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ttf.c
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ttf.c
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//
// Implementation file for TTF library
//
// https://github.com/michaelrsweet/ttf
//
// Copyright © 2018-2023 by Michael R Sweet.
//
// Licensed under Apache License v2.0. See the file "LICENSE" for more
// information.
//
#ifdef _WIN32
# define _CRT_SECURE_NO_WARNINGS
#endif // _WIN32
#include "ttf.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <fcntl.h>
#ifdef _WIN32
# include <io.h>
# include <direct.h>
//
// Microsoft renames the POSIX functions to _name, and introduces
// a broken compatibility layer using the original names. As a result,
// random crashes can occur when, for example, strdup() allocates memory
// from a different heap than used by malloc() and free().
//
// To avoid moronic problems like this, we #define the POSIX function
// names to the corresponding non-standard Microsoft names.
//
# define access _access
# define close _close
# define fileno _fileno
# define lseek _lseek
# define mkdir(d,p) _mkdir(d)
# define open _open
# define read _read
# define rmdir _rmdir
# define snprintf _snprintf
# define strdup _strdup
# define unlink _unlink
# define vsnprintf _vsnprintf
# define write _write
//
// Map various parameters for POSIX...
//
# define F_OK 00
# define W_OK 02
# define R_OK 04
# define O_BINARY _O_BINARY
# define O_RDONLY _O_RDONLY
# define O_WRONLY _O_WRONLY
# define O_CREAT _O_CREAT
# define O_TRUNC _O_TRUNC
typedef __int64 ssize_t; // POSIX type not present on Windows...
#else
# include <unistd.h>
# define O_BINARY 0
#endif // _WIN32
//
// DEBUG is typically defined for debug builds. TTF_DEBUG maps to fprintf when
// DEBUG is defined and is a no-op otherwise...
//
#ifdef DEBUG
# define TTF_DEBUG(...) fprintf(stderr, __VA_ARGS__)
#else
# define TTF_DEBUG(...)
#endif // DEBUG
//
// TTF_FORMAT_ARGS tells the compiler to validate printf-style format
// arguments, producing warnings when there are issues...
//
#if defined(__has_extension) || defined(__GNUC__)
# define TTF_FORMAT_ARGS(a,b) __attribute__ ((__format__(__printf__, a, b)))
#else
# define TTF_FORMAT_ARGS(a,b)
#endif // __has_extension || __GNUC__
//
// Constants...
//
#define TTF_FONT_MAX_CHAR 262144 // Maximum number of character values
//
// TTF/OFF tag constants...
//
#define TTF_OFF_cmap 0x636d6170 // Character to glyph mapping
#define TTF_OFF_head 0x68656164 // Font header
#define TTF_OFF_hhea 0x68686561 // Horizontal header
#define TTF_OFF_hmtx 0x686d7478 // Horizontal metrics
#define TTF_OFF_maxp 0x6d617870 // Maximum profile
#define TTF_OFF_name 0x6e616d65 // Naming table
#define TTF_OFF_OS_2 0x4f532f32 // OS/2 and Windows specific metrics
#define TTF_OFF_post 0x706f7374 // PostScript information
#define TTF_OFF_Unicode 0 // Unicode platform ID
#define TTF_OFF_Mac 1 // Macintosh platform ID
#define TTF_OFF_Mac_Roman 0 // Macintosh Roman encoding ID
#define TTF_OFF_Mac_USEnglish 0 // Macintosh US English language ID
#define TTF_OFF_Windows 3 // Windows platform ID
#define TTF_OFF_Windows_English 9 // Windows English language ID base
#define TTF_OFF_Windows_UCS2 1 // Windows UCS-2 encoding
#define TTF_OFF_Windows_UCS4 10 // Windows UCS-4 encoding
#define TTF_OFF_Copyright 0 // Copyright naming string
#define TTF_OFF_FontFamily 1 // Font family naming string ("Arial")
#define TTF_OFF_FontSubfamily 2 // Font sub-family naming string ("Bold")
#define TTF_OFF_FontFullName 4 // Font full name ("Arial Bold")
#define TTF_OFF_FontVersion 5 // Font version number
#define TTF_OFF_PostScriptName 6 // Font PostScript name
//
// Local types...
