ref: 128a8678fff4dca8cac1da8baa0006b048249b60
dir: /test.zig/
const std = @import("std");
var display: *Display = undefined;
var _screen: ?*Screen = null;
var screen: ?*Image = null;
pub fn main() !void {
const ally = std.heap.page_allocator;
initDraw(ally, null, "bruh") catch |e| {
std.debug.print("errstr: {s}\n", .{std.os.plan9.errstr()});
return e;
};
}
pub fn parseIntSkipPreceedingSpaces(comptime T: type, buf: []const u8) !T {
var i: u32 = 0;
while (buf[i] == ' ') i += 1;
const int = try std.fmt.parseInt(T, buf[i..], 10);
return int;
}
pub const Image = struct {
display: *Display, // display holding data
id: u32, // id of system-held Image
r: Rectangle, // rectangle in data area, local coords
clipr: Rectangle, // clipping region
depth: u32, // number of bits per pixel
chan: Chan,
repl: bool, // flag: data replicates to tile clipr
screen: ?*Screen, // 0 if not a window
next: ?*Image, // next in list of windows
fn allocScreen(image: *Image, fill: *Image, public: bool) !*Screen {
const d = image.display;
if (d != fill.display)
return error.ImageAndFillOnDifferentDisplays;
var s = try d.ally.create(Screen);
errdefer d.ally.destroy(s);
if (screenid == 0) {
screenid = std.os.plan9.getpid();
}
var id: u32 = 0;
var trys: usize = 0;
while (trys < 25) : (trys += 1) {
var bs = try d.bufImage(1 + 4 + 4 + 4 + 1);
var a = bs.writer();
screenid += 1;
id = screenid & 0xffff; // old devdraw bug
a.writeByte('A') catch unreachable;
a.writeIntLittle(u32, id) catch unreachable;
a.writeIntLittle(u32, image.id) catch unreachable;
a.writeIntLittle(u32, fill.id) catch unreachable;
a.writeByte(@intFromBool(public)) catch unreachable;
try d.flushImage(false);
}
s.display = d;
s.id = id;
s.image = image;
s.fill = fill;
return s;
}
};
var screenid: u32 = 0;
pub const Rectangle = struct {
min: Point,
max: Point,
pub fn init(min_x: i32, min_y: i32, max_x: i32, max_y: i32) Rectangle {
return .{
.min = .{
.x = min_x,
.y = min_y,
},
.max = .{
.x = max_x,
.y = max_y,
},
};
}
pub fn isBad(self: Rectangle) bool {
const x = self.dX();
const y = self.dY();
if (x > 0 and y > 0) {
const z = x * y;
if (@divFloor(z, x) == y and z < 0x10000000) return false;
}
return true;
}
pub fn dX(self: Rectangle) i64 {
return self.max.x - self.min.x;
}
pub fn dY(self: Rectangle) i64 {
return self.max.y - self.min.y;
}
pub fn inset(self: Rectangle, n: i32) Rectangle {
var r = self;
r.min.x += n;
r.min.y += n;
r.max.x -= n;
r.max.y -= n;
return r;
}
};
pub const Screen = struct {
display: *Display, // display holding data
id: u32, // id of system-held Screen
image: *Image, // unused; for reference only
fill: *Image, // color to paint behind windows
};
pub const Point = struct { x: i32, y: i32 };
pub const Display = struct {
ally: std.mem.Allocator,
qlock: void, // some sort of mutex???
