libghostty: add render state structured cursor read (#13851)

A normal renderer would have to call `ghostty_render_state_get` _eight times_ to reconstruct the cursor. In languages where FFI is expensive (Go, wasm, etc.), this showed up in profiles of every frame. Add a sized cursor snapshot and expose it. Also expose the existing color snapshot through ghostty_render_state_get and remove the older dedicated color getter. Found during my normal Go/wasm adventures.
2026-08-24 16:11:43 +00:00 · 2026-08-15 21:08:27 -07:00
parent 02436fd4eb b4079f00c8
commit 16c833c5f1
6 changed files with 324 additions and 65 deletions
--- a/example/c-vt-render/src/main.c
+++ b/example/c-vt-render/src/main.c
@@ -97,7 +97,8 @@ int main(void) {
  // state. These are needed to resolve palette-indexed cell colors.
  GhosttyRenderStateColors colors =
      GHOSTTY_INIT_SIZED(GhosttyRenderStateColors);
-  result = ghostty_render_state_colors_get(render_state, &colors);
+  result = ghostty_render_state_get(
+      render_state, GHOSTTY_RENDER_STATE_DATA_COLORS, &colors);
  assert(result == GHOSTTY_SUCCESS);

  printf("Background: #%02x%02x%02x\n",
@@ -107,31 +108,16 @@ int main(void) {
  //! [render-colors]

  //! [render-cursor]
-  // Read cursor position and visual style from the render state.
-  bool cursor_visible = false;
-  ghostty_render_state_get(
-      render_state, GHOSTTY_RENDER_STATE_DATA_CURSOR_VISIBLE,
-      &cursor_visible);
-
-  bool cursor_in_viewport = false;
-  ghostty_render_state_get(
-      render_state, GHOSTTY_RENDER_STATE_DATA_CURSOR_VIEWPORT_HAS_VALUE,
-      &cursor_in_viewport);
-
-  if (cursor_visible && cursor_in_viewport) {
-    uint16_t cx, cy;
-    ghostty_render_state_get(
-        render_state, GHOSTTY_RENDER_STATE_DATA_CURSOR_VIEWPORT_X, &cx);
-    ghostty_render_state_get(
-        render_state, GHOSTTY_RENDER_STATE_DATA_CURSOR_VIEWPORT_Y, &cy);
-
-    GhosttyRenderStateCursorVisualStyle style;
-    ghostty_render_state_get(
-        render_state, GHOSTTY_RENDER_STATE_DATA_CURSOR_VISUAL_STYLE,
-        &style);
+  // Read all cursor state in one call.
+  GhosttyRenderStateCursor cursor =
+      GHOSTTY_INIT_SIZED(GhosttyRenderStateCursor);
+  result = ghostty_render_state_get(
+      render_state, GHOSTTY_RENDER_STATE_DATA_CURSOR, &cursor);
+  assert(result == GHOSTTY_SUCCESS);

+  if (cursor.visible && cursor.viewport_has_value) {
    const char* style_name = "unknown";
-    switch (style) {
+    switch (cursor.visual_style) {
      case GHOSTTY_RENDER_STATE_CURSOR_VISUAL_STYLE_BAR:
        style_name = "bar";
        break;
@@ -145,7 +131,8 @@ int main(void) {
        style_name = "hollow";
        break;
    }
-    printf("Cursor at (%u, %u), style: %s\n", cx, cy, style_name);
+    printf("Cursor at (%u, %u), style: %s\n",
+           cursor.viewport_x, cursor.viewport_y, style_name);
  }
  //! [render-cursor]

--- a/include/ghostty/vt/render.h
+++ b/include/ghostty/vt/render.h
@@ -199,6 +199,14 @@ typedef enum GHOSTTY_ENUM_TYPED {
  /** Whether the cursor is on the tail of a wide character (bool).
   *  Only valid when CURSOR_VIEWPORT_HAS_VALUE is true. */
  GHOSTTY_RENDER_STATE_DATA_CURSOR_VIEWPORT_WIDE_TAIL = 17,
+
+  /** All cursor state in one sized struct (GhosttyRenderStateCursor).
+   *  Initialize the output with GHOSTTY_INIT_SIZED before querying. */
+  GHOSTTY_RENDER_STATE_DATA_CURSOR = 18,
+
+  /** All render-state colors in one sized struct (GhosttyRenderStateColors).
+   *  Initialize the output with GHOSTTY_INIT_SIZED before querying. */
+  GHOSTTY_RENDER_STATE_DATA_COLORS = 19,
  GHOSTTY_RENDER_STATE_DATA_MAX_VALUE = GHOSTTY_ENUM_MAX_VALUE,
 } GhosttyRenderStateData;