//
typedef struct _ttf_metric_s //*** Font metric information ****/
{
short width, // Advance width
left_bearing; // Left side bearing
} _ttf_metric_t;
typedef struct _ttf_off_dir_s // OFF/TTF directory entry
{
unsigned tag; // Table identifier
unsigned checksum; // Checksum of table
unsigned offset; // Offset from the beginning of the file
unsigned length; // Length
} _ttf_off_dir_t;
typedef struct _ttf_off_table_s // OFF/TTF offset table
{
int num_entries; // Number of table entries
_ttf_off_dir_t *entries; // Table entries
} _ttf_off_table_t;
typedef struct _ttf_off_name_s // OFF/TTF name string
{
unsigned short platform_id, // Platform identifier
encoding_id, // Encoding identifier
language_id, // Language identifier
name_id, // Name identifier
length, // Length of string
offset; // Offset from start of storage area
} _ttf_off_name_t;
typedef struct _ttf_off_names_s // OFF/TTF naming table
{
int num_names; // Number of names
_ttf_off_name_t *names; // Names
unsigned char *storage; // Storage area
unsigned storage_size; // Size of storage area
} _ttf_off_names_t;
struct _ttf_s
{
int fd; // File descriptor
size_t idx; // Font number in file
ttf_err_cb_t err_cb; // Error callback, if any
void *err_data; // Error callback data
_ttf_off_table_t table; // Offset table
_ttf_off_names_t names; // Names
size_t num_fonts; // Number of fonts in this file
char *copyright; // Copyright string
char *family; // Font family string
char *postscript_name; // PostScript name string
char *version; // Font version string
bool is_fixed; // Is this a fixed-width font?
int max_char, // Last character in font
min_char; // First character in font
size_t num_cmap; // Number of entries in glyph map
int *cmap; // Unicode character to glyph map
_ttf_metric_t *widths[TTF_FONT_MAX_CHAR / 256];
// Character metrics (sparse array)
float units; // Width units
short ascent, // Maximum ascent above baseline
descent, // Maximum descent below baseline
cap_height, // "A" height
x_height, // "x" height
x_max, // Bounding box
x_min,
y_max,
y_min,
weight; // Font weight
float italic_angle; // Angle of italic text
ttf_stretch_t stretch; // Font stretch value
ttf_style_t style; // Font style
};
typedef struct _ttf_off_cmap4_s // Format 4 cmap table
{
unsigned short startCode, // First character
endCode, // Last character
idRangeOffset; // Offset for range (modulo 65536)
short idDelta; // Delta for range (modulo 65536)
} _ttf_off_cmap4_t;
typedef struct _ttf_off_cmap12_s // Format 12 cmap table
{
unsigned startCharCode, // First character
endCharCode, // Last character
startGlyphID; // Glyph index for the first character
} _ttf_off_cmap12_t;
typedef struct _ttf_off_cmap13_s // Format 13 cmap table
{
unsigned startCharCode, // First character
endCharCode, // Last character
glyphID; // Glyph index for all characters
} _ttf_off_cmap13_t;
typedef struct _ttf_off_head_s // Font header
{
unsigned short unitsPerEm; // Units for widths/coordinates
short xMin, // Bounding box of all glyphs
yMin,
xMax,
yMax;
unsigned short macStyle; // Mac style bits
} _ttf_off_head_t;
#define TTF_OFF_macStyle_Bold 0x01
#define TTF_OFF_macStyle_Italic 0x02
#define TTF_OFF_macStyle_Underline 0x04
#define TTF_OFF_macStyle_Outline 0x08
#define TTF_OFF_macStyle_Shadow 0x10
#define TTF_OFF_macStyle_Condensed 0x20
#define TTF_OFF_macStyle_Extended 0x40
typedef struct _ttf_off_hhea_s // Horizontal header
{
short ascender, // Ascender
descender; // Descender
int numberOfHMetrics; // Number of horizontal metrics
} _ttf_off_hhea_t;
typedef struct _ttf_off_os_2_s // OS/2 information
{
unsigned short usWeightClass, // Font weight
usWidthClass, // Font weight
fsType; // Type bits
short sTypoAscender, // Ascender
sTypoDescender, // Descender
sxHeight, // xHeight
sCapHeight; // CapHeight
} _ttf_off_os_2_t;
typedef struct _ttf_off_post_s // PostScript information
{
float italicAngle; // Italic angle
unsigned isFixedPitch; // Fixed-width font?
