1 files changed, 96 insertions, 0 deletions
diff --git a/converter/ppm/ppmtopuzz.c b/converter/ppm/ppmtopuzz.c
new file mode 100644
index 00000000..1277cc20
--- /dev/null
+++ b/converter/ppm/ppmtopuzz.c
@@ -0,0 +1,96 @@
+/* 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"
+
+#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 'pnmquant %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 );
+    }