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- /* pnmtorast.c - read a portable anymap and produce a Sun rasterfile
- **
- ** Copyright (C) 1989, 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 "pnm.h"
- #include "rast.h"
-
- #include "ppmcmap.h"
- #define MAXCOLORS 256
- static colormap_t* make_pr_colormap ARGS(( colorhist_vector chv, int colors ));
- static colormap_t* make_gray_pr_colormap ARGS(( void ));
- static colormap_t* alloc_pr_colormap ARGS(( void ));
-
- int
- main( argc, argv )
- int argc;
- char* argv[];
- {
- FILE* ifp;
- xel** xels;
- xel* xelrow;
- xel p;
- register xel* xP;
- colorhist_vector chv;
- colorhash_table cht;
- colormap_t* pr_colormapP;
- int argn, pr_type, rows, cols, format, i;
- int depth, colors, linesize, row;
- register int col, bitcount;
- xelval maxval;
- struct pixrect* pr;
- unsigned char* data;
- register unsigned char* byteP;
- char* usage = "[-standard|-rle] [pnmfile]";
-
- pnm_init( &argc, argv );
-
- argn = 1;
- pr_type = RT_BYTE_ENCODED;
-
- while ( argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0' )
- {
- if ( pm_keymatch( argv[argn], "-standard", 2 ) )
- pr_type = RT_STANDARD;
- else if ( pm_keymatch( argv[argn], "-rle", 2 ) )
- pr_type = RT_BYTE_ENCODED;
- else
- pm_usage( usage );
- ++argn;
- }
-
- if ( argn != argc )
- {
- ifp = pm_openr( argv[argn] );
- ++argn;
- }
- else
- ifp = stdin;
-
- if ( argn != argc )
- pm_usage( usage );
-
- xels = pnm_readpnm( ifp, &cols, &rows, &maxval, &format );
-
- pm_close( ifp );
-
- /* Figure out the proper depth and colormap. */
- switch ( PNM_FORMAT_TYPE(format) )
- {
- case PPM_TYPE:
- pm_message( "computing colormap..." );
- chv = ppm_computecolorhist( xels, cols, rows, MAXCOLORS, &colors );
- if ( chv == (colorhist_vector) 0 )
- {
- pm_message(
- "Too many colors - proceeding to write a 24-bit non-mapped" );
- pm_message(
- "rasterfile. If you want 8 bits, try doing a 'ppmquant %d'.",
- MAXCOLORS );
- depth = 24;
- pr_type = RT_STANDARD;
- pr_colormapP = (colormap_t*) 0;
- }
- else
- {
- pm_message( "%d colors found", colors );
-
- if ( maxval != 255 )
- for ( i = 0; i < colors; ++i )
- PPM_DEPTH( chv[i].color, chv[i].color, maxval, 255 );
-
- /* Force white to slot 0 and black to slot 1, if possible. */
- PPM_ASSIGN( p, 255, 255, 255 );
- ppm_addtocolorhist( chv, &colors, MAXCOLORS, &p, 0, 0 );
- PPM_ASSIGN( p, 0, 0, 0 );
- ppm_addtocolorhist( chv, &colors, MAXCOLORS, &p, 0, 1 );
-
- if ( colors == 2 )
- {
- /* Monochrome. */
- depth = 1;
- pr_colormapP = (colormap_t*) 0;
- }
- else
- {
- /* Turn the ppm colormap into the appropriate Sun colormap. */
- depth = 8;
- pr_colormapP = make_pr_colormap( chv, colors );
- }
- cht = ppm_colorhisttocolorhash( chv, colors );
- ppm_freecolorhist( chv );
- }
-
- break;
-
- case PGM_TYPE:
- depth = 8;
- pr_colormapP = make_gray_pr_colormap( );
- break;
-
- default:
- depth = 1;
- pr_colormapP = (colormap_t*) 0;
- break;
- }
-
- if ( maxval > 255 && depth != 1 )
- pm_message(
- "maxval is not 255 - automatically rescaling colors" );
-
- /* Allocate space for the Sun-format image. */
- if ( (pr = mem_create(cols, rows, depth)) == (struct pixrect*) 0 )
- pm_error( "unable to create new pixrect" );
- data = ( (struct mpr_data*) pr->pr_data )->md_image;
- linesize = ( (struct mpr_data*) pr->pr_data )->md_linebytes;
-
- /* And compute the Sun image. The variables at this point are:
- ** cht is null or not
- ** depth is 1, 8, or 24
- */
