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php-src/ext/gd/gdttf.c
foobar a139dbf9cc - Fix outside-source-tree builds. Always include generated header files 
with #include <some_header.h> to make sure the correct file is used.
2005-01-09 21:05:06 +00:00

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/* gd interface to freetype library */
/* */
/* John Ellson ellson@lucent.com */
/* $Id$ */
#include "php.h"
#if PHP_WIN32
#include "config.w32.h"
#else
#include <php_config.h>
#endif
#if HAVE_LIBTTF && !defined(USE_GD_IMGSTRTTF)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <gd.h>
#include "gdttf.h"
#include "gdcache.h"
#include <freetype.h>
#ifndef HAVE_GDIMAGECOLORRESOLVE
extern int gdImageColorResolve(gdImagePtr, int, int, int);
#endif
/* number of fonts cached before least recently used is replaced */
#define FONTCACHESIZE 6
/* number of character glyphs cached per font before
least-recently-used is replaced */
#define GLYPHCACHESIZE 120
/* number of bitmaps cached per glyph before
least-recently-used is replaced */
#define BITMAPCACHESIZE 8
/* number of antialias color lookups cached */
#define TWEENCOLORCACHESIZE 32
/* ptsize below which anti-aliasing is ineffective */
#define MINANTIALIASPTSIZE 0
/* display resolution - (Not really. This has to be 72 or hinting is wrong) */
#define RESOLUTION 72
/* Number of colors used for anti-aliasing */
#undef NUMCOLORS
#define NUMCOLORS 4
/* Line separation as a factor of font height.
No space between if LINESPACE = 1.00
Line separation will be rounded up to next pixel row*/
#define LINESPACE 1.05
#ifndef TRUE
#define FALSE 0
#define TRUE !FALSE
#endif
#ifndef MAX
#define MAX(a, b) ((a)>(b)?(a):(b))
#endif
#ifndef MIN
#define MIN(a, b) ((a)<(b)?(a):(b))
#endif
typedef struct {
char *fontname; /* key */
double ptsize; /* key */
double angle; /* key */
double sin_a, cos_a;
TT_Engine *engine;
TT_Face face;
TT_Face_Properties properties;
TT_Instance instance;
TT_CharMap char_map_Unicode;
TT_CharMap char_map_Big5;
TT_CharMap char_map_Roman;
int have_char_map_Unicode;
int have_char_map_Big5;
int have_char_map_Roman;
TT_Matrix matrix;
TT_Instance_Metrics imetrics;
gdCache_head_t *glyphCache;
} font_t;
typedef struct {
char *fontname; /* key */
double ptsize; /* key */
double angle; /* key */
TT_Engine *engine;
} fontkey_t;
typedef struct {
int character; /* key */
int hinting; /* key */
TT_Glyph glyph;
TT_Glyph_Metrics metrics;
TT_Outline outline;
TT_Pos oldx, oldy;
TT_Raster_Map Bit;
int gray_render;
int xmin, xmax, ymin, ymax;
gdCache_head_t *bitmapCache;
} glyph_t;
typedef struct {
int character; /* key */
int hinting; /* key */
int gray_render;
font_t *font;
} glyphkey_t;
typedef struct {
int xoffset; /* key */
int yoffset; /* key */
char *bitmap;
} bitmap_t;
typedef struct {
int xoffset; /* key */
int yoffset; /* key */
glyph_t *glyph;
} bitmapkey_t;
typedef struct {
unsigned char pixel; /* key */
unsigned char bgcolor; /* key */
int fgcolor; /* key */ /* -ve means no antialias */
gdImagePtr im; /* key */
unsigned char tweencolor;
} tweencolor_t;
typedef struct {
unsigned char pixel; /* key */
unsigned char bgcolor; /* key */
int fgcolor; /* key */ /* -ve means no antialias */
gdImagePtr im; /* key */
} tweencolorkey_t;
/* forward declarations so that glyphCache can be initialized by font code */
static int glyphTest ( void *element, void *key );
static void *glyphFetch ( char **error, void *key );
static void glyphRelease( void *element );
/* forward declarations so that bitmapCache can be initialized by glyph code */
static int bitmapTest ( void *element, void *key );
static void *bitmapFetch ( char **error, void *key );
static void bitmapRelease( void *element );
/* local prototype */
char *gdttfchar(gdImage *im, int fg, font_t *font, int x, int y, TT_F26Dot6 x1, TT_F26Dot6 y1, TT_F26Dot6 *advance, TT_BBox **bbox, char **next);
/********************************************************************
* gdTcl_UtfToUniChar is borrowed from ...
