61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
#define PIXEL_C
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#include "config.h"
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#include "pixel.h"
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#include "borg_hw/borg_hw.h"
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unsigned char shl_table[] = {0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
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void clear_screen(unsigned char value){
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unsigned char p,*pix,v=0xff;
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unsigned int i;
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for(p=0;p<NUMPLANE;p++){
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pix=&pixmap[p][0][0];
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if(p==value)
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v=0;
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for(i=0;i<NUM_ROWS*LINEBYTES;i++)
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pix[i]=v;
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}
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}
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void setpixel(pixel p, unsigned char value ){
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p.x %= NUM_COLS;
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if(value>NUMPLANE)
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value=NUMPLANE;
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unsigned char pos = (p.y%NUM_ROWS)*LINEBYTES + (p.x/8);
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unsigned char mask = shl_table[p.x%8];
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unsigned char plane;
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for(plane=0;plane<value;plane++)
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pixmap[plane][0][pos]|=mask;
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mask ^=0xff;
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for(;plane<NUMPLANE;plane++)
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pixmap[plane][0][pos]&=mask;
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}
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//shifts pixmap left. It is really shifted right, but because col0 is left in the Display it's left.
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void shift_pixmap_l(){
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unsigned char plane, row, byte;
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for(plane=0; plane<NUMPLANE; plane++){
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for(row=0;row<NUM_ROWS; row++){
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for(byte=0;byte<(LINEBYTES-1);byte++){
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pixmap[plane][row][byte] >>= 1;
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pixmap[plane][row][byte] |= (pixmap[plane][row][byte+1] & 0x01) * 0x80;;
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}
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pixmap[plane][row][LINEBYTES-1] >>= 1;
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}
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}
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}
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unsigned char get_pixel(pixel p){
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if( (p.x >= NUM_COLS) || (p.y >= NUM_ROWS) ){
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return 0xff;
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}else{
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return 0!= (pixmap[0][p.y][p.x/8] & shl_table[p.x%8]);
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}
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}
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