image rendering and visual selection

src/gpu_types.rs

@@ -13,7 +13,8 @@ pub struct PaneId(pub u64);
 impl PaneId {
     /// Generate a new unique pane ID.
     pub fn new() -> Self {
-        static COUNTER: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(0);
+        static COUNTER: std::sync::atomic::AtomicU64 =
+            std::sync::atomic::AtomicU64::new(0);
         Self(COUNTER.fetch_add(1, std::sync::atomic::Ordering::SeqCst))
     }
 }
@@ -56,19 +57,19 @@ pub const COLORED_GLYPH_FLAG: u32 = 0x80000000;
 /// Pre-rendered cursor sprite indices (like Kitty's cursor_shape_map).
 /// These sprites are created at fixed indices in the sprite array after initialization.
 /// Index 0 is reserved for "no glyph" (empty cell).
-pub const CURSOR_SPRITE_BEAM: u32 = 1;      // Bar/beam cursor (vertical line on left)
+pub const CURSOR_SPRITE_BEAM: u32 = 1; // Bar/beam cursor (vertical line on left)
 pub const CURSOR_SPRITE_UNDERLINE: u32 = 2; // Underline cursor (horizontal line at bottom)
-pub const CURSOR_SPRITE_HOLLOW: u32 = 3;    // Hollow/unfocused cursor (outline rectangle)
+pub const CURSOR_SPRITE_HOLLOW: u32 = 3; // Hollow/unfocused cursor (outline rectangle)
 
 /// Pre-rendered decoration sprite indices (like Kitty's decoration sprites).
 /// These are created after cursor sprites and used for text decorations.
 /// The shader uses these to render underlines, strikethrough, etc.
-pub const DECORATION_SPRITE_STRIKETHROUGH: u32 = 4;    // Strikethrough line
-pub const DECORATION_SPRITE_UNDERLINE: u32 = 5;        // Single underline
+pub const DECORATION_SPRITE_STRIKETHROUGH: u32 = 4; // Strikethrough line
+pub const DECORATION_SPRITE_UNDERLINE: u32 = 5; // Single underline
 pub const DECORATION_SPRITE_DOUBLE_UNDERLINE: u32 = 6; // Double underline
-pub const DECORATION_SPRITE_UNDERCURL: u32 = 7;        // Wavy/curly underline
-pub const DECORATION_SPRITE_DOTTED: u32 = 8;           // Dotted underline
-pub const DECORATION_SPRITE_DASHED: u32 = 9;           // Dashed underline
+pub const DECORATION_SPRITE_UNDERCURL: u32 = 7; // Wavy/curly underline
+pub const DECORATION_SPRITE_DOTTED: u32 = 8; // Dotted underline
+pub const DECORATION_SPRITE_DASHED: u32 = 9; // Dashed underline
 
 /// First available sprite index for regular glyphs (after reserved cursor and decoration sprites)
 pub const FIRST_GLYPH_SPRITE: u32 = 10;
@@ -97,7 +98,8 @@ impl GlyphVertex {
 
     pub fn desc() -> wgpu::VertexBufferLayout<'static> {
         wgpu::VertexBufferLayout {
-            array_stride: std::mem::size_of::<GlyphVertex>() as wgpu::BufferAddress,
+            array_stride: std::mem::size_of::<GlyphVertex>()
+                as wgpu::BufferAddress,
             step_mode: wgpu::VertexStepMode::Vertex,
             attributes: &Self::ATTRIBS,
         }
@@ -238,7 +240,7 @@ pub struct FontCellMetrics {
 /// works in pure NDC space without needing pixel offsets.
 /// Cell dimensions are integers like Kitty for pixel-perfect rendering.
 #[repr(C)]
-#[derive(Copy, Clone, Debug, Default, Pod, Zeroable)]
+#[derive(Copy, Clone, Debug, Pod, Zeroable)]
 pub struct GridParams {
     pub cols: u32,
     pub rows: u32,
@@ -253,6 +255,7 @@ pub struct GridParams {
     pub selection_start_row: i32,
     pub selection_end_col: i32,
     pub selection_end_row: i32,
+    pub selection_row_max_col: [i32; 256],
 }
 
 /// GPU quad instance for instanced rectangle rendering.