libgd/src/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 of 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
 *
 *--------------------------------------------------------------------------
 */

/**
 * File: WBMP IO
 *
 * Read and write WBMP images.
 */

#ifdef HAVE_CONFIG_H
#	include "config.h"
#endif

#include "gd.h"
#include "gd_errors.h"
#include "gdfonts.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));
}

static int _gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out);

/*
	Function: gdImageWBMPCtx

	Write the image as a wbmp file

	Parameters:
		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
*/
BGD_DECLARE(void) gdImageWBMPCtx(gdImagePtr image, int fg, gdIOCtx *out)
{
	_gdImageWBMPCtx(image, fg, out);
}

/* returns 0 on success, 1 on failure */
static int _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\n");
		return 1;
	}

	/* 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)) {
		freewbmp(wbmp);
		gd_error("Could not save WBMP\n");
		return 1;
	}

	/* des submitted this bugfix: gdFree the memory. */
	freewbmp(wbmp);

	return 0;
}

/*
  Function: gdImageCreateFromWBMPCtx

  Reads in a WBMP image via a <gdIOCtx> struct.  See
  <gdImageCreateFromWBMP>.
*/
BGD_DECLARE(gdImagePtr) gdImageCreateFromWBMPCtx(gdIOCtx *infile)
{
	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;
}


/*
  Function: gdImageCreateFromWBMP

    <gdImageCreateFromWBMP> is called to load images from WBMP format
    files. Invoke <gdImageCreateFromWBMP> with an already opened
    pointer to a file containing the desired
    image. <gdImageCreateFromWBMP> returns a gdImagePtr to the new
    image, or NULL if unable to load the image (most often because the
    file is corrupt or does not contain a WBMP
    image). <gdImageCreateFromWBMP> does not close the file. You can
    inspect the sx and sy members of the image to determine its
    size. The image must eventually be destroyed using
    <gdImageDestroy>.

  Variants:

    <gdImageCreateFromWBMPPtr> creates an image from WBMP data (i.e. the
    contents of a WBMP file) already in memory.

    <gdImageCreateFromWBMPCtx> reads in an image using the functions in
    a <gdIOCtx> struct.

  Parameters:

    infile - The input FILE pointer

  Returns:

    A pointer to the new image or NULL if an error occurred.

  Example:
    (start code)

    gdImagePtr im;
    FILE *in;
    in = fopen("mywbmp.wbmp", "rb");
    im = gdImageCreateFromWBMP(in);
    fclose(in);
    // ... Use the image ...
    gdImageDestroy(im);

    (end code)
*/

BGD_DECLARE(gdImagePtr) gdImageCreateFromWBMP(FILE *inFile)
{
	gdImagePtr im;
	gdIOCtx *in = gdNewFileCtx(inFile);
	if (in == NULL) return NULL;
	im = gdImageCreateFromWBMPCtx(in);
	in->gd_free(in);
	return im;
}


/*
  Function: gdImageCreateFromWBMPPtr

  Parameters:

    size - size of WBMP data in bytes.
    data - WBMP data (i.e. contents of a WBMP file).

  See <gdImageCreateFromWBMP>.
*/
BGD_DECLARE(gdImagePtr) gdImageCreateFromWBMPPtr(int size, void *data)
{
	gdImagePtr im;
	gdIOCtx *in = gdNewDynamicCtxEx(size, data, 0);
	if(!in) {
		return 0;
	}
	im = gdImageCreateFromWBMPCtx(in);
	in->gd_free(in);
	return im;
}

/*
	Function: gdImageWBMP
*/
BGD_DECLARE(void) gdImageWBMP(gdImagePtr im, int fg, FILE *outFile)
{
	gdIOCtx *out = gdNewFileCtx(outFile);
	if (out == NULL) return;
	gdImageWBMPCtx(im, fg, out);
	out->gd_free(out);
}

/*
	Function: gdImageWBMPPtr
*/
BGD_DECLARE(void *) gdImageWBMPPtr(gdImagePtr im, int *size, int fg)
{
	void *rv;
	gdIOCtx *out = gdNewDynamicCtx(2048, NULL);
	if (out == NULL) return NULL;
	if (!_gdImageWBMPCtx(im, fg, out)) {
		rv = gdDPExtractData(out, size);
	} else {
		rv = NULL;
	}
	out->gd_free(out);
	return rv;
}