font_hzk.c

一个linux下的根文件系统的源码

    	if(AFont[hzk_id(pf)].pFont == NULL)	/* check font cache*/
	{
		
 		
 		/* Allocate system memory for ASCII font.*/
 		if( !(AFont[hzk_id(pf)].pFont = (char *)malloc(pf->AFont.size)) )
 		{
 		       	printf ("Allocate memory for ASCII HZK font failure.\n");
 		       	free(CFont[hzk_id(pf)].pFont);
 		       	CFont[hzk_id(pf)].pFont = NULL;
			return FALSE;
 		}
 	
	 	/* Load ASCII font information to the near memory.*/
 		printf ("hzk_createfont: loading '%s'\n", pf->AFont.file );
 		if(!(fp = fopen(AFont[hzk_id(pf)].file, "rb"))) 
		{
 		       	printf ("Error.\nThe ASCII HZK font file can not be found!\n");
 		       	return FALSE;
 		}
	 	if(fread(AFont[hzk_id(pf)].pFont, sizeof(char), pf->AFont.size, fp) < pf->AFont.size) 
		{
 		       	printf ("Error in reading ASCII HZK font file!\n");
 		       	fclose(fp);
 		       	return FALSE;
	 	}
 	
 		fclose(fp);
 	
		AFont[hzk_id(pf)].use_count=0;

  	}
	afont_address = AFont[hzk_id(pf)].pFont;
	pf->afont_address = AFont[hzk_id(pf)].pFont;
	pf->AFont.pFont = AFont[hzk_id(pf)].pFont;

	AFont[hzk_id(pf)].use_count++;

  	return TRUE;
}

/* This function unload system font from memory.*/
static void UnloadFont( PMWHZKFONT pf )
{
	CFont[hzk_id(pf)].use_count--;
	AFont[hzk_id(pf)].use_count--;

	if (!CFont[hzk_id(pf)].use_count)
	{	
	    	free(pf->CFont.pFont);
	    	free(pf->AFont.pFont);

	    	CFont[hzk_id(pf)].pFont = NULL;
	    	AFont[hzk_id(pf)].pFont = NULL;
	}
}

int
hzk_init(PSD psd)
{
	/* FIXME: *.KU file should be opened and
	 * read in here...*/
	return 1;
}

PMWHZKFONT
hzk_createfont(const char *name, MWCOORD height, int attr)
{
	PMWHZKFONT	pf;

	if(strcmp(name,"HZKFONT")!=0 && strcmp(name,"HZXFONT")!=0)
		return FALSE;

	/*printf("hzk_createfont(%s,%d)\n",name,height);*/

	use_big5=name[2]-'K';

	/* allocate font structure*/
	pf = (PMWHZKFONT)calloc(sizeof(MWHZKFONT), 1);
	if (!pf)
		return NULL;
	pf->fontprocs = &hzk_procs;

	pf->fontsize = height;
	pf->fontrotation = 0;
	pf->fontattr = attr;

	if(height==12)
	{		
		afont_width = 6;
		cfont_width = 12;
		font_height = 12;

		pf->afont_width = 6;
		pf->cfont_width = 12;
		pf->font_height = 12;
	}
	else 	
	{		
		afont_width = 8;
		cfont_width = 16;
		font_height = 16;

		pf->afont_width = 8;
		pf->cfont_width = 16;
		pf->font_height = 16;
	}

    	/* Load the font library to the system memory.*/
	if(!LoadFont(pf))
  	      	return FALSE;

	return pf;
}

int IsBig5(int i)
{
	if ((i>=0xa140 && i<=0xa3bf) || /* a140-a3bf(!a3e0) */
	    (i>=0xa440 && i<=0xc67e) || /* a440-c67e        */
	    (i>=0xc6a1 && i<=0xc8d3) || /* c6a1-c8d3(!c8fe) */
	    (i>=0xc940 && i<=0xf9fe))   /* c940-f9fe        */
		return 1;
	else
		return 0;
}

/*
 * following several function is used in hzk_drawtext
 */

static int getnextchar(char* s, unsigned char* cc)
{
    	if( s[0] == '\0') return 0;

    	cc[0] = (unsigned char)(*s);
    	cc[1] = (unsigned char)(*(s + 1));

    	if (use_big5)
    	{
		if( IsBig5( (int) ( (cc[0] << 8) + cc[1]) ) )
			return 1;
    	}
    	else
	{
    		if( ((unsigned char)cc[0] > 0xa0) &&
		    ((unsigned char)cc[1] > 0xa0) )
        		return 1;
	}

    	cc[1] = '\0';

    	return 1;
}

static void
expandcchar(PMWHZKFONT pf, int bg, int fg, unsigned char* c, MWPIXELVAL* bitmap)
{
	int i=0;
    	int c1, c2, seq;
	int x,y;
    	unsigned char *font;
    	int b = 0;		/* keep gcc happy with b = 0 - MW */

	int pixelsize;
	pixelsize=sizeof(MWPIXELVAL);

   	c1 = c[0];
    	c2 = c[1];
	if (use_big5)
	{
		seq=0;
		/* ladd=loby-(if(loby<127)?64:98)*/
		c2-=(c2<127?64:98);   

		/* hadd=(hiby-164)*157*/
		if (c1>=0xa4)	/* standard font*/
		{
			seq=(((c1-164)*157)+c2);
			if (seq>=5809) seq-=408;
		}

