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image: add unary ops

--- /dev/null

+++ b/image/com.c

@@ -1,0 +1,38 @@

+#include <u.h>

+#include <libc.h>

+#include <draw.h>

+#include <memdraw.h>

+#include "fns.h"

+

+static int

+opcom(uchar b)

+{

+	return ~b;

+}

+

+static void

+usage(void)

+{

+	fprint(2, "usage: %s\n", argv0);

+	exits(nil);

+}

+

+void

+main(int argc, char *argv[])

+{

+	Memimage *img;

+

+	ARGBEGIN{

+	default: usage();

+	}ARGEND;

+	if(argc != 0)

+		usage();

+

+	img = ereadmemimage(0);

+	imgunaop(img, opcom, 0);

+

+	ewritememimage(1, img);

+	freememimage(img);

+

+	exits(nil);

+}

--- a/image/fns.h

+++ b/image/fns.h

@@ -9,3 +9,4 @@

 Memimage *ereadmemimage(int);

 int ewritememimage(int, Memimage*);

 void imgbinop(Memimage*, Memimage*, int(*)(uchar, uchar), int);

+void imgunaop(Memimage*, int(*)(uchar), int);

--- a/image/mkfile

+++ b/image/mkfile

@@ -6,6 +6,7 @@

 	add\

 	sub\

 	sobel\

+	com\

 OFILES=\

 	utils.$O\

--- a/image/utils.c

+++ b/image/utils.c

@@ -98,3 +98,19 @@

 		*p1++ = c;

 	}

 }

+

+void

+imgunaop(Memimage *i1, int(*op)(uchar), int saturate)

+{

+	uchar *p1, *p1e;

+	int c;

+

+	p1 = i1->data->bdata;

+	p1e = p1 + Dx(i1->r)*Dy(i1->r)*i1->nchan;

+	while(p1 < p1e){

+		c = op(*p1);

+		if(saturate)

+			c = clamp(c, 0, 0xFF);

+		*p1++ = c;

+	}

+}

-- 

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