explicit padding works

src/Window.zig

@@ -82,6 +82,9 @@ io_thr: std.Thread,
 /// The dimensions of the grid in rows and columns.
 grid_size: renderer.GridSize,
 
+/// Explicit padding due to configuration
+padding: renderer.Padding,
+
 /// The app configuration
 config: *const Config,
 
@@ -259,10 +262,21 @@ pub fn create(alloc: Allocator, app: *App, config: *const Config) !*Window {
     });
     errdefer font_group.deinit(alloc);
 
+    // Convert our padding from points to pixels
+    const padding_x = (@intToFloat(f32, config.@"window-padding-x") * x_dpi) / 72;
+    const padding_y = (@intToFloat(f32, config.@"window-padding-y") * y_dpi) / 72;
+    const padding: renderer.Padding = .{
+        .top = padding_y,
+        .bottom = padding_y,
+        .right = padding_x,
+        .left = padding_x,
+    };
+
     // Create our terminal grid with the initial window size
     var renderer_impl = try Renderer.init(alloc, .{
         .font_group = font_group,
         .padding = .{
+            .explicit = padding,
             .balance = config.@"window-padding-balance",
         },
     });
@@ -284,7 +298,7 @@ pub fn create(alloc: Allocator, app: *App, config: *const Config) !*Window {
         .width = window_size.width,
         .height = window_size.height,
     };
-    const grid_size = renderer.GridSize.init(screen_size, renderer_impl.cell_size);
+    const grid_size = renderer_impl.gridSize(screen_size);
 
     // Set a minimum size that is cols=10 h=4. This matches Mac's Terminal.app
     // but is otherwise somewhat arbitrary.
@@ -358,6 +372,7 @@ pub fn create(alloc: Allocator, app: *App, config: *const Config) !*Window {
         .io_thread = io_thread,
         .io_thr = undefined,
         .grid_size = grid_size,
+        .padding = padding,
         .config = config,
 
         .imgui_ctx = if (!DevMode.enabled) {} else try imgui.Context.create(),
@@ -565,13 +580,13 @@ fn sizeCallback(window: glfw.Window, width: i32, height: i32) void {
     // overhead of inter-thread communication
 
     // Recalculate our grid size
-    win.grid_size.update(screen_size, win.renderer.cell_size);
+    win.grid_size = win.renderer.gridSize(screen_size);
 
     // Mail the IO thread
     _ = win.io_thread.mailbox.push(.{
         .resize = .{
             .grid_size = win.grid_size,
-            .screen_size = screen_size,
+            .screen_size = screen_size.subPadding(win.padding),
         },
     }, .{ .forever = {} });
     win.io_thread.wakeup.send() catch {};

src/cli_args.zig

@@ -138,6 +138,12 @@ fn parseIntoField(
                     0,
                 ),
 
+                u32 => try std.fmt.parseInt(
+                    u32,
+                    value orelse return error.ValueRequired,
+                    0,
+                ),
+
                 else => unreachable,
             };
 

src/renderer/OpenGL.zig

@@ -947,21 +947,34 @@ pub fn updateCell(
     return true;
 }
 
+/// Returns the grid size for a given screen size. This is safe to call
+/// on any thread.
+pub fn gridSize(self: *OpenGL, screen_size: renderer.ScreenSize) renderer.GridSize {
+    return renderer.GridSize.init(
+        screen_size.subPadding(self.padding.explicit),
+        self.cell_size,
+    );
+}
+
 /// Set the screen size for rendering. This will update the projection
 /// used for the shader so that the scaling of the grid is correct.
 fn setScreenSize(self: *OpenGL, dim: renderer.ScreenSize) !void {
     // Recalculate the rows/columns.
-    const grid_size = renderer.GridSize.init(dim, self.cell_size);
+    const grid_size = self.gridSize(dim);
 
-    // Determine if we need to pad the window. For "auto" padding, we take
-    // the leftover amounts on the right/bottom that don't fit a full grid cell
-    // and we split them equal across all boundaries.
-    const padding: renderer.Padding = if (self.padding.balance)
+    // Apply our padding
+    const padding = self.padding.explicit.add(if (self.padding.balance)
         renderer.Padding.balanced(dim, grid_size, self.cell_size)
-    else .{};
+    else .{});
     const padded_dim = dim.subPadding(padding);
 
-    log.debug("screen size padded={} screen={} grid={} cell={}", .{ padded_dim, dim, grid_size, self.cell_size });
+    log.debug("screen size padded={} screen={} grid={} cell={} padding={}", .{
+        padded_dim,
+        dim,
+        grid_size,
+        self.cell_size,
+        self.padding.explicit,
+    });
 
     // Update our LRU. We arbitrarily support a certain number of pages here.
     // We also always support a minimum number of caching in case a user
@@ -997,8 +1010,8 @@ fn setScreenSize(self: *OpenGL, dim: renderer.ScreenSize) !void {
             // 2D orthographic projection with the full w/h
             math.ortho2d(
                 -1 * padding.left,
-                @intToFloat(f32, padded_dim.width),
-                @intToFloat(f32, padded_dim.height),
+                @intToFloat(f32, padded_dim.width) + padding.right,
+                @intToFloat(f32, padded_dim.height) + padding.bottom,
                 -1 * padding.top,
             ),
         );

src/renderer/Options.zig

@@ -1,6 +1,7 @@
 //! The options that are used to configure a renderer.
 
 const font = @import("../font/main.zig");
+const renderer = @import("../renderer.zig");
 
 /// The font group that should be used.
 font_group: *font.GroupCache,
@@ -11,10 +12,7 @@ padding: Padding,
 pub const Padding = struct {
     // Explicit padding options, in pixels. The windowing thread is
     // expected to convert points to pixels for a given DPI.
-    top: u32 = 0,
-    bottom: u32 = 0,
-    right: u32 = 0,
-    left: u32 = 0,
+    explicit: renderer.Padding,
 
     // Balance options
     balance: bool = false,

src/renderer/size.zig

@@ -112,6 +112,16 @@ pub const Padding = struct {
             .left = padding_left,
         };
     }
+
+    /// Add another padding to ths one
+    pub fn add(self: Padding, other: Padding) Padding {
+        return .{
+            .top = self.top + other.top,
+            .bottom = self.bottom + other.bottom,
+            .right = self.right + other.right,
+            .left = self.left + other.left,
+        };
+    }
 };
 
 test "GridSize update exact" {