1 files changed, 52 insertions, 0 deletions
diff --git a/os/boot/rpcg/gbitbltclip.c b/os/boot/rpcg/gbitbltclip.c
new file mode 100644
index 00000000..cbf877f5
--- /dev/null
+++ b/os/boot/rpcg/gbitbltclip.c
@@ -0,0 +1,52 @@
+#include <u.h>
+#include <libc.h>
+#include <libg.h>
+#include <gnot.h>
+
+void
+gbitbltclip(void *vp)
+{
+	int dx, dy;
+	int i;
+	struct{
+		GBitmap *dm;
+		Point p;
+		GBitmap *sm;
+		Rectangle r;
+		Fcode f;
+	}*bp;
+
+	bp = vp;
+	dx = Dx(bp->r);
+	dy = Dy(bp->r);
+	if(bp->p.x < bp->dm->clipr.min.x){
+		i = bp->dm->clipr.min.x-bp->p.x;
+		bp->r.min.x += i;
+		bp->p.x += i;
+		dx -= i;
+	}
+	if(bp->p.y < bp->dm->clipr.min.y){
+		i = bp->dm->clipr.min.y-bp->p.y;
+		bp->r.min.y += i;
+		bp->p.y += i;
+		dy -= i;
+	}
+	if(bp->p.x+dx > bp->dm->clipr.max.x)
+		bp->r.max.x -= bp->p.x+dx-bp->dm->clipr.max.x;
+	if(bp->p.y+dy > bp->dm->clipr.max.y)
+		bp->r.max.y -= bp->p.y+dy-bp->dm->clipr.max.y;
+	if(bp->r.min.x < bp->sm->clipr.min.x){
+		i = bp->sm->clipr.min.x-bp->r.min.x;
+		bp->p.x += i;
+		bp->r.min.x += i;
+	}
+	if(bp->r.min.y < bp->sm->clipr.min.y){
+		i = bp->sm->clipr.min.y-bp->r.min.y;
+		bp->p.y += i;
+		bp->r.min.y += i;
+	}
+	if(bp->r.max.x > bp->sm->clipr.max.x)
+		bp->r.max.x = bp->sm->clipr.max.x;
+	if(bp->r.max.y > bp->sm->clipr.max.y)
+		bp->r.max.y = bp->sm->clipr.max.y;
+}