} _ttf_off_post_t;
//
// Local functions...
//
static char *copy_name(ttf_t *font, unsigned name_id);
static void errorf(ttf_t *font, const char *message, ...) TTF_FORMAT_ARGS(2,3);
static bool read_cmap(ttf_t *font);
static bool read_head(ttf_t *font, _ttf_off_head_t *head);
static bool read_hhea(ttf_t *font, _ttf_off_hhea_t *hhea);
static _ttf_metric_t *read_hmtx(ttf_t *font, _ttf_off_hhea_t *hhea);
static int read_maxp(ttf_t *font);
static bool read_names(ttf_t *font);
static bool read_os_2(ttf_t *font, _ttf_off_os_2_t *os_2);
static bool read_post(ttf_t *font, _ttf_off_post_t *post);
static int read_short(ttf_t *font);
static bool read_table(ttf_t *font);
static unsigned read_ulong(ttf_t *font);
static int read_ushort(ttf_t *font);
static unsigned seek_table(ttf_t *font, unsigned tag, unsigned offset, bool required);
//
// 'ttfCreate()' - Create a new font object for the named font family.
//
ttf_t * // O - New font object
ttfCreate(const char *filename, // I - Filename
size_t idx, // I - Font number to create in collection (0-based)
ttf_err_cb_t err_cb, // I - Error callback or `NULL` to log to stderr
void *err_data) // I - Error callback data
{
ttf_t *font = NULL; // New font object
size_t i; // Looping var
_ttf_metric_t *widths = NULL; // Glyph metrics
_ttf_off_head_t head; // head table
_ttf_off_hhea_t hhea; // hhea table
_ttf_off_os_2_t os_2; // OS/2 table
_ttf_off_post_t post; // PostScript table
TTF_DEBUG("ttfCreate(filename=\"%s\", idx=%u, err_cb=%p, err_data=%p)\n", filename, (unsigned)idx, err_cb, err_data);
// Range check input..
if (!filename)
{
errno = EINVAL;
return (NULL);
}
// Allocate memory...
if ((font = (ttf_t *)calloc(1, sizeof(ttf_t))) == NULL)
return (NULL);
font->idx = idx;
font->err_cb = err_cb;
font->err_data = err_data;
// Open the font file...
if ((font->fd = open(filename, O_RDONLY | O_BINARY)) < 0)
{
errorf(font, "Unable to open '%s': %s", filename, strerror(errno));
goto error;
}
TTF_DEBUG("ttfCreate: fd=%d\n", font->fd);
// Read the table of contents and the identifying names...
if (!read_table(font))
goto error;
TTF_DEBUG("ttfCreate: num_entries=%d\n", font->table.num_entries);
if (!read_names(font))
goto error;
TTF_DEBUG("ttfCreate: num_names=%d\n", font->names.num_names);
// Copy key font meta data strings...
