1 files changed, 104 insertions, 0 deletions
diff --git a/converter/ppm/neotoppm.c b/converter/ppm/neotoppm.c
new file mode 100644
index 00000000..d8cf2918
--- /dev/null
+++ b/converter/ppm/neotoppm.c
@@ -0,0 +1,104 @@
+/* neotoppm.c - read a Neochrome NEO file and produce a portable pixmap
+**
+** Copyright (C) 2001 by Teemu Hukkanen <tjhukkan@iki.fi>
+**  Based on pi1toppm by Steve Belczyk (seb3@gte.com) and 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 ROWS 200
+#define COLS 320
+#define MAXVAL 7
+
+static short screen[ROWS*COLS/4];        /* simulates the Atari's video RAM */
+
+int
+main( int argc, char * argv[] ) {
+    FILE* ifp;
+    pixel pal[16];                      /* Degas palette */
+    pixel* pixelrow;
+    int row;
+
+    ppm_init( &argc, argv );
+
+    /* Check args. */
+    if ( argc > 2 )
+        pm_usage( "[neofile]" );
+
+    if ( argc == 2 )
+        ifp = pm_openr( argv[1] );
+    else
+        ifp = stdin;
+
+    /* Check header */
+    {
+        /* Flag */
+        short j;
+        pm_readbigshort (ifp, &j);
+        if ( j != 0 )
+            pm_error( "not a NEO file" );
+    }
+    {
+        /* Check resolution word */
+        short j;
+        pm_readbigshort (ifp, &j);
+        if ( j != 0 )
+            pm_error( "not a NEO file" );
+    }
+    {
+        int i;
+        /* Read the palette. */
+        for ( i = 0; i < 16; ++i ) {
+            short j;
+            
+            pm_readbigshort (ifp, &j);
+            PPM_ASSIGN( pal[i],
+                        ( j & 0x700 ) >> 8,
+                        ( j & 0x070 ) >> 4,
+                        ( j & 0x007 ) );
+        }
+    }
+
+    /* Skip rest of header */
+    fseek(ifp, 128, SEEK_SET);
+
+    {
+        /* Read the screen data */
+        int i;
+        for ( i = 0; i < ROWS*COLS/4; ++i )
+            pm_readbigshort( ifp, &screen[i] );
+    }
+    pm_close( ifp );
+
+    /* Ok, get set for writing PPM. */
+    ppm_writeppminit( stdout, COLS, ROWS, MAXVAL, 0 );
+    pixelrow = ppm_allocrow( COLS );
+
+    /* Now do the conversion. */
+    for ( row = 0; row < ROWS; ++row ) {
+        int col;
+        for ( col = 0; col < COLS; ++col ) {
+            int c, ind, b, plane;
+
+            ind = 80 * row + ( ( col >> 4 ) << 2 );
+            b = 0x8000 >> ( col & 0xf );
+            c = 0;
+            for ( plane = 0; plane < 4; ++plane )
+                if ( b & screen[ind+plane] )
+                    c |= (1 << plane);
+            pixelrow[col] = pal[c];
+        }
+        ppm_writeppmrow( stdout, pixelrow, COLS, MAXVAL, 0 );
+    }
+
+    pm_close( stdout );
+
+    exit( 0 );
+}