mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-08-15 02:29:09 +00:00
207 lines
4.5 KiB
C
207 lines
4.5 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdarg.h>
|
|
|
|
#include <png.h>
|
|
|
|
|
|
static int convert_color(int color) {
|
|
|
|
int c=0;
|
|
|
|
switch(color) {
|
|
case 0x000000: c=0; break; /* black */
|
|
case 0xe31e60: c=1; break; /* magenta */
|
|
case 0x604ebd: c=2; break; /* dark blue */
|
|
case 0xff44fd: c=3; break; /* purple */
|
|
case 0x00a360: c=4; break; /* dark green */
|
|
case 0x9c9c9c: c=5; break; /* grey 1 */
|
|
case 0x14cffd: c=6; break; /* medium blue */
|
|
case 0xd0c3ff: c=7; break; /* light blue */
|
|
case 0x607203: c=8; break; /* brown */
|
|
case 0xff6a3c: c=9; break; /* orange */
|
|
case 0x9d9d9d: c=10; break; /* grey 2 */
|
|
case 0xffa0d0: c=11; break; /* pink */
|
|
case 0x14f53c: c=12; break; /* bright green */
|
|
case 0xd0dd8d: c=13; break; /* yellow */
|
|
case 0x72ffd0: c=14; break; /* aqua */
|
|
case 0xffffff: c=15; break; /* white */
|
|
default:
|
|
printf("Unknown color %x\n",color);
|
|
break;
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
/* expects a PNG where the xsize is *2 */
|
|
int loadpng(char *filename, unsigned char **image_ptr, int *xsize, int *ysize) {
|
|
|
|
int x,y;
|
|
int color;
|
|
FILE *infile;
|
|
int debug=0;
|
|
unsigned char *image,*out_ptr;
|
|
int width, height;
|
|
int a2_color;
|
|
|
|
png_byte bit_depth;
|
|
png_structp png_ptr;
|
|
png_infop info_ptr;
|
|
png_bytep *row_pointers;
|
|
png_byte color_type;
|
|
// int number_of_passes;
|
|
|
|
unsigned char header[8];
|
|
|
|
/* open file and test for it being a png */
|
|
infile = fopen(filename, "rb");
|
|
if (infile==NULL) {
|
|
fprintf(stderr,"Error! Could not open %s\n",filename);
|
|
return -1;
|
|
}
|
|
|
|
/* Check the header */
|
|
fread(header, 1, 8, infile);
|
|
if (png_sig_cmp(header, 0, 8)) {
|
|
fprintf(stderr,"Error! %s is not a PNG file\n",filename);
|
|
return -1;
|
|
}
|
|
|
|
/* initialize stuff */
|
|
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
|
|
if (!png_ptr) {
|
|
fprintf(stderr,"Error create_read_struct\n");
|
|
exit(-1);
|
|
}
|
|
|
|
info_ptr = png_create_info_struct(png_ptr);
|
|
if (!info_ptr) {
|
|
fprintf(stderr,"Error png_create_info_struct\n");
|
|
exit(-1);
|
|
}
|
|
|
|
png_init_io(png_ptr, infile);
|
|
png_set_sig_bytes(png_ptr, 8);
|
|
|
|
png_read_info(png_ptr, info_ptr);
|
|
|
|
width = png_get_image_width(png_ptr, info_ptr);
|
|
height = png_get_image_height(png_ptr, info_ptr);
|
|
*xsize=width/2;
|
|
*ysize=height;
|
|
|
|
color_type = png_get_color_type(png_ptr, info_ptr);
|
|
bit_depth = png_get_bit_depth(png_ptr, info_ptr);
|
|
|
|
|
|
|
|
if (debug) {
|
|
printf("PNG: width=%d height=%d depth=%d\n",width,height,bit_depth);
|
|
if (color_type==PNG_COLOR_TYPE_RGB) printf("Type RGB\n");
|
|
else if (color_type==PNG_COLOR_TYPE_RGB_ALPHA) printf("Type RGBA\n");
|
|
else if (color_type==PNG_COLOR_TYPE_PALETTE) printf("Type palette\n");
|
|
}
|
|
|
|
// number_of_passes = png_set_interlace_handling(png_ptr);
|
|
png_read_update_info(png_ptr, info_ptr);
|
|
|
|
row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * height);
|
|
for (y=0; y<height; y++) {
|
|
row_pointers[y] = (png_byte*) malloc(png_get_rowbytes(png_ptr,info_ptr));
|
|
}
|
|
|
|
png_read_image(png_ptr, row_pointers);
|
|
|
|
fclose(infile);
|
|
|
|
image=calloc(width*height/2,sizeof(unsigned char));
|
|
if (image==NULL) {
|
|
fprintf(stderr,"Memory error!\n");
|
|
return -1;
|
|
}
|
|
out_ptr=image;
|
|
|
|
if (color_type==PNG_COLOR_TYPE_RGB_ALPHA) {
|
|
for(y=0;y<height;y+=2) {
|
|
for(x=0;x<width/2;x++) {
|
|
|
|
/* top color */
|
|
color= (row_pointers[y][x*2*4]<<16)+
|
|
(row_pointers[y][x*2*4+1]<<8)+
|
|
(row_pointers[y][x*2*4+2]);
|
|
if (debug) {
|
|
printf("%x ",color);
|
|
}
|
|
|
|
a2_color=convert_color(color);
|
|
|
|
/* bottom color */
|
|
color= (row_pointers[y+1][x*2*4]<<16)+
|
|
(row_pointers[y+1][x*2*4+1]<<8)+
|
|
(row_pointers[y+1][x*2*4+2]);
|
|
if (debug) {
|
|
printf("%x ",color);
|
|
}
|
|
|
|
a2_color|=(convert_color(color)<<4);
|
|
|
|
*out_ptr=a2_color;
|
|
out_ptr++;
|
|
}
|
|
if (debug) printf("\n");
|
|
}
|
|
}
|
|
else if (color_type==PNG_COLOR_TYPE_PALETTE) {
|
|
for(y=0;y<height;y+=2) {
|
|
for(x=0;x<width/2;x++) {
|
|
|
|
/* top color */
|
|
a2_color=row_pointers[y][x*2];
|
|
|
|
/* bottom color */
|
|
color=row_pointers[y+1][x*2];
|
|
|
|
a2_color|=(color<<4);
|
|
|
|
if (debug) {
|
|
printf("%x ",a2_color);
|
|
}
|
|
|
|
*out_ptr=a2_color;
|
|
out_ptr++;
|
|
}
|
|
if (debug) printf("\n");
|
|
}
|
|
}
|
|
else {
|
|
printf("Unknown color type\n");
|
|
}
|
|
|
|
/* Stripe test image */
|
|
// for(x=0;x<40;x++) for(y=0;y<40;y++) image[(y*width)+x]=y%16;
|
|
|
|
/*
|
|
Addr Row /80 %40
|
|
$400 0 0 0 0
|
|
$428 28 16 0
|
|
$450 50 32 0
|
|
$480 80 2 1
|
|
$4A8 a8 18 1
|
|
$4D0 d0 34 1
|
|
$500 100 3 2
|
|
0,0 0,1 0,2....0,39 16,0 16,1 ....16,39 32,0..32,39, X X X X X X X X
|
|
*/
|
|
|
|
*image_ptr=image;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|