*/
/*
* tclUtf.c --
*
* Routines for manipulating UTF-8 strings.
*
* Copyright (c) 1997-1998 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tclUtf.c 1.25 98/01/28 18:02:43
*/
/*
*---------------------------------------------------------------------------
*
* gdTcl_UtfToUniChar --
*
* Extract the Tcl_UniChar represented by the UTF-8 string. Bad
* UTF-8 sequences are converted to valid Tcl_UniChars and processing
* continues. Equivalent to Plan 9 chartorune().
*
* The caller must ensure that the source buffer is long enough that
* this routine does not run off the end and dereference non-existent
* memory looking for trail bytes. If the source buffer is known to
* be '\0' terminated, this cannot happen. Otherwise, the caller
* should call Tcl_UtfCharComplete() before calling this routine to
* ensure that enough bytes remain in the string.
*
* Results:
* *chPtr is filled with the Tcl_UniChar, and the return value is the
* number of bytes from the UTF-8 string that were consumed.
*
* Side effects:
* None.
*
*---------------------------------------------------------------------------
*/
#ifndef CHARSET_EBCDIC
#define ASC(ch) (ch)
#else /*CHARSET_EBCDIC*/
#define ASC(ch) os_toascii[(unsigned char) (ch)]
#endif /*CHARSET_EBCDIC*/
#define Tcl_UniChar int
#define TCL_UTF_MAX 3
static int gdTcl_UtfToUniChar(char *str, Tcl_UniChar *chPtr)
/* str is the UTF8 next character pointer */
/* chPtr is the int for the result */
{
int byte;
/* HTML4.0 entities in decimal form, e.g. &#197; */
byte = *((unsigned char *) str);
if (byte == '&') {
int i, n = 0;
byte = *((unsigned char *) (str+1));
if (byte == '#') {
for (i = 2; i < 8; i++) {
byte = *((unsigned char *) (str+i));
if (byte >= '0' && byte <= '9') {
n = (n * 10) + (byte - '0');
} else {
break;
}
}
if (byte == ';') {
*chPtr = (Tcl_UniChar) n;
return ++i;
}
}
}
/* Unroll 1 to 3 byte UTF-8 sequences, use loop to handle longer ones. */
byte = ASC(*((unsigned char *) str));
if (byte < 0xC0) {
/*
* Handles properly formed UTF-8 characters between 0x01 and 0x7F.
* Also treats \0 and naked trail bytes 0x80 to 0xBF as valid
* characters representing themselves.
*/
*chPtr = (Tcl_UniChar) byte;
return 1;
} else if (byte < 0xE0) {
if ((ASC(str[1]) & 0xC0) == 0x80) {
/* Two-byte-character lead-byte followed by a trail-byte. */
*chPtr = (Tcl_UniChar) (((byte & 0x1F) << 6) | (ASC(str[1]) & 0x3F));
return 2;
}
/*
* A two-byte-character lead-byte not followed by trail-byte
* represents itself.
