543 lines
12 KiB
C
543 lines
12 KiB
C
/* Loads a 80x48 (or 40x48) PNG image into a 40x48 Apple II layout */
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/* Also supports 280x192 */
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/* It's not interleaved like an actual Apple II */
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/* But the top/bottom are pre-packed into a naive 40x24 array */
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/* Note there's a hack to treat color 17 (0xf5ff00) as an alias for color 10 */
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/* for transparency reasons */
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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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#include "loadpng.h"
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static int convert_color(int color, char *filename) {
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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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case 0xf5ff00: c=10; break; /* transparent */
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default:
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fprintf(stderr,"Unknown color %x, file %s\n",
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color,filename);
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exit(-1);
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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 either 40 or 80 or 280 */
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/* if it is 80, it skips every other */
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/* if 280, it skips every 7 */
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/* why do that? when editing an image the aspect ratio looks better if */
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/* it is an 80 wide picture */
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/* xsize, ysize is the size of the result, not size of */
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/* the input image */
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int loadpng(char *filename, unsigned char **image_ptr, int *xsize, int *ysize,
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int png_type) {
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int x,y,ystart,yadd,xadd;
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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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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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/* get the xadd */
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if (width==40) {
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*xsize=40;
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xadd=1;
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yadd=1;
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}
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else if (width==80) {
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if (png_type==PNG_NO_ADJUST) {
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*xsize=80;
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xadd=1;
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}
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else {
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*xsize=40;
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xadd=2;
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}
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yadd=1;
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}
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else if (width==280) {
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*xsize=40;
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xadd=7;
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yadd=4; /* FIXME: check we are 192 in ysize */
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}
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else if (width==16) {
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*xsize=16;
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xadd=1;
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yadd=1;
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}
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else {
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fprintf(stderr,"Unsupported width %d\n",width);
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return -1;
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}
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if ((png_type==PNG_WHOLETHING) || (png_type==PNG_NO_ADJUST)) {
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*ysize=height;
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ystart=0;
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yadd*=2;
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}
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else if (png_type==PNG_ODDLINES) {
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*ysize=height/2;
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ystart=1;
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yadd*=4;
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}
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else if (png_type==PNG_EVENLINES) {
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*ysize=height/2;
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ystart=0;
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yadd*=4;
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}
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else if (png_type==PNG_RAW) {
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/* FIXME, not working */
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*ysize=height;
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ystart=0;
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yadd=1;
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}
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else {
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fprintf(stderr,"Unknown PNG type\n");
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return -1;
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}
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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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printf("Generating output size %d x %d\n",*xsize,*ysize);
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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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/* FIXME: do we ever free these? */
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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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/* FIXME: this should be 40x24 max??? */
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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=ystart;y<height;y+=yadd) {
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for(x=0;x<width;x+=xadd) {
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/* top color */
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color= (row_pointers[y][x*xadd*4]<<16)+
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(row_pointers[y][x*xadd*4+1]<<8)+
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(row_pointers[y][x*xadd*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,filename);
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/* bottom color */
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color= (row_pointers[y+1][x*xadd*4]<<16)+
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(row_pointers[y+1][x*xadd*4+1]<<8)+
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(row_pointers[y+1][x*xadd*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,filename)<<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=ystart;y<height;y+=yadd) {
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for(x=0;x<width;x+=xadd) {
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if (bit_depth==8) {
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/* top color */
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a2_color=row_pointers[y][x];
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if (a2_color==16) {
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a2_color=10;
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}
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if (a2_color>16) {
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fprintf(stderr,"Error color %d\n",a2_color);
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}
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/* bottom color */
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color=row_pointers[y+(yadd/2)][x];
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if (color==16) {
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color=10;
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}
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if (color>16) {
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fprintf(stderr,"Error color %d\n",color);
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}
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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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else if (bit_depth==4) {
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/* top color */
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a2_color=row_pointers[y][x/2];
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if (x%2==0) {
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a2_color=(a2_color>>4);
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}
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a2_color&=0xf;
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/* bottom color */
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color=row_pointers[y+(yadd/2)][x/2];
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if (x%2==0) {
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color=(color>>4);
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}
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color&=0xf;
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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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}
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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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/* for 80 column mode or double-lores */
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int loadpng80(char *filename, unsigned char **image_ptr, int *xsize, int *ysize,
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int png_type) {
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int x,y,ystart,yadd,xadd;
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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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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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if (width==80) {
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*xsize=80;
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xadd=1;
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}
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else {
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fprintf(stderr,"Unsupported width %d\n",width);
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return -1;
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}
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if (png_type==PNG_WHOLETHING) {
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*ysize=height;
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ystart=0;
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yadd=2;
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}
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else if (png_type==PNG_ODDLINES) {
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*ysize=height/2;
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ystart=1;
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yadd=4;
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}
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else if (png_type==PNG_EVENLINES) {
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*ysize=height/2;
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ystart=0;
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yadd=4;
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}
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else {
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fprintf(stderr,"Unknown PNG type\n");
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return -1;
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}
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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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printf("Generating output size %d x %d\n",*xsize,*ysize);
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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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/* FIXME: do we ever free these? */
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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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/* FIXME: this should be 40x24 max??? */
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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=ystart;y<height;y+=yadd) {
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for(x=0;x<width;x+=xadd) {
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/* top color */
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color= (row_pointers[y][x*xadd*4]<<16)+
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(row_pointers[y][x*xadd*4+1]<<8)+
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(row_pointers[y][x*xadd*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,filename);
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/* bottom color */
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color= (row_pointers[y+1][x*xadd*4]<<16)+
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(row_pointers[y+1][x*xadd*4+1]<<8)+
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(row_pointers[y+1][x*xadd*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,filename)<<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=ystart;y<height;y+=yadd) {
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for(x=0;x<width;x+=xadd) {
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if (bit_depth==8) {
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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+(yadd/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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else if (bit_depth==4) {
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/* top color */
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a2_color=row_pointers[y][x/2];
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if (x%2==0) {
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a2_color=(a2_color>>4);
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}
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a2_color&=0xf;
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/* bottom color */
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color=row_pointers[y+(yadd/2)][x/2];
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if (x%2==0) {
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color=(color>>4);
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}
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color&=0xf;
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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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}
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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
|
|
0,0 0,1 0,2....0,39 16,0 16,1 ....16,39 32,0..32,39, X X X X X X X X
|
|
*/
|
|
|
|
*image_ptr=image;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|