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libghostty: add kitty graphics image lookup API

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Add a GhosttyKittyGraphicsImage opaque type and API for looking up
images by ID and querying their properties. This complements the
existing placement iterator by allowing direct image introspection.

The new ghostty_kitty_graphics_image() function looks up an image by
its ID from the storage, returning a borrowed opaque handle. Properties
are queried via ghostty_kitty_image_get() using the new
GhosttyKittyGraphicsImageData enum, which exposes id, number, width,
height, format, compression, and a borrowed data pointer with length.

Format and compression are exposed as their own C enum types
(GhosttyKittyImageFormat and GhosttyKittyImageCompression) rather
than raw integers.
This commit is contained in:
Mitchell Hashimoto
2026-04-06 09:24:52 -07:00
parent 9033f6f8ce
commit 46a69ea63d
4 changed files with 319 additions and 0 deletions
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src/lib_vt.zig
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@@ -234,6 +234,8 @@ comptime {
@export(&c.terminal_get, .{ .name = "ghostty_terminal_get" });
@export(&c.terminal_grid_ref, .{ .name = "ghostty_terminal_grid_ref" });
@export(&c.kitty_graphics_get, .{ .name = "ghostty_kitty_graphics_get" });
@export(&c.kitty_graphics_image, .{ .name = "ghostty_kitty_graphics_image" });
@export(&c.kitty_image_get, .{ .name = "ghostty_kitty_image_get" });
@export(&c.kitty_graphics_placement_iterator_new, .{ .name = "ghostty_kitty_graphics_placement_iterator_new" });
@export(&c.kitty_graphics_placement_iterator_free, .{ .name = "ghostty_kitty_graphics_placement_iterator_free" });
@export(&c.kitty_graphics_placement_next, .{ .name = "ghostty_kitty_graphics_placement_next" });