*/
*chPtr = (Tcl_UniChar) byte;
return 1;
} else if (byte < 0xF0) {
if (((ASC(str[1]) & 0xC0) == 0x80) && ((ASC(str[2]) & 0xC0) == 0x80)) {
/* Three-byte-character lead byte followed by two trail bytes. */
*chPtr = (Tcl_UniChar) (((byte & 0x0F) << 12) | ((ASC(str[1]) & 0x3F) << 6) | (ASC(str[2]) & 0x3F));
return 3;
}
/* A three-byte-character lead-byte not followed by two trail-bytes represents itself. */
*chPtr = (Tcl_UniChar) byte;
return 1;
}
#if TCL_UTF_MAX > 3
else {
int ch, total, trail;
total = totalBytes[byte];
trail = total - 1;
if (trail > 0) {
ch = byte & (0x3F >> trail);
do {
str++;
if ((ASC(*str) & 0xC0) != 0x80) {
*chPtr = byte;
return 1;
}
ch <<= 6;
ch |= (ASC(*str) & 0x3F);
trail--;
} while (trail > 0);
*chPtr = ch;
return total;
}
}
#endif
*chPtr = (Tcl_UniChar) byte;
return 1;
}
/********************************************************************/
/* font cache functions */
static int fontTest ( void *element, void *key )
{
font_t *a = (font_t *)element;
fontkey_t *b = (fontkey_t *)key;
return (strcmp(a->fontname, b->fontname) == 0 && a->ptsize == b->ptsize && a->angle == b->angle);
}
static void * fontFetch ( char **error, void *key )
{
TT_Error err;
font_t *a;
fontkey_t *b = (fontkey_t *)key;
int i, n, map_found;
short platform, encoding;
TSRMLS_FETCH();
a = (font_t *)pemalloc(sizeof(font_t), 1);
#ifdef VIRTUAL_DIR
/* a->fontname will be freed in fontRelease() later on */
if (virtual_filepath(b->fontname, &a->fontname TSRMLS_CC)) {
*error = "Could not find/open font";
pefree(a, 1);
return NULL;
}
#else
a->fontname = (char *)pemalloc(strlen(b->fontname) + 1, 1);
strcpy(a->fontname, b->fontname);
#endif
a->ptsize = b->ptsize;
a->angle = b->angle;
a->sin_a = sin(a->angle);
a->cos_a = cos(a->angle);
a->engine = b->engine;
if ((err = TT_Open_Face(*b->engine, a->fontname, &a->face))) {
if (err == TT_Err_Could_Not_Open_File) {
*error = "Could not find/open font";
} else {
*error = "Could not read font";
}
pefree(a, 1);
return NULL;
}
/* get face properties and allocate preload arrays */
TT_Get_Face_Properties(a->face, &a->properties);
/* create instance */
if (TT_New_Instance(a->face, &a->instance)) {
*error = "Could not create face instance";
pefree(a, 1);
return NULL;
}
if (TT_Set_Instance_Resolutions(a->instance, RESOLUTION, RESOLUTION)) {
*error = "Could not set device resolutions";
pefree(a, 1);
return NULL;
}
if (TT_Set_Instance_CharSize(a->instance, (TT_F26Dot6)(a->ptsize*64))) {
*error = "Could not set character size";
pefree(a, 1);
return NULL;
}
TT_Get_Instance_Metrics(a->instance, &a->imetrics);
/* First, look for a Unicode charmap */
n = TT_Get_CharMap_Count(a->face);
for (i = 0; i < n; i++) {
TT_Get_CharMap_ID(a->face, i, &platform, &encoding);
if ((platform == 3 && encoding == 1) /* Windows Unicode */
|| (platform == 2 && encoding == 1)
|| (platform == 0)) { /* ?? Unicode */
TT_Get_CharMap(a->face, i, &a->char_map_Unicode);
a->have_char_map_Unicode = 1;
map_found++;
} else if (platform == 3 && encoding == 4) { /* Windows Big5 */
