mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-26 11:30:12 +00:00
458 lines
9.6 KiB
C
458 lines
9.6 KiB
C
/* Converts 280x192 8-bit PNG file with correct palette to Apple II HGR */
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#define VERSION "0.0.1"
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#include <stdio.h> /* For FILE I/O */
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#include <string.h> /* For strncmp */
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#include <fcntl.h> /* for open() */
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#include <unistd.h> /* for lseek() */
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#include <sys/stat.h> /* for file modes */
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#include <stdlib.h> /* free() */
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#include <png.h>
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#define OUTPUT_C 0
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#define OUTPUT_ASM 1
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#define OUTPUT_RAW 2
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/* If you want default black a different color try the below */
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/* Useful if you are trying to xdraw to get red/blue */
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#if 0
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/* Default is BLACK0 */
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#define DEFAULT_BLACK -1
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#else
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/* DEFAULT is BLACK1 */
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#define DEFAULT_BLACK 1
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#endif
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static int debug=0;
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static int convert_color(int color) {
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int c=0;
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switch(color) {
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#if 0
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case 0x000000: c=0; break; /* black */
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case 0xe31e60: c=1; break; /* magenta */
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case 0x604ebd: c=2; break; /* dark blue */
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case 0xff44fd: c=3; break; /* purple */
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case 0x00a360: c=4; break; /* dark green */
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case 0x9c9c9c: c=5; break; /* grey 1 */
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case 0x14cffd: c=6; break; /* medium blue */
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case 0xd0c3ff: c=7; break; /* light blue */
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case 0x607203: c=8; break; /* brown */
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case 0xff6a3c: c=9; break; /* orange */
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case 0x9d9d9d: c=10; break; /* grey 2 */
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case 0xffa0d0: c=11; break; /* pink */
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case 0x14f53c: c=12; break; /* bright green */
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case 0xd0dd8d: c=13; break; /* yellow */
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case 0x72ffd0: c=14; break; /* aqua */
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case 0xffffff: c=15; break; /* white */
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#endif
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/* These use the questionable palette my older code used */
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/* Also handle the newer one */
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/* Bitflipped because HGR is backwards, woz is crazy */
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case 0x000000: c=0; break; /* black */
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case 0x1bcb01: c=2; break; /* bright green */
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case 0x14f53c: c=2; break; /* bright green */
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case 0xe434fe: c=1; break; /* magenta */
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case 0xe31e60: c=1; break; /* magenta */
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case 0xffffff: c=3; break; /* white */
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case 0xcd5b01: c=6; break; /* orange */
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case 0xff6a3c: c=6; break; /* orange */
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case 0x1b9afe: c=5; break; /* medium blue */
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case 0x14cffd: c=5; break; /* medium blue */
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default:
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fprintf(stderr,"Unknown color %x\n",color);
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break;
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}
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return c;
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}
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/* expects a PNG where the xsize is *2 */
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int loadpng(char *filename,
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unsigned char **image_ptr, int *xsize, int *ysize) {
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int x,y;
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int color;
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FILE *infile;
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unsigned char *image,*out_ptr;
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int width, height;
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int a2_color;
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png_byte bit_depth;
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png_structp png_ptr;
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png_infop info_ptr;
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png_bytep *row_pointers;
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png_byte color_type;
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int row_bytes,bytes_per_pixel;
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unsigned char header[8];
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/* open file and test for it being a png */
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infile = fopen(filename, "rb");
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if (infile==NULL) {
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fprintf(stderr,"Error! Could not open %s\n",filename);
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return -1;
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}
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/* Check the header */
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fread(header, 1, 8, infile);
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if (png_sig_cmp(header, 0, 8)) {
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fprintf(stderr,"Error! %s is not a PNG file\n",filename);
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return -1;
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}
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/* initialize stuff */
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png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (!png_ptr) {
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fprintf(stderr,"Error create_read_struct\n");
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exit(-1);
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}
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info_ptr = png_create_info_struct(png_ptr);
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if (!info_ptr) {
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fprintf(stderr,"Error png_create_info_struct\n");
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exit(-1);
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}
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png_init_io(png_ptr, infile);
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png_set_sig_bytes(png_ptr, 8);
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png_read_info(png_ptr, info_ptr);
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width = png_get_image_width(png_ptr, info_ptr);
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height = png_get_image_height(png_ptr, info_ptr);
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*xsize=width;
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*ysize=height;
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color_type = png_get_color_type(png_ptr, info_ptr);
