UWP - apply a multiplied alpha blending between Visuals

Asked Oct 04 '19 at 22:56

Active Oct 05 '19 at 00:19

Viewed 67 times

I have a RelativePanel that contains two children:

a FrameworkElement A with a ContainerVisual cvA that acts like a background
a RelativePanel B with another ContainerVisual cvB that displays some rectangles on the foreground.

To understand better, suppose I have an image as CompositionBrush of a SpriteVisual inside cvA, and I have to super-impose the rectangles (that are SpriteVisuals as well) of cvB.

I want to alpha-blend the colors of the image vs. the rectangles using multiplication (rather than addition), so that those rectangles seems to highlight portions of the image.

How can I achieve this goal?

Note: here you can find a project to reproduce the environment: https://github.com/cghersi/UWPExamples/tree/master/MultiplyAlphaBlending

edited Oct 05 '19 at 00:19

asked Oct 04 '19 at 22:56

Cristiano Ghersi

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I have invited other engineers to participate in this case. If there is any update, I will tell you. – Faywang - MSFT Oct 07 '19 at 08:19
Thank you @Faywang-MSFT, I will wait for any feedback! – Cristiano Ghersi Oct 07 '19 at 17:10

UWP - apply a multiplied alpha blending between Visuals

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