gd_wbmp.c

/*
   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 <gd.h>
#include <gdfonts.h>
#include <gd_errors.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>

#include "wbmp.h"


/* gd_putout
   ** ---------
   ** Wrapper around gdPutC for use with writewbmp
   **
 */
void 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) {
		gd_error("Could not create WBMP");
	}

	/* 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)) {
		gd_error("Could not save WBMP");
	}
	/* des submitted this bugfix: gdFree 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->gd_free(in);

	return im;
}

gdImagePtr gdImageCreateFromWBMPPtr (int size, void *data)
{
	gdImagePtr im;
	gdIOCtx *in = gdNewDynamicCtxEx(size, data, 0);
	im = gdImageCreateFromWBMPCtx(in);
	in->gd_free(in);
	return im;
}

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

	return rv;
}