v0.1.26

The rest of the kitty graphics protocol, sixel and iTerm2 images, and a terminal that answers the pixel size queries programs probe with before they send one.

New

• The terminal answers CSI 14 t and CSI 16 t from the cell size Emulator::set_cell_size measured, and every reply leaves in the order its query arrived.
• Kitty placements by id: a=p places a stored image, p names a placement so one image can hold several, and I transmits and names an image by number, echoed in the reply. Every delete carries out its target — a, i, n, c, p, q, x, y, z, r — and an upper-case one frees the data of each image it leaves with no placement.
• Kitty display keys: z layers an image over the text, under it, or under non-default cell backgrounds; x, y, w, h crop the source; X, Y offset it inside its first cell; c or r alone scales by the image's aspect, and both letterbox it.
• Kitty payloads compressed with zlib (o=z), inflated whole and held to the same 64 MiB ceiling as an uncompressed one.
• Kitty Unicode placeholders: a virtual placement (U=1) is shown wherever the text holds U+10EEEE cells naming it, which is the path multiplexers take. kitty::PLACEHOLDER is the character.
• Kitty file, temporary file and shared memory transmission (t=f, t=t, t=s, with O and S), off until a host calls Emulator::set_local_media(true). Paths resolve through symlinks, /proc, /sys and /dev are refused, only regular files are read, and every failure is the one EBADF reply.
• Kitty relative placements (P, Q, H, V), found from their parent each frame and deleted with it, refused with ENOPARENT, ECYCLE, ETOODEEP past a chain of eight, or EINVAL for a virtual one.
• Kitty animation: a=f adds or edits a frame over a blank, colored or earlier canvas, a=a sets the state, current frame, loop count and gaps, a=c composes a rectangle of one frame onto another, and d=f deletes a frame. view::Images plays them and schedules a repaint for when the next frame is due.
• Sixel images, placed at the cursor the way a=T places a kitty image. Emulator::set_advertise_sixel(true) answers DA1 as CSI ? 62 ; 4 ; 22 c for programs that look for sixel there before sending one.
• iTerm2 inline images (OSC 1337 ; File=), sent whole or in parts between MultipartFile and FileEnd, sized in cells, pixels or percent, with preserveAspectRatio. An animated GIF plays.

Changed

• terminal::scanner holds Scanner, Segment and the new Iterm, which were in kitty. Segment reports sixel data, iTerm2 files and CSI 16 t alongside kitty commands and mode 2026.
• Segment, Iterm, kitty::Action, kitty::Target, kitty::Effect, kitty::Command, kitty::Display, kitty::Reply, kitty::Delete, emulator::Placement and view::PlacedImage are #[non_exhaustive].
• kitty::Store::apply answers an Effect — a placement or a delete for the emulator to carry out — rather than a Display, and kitty::Reply is a struct carrying the I and p it echoes. Command::compressed is Command::compression.
• emulator::Placement carries the placement's frame, source and z. view::PlacedImage carries them too, with id, frame_index, next_frame and wake; its image is the one frame to paint.
• A lower-case d=a or d=i takes placements off the screen and keeps the image data, so the image can be placed again; the upper-case form frees it.
• An image of the default z-index paints over the text rather than under it, as the protocol has it.
• New dependencies: miniz_oxide, already in the tree under png, and libc on unix.

Fixed

• Several placements can share one top-left cell; placing a second one there no longer drops the first.
• a=q answers what the same transmission would — a refused medium, an unreadable file, a payload that does not fit its size — and stores nothing.