font->copyright = copy_name(font, TTF_OFF_Copyright);
font->family = copy_name(font, TTF_OFF_FontFamily);
font->postscript_name = copy_name(font, TTF_OFF_PostScriptName);
font->version = copy_name(font, TTF_OFF_FontVersion);
if (read_post(font, &post))
{
font->italic_angle = post.italicAngle;
font->is_fixed = post.isFixedPitch != 0;
}
TTF_DEBUG("ttfCreate: copyright=\"%s\"\n", font->copyright);
TTF_DEBUG("ttfCreate: family=\"%s\"\n", font->family);
TTF_DEBUG("ttfCreate: postscript_name=\"%s\"\n", font->postscript_name);
TTF_DEBUG("ttfCreate: version=\"%s\"\n", font->version);
TTF_DEBUG("ttfCreate: italic_angle=%g\n", font->italic_angle);
TTF_DEBUG("ttfCreate: is_fixed=%s\n", font->is_fixed ? "true" : "false");
if (!read_cmap(font))
goto error;
if (!read_head(font, &head))
goto error;
font->units = (float)head.unitsPerEm;
font->x_max = head.xMax;
font->x_min = head.xMin;
font->y_max = head.yMax;
font->y_min = head.yMin;
if (head.macStyle & TTF_OFF_macStyle_Italic)
{
if (font->postscript_name && strstr(font->postscript_name, "Oblique"))
font->style = TTF_STYLE_OBLIQUE;
else
font->style = TTF_STYLE_ITALIC;
}
else
font->style = TTF_STYLE_NORMAL;
if (!read_hhea(font, &hhea))
goto error;
font->ascent = hhea.ascender;
font->descent = hhea.descender;
if (read_maxp(font) < 0)
goto error;
if (hhea.numberOfHMetrics > 0)
{
if ((widths = read_hmtx(font, &hhea)) == NULL)
goto error;
}
else
{
errorf(font, "Number of horizontal metrics is 0.");
goto error;
}
if (read_os_2(font, &os_2))
{
// Copy key values from OS/2 table...
static const ttf_stretch_t stretches[] =
{
TTF_STRETCH_ULTRA_CONDENSED, // ultra-condensed
TTF_STRETCH_EXTRA_CONDENSED, // extra-condensed
TTF_STRETCH_CONDENSED, // condensed
TTF_STRETCH_SEMI_CONDENSED, // semi-condensed
TTF_STRETCH_NORMAL, // normal
TTF_STRETCH_SEMI_EXPANDED, // semi-expanded
TTF_STRETCH_EXPANDED, // expanded
TTF_STRETCH_EXTRA_EXPANDED, // extra-expanded
TTF_STRETCH_ULTRA_EXPANDED // ultra-expanded
};
if (os_2.usWidthClass >= 1 && os_2.usWidthClass <= (int)(sizeof(stretches) / sizeof(stretches[0])))
font->stretch = stretches[os_2.usWidthClass - 1];
font->weight = (short)os_2.usWeightClass;
font->cap_height = os_2.sCapHeight;
font->x_height = os_2.sxHeight;
}
else
{
// Default key values since there isn't an OS/2 table...
TTF_DEBUG("ttfCreate: Unable to read OS/2 table.\n");
font->weight = 400;
}
if (font->cap_height == 0)
font->cap_height = font->ascent;
if (font->x_height == 0)
font->x_height = 3 * font->ascent / 5;
// Build a sparse glyph widths table...
font->min_char = -1;
for (i = 0; i < font->num_cmap; i ++)
{
if (font->cmap[i] >= 0)
{
int bin = (int)i / 256, // Sub-array bin
glyph = font->cmap[i]; // Glyph index
// Update min/max...
if (font->min_char < 0)
font->min_char = (int)i;
font->max_char = (int)i;
// Allocate a sub-array as needed...
if (!font->widths[bin])
font->widths[bin] = (_ttf_metric_t *)calloc(256, sizeof(_ttf_metric_t));
// Copy the width of the specified glyph or the last one if we are past
// the end of the table...
if (glyph >= hhea.numberOfHMetrics)
font->widths[bin][i & 255] = widths[hhea.numberOfHMetrics - 1];
else
font->widths[bin][i & 255] = widths[glyph];
}
#ifdef DEBUG
if (i >= ' ' && i < 127 && font->widths[0])
TTF_DEBUG("ttfCreate: width['%c']=%d(%d)\n", (char)i, font->widths[0][i].width, font->widths[0][i].left_bearing);
#endif // DEBUG
}
// Cleanup and return the font...
free(widths);
return (font);
// If we get here something bad happened...
error:
free(widths);
ttfDelete(font);
return (NULL);
}
//
// 'ttfDelete()' - Free all memory used for a font family object.