locking: bool, // program is using lockdisplay
dirno: u32, // the window id
fd: std.fs.File,
reffd: std.fs.File,
ctlfd: std.fs.File,
imageid: u32 = 0,
local: u32,
@"error": void, // void (*error)(Display*, char*);
devdir: []const u8 = "/dev",
windir: []const u8 = "/dev",
oldlabel: [64]u8,
dataqid: u64,
white: *Image,
black: *Image,
@"opaque": *Image,
transparent: *Image,
image: ?*Image,
buf: []u8,
bufsize: u32,
bufp: [*]u8,
defaultfont: void, // TODO deal with this
subfont: void, // TODO deal with this
windows: ?*Image,
screenimage: ?*Image,
_isnewdisplay: bool,
pub fn init(ally: std.mem.Allocator, options: struct { devdir: []const u8 = "/dev", windir: []const u8 = "/dev" }) !*Display {
const NINFO = 12 * 12;
var info: [NINFO + 1]u8 = undefined;
var buf: [512]u8 = undefined;
var image: ?*Image = null;
const ctlfd = try std.fs.openFileAbsolute(try std.fmt.bufPrint(&buf, "{s}/draw/new", .{options.devdir}), .{ .mode = .read_write });
errdefer ctlfd.close();
var n = try ctlfd.read(&info);
if (n < 12) {
return error.InvalidReadFromDrawCtl;
}
if (n == NINFO + 1) n = NINFO;
info[n] = 0;
const infoslice = info[0..n];
var isnew: bool = false;
if (n < NINFO) isnew = true;
const winnum = try parseIntSkipPreceedingSpaces(u32, infoslice[0 .. 1 * 12 - 1]);
const datafd = try std.fs.openFileAbsolute(try std.fmt.bufPrint(&buf, "{s}/draw/{d}/data", .{ options.devdir, winnum }), .{ .mode = .read_write });
errdefer datafd.close();
const reffd = try std.fs.openFileAbsolute(try std.fmt.bufPrint(&buf, "{s}/draw/{d}/refresh", .{ options.devdir, winnum }), .{});
errdefer reffd.close();
const disp = try ally.create(Display);
disp.ally = ally;
if (n >= NINFO) {
image = try ally.create(Image);
errdefer ally.destroy(image.?);
const chan = Chan.fromString(infoslice[2 * 12 .. 3 * 12 - 1]);
image.?.* = .{
.display = disp,
.id = 0,
.chan = chan,
.depth = chan.getDepth(),
.repl = try parseIntSkipPreceedingSpaces(u32, infoslice[3 * 12 .. 4 * 12 - 1]) != 0,
.r = .{
.min = .{
.x = try parseIntSkipPreceedingSpaces(i32, infoslice[4 * 12 .. 5 * 12 - 1]),
.y = try parseIntSkipPreceedingSpaces(i32, infoslice[5 * 12 .. 6 * 12 - 1]),
},
.max = .{
.x = try parseIntSkipPreceedingSpaces(i32, infoslice[6 * 12 .. 7 * 12 - 1]),
.y = try parseIntSkipPreceedingSpaces(i32, infoslice[7 * 12 .. 8 * 12 - 1]),
},
},
.clipr = .{
.min = .{
.x = try parseIntSkipPreceedingSpaces(i32, infoslice[8 * 12 .. 9 * 12 - 1]),
.y = try parseIntSkipPreceedingSpaces(i32, infoslice[9 * 12 .. 10 * 12 - 1]),
},
.max = .{
.x = try parseIntSkipPreceedingSpaces(i32, infoslice[10 * 12 .. 11 * 12 - 1]),
.y = try parseIntSkipPreceedingSpaces(i32, infoslice[11 * 12 .. 12 * 12 - 1]),
},
},
.screen = null,
.next = null,
};
}
// TODO refactor this into a disp.* = .{ ... } expression
const bufsize_iounit = iounit(datafd);
const bufsz = if (bufsize_iounit == 0) 8000 else if (disp.bufsize < 512) return error.IounitTooSmall else bufsize_iounit;
disp.* = .{
.ally = ally,
.dirno = winnum,
.fd = datafd,
.reffd = reffd,
.ctlfd = ctlfd,
.imageid = 0,
.local = 0,
.devdir = options.devdir,
.windir = options.windir,
.oldlabel = .{0} ** 64,
.dataqid = 0,
.white = undefined, // filled in later
.black = undefined, // filled in later
.@"opaque" = undefined, // filled in later
.transparent = undefined, // filled in later
.buf = undefined, // filled in later
.bufsize = bufsz,
.bufp = undefined, // filled in later
.windows = null,
