diff options
Diffstat (limited to 'converter/pbm/cmuwmtopbm.c')
-rw-r--r-- | converter/pbm/cmuwmtopbm.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/converter/pbm/cmuwmtopbm.c b/converter/pbm/cmuwmtopbm.c new file mode 100644 index 00000000..dce1d449 --- /dev/null +++ b/converter/pbm/cmuwmtopbm.c @@ -0,0 +1,114 @@ +/* cmuwmtopbm.c - read a CMU window manager bitmap and produce a portable bitmap +** +** Copyright (C) 1989 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 "pbm.h" +#include "cmuwm.h" + +static void getinit ARGS(( FILE* file, int* colsP, int* rowsP, short* depthP, int* padrightP )); +static bit getbit ARGS(( FILE* file )); + +int +main( argc, argv ) + int argc; + char* argv[]; + { + FILE* ifp; + bit* bitrow; + register bit* bP; + int rows, cols, padright, row, col; + short depth; + + + pbm_init( &argc, argv ); + + if ( argc > 2 ) + pm_usage( "[cmuwmfile]" ); + + if ( argc == 2 ) + ifp = pm_openr( argv[1] ); + else + ifp = stdin; + + getinit( ifp, &cols, &rows, &depth, &padright ); + if ( depth != 1 ) + pm_error( + "CMU window manager file has depth of %d, must be 1", + (int) depth ); + + pbm_writepbminit( stdout, cols, rows, 0 ); + bitrow = pbm_allocrow( cols ); + + for ( row = 0; row < rows; ++row ) + { + /* Get data. */ + for ( col = 0, bP = bitrow; col < cols; ++col, ++bP ) + *bP = getbit( ifp ); + /* Discard line padding */ + for ( col = 0; col < padright; ++col ) + (void) getbit( ifp ); + pbm_writepbmrow( stdout, bitrow, cols, 0 ); + } + + pm_close( ifp ); + pm_close( stdout ); + + exit( 0 ); + } + +static int item, bitsperitem, bitshift; + +static void +getinit( file, colsP, rowsP, depthP, padrightP ) + FILE* file; + int* colsP; + int* rowsP; + short* depthP; + int* padrightP; + { + long l; + + if ( pm_readbiglong( file, &l ) == -1 ) + pm_error( "EOF / read error" ); + if ( l != CMUWM_MAGIC ) + pm_error( "bad magic number in CMU window manager file" ); + if ( pm_readbiglong( file, &l ) == -1 ) + pm_error( "EOF / read error" ); + *colsP = (int) l; + if ( pm_readbiglong( file, &l ) == -1 ) + pm_error( "EOF / read error" ); + *rowsP = (int) l; + if ( pm_readbigshort( file, depthP ) == -1 ) + pm_error( "EOF / read error" ); + *padrightP = ( ( *colsP + 7 ) / 8 ) * 8 - *colsP; + + bitsperitem = 0; + } + +static bit +getbit( file ) + FILE* file; + { + bit b; + + if ( bitsperitem == 0 ) + { + item = getc( file ); + if ( item == EOF ) + pm_error( "EOF / read error" ); + bitsperitem = 8; + bitshift = 7; + } + b = ( ( item >> bitshift) & 1 ) ? PBM_WHITE : PBM_BLACK; + --bitsperitem; + --bitshift; + return b; + } |