use CellType to render text

build.zig

@@ -21,6 +21,9 @@ pub fn build(b: *std.Build) void {
         .root_source_file = b.path("src/x.zig"),
     });
 
+    const celltype_dep = b.dependency("celltype", .{});
+    const celltype_mod = celltype_dep.module("celltype");
+
     const examples_step = b.step("examples", "");
 
     inline for (examples) |example_name| {
@@ -32,6 +35,7 @@ pub fn build(b: *std.Build) void {
             .target = target,
             .imports = &.{
                 .{ .name = "x", .module = x_mod },
+                .{ .name = "celltype", .module = celltype_mod },
             },
         });
 

build.zig.zon

@@ -3,6 +3,11 @@
     .version = "0.0.0",
     .fingerprint = 0x8cdc16832b06463e,
     .minimum_zig_version = "0.14.0",
-    .dependencies = .{},
+    .dependencies = .{
+        .celltype = .{
+            .url = "git+https://github.com/marler8997/CellType#8836a2e3d793bb8062890af071845b41c5b3f26b",
+            .hash = "celltype-0.0.0-hmHVU4JgAgC--FJ5ibbZKcHJBTERK0Y5gwh_ySRHZQV5",
+        },
+    },
     .paths = .{"."},
 }

examples/fontviewer.zig

@@ -1,6 +1,7 @@
 const std = @import("std");
 const x = @import("x");
 const common = @import("common.zig");
+const celltype = @import("celltype");
 
 pub const log_level = std.log.Level.info;
 
@@ -392,6 +393,7 @@ fn render(
     sock: std.posix.socket_t,
     sequence: *u16,
     ids: Ids,
+    image_format: ImageFormat,
     fonts: []x.Slice(u8, [*]const u8),
     font_index: usize,
     font_info: *const x.ServerMsg.QueryFont,
@@ -420,6 +422,27 @@ fn render(
 
     const font_height = font_info.font_ascent + font_info.font_descent;
 
+    {
+        const width = 15;
+        const height = width * 2;
+        var grayscale: [width * height]u8 = undefined;
+        const config = celltype.Config{};
+        const len = celltype.renderText(
+            &config,
+            u16,
+            width,
+            height,
+            celltype.calcStrokeWidth(u16, width, height, celltype.default_weight),
+            &grayscale,
+            width,
+            .{ .output_precleared = false },
+            "A",
+        ) catch |err| switch (err) {
+            error.Utf8Decode => unreachable,
+        };
+        std.debug.assert(len == 1);
+    }
+
     try renderText(sock, sequence, ids.window(), ids.gcText(), 10, 10 + (font_height * 1), "font {}/{}", .{ font_index + 1, fonts.len });
     try renderText(sock, sequence, ids.window(), ids.gcText(), 10, 10 + (font_height * 2), "{s}", .{font_name});
     try renderText(sock, sequence, ids.window(), ids.gcText(), 10, 10 + (font_height * 3), "property_count={} char_info_count={}", .{ font_info.property_count, font_info.info_count });