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Fix race condition where the source of a copy operation may be altered before the destination is drawn to (thus the copy may not always copy what we THINK it should be copying, especially if many buffers are repeatedly used and quickly discarded).

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This commit is contained in:
Michael Jumper
2012-01-10 23:06:28 -08:00
parent 0a4931cb41
commit e776fbfcec
1 changed files with 20 additions and 2 deletions
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22
guacamole-common-js/src/main/resources/layer.js
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@@ -372,7 +372,7 @@ Guacamole.Layer = function(width, height) {
* pending operations are complete.
*/
this.sync = function(handler) {
scheduleTask(handler);
return scheduleTask(handler);
};
/**
@@ -398,12 +398,18 @@ Guacamole.Layer = function(width, height) {
*/
this.copyRect = function(srcLayer, srcx, srcy, srcw, srch, x, y) {
var srcCopied = null;
function doCopyRect() {
if (layer.autosize != 0) fitRect(x, y, srcw, srch);
var srcCanvas = srcLayer.getCanvas();
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
if (srcCopied != null)
srcCopied.handler = function() {};
}
// If we ARE the source layer, no need to sync.
@@ -413,8 +419,13 @@ 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
var task = scheduleTask(null);
srcLayer.sync(function() {
// Task which will unblock the drawing task.
var srcReady = srcLayer.sync(function() {
task.handler = doCopyRect;
@@ -423,6 +434,13 @@ Guacamole.Layer = function(width, height) {
handlePendingTasks();
});
// 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)
srcCopied = srcLayer.sync(null);
}
};