Converting XImage to PNG Post: 302481361

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Top Forums Programming Converting XImage to PNG Post 302481361 by fpmurphy on Friday 17th of December 2010 09:33:37 AM

12-17-2010

Registered User

Sure, lots out there. Koders.com is your friend for source code. Better than Google. For example here is how to convert to PNM format. Part of xgame/ximages.c.

Code:

save_ximage_pnm(XImage *img,char *pnmname,int type) {
	int x,y;
	unsigned long pixel;
	FAIL_ON(!img || !pnmname || type<=0, "bad argument(s)"); 

	fprintf(stdout,"P%d\n%d %d\n255\n",type,img->width, img->height);
	for (y=0; y<img->height; y++) {
		for (x=0; x<img->width; x++) {
			pixel=XGetPixel(img,x,y);
			if (type==ASCII_PPM) {
				fprintf(stdout,"%ld %ld %ld\n",
						pixel>>16,(pixel&0x00ff00)>>8,pixel&0x0000ff);
			} else if (type==BINARY_PPM) {
				fprintf(stdout,"%c%c%c",
					(char)(pixel>>16),
					(char)((pixel&0x00ff00)>>8),
					(char)(pixel&0x0000ff) );

			} else {
				fprintf(stderr,"PnM type %d not supported!",type);
				return(0);
			}
		}
	}
	return(1);
}

Once your image is in PNM format, it is easy to convert to most other formats.

If you use the Firefox web browser, you can add a domain specific searchbar to help with source code searches. See https://addons.mozilla.org/en-US/fir...koders&cat=all

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LEARN ABOUT DEBIAN

img-xpm

img-xpm(3tk)															      img-xpm(3tk)

NAME

       img-xpm - Img, X Windows Pixmap Format (xpm)

SYNOPSIS

       package require Tk

       package require img::xpm  ?1.3?

       image create photo ?name? ?options?

DESCRIPTION

       The  package  img::xpm  is a sub-package of Img. It can be loaded as a part of the complete Img support, via package require Img, or on its
       own, via package require img::xpm.

       Like all packages of Img it does not provide new commands, but extends the existing Tk command image so that it supports  files	containing
       raster images in the X Windows Pixmap Format (xpm). More specifically img::xpm extends Tk's photo image type.

       The name of the new format handler is xpm.  This handler does not provide additional configuration options.

       All of the above means that in a call like

       image create photo ?name? ?options?

       [1]    Image data in xpm format (options -data and -file) is detected automatically.

       [2]    The format name xpm is recognized by the option -format.

SEE ALSO

       img-bmp,  img-gif,  img-ico,  img-intro, img-jpeg, img-pcx, img-pixmap, img-png, img-ppm, img-ps, img-sgi, img-sun, img-tga, img-tiff, img-
       window, img-xbm, img-xpm

KEYWORDS

       image handling, tk, xpm

COPYRIGHT

       Copyright (c) 1995-2003 Jan Nijtmans <nijtmans@users.sourceforge.com>

Img									1.3							      img-xpm(3tk)