TT_Get_CharMap(a->face, i, &a->char_map_Big5);
a->have_char_map_Big5 = 1;
map_found++;
} else if (platform == 1 && encoding == 0) { /* Apple Roman */
TT_Get_CharMap(a->face, i, &a->char_map_Roman);
a->have_char_map_Roman = 1;
map_found++;
}
}
if (!map_found) {
*error = "Unable to find a CharMap that I can handle";
pefree(a, 1);
return NULL;
}
a->matrix.xx = (TT_Fixed) (a->cos_a * (1<<16));
a->matrix.yx = (TT_Fixed) (a->sin_a * (1<<16));
a->matrix.xy = - a->matrix.yx;
a->matrix.yy = a->matrix.xx;
a->glyphCache = gdCacheCreate(GLYPHCACHESIZE, glyphTest, glyphFetch, glyphRelease);
return (void *)a;
}
static void fontRelease( void *element )
{
font_t *a = (font_t *)element;
gdCacheDelete(a->glyphCache);
TT_Done_Instance(a->instance);
TT_Close_Face(a->face);
pefree(a->fontname, 1);
pefree((char *)element, 1);
}
/********************************************************************/
/* glyph cache functions */
static int glyphTest ( void *element, void *key )
{
glyph_t *a = (glyph_t *)element;
glyphkey_t *b = (glyphkey_t *)key;
return (a->character == b->character && a->hinting == b->hinting && a->gray_render == b->gray_render);
}
static void * glyphFetch ( char **error, void *key )
{
glyph_t *a;
glyphkey_t *b = (glyphkey_t *)key;
short glyph_code;
int flags, err;
int crect[8], xmin, xmax, ymin, ymax;
double cos_a, sin_a;
a = (glyph_t *)pemalloc(sizeof(glyph_t), 1);
a->character = b->character;
a->hinting = b->hinting;
a->gray_render = b->gray_render;
a->oldx = a->oldy = 0;
/* create glyph container */
if ((TT_New_Glyph(b->font->face, &a->glyph))) {
*error = "Could not create glyph container";
pefree(a, 1);
return NULL;
}
flags = TTLOAD_SCALE_GLYPH;
if (a->hinting && b->font->angle == 0.0) {
flags |= TTLOAD_HINT_GLYPH;
}
if (b->font->have_char_map_Unicode) {
glyph_code = TT_Char_Index(b->font->char_map_Unicode, a->character);
} else if (a->character < 161 && b->font->have_char_map_Roman) {
glyph_code = TT_Char_Index(b->font->char_map_Roman, a->character);
} else if ( b->font->have_char_map_Big5) {
glyph_code = TT_Char_Index(b->font->char_map_Big5, a->character);
}
if ((err=TT_Load_Glyph(b->font->instance, a->glyph, glyph_code, flags))) {
*error = "TT_Load_Glyph problem";
pefree(a, 1);
return NULL;
}
TT_Get_Glyph_Metrics(a->glyph, &a->metrics);
if (b->font->angle != 0.0) {
TT_Get_Glyph_Outline(a->glyph, &a->outline);
TT_Transform_Outline(&a->outline, &b->font->matrix);
}
/* calculate bitmap size */
xmin = a->metrics.bbox.xMin -64;
ymin = a->metrics.bbox.yMin -64;
xmax = a->metrics.bbox.xMax +64;
ymax = a->metrics.bbox.yMax +64;
cos_a = b->font->cos_a;
sin_a = b->font->sin_a;
crect[0] = (int)(xmin * cos_a - ymin * sin_a);
crect[1] = (int)(xmin * sin_a + ymin * cos_a);
crect[2] = (int)(xmax * cos_a - ymin * sin_a);
crect[3] = (int)(xmax * sin_a + ymin * cos_a);
crect[4] = (int)(xmax * cos_a - ymax * sin_a);
crect[5] = (int)(xmax * sin_a + ymax * cos_a);
crect[6] = (int)(xmin * cos_a - ymax * sin_a);
crect[7] = (int)(xmin * sin_a + ymax * cos_a);
a->xmin = MIN(MIN(crect[0], crect[2]), MIN(crect[4], crect[6]));
