Image decoding

media.image-decoding

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// Test source pending.

Definition

Exercises owned image fixtures through ImageDecoder and bitmap paths.

Find it in the repository

Collector source: core/signals/video/image-decoding.ts
Export: measurementModule · Signal object
Field definitions: core/definitions/media/image-decoding.ts
Capture membership: Product capture · common/capture/product.ts
Page registration: app/signals/registry.ts
Field projection: core/results/measurement.ts

Execution contract

Signal: media.image-decoding
Collector: media.image-decoding
API / surface: core/signals/video/image-decoding.ts
Timeout: 2750 ms
Companion signals: None
Fixture inputs: Inline owned corpora (listed below)

core/fixtures/image/corpus.json · sha256:23428abec1ea6ae7ba6d3310e25e9748600021f5dde425fc04132edb4f801fc0

Exact request inputs

[
  {
    "key": "media.image-decoding.responses",
    "inputs": {
      "opaque": {
        "id": "opaque",
        "fixture": "opaque",
        "mode": "decoder",
        "options": {},
        "frameIndex": 0
      },
      "alpha": {
        "id": "alpha",
        "fixture": "alpha",
        "mode": "decoder",
        "options": {},
        "frameIndex": 0
      },
      "tagged": {
        "id": "tagged",
        "fixture": "tagged",
        "mode": "decoder",
        "options": {},
        "frameIndex": 0
      },
      "oriented": {
        "id": "oriented",
        "fixture": "oriented",
        "mode": "decoder",
        "options": {},
        "frameIndex": 0
      },
      "animated": {
        "id": "animated",
        "fixture": "animated",
        "mode": "decoder",
        "options": {},
        "frameIndex": 0
      },
      "avif": {
        "id": "avif",
        "fixture": "avif",
        "mode": "decoder",
        "options": {},
        "frameIndex": 0
      },
      "opaque-half": {
        "id": "opaque-half",
        "fixture": "opaque",
        "mode": "decoder",
        "options": {
          "desiredWidth": 8,
          "desiredHeight": 4
        },
        "frameIndex": 0
      },
      "tagged-none": {
        "id": "tagged-none",
        "fixture": "tagged",
        "mode": "decoder",
        "options": {
          "colorSpaceConversion": "none"
        },
        "frameIndex": 0
      },
      "animated-preference": {
        "id": "animated-preference",
        "fixture": "animated",
        "mode": "decoder",
        "options": {
          "preferAnimation": true
        },
        "frameIndex": 1
      },
      "bitmap-opaque": {
        "id": "bitmap-opaque",
        "fixture": "opaque",
        "mode": "bitmap",
        "options": {},
        "frameIndex": 0
      },
      "bitmap-oriented": {
        "id": "bitmap-oriented",
        "fixture": "oriented",
        "mode": "bitmap",
        "options": {},
        "frameIndex": 0
      },
      "invalid": {
        "id": "invalid",
        "fixture": "invalid",
        "mode": "decoder",
        "options": {},
        "frameIndex": 0
      }
    },
    "controls": {}
  }
]

One collector runs per invocation. Results and JSON select this signal’s fields; any companions execute in the same collector.

Generated source manifest lists runtime files, fixture URLs and content digests for this build. The Source tab provides a copyable console sample.

Run and edit locally

From the repository root, start the Astro app, then open /signals/media.image-decoding. Edit the collector source and reload the page to load its new build.

pnpm run dev:web

In a browser module served by this repository’s Vite graph:

import { createCollector } from "/core/collect"
import { measurementModule } from "/core/signals/video/image-decoding"

const signal = measurementModule
const collector = createCollector()
const suite = { signals: [signal] }
const result = await collector.collect(suite)

Reuse the collector owner for repeated calls so collection can enforce cleanup. This returns the collector’s raw result; app/signals/projection.ts selects the retained fields shown on this page.

rg -n 'measurementModule' core app tests
pnpm run check
pnpm run test tests/unit/app/focused-projection.test.ts