1 files changed, 86 insertions, 0 deletions
diff --git a/utils/cvbit/cvbit.c b/utils/cvbit/cvbit.c
new file mode 100644
index 00000000..dcd140f0
--- /dev/null
+++ b/utils/cvbit/cvbit.c
@@ -0,0 +1,86 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <memdraw.h>
+#include <pool.h>
+
+static int invert = 0;
+
+void
+main(int argc, char **argv)
+{
+	Memimage *im, *om;
+	char *s;
+	ulong ofmt;
+
+	ofmt = 0;
+	ARGBEGIN{
+	case 'i':
+		invert = 1;
+		break;
+	case 'c':
+		s = ARGF();
+		if(s==nil)
+			break;
+		ofmt = strtochan(s);
+		if(ofmt == 0){
+			fprint(2, "cvbit: bad chan: %s\n", s);
+			exits("chan");
+		}
+		break;
+	}ARGEND
+
+	memimageinit();
+	im = readmemimage(0);
+	if(im == nil){
+		fprint(2, "cvbit: can't read image: %r\n");
+		exits("read");
+	}
+	if(ofmt){
+		om = allocmemimage(im->r, ofmt);
+		if(om == nil){
+			fprint(2, "cvbit: can't allocate new image: %r\n");
+			exits("alloc");
+		}
+		memimagedraw(om, om->r, im, im->r.min, nil, ZP, S);
+	}else
+		om = im;
+	if(invert){
+		uchar *buf;
+		int bpl, y, x;
+
+		bpl = bytesperline(om->r, om->depth);
+		buf = malloc(bpl);
+		for(y=om->r.min.y; y<om->r.max.y; y++){
+			if(unloadmemimage(om, Rpt(Pt(om->r.min.x,y), Pt(om->r.max.x,y+1)), buf, bpl) != bpl){
+				fprint(2, "cvbit: can't unload image line\n");
+				exits("unload");
+			}
+			for(x=0; x<bpl; x++)
+				buf[x] ^= 0xFF;
+			if(loadmemimage(om, Rpt(Pt(om->r.min.x,y), Pt(om->r.max.x,y+1)), buf, bpl) != bpl){
+				fprint(2, "cvbit: can't load image line\n");
+				exits("load");
+			}
+		}
+	}
+	if(writememimage(1, om) < 0){
+		fprint(2, "cvbit: can't write image: %r\n");
+		exits("write");
+	}
+	exits(nil);
+}
+
+char*
+poolname(Pool *p)
+{
+	USED(p);
+	return "none";
+}
+
+void
+poolsetcompact(Pool *p, void (*f)(void*, void*))
+{
+	USED(p);
+	USED(f);
+}