@@ -286,17 +294,59 @@ typedef struct {
  uint16_t end_x;
 } GhosttyRenderStateRowSelection;

+/**
+ * Render-state cursor information.
+ *
+ * This struct uses the sized-struct ABI pattern. Initialize with
+ * GHOSTTY_INIT_SIZED(GhosttyRenderStateCursor) before querying
+ * GHOSTTY_RENDER_STATE_DATA_CURSOR.
+ *
+ * When viewport_has_value is false, viewport_x, viewport_y, and wide_tail
+ * contain undefined data and must not be read.
+ *
+ * @ingroup render
+ */
+typedef struct {
+  /** Size of this struct in bytes. Must be set to sizeof(GhosttyRenderStateCursor). */
+  size_t size;
+
+  /** Whether the cursor is visible within the viewport. */
+  bool viewport_has_value;
+
+  /** Cursor viewport x position in cells. */
+  uint16_t viewport_x;
+
+  /** Cursor viewport y position in cells. */
+  uint16_t viewport_y;
+
+  /** Whether the cursor is on the tail of a wide character. */
+  bool wide_tail;
+
+  /** Whether the cursor is visible based on terminal modes. */
+  bool visible;
+
+  /** Whether the cursor should blink based on terminal modes. */
+  bool blinking;
+
+  /** Whether the cursor is at a password input field. */
+  bool password_input;
+
+  /** The visual style of the cursor. */
+  GhosttyRenderStateCursorVisualStyle visual_style;
+} GhosttyRenderStateCursor;
+
 /**
 * Render-state color information.
 *
 * This struct uses the sized-struct ABI pattern. Initialize with
- * GHOSTTY_INIT_SIZED(GhosttyRenderStateColors) before calling
- * ghostty_render_state_colors_get().
+ * GHOSTTY_INIT_SIZED(GhosttyRenderStateColors) before querying
+ * GHOSTTY_RENDER_STATE_DATA_COLORS.
 *
 * Example:
 * @code
 * GhosttyRenderStateColors colors = GHOSTTY_INIT_SIZED(GhosttyRenderStateColors);
- * GhosttyResult result = ghostty_render_state_colors_get(state, &colors);
+ * GhosttyResult result = ghostty_render_state_get(
+ *     state, GHOSTTY_RENDER_STATE_DATA_COLORS, &colors);
 * @endcode
 *
 * @ingroup render
@@ -430,8 +480,9 @@ GHOSTTY_API GhosttyResult ghostty_render_state_end_update(GhosttyRenderState sta
 * @param state The render state handle (NULL returns GHOSTTY_INVALID_VALUE)
 * @param data The data kind to query
 * @param[out] out Pointer to receive the queried value
- * @return GHOSTTY_SUCCESS on success, GHOSTTY_INVALID_VALUE if `state` is
- *         NULL or `data` is not a recognized enum value
+ * @return GHOSTTY_SUCCESS on success, GHOSTTY_INVALID_VALUE if `state` or
+ *         `out` is NULL, `data` is not a recognized enum value, or a sized
+ *         output struct is smaller than `sizeof(size_t)`
 *
 * @ingroup render
 */
@@ -486,24 +537,6 @@ GHOSTTY_API GhosttyResult ghostty_render_state_set(GhosttyRenderState state,
                                       GhosttyRenderStateOption option,
                                       const void* value);

