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- /* ppmtopuzz.c - read a portable pixmap and write an X11 "puzzle" file
- **
- ** Copyright (C) 1991 by Jef Poskanzer.
- **
- ** 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.
- */
-
- #include "ppm.h"
- #include "ppmcmap.h"
-
- #define MAXVAL 255
- #define MAXCOLORS 256
-
- int
- main( argc, argv )
- int argc;
- char* argv[];
- {
- FILE* ifp;
- pixel** pixels;
- register pixel* pP;
- colorhist_vector chv;
- colorhash_table cht;
- int rows, cols, row, colors, i;
- register int col;
- pixval maxval;
-
-
- ppm_init( &argc, argv );
-
- if ( argc > 2 )
- pm_usage( "[ppmfile]" );
-
- if ( argc == 2 )
- ifp = pm_openr( argv[1] );
- else
- ifp = stdin;
-
- pixels = ppm_readppm( ifp, &cols, &rows, &maxval );
- pm_close( ifp );
-
- pm_message( "computing colormap..." );
- chv = ppm_computecolorhist( pixels, cols, rows, MAXCOLORS, &colors );
- if ( chv == (colorhist_vector) 0 )
- {
- pm_message(
- "too many colors - try doing a 'ppmquant %d'", MAXCOLORS );
- exit( 1 );
- }
- pm_message( "%d colors found", colors );
-
- /* Write puzzle header. */
- (void) pm_writebiglong( stdout, cols );
- (void) pm_writebiglong( stdout, rows );
- (void) putchar( (unsigned char) colors );
- if ( maxval > MAXVAL )
- pm_message(
- "maxval is not %d - automatically rescaling colors", MAXVAL );
- for ( i = 0; i < colors; ++i )
- {
- pixel p;
-
- p = chv[i].color;
- if ( maxval != MAXVAL )
- PPM_DEPTH( p, p, maxval, MAXVAL );
- (void) putchar( (unsigned char) PPM_GETR( p ) );
- (void) putchar( (unsigned char) PPM_GETG( p ) );
- (void) putchar( (unsigned char) PPM_GETB( p ) );
- }
-
- /* Convert color vector to color hash table, for fast lookup. */
- cht = ppm_colorhisttocolorhash( chv, colors );
- ppm_freecolorhist( chv );
-
- /* And write out the data. */
- for ( row = 0; row < rows; ++row )
- {
- for ( col = 0, pP = pixels[row]; col < cols; ++col, ++pP )
- {
- register int color;
-
- color = ppm_lookupcolor( cht, pP );
- if ( color == -1 )
- pm_error(
- "color not found?!? row=%d col=%d r=%d g=%d b=%d",
- row, col, PPM_GETR(*pP), PPM_GETG(*pP), PPM_GETB(*pP) );
- (void) putchar( (unsigned char) color );
- }
- }
-
- exit( 0 );
- }
-