BBS:      TELESC.NET.BR
Assunto:  xtrn/synchess/images/piece_mask.pbmxtrn/synchess/synchess.js
De:       Deuc¨
Data:     Sat, 21 Mar 2026 13:02:22 -0700
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https://gitlab.synchro.net/main/sbbs/-/commit/2925e44447e1ccb7e6b96a5e
Added Files:
	xtrn/synchess/images/piece_mask.pbm
Modified Files:
	xtrn/synchess/synchess.js
Log Message:
SynChess: add piece slide animation for all moves

AI moves flash the source square twice before sliding to draw
attention.  Player moves slide immediately (board is redrawn first
to clear drag highlights).  Castling animates both king and rook.

JXL mode uses flicker-free pixel animation with the two-mask trick
from syncterm-bounce.js: each frame draws the piece silhouette at
the new position, then erases the trail with an inverted mask that
has a hole preserving the piece just drawn.  Both paste commands
are emitted in a single console.write() for atomic rendering.

ANSI fallback steps the piece character along the path with
ease-in-out timing, restoring board squares as it goes.

New file: piece_mask.pbm  136x960 PBM containing draw masks
(piece silhouettes) and erase masks (inverted silhouettes with
48px border) for all 6 piece types.

Co-Authored-By: Claude Opus 4.6 (1M context) 
n
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  mSynchronetn  hgVertrauen n hHome of Synchronet n gh[vert/cvs/bbs].synchro.net

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