dos33fsprogs/gr-utils/png2rle.c
Vince Weaver fa36d30d8b png2rle: add raw target
turns out RLE is better compressing than lz4 in many cases
2018-09-27 21:10:08 -04:00

359 lines
6.0 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include "loadpng.h"
#define OUTPUT_C 0
#define OUTPUT_ASM 1
#define OUTPUT_RAW 2
/* Converts a PNG to RLE compressed data */
int rle_original(int out_type, char *varname,
int xsize,int ysize, unsigned char *image) {
int run=0;
int x;
int last=-1,next;
int size=0;
int count=0;
x=0;
/* Write out xsize and ysize */
if (out_type==OUTPUT_C) {
fprintf(stdout,"unsigned char %s[]={\n",varname);
fprintf(stdout,"\t0x%X,0x%X,",xsize,ysize);
}
else if (out_type==OUTPUT_ASM) {
fprintf(stdout,"%s:",varname);
fprintf(stdout,"\t.byte $%X,$%X",xsize,ysize);
}
size+=2;
/* Get first top/bottom color pair */
last=image[x];
run++;
x++;
while(1) {
/* get next top/bottom color pair */
next=image[x];
/* If color change (or too big) then output our run */
/* Note 0xff for run length is special case meaning "finished" */
if ((next!=last) || (run>253)) {
/* handle new line */
if (out_type==OUTPUT_C) {
if (count==0) {
printf("\n\t");
}
}
else if (out_type==OUTPUT_ASM) {
if (count==0) {
printf("\n\t.byte ");
}
else {
printf(", ");
}
}
if (out_type==OUTPUT_C) {
printf("0x%02X,0x%02X, ",run,last);
}
else if (out_type==OUTPUT_ASM) {
printf("$%02X,$%02X",run,last);
}
else {
printf("%c",run);
printf("%c",last);
}
size+=2;
count++;
run=0;
last=next;
}
x++;
/* If we reach the end */
if (x>=xsize*(ysize/2)) {
run++;
/* print tailing value */
if (run!=0) {
if (out_type==OUTPUT_C) {
printf("0x%02X,0x%02X, ",run,last);
}
else if (out_type==OUTPUT_ASM) {
if (count==0) {
printf("\n\t.byte ");
}
else {
printf(", ");
}
printf("$%02X,$%02X\n",run,last);
} else {
printf("%c",run);
printf("%c",last);
}
size+=2;
}
break;
}
run++;
if (count>6) count=0;
}
/* Print closing marker */
if (out_type==OUTPUT_C) {
fprintf(stdout,"0xFF,0xFF,");
fprintf(stdout,"\t};\n");
} else if (out_type==OUTPUT_ASM) {
fprintf(stdout,"\t.byte $FF,$FF\n");
}
size+=2;
return size;
}
/*****************************************/
/* \/ \/ */
/* Converts a PNG to RLE compressed data */
/*****************************************/
static int print_run(int count, int out_type, int run, int last) {
int size=0;
if (count==0) {
if (out_type==OUTPUT_C) {
printf("\n\t");
}
else if (out_type==OUTPUT_ASM) {
printf("\n\t.byte ");
}
}
else {
if (out_type==OUTPUT_C) {
}
else if (out_type==OUTPUT_ASM) {
printf(", ");
}
}
if (run==1) {
if (out_type==OUTPUT_C) {
printf("0x%02X,",last);
}
else if (out_type==OUTPUT_ASM) {
printf("$%02X",last);
}
else {
printf("%c",last);
}
size++;
}
if (run==2) {
if (out_type==OUTPUT_C) {
printf("0x%02X,0x%02X,",last,last);
}
else if (out_type==OUTPUT_ASM) {
printf("$%02X,$%02X",last,last);
}
else {
printf("%c",last);
printf("%c",last);
}
size+=2;
}
if ((run>2) && (run<16)) {
if (out_type==OUTPUT_C) {
printf("0x%02X,0x%02X,",0xA0|run,last);
}
else if (out_type==OUTPUT_ASM) {
printf("$%02X,$%02X",0xA0|run,last);
}
else {
printf("%c",0xA0|run);
printf("%c",last);
}
size+=2;
}
if (run>=16) {
if (out_type==OUTPUT_C) {
printf("0x%02X,0x%02X,0x%02X,",0xA0,run,last);
}
else if (out_type==OUTPUT_ASM) {
printf("$%02X,$%02X,$%02X",0xA0,run,last);
}
else {
printf("%c",0xA0);
printf("%c",run);
printf("%c",last);
}
size+=3;
}
return size;
}
int rle_smaller(int out_type, char *varname,
int xsize,int ysize, unsigned char *image) {
int run=0;
int x;
int last=-1,next;
int size=0;
int count=0;
x=0;
/* Write out xsize and ysize */
if (out_type==OUTPUT_C) {
fprintf(stdout,"unsigned char %s[]={\n",varname);
fprintf(stdout,"\t0x%X, /* ysize=%d */",xsize,ysize);
}
else if (out_type==OUTPUT_ASM) {
fprintf(stdout,"%s:",varname);
fprintf(stdout,"\t.byte $%X ; ysize=%d",xsize,ysize);
} else {
fprintf(stdout,"%c",xsize);
}
size+=2;
/* Get first top/bottom color pair */
last=image[x];
run++;
x++;
while(1) {
/* get next top/bottom color pair */
next=image[x];
if ((next&0xf0)==0xA0) {
fprintf(stderr,"Warning! Using color A (grey2)!\n");
next&=~0xf0;
next|=0x50; // substitute grey1
}
/* If color change (or too big) then output our run */
/* Note 0xff for run length is special case meaning "finished" */
if ((next!=last) || (run>254)) {
size+=print_run(count,out_type,run,last);
count++;
run=0;
last=next;
}
x++;
/* If we reach the end */
if (x>=xsize*(ysize/2)) {
run++;
size+=print_run(count,out_type,run,last);
break;
}
run++;
if (count>6) count=0;
}
/* Print closing marker */
if (out_type==OUTPUT_C) {
fprintf(stdout,"0xA1,");
fprintf(stdout,"\t};\n");
} else if (out_type==OUTPUT_ASM) {
fprintf(stdout,"\n\t.byte $A1\n");
} else {
fprintf(stdout,"%c",0xA1);
}
size+=1;
return size;
}
/* Converts a PNG to RLE compressed data */
int main(int argc, char **argv) {
unsigned char *image;
int xsize,ysize;
int size=0;
int out_type=OUTPUT_C;
if (argc<4) {
fprintf(stderr,"Usage:\t%s type INFILE varname\n\n",argv[0]);
fprintf(stderr,"\ttype: c or asm or raw\n");
fprintf(stderr,"\tvarname: label for graphic\n");
fprintf(stderr,"\n");
exit(-1);
}
if (!strcmp(argv[1],"c")) {
out_type=OUTPUT_C;
}
else if (!strcmp(argv[1],"asm")) {
out_type=OUTPUT_ASM;
}
else if (!strcmp(argv[1],"raw")) {
out_type=OUTPUT_RAW;
}
if (loadpng(argv[2],&image,&xsize,&ysize)<0) {
fprintf(stderr,"Error loading png!\n");
exit(-1);
}
fprintf(stderr,"Loaded image %d by %d\n",xsize,ysize);
// size=rle_original(out_type,argv[3],
// xsize,ysize,image);
size=rle_smaller(out_type,argv[3],
xsize,ysize,image);
fprintf(stderr,"Size %d bytes\n",size);
return 0;
}