.screenimage = null,
._isnewdisplay = isnew,
.qlock = {}, // TODO make this an actual lock
.locking = false,
.@"error" = {}, // TODO audit if we need this
.image = image,
.defaultfont = {},
.subfont = {},
};
disp.buf = try ally.alloc(u8, bufsz + 5); // +5 for flush message;
errdefer ally.free(disp.buf);
disp.bufp = disp.buf.ptr;
disp.white = try disp.allocImage(Rectangle.init(0, 0, 1, 1), Chan.GREY1, true, DColor.White);
disp.black = try disp.allocImage(Rectangle.init(0, 0, 1, 1), Chan.GREY1, true, DColor.Black);
// disp.error = error;
disp.windir = try ally.dupe(u8, options.windir);
errdefer ally.free(disp.windir);
disp.devdir = try ally.dupe(u8, options.devdir);
errdefer ally.free(disp.devdir);
// qlock(&disp.qlock)
disp.@"opaque" = disp.white;
disp.transparent = disp.black;
return disp;
}
pub fn allocImage(self: *Display, r: Rectangle, chan: Chan, repl: bool, col: u32) !*Image {
return self._allocImage(null, r, chan, repl, col, 0, .backup);
}
fn _allocImage(self: *Display, ai: ?*Image, r: Rectangle, chan: Chan, repl: bool, col: u32, _screenid: u32, refresh: Refresh) !*Image {
if (r.isBad()) {
return error.BadRect;
}
if (@intFromEnum(chan) == 0) {
return error.BadChanDesc;
}
const depth = chan.getDepth();
if (depth == 0) {
return error.BadChanDesc;
}
var bs = try self.bufImage(1 + 4 + 4 + 1 + 4 + 1 + 4 * 4 + 4 * 4 + 4);
var a = bs.writer();
self.imageid += 1;
const id = self.imageid;
// start writing the protocol
// everything is little endian
a.writeByte('b') catch unreachable;
a.writeIntLittle(u32, id) catch unreachable;
a.writeIntLittle(u32, _screenid) catch unreachable;
a.writeByte(@intFromEnum(refresh)) catch unreachable;
a.writeIntLittle(u32, @intFromEnum(chan)) catch unreachable;
a.writeByte(@intFromBool(repl)) catch unreachable;
a.writeIntLittle(i32, r.min.x) catch unreachable;
a.writeIntLittle(i32, r.min.y) catch unreachable;
a.writeIntLittle(i32, r.max.x) catch unreachable;
a.writeIntLittle(i32, r.max.y) catch unreachable;
const clipr = if (!repl)
Rectangle.init(-0x3FFFFFFF, -0x3FFFFFFF, 0x3FFFFFFF, 0x3FFFFFFF)
else
r;
a.writeIntLittle(i32, clipr.min.x) catch unreachable;
a.writeIntLittle(i32, clipr.min.y) catch unreachable;
a.writeIntLittle(i32, clipr.max.x) catch unreachable;
a.writeIntLittle(i32, clipr.max.y) catch unreachable;
a.writeIntLittle(u32, col) catch unreachable;
var i: *Image = undefined;
if (ai) |image| {
i = image;
} else {
i = self.ally.create(Image) catch {
try self.freeRemote(id, .image);
return error.OutOfMemory;
};
errdefer self.ally.destroy(i);
}
i.* = .{ .display = self, .id = id, .depth = depth, .chan = chan, .r = r, .clipr = clipr, .repl = repl, .screen = null, .next = null };
return i;
}
pub fn namedImage(self: *Display, name: []const u8) !*Image {
if (name.len > 256) {
return error.ImageNameTooLong;
}
self.flushImage(false) catch {};
var bs = try self.bufImage(1 + 4 + 1 + name.len);
var a = bs.writer();
self.imageid += 1;
const id = self.imageid;
a.writeByte('n') catch unreachable;
a.writeIntLittle(u32, id) catch unreachable;
a.writeByte(@intCast(name.len)) catch unreachable;
a.writeAll(name) catch unreachable;
try self.flushImage(false);
var buf: [12 * 12 + 1]u8 = undefined;
if (try self.ctlfd.pread(&buf, 0) < 12 * 12) {
return error.CtlReadTooShort;
}
buf[12 * 12] = 0;
var i = self.ally.create(Image) catch {
try self.freeRemote(id, .image);
try self.flushImage(false);
return error.OutOfMemory;
};