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bit_depth = png_get_bit_depth(png_ptr, info_ptr);
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if (width!=280) {
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fprintf(stderr,"Unknown width %d\n",width);
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return -1;
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}
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if (height!=192) {
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fprintf(stderr,"Unknown height %d\n",height);
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return -1;
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}
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image=calloc(width*height,sizeof(unsigned char));
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if (image==NULL) {
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fprintf(stderr,"Error allocating image\n");
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return -1;
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}
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if (debug) {
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fprintf(stderr,"PNG: width=%d height=%d depth=%d\n",
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width,height,bit_depth);
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if (color_type==PNG_COLOR_TYPE_RGB) {
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fprintf(stderr,"Type RGB\n");
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}
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else if (color_type==PNG_COLOR_TYPE_RGB_ALPHA) {
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fprintf(stderr,"Type RGBA\n");
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}
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else if (color_type==PNG_COLOR_TYPE_PALETTE) {
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fprintf(stderr,"Type palette\n");
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}
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}
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/* If palette, expand to RGB automatically */
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if (color_type == PNG_COLOR_TYPE_PALETTE) {
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png_set_expand(png_ptr);
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}
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png_read_update_info(png_ptr, info_ptr);
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row_bytes = png_get_rowbytes(png_ptr, info_ptr);
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// *pChannels = (int)png_get_channels(png_ptr, info_ptr);
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bytes_per_pixel=row_bytes/width;
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if (debug) {
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fprintf(stderr,"Rowbytes=%d bytes per pixel=%d\n",
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row_bytes,row_bytes/width);
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}
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row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * height);
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for (y=0; y<height; y++) {
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row_pointers[y] = (png_byte*)malloc(row_bytes);
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}
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png_read_image(png_ptr, row_pointers);
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png_read_end(png_ptr, NULL);
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fclose(infile);
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out_ptr=image;
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for(y=0;y<height;y++) {
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for(x=0;x<width;x++) {
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color= (row_pointers[y][x*bytes_per_pixel]<<16)+
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(row_pointers[y][x*bytes_per_pixel+1]<<8)+
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(row_pointers[y][x*bytes_per_pixel+2]);
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// if (debug) {
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// fprintf(stderr,"%x ",color);
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// }
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a2_color=convert_color(color);
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if (debug) {
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fprintf(stderr,"%x",a2_color);
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}
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*out_ptr=a2_color;
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out_ptr++;
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}
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if (debug) fprintf(stderr,"\nNR: ");
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}
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*image_ptr=image;
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return 0;
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}
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/* Converts a PNG to RAW 8K Hires Image */
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static void print_help(char *name,int version) {
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printf("\npng2hgr version %s\n",VERSION);
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if (version) exit(1);
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printf("\nUsage: %s [-r] [-s] PNGFILE\n\n",name);
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printf("\t[-r] raw, don't prepend with BLOAD addr/size\n");
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printf("\t[-s] short, leave off bottom text area\n");
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printf("\n");
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exit(1);
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}
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static int hgr_offset_table[48]={
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0x0000,0x0080,0x0100,0x0180,0x0200,0x0280,0x0300,0x0380,
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0x0028,0x00A8,0x0128,0x01A8,0x0228,0x02A8,0x0328,0x03A8,
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0x0050,0x00D0,0x0150,0x01D0,0x0250,0x02D0,0x0350,0x03D0,
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};
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static int hgr_offset(int y) {
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int temp,temp2,address;
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temp=y/8;
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temp2=y%8;
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temp2=temp2*0x400;
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address=hgr_offset_table[temp]+temp2;
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return address;
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}
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/* Count both black/white variants */
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static int color_high(int color) {
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if ((color>2) || (color==0)) return 1;
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return 0;
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}
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static int color_low(int color) {
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if ((color<4) || (color==7)) return 1;
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return 0;
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}
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static int colors_to_bytes(unsigned char colors[14],
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unsigned char *byte1,
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unsigned char *byte2) {
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int highbit1=0,highbit2=0,lowbit1=0,lowbit2=0;
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int hb1,hb2;
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int error=0;
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*byte1=0;
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*byte2=0;
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highbit1+=color_high(colors[0]);
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highbit1+=color_high(colors[1]);
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highbit1+=color_high(colors[2]);
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highbit1+=color_high(colors[3]);
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highbit1+=color_high(colors[4]);
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highbit1+=color_high(colors[5]);
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highbit1+=color_high(colors[6]);
