Move the frame into draw.zig and the transitions out of layout.zig

Pure moves, no behaviour change. draw.zig holds the whole core frame in
order: render, the pane, tag, header and notice painters it calls, and the
character-effect composition (Pardes.render stays a declaration alias).
Presentation.zig is the panel presentation state as a file struct, and
animation.zig the easing curves, transition kinds, tracks and boxes, the
character effects' sources and the generic displayed-value transition, all
of which lived in layout.zig. layout.zig keeps only layout.

1 files changed, 5 insertions, 4 deletions

diff --git a/src/colors.zig b/src/colors.zig
index bb366fc0..f814d55d 100644
--- a/src/colors.zig
+++ b/src/colors.zig
@@ -5,6 +5,7 @@ const tagline = @import("tagline.zig");
 const panes = @import("panes.zig");
 const std = @import("std");
 const layout = @import("layout.zig");
+const animation = @import("animation.zig");
 const Color = @import("surface.zig").Color;
 const FontRole = @import("surface.zig").FontRole;
 const config = @import("config.zig");
@@ -185,15 +186,15 @@ pub const ChromeTheme = struct {
     pub fn interpolate(from: ChromeTheme, to: ChromeTheme, step: u16, steps: u16) ChromeTheme {
         var out: ChromeTheme = undefined;
         inline for (@typeInfo(ChromeTheme).@"struct".fields) |field|
-            @field(out, field.name) = layout.Animation.interpolateRgb(@field(from, field.name), @field(to, field.name), step, steps);
+            @field(out, field.name) = animation.Animation.interpolateRgb(@field(from, field.name), @field(to, field.name), step, steps);
         return out;
     }
 };
 
 pub const ChromeAnimation = if (theme_animation)
-    layout.Animation.Transition(ChromeTheme)
+    animation.Animation.Transition(ChromeTheme)
 else
-    layout.Animation.Immediate(ChromeTheme);
+    animation.Animation.Immediate(ChromeTheme);
 
 pub const initial_chrome = ChromeTheme.fromTheme(&themes[0]);
 
@@ -413,7 +414,7 @@ test "runtime theme changes animate chrome and retarget without a jump" {
     try std.testing.expectEqualStrings("acme", p.theme().name);
     try std.testing.expectEqual(midflight, p.chromeTheme().*);
     try std.testing.expect(p.animationActive());
-    for (0..layout.Animation.transition_steps) |_| p.update(.tick);
+    for (0..animation.Animation.transition_steps) |_| p.update(.tick);
     try std.testing.expect(!p.animationActive());
     try std.testing.expectEqual(ChromeTheme.fromTheme(p.theme()), p.chromeTheme().*);
     // Extra ticks are inert at the exact endpoint.