RemoteCompose Protocol Specification

This document defines some of the binary protocol format for RemoteCompose. Each operation consists of an OpCode followed by its specific data fields. This is not authoritative but is provided to give a feel for the protocol.

OpCode Reference

OpCode	Name	Purpose	Fields
0	HEADER	Document metadata	Version, Width, Height, Density, Profiles
38	CLIP_PATH	Set clip path	Path ID
39	CLIP_RECT	Set clip rectangle	L, T, R, B
40	PAINT_VALUES	Update paint state	Serialized PaintBundle
42	DRAW_RECT	Draw rectangle	L, T, R, B
43	DRAW_TEXT_RUN	Draw text run	Text ID, start, end, x, y, RTL
44	DRAW_BITMAP	Draw image	Bitmap ID, L, T, R, B
46	DRAW_CIRCLE	Draw circle	cx, cy, radius
47	DRAW_LINE	Draw line	x1, y1, x2, y2
51	DRAW_ROUND_RECT	Draw rounded rect	L, T, R, B, rx, ry
52	DRAW_SECTOR	Draw pie slice	L, T, R, B, start, sweep
53	DRAW_TEXT_ON_PATH	Text along path	Text ID, Path ID, hOffset, vOffset
63	THEME	Set active theme	Theme ID (Light/Dark/Any)
80	DATA_FLOAT	Define constant	Float ID, value
81	ANIMATED_FLOAT	Dynamic expression	Float ID, RPN operations
101	DATA_BITMAP	Serialized image	Bitmap ID, width, height, pixels
102	DATA_TEXT	Serialized string	Text ID, string content
123	DATA_PATH	Serialized path	Path ID, points/commands
124	DRAW_PATH	Draw vector path	Path ID
126-129	MATRIX_*	Transformations	Scale, Translate, Skew, Rotate
130-131	MATRIX_SAVE/RESTORE	Pushes/Pops matrix	-
133	DRAW_TEXT_ANCHOR	Aligned text	Text ID, x, y, panX, panY, flags
135	TEXT_FROM_FLOAT	Float to String	Text ID, value ID, formatting
139	DRAW_CONTENT	Component content	Used in Canvas/Draw Content
144	INTEGER_EXPRESSION	Math on Ints	Int ID, mask, operations
157	TOUCH_EXPRESSION	Input mapping	Def, min, max, mode, easing, RPN
161	PARTICLE_DEFINE	Particle system	ID, var IDs, count, init equations
163	PARTICLE_LOOP	Particle update	ID, restart eq, update equations
178	CONDITIONAL_OPS	If block	Condition type, a, b, children...
193	PATH_EXPRESSION	Algorithmic path	Path ID, range, X eq, Y eq
201	COMPONENT_START	UI Node	Component ID, layout type, flags
230	CONTAINER_END	Closes block	-

Data Types

• Int: 32-bit signed (Little Endian).
• Float: 32-bit IEEE 754.
• Short: 16-bit signed.
• Byte: 8-bit unsigned.
• String: UTF-8 encoded, prefixed by length (Int).
• Float ID: Encoded as a NaN where the significand contains the 24-bit ID.