genfont.c

嵌入式图形处理系统,emgui嵌入式图形处理系统,

/*
 *  general font
 *
 *
 *  COPYRIGHT (c) 2001 - 2010.
 *  emTech System Corporation.
 *
 *  The license and distribution terms for this file may be
 *  found in found in the file LICENSE.
 */

/*	Huangf [e-mail]
 */

/*	stolen from microwindows & optimize for Chinese
 */
 
/*
 * Copyright (c) 1999, 2000 Greg Haerr <[e-mail]>
 *
 * Screen Driver Utilities
 * 
 * Microwindows Proportional Font Routines (proportional font format)
 *
 * This file contains the generalized low-level font/text
 * drawing routines.  Both fixed and proportional fonts are
 * supported, with fixed pitch structure allowing much smaller
 * font files.
 */
#include <stdio.h>

#include "emGUI.h"
#include "devfont.h"

/* compiled in fonts*/
extern MWCFONT font_rom8x16, font_rom8x8;
extern MWCFONT font_winFreeSansSerif11x13;
extern MWCFONT font_winFreeSystem14x16;
extern MWCFONT font_winSystem14x16;
extern MWCFONT font_winMSSansSerif11x13;
extern MWCFONT font_winTerminal8x12;
extern MWCFONT font_helvB10, font_helvB12, font_helvR10;
extern MWCFONT font_X5x7, font_X6x13;

/* handling routines for MWCOREFONT*/
static MWFONTPROCS fontprocs = {
	MWTF_ASCII,		/* routines expect ascii*/
	(void *)gen_getfontinfo,
	gen_gettextsize,
	gen_gettextbits,
	gen_unloadfont,
	(void *)corefont_drawtext,
	NULL,			/* setfontsize*/
	NULL,			/* setfontrotation*/
	NULL,			/* setfontattr*/
};

/* first font is default font if no match*/
MWCOREFONT gen_fonts[NUMBER_FONTS] = {
#if HAVEMSFONTS
	{&fontprocs, 0, 0, 0, MWFONT_SYSTEM_VAR, &font_winSystem14x16},
	{&fontprocs, 0, 0, 0, MWFONT_GUI_VAR, &font_winMSSansSerif11x13},
	{&fontprocs, 0, 0, 0, MWFONT_OEM_FIXED, &font_winTerminal8x12},
	{&fontprocs, 0, 0, 0, MWFONT_SYSTEM_FIXED, &font_X6x13}
#else
	{&fontprocs, 0, 0, 0, MWFONT_SYSTEM_VAR, &font_winFreeSystem14x16},
	{&fontprocs, 0, 0, 0, MWFONT_GUI_VAR, &font_winFreeSansSerif11x13},
	{&fontprocs, 0, 0, 0, MWFONT_OEM_FIXED, &font_rom8x16},
	{&fontprocs, 0, 0, 0, MWFONT_SYSTEM_FIXED, &font_X6x13}
#endif
};

/*
 * Generalized low level get font info routine.  This
 * routine works with fixed and proportional fonts.
 */
boolean
gen_getfontinfo(PMWFONT pfont, PMWFONTINFO pfontinfo)
{
	PMWCFONT	pf = ((PMWCOREFONT)pfont)->cfont;
	int		i;

	pfontinfo->maxwidth = pf->maxwidth;
	pfontinfo->height = pf->height;
	pfontinfo->baseline = pf->ascent;
	pfontinfo->firstchar = pf->firstchar;
	pfontinfo->lastchar = pf->firstchar + pf->size - 1;
	pfontinfo->fixed = pf->width == NULL? TRUE: FALSE;
	for(i=0; i<256; ++i) {
		if(pf->width == NULL)
			pfontinfo->widths[i] = pf->maxwidth;
		else {
			if(i<pf->firstchar || i >= pf->firstchar+pf->size)
				pfontinfo->widths[i] = 0;
			else pfontinfo->widths[i] = pf->width[i-pf->firstchar];
		}
	}
	return TRUE;
}

/*
 * Generalized low level routine to calc bounding box for text output.
 * Handles both fixed and proportional fonts.  Passed ascii string.
 */
void gen_gettextsize(
	PMWFONT 	pfont, 
	const void *text, 
	int 		cc,
	int 	   *pwidth, 
	int 	   *pheight, 
	int 	   *pbase
)
{
	PMWCFONT pf = ((PMWCOREFONT)pfont)->cfont;
	const unsigned short *str = text;
	unsigned int		c;
	int					width;

	if(pf->width == NULL)
		width = cc * pf->maxwidth;
	else {
		width = 0;

		while(--cc >= 0) {
			c = *str++;

			if (c > 0x7f) {
				width += 12;	/* FIXME*/
			} 
			else{
				if(c >= pf->firstchar && c < pf->firstchar+pf->size)
					width += pf->width[c - pf->firstchar];
			}
		}
	}

	*pwidth 	= width;
	*pheight 	= pf->height;
	*pbase 		= pf->ascent;
}

/*
 * Generalized low level routine to get the bitmap associated
 * with a character.  Handles fixed and proportional fonts.
 */
void gen_gettextbits(
	PMWFONT 	pfont, 
	int 		ch, 
	MWIMAGEBITS *retmap,
	int 		*pwidth, 
	int 		*pheight, 
	int 		*pbase
)
{
	PMWCFONT	pf = ((PMWCOREFONT)pfont)->cfont;
	int 		n, count, width;
	MWIMAGEBITS *	bits;

#if 0
	/* decode chinese gb2312*/
	int CH = ((unsigned int)ch) >> 8, CL = ((unsigned int)ch) & 0xFF;
	if (CH >= 0xA1 && CH < 0xF8 && CL >= 0xA1 && CL < 0xFF) {
	    int Pos = ((CH - 0xA1) * 94 + (CL - 0xA1)) * 18;
	    int i;
	    extern unsigned char GUO_GB2312_12X12_FONT_BITMAP[];

	    *pwidth = width = 12;
	    *pheight = 12;
	    *pbase = 0;

	    for (i = 0; i < 6; i++) {
		unsigned char *DstBitmap  = ((unsigned char *)retmap) + i * 4;
		unsigned char *FontBitmap = GUO_GB2312_12X12_FONT_BITMAP +
			Pos + i * 3;
		DstBitmap[0] = FontBitmap[1];
		DstBitmap[1] = FontBitmap[0];
		DstBitmap[2] = FontBitmap[1] << 4;
		DstBitmap[3] = FontBitmap[2];
	    }
	    return;
	}
#endif

	/* if char not in font, map to first character by default*/
	if(ch < pf->firstchar || ch >= pf->firstchar+pf->size)
		ch = pf->firstchar;

	ch -= pf->firstchar;

	/* get font bitmap depending on fixed pitch or not*/
	bits = pf->bits + (pf->offset? pf->offset[ch]: (pf->height * ch));
	width = pf->width ? pf->width[ch] : pf->maxwidth;
	count = MWIMAGE_WORDS(width) * pf->height;
	for(n=0; n<count; ++n)
		*retmap++ = *bits++;

	/* return width depending on fixed pitch or not*/
	*pwidth = width;
	*pheight = pf->height;
	*pbase = pf->ascent;
}

void gen_unloadfont(
	PMWFONT pfont
)
{
}