mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-29 00:31:52 +00:00
437 lines
8.2 KiB
C
437 lines
8.2 KiB
C
/* Convert a 40x96 image into two, 40x48 images suitable of loading */
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/* with my kfest18 based code */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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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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static int convert_color(int color) {
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int c=0;
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switch(color) {
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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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default:
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printf("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, unsigned char **image_ptr, int *xsize, int *ysize,
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int high) {
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int x,y;
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int color;
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FILE *infile;
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int debug=0;
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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 number_of_passes;
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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/2;
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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 (debug) {
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printf("PNG: width=%d height=%d depth=%d\n",width,height,bit_depth);
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if (color_type==PNG_COLOR_TYPE_RGB) printf("Type RGB\n");
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else if (color_type==PNG_COLOR_TYPE_RGB_ALPHA) printf("Type RGBA\n");
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else if (color_type==PNG_COLOR_TYPE_PALETTE) printf("Type palette\n");
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}
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// number_of_passes = png_set_interlace_handling(png_ptr);
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png_read_update_info(png_ptr, info_ptr);
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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(png_get_rowbytes(png_ptr,info_ptr));
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}
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png_read_image(png_ptr, row_pointers);
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fclose(infile);
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image=calloc(width*height,sizeof(unsigned char));
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if (image==NULL) {
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fprintf(stderr,"Memory error!\n");
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return -1;
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}
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out_ptr=image;
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if (color_type==PNG_COLOR_TYPE_RGB_ALPHA) {
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for(y=high;y<height;y+=4) {
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for(x=0;x<width;x++) {
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/* top color */
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color= (row_pointers[y][x*4]<<16)+
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(row_pointers[y][x*4+1]<<8)+
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(row_pointers[y][x*4+2]);
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if (debug) {
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printf("%x ",color);
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}
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a2_color=convert_color(color);
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/* bottom color */
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color= (row_pointers[y+2][x*4]<<16)+
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(row_pointers[y+2][x*4+1]<<8)+
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(row_pointers[y+2][x*4+2]);
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if (debug) {
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printf("%x ",color);
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}
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a2_color|=(convert_color(color)<<4);
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*out_ptr=a2_color;
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out_ptr++;
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}
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if (debug) printf("\n");
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}
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}
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else if (color_type==PNG_COLOR_TYPE_PALETTE) {
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for(y=high;y<height;y+=4) {
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for(x=0;x<width;x++) {
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/* top color */
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a2_color=row_pointers[y][x];
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/* bottom color */
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color=row_pointers[y+2][x];
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a2_color|=(color<<4);
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if (debug) {
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printf("%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) printf("\n");
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}
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}
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else {
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printf("Unknown color type\n");
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}
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/* Stripe test image */
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// for(x=0;x<40;x++) for(y=0;y<40;y++) image[(y*width)+x]=y%16;
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/*
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Addr Row /80 %40
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$400 0 0 0 0
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$428 28 16 0
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$450 50 32 0
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$480 80 2 1
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$4A8 a8 18 1
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$4D0 d0 34 1
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$500 100 3 2
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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
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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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/*****************************************/
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/* \/ \/ */
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/* Converts a PNG to RLE compressed data */
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/*****************************************/
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static int print_run(int count, int out_type, int run, int last) {
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int size=0;
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if (count==0) {
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if (out_type==OUTPUT_C) {
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printf("\n\t");
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}
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else {
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printf("\n\t.byte ");
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}
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}
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else {
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if (out_type==OUTPUT_C) {
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}
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else {
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printf(", ");
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}
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}
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if (run==1) {
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if (out_type==OUTPUT_C) {
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printf("0x%02X,",last);
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}
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else {
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printf("$%02X",last);
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}
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size++;
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}
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if (run==2) {
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if (out_type==OUTPUT_C) {
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printf("0x%02X,0x%02X,",last,last);
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}
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else {
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printf("$%02X,$%02X",last,last);
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}
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size+=2;
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}
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if ((run>2) && (run<16)) {
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if (out_type==OUTPUT_C) {
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printf("0x%02X,0x%02X,",0xA0|run,last);
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}
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else {
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printf("$%02X,$%02X",0xA0|run,last);
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}
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size+=2;
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}
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if (run>=16) {
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if (out_type==OUTPUT_C) {
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printf("0x%02X,0x%02X,0x%02X,",0xA0,run,last);
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}
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else {
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printf("$%02X,$%02X,$%02X",0xA0,run,last);
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}
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size+=3;
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}
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return size;
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}
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int rle_smaller(int out_type, char *varname,
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int xsize,int ysize, unsigned char *image,int high) {
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int run=0;
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int x;
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int last=-1,next;
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int size=0;
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int count=0;
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x=0;
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/* Write out xsize and ysize */
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if (out_type==OUTPUT_C) {
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fprintf(stdout,"unsigned char %s_%s[]={\n",varname,
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high?"high":"low");
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fprintf(stdout,"\t0x%X, /* ysize=%d */",xsize,ysize);
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}
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else {
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fprintf(stdout,"%s_%s:",varname,high?"high":"low");
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fprintf(stdout,"\t.byte $%X ; ysize=%d",xsize,ysize);
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}
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size+=2;
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/* Get first top/bottom color pair */
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last=image[x];
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run++;
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x++;
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while(1) {
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/* get next top/bottom color pair */
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next=image[x];
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if ((next&0xf0)==0xA0) {
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fprintf(stderr,"Warning! Using color A (grey2)!\n");
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next&=~0xf0;
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next|=0x50; // substitute grey1
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}
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/* If color change (or too big) then output our run */
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/* Note 0xff for run length is special case meaning "finished" */
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if ((next!=last) || (run>254)) {
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size+=print_run(count,out_type,run,last);
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count++;
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run=0;
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last=next;
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}
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x++;
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/* If we reach the end */
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if (x>=xsize*(ysize/2)) {
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run++;
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size+=print_run(count,out_type,run,last);
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break;
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}
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run++;
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if (count>6) count=0;
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}
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/* Print closing marker */
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if (out_type==OUTPUT_C) {
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fprintf(stdout,"0xA1,");
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fprintf(stdout,"\t};\n");
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} else {
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fprintf(stdout,"\n\t.byte $A1\n");
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}
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size+=1;
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return size;
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}
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/* Converts a PNG to RLE compressed data */
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int main(int argc, char **argv) {
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unsigned char *image;
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int xsize,ysize;
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int size=0;
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int out_type=OUTPUT_C;
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if (argc<4) {
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fprintf(stderr,"Usage:\t%s type INFILE varname\n\n",argv[0]);
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fprintf(stderr,"\ttype: c or asm\n");
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fprintf(stderr,"\tvarname: label for graphic\n");
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fprintf(stderr,"\n");
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exit(-1);
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}
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if (!strcmp(argv[1],"c")) {
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out_type=OUTPUT_C;
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}
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else if (!strcmp(argv[1],"asm")) {
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out_type=OUTPUT_ASM;
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}
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if (loadpng(argv[2],&image,&xsize,&ysize,1)<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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// size=rle_original(out_type,argv[3],
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// xsize,ysize,image);
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size=rle_smaller(out_type,argv[3],
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xsize,ysize,image,0);
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fprintf(stderr,"Size %d bytes\n",size);
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if (loadpng(argv[2],&image,&xsize,&ysize,0)<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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// size=rle_original(out_type,argv[3],
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// xsize,ysize,image);
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size=rle_smaller(out_type,argv[3],
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xsize,ysize,image,1);
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fprintf(stderr,"Size %d bytes\n",size);
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return 0;
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}
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