Scrawl-canvas v8 - Filters test 016

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

Annotated code