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Properly block source layer until copy to destination is complete.

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This commit is contained in:
Michael Jumper
2012-01-26 11:48:19 -08:00
parent 8cc8ad9e5e
commit 684dcdd33f
1 changed files with 15 additions and 9 deletions
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24
guacamole-common-js/src/main/resources/layer.js
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@@ -410,6 +410,7 @@ Guacamole.Layer = function(width, height) {
*/
this.copyRect = function(srcLayer, srcx, srcy, srcw, srch, x, y) {
var drawComplete = false;
var srcLock = null;
function doCopyRect() {
@@ -419,9 +420,12 @@ Guacamole.Layer = function(width, height) {
if (srcCanvas.width != 0 && srcCanvas.height != 0)
displayContext.drawImage(srcCanvas, srcx, srcy, srcw, srch, x, y, srcw, srch);
// Unblock the copy complete task, if it exists
// Unblock the source layer now that draw is complete
if (srcLock != null)
srcLock.unblock();
// Flag operation as done
drawComplete = true;
}
// If we ARE the source layer, no need to sync.
@@ -432,17 +436,19 @@ Guacamole.Layer = function(width, height) {
// Otherwise synchronize copy operation with source layer
else {
// Task which will be unblocked only when the source layer is ready
// This task will perform the copy
// Currently blocked draw task
var task = scheduleTask(doCopyRect, true);
// Task which will unblock the drawing task.
var srcReady = srcLayer.sync(task.unblock);
// Unblock draw task once source layer is ready
srcLayer.sync(task.unblock);
// Task which will be unblocked only after the copy has
// occurred (this will only be created if the draw task
// was postponed)
if (srcReady != null) srcLock = srcLayer.sync(null, true);
// Block source layer until draw completes
// Note that the draw MAY have already been performed at this point,
// in which case creating a lock on the source layer will lead to
// deadlock (the draw task has already run and will thus never
// clear the lock)
if (!drawComplete)
srcLock = srcLayer.sync(null, true);
}