-/**
- * Get the current color information from a render state.
- *
- * This writes as many fields as fit in the caller-provided sized struct.
- * `out_colors->size` must be set by the caller (typically via
- * GHOSTTY_INIT_SIZED(GhosttyRenderStateColors)).
- *
- * @param state The render state handle (NULL returns GHOSTTY_INVALID_VALUE)
- * @param[out] out_colors Sized output struct to receive render-state colors
- * @return GHOSTTY_SUCCESS on success, GHOSTTY_INVALID_VALUE if `state` or
- *         `out_colors` is NULL, or if `out_colors->size` is smaller than
- *         `sizeof(size_t)`
- *
- * @ingroup render
- */
-GHOSTTY_API GhosttyResult ghostty_render_state_colors_get(GhosttyRenderState state,
-                                              GhosttyRenderStateColors* out_colors);
-
 /**
 * Create a new row iterator instance.
 *
--- a/src/lib_vt.zig
+++ b/src/lib_vt.zig
@@ -286,7 +286,6 @@ comptime {
            @export(&c.render_state_get, .{ .name = "ghostty_render_state_get" });
            @export(&c.render_state_get_multi, .{ .name = "ghostty_render_state_get_multi" });
            @export(&c.render_state_set, .{ .name = "ghostty_render_state_set" });
-            @export(&c.render_state_colors_get, .{ .name = "ghostty_render_state_colors_get" });
            @export(&c.render_state_row_iterator_new, .{ .name = "ghostty_render_state_row_iterator_new" });
            @export(&c.render_state_row_iterator_next, .{ .name = "ghostty_render_state_row_iterator_next" });
            @export(&c.render_state_row_get, .{ .name = "ghostty_render_state_row_get" });
--- a/src/terminal/c/main.zig
+++ b/src/terminal/c/main.zig
@@ -90,7 +90,6 @@ pub const render_state_end_update = render.end_update;
 pub const render_state_get = render.get;
 pub const render_state_get_multi = render.get_multi;
 pub const render_state_set = render.set;
-pub const render_state_colors_get = render.colors_get;
 pub const render_state_row_iterator_new = render.row_iterator_new;
 pub const render_state_row_iterator_next = render.row_iterator_next;
 pub const render_state_row_get = render.row_get;
--- a/src/terminal/c/render.zig
+++ b/src/terminal/c/render.zig
@@ -100,6 +100,19 @@ pub const CursorVisualStyle = enum(c_int) {
    }
 };

+/// C: GhosttyRenderStateCursor
+pub const Cursor = extern struct {
+    size: usize = @sizeOf(Cursor),
+    viewport_has_value: bool,
+    viewport_x: u16,
+    viewport_y: u16,
+    wide_tail: bool,
+    visible: bool,
+    blinking: bool,
+    password_input: bool,
+    visual_style: CursorVisualStyle,
+};
+
 /// C: GhosttyRenderStateData
 pub const Data = enum(c_int) {
    invalid = 0,
@@ -120,6 +133,8 @@ pub const Data = enum(c_int) {
    cursor_viewport_x = 15,
    cursor_viewport_y = 16,
    cursor_viewport_wide_tail = 17,
+    cursor = 18,
+    colors = 19,

    /// Output type expected for querying the data of the given kind.
    pub fn OutType(comptime self: Data) type {
@@ -135,6 +150,8 @@ pub const Data = enum(c_int) {
            .cursor_visible, .cursor_blinking, .cursor_password_input => bool,
            .cursor_viewport_has_value, .cursor_viewport_wide_tail => bool,
            .cursor_viewport_x, .cursor_viewport_y => size.CellCountInt,
+            .cursor => Cursor,
+            .colors => Colors,
        };
    }
 };
@@ -270,12 +287,13 @@ inline fn getDispatch(
        };
    }

+    const out_ptr = out orelse return .invalid_value;
    return switch (data) {
        .invalid => .invalid_value,
        inline else => |comptime_data| getTyped(
            state,
            comptime_data,
-            @ptrCast(@alignCast(out)),
+            @ptrCast(@alignCast(out_ptr)),
        ),
    };
 }
@@ -328,6 +346,8 @@ fn getTyped(
            const vp = state.state.cursor.viewport orelse return .invalid_value;
            out.* = vp.wide_tail;
        },
+        .cursor => return writeCursor(state, out),
+        .colors => return writeColors(state, out),
    }

