From 31fece62f56aa2311e2325de83659edbc9e641db Mon Sep 17 00:00:00 2001
From: Gabriel Schneider <gbrls@0x4200.cafe>
Date: Mon, 17 Aug 2026 16:12:56 -0300
Subject: animation: core publishes transition records; gui evaluates via
 shaders, tty over grid cells

---
 src/macos.zig | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

(limited to 'src/macos.zig')

diff --git a/src/macos.zig b/src/macos.zig
index 9f971e5f..3c1458a3 100644
--- a/src/macos.zig
+++ b/src/macos.zig
@@ -498,7 +498,7 @@ const State = struct {
     arena: std.heap.ArenaAllocator,
     runtime: Runtime,
     cells: []Cell = &.{},
-    /// Frozen canonical grid paired with `changed_cells` while a content or
+    /// Frozen canonical grid paired with an encoded change mask while a content or
     /// lifecycle transition is active. Both are encoded at frame time so the
     /// native renderer never borrows core-owned Cell layout across the ABI.
     previous_cells: []Cell = &.{},
@@ -1397,13 +1397,13 @@ fn collectPanelDiff(st: *State, surface: *const pardes.Surface, count: usize) vo
     }
     for (surface.previous_cells, st.previous_cells[0..count]) |cell, *out|
         out.* = encodeCell(cell);
-    for (surface.changed_cells, st.changed_cells[0..count]) |changed, *out|
-        out.* = encodeChanged(changed);
+    for (surface.cell_diffs, st.changed_cells[0..count]) |diff, *out|
+        out.* = encodeChanged(diff);
     st.panel_diff_len = count;
 }
 
-fn encodeChanged(changed: u8) u8 {
-    return if (changed == 0) 0 else 255;
+fn encodeChanged(diff: pardes.PanelCellDiff) u8 {
+    return if (diff.changed()) 255 else 0;
 }
 
 /// Flatten Surface.images into the flat C array the host walks.
@@ -2089,8 +2089,6 @@ test "pardes.h matches the Zig boundary" {
     inline for (@typeInfo(PanelTrack).@"struct".fields) |field| {
         const c_name = comptime if (std.mem.eql(u8, field.name, "_padding"))
             "reserved0"
-        else if (std.mem.eql(u8, field.name, "_frame_padding"))
-            "reserved1"
         else
             field.name;
         try expectEqual(@offsetOf(c.pardes_panel_track_s, c_name), @offsetOf(PanelTrack, field.name));
@@ -2217,9 +2215,9 @@ test "mac panel ABI paint order includes closing tombstones after live panes" {
 }
 
 test "mac panel mask is a literal normalized grayscale texture" {
-    try std.testing.expectEqual(@as(u8, 0), encodeChanged(0));
-    try std.testing.expectEqual(@as(u8, 255), encodeChanged(1));
-    try std.testing.expectEqual(@as(u8, 255), encodeChanged(255));
+    try std.testing.expectEqual(@as(u8, 0), encodeChanged(.unchanged));
+    try std.testing.expectEqual(@as(u8, 255), encodeChanged(.visual));
+    try std.testing.expectEqual(@as(u8, 255), encodeChanged(.{ .ascii = .{ .from = 'a', .to = 'z' } }));
 }
 
 test "mac panel ABI has the documented compact byte layout" {
@@ -2231,7 +2229,7 @@ test "mac panel ABI has the documented compact byte layout" {
     try std.testing.expectEqual(@as(usize, 6), @offsetOf(PanelTrack, "effect"));
     try std.testing.expectEqual(@as(usize, 7), @offsetOf(PanelTrack, "_padding"));
     try std.testing.expectEqual(@as(usize, 8), @offsetOf(PanelTrack, "frame"));
-    try std.testing.expectEqual(@as(usize, 10), @offsetOf(PanelTrack, "_frame_padding"));
+    try std.testing.expectEqual(@as(usize, 10), @offsetOf(PanelTrack, "frame_count"));
     try std.testing.expectEqual(@as(usize, 12), @offsetOf(PanelTrack, "from"));
     try std.testing.expectEqual(@as(usize, 28), @offsetOf(PanelTrack, "to"));
 }
-- 
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