gdttf.c

php-4.4.7学习linux时下载的源代码

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:
 */