Initial revision

src/libdraw/x11-get.c

@@ -0,0 +1,110 @@
+#include "x11-inc.h"
+
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <memdraw.h>
+#include "x11-memdraw.h"
+
+static void
+addrect(Rectangle *rp, Rectangle r)
+{
+	if(rp->min.x >= rp->max.x)
+		*rp = r;
+	else
+		combinerect(rp, r);
+}
+
+XImage*
+xgetxdata(Memimage *m, Rectangle r)
+{
+	int x, y;
+	uchar *p;
+	Point tp, xdelta, delta;
+	Xmem *xm;
+	
+	xm = m->X;
+	if(xm == nil)
+		return nil;
+
+	if(xm->dirty == 0)
+		return xm->xi;
+
+	r = xm->dirtyr;
+	if(Dx(r)==0 || Dy(r)==0)
+		return xm->xi;
+
+	delta = subpt(r.min, m->r.min);
+
+	tp = xm->r.min;	/* need temp for Digital UNIX */
+	xdelta = subpt(r.min, tp);
+
+	XGetSubImage(_x.display, xm->pixmap, delta.x, delta.y, Dx(r), Dy(r),
+		AllPlanes, ZPixmap, xm->xi, xdelta.x, delta.y);
+
+	if(_x.usetable && m->chan==CMAP8){
+		for(y=r.min.y; y<r.max.y; y++)
+		for(x=r.min.x, p=byteaddr(m, Pt(x,y)); x<r.max.x; x++, p++)
+			*p = _x.toplan9[*p];
+	}
+	xm->dirty = 0;
+	xm->dirtyr = Rect(0,0,0,0);
+	return xm->xi;
+}
+
+void
+xputxdata(Memimage *m, Rectangle r)
+{
+	int offset, x, y;
+	uchar *p;
+	Point tp, xdelta, delta;
+	Xmem *xm;
+	XGC gc;
+	XImage *xi;
+
+	xm = m->X;
+	if(xm == nil)
+		return;
+
+	xi = xm->xi;
+	gc = m->chan==GREY1 ? _x.gccopy0 : _x.gccopy;
+	if(m->depth == 24)
+		offset = r.min.x & 3;
+	else
+		offset = r.min.x & (31/m->depth);
+
+	delta = subpt(r.min, m->r.min);
+
+	tp = xm->r.min;	/* need temporary on Digital UNIX */
+	xdelta = subpt(r.min, tp);
+
+	if(_x.usetable && m->chan==CMAP8){
+		for(y=r.min.y; y<r.max.y; y++)
+		for(x=r.min.x, p=byteaddr(m, Pt(x,y)); x<r.max.x; x++, p++)
+			*p = _x.tox11[*p];
+	}
+
+	XPutImage(_x.display, xm->pixmap, gc, xi, xdelta.x, xdelta.y, delta.x, delta.y,
+		Dx(r), Dy(r));
+	
+	if(_x.usetable && m->chan==CMAP8){
+		for(y=r.min.y; y<r.max.y; y++)
+		for(x=r.min.x, p=byteaddr(m, Pt(x,y)); x<r.max.x; x++, p++)
+			*p = _x.toplan9[*p];
+	}
+}
+
+void
+xdirtyxdata(Memimage *m, Rectangle r)
+{
+	Xmem *xm;
+
+	xm = m->X;
+	if(xm == nil)
+		return;
+	xm->dirty = 1;
+	addrect(&xm->dirtyr, r);
+}
+
+
+