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Moving pictures: Kitty animation frames - #46
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A TerminalPicture can be made from TerminalPictureFrames, each a whole frame with its duration. Kitty is sent the later frames after the image (a=f,X=1,z=<ms>), the first frame's gap, and a looping start (a=a,s=3,v=1). Every other method draws the first frame, which is the picture's Rgba. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01448U5MvpKkRkBjwzkkpPFP
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Before: a host could give a terminal one still picture. An animated GIF reached Kitty as its first frame only.
After: a
TerminalPicturecan be built fromTerminalPictureFrames, each a whole frame plus how long it shows. Kitty gets the image as before, then each later frame (a=f,X=1,z=<ms>), the first frame's duration (a=a,r=1,z=), and a start that loops forever (a=a,s=3,v=1). From then on the terminal plays it with nothing more sent. iTerm2, sixel and half blocks draw the first frame, which is stillRgba.How:
EncodeKittywrites the image and its frames as one cached transmission per size, so other connections get a copy, the same as before. A frame list of one counts as a still picture. The tests cover the frame and control sequences, the first frame where the terminal can't animate, and frame size validation.Not checked in a real terminal: whether kitty animates an image shown only through Unicode placeholders (virtual placement). The protocol ties an animation to the image, not to a placement, so it should.
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https://claude.ai/code/session_01448U5MvpKkRkBjwzkkpPFP
Generated by Claude Code