//
void
ttfDelete(ttf_t *font) // I - Font
{
int i; // Looping var
// Range check input...
if (!font)
return;
// Close the font file...
if (font->fd >= 0)
close(font->fd);
// Free all memory used...
free(font->copyright);
free(font->family);
free(font->postscript_name);
free(font->version);
free(font->table.entries);
free(font->names.names);
free(font->names.storage);
free(font->cmap);
for (i = 0; i < 256; i ++)
free(font->widths[i]);
free(font);
}
//
// 'ttfGetAscent()' - Get the maximum height of non-accented characters.
//
int // O - Ascent in 1000ths
ttfGetAscent(ttf_t *font) // I - Font
{
return (font ? (int)(1000 * font->ascent / font->units) : 0);
}
//
// 'ttfGetBounds()' - Get the bounds of all characters in a font.
//
ttf_rect_t * // O - Bounds or `NULL` on error
ttfGetBounds(ttf_t *font, // I - Font
ttf_rect_t *bounds) // I - Bounds buffer
{
// Range check input...
if (!font || !bounds)
{
if (bounds)
memset(bounds, 0, sizeof(ttf_rect_t));
return (NULL);
}
bounds->left = 1000.0f * font->x_min / font->units;
bounds->right = 1000.0f * font->x_max / font->units;
bounds->bottom = 1000.0f * font->y_min / font->units;
bounds->top = 1000.0f * font->y_max / font->units;
return (bounds);
}
//
// 'ttfGetCapHeight()' - Get the height of capital letters.
//
int // O - Capital letter height in 1000ths
ttfGetCapHeight(ttf_t *font) // I - Font
{
return (font ? (int)(1000 * font->cap_height / font->units) : 0);
}
//
// 'ttfGetCMap()' - Get the Unicode to glyph mapping table.
//
const int * // O - CMap table
ttfGetCMap(ttf_t *font, // I - Font
size_t *num_cmap) // O - Number of entries in table
{
// Range check input...
if (!font || !num_cmap)
{
if (num_cmap)
*num_cmap = 0;
return (NULL);
}
*num_cmap = font->num_cmap;
return (font->cmap);
}
//
// 'ttfGetCopyright()' - Get the copyright text for a font.
//
const char * // O - Copyright text
ttfGetCopyright(ttf_t *font) // I - Font
{
return (font ? font->copyright : NULL);
}
//
// 'ttfGetDescent()' - Get the maximum depth of non-accented characters.
//
int // O - Descent in 1000ths
ttfGetDescent(ttf_t *font) // I - Font
{
return (font ? (int)(1000 * font->descent / font->units) : 0);
}
//
// 'ttfGetExtents()' - Get the extents of a UTF-8 string.
//
// This function computes the extents of a UTF-8 string when rendered using the
// specified font and size.
//
ttf_rect_t * // O - Pointer to extents or `NULL` on error
ttfGetExtents(
ttf_t *font, // I - Font
float size, // I - Font size
const char *s, // I - String
ttf_rect_t *extents) // O - Extents of the string
{
bool first = true; // First character?
int ch, // Current character
width = 0; // Width
_ttf_metric_t *widths; // Widths
TTF_DEBUG("ttfGetExtents(font=%p, size=%.2f, s=\"%s\", extents=%p)\n", (void *)font, size, s, (void *)extents);
// Make sure extents is zeroed out...
if (extents)
memset(extents, 0, sizeof(ttf_rect_t));
// Range check input...
if (!font || size <= 0.0f || !s || !extents)
return (NULL);
// Loop through the string...
while (*s)
{
// Get the next Unicode character...
if ((*s & 0xe0) == 0xc0 && (s[1] & 0xc0) == 0x80)
{
// Two byte UTF-8
ch = ((*s & 0x1f) << 6) | (s[1] & 0x3f);
s += 2;
}
else if ((*s & 0xf0) == 0xe0 && (s[1] & 0xc0) == 0x80 && (s[2] & 0xc0) == 0x80)
{
// Three byte UTF-8
ch = ((*s & 0x0f) << 12) | ((s[1] & 0x3f) << 6) | (s[2] & 0x3f);
s += 3;
}
else if ((*s & 0xf8) == 0xf0 && (s[1] & 0xc0) == 0x80 && (s[2] & 0xc0) == 0x80 && (s[3] & 0xc0) == 0x80)
{
// Four byte UTF-8
ch = ((*s & 0x07) << 18) | ((s[1] & 0x3f) << 12) | ((s[2] & 0x3f) << 6) | (s[3] & 0x3f);
s += 4;
}
else if (*s & 0x80)
{
// Invalid UTF-8
errorf(font, "Invalid UTF-8 sequence starting with 0x%02X.", *s & 255);
return (NULL);
}
else
{
// ASCII...
