371 lines
7.6 KiB
C
371 lines
7.6 KiB
C
/* Converts 280x192 8-bit PNG file with correct palette to an HGR compat font*/
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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_ORIGINAL 0
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#define OUTPUT_INTERLEAVE 1
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#define OUTPUT_BINARY 2
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static int debug=0;
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static int print_fancy_byte(int value) {
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int i,reversed;
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/* 001 01110 -> X011 1010 */
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/* 7654 3210 -> 012 3456 */
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reversed=0;
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for(i=0;i<8;i++) {
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reversed|=(1<<(i-1))*(!!(value&(1<<(7-i))));
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}
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printf("\t.byte $%02X\t; ",reversed);
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for(i=0;i<5;i++) {
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printf("%c",((1<<(4-i))&value)?'1':'0');
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}
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printf(" X");
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for(i=0;i<7;i++) {
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if (i==3) printf(" ");
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printf("%c",((1<<(6-i))&reversed)?'1':'0');
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}
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printf("\n");
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return 0;
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}
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static int print_interleave_byte(int value,int y) {
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int i,reversed;
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/* 0001 0111 -> X011 1010 */
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/* 7654 3210 -> 01 2345 */
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reversed=0;
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for(i=0;i<8;i++) {
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reversed|=(1<<(i-1))*(!!(value&(1<<(7-i))));
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}
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printf("\t.byte $%02X\t ; ",reversed);
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if ((y>0x20) && (y<0x7f)) printf("%c",y);
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printf("\n");
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return 0;
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}
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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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/* 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 */
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static 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 [-b] [-i] PNGFILE\n\n",name);
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printf("\t[-b] binary output\n");
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printf("\t[-i] interleaved output\n");
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printf("\n");
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exit(1);
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}
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static unsigned char font_data[256][16];
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int main(int argc, char **argv) {
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int xsize=0,ysize=0,temp;
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int c,x,y,row,col;
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unsigned char *image;
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char *filename;
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int output_type=OUTPUT_ORIGINAL;
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int start_offset=0x20;
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/* Parse command line arguments */
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while ( (c=getopt(argc, argv, "hvdibo:") ) != -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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case 'i':
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output_type=OUTPUT_INTERLEAVE;
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break;
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case 'b':
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output_type=OUTPUT_BINARY;
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break;
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case 'o':
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start_offset=strtod(optarg,NULL);
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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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fprintf(stderr,"Using font offset of 0x%x\n",start_offset);
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/* for now, assume 5x8 font starting at 14,8 */
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for(row=0;row<4;row++) {
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for(col=0;col<32;col++) {
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for(y=0;y<8;y++) {
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temp=0;
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for(x=0;x<7;x++) {
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if (image[ (((row*8)+y+8)*280)+(col*7)+x+14]) {
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temp=temp|(1<<(6-x));
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}
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}
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font_data[(row*32)+col][y]=temp;
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}
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}
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}
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// fwrite(apple2_image,8192,sizeof(unsigned char),stdout);
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/* old-fashioned output */
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if (output_type==OUTPUT_ORIGINAL) {
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printf("hgr_font:\n");
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for(c=start_offset;c<0x80;c++) {
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printf("; %c $%02X\n",c,c);
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for(y=0;y<8;y++) {
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print_fancy_byte(font_data[c][y]);
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}
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}
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}
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else if (output_type==OUTPUT_INTERLEAVE) {
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for(row=0;row<8;row++) {
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printf("CondensedRow%d:\n",row);
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for(y=start_offset;y<0x80;y++) {
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print_interleave_byte(font_data[y][row],y);
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}
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}
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}
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else if (output_type==OUTPUT_BINARY) {
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fprintf(stderr,"ERROR! Binary not implemented yet\n");
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}
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else {
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fprintf(stderr,"ERROR! Unknown output\n");
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}
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return 0;
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}
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