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-.TH PICFILE 3X
-.CT graphics files
-.SH NAME
-picopen_r, picopen_w, picread, picwrite, picclose, picputprop, picgetprop, picunpack, picpack, picerror \- picture file I/O
-.SH SYNOPSIS
-.nf
-.B #include <picfile.h>
-.PP
-.B PICFILE *picopen_r(name)
-.B char *name;
-.PP
-.B "PICFILE *picopen_w(name, type, x0, y0, w, h, chan, argv, cmap)
-.B "char *name, *type, *chan, *argv[], *cmap;
-.PP
-.B int picread(pf, buf)
-.B PICFILE *pf;
-.B char *buf;
-.PP
-.B int picwrite(pf, buf)
-.B PICFILE *pf;
-.B char *buf;
-.PP
-.B void picclose(pf)
-.B PICFILE *pf;
-.PP
-.B PICFILE *picputprop(pf, name, value)
-.B PICFILE *pf;
-.B char *name, *value;
-.PP
-.B char *picgetprop(pf, name)
-.B PICFILE *pf;
-.B char *name;
-.PP
-.B "void picunpack(pf, pix, fmt, arg ...)
-.B PICFILE *pf;
-.B char *pix, *fmt;
-.PP
-.B "void picpack(pf, pix, fmt, arg ...)
-.B PICFILE *pf;
-.B char *pix, *fmt;
-.PP
-.B "void picerror(string)
-.B char *string;
-.fi
-.SH DESCRIPTION
-These functions read and write raster images in
-.IR picfile (5)
-format.
-They are loaded by option
-.B -lpicfile
-of
-.IR ld (1).
-Open picture files are referred to by pointers of type
-.BR PICFILE* .
-.PP
-.I Picopen_r
-opens the named picfile for reading and returns a pointer
-to the open file.
-If
-.I name
-is
-.L
-"IN"\fR,
-standard input is used.
-.PP
-.I Picopen_w
-similarly creates the named image file for writing.
-The name
-.L
-"OUT"
-refers to standard output.
-.I Type
-is a
-.B TYPE
-attribute, as described in
-.IR picfile (5);
-.I x0
-and
-.I y0
-are the upper left coordinates of the
-.BR WINDOW 
-attribute;
-.I w
-and
-.I h
-are the image width and heigth in pixels.
-.I Chan
-is a string specifying the order of channels for the
-.B CHAN
-attribute; the length of this string becomes the value of
-.BR NCHAN .
-.I Argv,
-if nonzero, is
-conventionally the second argument of the main program;
-see
-.IR exec (2).
-It becomes a 
-.B COMMAND
-attribute recording the provenance of the file.
-.PP
-The special call
-.B picopen_w(name, PIC_SAMEARGS(pf))
-creates a file with the same attributes as an already open
-picfile.
-.B PIC_SAMEARGS
-mentions
-.I argv
-by name, hence the name must be visible at the point of call.
-.PP
-.I Picread
-and
-.I picwrite
-read or write a single row of pixels using the
-character array
-.I buf.
-The length of the row is determined from the file's
-.B WINDOW
-and
-.B NCHAN
-attributes.
-One-bit-per-pixel images (of type
-.B bitmap
-or
-.BR ccitt-g4 ,
-for example)
-are decoded to one byte per pixel, 0 for black, 255 for white, and
-are encoded as 1 for pixel values less than 128 and 0 otherwise.
-Files of type
-.B ccir601
-are decoded into conventional
-.B rgb
-channels.
-.PP
-.I Picclose
-closes a picfile and frees associated storage.
-.PP
-.I Picputprop
-called after 
-.I picopen_w
-but before
-.I picwrite
-adds header attributes, returning a (probably changed) value of the 
-.B PICFILE
-pointer.
-.PP
-.I Picgetprop
-returns a pointer to the value of the named attribute, or
-0 if the picfile does not have the attribute.
-In both
-.I Picputprop
-and
-.I picgetprop,
-with multiple appearances (e.g.
-.BR COMMAND )
-are expressed as a sequence of
-values separated by newlines.
-.PP
-The header file defines macros to extract commonly-used
-attributes:
-.IP
-.EX
-PIC_NCHAN(pf), PIC_WIDTH(pf), PIC_HEIGHT(pf),
-PIC_SAMEARGS(pf) \fR(see \fP\&picopen_w\fR)\fP
-.EE
-.PP
-.I Picunpack
-extracts the channels of pixel array
-.I pix
-into separate array
-.I args
-of types described by the
-.I fmt
-character string.
-Format characters are
-.BR c ,
-.BR s ,
-.BR l ,
-.BR f ,
-.BR d ,
-for arrays of types unsigned char, short, long,
-float, and double.
-Format character
-.B _
-designates a picfile channel to be skipped.
-.I Picpack
-reverses the process.
-These routines effect a standard machine-independent byte
-ordering.
-.PP
-.IR Picerror
-prints messages for errors resulting from calls to
-.I picfile
-routines.
-.RI ( Perror (3)
-cannot describe some error conditions,
-like malformed header lines.)
-.SH EXAMPLES
-Unpack the green and z channels from a file with channels
-.B rgbz...
-.br
-.ns
-.IP
-.EX
-PICFILE *pf = picopen_r("file");
-extern char pixels[], green[][1000];
-extern float zdepth[][1000];
-for(i=0; picread(pf, pixels); i)
-	picunpack(pf, pixels, "_c_f", green[i], zdepth[i]);
-.EE
-.PP
-Reflect a picture about its vertical midline.
-.br
-.ns
-.IP
-.EX
-PICFILE *in = picopen_r("picture");
-PICFILE *out = picopen_w("OUT", PIC_SAMEARGS(in));
-int w = PIC_WIDTH(in);
-int n = PIC_NCHAN(in);
-char *buffer = malloc(w*n), *temp = malloc(n);
-while (picread(in, buffer)) {
-	char *left = buffer;
-	char *right = buffer + n*(w - 1);
-	for( ; left<right; left+=n, right-=n) {
-		strncpy(temp, left, n);
-		strncpy(left, right, n);
-		strncpy(right, temp, n);
-	}
-	picwrite(out, buffer);
-}
-.EE
-.SH SEE ALSO
-.IR picfile (5),
-.IR pico (1),
-.IR bcp (1)
-.SH DIAGNOSTICS
-.I Picread
-returns 1 on success, 0 on end of file or error.
-.br
-.I Picopen_r
-and
-.I picopen_w
-return 0 for unopenable files.
-.SH BUGS
-.I Picpack
-and
-.I picunpack
-store and retrieve floating point channels (types
-.B f
-and
-.BR d )
-using native floating-point, rather than something
-machine independent like IEEE format.