ch = *s++;
}
// Find its width...
if ((widths = font->widths[ch / 256]) != NULL)
{
if (first)
{
extents->left = -widths[ch & 255].left_bearing / font->units;
first = false;
}
width += widths[ch & 255].width;
}
else if ((widths = font->widths[0]) != NULL)
{
// Use the ".notdef" (0) glyph width...
if (first)
{
extents->left = -widths[0].left_bearing / font->units;
first = false;
}
width += widths[0].width;
}
}
// Calculate the bounding box for the text and return...
TTF_DEBUG("ttfGetExtents: width=%d\n", width);
extents->bottom = size * font->y_min / font->units;
extents->right = size * width / font->units + extents->left;
extents->top = size * font->y_max / font->units;
return (extents);
}
//
// 'ttfGetFamily()' - Get the family name of a font.
//
const char * // O - Family name
ttfGetFamily(ttf_t *font) // I - Font
{
return (font ? font->family : NULL);
}
//
// 'ttfGetItalicAngle()' - Get the italic angle.
//
float // O - Angle in degrees
ttfGetItalicAngle(ttf_t *font) // I - Font
{
return (font ? font->italic_angle : 0.0f);
}
//
// 'ttfGetMaxChar()' - Get the last character in the font.
//
int // O - Last character in font
ttfGetMaxChar(ttf_t *font) // I - Font
{
return (font ? font->max_char : 0);
}
//
// 'ttfGetMinChar()' - Get the first character in the font.
//
int // O - First character in font
ttfGetMinChar(ttf_t *font) // I - Font
{
return (font ? font->min_char : 0);
}
//
// 'ttfGetNumFonts()' - Get the number of fonts in this collection.
//
size_t // O - Number of fonts
ttfGetNumFonts(ttf_t *font) // I - Font
{
return (font ? font->num_fonts : 0);
}
//
// 'ttfGetPostScriptName()' - Get the PostScript name of a font.
//
const char * // O - PostScript name
ttfGetPostScriptName(
ttf_t *font) // I - Font
{
return (font ? font->postscript_name : NULL);
}
//
// 'ttfGetStretch()' - Get the font "stretch" value...
//
ttf_stretch_t // O - Stretch value
ttfGetStretch(ttf_t *font) // I - Font
{
return (font ? font->stretch : TTF_STRETCH_NORMAL);
}
//
// 'ttfGetStyle()' - Get the font style.
//
ttf_style_t // O - Style
ttfGetStyle(ttf_t *font) // I - Font
{
return (font ? font->style : TTF_STYLE_NORMAL);
}
//
// 'ttfGetVersion()' - Get the version number of a font.
//
const char * // O - Version number
ttfGetVersion(ttf_t *font) // I - Font
{
return (font ? font->version : NULL);
}
//
// 'ttfGetWeight()' - Get the weight of a font.
//
ttf_weight_t // O - Weight
ttfGetWeight(ttf_t *font) // I - Font
{
return (font ? (ttf_weight_t)font->weight : TTF_WEIGHT_400);
}
//
// 'ttfGetWidth()' - Get the width of a single character.
//
int // O - Width in 1000ths
ttfGetWidth(ttf_t *font, // I - Font
int ch) // I - Unicode character
{
int bin = ch >> 8; // Bin in widths array
// Range check input...
if (!font || ch < ' ' || ch == 0x7f)
return (0);
if (font->widths[bin])
return ((int)(1000.0f * font->widths[bin][ch & 255].width / font->units));
else if (font->widths[0]) // .notdef
return ((int)(1000.0f * font->widths[0][0].width / font->units));
else
return (0);
}
//
// 'ttfGetXHeight()' - Get the height of lowercase letters.
