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gd-libgd / src / gd_wbmp.c

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/*
   	WBMP: Wireless Bitmap Type 0: B/W, Uncompressed Bitmap
   	Specification of the WBMP format can be found in the file: 
	SPEC-WAESpec-19990524.pdf
   	You can download the WAP specification on: http://www.wapforum.com/ 

   	gd_wbmp.c

   	Copyright (C) Johan Van den Brande (johan@vandenbrande.com)
   
	Fixed: gdImageWBMPPtr, gdImageWBMP

   	Recoded: gdImageWBMPCtx for use with my wbmp library
	(wbmp library included, but you can find the latest distribution
	 at http://www.vandenbrande.com/wbmp)

	Implemented: gdImageCreateFromWBMPCtx, gdImageCreateFromWBMP 

   	---------------------------------------------------------------------------

   	Parts of this code are from Maurice Smurlo.


   	** Copyright (C) Maurice Szmurlo --- T-SIT --- January 2000
   	** (Maurice.Szmurlo@info.unicaen.fr)

   	** 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.

   	---------------------------------------------------------------------------
   	Parts od this code are inspired by  'pbmtowbmp.c' and 'wbmptopbm.c' by 
   	Terje Sannum <terje@looplab.com>.
   	**
   	** 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.
   	**
   	---------------------------------------------------------------------------

   	Todo:

   	gdCreateFromWBMP function for reading WBMP files

   	----------------------------------------------------------------------------
*/

#include <gdfonts.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>

#include "gd.h"
#include "wbmp.h"


/* gd_putout
** ---------
** Wrapper around gdPutC for use with writewbmp
**
*/
int gd_putout( int i, void * out )
{
    gdPutC( i , (gdIOCtx *) out );
}   


/* gd_getin
** --------
** Wrapper around gdGetC for use with readwbmp
**
*/
int gd_getin( void *in )
{
	return( gdGetC( ( gdIOCtx *) in ) );
}


/*	gdImageWBMPCtx
**  --------------
**  Write the image as a wbmp file
**  Parameters are:
**  image:  gd image structure;
**  fg:     the index of the foreground color. any other value will be 
**          considered as background and will not be written
**  out:    the stream where to write
*/
void gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out) {
  
  	int 	x, y, pos;
    Wbmp 	*wbmp;


	/* create the WBMP */
	if ( (wbmp = createwbmp( gdImageSX(image), gdImageSY(image), WBMP_WHITE)) == NULL )
		fprintf(stderr, "Could not create WBMP\n");

  	/* fill up the WBMP structure */
	pos = 0;  
	for(y=0; y<gdImageSY(image); y++) 
	{
		for(x=0; x<gdImageSX(image); x++) 
		{
	  		if(gdImageGetPixel(image, x, y) == fg) 
			{
				wbmp->bitmap[pos] = WBMP_BLACK; 
	  		}
			pos++;
	  	}
	}

	/* write the WBMP to a gd file descriptor */		
	if ( writewbmp( wbmp, &gd_putout, out ) )
		fprintf(stderr, "Could not save WBMP\n");
	/* des submitted this bugfix: free the memory. */
	freewbmp(wbmp);
}


/* gdImageCreateFromWBMPCtx
** ------------------------
** Create a gdImage from a WBMP file input from an gdIOCtx
*/
gdImagePtr	gdImageCreateFromWBMPCtx( gdIOCtx *infile )
{
	FILE *wbmp_file;
	Wbmp *wbmp;
    gdImagePtr im = NULL; 
	int black, white;
	int col, row, pos;

	if ( readwbmp( &gd_getin, infile, &wbmp ) )
		return (NULL);

    if (!(im = gdImageCreate(wbmp->width, wbmp->height)))
	{
    	freewbmp( wbmp );
		return (NULL);   	
	}

	/* create the background color */
	white = gdImageColorAllocate(im, 255, 255, 255);
	/* create foreground color */
	black = gdImageColorAllocate(im, 0,   0,   0);

	/* fill in image (in a wbmp 1 = white/ 0 = black) */
	pos = 0;
	for(row=0; row<wbmp->height; row++)
	{
		for(col=0; col<wbmp->width; col++)
		{
			if (wbmp->bitmap[pos++] == WBMP_WHITE)
			{
				gdImageSetPixel(im, col, row, white);		
			}
			else
			{
				gdImageSetPixel(im, col, row, black);
			}
		}
	}	

	freewbmp( wbmp );	

	return(im);
}


/* gdImageCreateFromWBMP
** ---------------------
*/
gdImagePtr gdImageCreateFromWBMP( FILE *inFile )
{
	gdImagePtr	im;
	gdIOCtx *in = gdNewFileCtx( inFile );
	im = gdImageCreateFromWBMPCtx( in );
	in->free(in);
	return (im);
}

/* gdImageWBMP
** -----------
*/
void gdImageWBMP(gdImagePtr im, int fg, FILE *outFile)
{
	gdIOCtx *out = gdNewFileCtx(outFile);
	gdImageWBMPCtx(im, fg, out);
	out->free(out);
}

/* gdImageWBMPPtr
** --------------
*/
void *gdImageWBMPPtr(gdImagePtr im, int *size, int fg)
{
        void *rv;
        gdIOCtx *out = gdNewDynamicCtx(2048, NULL);
        gdImageWBMPCtx(im, fg, out);
        rv = gdDPExtractData(out, size);
        out->free(out);
        return rv;
}