font5x7.cpp

一个任天堂掌上游戏机NDS的源代码

/**************************************************************************
* DSemu - The Next Generation                                             *
* 5x7 bitmap font renderer [font5x7.cpp]                                  *
* Copyright Imran Nazar, 2005; released under the BSD public licence.     *
**************************************************************************/

#include <string.h>
#include "datadefs.h"
#include "font5x7.h"
#include "fontdata.h"

int Font5x7::xdim, Font5x7::ydim;
u32 *Font5x7::buf;

// Construct a renderer corresponding to a specific 32-bit framebuffer
Font5x7::Font5x7(u32 *b, int x, int y)
{
    xdim=x; ydim=y; buf=b;
    clear();
}

// Render a character at a certain position, in a 32-bit colour
void Font5x7::chr(u8 c, int x, int y, u32 col)
{
    int off=(x+y*xdim); u8 bits;
    c-=32;

    for(int a=0;a<7;a++)
    {
        bits=font[c][a];
        if(bits&16) buf[off]=col; off++;
        if(bits&8)  buf[off]=col; off++;
        if(bits&4)  buf[off]=col; off++;
        if(bits&2)  buf[off]=col; off++;
        if(bits&1)  buf[off]=col; off+=(xdim-4);
    }
}

// Render a string (parsing newlines) at a certain position
void Font5x7::print(char *str, int x, int y, u32 col)
{
    int xorig=x;
    while(*str)
    {
        switch(*str)
        {
            case 10: y+=8; x=xorig; break;
            default: chr(*str, x, y, col); x+=6; break;
        }
	str++;
    }
}

// Clear the framebuffer to zero's
void Font5x7::clear()
{
    memset(buf, 0, xdim*ydim*sizeof(u32));
}

/*** EOF: font5x7.cpp ****************************************************/