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Fix text scaling in Bar

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Before, we were missing the initial events from the wl_output, including
the scale. This meant that we weren't scaling the bar clock correctly.
To fix it, we just moved the wl_global binding into the .wl_output event

We also got rid of the hashmap of outputs in Globals and Context.
This commit is contained in:
Ben Buhse 2026-02-16 19:09:33 -06:00
commit 9b0bac12ff
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GPG key ID: 7916ACFCD38FD0B4
4 changed files with 22 additions and 52 deletions
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6
src/Bar.zig
View file

@ -88,7 +88,9 @@ pub fn initSurface(bar: *Bar) !void {
// TODO: Add padding to config
const vertical_padding = 5;
const bar_height: u31 = @intCast(bar.fcft_fonts.height + 2 * vertical_padding);
// Set size wants logical pixels, so we have to scale the height
const logical_font_height = @divFloor(bar.fcft_fonts.height, @as(i32, bar.font_scale));
const bar_height: u31 = @intCast(logical_font_height + 2 * vertical_padding);
layer_surface.setSize(0, bar_height);
layer_surface.setAnchor(.{ .top = options.position == .top, .bottom = options.position == .bottom, .left = true, .right = true });
@ -366,7 +368,7 @@ fn getFcftFonts(fonts: []const u8, scale: u31) !*fcft.Font {
while (it.next()) |font| {
if (scale > 1) {
// If scale >1, we append :dpi so we can scale the font
log.debug("bwbuhse {d} {d}", .{ base_dpi, scale });
log.debug("Scaling font DPI: base={d} scale={d}", .{ base_dpi, scale });
const scaled = try arena_alloc.dupeZ(
u8,
try std.fmt.allocPrint(arena_alloc, "{s}:dpi={}", .{ font, @as(u32, base_dpi) * scale }),

3
src/Context.zig
View file

@ -14,7 +14,6 @@ wl_compositor: *wl.Compositor,
wl_display: *wl.Display,
wl_registry: *wl.Registry,
wl_shm: *wl.Shm,
wl_outputs: *std.AutoHashMapUnmanaged(u32, *wl.Output),
river_layer_shell_v1: *river.LayerShellV1,
zwlr_layer_shell_v1: *zwlr.LayerShellV1,
@ -52,7 +51,6 @@ pub const Options = struct {
wl_display: *wl.Display,
wl_registry: *wl.Registry,
wl_shm: *wl.Shm,
wl_outputs: *std.AutoHashMapUnmanaged(u32, *wl.Output),
river_input_manager_v1: *river.InputManagerV1,
river_libinput_config_v1: *river.LibinputConfigV1,
@ -93,7 +91,6 @@ pub fn create(options: Options) !*Context {
.wl_display = options.wl_display,
.wl_registry = options.wl_registry,
.wl_shm = options.wl_shm,
.wl_outputs = options.wl_outputs,
.river_layer_shell_v1 = options.river_layer_shell_v1,
.zwlr_layer_shell_v1 = options.zwlr_layer_shell_v1,
.wallpaper_image = loadWallpaperImage(options.config),

30
src/Output.zig
View file

@ -129,6 +129,7 @@ pub fn destroy(output: *Output) void {
output.tag_layout_overrides.deinit(utils.gpa);
output.deinitWallpaperLayerSurface();
if (output.wl_output) |wl_output| wl_output.release();
output.river_output_v1.destroy();
output.river_layer_shell_output_v1.destroy();
utils.gpa.destroy(output);
@ -217,26 +218,19 @@ fn riverOutputListener(river_output_v1: *river.OutputV1, event: river.OutputV1.E
output.destroy();
},
.wl_output => |ev| {
// It's guaranteed for the wl_output global to advertised before this event happens
output.wl_output = output.context.wl_outputs.get(ev.name).?;
output.wl_output.?.setListener(*Output, wlOutputListener, output);
// The wl_output's initial events come during the initial roundtrip
// before we set our listener, so the .done event that triggers
// wallpaper init was lost. Explicitly init the surfaces here.
output.initWallpaperLayerSurface() catch |err| {
const output_name = output.name orelse "some output";
log.err("failed to add a surface to {s}: {}", .{ output_name, err });
};
if (output.bar) |*bar| {
bar.initSurface() catch |err| {
const output_name = output.name orelse "some output";
log.err("failed to init bar for {s}: {}", .{ output_name, err });
// Bind the wl_output here so that our listener is set before the server sends the
// initial events (.scale, .mode, .name, .done, etc.). The .done handler will init
// bar/wallpaper surfaces.
const wl_output = output.context.wl_registry.bind(
ev.name,
wl.Output,
4,
) catch |err| {
log.err("Failed to bind wl_output: {}", .{err});
return;
};
}
// Tag overlay surfaces are created on-demand when tags change,
// so we don't init them here.
wl_output.setListener(*Output, wlOutputListener, output);
output.wl_output = wl_output;
},
.dimensions => |ev| {
// Protocol guarantees that width and height are strictly greater than zero

