]; ssfn_dst.y += chr[5];
return SSFN_OK;
}
#endif /* SSFN_CONSOLEBITMAP */
#ifdef __cplusplus
}
/*** SSFN C++ Wrapper Class ***/
#include <string>
namespace SSFN {
#ifndef SSFN_IMPLEMENTATION
class Font {
public:
Font();
~Font();
public:
int Load(const std::string &data);
int Load(const unsigned char *data, int len);
int Select(int family, const std::string &name, int style, int size);
int Select(int family, const char *name, int style, int size);
int Render(ssfn_buf_t *dst, const std::string &str);
int Render(ssfn_buf_t *dst, const char *str);
int BBox(const std::string &str, int *w, int *h, int *left, int *top);
int BBox(const char *str, int *w, int *h, int *left, int *top);
ssfn_buf_t *Text(const std::string &str, unsigned int fg);
ssfn_buf_t *Text(const char *str, unsigned int fg);
int LineHeight();
int Mem();
const std::string ErrorStr(int err);
};
#else
class Font {
private:
ssfn_t ctx;
public:
Font() { SSFN_memset(&this->ctx, 0, sizeof(ssfn_t)); }
~Font() { ssfn_free(&this->ctx); }
public:
int Load(const std::string &data) { return ssfn_load(&this->ctx,(const void*)data.data()); }
int Load(const unsigned char *data) { return ssfn_load(&this->ctx, (const void*)data); }
int Select(int family, const std::string &name, int style, int size)
{ return ssfn_select(&this->ctx, family, (char*)name.data(), style, size); }
int Select(int family, char *name, int style, int size) { return ssfn_select(&this->ctx,family,name,style,size); }
int Render(ssfn_buf_t *dst, const std::string &str) { return ssfn_render(&this->ctx,dst,(const char*)str.data()); }
int Render(ssfn_buf_t *dst, const char *str) { return ssfn_render(&this->ctx, dst, str); }
int BBox(const std::string &str, int *w, int *h, int *left, int *top)
{ return ssfn_bbox(&this->ctx, (const char *)str.data(), w, h, left, top); }
int BBox(const char *str, int *w, int *h, int *left, int *top) { return ssfn_bbox(&this->ctx,str,w,h,left,top); }
ssfn_buf_t *Text(const std::string &str, unsigned int fg)
{ return ssfn_text(&this->ctx,(const char*)str.data(), fg); }
ssfn_buf_t *Text(const char *str, unsigned int fg) { return ssfn_text(&this->ctx, str, fg); }
int LineHeight() { return this->ctx->line ? this->ctx->line : this->ctx->size; }
int Mem() { return ssfn_mem(&this->ctx); }
const std::string ErrorStr(int err) { return std::string(ssfn_error(err)); }
};
#endif
}
#endif
/**/
#endif /* _SSFN_H_ */
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