- for ( row = 0; row < rows; ++row )
- {
- xelrow = xels[row];
- byteP = data;
- switch ( depth )
- {
- case 1:
- *byteP = 0;
- bitcount = 7;
- for ( col = 0, xP = xelrow; col < cols; ++col, ++xP )
- {
- register int color;
-
- switch ( PNM_FORMAT_TYPE(format) )
- {
- case PPM_TYPE:
- if ( maxval != 255 )
- PPM_DEPTH( *xP, *xP, maxval, 255 );
- color = ppm_lookupcolor( cht, xP );
- if ( color == -1 )
- pm_error(
- "color not found?!? row=%d col=%d r=%d g=%d b=%d",
- row, col, PPM_GETR(*xP), PPM_GETG(*xP),
- PPM_GETB(*xP) );
- if ( color )
- *byteP |= 1 << bitcount;
- break;
-
- default:
- color = PNM_GET1( *xP );
- if ( ! color )
- *byteP |= 1 << bitcount;
- break;
- }
- --bitcount;
- if ( bitcount < 0 )
- {
- ++byteP;
- *byteP = 0;
- bitcount = 7;
- }
- }
- break;
-
- case 8:
- for ( col = 0, xP = xelrow; col < cols; ++col, ++xP )
- {
- register int color;
-
- switch ( PNM_FORMAT_TYPE(format) )
- {
- case PPM_TYPE:
- if ( maxval != 255 )
- PPM_DEPTH( *xP, *xP, maxval, 255 );
- color = ppm_lookupcolor( cht, xP );
- if ( color == -1 )
- pm_error(
- "color not found?!? row=%d col=%d r=%d g=%d b=%d",
- row, col, PPM_GETR(*xP), PPM_GETG(*xP),
- PPM_GETB(*xP) );
- break;
-
- case PGM_TYPE:
- color = PNM_GET1( *xP );
- if ( maxval != 255 )
- color = color * 255 / maxval;
- break;
-
- default:
- color = PNM_GET1( *xP );
- }
- *byteP++ = color;
- }
- break;
-
- case 24:
- /* If depth is 24, we do NOT have a valid cht. */
- for ( col = 0, xP = xelrow; col < cols; ++col, ++xP )
- {
- if ( maxval != 255 )
- PPM_DEPTH( *xP, *xP, maxval, 255 );
- *byteP++ = PPM_GETB( *xP );
- *byteP++ = PPM_GETG( *xP );
- *byteP++ = PPM_GETR( *xP );
- }
- break;
-
- default:
- pm_error( "can't happen" );
- }
- data += linesize;
- }
- pnm_freearray( xels, rows );
-
- /* Finally, write the sucker out. */
- if ( pr_dump( pr, stdout, pr_colormapP, pr_type, 0 ) == PIX_ERR )
- pm_error( "error writing rasterfile" );
-
- exit( 0 );
- }
-
- static colormap_t*
- make_pr_colormap( chv, colors )
- colorhist_vector chv;
- int colors;
- {
- colormap_t* pr_colormapP;
- int i;
-
- pr_colormapP = alloc_pr_colormap( );
-
- for ( i = 0; i < colors; ++i )
- {
- pr_colormapP->map[0][i] = PPM_GETR( chv[i].color );
- pr_colormapP->map[1][i] = PPM_GETG( chv[i].color );
- pr_colormapP->map[2][i] = PPM_GETB( chv[i].color );
- }
- for ( ; i < MAXCOLORS; ++i )
- pr_colormapP->map[0][i] = pr_colormapP->map[1][i] =
- pr_colormapP->map[2][i] = 0;
-
- return pr_colormapP;
- }
-
- static colormap_t*
- make_gray_pr_colormap( )
- {
- colormap_t* pr_colormapP;
- int i;
-
- pr_colormapP = alloc_pr_colormap( );
-
- for ( i = 0; i < MAXCOLORS; ++i )
- {
- pr_colormapP->map[0][i] = i;
- pr_colormapP->map[1][i] = i;
- pr_colormapP->map[2][i] = i;
- }
-
- return pr_colormapP;
- }
-
- static colormap_t*
- alloc_pr_colormap( )
- {
- colormap_t* pr_colormapP;
-
- pr_colormapP = (colormap_t*) malloc( sizeof(colormap_t) );
- if ( pr_colormapP == (colormap_t*) 0 )
- pm_error( "out of memory" );
- pr_colormapP->type = RMT_EQUAL_RGB;
- pr_colormapP->length = MAXCOLORS;
- pr_colormapP->map[0] =
- (unsigned char*) malloc( MAXCOLORS * sizeof(unsigned char) );
- pr_colormapP->map[1] =
- (unsigned char*) malloc( MAXCOLORS * sizeof(unsigned char) );
- pr_colormapP->map[2] =
- (unsigned char*) malloc( MAXCOLORS * sizeof(unsigned char) );
- if ( pr_colormapP->map[0] == 0 || pr_colormapP->map[1] == 0 ||
- pr_colormapP->map[2] == 0 )
- pm_error( "out of memory" );
-
- return pr_colormapP;
- }
-