diff --git a/FASTIMAGE_BROKEN_IMAGES_FIX.md b/FASTIMAGE_BROKEN_IMAGES_FIX.md deleted file mode 100644 index 6b57bb9..0000000 --- a/FASTIMAGE_BROKEN_IMAGES_FIX.md +++ /dev/null @@ -1,237 +0,0 @@ -# FastImage Broken Images Fix - -## Issue Description -After migrating to FastImage, posters were showing broken image icons when: -1. Navigating away from HomeScreen and returning -2. Going to the player and coming back -3. Any unmount/remount cycle of the HomeScreen - -## Root Cause -The HomeScreen was aggressively clearing FastImage's memory cache in two places: -1. **On component unmount** - Clearing cache when leaving HomeScreen -2. **Before player navigation** - Clearing cache before opening the video player - -This defeated the purpose of having a cache and caused broken images because: -- FastImage's disk cache requires the memory cache to load images efficiently -- Clearing memory cache on every navigation forces re-download from network -- The images weren't broken, just not yet reloaded from disk/network - -## Solution Applied - -### ✅ 1. Removed Aggressive Cache Clearing -**Location**: `HomeScreen.tsx` unmount cleanup - -**Before**: -```typescript -useEffect(() => { - return () => { - // Clear image cache when component unmounts to free memory - try { - FastImage.clearMemoryCache(); - } catch (error) { - console.warn('Failed to clear image cache:', error); - } - }; -}, []); -``` - -**After**: -```typescript -useEffect(() => { - return () => { - // Don't clear FastImage cache on unmount - it causes broken images on remount - // FastImage's native libraries (SDWebImage/Glide) handle memory automatically - // Cache clearing only happens on app background (see AppState handler above) - }; -}, []); -``` - -### ✅ 2. Removed Player Navigation Cache Clearing -**Location**: `HomeScreen.tsx` handlePlayStream - -**Before**: -```typescript -const handlePlayStream = async (stream: Stream) => { - try { - // Clear image cache to reduce memory pressure before orientation change - await FastImage.clearMemoryCache(); - // ... navigation code - } -}; -``` - -**After**: -```typescript -const handlePlayStream = async (stream: Stream) => { - try { - // Don't clear cache before player - causes broken images on return - // FastImage's native libraries handle memory efficiently - // ... navigation code - } -}; -``` - -### ✅ 3. Added Smart Background Cache Management -**Location**: `HomeScreen.tsx` new AppState handler - -**Added**: -```typescript -useEffect(() => { - const subscription = AppState.addEventListener('change', nextAppState => { - if (nextAppState === 'background') { - // Only clear memory cache when app goes to background - // This frees memory while keeping disk cache intact for fast restoration - try { - FastImage.clearMemoryCache(); - if (__DEV__) console.log('[HomeScreen] Cleared memory cache on background'); - } catch (error) { - if (__DEV__) console.warn('[HomeScreen] Failed to clear memory cache:', error); - } - } - }); - - return () => { - subscription?.remove(); - }; -}, []); -``` - -## How FastImage Caching Works - -### Three-Tier Cache System -1. **Memory Cache** (fastest) - - In-RAM decoded images ready for immediate display - - Automatically managed by SDWebImage (iOS) / Glide (Android) - - Cleared only when system requests or app backgrounds - -2. **Disk Cache** (fast) - - Downloaded images stored on device - - Persists across app launches - - Used to restore memory cache quickly - -3. **Network** (slowest) - - Only used if image not in memory or disk cache - - Requires network connection - -### Why Not Clear Cache on Navigation? -- **Memory cache is fast to rebuild** from disk cache (~10-50ms) -- **Disk cache persists** - no re-download needed -- **Native libraries are smart** - they handle memory pressure automatically -- **User experience** - instant image display when returning to screen - -## Best Practices for Cache Management - -### ✅ DO: -- Let FastImage's native libraries handle memory automatically -- Clear memory cache only when app goes to **background** -- Trust SDWebImage (iOS) and Glide (Android) - they're battle-tested -- Use `cache: FastImage.cacheControl.immutable` for all images - -### ❌ DON'T: -- Clear cache on component unmount -- Clear cache before navigation -- Clear cache on every screen change -- Manually manage memory that native libraries handle better - -### Optional Manual Cache Clearing -If you need to clear cache (e.g., in Settings): - -```typescript -// Clear memory cache only (fast, recoverable from disk) -await FastImage.clearMemoryCache(); - -// Clear disk cache (removes downloaded images, forces re-download) -await FastImage.clearDiskCache(); -``` - -## Testing the Fix - -### Before Fix: -1. ✅ Open HomeScreen - images load -2. ❌ Navigate to Metadata screen -3. ❌ Return to HomeScreen - broken image icons -4. ⏳ Wait 1-2 seconds - images reload - -### After Fix: -1. ✅ Open HomeScreen - images load -2. ✅ Navigate to Metadata screen -3. ✅ Return to HomeScreen - images display instantly -4. ✅ No broken icons, no waiting - -### After App Backgrounding: -1. ✅ Put app in background -2. ✅ Memory cache cleared (frees RAM) -3. ✅ Return to app -4. ✅ Images restore quickly from disk cache (~50ms) - -## Memory Management - -FastImage's native libraries handle memory efficiently: - -### iOS (SDWebImage) -- Automatic memory warnings handling -- LRU (Least Recently Used) eviction -- Configurable cache size limits -- Image decompression on background threads - -### Android (Glide) -- Automatic low memory detection -- Smart cache trimming based on device state -- Bitmap pooling for memory efficiency -- Activity lifecycle awareness - -## Performance Impact - -### Before Fix: -- 🐌 Image load on return: 500-2000ms (network re-download) -- 📉 Poor UX: broken icons visible to user -- 🔄 Unnecessary network traffic -- 🔋 Battery drain from re-downloads - -### After Fix: -- ⚡ Image load on return: 10-50ms (disk cache restore) -- 😊 Great UX: instant image display -- 📈 Reduced network traffic -- 🔋 Better battery life - -## Additional Notes - -### When Images Might Still Break -Images will only show broken icons if: -1. **Network failure** during initial load -2. **Invalid image URL** provided -3. **Server returns 404/403** for the image -4. **Disk space full** preventing cache storage - -These are legitimate failures, not cache clearing issues. - -### How to Debug -If images are still broken after this fix: - -```typescript -// Add to component -useEffect(() => { - const checkImage = async () => { - try { - const response = await fetch(imageUrl, { method: 'HEAD' }); - console.log('Image reachable:', response.ok); - } catch (error) { - console.log('Image network error:', error); - } - }; - checkImage(); -}, [imageUrl]); -``` - -## Conclusion - -The fix ensures: -- ✅ No broken images on navigation -- ✅ Instant image display on screen return -- ✅ Efficient memory management -- ✅ Better user experience -- ✅ Reduced network usage -- ✅ Better battery life - -FastImage's native libraries are designed for this exact use case - trust them to handle memory efficiently rather than manually clearing cache on every navigation. -