1 files changed, 24 insertions, 0 deletions
diff --git a/libmemdraw/unload.c b/libmemdraw/unload.c
new file mode 100644
index 00000000..bea3c31b
--- /dev/null
+++ b/libmemdraw/unload.c
@@ -0,0 +1,24 @@
+#include "lib9.h"
+#include "draw.h"
+#include "memdraw.h"
+
+int
+unloadmemimage(Memimage *i, Rectangle r, uchar *data, int ndata)
+{
+	int y, l;
+	uchar *q;
+
+	if(!rectinrect(r, i->r))
+		return -1;
+	l = bytesperline(r, i->depth);
+	if(ndata < l*Dy(r))
+		return -1;
+	ndata = l*Dy(r);
+	q = byteaddr(i, r.min);
+	for(y=r.min.y; y<r.max.y; y++){
+		memmove(data, q, l);
+		q += i->width*sizeof(ulong);
+		data += l;
+	}
+	return ndata;
+}