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/* ppmtoleaf.c - read a portable pixmap and produce a ileaf img file
*
* Copyright (C) 1994 by Bill O'Donnell.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. This software is provided "as is" without express or
* implied warranty.
*
* Known problems: pgms are not converted to leaf grayscales; they are
* converted to 8-bit color images with all gray for colors.
*
*/
#include <stdio.h>
#include "ppm.h"
#define MAXCOLORS 256
pixel **pixels;
colorhash_table cht;
int Red[MAXCOLORS], Green[MAXCOLORS], Blue[MAXCOLORS];
static int
colorstobpp( colors )
int colors;
{
int bpp;
if ( colors <= 2 )
bpp = 1;
else if ( colors <= 256 )
bpp = 8;
else
bpp = 24;
return bpp;
}
static int
GetPixel( x, y )
int x, y;
{
int color;
color = ppm_lookupcolor( cht, &pixels[y][x] );
return color;
}
/* OK, this routine is not wicked efficient, but it is simple to follow
and it works. */
static void
leaf_writeimg(width, height, depth, ncolors, maxval)
int width;
int height;
int depth;
int ncolors;
{
int i,row,col;
/* NOTE: byte order in ileaf img file fmt is big-endian, always! */
/* magic */
fputc(0x89, stdout);
fputc(0x4f, stdout);
fputc(0x50, stdout);
fputc(0x53, stdout);
/* version 4 */
fputc(0x00, stdout);
fputc(0x04, stdout);
/* h resolution: pixels/inch: say 75=screen resolution */
fputc(0x00, stdout);
fputc(75, stdout);
/* v resolution: pixels/inch: say 75=screen resolution */
fputc(0x00, stdout);
fputc(75, stdout);
/* unique id, could be anything */
fputc(0x01, stdout);
fputc(0x02, stdout);
fputc(0x03, stdout);
fputc(0x04, stdout);
/* x offset, always zero */
fputc(0x00, stdout);
fputc(0x00, stdout);
/* y offset, always zero */
fputc(0x00, stdout);
fputc(0x00, stdout);
/* dimensions 64k x 64k max */
fputc((unsigned char)((width >> 8) & 0x00ff), stdout);
fputc((unsigned char)(width & 0x00ff), stdout);
fputc((unsigned char)((height >> 8) & 0x00ff), stdout);
fputc((unsigned char)(height & 0x00ff), stdout);
/* depth */
fputc(0x00, stdout);
fputc((unsigned char)depth, stdout);
/* compressed, 0=uncompressed, 1=compressed */
fputc(0x00, stdout);
/* format, mono/gray = 0x20000000, RGB=0x29000000 */
if (depth == 1)
fputc(0x20, stdout);
else
fputc(0x29, stdout);
fputc(0x00, stdout);
fputc(0x00, stdout);
fputc(0x00, stdout);
/* colormap size */
if (depth == 8)
{
fputc((unsigned char)((ncolors >> 8) & 0x00ff), stdout);
fputc((unsigned char)(ncolors & 0x00ff), stdout);
for (i=0; i<256; i++)
fputc((unsigned char) Red[i]*255/maxval, stdout);
for (i=0; i<256; i++)
fputc((unsigned char) Green[i]*255/maxval, stdout);
for (i=0; i<256; i++)
fputc((unsigned char) Blue[i]*255/maxval, stdout);
for (row=0; row<height; row++)
{
for (col=0; col<width; col++)
fputc(GetPixel(col, row), stdout);
if (width % 2)
fputc(0x00, stdout); /* pad to 2-bytes */
}
} else if (depth == 1) {
/* mono image */
/* no colormap */
fputc(0x00, stdout);
fputc(0x00, stdout);
for (row=0; row<height; row++)
{
unsigned char bits = 0;
for (col=0; col<width; col++) {
if (GetPixel(col,row))
bits |= (unsigned char) (0x0080 >> (col % 8));
if (((col + 1) % 8) == 0) {
fputc(bits, stdout);
bits = 0;
}
}
if ((width % 8) != 0)
fputc(bits, stdout);
if ((width % 16) && (width % 16) <= 8)
fputc(0x00, stdout); /* 16 bit pad */
}
} else {
/* no colormap, direct or true color (24 bit) image */
fputc(0x00, stdout);
fputc(0x00, stdout);
for (row=0; row<height; row++)
{
for (col=0; col<width; col++)
fputc(pixels[row][col].r * 255 / maxval, stdout);
if (width % 2)
fputc(0x00, stdout); /* pad to 2-bytes */
for (col=0; col<width; col++)
fputc(pixels[row][col].g * 255 / maxval, stdout);
if (width % 2)
fputc(0x00, stdout); /* pad to 2-bytes */
for (col=0; col<width; col++)
fputc(pixels[row][col].b * 255 / maxval, stdout);
if (width % 2)
fputc(0x00, stdout); /* pad to 2-bytes */
}
}
}
int
main( argc, argv )
int argc;
char *argv[];
{
FILE *ifd;
int argn, rows, cols, colors, i, BitsPerPixel;
pixval maxval;
colorhist_vector chv;
const char * const usage = "[ppmfile]";
ppm_init(&argc, argv);
argn = 1;
if ( argn < argc )
{
ifd = pm_openr( argv[argn] );
argn++;
} else
ifd = stdin;
if ( argn != argc )
pm_usage( usage );
pixels = ppm_readppm( ifd, &cols, &rows, &maxval );
pm_close( ifd );
/* Figure out the colormap. */
fprintf( stderr, "(Computing colormap..." );
fflush( stderr );
chv = ppm_computecolorhist( pixels, cols, rows, MAXCOLORS, &colors );
if ( chv != (colorhist_vector) 0 )
{
fprintf( stderr, " Done. %d colors found.)\n", colors );
for ( i = 0; i < colors; i++ )
{
Red[i] = (int) PPM_GETR( chv[i].color );
Green[i] = (int) PPM_GETG( chv[i].color );
Blue[i] = (int) PPM_GETB( chv[i].color );
}
BitsPerPixel = colorstobpp( colors );
/* And make a hash table for fast lookup. */
cht = ppm_colorhisttocolorhash( chv, colors );
ppm_freecolorhist( chv );
} else {
BitsPerPixel = 24;
fprintf( stderr, " Done. 24-bit true color %d color image.)\n", colors );
}
leaf_writeimg(cols, rows, BitsPerPixel, colors, maxval);
return( 0 );
}
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