errdefer self.ally.destroy(i);
const chan = Chan.fromString(buf[2 * 12 .. 3 * 12 - 1]);
i.* = .{
.display = self,
.id = id,
.chan = chan,
.depth = chan.getDepth(),
.repl = try parseIntSkipPreceedingSpaces(u32, buf[3 * 12 .. 4 * 12 - 1]) != 0,
.r = .{
.min = .{
.x = try parseIntSkipPreceedingSpaces(i32, buf[4 * 12 .. 5 * 12 - 1]),
.y = try parseIntSkipPreceedingSpaces(i32, buf[5 * 12 .. 6 * 12 - 1]),
},
.max = .{
.x = try parseIntSkipPreceedingSpaces(i32, buf[6 * 12 .. 7 * 12 - 1]),
.y = try parseIntSkipPreceedingSpaces(i32, buf[7 * 12 .. 8 * 12 - 1]),
},
},
.clipr = .{
.min = .{
.x = try parseIntSkipPreceedingSpaces(i32, buf[8 * 12 .. 9 * 12 - 1]),
.y = try parseIntSkipPreceedingSpaces(i32, buf[9 * 12 .. 10 * 12 - 1]),
},
.max = .{
.x = try parseIntSkipPreceedingSpaces(i32, buf[10 * 12 .. 11 * 12 - 1]),
.y = try parseIntSkipPreceedingSpaces(i32, buf[11 * 12 .. 12 * 12 - 1]),
},
},
.screen = null,
.next = null,
};
return i;
}
fn _allocWindow(self: *Display, i: *Image, s: *Screen, r: Rectangle, ref: Refresh, col: u32) !*Image {
var im = try self._allocImage(i, r, self.screenimage.?.chan, false, col, s.id, ref);
im.screen = s;
im.next = self.windows;
self.windows = im;
return im;
}
fn freeRemote(self: *Display, id: u32, t: enum { image, screen }) !void {
var bs = try self.bufImage(1 + 4);
const a = bs.writer();
const c: u8 = if (t == .image) 'f' else 'F';
a.writeByte(c) catch unreachable;
a.writeIntLittle(u32, id) catch unreachable;
}
fn freeImage1(i: ?*Image) !void {
if (i == null) {
return;
}
const image = i.?;
const d = image.display;
if (image.screen != null) {
var w: ?*Image = d.windows;
if (w.? == i) {
d.windows = image.next;
} else {
while (w != null) {
if (w.?.next == i) {
w.?.next = i.?.next;
break;
}
w = w.?.next;
}
}
}
try d.freeRemote(image.id, .image);
}
fn freeImage(i: ?*Image) !void {
_ = i;
// try freeImage1(i);
// if (i != null) i.?.display.ally.destroy(i.?);
}
pub fn bufImage(self: *Display, n: usize) !std.io.FixedBufferStream([]u8) {
if (n > self.bufsize) {
return error.BadCountBufSize;
}
if (@intFromPtr(self.bufp + n) > @intFromPtr(self.buf.ptr + self.bufsize)) {
try self.flush();
}
const p = self.bufp;
self.bufp += n;
return std.io.fixedBufferStream(p[0..n]);
}
pub fn flush(self: *Display) !void {
const n: i64 = @intCast(@intFromPtr(self.bufp) - @intFromPtr(self.buf.ptr));
if (n <= 0) return error.UnableToFlushInvalidN;
std.debug.print("about to flush: {}\n{s}\n", .{ std.fmt.fmtSliceHexLower(self.buf[0..@intCast(n)]), self.buf[0..@intCast(n)] });
if ((self.fd.write(self.buf[0..@intCast(n)]) catch return error.UnableToFlushWrite) != n) {
self.bufp = self.buf.ptr; // might as well; chance of continuing
return error.UnableToFlushN;
}
self.bufp = self.buf.ptr;
}
pub fn flushImage(self: *Display, visible: bool) !void {
if (visible) {
self.bufp[0] = 'v';
self.bufp += 1;
if (self._isnewdisplay) {
std.mem.writeIntLittle(u32, self.bufp[0..4], self.screenimage.?.id);
}
}
return self.flush();
}
pub fn genGetWindow(self: *Display, winname: []const u8, winp: *?*Image, scrp: *?*Screen, ref: Refresh) !void {
var buf: [64 + 1]u8 = undefined;
var obuf: [64 + 1]u8 = undefined;
var image: ?*Image = null;
obuf[0] = 0;
while (true) {
const fd = std.fs.openFileAbsolute(winname, .{}) catch {
std.mem.copyForwards(u8, &buf, "noborder");
image = self.image;
break;
};
var n: ?usize = fd.read(buf[0..64]) catch null;
if (n == 0) n = null; // TODO do I need this?
