ddidderr
b9ac54e794
First cut of the terminal core memory model from ZIG/src/terminal: size, point, style, hyperlink, ref_counted_set, page and PageList. Design (see docs/rewrite/ARCHITECTURE.md decisions 2-4): - Cell/Row are 8-byte u64 wrappers with Zig's exact bit offsets. - Page owns row/cell Vecs plus style set, grapheme and hyperlink maps; Page::layout reproduces Ghostty's byte-size formula on 64-bit Linux so scrollback-limit pruning matches. - PageList keeps nodes in a generation-checked slab with a free list and list-owned tracked pins addressed by handles. This is explicitly partial (docs/rewrite/notes/ghostty-terminal- pagelist.md): 151/202 PageList tests ported; reflow rebuilds a snapshot instead of Zig's incremental ReflowCursor; point<->pin conversion walks from the list head (no active/viewport caches); RefCountedSet doesn't reproduce probe-dependent ID reuse. A follow-up pass finishes parity. Test Plan: - cargo test -p ghostty-terminal (239 tests)
45 lines
1.2 KiB
Rust
45 lines
1.2 KiB
Rust
//! Integer widths and safe logical offsets used by terminal pages.
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use std::marker::PhantomData;
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/// Maximum addressable page size.
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pub const MAX_PAGE_SIZE: u32 = u32::MAX;
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/// Byte offset within a page.
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pub type OffsetInt = u32;
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/// Number of cells in a grid dimension.
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pub type CellCountInt = u16;
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/// Style capacity and identifiers.
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pub type StyleCountInt = u16;
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/// Hyperlink capacity and identifiers.
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pub type HyperlinkCountInt = u16;
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/// Bytes of grapheme storage.
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pub type GraphemeBytesInt = u32;
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/// Bytes of string storage.
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pub type StringBytesInt = u32;
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/// A typed logical byte offset; never converted to a raw pointer.
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#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
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#[repr(transparent)]
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pub struct Offset<T> {
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offset: u32,
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marker: PhantomData<fn() -> T>,
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}
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impl<T> Offset<T> {
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/// Construct a logical byte offset.
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pub const fn new(offset: u32) -> Self {
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Self {
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offset,
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marker: PhantomData,
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}
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}
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/// Return the byte displacement.
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pub const fn offset(self) -> u32 {
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self.offset
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn offset() {
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assert_eq!(std::mem::size_of::<Offset<u8>>(), 4);
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}
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}
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