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>
Add uIsFrontCamera uniform to shader and adjust coordinate
transformations for front camera's mirrored texture coordinates:
- Position transform: (1-posY, 1-posX) instead of (posY, 1-posX)
- Angle transform: -angle - 90° instead of +angle + 90°
Applied to linearFocusDistance, radialFocusDistance, and blur
direction calculations in sampleBlurred.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Add separate texture coordinates for front and back cameras
- Front camera uses mirrored coordinates for natural selfie view
- Add setFrontCamera() method to renderer for dynamic switching
- Update texture coord buffer on GL thread when camera changes
- CameraScreen observes isFrontCamera state to trigger updates
Co-Authored-By: Claude Opus 4.5 <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>
