To change image, drag-and-drop an image file over the canvas
Line IN
Line MIX
Blend operation
Opacity
Offset - X
Offset - Y
Test purpose
Create two Cells which we can use to generate images for the filter
Load an additional image from the DOM
For each of our assets, create an image filter to load the assets into the filter pipeline
Create a blend filter
Create a Block entity, using a gradient for its fill, and apply the blend filter to it
Update the filter's lineIn and lineMix attributes and note the effect
Update the blend operation, check that the choice changes the display appropriately
In particular make sure the lineMix asset moves when the filter offset values are updated
Note that filter memoization would provide no benefit in this demo because of the way we include the (rotating) cell-based wheel image filter in the display block filters array, even though that filter will only be displayed (as part of the compositing filter) if selected. Moral: only load process-image filters into a filter array if you intend to use them!