    return .success;
@@ -367,12 +387,87 @@ fn setTyped(
    return .success;
 }

-pub fn colors_get(
-    state_: RenderState,
-    out_colors_: ?*Colors,
-) callconv(lib.calling_conv) Result {
-    const state = state_ orelse return .invalid_value;
-    const out_colors = out_colors_ orelse return .invalid_value;
+fn writeCursor(
+    state: *RenderStateWrapper,
+    out_cursor: *Cursor,
+) Result {
+    const out_size = out_cursor.size;
+    if (out_size < @sizeOf(usize)) return .invalid_value;
+
+    const cursor = &state.state.cursor;
+    if (lib.structSizedFieldFits(
+        Cursor,
+        out_size,
+        "viewport_has_value",
+    )) {
+        out_cursor.viewport_has_value = cursor.viewport != null;
+    }
+
+    if (cursor.viewport) |viewport| {
+        if (lib.structSizedFieldFits(
+            Cursor,
+            out_size,
+            "viewport_x",
+        )) {
+            out_cursor.viewport_x = viewport.x;
+        }
+
+        if (lib.structSizedFieldFits(
+            Cursor,
+            out_size,
+            "viewport_y",
+        )) {
+            out_cursor.viewport_y = viewport.y;
+        }
+
+        if (lib.structSizedFieldFits(
+            Cursor,
+            out_size,
+            "wide_tail",
+        )) {
+            out_cursor.wide_tail = viewport.wide_tail;
+        }
+    }
+
+    if (lib.structSizedFieldFits(
+        Cursor,
+        out_size,
+        "visible",
+    )) {
+        out_cursor.visible = cursor.visible;
+    }
+
+    if (lib.structSizedFieldFits(
+        Cursor,
+        out_size,
+        "blinking",
+    )) {
+        out_cursor.blinking = cursor.blinking;
+    }
+
+    if (lib.structSizedFieldFits(
+        Cursor,
+        out_size,
+        "password_input",
+    )) {
+        out_cursor.password_input = cursor.password_input;
+    }
+
+    if (lib.structSizedFieldFits(
+        Cursor,
+        out_size,
+        "visual_style",
+    )) {
+        out_cursor.visual_style = CursorVisualStyle.fromCursorStyle(cursor.visual_style);
+    }
+
+    return .success;
+}
+
+fn writeColors(
+    state: *RenderStateWrapper,
+    out_colors: *Colors,
+) Result {
    const out_size = out_colors.size;
    if (out_size < @sizeOf(usize)) return .invalid_value;

@@ -997,6 +1092,14 @@ test "render: begin/end update" {
 test "render: get invalid value" {
    var cols: size.CellCountInt = 0;
    try testing.expectEqual(Result.invalid_value, get(null, .cols, @ptrCast(&cols)));
+
+    var state: RenderState = null;
+    try testing.expectEqual(Result.success, new(
+        &lib.alloc.test_allocator,
+        &state,
+    ));
+    defer free(state);
+    try testing.expectEqual(Result.invalid_value, get(state, .cols, null));
 }

 test "render: get invalid data" {
@@ -1010,7 +1113,7 @@ test "render: get invalid data" {
    try testing.expectEqual(Result.invalid_value, get(state, .invalid, null));
 }

-test "render: colors get invalid value" {
+test "render: aggregate get invalid value" {
    var state: RenderState = null;
    try testing.expectEqual(Result.success, new(
        &lib.alloc.test_allocator,
@@ -1021,11 +1124,20 @@ test "render: colors get invalid value" {
    var colors: Colors = std.mem.zeroes(Colors);
    colors.size = @sizeOf(Colors);

-    try testing.expectEqual(Result.invalid_value, colors_get(null, &colors));
-    try testing.expectEqual(Result.invalid_value, colors_get(state, null));
+    try testing.expectEqual(Result.invalid_value, get(null, .colors, &colors));
+    try testing.expectEqual(Result.invalid_value, get(state, .colors, null));

    colors.size = @sizeOf(usize) - 1;
-    try testing.expectEqual(Result.invalid_value, colors_get(state, &colors));
+    try testing.expectEqual(Result.invalid_value, get(state, .colors, &colors));
+
+    var cursor: Cursor = std.mem.zeroes(Cursor);
+    cursor.size = @sizeOf(Cursor);
+
+    try testing.expectEqual(Result.invalid_value, get(null, .cursor, &cursor));
+    try testing.expectEqual(Result.invalid_value, get(state, .cursor, null));
+
+    cursor.size = @sizeOf(usize) - 1;
+    try testing.expectEqual(Result.invalid_value, get(state, .cursor, &cursor));
 }

 test "render: get/set dirty invalid value" {
@@ -1738,7 +1850,7 @@ test "render: update" {
    try testing.expectEqual(@as(size.CellCountInt, 24), rows_val);
 }

-test "render: colors get" {
+test "render: colors data get" {
    var terminal: terminal_c.Terminal = null;
    try testing.expectEqual(Result.success, terminal_c.new(
        &lib.alloc.test_allocator,
@@ -1759,7 +1871,7 @@ test "render: colors get" {

    var colors: Colors = std.mem.zeroes(Colors);
    colors.size = @sizeOf(Colors);
-    try testing.expectEqual(Result.success, colors_get(state, &colors));
+    try testing.expectEqual(Result.success, get(state, .colors, &colors));

    const state_colors = &state.?.state.colors;
    try testing.expectEqual(state_colors.background.cval(), colors.background);
@@ -1777,6 +1889,121 @@ test "render: colors get" {
    }
 }

