a

libmemlayer/load.c

@@ -0,0 +1,55 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <memdraw.h>
+#include <memlayer.h>
+
+int
+memload(Memimage *dst, Rectangle r, uchar *data, int n, int iscompressed)
+{
+	int (*loadfn)(Memimage*, Rectangle, uchar*, int);
+	Memimage *tmp;
+	Memlayer *dl;
+	Rectangle lr;
+	int dx;
+
+	loadfn = loadmemimage;
+	if(iscompressed)
+		loadfn = cloadmemimage;
+
+    Top:
+	dl = dst->layer;
+	if(dl == nil)
+		return loadfn(dst, r, data, n);
+
+	/*
+ 	 * Convert to screen coordinates.
+	 */
+	lr = r;
+	r.min.x += dl->delta.x;
+	r.min.y += dl->delta.y;
+	r.max.x += dl->delta.x;
+	r.max.y += dl->delta.y;
+	dx = dl->delta.x&(7/dst->depth);
+	if(dl->clear && dx==0){
+		dst = dl->screen->image;
+		goto Top;
+	}
+
+	/*
+	 * dst is an obscured layer or data is unaligned
+	 */
+	if(dl->save && dx==0){
+		n = loadfn(dl->save, lr, data, n);
+		if(n > 0)
+			memlexpose(dst, r);
+		return n;
+	}
+	tmp = allocmemimage(lr, dst->chan);
+	if(tmp == nil)
+		return -1;
+	n = loadfn(tmp, lr, data, n);
+	memdraw(dst, lr, tmp, lr.min, nil, lr.min, S);
+	freememimage(tmp);
+	return n;
+}