		/* hadd=(hiby-161)*157*/
		if (c1<=0xa3)	/* special font*/
			seq=(((c1-161)*157)+c2)+13094;
	}
	else
    		seq=((c1 - 161)*94 + c2 - 161); 

	font = pf->cfont_address + ((seq) *
		  (pf->font_height * ((pf->cfont_width + 7) / 8)));

     	for (y = 0; y < pf->font_height; y++)
        	for (x = 0; x < pf->cfont_width; x++) 
		{
            		if (x % 8 == 0)
                		b = *font++;

            		if (b & (128 >> (x % 8)))   /* pixel */
			  	bitmap[i++]=fg;
			else
				bitmap[i++]=bg;
		}		
}

static void expandchar(PMWHZKFONT pf, int bg, int fg, int c, MWPIXELVAL* bitmap)
{
	int i=0;
	int x,y;
    	unsigned char *font;
	int pixelsize;
    	int b = 0;		/* keep gcc happy with b = 0 - MW */

	pixelsize=sizeof(MWPIXELVAL);

    	font = pf->afont_address + c * (pf->font_height *
		((pf->afont_width + 7) / 8));

  	for (y = 0; y < pf->font_height; y++)
		for (x = 0; x < pf->afont_width; x++) 
		{
	    		if (x % 8 == 0)
				b = *font++;
	    		if (b & (128 >> (x % 8)))	/* pixel */
				bitmap[i++]=fg;
			else
				bitmap[i++]=bg;
  		}
}

/*
 * Draw ASCII text string using HZK type font
 */
static void
hzk_drawtext(PMWFONT pfont, PSD psd, MWCOORD ax, MWCOORD ay,
	const void *text, int cc, MWTEXTFLAGS flags)
{
	PMWHZKFONT pf=(PMWHZKFONT)pfont;

    	unsigned char c[2];
	MWPIXELVAL *bitmap;
    	unsigned char s1[3];
 	char *s,*sbegin;

	s=(char *)text;

	if(cc==1)
	{
		s1[0]=*((unsigned char*)text);
		s1[1]=0x0;
		s1[2]=0x0;
		s=s1;
    	}

	sbegin=s;
    	bitmap = (MWPIXELVAL *)ALLOCA(pf->cfont_width * pf->font_height *
			sizeof(MWPIXELVAL));

    	while( getnextchar(s, c) )
	{
              	if( c[1] != '\0') 
		{
                	expandcchar(pf, gr_background,gr_foreground,
                            c, bitmap);
			/* Now draw the bitmap ... */
			
			if (flags&MWTF_TOP)
				GdArea(psd,ax, ay, pf->cfont_width,
					pf->font_height, bitmap, MWPF_PIXELVAL);
			else
				GdArea(psd,ax, ay-pf->font_height+2,
					pf->cfont_width, pf->font_height,
					bitmap, MWPF_PIXELVAL);

                	s += 2;
                	ax += pf->cfont_width;
            	}
            	else 
		{
                	expandchar(pf, gr_background,gr_foreground,
                           c[0], bitmap);
			/* Now draw the bitmap ... */

			if (flags&MWTF_TOP) 
				GdArea(psd,ax, ay, pf->afont_width,
					pf->font_height, bitmap, MWPF_PIXELVAL);
			else
				GdArea(psd,ax, ay-pf->font_height+2,
					pf->afont_width, pf->font_height,
					bitmap, MWPF_PIXELVAL);

                	s += 1;
                	ax += pf->afont_width;
            	}
						
		if(s>=sbegin+cc)break;
    	}

	FREEA(bitmap);
}

/*
 * Return information about a specified font.
 */
static MWBOOL
hzk_getfontinfo(PMWFONT pfont, PMWFONTINFO pfontinfo)
{
	PMWHZKFONT pf=(PMWHZKFONT)pfont;

	int i;

	pfontinfo->height = pf->font_height;
	pfontinfo->maxwidth = pf->cfont_width;
	pfontinfo->baseline = pf->font_height - 2;

	/* FIXME: calculate these properly: */
	pfontinfo->linespacing = pfontinfo->height;
	pfontinfo->descent = pfontinfo->height - pfontinfo->baseline;
	pfontinfo->maxascent = pfontinfo->baseline;
	pfontinfo->maxdescent = pfontinfo->descent;

	pfontinfo->firstchar = 0;
	pfontinfo->lastchar = 0;
	pfontinfo->fixed = TRUE;
		
	for(i=0; i<=256; i++)
		pfontinfo->widths[i] = pf->afont_width;

	return TRUE;
}

static void
hzk_gettextsize(PMWFONT pfont, const void *text, int cc, MWTEXTFLAGS flags,
	MWCOORD *pwidth, MWCOORD *pheight, MWCOORD *pbase)
{
	PMWHZKFONT pf=(PMWHZKFONT)pfont;

   	unsigned char c[2];
 	char *s,*sbegin;
    	unsigned char s1[3];

	int ax=0;
	s=(char *)text;
	if(cc==0)
	{
		*pwidth = 0;
		*pheight = pf->font_height;
		*pbase = pf->font_height-2;

	}
	if(cc==1)
	{
		s1[0]=*((unsigned char*)text);
		s1[1]=0x0;
		s1[2]=0x0;
		s=s1;
    	}
	sbegin=s;
    	while( getnextchar(s, c) )
	{
		if( c[1] != '\0') 
		{
           		s += 2;
           		ax += pf->cfont_width;
        	}
        	else 
		{
           		s += 1;
           		ax += pf->afont_width;
        	}
		if(s>=sbegin+cc) {
			/*printf("s=%x,sbegin=%x,cc=%x\n",s,sbegin,cc);*/
			break;
		}

    	}
	/*printf("ax=%d,\n",ax);*/

	*pwidth = ax;
	*pheight = pf->font_height;
	*pbase = pf->font_height-2;
}

static void
hzk_destroyfont(PMWFONT pfont)
{
	PMWHZKFONT pf=(PMWHZKFONT)pfont;
	UnloadFont(pf);
	free(pf);
}