if (n == null) {
fd.close();
std.mem.copyForwards(u8, &buf, "noborder");
image = self.image;
break;
}
// we correctly read in to buf
fd.close();
image = self.namedImage(buf[0..n.?]) catch |err| {
std.debug.print("namedImage: {}\n", .{err});
if (!std.mem.eql(u8, buf[0..n.?], obuf[0..n.?])) {
std.debug.print("trying to fix the race\n", .{});
std.mem.copyForwards(u8, obuf[0..n.?], buf[0..n.?]);
continue;
}
break;
};
break;
}
if (winp.*) |i| {
_ = i;
// try freeImage1(i);
// if (scrp.*.?.image != self.image)
// try freeImage(scrp.*.?.image);
// self.freeScreen(scrp.*.?);
scrp.* = null;
}
if (image == null) {
winp.* = null;
self.screenimage = null;
return error.CouldNotGetImage; // TODO audit this error
}
self.screenimage = image.?;
scrp.* = image.?.allocScreen(self.white, false) catch |err| {
winp.* = null;
self.screenimage = null;
if (image != self.image) {
try freeImage(image);
}
return err;
};
const i = image.?;
var r = i.r;
if (!std.mem.eql(u8, buf[0..8], "noborder")) {
r = r.inset(Borderwidth);
}
std.debug.print("about to call _allocWindow", .{});
std.debug.print("winp: {*}", .{winp.*.?});
winp.* = self._allocWindow(winp.*.?, scrp.*.?, r, ref, DColor.White) catch |err| {
std.debug.print("could not alloc window {}\n", .{err});
// self.freeScreen(scrp.*.?);
scrp.* = null;
self.screenimage = null;
if (image != self.image)
try freeImage(image);
return err;
};
self.screenimage = winp.*;
}
};
fn iounit(file: std.fs.File) u32 {
var buf: [128]u8 = undefined;
const f = std.fmt.bufPrint(&buf, "/fd/{d}ctl", .{file.handle}) catch unreachable;
const cfd = std.fs.openFileAbsolute(f, .{}) catch return 0;
defer cfd.close();
const i = cfd.read(&buf) catch 0;
if (i == 0)
return 0;
const str = buf[0..i];
var toks = std.mem.tokenizeSequence(u8, str, " ");
var j: usize = 0;
// skip the first 7
while (j < 7) : (j += 1) _ = toks.next() orelse return 0;
const iounit_str = toks.next() orelse return 0;
return std.fmt.parseInt(u32, iounit_str, 10) catch return 0;
}
pub const Chan = enum(u32) {
pub const Color = struct {
const Red = 0;
const Green = 1;
const Blue = 2;
const Grey = 3;
const Alpha = 4;
const Map = 5;
const Ignore = 6;
};
pub const NChan = 7;
GREY1 = chan1(Color.Grey, 1),
GREY2 = chan1(Color.Grey, 2),
GREY4 = chan1(Color.Grey, 4),
GREY8 = chan1(Color.Grey, 8),
CMAP8 = chan1(Color.Map, 8),
RGB15 = chan4(Color.Ignore, 1, Color.Red, 5, Color.Green, 5, Color.Blue, 5),
RGB16 = chan3(Color.Red, 5, Color.Green, 6, Color.Blue, 5),
RGB24 = chan3(Color.Red, 8, Color.Green, 8, Color.Blue, 8),
RGBA32 = chan4(Color.Red, 8, Color.Green, 8, Color.Blue, 8, Color.Alpha, 8),
ARGB32 = chan4(Color.Alpha, 8, Color.Red, 8, Color.Green, 8, Color.Blue, 8),
XRGB32 = chan4(Color.Ignore, 8, Color.Red, 8, Color.Green, 8, Color.Blue, 8),
BGR24 = chan3(Color.Blue, 8, Color.Green, 8, Color.Red, 8),
ABGR32 = chan4(Color.Alpha, 8, Color.Blue, 8, Color.Green, 8, Color.Red, 8),
XBGR32 = chan4(Color.Ignore, 8, Color.Blue, 8, Color.Green, 8, Color.Red, 8),
_,
const channames: []const u8 = "rgbkamx";
pub fn fromString(str: []const u8) Chan {
// strip str
const spaces: []const u8 = &.{ ' ', '\t', '\r', '\n' };
const pos = std.mem.indexOfNone(u8, str, spaces).?;
const s = str[pos..];
var depth: u32 = 0;
var chan: u32 = 0;
var i: usize = 0;
const chan_ = blk: {
