mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-08 15:29:41 +00:00
70ab2f4223
this is a bit tricky, because we support forcing black/white colors by using slightly different palette entries, so we don't want to completely ignore the difference in case the image is trying to force one or another of the black/white colors for alignment or xdraw reasons
456 lines
9.7 KiB
C
456 lines
9.7 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,color_warnings=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; /* black1 */
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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; /* white1 */
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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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case 0x010101: c=4; break; /* black2 */
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case 0xfefefe: c=7; break; /* white2 */
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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>3) 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) return 1;
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return 0;
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}
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/* also count any black/white */
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static int color_high_bw(int color) {
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if (color>3) return 1;
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if ((color==0) || (color==3)) return 1;
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return 0;
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}
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static int color_low_bw(int color) {
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if (color<4) return 1;
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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 i;
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int highbit1=0,highbit2=0,lowbit1=0,lowbit2=0;
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int bwhigh1=0,bwlow1=0;
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int bwhigh2=0,bwlow2=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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for(i=0;i<7;i++) {
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highbit1+=color_high(colors[i]);
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lowbit1+=color_low(colors[i]);
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bwhigh1+=color_high_bw(colors[i]);
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bwlow1+=color_low_bw(colors[i]);
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}
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for(i=7;i<14;i++) {
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highbit2+=color_high(colors[i]);
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lowbit2+=color_low(colors[i]);
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bwhigh2+=color_high_bw(colors[i]);
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bwlow2+=color_low_bw(colors[i]);
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}
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if (highbit1==7) hb1=1; // all were high bit set
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else if (lowbit1==7) hb1=0; // all were lo bit set
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else if (bwhigh1==7) hb1=1; // ignore black/white
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else if (bwlow1==7) hb1=0;
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else {
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error=1;
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if (bwhigh1>bwlow1) hb1=1;
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else hb1=0;
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}
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if (highbit2==7) hb2=1; // all were high bit set
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else if (lowbit2==7) hb2=0; // all were lo bit set
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else if (bwhigh2==7) hb2=1; // ignore black/white
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else if (bwlow2==7) hb2=0;
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else {
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error=1;
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if (bwhigh2>bwlow2) 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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color_warnings++;
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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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fprintf(stderr,"Total warnings: %d\n",color_warnings);
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return 0;
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}
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