//
int // O - Lowercase letter height in 1000ths
ttfGetXHeight(ttf_t *font) // I - Font
{
return (font ? (int)(1000 * font->x_height / font->units) : 0);
}
//
// 'ttfIsFixedPitch()' - Determine whether a font is fixedpitch.
//
bool // O - `true` if fixed pitch, `false` otherwise
ttfIsFixedPitch(ttf_t *font) // I - Font
{
return (font ? font->is_fixed : false);
}
//
// 'copy_name()' - Copy a name string from a font.
//
static char * // O - Name string or `NULL`
copy_name(ttf_t *font, // I - Font
unsigned name_id) // I - Name identifier
{
int i; // Looping var
_ttf_off_name_t *name; // Current name
for (i = font->names.num_names, name = font->names.names; i > 0; i --, name ++)
{
if (name->name_id == name_id &&
((name->platform_id == TTF_OFF_Mac && name->language_id == TTF_OFF_Mac_USEnglish) ||
(name->platform_id == TTF_OFF_Windows && (name->language_id & 0xff) == TTF_OFF_Windows_English)))
{
char temp[1024], // Temporary string buffer
*tempptr, // Pointer into temporary string
*storptr; // Pointer into storage
int chars, // Length of string to copy in characters
bpc; // Bytes per character
if ((unsigned)(name->offset + name->length) > font->names.storage_size)
{
TTF_DEBUG("copy_name: offset(%d)+length(%d) > storage_size(%d)\n", name->offset, name->length, font->names.storage_size);
continue;
}
if (name->platform_id == TTF_OFF_Windows && name->encoding_id == TTF_OFF_Windows_UCS2)
{
storptr = (char *)font->names.storage + name->offset;
chars = name->length / 2;
bpc = 2;
}
else if (name->platform_id == TTF_OFF_Windows && name->encoding_id == TTF_OFF_Windows_UCS4)
{
storptr = (char *)font->names.storage + name->offset;
chars = name->length / 4;
bpc = 4;
}
else
{
storptr = (char *)font->names.storage + name->offset;
chars = name->length;
bpc = 1;
}
for (tempptr = temp; chars > 0; storptr += bpc, chars --)
{
int ch; // Current character
// Convert to Unicode...
if (bpc == 1)
ch = *storptr;
else if (bpc == 2)
ch = ((storptr[0] & 255) << 8) | (storptr[1] & 255);
else
ch = ((storptr[0] & 255) << 24) | ((storptr[1] & 255) << 16) | ((storptr[2] & 255) << 8) | (storptr[3] & 255);
// Convert to UTF-8...
if (ch < 0x80)
{
// ASCII...
if (tempptr < (temp + sizeof(temp) - 1))
*tempptr++ = (char)ch;
else
break;
}
else if (ch < 0x400)
{
// Two byte UTF-8
if (tempptr < (temp + sizeof(temp) - 2))
{
*tempptr++ = (char)(0xc0 | (ch >> 6));
*tempptr++ = (char)(0x80 | (ch & 0x3f));
}
else
break;
}
else if (ch < 0x10000)
{
// Three byte UTF-8
if (tempptr < (temp + sizeof(temp) - 3))
{
*tempptr++ = (char)(0xe0 | (ch >> 12));
*tempptr++ = (char)(0x80 | ((ch >> 6) & 0x3f));
*tempptr++ = (char)(0x80 | (ch & 0x3f));
}
else
break;
}
else
{
// Four byte UTF-8
if (tempptr < (temp + sizeof(temp) - 4))
{
*tempptr++ = (char)(0xf0 | (ch >> 18));
*tempptr++ = (char)(0x80 | ((ch >> 12) & 0x3f));
*tempptr++ = (char)(0x80 | ((ch >> 6) & 0x3f));
*tempptr++ = (char)(0x80 | (ch & 0x3f));
}
else
break;
}
}
*tempptr = '\0';
TTF_DEBUG("copy_name: name_id(%d) = \"%s\"\n", name_id, temp);
return (strdup(temp));
}