Compose Multiplatform support

[saket]

Migrating Modifier.zoomable() to multiplatform should be easy is done, but SubSamplingImage() will need to be decoupled from Android's BitmapRegionDecoder for lazy loading of bitmap tiles.

Target platforms

JVM

• javax.imageio.ImageIO + ImageReadParam#setSourceRegion can be used. Example usage.
• Pointer events from trackpads aren't supported yet.

Apple

• Someone please correct me if this is wrong, but my limited research points me to CGImageCreateWithImageInRect + kCGImageSourceSubsampleFactor.

For loading of images, @colinrtwhite plans to migrate Coil to multiplatform in v3.

[saket]

Thanks to @DSteve595, Modifier.zoomable() will be available as a multiplatform library in the next release 🎉

[Phaestion]

Hi @saket! From what I can gather multiplatform in this context means Android and Desktop right? I can only see the Android and Desktop versions of the zoomable library published.
I do see you have a reference to Apple in the original description of the issue, is this part still outstanding?

[saket]

I do see you have a reference to Apple in the original description of the issue, is this part still outstanding?

Yep! Wanna help out by sending a PR? 😊

[saket]

For folks following this issue, Coil has started publishing experimental builds with multiplatform support. I'm going to wait a bit for its APIs and maven coordinates to settle before integrating it with telephoto.

[LOOHP]

Hi, does it mean telephoto will support wasm target soon as well?

[saket]

@LOOHP I don't have any plans for the web yet. Are you actually displaying large images on the web that require subsampling?

[LOOHP]

I'm working on displaying a large railway system map with each station being clickable to perform some action. So it needs to stay HD when it is zoomed in.
If telephoto supports wasm as well, it would be fantastic as I will be able to use it for Android, IOS, JVM & Web all in the same Compose Multiplatform code.

[Vichy97]

If the zoomable modifier already is KMP compatible, could a KMP compatible release be made for just the modifier? I am unable to use this in a KMP project as-is, but I only need the modifier

[saket]

Modifier.zoomable() is already available for the JVM and Android. What other platforms are you targeting? We can add the rest here, if you want to send a PR:

telephoto/gradle/build-logic/convention/src/main/kotlin/KotlinMultiplatformConventionPlugin.kt

Lines 25 to 27 in 16bc5f9

	jvm("desktop")
	if (pluginManager.hasPlugin("com.android.library")) {
	androidTarget {

[Vichy97]

@saket I am looking to target Android and iOS primarily

[Vichy97]

I've created a PR #102 but I'm not sure if this makes sense. Is there a way to make iOS targets for just the Modifier library?