Basic support for canvas only (patch from trac #3503)

lib/OpenLayers/Renderer/Canvas.js

@@ -527,7 +527,9 @@ OpenLayers.Renderer.Canvas = OpenLayers.Class(OpenLayers.Renderer, {
     drawText: function(location, style) {
         style = OpenLayers.Util.extend({
             fontColor: "#000000",
-            labelAlign: "cm"
+            labelAlign: "cm",
+            labelOutlineColor: "white",
+            labelOutlineWidth: 3
         }, style);
         var pt = this.getLocalXY(location);
 
@@ -560,6 +562,13 @@ OpenLayers.Renderer.Canvas = OpenLayers.Class(OpenLayers.Renderer, {
                 this.canvas.measureText('xx').width;
             pt[1] += lineHeight*vfactor*(numRows-1);
             for (var i = 0; i < numRows; i++) {
+                if (style.labelOutlineWidth) {
+                    this.canvas.save();
+                    this.canvas.strokeStyle = style.labelOutlineColor;
+                    this.canvas.lineWidth = style.labelOutlineWidth;
+                    this.canvas.strokeText(labelRows[i], pt[0], pt[1] + (lineHeight*i));
+                    this.canvas.restore();
+                }
                 this.canvas.fillText(labelRows[i], pt[0], pt[1] + (lineHeight*i));
             }
         } else if (this.canvas.mozDrawText) {