A terminal's kitty graphics draw as glyph art where pixels cannot, and by choice: Petscii on the pane, TermImages for new ones

Under an outer terminal without kitty graphics a tty pardes cannot pass a
terminal pane's images on, so it draws them itself as an image pane's
Petscii does: each row of an image is matched to C64-palette glyph art
over the cells it covers (GlyphArt.renderRect, the exact-grid half of
GlyphArt.render), cached while it is on screen. yazi is still told the
kitty protocol works, so it keeps sending its previews.

The same art is a choice anywhere: the Petscii builtin now takes a
terminal pane too (PaneKind.picture), flipping its images between pixels
and glyphs, and a terminal holding images, or drawing them as glyphs by
choice, says petscii:on|off in its tag as an image pane does. TermImages
real|petscii (default real) is what a new terminal starts with; it is in
DumpConfig, /ctl and the reference.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 9 insertions, 2 deletions

diff --git a/src/builtins.zig b/src/builtins.zig
index fb6aa4cf..f51409aa 100644
--- a/src/builtins.zig
+++ b/src/builtins.zig
@@ -43,12 +43,16 @@ pub const PaneKind = enum {
     terminal,
     pdf,
     image,
+    /// An image pane, or a terminal, whose program's kitty graphics are
+    /// pictures too.
+    picture,
 
     pub fn has(kind: PaneKind, pane: *const panes.Pane) bool {
         return switch (kind) {
             .terminal => pane.isTerminal(),
             .pdf => pane.hasPdf(),
             .image => pane.image != null,
+            .picture => pane.image != null or pane.isTerminal(),
         };
     }
 
@@ -57,6 +61,7 @@ pub const PaneKind = enum {
             .terminal => "a terminal",
             .pdf => "a PDF",
             .image => "an image",
+            .picture => "an image or a terminal",
         };
     }
 };
@@ -981,11 +986,13 @@ pub const PdfSections = struct {
     }
 };
 
-/// glyph art over the host's pixels
+/// glyph art over the host's pixels: an image pane's picture, or the
+/// kitty graphics a terminal's program placed (yazi's previews)
 pub const Petscii = struct {
-    pub const needs: PaneKind = .image;
+    pub const needs: PaneKind = .picture;
     pub fn run(c: Ctx) void {
         if (c.pane.image) |*state| panes.Image.toggleGlyphArt(state);
+        panes.terminal.togglePetscii(c.pane);
     }
 };