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png2hgr: mostly seems to work now

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This commit is contained in:
Vince Weaver 2018-08-24 16:18:25 -04:00
parent 63ea676e0e
commit c8e0b75ceb
1 changed files with 84 additions and 14 deletions
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98
hgr-utils/png2hgr.c
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@ -25,7 +25,7 @@
#define DEFAULT_BLACK 1
#endif
static int debug=1;
static int debug=0;
static int convert_color(int color) {
@ -53,16 +53,17 @@ static int convert_color(int color) {
/* These use the questionable palette my older code used */
/* Also handle the newer one */
/* Bitflipped because HGR is backwards, woz is crazy */
case 0x000000: c=0; break; /* black */
case 0x1bcb01: c=1; break; /* bright green */
case 0x14f53c: c=1; break; /* bright green */
case 0xe434fe: c=2; break; /* magenta */
case 0xe31e60: c=2; break; /* magenta */
case 0x1bcb01: c=2; break; /* bright green */
case 0x14f53c: c=2; break; /* bright green */
case 0xe434fe: c=1; break; /* magenta */
case 0xe31e60: c=1; break; /* magenta */
case 0xffffff: c=3; break; /* white */
case 0xcd5b01: c=5; break; /* orange */
case 0xff6a3c: c=5; break; /* orange */
case 0x1b9afe: c=6; break; /* medium blue */
case 0x14cffd: c=6; break; /* medium blue */
case 0xcd5b01: c=6; break; /* orange */
case 0xff6a3c: c=6; break; /* orange */
case 0x1b9afe: c=5; break; /* medium blue */
case 0x14cffd: c=5; break; /* medium blue */
default:
fprintf(stderr,"Unknown color %x\n",color);
@ -258,13 +259,78 @@ static int hgr_offset(int y) {
return address;
}
void colors_to_bytes(unsigned char colors[7],
/* Count both black/white variants */
static int color_high(int color) {
if ((color>2) || (color==0)) return 1;
return 0;
}
static int color_low(int color) {
if ((color<4) || (color==7)) return 1;
return 0;
}
static int colors_to_bytes(unsigned char colors[7],
unsigned char *byte1,
unsigned char *byte2) {
*byte1=0xff;
*byte2=0x55;
int highbit1=0,highbit2=0,lowbit1=0,lowbit2=0;
int hb1,hb2;
int error=0;
*byte1=0;
*byte2=0;
highbit1+=color_high(colors[0]);
highbit1+=color_high(colors[1]);
highbit1+=color_high(colors[2]);
highbit1+=color_high(colors[3]);
highbit2+=color_high(colors[3]);
highbit2+=color_high(colors[4]);
highbit2+=color_high(colors[5]);
highbit2+=color_high(colors[6]);
lowbit1+=color_low(colors[0]);
lowbit1+=color_low(colors[1]);
lowbit1+=color_low(colors[2]);
lowbit1+=color_low(colors[3]);
lowbit2+=color_low(colors[3]);
lowbit2+=color_low(colors[4]);
lowbit2+=color_low(colors[5]);
lowbit2+=color_low(colors[6]);
if (highbit1==4) hb1=1;
else if (lowbit1==4) hb1=0;
else {
error=1;
if (highbit1>lowbit1) hb1=1;
else hb1=0;
}
if (highbit2==4) hb2=1;
else if (lowbit2==4) hb2=0;
else {
error=2;
if (highbit2>lowbit2) hb2=1;
else hb2=0;
}
*byte1|=(colors[0]&3);
*byte1|=(colors[1]&3)<<2;
*byte1|=(colors[2]&3)<<4;
*byte1|=(colors[3]&1)<<6;
*byte1|=hb1<<7;
*byte2|=(colors[6]&3)<<5;
*byte2|=(colors[5]&3)<<3;
*byte2|=(colors[4]&3)<<1;
*byte2|=(colors[3]&2)>>1;
*byte2|=hb2<<7;
return error;
}
@ -272,7 +338,7 @@ static unsigned char apple2_image[8192];
int main(int argc, char **argv) {
int xsize=0,ysize=0;
int xsize=0,ysize=0,error;
int c,x,y,z,color1,color2;
unsigned char *image;
unsigned char byte1,byte2,colors[7];
@ -325,7 +391,11 @@ int main(int argc, char **argv) {
}
colors[z]=color1;
}
colors_to_bytes(colors,&byte1,&byte2);
error=colors_to_bytes(colors,&byte1,&byte2);
if (error!=0) {
fprintf(stderr,"Warning: mixing colors at %d x %d\n",
x*14+error*7,y);
}
apple2_image[hgr_offset(y)+(x*2)+0]=byte1;
apple2_image[hgr_offset(y)+(x*2)+1]=byte2;