feat(compression): add zlib compression for scene files and image optimization

- Add flate2 dependency for zlib compression support in Rust backend
- Implement compressed scene file format with magic number (PURGIFZ1) for format detection
- Add backward compatibility for loading uncompressed legacy scene files
- Convert scene JSON to compact format (no indentation) to reduce file size
- Add image compression utilities with configurable quality and dimensions
- Implement image size detection and compression necessity checking
- Add helper functions for base64 image size calculation and MIME type detection
- Disable global Tauri object in web context for security
- Reduce memory footprint for large scene files and high-resolution images through compression

src-tauri/Cargo.lock

@@ -3559,6 +3559,7 @@ version = "0.1.1"
 dependencies = [
  "arboard",
  "base64 0.22.1",
+ "flate2",
  "image",
  "serde",
  "serde_json",

src-tauri/Cargo.toml

@@ -28,6 +28,7 @@ serde_json = "1"
 base64 = "0.22"
 image = "0.25"
 arboard = "3"
+flate2 = "1.0"  # zlib 压缩
 
 [target.'cfg(windows)'.dependencies]
 windows = { version = "0.58", features = [

src-tauri/src/commands/file.rs

@@ -2,8 +2,12 @@
 // Handles scene save/load and file reading operations
 
 use std::fs;
+use std::io::{Read, Write};
 use std::path::Path;
 use base64::{Engine as _, engine::general_purpose::STANDARD as BASE64};
+use flate2::Compression;
+use flate2::read::ZlibDecoder;
+use flate2::write::ZlibEncoder;
 use serde::{Deserialize, Serialize};
 use tauri_plugin_dialog::{DialogExt, FilePath};
 use tauri::AppHandle;
@@ -15,16 +19,51 @@ pub struct FileDialogResult {
     pub cancelled: bool,
 }
 
-/// Save scene data to a file
+/// 文件魔数，用于识别压缩格式
+const COMPRESSED_MAGIC: &[u8] = b"PURGIFZ1";
+
+/// Save scene data to a file (with zlib compression)
 #[tauri::command]
 pub async fn save_scene(path: String, data: String) -> Result<(), String> {
-    fs::write(&path, data).map_err(|e| format!("Failed to save scene: {}", e))
+    // 使用 zlib 压缩数据
+    let mut encoder = ZlibEncoder::new(Vec::new(), Compression::default());
+    encoder.write_all(data.as_bytes())
+        .map_err(|e| format!("Failed to compress data: {}", e))?;
+    let compressed = encoder.finish()
+        .map_err(|e| format!("Failed to finish compression: {}", e))?;
+    
+    // 写入魔数 + 压缩数据
+    let mut output = Vec::with_capacity(COMPRESSED_MAGIC.len() + compressed.len());
+    output.extend_from_slice(COMPRESSED_MAGIC);
+    output.extend_from_slice(&compressed);
+    
+    let output_len = output.len();
+    fs::write(&path, output).map_err(|e| format!("Failed to save scene: {}", e))?;
+    
+    println!("Scene saved: {} bytes -> {} bytes (compressed)", data.len(), output_len);
+    Ok(())
 }
 
-/// Load scene data from a file
+/// Load scene data from a file (supports both compressed and uncompressed)
 #[tauri::command]
 pub async fn load_scene(path: String) -> Result<String, String> {
-    fs::read_to_string(&path).map_err(|e| format!("Failed to load scene: {}", e))
+    let data = fs::read(&path).map_err(|e| format!("Failed to read scene: {}", e))?;
+    
+    // 检查是否是压缩格式
+    if data.starts_with(COMPRESSED_MAGIC) {
+        // 解压缩
+        let compressed = &data[COMPRESSED_MAGIC.len()..];
+        let mut decoder = ZlibDecoder::new(compressed);
+        let mut decompressed = String::new();
+        decoder.read_to_string(&mut decompressed)
+            .map_err(|e| format!("Failed to decompress data: {}", e))?;
+        
+        println!("Scene loaded: {} bytes -> {} bytes (decompressed)", data.len(), decompressed.len());
+        Ok(decompressed)
+    } else {
+        // 旧格式，直接读取为字符串
+        String::from_utf8(data).map_err(|e| format!("Failed to parse scene: {}", e))
+    }
 }
 
 /// Read a file and return its contents as base64

src-tauri/tauri.conf.json

@@ -25,7 +25,8 @@
     ],
     "security": {
       "csp": null
-    }
+    },
+    "withGlobalTauri": false
   },
   "bundle": {
     "active": true,