Closing the functionality gap with Android T Compose on Andr

Question

Closing the functionality gap with Android T Compose on Android for shader backed render effects that can run on any node in Compose hierarchy has a bit more technical detail Once the PR linked in it is merged and Compose Desktop picks up that version of Skiko it will be made available for all supported desktop platforms is a simpler one applying a static shader render effect is a bit more complex see attached video It shows a dynamic shader that combines two child shaders one that blurs the left part of the button and another that colorizes the right part of the button to be red tinted The slider under the button is wired to change the horizontal boundary between the two child shaders showing how to combine `remember mutableStateOf ` together with the newly added binding to the underlying `SkRuntimeShaderBuilder uniform` When the mouse is moved over the button the amount of blur and red tinting goes down showing how to combine `derivedStateOf` with the same `SkRuntimeShaderBuilder uniform` Apart from the more demo ey nature of this video this should enable not only in Android stretch overscroll content blur fancy ripples but also things like image editing with quick live previews of effects introduction tutorials that blur highlight relevant parts of the UI and many more

mikehearn · Answer

Are shaders in CfD also written in Android Graphics Shading Language AGSL

Kirill Grouchnikov · Answer

These are in SkSL <https skia org docs user sksl |https skia org docs user sksl >

mikehearn · Answer

Skia got a new website

mikehearn · Answer

Looks a lot like how JavaFX does it except exposed as a public API

mikehearn · Answer

I m curious if anyone ever tried to port implement a Java2D graphics context onto Skia Is that a part of CfD already I guess it must be due to the Swing interop but that seems like an independently useful component

Kirill Grouchnikov · Answer

mikehearn · Answer

Neat thanks

Kirill Grouchnikov · Answer

I don t think that it should be a part of Compose Desktop though

Kirill Grouchnikov · Answer

It s also using different Skia bindings see <https github com jfree skijagraphics2d issues 7> for more info

mikehearn · Answer

Is Skiko only usable from Kotlin codebases Normally Java code can call into Kotlin classes You re using coroutines or DSLs or something

Kirill Grouchnikov · Answer

A question for me If so I have linked to the two demos both of which are Compose apps

mikehearn · Answer

Sorry I meant why does using Skiko require converting the library to Kotlin first I haven t looked at the Skiko API Normally Kotlin classes are usable from Java

Kirill Grouchnikov · Answer

That would be up to David JFree developer to decide whether to make the switch and where to draw the line between Java and Kotlin