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)
66 lines
2.0 KiB
Rust
66 lines
2.0 KiB
Rust
//! Coordinates relative to the active area, viewport, screen, or history.
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/// Reference frame for a terminal coordinate.
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#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
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pub enum Tag {
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/// Editable bottommost screen area, including unwritten rows.
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Active,
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/// Visible area, including user scrolling.
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Viewport,
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/// Entire screen including scrollback.
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Screen,
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/// Scrollback preceding the active area.
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History,
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}
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/// An x/y coordinate; history may exceed a single page's row count.
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#[derive(Debug, Default, Copy, Clone, PartialEq, Eq, Hash)]
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pub struct Coordinate {
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/// Column.
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pub x: u16,
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/// Row relative to the point's reference frame.
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pub y: u32,
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}
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impl Coordinate {
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/// Compare both coordinates.
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pub fn eql(self, other: Self) -> bool {
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self == other
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}
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}
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/// A coordinate with its reference frame.
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#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
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pub enum Point {
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/// Editable screen coordinate.
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Active(Coordinate),
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/// Visible viewport coordinate.
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Viewport(Coordinate),
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/// Whole-screen coordinate.
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Screen(Coordinate),
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/// Scrollback coordinate.
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History(Coordinate),
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}
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impl Point {
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/// Construct a point in a given frame.
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pub const fn new(tag: Tag, coord: Coordinate) -> Self {
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match tag {
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Tag::Active => Self::Active(coord),
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Tag::Viewport => Self::Viewport(coord),
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Tag::Screen => Self::Screen(coord),
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Tag::History => Self::History(coord),
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}
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}
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/// Extract its coordinate.
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pub const fn coord(self) -> Coordinate {
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match self {
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Self::Active(v) | Self::Viewport(v) | Self::Screen(v) | Self::History(v) => v,
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}
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}
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/// Extract its reference frame.
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pub const fn tag(self) -> Tag {
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match self {
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Self::Active(_) => Tag::Active,
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Self::Viewport(_) => Tag::Viewport,
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Self::Screen(_) => Tag::Screen,
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Self::History(_) => Tag::History,
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}
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}
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}
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