The -keep rule for no.naiv.tiltshift.effect.** was based on the
incorrect assumption that GLSL shaders use Java reflection. Shader
source is loaded from raw resources — all effect classes are reached
through normal Kotlin code and R8 can trace them. Removing the rule
lets R8 properly optimize the effect package.
Also extract SaveResult sealed class from PhotoSaver.kt into its own
file to match the documented architecture.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Concurrency & bitmap lifecycle:
- Defer bitmap recycling by one cycle so Compose finishes drawing before
native memory is freed (preview bitmaps, thumbnails)
- Make galleryPreviewSource @Volatile for cross-thread visibility
- Join preview job before recycling source bitmap in cancelGalleryPreview()
to prevent use-after-free during CPU blur loop
- Add @Volatile to TiltShiftRenderer.currentTexCoords (UI/GL thread race)
- Fix error dismiss race with cancellable Job tracking
Lifecycle & resource management:
- Release GL resources via glSurfaceView.queueEvent (must run on GL thread)
- Pause GLSurfaceView when entering gallery preview mode
- Shut down captureExecutor in CameraManager.release() (thread leak)
- Use WeakReference for lifecycleOwnerRef to avoid Activity GC delay
- Fix thumbnail bitmap leak on coroutine cancellation (add to finally)
- Guarantee imageProxy.close() in finally block
Performance:
- Compute gradient mask at 1/4 resolution with bilinear upscale (~93%
less per-pixel trig work, ~75% less mask memory)
- Precompute cos/sin on CPU, pass as uCosAngle/uSinAngle uniforms
(eliminates per-fragment transcendental calls in GLSL)
- Unroll 9-tap Gaussian blur kernel (avoids integer-branched weight
lookup that de-optimizes on mobile GPUs)
- Add 80ms debounce to preview recomputation during slider drags
Silent failure fixes:
- Check bitmap.compress() return value; report error on failure
- Log all loadBitmapFromUri null paths (stream, dimensions, decode)
- Surface preview computation errors and ActivityNotFoundException to user
- Return boolean from writeExifToUri, log at ERROR level
- Wrap gallery preview downscale in try-catch (OOM protection)
Config:
- Add ACCESS_MEDIA_LOCATION permission (GPS EXIF on Android 10+)
- Accept coarse-only location grant for geotags
- Remove dead adjustResize (no effect with edge-to-edge)
- Set windowBackground to black (eliminates white flash on cold start)
- Add values-night theme for dark mode
- Remove overly broad ProGuard keeps (CameraX/GMS ship consumer rules)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
A dedicated camera app for tilt-shift photography with:
- Real-time OpenGL ES 2.0 shader-based blur preview
- Touch gesture controls (drag, rotate, pinch) for adjusting effect
- CameraX integration for camera preview and high-res capture
- EXIF metadata with GPS location support
- MediaStore integration for saving to gallery
- Jetpack Compose UI with haptic feedback
Tech stack: Kotlin, CameraX, OpenGL ES 2.0, Jetpack Compose
Min SDK: 26 (Android 8.0), Target SDK: 35 (Android 15)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
