A way to work with alpha video（WPF）

[LazyCuteLion]

1、FlyleafHost line-880,change the border.background to #01000000
2、Renderer.PixelShader line-560 cancel this line,does not use BlendState（if you did not do it,then you will got repetitive frame of the video）
3、Renderer.Present line-126 and 247 cancel these two line, does not use ClearRenderTargetView,beacuse of it will ignore the A of the second parameters(even it is Color4) and give a solid color.
4、there have a apng to test,you also can converter to a mov

5、this has some flaws,there are burrs on the edges (same video,ffmediaelement rendering good). hope someone can fix it.

[LazyCuteLion]

on the last point, some progress has been made:
ShaderCompiler line-366 add "color.rgb *= color.a;"

[LazyCuteLion]

https://github.com/LazyCuteLion/Flyleaf/tree/alpha_video

[LazyCuteLion]

WinUI3 has some progress: use WinUIEx,set the Window.SystemBackdrop to TransparentTintBackdrop, and change the line-157 of Renderer.SwapChain.cs(set alpha to true of GetSwapChainDesc).Then,it renderering as same of WPF,but,it can't be mouse through.
I think,the FlyleafHost(WinUI3) should be change as same of WPF,use a Window host the SwapChainPanel.
Do you have any time to try it? @SuRGeoNix

[SuRGeoNix]

Not really, maybe in 1-2 weeks... I'm trying to release v3.8 with updated vortice/custom generator-ffmpeg libraries and some other libs that will be the entry level for v4.

[LazyCuteLion]

Ok.But I really want it can support alpha.
Look forward to your new version.