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supports BLITTER_FROMSAVED

--- a/plan9.c

+++ b/plan9.c

@@ -70,6 +70,7 @@

 struct blitter {

 	Image *blimg;

+	Point pos;

 };

 frontend *fe = nil;

@@ -340,6 +341,7 @@

 p9_blitter_save(void *handle, blitter *bl, int x, int y)

 {

 	USED(handle);

+	bl->pos = Pt(x, y);

 	draw(bl->blimg, Rect(x, y, x + bl->blimg->r.max.x, y + bl->blimg->r.max.y), screen, nil, Pt(x, y));

 }

@@ -347,6 +349,10 @@

 p9_blitter_load(void *handle, blitter *bl, int x, int y)

 {

 	USED(handle);

+	if (x == BLITTER_FROMSAVED)

+		x = bl->pos.x;

+	if (y == BLITTER_FROMSAVED)

+		y = bl->pos.y;

 	draw(screen, Rect(x, y, x + bl->blimg->r.max.x, y + bl->blimg->r.max.y), bl->blimg, nil, Pt(x, y));

 }