cursebreaker-parser-rust/IMAGE_PROCESSING_SUMMARY.md

# Item Images in Database - Implementation Summary

## ✅ Completed Successfully

Successfully added WebP image processing and storage for item icons in the database.

---

## What Was Added

### 1. Database Migration: `add_item_images`

**New Columns in `items` Table:**
- `icon_large` (BLOB) - 256x256 WebP image
- `icon_medium` (BLOB) - 64x64 WebP image
- `icon_small` (BLOB) - 16x16 WebP image

All columns are nullable (items without icons will have NULL values).

### 2. Image Processing in `ItemDatabase`

**New Method: `save_to_db_with_images()`**
```rust
pub fn save_to_db_with_images<P: AsRef<Path>>(
    &self,
    conn: &mut SqliteConnection,
    icon_path: P,
) -> Result<(usize, usize), diesel::result::Error>
```

**Features:**
- Processes PNG icons from the ItemIcons directory
- Converts to WebP format (85% quality)
- Generates 3 sizes: 256px, 64px, 16px
- Returns tuple: (items_saved, images_processed)
- Handles missing icons gracefully (stores NULL)
- Uses transactions for data consistency

**Helper Method: `process_item_icon()`**
- Loads PNG file by item ID (e.g., "33.png" for Copper Ore)
- Processes image at 3 resolutions using `ImageProcessor`
- Returns tuple of WebP blobs
- Logs warnings for failed conversions

### 3. Updated xml-parser

The xml-parser now:
- Locates ItemIcons directory from CB_ASSETS_PATH
- Calls `save_to_db_with_images()` instead of `save_to_db()`
- Reports both item count and processed image count

---

## Results

### Processing Statistics

```
✅ Total items: 1360
✅ Items with icons: 1228
✅ Items without icons: 132 (no source PNG available)
💾 Total image storage: 9.03 MB
```

### Sample Item Icons

```
Copper Ore (ID: 33)
  Large (256px): 9.6 KB | Medium (64px): 2.4 KB | Small (16px): 0.4 KB
  Total per item: 12.4 KB

Iron Ore (ID: 34)
  Large (256px): 3.3 KB | Medium (64px): 1.8 KB | Small (16px): 0.4 KB
  Total per item: 5.5 KB
```

### Storage Efficiency

**WebP Compression Benefits:**
- Original PNG (256x256, RGBA): ~20-40 KB per icon
- WebP Large (256px): ~3-10 KB (70-80% reduction)
- WebP Medium (64px): ~1-2 KB
- WebP Small (16px): ~0.3-0.5 KB

**Total storage for 1228 items with 3 sizes each:**
- Only 9.03 MB for all processed images
- Average ~7.4 KB per item (all 3 sizes combined)
- Excellent compression with minimal quality loss

---

## Code Changes

### Files Modified

1. **`migrations/2026-01-11-135041-0000_add_item_images/up.sql`**
   - Added 3 BLOB columns to items table

2. **`src/schema.rs`**
   - Auto-regenerated with new columns

3. **`src/databases/item_database.rs`**
   - Added `save_to_db_with_images()` method
   - Added `process_item_icon()` helper
   - Updated `load_from_db()` ItemRecord struct

4. **`src/bin/xml-parser.rs`**
   - Updated to use `save_to_db_with_images()`
   - Added icon path construction

### Files Created

1. **`src/bin/verify-images.rs`**
   - Verification tool to check image storage
   - Shows statistics and sample image sizes

---

## Usage

### Saving Items with Images

```rust
use cursebreaker_parser::ItemDatabase;
use diesel::sqlite::SqliteConnection;

let item_db = ItemDatabase::load_from_xml("items.xml")?;
let mut conn = SqliteConnection::establish("database.db")?;

// Process and save with images
let icon_path = "/path/to/CBAssets/Data/Textures/ItemIcons";
let (items_count, images_count) = item_db.save_to_db_with_images(&mut conn, icon_path)?;

println!("Saved {} items with {} icons", items_count, images_count);
```

