feat: Add onThumbnailReady callback for photo capture #3646
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Add support for generating thumbnails during photo capture with an asynchronous callback that fires before the full photo is saved. This enables instant preview functionality and better UX in camera applications. **Changes:** - Add `thumbnailSize` and `onThumbnailReady` options to `TakePhotoOptions` - Add `ThumbnailFile` type for thumbnail metadata - iOS: Extract embedded thumbnail from AVCapturePhoto using ImageIO for maximum performance - Android: Implement memory-efficient downsampling with hardware-accelerated decoding - Add event bridge `onThumbnailReady` for both platforms - Update documentation with usage examples and platform implementation details - Add thumbnail display in example app **Platform implementations:** - iOS: Uses embedded thumbnail from camera capture if available - Android: Uses BitmapFactory.Options.inSampleSize for efficient downsampling without loading full image into memory Both implementations are asynchronous and non-blocking. Tested on iPhone 14, iOS 18.6.2 Android implementation compiles successfully (needs device testing)
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What
Add support for generating thumbnails during photo capture with an asynchronous callback that fires before the full photo is saved. This enables fast preview functionality without loading the full image.
Changes
thumbnailSizeandonThumbnailReadyoptions toTakePhotoOptionsThumbnailFiletype for thumbnail metadataonThumbnailReadyfor both platformsPlatform implementations
Both implementations are asynchronous and non-blocking.
Disclaimer: I'm not an iOS or Android developer but have relied on Cursor to implement this.
Tested on
iPhone 14, iOS 18.6.2
Android implementation compiles successfully (needs device testing)