a->xmax = MAX(MAX(crect[0], crect[2]), MAX(crect[4], crect[6]));
a->ymin = MIN(MIN(crect[1], crect[3]), MIN(crect[5], crect[7]));
a->ymax = MAX(MAX(crect[1], crect[3]), MAX(crect[5], crect[7]));
/* allocate bitmap large enough for character */
a->Bit.rows = (a->ymax - a->ymin + 32 + 64) / 64;
a->Bit.width = (a->xmax - a->xmin + 32 + 64) / 64;
a->Bit.flow = TT_Flow_Up;
if (a->gray_render) {
a->Bit.cols = a->Bit.width; /* 1 byte per pixel */
} else {
a->Bit.cols = (a->Bit.width + 7) / 8; /* 1 bit per pixel */
}
a->Bit.cols = (a->Bit.cols + 3) & ~3; /* pad to 32 bits */
a->Bit.size = a->Bit.rows * a->Bit.cols; /* # of bytes in buffer */
a->Bit.bitmap = NULL;
a->bitmapCache = gdCacheCreate(BITMAPCACHESIZE, bitmapTest, bitmapFetch, bitmapRelease);
return (void *)a;
}
static void glyphRelease( void *element )
{
glyph_t *a = (glyph_t *)element;
gdCacheDelete(a->bitmapCache);
TT_Done_Glyph(a->glyph);
pefree((char *)element, 1);
}
/********************************************************************/
/* bitmap cache functions */
static int bitmapTest ( void *element, void *key )
{
bitmap_t *a = (bitmap_t *)element;
bitmapkey_t *b = (bitmapkey_t *)key;
if (a->xoffset == b->xoffset && a->yoffset == b->yoffset) {
b->glyph->Bit.bitmap = a->bitmap;
return TRUE;
}
return FALSE;
}
static void * bitmapFetch ( char **error, void *key )
{
bitmap_t *a;
bitmapkey_t *b = (bitmapkey_t *)key;
a = (bitmap_t *)pemalloc(sizeof(bitmap_t), 1);
a->xoffset = b->xoffset;
a->yoffset = b->yoffset;
b->glyph->Bit.bitmap = a->bitmap = (char *)pemalloc(b->glyph->Bit.size, 1);
memset(a->bitmap, 0, b->glyph->Bit.size);
/* render glyph */
if (b->glyph->gray_render) {
TT_Get_Glyph_Pixmap(b->glyph->glyph, &b->glyph->Bit, a->xoffset, a->yoffset);
} else {
TT_Get_Glyph_Bitmap(b->glyph->glyph, &b->glyph->Bit, a->xoffset, a->yoffset);
}
return (void *)a;
}
static void bitmapRelease( void *element )
{
bitmap_t *a = (bitmap_t *)element;
pefree(a->bitmap, 1);
pefree((char *)element, 1);
}
/********************************************************************/
/* tweencolor cache functions */
static int tweenColorTest (void *element, void *key)
{
tweencolor_t *a = (tweencolor_t *)element;
tweencolorkey_t *b = (tweencolorkey_t *)key;
return (a->pixel == b->pixel && a->bgcolor == b->bgcolor && a->fgcolor == b->fgcolor && a->im == b->im);
}
static void * tweenColorFetch (char **error, void *key)
{
tweencolor_t *a;
tweencolorkey_t *b = (tweencolorkey_t *)key;
int pixel, npixel, bg, fg;
gdImagePtr im;
a = (tweencolor_t *)pemalloc(sizeof(tweencolor_t), 1);
pixel = a->pixel = b->pixel;
bg = a->bgcolor = b->bgcolor;
fg = a->fgcolor = b->fgcolor;
im = b->im;
/* if fg is specified by a negative color idx, then don't antialias */
if (fg < 0) {
a->tweencolor = -fg;
} else {
npixel = NUMCOLORS - pixel;
a->tweencolor = gdImageColorResolve(im,
(pixel * im->red [fg] + npixel * im->red [bg]) / NUMCOLORS,
(pixel * im->green[fg] + npixel * im->green[bg]) / NUMCOLORS,
(pixel * im->blue [fg] + npixel * im->blue [bg]) / NUMCOLORS);