33
src/main.zig
View file

@ -12,17 +12,8 @@ const Globals = struct {
wl_compositor: ?*wl.Compositor = null,
wl_shm: ?*wl.Shm = null,
wl_outputs: std.AutoHashMapUnmanaged(u32, *wl.Output) = .empty,
zwlr_layer_shell_v1: ?*zwlr.LayerShellV1 = null,
fn deinit(globals: *Globals) void {
var it = globals.wl_outputs.valueIterator();
while (it.next()) |output| {
output.*.release();
}
globals.wl_outputs.deinit(utils.gpa);
}
};
const usage: []const u8 =
@ -62,7 +53,6 @@ pub fn main() !void {
const wl_registry = try wl_display.getRegistry();
var globals: Globals = .{};
defer globals.deinit();
wl_registry.setListener(*Globals, registryListener, &globals);
const errno = wl_display.roundtrip();
@ -72,8 +62,6 @@ pub fn main() !void {
const wl_compositor = globals.wl_compositor orelse utils.interfaceNotAdvertised(wl.Compositor);
const wl_shm = globals.wl_shm orelse utils.interfaceNotAdvertised(wl.Shm);
// We can theoretically start with zero wl_outputs; don't panic if it's empty.
const wl_outputs = &globals.wl_outputs;
const river_input_manager_v1 = globals.river_input_manager_v1 orelse utils.interfaceNotAdvertised(river.InputManagerV1);
const river_libinput_config_v1 = globals.river_libinput_config_v1 orelse utils.interfaceNotAdvertised(river.LibinputConfigV1);
@ -88,7 +76,6 @@ pub fn main() !void {
const context = try Context.create(.{
.wl_compositor = wl_compositor,
.wl_display = wl_display,
.wl_outputs = wl_outputs,
.wl_registry = wl_registry,
.wl_shm = wl_shm,
.river_input_manager_v1 = river_input_manager_v1,
@ -268,16 +255,8 @@ fn registryListener(registry: *wl.Registry, event: wl.Registry.Event, globals: *
};
} else if (mem.orderZ(u8, ev.interface, wl.Output.interface.name) == .eq) {
if (ev.version < 4) utils.versionNotSupported(wl.Output, ev.version, 4);
const wl_output = registry.bind(ev.name, wl.Output, 4) catch |e| {
fatal("Failed to bind to wl_output: {any}", .{@errorName(e)});
};
// We can get multiple wl_outputs, so we have to try add them to our HashMap
// instead of just keeping the one
globals.wl_outputs.put(utils.gpa, ev.name, wl_output) catch |e| {
fatal("Failed to add wl_output to hashmap: {any}", .{@errorName(e)});
};
// We don't bind wl_output until the river_output send its .wl_output event
// This way, we don't miss the initial configuration events
} else if (mem.orderZ(u8, ev.interface, wl.Shm.interface.name) == .eq) {
globals.wl_shm = registry.bind(ev.name, wl.Shm, 1) catch |e| {
fatal("Failed to bind to wl_shm: {any}", .{@errorName(e)});
@ -309,11 +288,9 @@ fn registryListener(registry: *wl.Registry, event: wl.Registry.Event, globals: *
};
}
},
.global_remove => |ev| {
// The only remove we care about is for wl_outputs
if (!globals.wl_outputs.remove(ev.name)) {
log.debug("Received a global_remove event for something other than a wl_output", .{});
}
.global_remove => |_| {
// wl_output removal is handled by the river protocol's .removed
// event, and we don't care about any other globals being removed.
},
}
}