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highbit2+=color_high(colors[7]);
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highbit2+=color_high(colors[8]);
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highbit2+=color_high(colors[9]);
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highbit2+=color_high(colors[10]);
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highbit2+=color_high(colors[11]);
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highbit2+=color_high(colors[12]);
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highbit2+=color_high(colors[13]);
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lowbit1+=color_low(colors[0]);
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lowbit1+=color_low(colors[1]);
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lowbit1+=color_low(colors[2]);
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lowbit1+=color_low(colors[3]);
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lowbit1+=color_low(colors[4]);
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lowbit1+=color_low(colors[5]);
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lowbit1+=color_low(colors[6]);
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lowbit2+=color_low(colors[7]);
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lowbit2+=color_low(colors[8]);
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lowbit2+=color_low(colors[9]);
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lowbit2+=color_low(colors[10]);
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lowbit2+=color_low(colors[11]);
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lowbit2+=color_low(colors[12]);
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lowbit2+=color_low(colors[13]);
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if (highbit1==7) hb1=1;
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else if (lowbit1==7) hb1=0;
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else {
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error=1;
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if (highbit1>lowbit1) hb1=1;
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else hb1=0;
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}
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if (highbit2==7) hb2=1;
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else if (lowbit2==7) hb2=0;
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else {
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error=2;
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if (highbit2>lowbit2) hb2=1;
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else hb2=0;
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}
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/*
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0 0 0 0 -> 00 00
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1 1 1 1 -> 01 01
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2 2 2 2 -> 10 10
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3 3 3 3 -> 11 11
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1 3 3 1 -> 01 11
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1 1 2 2 3 3 0 -> 0 11 10 01
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*/
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*byte1|=(colors[0]&1)<<0;
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*byte1|=(colors[1]&2)<<0;
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*byte1|=(colors[2]&1)<<2;
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*byte1|=(colors[3]&2)<<2;
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*byte1|=(colors[4]&1)<<4;
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*byte1|=(colors[5]&2)<<4;
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*byte1|=(colors[6]&1)<<6;
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*byte1|=hb1<<7;
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*byte2|=(colors[7]&2)>>1;
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*byte2|=(colors[8]&1)<<1;
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*byte2|=(colors[9]&2)<<1;
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*byte2|=(colors[10]&1)<<3;
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*byte2|=(colors[11]&2)<<3;
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*byte2|=(colors[12]&1)<<5;
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*byte2|=(colors[13]&2)<<5;
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*byte2|=hb2<<7;
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return error;
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}
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static unsigned char apple2_image[8192];
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int main(int argc, char **argv) {
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int xsize=0,ysize=0,error;
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int c,x,y,z,color1;
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unsigned char *image;
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unsigned char byte1,byte2,colors[14];
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char *filename;
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/* Parse command line arguments */
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while ( (c=getopt(argc, argv, "hvd") ) != -1) {
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switch(c) {
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case 'h':
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print_help(argv[0],0);
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break;
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case 'v':
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print_help(argv[0],1);
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break;
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case 'd':
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debug=1;
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break;
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default:
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print_help(argv[0],0);
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break;
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}
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}
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if (optind>=argc) {
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printf("ERROR: Was expecting filename!\n");
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exit(1);
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}
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filename=strdup(argv[optind]);
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memset(apple2_image,0,8192);
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if (loadpng(filename,&image,&xsize,&ysize)<0) {
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fprintf(stderr,"Error loading png!\n");
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exit(-1);
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}
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fprintf(stderr,"Loaded image %d by %d\n",xsize,ysize);
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for(y=0;y<192;y++) {
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for(x=0;x<20;x++) {
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for(z=0;z<14;z++) {
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color1=image[y*280+x*14+z];
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// if (color1!=color2) {
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// fprintf(stderr,"Warning: color at %d x %d doesn't match\n",
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// x*14+z*2,y);
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//
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// }
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colors[z]=color1;
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}
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error=colors_to_bytes(colors,&byte1,&byte2);
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if (error!=0) {
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fprintf(stderr,"Warning: mixing colors at %d x %d\n",
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x*14+error*7,y);
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}
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apple2_image[hgr_offset(y)+(x*2)+0]=byte1;
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apple2_image[hgr_offset(y)+(x*2)+1]=byte2;
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}
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}
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fwrite(apple2_image,8192,sizeof(unsigned char),stdout);
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return 0;
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}
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