+test "render: cursor data get matches scalar getters" {
+    var terminal: terminal_c.Terminal = null;
+    try testing.expectEqual(Result.success, terminal_c.new(
+        &lib.alloc.test_allocator,
+        &terminal,
+        80,
+        24,
+    ));
+    defer terminal_c.free(terminal);
+
+    var state: RenderState = null;
+    try testing.expectEqual(Result.success, new(
+        &lib.alloc.test_allocator,
+        &state,
+    ));
+    defer free(state);
+
+    try testing.expectEqual(Result.success, update(state, terminal));
+
+    var cursor: Cursor = std.mem.zeroes(Cursor);
+    cursor.size = @sizeOf(Cursor);
+    try testing.expectEqual(Result.success, get(state, .cursor, &cursor));
+
+    var viewport_has_value: bool = undefined;
+    var viewport_x: u16 = undefined;
+    var viewport_y: u16 = undefined;
+    var wide_tail: bool = undefined;
+    var visible: bool = undefined;
+    var blinking: bool = undefined;
+    var password_input: bool = undefined;
+    var visual_style: CursorVisualStyle = undefined;
+    try testing.expectEqual(Result.success, get(state, .cursor_viewport_has_value, &viewport_has_value));
+    try testing.expectEqual(Result.success, get(state, .cursor_viewport_x, &viewport_x));
+    try testing.expectEqual(Result.success, get(state, .cursor_viewport_y, &viewport_y));
+    try testing.expectEqual(Result.success, get(state, .cursor_viewport_wide_tail, &wide_tail));
+    try testing.expectEqual(Result.success, get(state, .cursor_visible, &visible));
+    try testing.expectEqual(Result.success, get(state, .cursor_blinking, &blinking));
+    try testing.expectEqual(Result.success, get(state, .cursor_password_input, &password_input));
+    try testing.expectEqual(Result.success, get(state, .cursor_visual_style, &visual_style));
+
+    try testing.expectEqual(viewport_has_value, cursor.viewport_has_value);
+    try testing.expectEqual(viewport_x, cursor.viewport_x);
+    try testing.expectEqual(viewport_y, cursor.viewport_y);
+    try testing.expectEqual(wide_tail, cursor.wide_tail);
+    try testing.expectEqual(visible, cursor.visible);
+    try testing.expectEqual(blinking, cursor.blinking);
+    try testing.expectEqual(password_input, cursor.password_input);
+    try testing.expectEqual(visual_style, cursor.visual_style);
+}
+
+test "render: cursor data get without viewport" {
+    var state: RenderState = null;
+    try testing.expectEqual(Result.success, new(
+        &lib.alloc.test_allocator,
+        &state,
+    ));
+    defer free(state);
+
+    state.?.state.cursor.viewport = null;
+    state.?.state.cursor.visible = true;
+    state.?.state.cursor.blinking = true;
+    state.?.state.cursor.password_input = true;
+    state.?.state.cursor.visual_style = .underline;
+
+    var cursor: Cursor = std.mem.zeroes(Cursor);
+    cursor.size = @sizeOf(Cursor);
+    cursor.viewport_x = 0xAAAA;
+    cursor.viewport_y = 0xBBBB;
+    cursor.wide_tail = true;
+    try testing.expectEqual(Result.success, get(state, .cursor, &cursor));
+
+    try testing.expect(!cursor.viewport_has_value);
+    try testing.expectEqual(@as(u16, 0xAAAA), cursor.viewport_x);
+    try testing.expectEqual(@as(u16, 0xBBBB), cursor.viewport_y);
+    try testing.expect(cursor.wide_tail);
+    try testing.expect(cursor.visible);
+    try testing.expect(cursor.blinking);
+    try testing.expect(cursor.password_input);
+    try testing.expectEqual(CursorVisualStyle.underline, cursor.visual_style);
+}
+
+test "render: cursor data get supports truncated sized struct" {
+    var terminal: terminal_c.Terminal = null;
+    try testing.expectEqual(Result.success, terminal_c.new(
+        &lib.alloc.test_allocator,
+        &terminal,
+        80,
+        24,
+    ));
+    defer terminal_c.free(terminal);
+
+    var state: RenderState = null;
+    try testing.expectEqual(Result.success, new(
+        &lib.alloc.test_allocator,
+        &state,
+    ));
+    defer free(state);
+
+    try testing.expectEqual(Result.success, update(state, terminal));
+    const expected = state.?.state.cursor;
+    const viewport = expected.viewport.?;
+
+    var cursor: Cursor = std.mem.zeroes(Cursor);
+    cursor.size = @offsetOf(Cursor, "viewport_y") + @sizeOf(u16);
+    cursor.wide_tail = !viewport.wide_tail;
+    cursor.visible = !expected.visible;
+    try testing.expectEqual(Result.success, get(state, .cursor, &cursor));
+
+    try testing.expect(cursor.viewport_has_value);
+    try testing.expectEqual(viewport.x, cursor.viewport_x);
+    try testing.expectEqual(viewport.y, cursor.viewport_y);
+    try testing.expectEqual(!viewport.wide_tail, cursor.wide_tail);
+    try testing.expectEqual(!expected.visible, cursor.visible);
+}
+
 test "render: row cells bg_color no background" {
    var terminal: terminal_c.Terminal = null;
    try testing.expectEqual(Result.success, terminal_c.new(
@@ -2020,7 +2247,7 @@ test "render: row cells fg_color from style" {
    try testing.expectEqual(@as(u8, 30), fg.b);
 }

