Module headless 

Offscreen rendering, input injection, and resource observations.

Structs

HeadlessConfig

Configuration for a headless renderer session.

HeadlessRenderer

A deterministic, non-interactive Tessera renderer session.

Enums

HeadlessError

Errors produced by headless session setup and the JSONL worker loop.

Constants

HEADLESS_ENV

Environment variable that switches a Tessera application into headless mode.

HEADLESS_FRAME_TIME_MS_ENV

Environment variable overriding the virtual frame step in milliseconds.

HEADLESS_HEIGHT_ENV

Environment variable overriding the initial headless surface height.

HEADLESS_SCALE_FACTOR_ENV

Environment variable overriding physical pixels per density-independent pixel.

HEADLESS_WIDTH_ENV

Environment variable overriding the initial headless surface width.

Functions

encode_png_rgba

Encodes tightly packed RGBA8 pixels as a PNG image.

headless_mode_requested

Returns whether the current process should run in headless mode.

run_headless

Runs the worker side of the cargo tessera headless protocol.

write_png_file

Writes a PNG file containing pixels and returns the byte length written.