Canvas PNG transparency lost

[tomasdev]

The method .draw is not working as drawImage native method does.

If, for example, I wrote
bmd = new BitmapData(100, 100, true); bmd.draw(img); ctx.putImageData(bmd.data, 0, 0);
instead of
ctx.drawImage(img);

I will get, in the first case, the PNG loaded with black background. By the way, in the second case, I get the PNG with alpha loaded.

I realize nobody will use 3 lines when they can use just 1. But I needed this library to apply ColorMatrixFilters... I would love to help in any sense you think I could.

[Mark-Rodriguez]

Way down at the bottom of the BitmapData.js file you will find these lines

if(fillColor) this.fillRect(this.rect, fillColor);
else this.fillRect(this.rect, 0);
return this;

wrap the

if(fillColor) this.fillRect(this.rect, fillColor);
else this.fillRect(this.rect, 0);

with a statement that says

if (!transparent)
{

}

so the final result will be

if (!transparent)
{
    if(fillColor) this.fillRect(this.rect, fillColor);
    else this.fillRect(this.rect, 0);
}
return this;

that should give you a transparent BG.