-test "render: colors get supports truncated sized struct" {
+test "render: colors data get supports truncated sized struct" {
    var terminal: terminal_c.Terminal = null;
    try testing.expectEqual(Result.success, terminal_c.new(
        &lib.alloc.test_allocator,
@@ -2044,7 +2271,7 @@ test "render: colors get supports truncated sized struct" {
    for (&colors.palette) |*entry| entry.* = sentinel;

    colors.size = @offsetOf(Colors, "palette") + @sizeOf(colorpkg.RGB.C) * 2;
-    try testing.expectEqual(Result.success, colors_get(state, &colors));
+    try testing.expectEqual(Result.success, get(state, .colors, &colors));

    const state_colors = &state.?.state.colors;
    try testing.expectEqual(state_colors.palette[0].cval(), colors.palette[0]);
--- a/src/terminal/c/types.zig
+++ b/src/terminal/c/types.zig
@@ -70,6 +70,7 @@ pub const structs: std.StaticStringMap(StructInfo) = structs: {
        .{ "GhosttyPointCoordinate", StructInfo.init(point.Coordinate) },
        .{ "GhosttyReader", StructInfo.init(io.Reader) },
        .{ "GhosttyRenderStateColors", StructInfo.init(render.Colors) },
+        .{ "GhosttyRenderStateCursor", StructInfo.init(render.Cursor) },
        .{ "GhosttyRenderStateRowSelection", StructInfo.init(render.RowSelection) },
        .{ "GhosttySelectionGestureBehaviors", StructInfo.init(selection_gesture.Behaviors) },
        .{ "GhosttySelectionGestureGeometry", StructInfo.init(selection_gesture.Geometry) },
@@ -257,6 +258,7 @@ test "json parses" {
        "GhosttyPointCoordinate",
        "GhosttyReader",
        "GhosttyRenderStateColors",
+        "GhosttyRenderStateCursor",
        "GhosttyRenderStateRowSelection",
        "GhosttySelection",
        "GhosttySelectionGestureBehaviors",
@@ -309,6 +311,18 @@ test "json parses" {
    try std.testing.expect(unknown_string_fields.contains("truncated"));
    try std.testing.expect(unknown_string_fields.contains("content"));

+    const render_cursor_fields = root.get("GhosttyRenderStateCursor").?.object
+        .get("fields").?.object;
+    try std.testing.expect(render_cursor_fields.contains("size"));
+    try std.testing.expect(render_cursor_fields.contains("viewport_has_value"));
+    try std.testing.expect(render_cursor_fields.contains("viewport_x"));
+    try std.testing.expect(render_cursor_fields.contains("viewport_y"));
+    try std.testing.expect(render_cursor_fields.contains("wide_tail"));
+    try std.testing.expect(render_cursor_fields.contains("visible"));
+    try std.testing.expect(render_cursor_fields.contains("blinking"));
+    try std.testing.expect(render_cursor_fields.contains("password_input"));
+    try std.testing.expect(render_cursor_fields.contains("visual_style"));
+
    const reader_fields = root.get("GhosttyReader").?.object
        .get("fields").?.object;
    try std.testing.expect(reader_fields.contains("read"));