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Revert "renderer: slightly optimize screen copy" (#8974)

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This reverts commit fcea09e413 because it
appears to be causing memory leaks.
This commit is contained in:
Mitchell Hashimoto
2025-09-30 09:29:00 -07:00
parent 436bc4c2b9
commit 62ed472d9e
1 changed files with 9 additions and 27 deletions
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36
src/renderer/generic.zig
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@@ -95,9 +95,6 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
/// Allocator that can be used
alloc: std.mem.Allocator,
/// MemoryPool for PageList pages which we use when cloning the screen.
page_pool: terminal.PageList.MemoryPool,
/// This mutex must be held whenever any state used in `drawFrame` is
/// being modified, and also when it's being accessed in `drawFrame`.
draw_mutex: std.Thread.Mutex = .{},
@@ -679,19 +676,8 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
};
errdefer if (display_link) |v| v.release();
// We preheat the page pool with 4 pages- this is an arbitrary
// choice based on what seems reasonable for the number of pages
// used by the viewport area.
var page_pool: terminal.PageList.MemoryPool = try .init(
alloc,
std.heap.page_allocator,
4,
);
errdefer page_pool.deinit();
var result: Self = .{
.alloc = alloc,
.page_pool = page_pool,
.config = options.config,
.surface_mailbox = options.surface_mailbox,
.grid_metrics = font_critical.metrics,
@@ -774,8 +760,6 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
}
pub fn deinit(self: *Self) void {
self.page_pool.deinit();
self.swap_chain.deinit();
if (DisplayLink != void) {
@@ -1108,13 +1092,6 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
full_rebuild: bool,
};
// Empty our page pool, but retain capacity.
self.page_pool.reset(.retain_capacity);
var arena: std.heap.ArenaAllocator = .init(self.alloc);
defer arena.deinit();
const alloc = arena.allocator();
// Update all our data as tightly as possible within the mutex.
var critical: Critical = critical: {
// const start = try std.time.Instant.now();
@@ -1171,12 +1148,12 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
// We used to share terminal state, but we've since learned through
// analysis that it is faster to copy the terminal state than to
// hold the lock while rebuilding GPU cells.
const screen_copy = try state.terminal.screen.clonePool(
alloc,
&self.page_pool,
var screen_copy = try state.terminal.screen.clone(
self.alloc,
.{ .viewport = .{} },
null,
);
errdefer screen_copy.deinit();
// Whether to draw our cursor or not.
const cursor_style = if (state.terminal.flags.password_input)
@@ -1192,8 +1169,9 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
const preedit: ?renderer.State.Preedit = preedit: {
if (cursor_style == null) break :preedit null;
const p = state.preedit orelse break :preedit null;
break :preedit try p.clone(alloc);
break :preedit try p.clone(self.alloc);
};
errdefer if (preedit) |p| p.deinit(self.alloc);
// If we have Kitty graphics data, we enter a SLOW SLOW SLOW path.
// We only do this if the Kitty image state is dirty meaning only if
@@ -1263,6 +1241,10 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
.full_rebuild = full_rebuild,
};
};
defer {
critical.screen.deinit();
if (critical.preedit) |p| p.deinit(self.alloc);
}
// Build our GPU cells
try self.rebuildCells(