mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-01 16:04:55 +00:00
173 lines
3.6 KiB
C
173 lines
3.6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static int runlen[4]={0,0,0,0},last_color[4]={-1,-1,-1,-1};
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static int new_size=0;
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static unsigned char row[4][256];
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static int rle_compress(int color, int j) {
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int need_comma=0;
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if ((color==last_color[j]) && (runlen[j]<255)) {
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runlen[j]++;
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// printf("Match %d %d\n",color,runlen[j]);
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}
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else {
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need_comma=1;
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// printf("Run of color %d length %d\n",
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// last_color[j],runlen[j]);
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if (runlen[j]==0) { // first color, skip
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need_comma=0;
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}
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else if (runlen[j]==1) {
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printf("$%02X",last_color[j]);
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new_size++;
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}
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else if (runlen[j]==2) {
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printf("$%02X,$%02X",last_color[j],last_color[j]);
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new_size+=2;
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}
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else if ((runlen[j]>2) && (runlen[j]<16)) {
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printf("$%02X,$%02X",0xa0 | (runlen[j]),
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last_color[j]);
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new_size+=2;
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}
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/* We could in theory compress up to 272 */
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/* but we leave it at 256 to make the decode easier */
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else if ((runlen[j]>15) && (runlen[j]<256)) {
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new_size+=3;
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printf("$%02X,$%02X,$%02X",0xa0,
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runlen[j],last_color[j]);
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}
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else if (runlen[j]>=256) {
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printf("Too big!\n");
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exit(1);
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}
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last_color[j]=color;
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runlen[j]=1;
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}
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return need_comma;
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}
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void plot(int x, int y, int color) {
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int half,odd;
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half=y/2;
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odd=y&1;
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if (odd) {
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row[half][x]=row[half][x]|(color<<4);
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}
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else {
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row[half][x]=row[half][x]|(color);
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}
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}
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int main(int argc, char **argv) {
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int length=0,x,y;
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int need_comma;
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memset(row,0,sizeof(row));
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length=255;
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/* 0 - 20 */
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plot(2,5,15); plot(5,2,15); plot(9,1,13);
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plot(12,3,15); plot(13,5,15); plot(16,5,15); plot(17,2,15);
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plot(19,1,5); plot(20,0,5); plot(20,2,5); plot(21,1,5);
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plot(20,1,15);
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/* 20-40 */
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plot(24,4,7); plot(29,5,7); plot(30,2,15); plot(33,0,15);
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plot(35,2,5);
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/* 41-60 */
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plot(41,0,13); plot(42,0,13);
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plot(42,1,13); plot(43,1,13);
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plot(43,2,13);
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plot(43,3,13);
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plot(42,4,13); plot(43,4,13);
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plot(41,5,13); plot(42,5,13);
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plot(49,5,13); plot(51,1,15); plot(51,2,15);
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plot(53,3,15); plot(55,3,15); plot(55,4,15);
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plot(57,0,1); plot(57,1,1);
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/* 60 - 80 */
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plot(64,2,7); plot(64,4,7); plot(64,6,7);
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plot(65,1,7); plot(65,3,7); plot(65,5,7);
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plot(66,1,7); plot(66,3,7); plot(67,5,7);
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plot(67,1,7); plot(67,3,7); plot(68,5,7);
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plot(68,1,7); plot(68,3,7); plot(68,5,7);
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plot(69,3,7);
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plot(66,2,5); plot(67,2,5); plot(68,2,5); plot(69,2,5);
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plot(66,4,5); plot(67,4,5); plot(68,4,5); plot(69,4,5);
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plot(69,1,13); plot(70,1,13); plot(69,5,13); plot(70,5,13);
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plot(70,2,15); plot(71,2,15);
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plot(70,3,15); plot(71,3,15); plot(72,3,15);
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plot(70,4,15); plot(71,4,15);
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plot(78,1,7); plot(77,5,15);
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/* 80 - 100 */
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plot(83,5,5); plot(88,0,5);
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plot(90,3,15); plot(96,2,5);
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/* 100 - 120 */
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plot(102,2,7); plot(106,0,15); plot(109,5,5);
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plot(114,4,13);
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/* 120 - 140 */
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plot(120,3,5); plot(124,1,13); plot(129,4,15);
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plot(135,4,7);
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/* 140 - 160 */
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plot(143,1,5); plot(144,5,13); plot(150,2,15);
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plot(156,4,7);
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/* 160 - 180 */
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plot(168,4,15); plot(175,2,5);
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/* Copy edges to make it wrap around */
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for(y=0;y<4;y++) {
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for(x=0;x<40;x++) {
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row[y][x+182]=row[y][x];
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}
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}
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printf("; Original size = %d bytes\n",length*4);
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printf("sky_background:\n");
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printf("; scroll_length:\n.byte %d\n",length);
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for(y=0;y<4;y++) {
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//printf("scroll_row%d:\n",y+1);
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printf("\t.byte ");
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for(x=0;x<256;x++) {
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need_comma=rle_compress(row[y][x],y);
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if ((need_comma)) {// && (x!=length-1))
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printf(",");
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}
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//last_color[y]=row[y][x];
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}
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rle_compress(-1,y);
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printf("\n");
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}
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printf("\t.byte $A1\n");
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new_size++;
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printf("; Compressed size = %d bytes\n",new_size);
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return 0;
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}
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