}
*error = NULL;
return (void *)a;
}
static void tweenColorRelease(void *element)
{
pefree((char *)element, 1);
}
/********************************************************************/
/* gdttfchar - render one character onto a gd image */
static int OneTime = 0;
static gdCache_head_t *tweenColorCache;
char *
gdttfchar(gdImage *im, int fg, font_t *font,
int x, int y, /* string start pos in pixels */
TT_F26Dot6 x1, TT_F26Dot6 y1, /* char start offset (*64) from x,y */
TT_F26Dot6 *advance,
TT_BBox **bbox,
char **next)
{
int pc, ch, len;
int row, col;
int x2, y2; /* char start pos in pixels */
int x3, y3; /* current pixel pos */
unsigned char *pixel;
glyph_t *glyph;
glyphkey_t glyphkey;
bitmapkey_t bitmapkey;
tweencolor_t *tweencolor;
tweencolorkey_t tweencolorkey;
/****** set up tweenColorCache on first call ************/
if (!OneTime) {
tweenColorCache = gdCacheCreate(TWEENCOLORCACHESIZE, tweenColorTest, tweenColorFetch, tweenColorRelease);
OneTime++;
}
/**************/
if (font->have_char_map_Unicode) { /* use UTF-8 mapping from ASCII */
len = gdTcl_UtfToUniChar(*next, &ch);
*next += len;
} else {
/*
* Big 5 mapping:
* use "JIS-8 half-width katakana" coding from 8-bit characters. Ref:
* ftp://ftp.ora.com/pub/examples/nutshell/ujip/doc/japan.inf-032092.sjs
*/
ch = (**next) & 255; /* don't extend sign */
(*next)++;
if (ch >= 161 /* first code of JIS-8 pair */
&& **next) { /* don't advance past '\0' */
ch = (ch * 256) + **next;
(*next)++;
}
}
glyphkey.character = ch;
glyphkey.hinting = 1;
/* if fg is specified by a negative color idx, then don't antialias */
glyphkey.gray_render = ((font->ptsize < MINANTIALIASPTSIZE) || (fg < 0)) ? FALSE : TRUE;
glyphkey.font = font;
glyph = (glyph_t *)gdCacheGet(font->glyphCache, &glyphkey);
if (!glyph) {
return font->glyphCache->error;
}
*bbox = &glyph->metrics.bbox;
*advance = glyph->metrics.advance;
/* if null *im, or invalid color, then assume user just wants brect */
if (!im || fg > 255 || fg < -255) {
return (char *)NULL;
}
/* render (via cache) a bitmap for the current fractional offset */
bitmapkey.xoffset = ((x1+32) & 63) - 32 - ((glyph->xmin+32) & -64);
bitmapkey.yoffset = ((y1+32) & 63) - 32 - ((glyph->ymin+32) & -64);
bitmapkey.glyph = glyph;
gdCacheGet(glyph->bitmapCache, &bitmapkey);
/* copy to gif, mapping colors */
x2 = x + (((glyph->xmin+32) & -64) + ((x1+32) & -64)) / 64;
y2 = y - (((glyph->ymin+32) & -64) + ((y1+32) & -64)) / 64;
tweencolorkey.fgcolor = fg;
tweencolorkey.im = im;
for (row = 0; row < glyph->Bit.rows; row++) {
if (glyph->gray_render) {
pc = row * glyph->Bit.cols;
} else {
pc = row * glyph->Bit.cols * 8;
}
y3 = y2 - row;
if (y3 >= im->sy || y3 < 0) {
continue;
}
for (col = 0; col < glyph->Bit.width; col++, pc++) {
if (glyph->gray_render) {
tweencolorkey.pixel = *((unsigned char *)(glyph->Bit.bitmap) + pc);
} else {
tweencolorkey.pixel = (((*((unsigned char *)(glyph->Bit.bitmap) + pc/8)) << (pc%8))&128)?4:0;
}
/* if not background */
if (tweencolorkey.pixel > 0) {
x3 = x2 + col;
