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ImageTokenEstimator

velesdb_memory::context::estimator

Struct ImageTokenEstimator 

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pub struct ImageTokenEstimator;
Expand description

Header-only image dimension sniff + a single token-cost formula for inline media fragments (US-009, PR1: images only).

This is deliberately not a TokenEstimator impl: it does not take text, it takes a mime and raw decoded bytes, and its cost model has nothing in common with the char-class heuristic. It parses just enough of PNG (the IHDR chunk) and JPEG (the first SOF0/SOF2 marker) to read pixel dimensions — no other chunks/markers, no color data, no CRC verification. The cost formula (ceil(width * height / 750)) is Claude’s published image-token constant; picking one formula at launch is a deliberate simplification — a per-provider cost model is a documented future seam, not built here.

Any mime this module does not recognize, or bytes whose header cannot be read (too short, bad signature, no SOF marker found), fall back to the crate’s default text estimator run over bytes_b64 — the base64 text is always longer than a tight token count would be, so this is a safe over-count, never a silent under-count of a real image’s cost.

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impl ImageTokenEstimator

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pub fn estimate(mime: &str, bytes: &[u8], bytes_b64: &str) -> u64

Estimated prompt-token cost of one image fragment. bytes are the decoded raw media; bytes_b64 is the original base64 text, read only by the fallback path.

Trait Implementations§

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impl Clone for ImageTokenEstimator

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fn clone(&self) -> ImageTokenEstimator

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Copy for ImageTokenEstimator

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impl Debug for ImageTokenEstimator

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for ImageTokenEstimator

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fn default() -> ImageTokenEstimator

Returns the “default value” for a type. Read more

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