Always generate square cursor images in changeCursor (fix portrait mode issue).

This is a workaround for corrupted non-square cursors seen on some
Windows 7 machines with NVIDIA cards. The corruption only happens when
the screen is in portrait mode.

include/display.js

@@ -657,10 +657,17 @@ return constructor();  // Return the public API interface
 
 
 /* Set CSS cursor property using data URI encoded cursor file */
-function changeCursor(target, pixels, mask, hotx, hoty, w, h, cmap) {
+function changeCursor(target, pixels, mask, hotx, hoty, w0, h0, cmap) {
     "use strict";
     var cur = [], rgb, IHDRsz, RGBsz, ANDsz, XORsz, url, idx, alpha, x, y;
-    //Util.Debug(">> changeCursor, x: " + hotx + ", y: " + hoty + ", w: " + w + ", h: " + h);
+    //Util.Debug(">> changeCursor, x: " + hotx + ", y: " + hoty + ", w0: " + w0 + ", h0: " + h0);
+
+    var w = w0;
+    var h = h0;
+    if (h < w)
+        h = w;                 // increase h to make it square
+    else
+        w = h;                 // increace w to make it square
 
     // Push multi-byte little-endian values
     cur.push16le = function (num) {
@@ -715,18 +722,23 @@ function changeCursor(target, pixels, mask, hotx, hoty, w, h, cmap) {
     // 62: color data (RGBQUAD icColors[])
     for (y = h-1; y >= 0; y -= 1) {
         for (x = 0; x < w; x += 1) {
-            idx = y * Math.ceil(w / 8) + Math.floor(x/8);
+            if (x >= w0 || y >= h0) {
+                cur.push(0);          // blue
+                cur.push(0);          // green
+                cur.push(0);          // red
+                cur.push(0);          // alpha
+            } else {
+                idx = y * Math.ceil(w0 / 8) + Math.floor(x/8);
                 alpha = (mask[idx] << (x % 8)) & 0x80 ? 255 : 0;
-
                 if (cmap) {
-                idx = (w * y) + x;
+                    idx = (w0 * y) + x;
                     rgb = cmap[pixels[idx]];
                     cur.push(rgb[2]);          // blue
                     cur.push(rgb[1]);          // green
                     cur.push(rgb[0]);          // red
                     cur.push(alpha);           // alpha
                 } else {
-                idx = ((w * y) + x) * 4;
+                    idx = ((w0 * y) + x) * 4;
                     cur.push(pixels[idx + 2]); // blue
                     cur.push(pixels[idx + 1]); // green
                     cur.push(pixels[idx    ]); // red
@@ -734,6 +746,7 @@ function changeCursor(target, pixels, mask, hotx, hoty, w, h, cmap) {
                 }
             }
         }
+    }
 
     // XOR/bitmask data (BYTE icXOR[])
     // (ignored, just needs to be right size)