if (x3 >= im->sx || x3 < 0) {
continue;
}
#if HAVE_LIBGD20
if (im->trueColor) {
pixel = &im->tpixels[y3][x3];
} else
#endif
{
#if HAVE_LIBGD13
pixel = &im->pixels[y3][x3];
#else
pixel = &im->pixels[x3][y3];
#endif
}
tweencolorkey.bgcolor = *pixel;
tweencolor = (tweencolor_t *)gdCacheGet(tweenColorCache, &tweencolorkey);
*pixel = tweencolor->tweencolor;
}
}
}
return (char *)NULL;
}
/********************************************************************/
/* gdttf - render a utf8 string onto a gd image */
char * gdttf(gdImage *im, int *brect, int fg, char *fontname, double ptsize, double angle, int x, int y, char *str)
{
TT_F26Dot6 ur_x = 0, ur_y = 0, ll_x = 0, ll_y = 0;
TT_F26Dot6 advance_x, advance_y, advance, x1, y1;
TT_BBox *bbox;
double sin_a, cos_a;
int i=0, ch;
font_t *font;
fontkey_t fontkey;
char *error, *next;
/****** initialize font engine on first call ************/
static gdCache_head_t *fontCache;
static TT_Engine engine;
if (!fontCache) {
if (TT_Init_FreeType(&engine)) {
return "Failure to initialize font engine";
}
fontCache = gdCacheCreate(FONTCACHESIZE, fontTest, fontFetch, fontRelease);
}
/**************/
/* get the font (via font cache) */
fontkey.fontname = fontname;
fontkey.ptsize = ptsize;
fontkey.angle = angle;
fontkey.engine = &engine;
font = (font_t *)gdCacheGet(fontCache, &fontkey);
if (!font) {
return fontCache->error;
}
sin_a = font->sin_a;
cos_a = font->cos_a;
advance_x = advance_y = 0;
next = str;
while (*next) {
ch = *next;
/* carriage returns */
if (ch == '\r') {
advance_x = 0;
next++;
continue;
}
/* newlines */
if (ch == '\n') {
advance_y -= (TT_F26Dot6)(font->imetrics.y_ppem * LINESPACE * 64);
advance_y = (advance_y-32) & -64; /* round to next pixel row */
next++;
continue;
}
x1 = (TT_F26Dot6)(advance_x * cos_a - advance_y * sin_a);
y1 = (TT_F26Dot6)(advance_x * sin_a + advance_y * cos_a);
if ((error = gdttfchar(im, fg, font, x, y, x1, y1, &advance, &bbox, &next))) {
return error;
}
if (!i++) { /* if first character, init BB corner values */
ll_x = bbox->xMin;
ll_y = bbox->yMin;
ur_x = bbox->xMax;
ur_y = bbox->yMax;
} else {
if (!advance_x) {
ll_x = MIN(bbox->xMin, ll_x);
}
ll_y = MIN(advance_y + bbox->yMin, ll_y);
ur_x = MAX(advance_x + bbox->xMax, ur_x);
if (!advance_y) {
ur_y = MAX(bbox->yMax, ur_y);
}
}
advance_x += advance;
}
/* rotate bounding rectangle */
brect[0] = (int)(ll_x * cos_a - ll_y * sin_a);
brect[1] = (int)(ll_x * sin_a + ll_y * cos_a);
brect[2] = (int)(ur_x * cos_a - ll_y * sin_a);
brect[3] = (int)(ur_x * sin_a + ll_y * cos_a);
brect[4] = (int)(ur_x * cos_a - ur_y * sin_a);
brect[5] = (int)(ur_x * sin_a + ur_y * cos_a);
brect[6] = (int)(ll_x * cos_a - ur_y * sin_a);
brect[7] = (int)(ll_x * sin_a + ur_y * cos_a);
/* scale, round and offset brect */
i = 0;
while (i < 8) {
brect[i] = x + (brect[i] + 32) / 64;
i++;
brect[i] = y - (brect[i] + 32) / 64;
i++;
}
return (char *)NULL;
}
#endif /* HAVE_LIBTTF */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
*/
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