Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!agate!violet.berkeley.edu!izumi
From: izumi@violet.berkeley.edu (Izumi Ohzawa)
Newsgroups: comp.sys.next
Subject: Re: How do I display a byte image ???
Message-ID: <1989Sep2.235409.8890@agate.uucp>
Date: 2 Sep 89 23:54:09 GMT
References: <438@dftsrv.gsfc.nasa.gov> <11638@polya.Stanford.EDU>
Sender: usenet@agate.uucp (USENET Administrator;;;;ZU44)
Organization: University of California, Berkeley
Lines: 38

In article <11638@polya.Stanford.EDU> aozer@NeXT.com (Ali Ozer) writes:
>In article <438@dftsrv.gsfc.nasa.gov> Bob Cahalan writes:
>>help me with code?  The image is 1024X1024 8-bit pixels, and
>>the file has no header -- just 1024 bytes for line 1 followed
>>by 1024 bytes for line 2, etc to EOF, altogether 1 Megabyte.
>
>You can try appending a PS header on top of it and executing it
>in Yap. Here's a header that might work; it worked for me when I

Thanks Ali, but is there a way to use the `image` operator
in a PSWRAPped function which can receive a pointer to
binary image data directly?

I think Bob's image file contains a straight binary image.
For occasional viewing, your method of viewing with Yap will
work well.  However, it seems that I should be able to use
a pswrapped function of the form:

defineps displayBinaryImage(
	    float x, y, width, height;
	    int xnum_pixels, ynum_pixels; int bits_per_pixel;
	    unsigned char *imagedata)

 ..... 
endps

which will diplay the binary image pointed to by imagedata
into a rectangle of 'width' and 'height' with its lower left
corner at (x,y).

I know that 'image' operator takes a procedure which leaves
a (HEX ASCII) string on stack as its last argument, but I am
asking if it is possible to directly pass a pointer to
binary image data.

Is this possible?

Izumi Ohzawa, izumi@violet.berkeley.edu