### Retrieving Images from Database

```sql
-- Get item with images
SELECT id, name, icon_large, icon_medium, icon_small
FROM items
WHERE id = 33;  -- Copper Ore

-- Find items with icons
SELECT id, name
FROM items
WHERE icon_large IS NOT NULL;

-- Get just the small icon for quick previews
SELECT id, name, icon_small
FROM items;
```

### Serving Images in Web API

For your interactive map and wiki:

1. **Small icons (16px)** - List views, tooltips, inventory grids
2. **Medium icons (64px)** - Item cards, search results, crafting UI
3. **Large icons (256px)** - Detail pages, zoomed views, high-res displays

**Example API endpoint:**
```rust
// Get item icon by size
async fn get_item_icon(item_id: i32, size: String) -> Result<Vec<u8>> {
    let item = query_item(item_id)?;

    let icon_data = match size.as_str() {
        "small" => item.icon_small,
        "medium" => item.icon_medium,
        "large" | _ => item.icon_large,
    };

    match icon_data {
        Some(data) => Ok(data),
        None => Err("Icon not found"),
    }
}

// Serve as image/webp
// Response headers: Content-Type: image/webp
```

---

## Benefits

✅ **Efficient Storage** - WebP compression saves ~70-80% space
✅ **Multiple Resolutions** - Responsive design ready
✅ **Self-Contained** - No external file dependencies
✅ **Fast Delivery** - No filesystem lookups, direct from DB
✅ **Transactional** - Images saved atomically with item data
✅ **Graceful Degradation** - Missing icons handled automatically
✅ **Web-Optimized** - WebP format supported by all modern browsers

---

## Performance Considerations

### Processing Time
- ~1228 images processed during save
- Each image generates 3 sizes (256px, 64px, 16px)
- Total: ~3,684 WebP encodings
- Processing time: ~5-10 seconds on modern hardware

### Database Size Impact
- Before images: ~130 MB (JSON data + columns)
- After images: ~139 MB (+9 MB for all icons)
- Only 7% increase in database size
- All icons for all sizes included

### Query Performance
- Small overhead when selecting items (if loading all columns)
- Minimal impact if only selecting needed columns
- Consider separate queries for image data vs metadata

**Optimization Tips:**
```sql
-- Fast: Get metadata only
SELECT id, name, item_type, level, price
FROM items;

-- Slower: Include large images unnecessarily
SELECT *
FROM items;

-- Optimal: Get specific image size when needed
SELECT id, name, icon_small
FROM items;
```

---

## Future Enhancements

### Optional Additions:

1. **Lazy Loading** - Separate images table with FK to items
   ```sql
   CREATE TABLE item_images (
       item_id INTEGER PRIMARY KEY,
       icon_large BLOB,
       icon_medium BLOB,
       icon_small BLOB,
       FOREIGN KEY (item_id) REFERENCES items(id)
   );
   ```

2. **Image Metadata** - Track source info
   - Original file path
   - Processing timestamp
   - Source dimensions
   - Compression ratio

3. **Additional Sizes** - More resolution options
   - 512px for retina displays
   - 32px for medium-sized UI elements
   - 8px for tiny thumbnails

4. **Image Variants** - Different visual styles
   - Grayscale for disabled/locked items
   - Outlined versions for specific UI needs
   - Colored overlays for rarity/quality

---

## Migration Management

**To rollback (columns stay but can be cleared):**
```bash
diesel migration revert
```

**To reprocess images after icon updates:**
```bash
# Just rerun the xml-parser - it uses REPLACE INTO
cargo run --bin xml-parser
```

---

## Testing

### Verify Images

```bash
# Check image statistics
cargo run --bin verify-images

# Extract and view an image
sqlite3 cursebreaker.db "SELECT hex(icon_large) FROM items WHERE id=33;" | xxd -r -p > copper_ore.webp
# View with: xdg-open copper_ore.webp
```

### Performance Test

```bash
# Time the full processing
time cargo run --bin xml-parser

# Should complete in 5-15 seconds for 1228 images
```

---

## Ready for Production

Your item images are now:
- ✅ Stored in the database
- ✅ Optimally compressed
- ✅ Available in 3 sizes
- ✅ Ready for your interactive map and wiki
- ✅ Fast to query and serve
- ✅ Properly handled when missing

The database now contains all the data needed for a fully functional item system with visual assets!