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, 4 insertions, 3 deletions

diff --git a/src/surface.zig b/src/surface.zig
index a9e69cca..eef787b4 100644
--- a/src/surface.zig
+++ b/src/surface.zig
@@ -3,6 +3,7 @@
 const pardes = @import("pardes.zig");
 const std = @import("std");
 const layout = @import("layout.zig");
+const animation = @import("animation.zig");
 const uucode = @import("uucode");
 const vaxis = @import("vaxis");
 const panes = @import("panes.zig");
@@ -70,7 +71,7 @@ pub const AsciiDiff = struct {
 
     /// Long printable-byte walks complete in about the same time as the other
     /// panel effects. Extra distance is crossed by eased character skips.
-    pub const max_movement_frames = layout.ascii_max_movement_frames;
+    pub const max_movement_frames = animation.ascii_max_movement_frames;
 
     pub fn between(old: *const Cell, new: *const Cell) ?AsciiDiff {
         const from = old.printableAscii() orelse return null;
@@ -341,7 +342,7 @@ pub const Surface = struct {
     cursor: ?struct { x: u16, y: u16, bar: bool = false } = null,
     images: []?ImagePlace = &.{},
     nimages: usize = 0,
-    panel_tracks: [MAX_PANES * 2]layout.Track = undefined,
+    panel_tracks: [MAX_PANES * 2]animation.Track = undefined,
     npanel_tracks: usize = 0,
     previous_cells: []const Cell = &.{},
     previous_body_layers: []const BodyLayer = &.{},
@@ -356,7 +357,7 @@ pub const Surface = struct {
         return &s.body_layers;
     }
 
-    pub fn panelTracks(s: *const Surface) []const layout.Track {
+    pub fn panelTracks(s: *const Surface) []const animation.Track {
         return s.panel_tracks[0..s.npanel_tracks];
     }