Merge pull request #58 from santigimeno/xfixes_requests

Add some REGION-related XFIXES requests

lib/ext/fixes.js

@@ -3,6 +3,19 @@
 var x11 = require('..');
 // TODO: move to templates
 
+function parse_rectangle(buf, pos) {
+    if (!pos) {
+        pos = 0;
+    }
+    
+    return {
+        x : buf[pos],
+        y : buf[pos + 1],
+        width : buf[pos + 2],
+        height : buf[pos + 3]
+    }
+}
+
 exports.requireExt = function(display, callback) 
 {
     var X = display.client;
@@ -35,6 +48,66 @@ exports.requireExt = function(display, callback)
             X.pack_stream.flush();
         };
 
+        ext.CreateRegion = function(region, rects) {
+            X.seq_num ++;
+            var format = 'CCSL';
+            format += Array(rects.length + 1).join('ssSS');
+            var args = [ ext.majorOpcode, 5, 2 + (rects.length << 1), region ];
+            rects.forEach(function(rect) {
+                args.push(rect.x);
+                args.push(rect.y);
+                args.push(rect.width);
+                args.push(rect.height);
+            });
+
+            X.pack_stream.pack(format, args);
+            X.pack_stream.flush();
+        }
+
+        ext.DestroyRegion = function(region) {
+            X.seq_num ++;
+            X.pack_stream.pack('CCSL', [ ext.majorOpcode, 10, 2, region ]);
+            X.pack_stream.flush();
+        }
+
+        ext.UnionRegion = function(src1, src2, dst) {
+            X.seq_num ++;
+            X.pack_stream.pack('CCSLLL', [ ext.majorOpcode, 13, 4, src1, src2, dst ]);
+            X.pack_stream.flush();
+        }
+
+        ext.TranslateRegion = function(region, dx, dy) {
+            X.seq_num ++;
+            X.pack_stream.pack('CCSLss', [ ext.majorOpcode, 17, 3, region, dx, dy ]);
+            X.pack_stream.flush();
+        }
+        
+        ext.FetchRegion = function(region, cb) {
+            X.seq_num ++;
+            X.pack_stream.pack('CCSL', [ ext.majorOpcode, 19, 2, region ]);
+            X.replies[X.seq_num] = [
+                function(buf, opt) {
+                    var n_rectangles = (buf.length - 24) >> 3;
+                    var format = 'ssSSxxxxxxxxxxxxxxxx';
+                    format += Array(n_rectangles + 1).join('ssSS');
+                    var res = buf.unpack(format);
+                    var reg = {
+                        extents : parse_rectangle(res),
+                        rectangles : []
+                    };
+
+                    for (var i = 0; i < n_rectangles; ++ i) {
+                        reg.rectangles.push(parse_rectangle(res, 4 + (i << 2)));
+                    }
+                    
+                    return reg;
+                },
+                cb
+            ];
+
+            X.pack_stream.flush();
+        }
+
         ext.QueryVersion(5, 0, function(err, vers) {
             ext.major = vers[0];
             ext.minor = vers[1];