while (i < s.len) : (i += 2) {
if (std.ascii.isWhitespace(s[i])) break;
if (std.mem.indexOfScalar(u8, channames, s[0])) |ty| {
const n = std.fmt.parseInt(u8, s[i + 1 .. i + 2], 10) catch break :blk 0;
depth += n;
chan <<= 8;
chan |= dc(@intCast(ty), @intCast(n));
} else break :blk 0;
}
if (depth == 0 or (depth > 8 and depth % 8 != 0) or (depth < 8 and 8 % depth != 0)) break :blk 0;
break :blk chan;
};
return @enumFromInt(chan_);
}
pub fn getDepth(self: Chan) u32 {
var depth: u32 = 0;
var c: u32 = @intFromEnum(self);
while (c != 0) : (c >>= 8) {
depth += cdepth(c);
}
if (depth == 0 or (depth > 8 and depth % 8 != 0) or (depth < 8 and 8 % depth != 0)) return 0;
return depth;
}
fn dc(ty: u32, nbit: u32) u32 {
return ((ty & 15) << 4) | (nbit & 15);
}
fn cdepth(c: u32) u32 {
return c & 0xf;
}
pub fn chan1(a: u32, b: u32) u32 {
return dc(a, b);
}
pub fn chan2(a: u32, b: u32, c: u32, d: u32) u32 {
return chan1(a, b) << 8 | dc(c, d);
}
pub fn chan3(a: u32, b: u32, c: u32, d: u32, e: u32, f: u32) u32 {
return chan2(a, b, c, d) << 8 | dc(e, f);
}
pub fn chan4(a: u32, b: u32, c: u32, d: u32, e: u32, f: u32, g: u32, h: u32) u32 {
return chan3(a, b, c, d, e, f) << 8 | dc(g, h);
}
};
pub const DColor = struct {
pub const Opaque = 0xFFFFFFFF;
pub const Transparent = 0x00000000; // only useful for allocimage, memfillcolor
pub const Black = 0x000000FF;
pub const White = 0xFFFFFFFF;
pub const Red = 0xFF0000FF;
pub const Green = 0x00FF00FF;
pub const Blue = 0x0000FFFF;
pub const Cyan = 0x00FFFFFF;
pub const Magenta = 0xFF00FFFF;
pub const Yellow = 0xFFFF00FF;
pub const Paleyellow = 0xFFFFAAFF;
pub const Darkyellow = 0xEEEE9EFF;
pub const Darkgreen = 0x448844FF;
pub const Palegreen = 0xAAFFAAFF;
pub const Medgreen = 0x88CC88FF;
pub const Darkblue = 0x000055FF;
pub const Palebluegreen = 0xAAFFFFFF;
pub const Paleblue = 0x0000BBFF;
pub const Bluegreen = 0x008888FF;
pub const Greygreen = 0x55AAAAFF;
pub const Palegreygreen = 0x9EEEEEFF;
pub const Yellowgreen = 0x99994CFF;
pub const Medblue = 0x000099FF;
pub const Greyblue = 0x005DBBFF;
pub const Palegreyblue = 0x4993DDFF;
pub const Purpleblue = 0x8888CCFF;
pub const Notacolor = 0xFFFFFF00;
pub const Nofill = Notacolor;
};
pub const Borderwidth = 4;
/// Refresh methods
pub const Refresh = enum(u8) {
backup = 0,
none = 1,
mesg = 2,
};
pub fn initDraw(ally: std.mem.Allocator, fontname: ?[]const u8, label: ?[]const u8) !void { // TODO we are skipping the error function. I think this is okay since we do errors different in zig
return genInitDraw(
ally,
"/dev",
fontname,
label,
"/dev",
.none,
);
}
pub fn genInitDraw(ally: std.mem.Allocator, devdir: []const u8, fontname: ?[]const u8, label: ?[]const u8, windir: []const u8, ref: Refresh) !void {
var buf: [128]u8 = undefined;
display = try Display.init(ally, .{ .devdir = devdir, .windir = windir });
// TODO deal with fonts
_ = fontname;
if (label) |l| blk: {
const labelfds = std.fmt.bufPrint(&buf, "{s}/label", .{display.windir}) catch break :blk;
const labelfd = std.fs.openFileAbsolute(labelfds, .{ .mode = .read_write }) catch break :blk;
defer labelfd.close();
_ = try labelfd.write(l);
}
const winnamefds = std.fmt.bufPrint(&buf, "{s}/winname", .{display.windir}) catch unreachable;
try display.genGetWindow(winnamefds, &screen, &_screen, ref);
}