Dev

crates/aether-core/src/buffer/piece_table.rs

@@ -410,7 +410,22 @@ impl PieceTable {
         let file = File::open(path)?;
         let mmap = unsafe { Mmap::map(&file)? };
         let len = mmap.len();
-        let line_breaks = count_line_breaks(&mmap);
+        // 单次扫描构建行起始偏移表（替代 count_line_breaks + rebuild_line_index
+        // 的双重全文件扫描，打开大文件时省一半时间；SIMD 查找每次从上次位置继续，
+        // 总体仍是一次遍历）
+        let mut line_starts = Vec::new();
+        line_starts.push(0); // 第0行从字节0开始
+        let mut offset = 0usize;
+        while offset < len {
+            match crate::simd_utils::find_byte_simd(&mmap[offset..], b'\n') {
+                Some(pos) => {
+                    line_starts.push(offset + pos + 1); // 下一行起始
+                    offset += pos + 1; // 跳过已找到的换行符
+                }
+                None => break,
+            }
+        }
+        let line_breaks = (line_starts.len() - 1) as u32;
         let pieces = vec![Piece {
             source: Source::Original,
             start: 0,
@@ -421,14 +436,14 @@ impl PieceTable {
             original: Some(Arc::new(mmap)),
             add_buffer: Vec::new(),
             pieces,
-            line_index: LineIndex::new(),
+            line_index: LineIndex::from_line_starts(line_starts),
             piece_offset_cache: Vec::new(),
             len_chars: len,
             len_lines: line_breaks as usize + 1,
             edit_count: 0,
             coalesce_threshold: 32,
         };
-        pt.rebuild_line_index();
+        pt.rebuild_piece_offset_cache();
         Ok(pt)
     }
 

crates/aether-core/src/char_width.rs

@@ -14,9 +14,15 @@
 /// - 0：组合标记、控制字符、格式控制符（零宽度）
 /// - 1：窄字符（拉丁、希腊、西里尔等）
 /// - 2：宽字符（CJK、全角、Emoji）
+/// - 4：Tab 字符（制表符占 4 格）
 pub fn char_width(c: char) -> usize {
     let cp = c as u32;
 
+    // Tab 字符特殊处理：占 4 格
+    if cp == 0x09 {
+        return 4;
+    }
+
     // ===== 零宽度字符 =====
     if is_zero_width(cp) {
         return 0;

crates/aether-render/Cargo.toml

@@ -8,4 +8,4 @@ aether-core = { path = "../aether-core" }
 rustc-hash = "2"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-windows = { version = "0.58", features = ["Win32_Graphics_Direct2D", "Win32_Graphics_Direct2D_Common", "Win32_Graphics_Dxgi", "Win32_Graphics_Dxgi_Common", "Win32_Graphics_DirectWrite", "Win32_Graphics_Gdi", "Win32_Foundation", "Foundation_Numerics", "Win32_System_Performance", "Win32_System_SystemInformation", "Win32_UI_HiDpi"] }
+windows = { version = "0.58", features = ["Win32_Graphics_Direct2D", "Win32_Graphics_Direct2D_Common", "Win32_Graphics_Dxgi", "Win32_Graphics_Dxgi_Common", "Win32_Graphics_DirectWrite", "Win32_Graphics_Gdi", "Win32_Foundation", "Foundation_Numerics", "Win32_System_Performance", "Win32_System_SystemInformation", "Win32_UI_HiDpi", "Win32_Graphics_Direct3D11", "Win32_Graphics_Direct3D", "Win32_Graphics_Direct3D_Fxc", "Win32_Graphics_Hlsl"] }

crates/aether-render/src/d2d/factory.rs

@@ -234,7 +234,17 @@ impl RenderTarget {
                 },
                 geometricMask: ManuallyDrop::new(Some(group_as_geometry)),
                 maskAntialiasMode: windows::Win32::Graphics::Direct2D::D2D1_ANTIALIAS_MODE_ALIASED,
-                maskTransform: Matrix3x2::default(),
+                // 单位矩阵：保持掩码几何在原始坐标空间。
+                // 注意：Matrix3x2::default() 为全零矩阵（退化变换），会把掩码塌缩为单点，
+                // 导致裁剪帧内所有绘制被丢弃（多矩形脏矩形重绘不生效）。
+                maskTransform: Matrix3x2 {
+                    M11: 1.0,
+                    M12: 0.0,
+                    M21: 0.0,
+                    M22: 1.0,
+                    M31: 0.0,
+                    M32: 0.0,
+                },
                 opacity: 1.0,
                 opacityBrush: ManuallyDrop::new(None),
                 layerOptions: windows::Win32::Graphics::Direct2D::D2D1_LAYER_OPTIONS_NONE,