Freeing ImageData when deleting a Canvas
- by user578770
I'm writing a XUL application using HTML Canvas to display Bitmap images.
I'm generating ImageDatas and imporingt them in a canvas using the putImageData function :
for(var pageIndex=0;pageIndex<100;pageIndex++){
this.img = imageDatas[pageIndex];
/* Create the Canvas element */
var imgCanvasTmp = document.createElementNS("http://www.w3.org/1999/xhtml",'html:canvas');
imgCanvasTmp.setAttribute('width', this.img.width);
imgCanvasTmp.setAttribute('height', this.img.height);
/* Import the image into the Canvas */
imgCanvasTmp.getContext('2d').putImageData(this.img, 0, 0);
/* Use the Canvas into another part of the program (Commented out for testing) */
// this.displayCanvas(imgCanvasTmp,pageIndex);
}
The images are well imported but there seems to be a memory leak due to the putImageData function.
When exiting the "for" loop, I would expect the memory allocated for the Canvas to be freed but, by executing the code without executing putImageData, I noticed that my program at the end use 100Mb less (my images are quite big).
I came to the conclusion that the putImageData function prevent the garbage collector to free the allocated memory.
Do you have any idea how I could force the garbage collector to free the memory? Is there any way to empty the Canvas?
I already tried to delete the canvas using the delete operator or to use the clearRect function but it did nothing.
I also tried to reuse the same canvas to display the image at each iteration but the amount of memory used did not changed, as if the image where imported without deleting the existing ones...
