crashtest-r0ket/lcd/render.c

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#include <sysdefs.h>
#include <render.h>
#include <fonts.h>
/* Global Variables */
const struct FONT_DEF * font = NULL;
char font_direction = FONT_DIR_LTR;
/* Exported Functions */
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int DoChar(int sx, int sy, char c){
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int x;
int y;
/* "real" coordinates. Our physical display is upside down */
int rx=RESX-sx-1;
int ry=RESY-sy-font->u8Height;
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/* how many bytes is it high? */
char height=(font->u8Height-1)/8+1;
/* Does this font provide this character? */
if(c<font->u8FirstChar || c>font->u8LastChar)
c=font->u8FirstChar+1; // error
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/* starting offset into character source data */
int off,width;
if(font->u8Width==0){
off=font->charInfo[c-font->u8FirstChar].offset;
width=font->charInfo[c-font->u8FirstChar].widthBits;
// width=(font->charInfo[c-font->u8FirstChar].offset-off)/8;
}else{
off=(c-font->u8FirstChar)*font->u8Width*height;
width=font->u8Width;
};
/* raw character data */
int byte;
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unsigned char mask;
/* print forward or backward? */
int dmul=0;
if(font_direction==FONT_DIR_RTL)
dmul=1;
else if (font_direction==FONT_DIR_LTR)
dmul=-1;
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/* break down the position on byte boundaries */
char yidx=ry/8;
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char yoff=ry%8;
/* multiple 8-bit-lines */
for(y=0;y<=height;y++){
mask=255; // XXX: Fixme
if(y==0){
mask=mask>>(yoff);
} else if(y==height){
if(font->u8Height==6)
mask=252;
if(font->u8Height==10)
mask=192;
if(font->u8Height==16)
mask=255;
mask=mask<<(8-yoff);
};
if(font_direction==FONT_DIR_LTR)
flip(mask);
for(x=0;x<font->u8Width;x++){
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unsigned char b1,b2;
if(y==0)
b1=0;
else
b1=font->au8FontTable[off+x*height+y-1];
if(y==height)
b2=0;
else
b2=font->au8FontTable[off+x*height+y];
byte= (b1<<(8-yoff)) | (b2>>yoff);
if(font_direction==FONT_DIR_LTR)
flip(byte);
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buffer[(rx+dmul*x)+(yidx+y)*RESX]&=~mask;
buffer[(rx+dmul*x)+(yidx+y)*RESX]|=byte;
};
};
return sx-dmul*x;
};
int DoString(int sx, int sy, char *s){
char *c;
for(c=s;*c!=0;c++){
sx=DoChar(sx,sy,*c);
};
return sx;
};
int DoInt(int sx, int sy, int num){
#define mxlen 5
char s[(mxlen+1)];
char * o=s;
int len;
s[mxlen]=0;
char neg=0;
if(num<0){
num=-num;
neg=1;
};
for (len=(mxlen-1);len>=0;len--){
s[len]=(num%10)+'0';
if(num==0){
s[len]=' '; // configurable?
o=s+len;
break;
};
num/=10;
};
if(neg)
*o='-';
return DoString(sx,sy,o);
#undef mxlen
};
int DoIntX(int sx, int sy, unsigned int num){
#define mxlen 8
char s[(mxlen+1)];
char * o=s;
int len;
s[mxlen]=0;
for (len=(mxlen-1);len>=0;len--){
s[len]=(num%16)+'0';
if(s[len]>'9')
s[len]+='A'-'9'-1;
if(num==0){
// s[len]=' '; // configurable?
// o=s+len; break;
};
num/=16;
};
return DoString(sx,sy,o);
#undef mxlen
};