9webdraw: l request: left[1] is signed.
Since JavaScript is a high-level language, I have to implement two's-complement myself!

Also remove logging of implemented draw requests, and implement a couple of trivial ones.

Reference: /n/atom/patch/applied/9wd-lfont-signed
Date: Mon Mar 10 21:25:09 CET 2014
Signed-off-by: root@davidrhoskin.com

--- /usr/web/9wd/9wd.html	Mon Mar 10 21:21:29 2014
+++ /usr/web/9wd/9wd.html	Mon Mar 10 21:21:30 2014
@@ -10,6 +10,7 @@
 		<script type="text/javascript" charset="utf-8" src="js/settings.js"></script>
 		<script type="text/javascript" charset="utf-8" src="js/util/array.js"></script>
 		<script type="text/javascript" charset="utf-8" src="js/util/pad.js"></script>
+		<script type="text/javascript" charset="utf-8" src="js/util/twoscmpl.js"></script>
 		<script type="text/javascript" charset="utf-8" src="js/lib9p/utf8.js"></script>
 		<script type="text/javascript" charset="utf-8" src="js/lib9p/socket.js"></script>
 		<script type="text/javascript" charset="utf-8" src="js/lib9p/lib9p.js"></script>
--- /usr/web/9wd/js/draw/data.js	Mon Mar 10 21:21:31 2014
+++ /usr/web/9wd/js/draw/data.js	Mon Mar 10 21:21:33 2014
@@ -8,7 +8,7 @@
 	var ai = new ArrayIterator(data);
 	while(ai.hasRemainingBytes()){
 		var c = String.fromCharCode(ai.getChar());
-		cons.log("writedrawdata: " + c);
+		//cons.log("writedrawdata: " + c);
 		if(this.drawdatahandlers[c] == undefined){
 			throw("bad draw command");
 		}else{
@@ -98,6 +98,12 @@
 		}catch(e){
 			throw("short draw message");
 		}
+		var dst = conn.imgs[dstid];
+		if(dst == undefined){
+			throw("invalid image id");
+		}
+		dst.repl = repl;
+		dst.clipr = clipr;
 	},
 	"d": function(conn, offset, ai){
 		try{
@@ -134,6 +140,7 @@
 		}
 	},
 	"e": function(conn, offset, ai){
+		cons.log("writedrawdata: 'e' (ellipse outline) unimplemented!");
 		try{
 			var dstid = ai.getLong();
 			var srcid = ai.getLong();
@@ -178,8 +185,18 @@
 		}catch(e){
 			throw("short draw message");
 		}
+		var img = conn.imgs[id];
+		if(img == undefined){
+			throw("invalid image id");
+		}
+		var screen = img.screen;
+		if(screen){
+			delete screen.imgs[id];
+		}
+		delete conn.imgs[id];
 	},
 	"F": function(conn, offset, ai){
+		cons.log("writedrawdata: 'F' (free screen) unimplemented!");
 		try{
 			var id = ai.getLong();
 		}catch(e){
@@ -210,7 +227,7 @@
 			var index = ai.getShort();
 			var r = ai.getRect();
 			var sp = ai.getPoint();
-			var left = ai.getChar();
+			var left = signed8dec(ai.getChar());
 			var width = ai.getChar();
 		}catch(e){
 			throw("short draw message");
@@ -292,6 +309,7 @@
 		conn.imgs[id] = imgnames[name];
 	},
 	"o": function(conn, offset, ai){
+		cons.log("writedrawdata: 'o' (translate window) unimplemented!");
 		try{
 			var id = ai.getLong();
 			var rmin = ai.getPoint();
@@ -370,6 +388,7 @@
 		Memdraw.fillpoly(dst, dp, wind, src, sp, conn.op);
 	},
 	"r": function(conn, offset, ai){
+		cons.log("writedrawdata: 'r' (read back rectangle) unimplemented!");
 		try{
 			var id = ai.getLong();
 			var r = ai.getRect();
@@ -450,6 +469,7 @@
 		Memdraw.string(dst, src, font, dp, clipr, sp, bg, bp, index, conn.op);
 	},
 	"S": function(conn, offset, ai){
+		cons.log("writedrawdata: 'S' (screen attach public) unimplemented!");
 		try{
 			var id = ai.getLong();
 			var chan = ai.getLong();
@@ -458,6 +478,7 @@
 		}
 	},
 	"t": function(conn, offset, ai){
+		cons.log("writedrawdata: 't' (top of window stack) unimplemented!");
 		try{
 			var top = ai.getChar();
 			var n = ai.getShort();
@@ -470,6 +491,7 @@
 		}
 	},
 	"v": function(conn, offset, ai){
+		//cons.log("writedrawdata: 'v' (flush) unimplemented!");
 	},
 	"y": function(conn, offset, ai){
 		try{
--- /usr/web/9wd/js/draw/memdraw.js	Mon Mar 10 21:21:33 2014
+++ /usr/web/9wd/js/draw/memdraw.js	Mon Mar 10 21:21:36 2014
@@ -250,7 +250,7 @@
 		for(var i = 0; i < index.length; ++i){
 			if(index[i] == 0 || index[i] >= font.nchar){
 				throw("font cache index out of bounds");
-			}cons.log("char: " + index[i]);
+			}
 			drawchar(dst, p, src, sp, bg, bp, font, font.fchar[index[i]], op);
 		}
 	},
--- /usr/web/9wd/js/util/twoscmpl.js	Thu Jan  1 00:00:00 1970
+++ /usr/web/9wd/js/util/twoscmpl.js	Mon Mar 10 21:21:38 2014
@@ -0,0 +1,6 @@
+function signed8dec(val){
+	if(val > 0x7F)
+		return -(~(val - 1) & 0xFF);
+	else
+		return val;
+}