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60 lines
2.1 KiB
Zig
60 lines
2.1 KiB
Zig
//! This is the render state that is given to a renderer.
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const std = @import("std");
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const Allocator = std.mem.Allocator;
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const Inspector = @import("../inspector/main.zig").Inspector;
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const terminal = @import("../terminal/main.zig");
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const renderer = @import("../renderer.zig");
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/// The mutex that must be held while reading any of the data in the
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/// members of this state. Note that the state itself is NOT protected
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/// by the mutex and is NOT thread-safe, only the members values of the
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/// state (i.e. the terminal, devmode, etc. values).
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mutex: *std.Thread.Mutex,
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/// The terminal data.
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terminal: *terminal.Terminal,
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/// The terminal inspector, if any. This will be null while the inspector
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/// is not active and will be set when it is active.
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inspector: ?*Inspector = null,
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/// Dead key state. This will render the current dead key preedit text
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/// over the cursor. This currently only ever renders a single codepoint.
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/// Preedit can in theory be multiple codepoints long but that is left as
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/// a future exercise.
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preedit: ?Preedit = null,
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/// The pre-edit state. See Surface.preeditCallback for more information.
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pub const Preedit = struct {
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/// The codepoints to render as preedit text. We allow up to 16 codepoints
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/// as a sort of arbitrary limit. If we experience a realisitic use case
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/// where we need more please open an issue.
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codepoints: [16]Codepoint = undefined,
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len: u8 = 0,
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/// A single codepoint to render as preedit text.
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pub const Codepoint = struct {
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codepoint: u21,
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wide: bool = false,
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};
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/// The width in cells of all codepoints in the preedit.
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pub fn width(self: *const Preedit) usize {
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var result: usize = 0;
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for (self.codepoints[0..self.len]) |cp| {
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result += if (cp.wide) 2 else 1;
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}
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return result;
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}
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pub fn range(self: *const Preedit, start: usize, max: usize) [2]usize {
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// If our preedit goes off the end of the screen, we adjust it so
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// that it shifts left.
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const end = start + self.width();
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const offset = if (end > max) end - max else 0;
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return .{ start -| offset, end -| offset };
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}
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};
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