Canvas transfer consistency

canvas.transfer-consistency

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// Test source pending.

Definition

Compares direct bitmap transfers with CPU-mediated transfers using owned pixels.

Find it in the repository

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

Execution contract

Signal: canvas.transfer-consistency
Collector: canvas.transfer-consistency
API / surface: core/signals/canvas/transfer-consistency.ts
Timeout: 2250 ms
Companion signals: None
Fixture inputs: Inline owned corpora (listed below)

core/fixtures/canvas/transfer.json · sha256:c903e65d43e7297bcb3b4ec0c11402239450c3f8bf92b8756be2450975da8aac
core/fixtures/canvas/challenges-inputs.ts · sha256:d293dcff5b11f15cbb02d36a50c54e05e39102bd81b370111744f9e703e28a53

Exact request inputs

[
  {
    "key": "canvas.transfer-consistency.responses",
    "inputs": {
      "bytes-direct-first": {
        "source": "bytes",
        "order": "direct-first",
        "dimensions": [
          16,
          16
        ],
        "revision": "transfer-bytes-r1",
        "sha256": "997d7aa23d8f200305bb3316dcab06cfd4d5e6a29bf5eee6a9bdd71766573c56",
        "scene": {
          "background": "rgb(240,230,210)",
          "stops": [
            "#17426a",
            "#e28329"
          ],
          "shadow": "rgba(20,40,60,0.5)",
          "points": [
            [
              1,
              2
            ],
            [
              14,
              4
            ],
            [
              6,
              14
            ]
          ],
          "composite": "multiply",
          "text": "Á",
          "font": "8px serif"
        },
        "requestedAttributes": {
          "colorSpace": "srgb",
          "alpha": false,
          "willReadFrequently": false
        },
        "unpack": {
          "flipY": false,
          "premultiply": false,
          "colorConversion": "NONE"
        },
        "normalization": "first uploaded row is returned first; byte control establishes top-left ordering"
      },
      "bytes-cpu-first": {
        "source": "bytes",
        "order": "cpu-first",
        "dimensions": [
          16,
          16
        ],
        "revision": "transfer-bytes-r1",
        "sha256": "997d7aa23d8f200305bb3316dcab06cfd4d5e6a29bf5eee6a9bdd71766573c56",
        "scene": {
          "background": "rgb(240,230,210)",
          "stops": [
            "#17426a",
            "#e28329"
          ],
          "shadow": "rgba(20,40,60,0.5)",
          "points": [
            [
              1,
              2
            ],
            [
              14,
              4
            ],
            [
              6,
              14
            ]
          ],
          "composite": "multiply",
          "text": "Á",
          "font": "8px serif"
        },
        "requestedAttributes": {
          "colorSpace": "srgb",
          "alpha": false,
          "willReadFrequently": false
        },
        "unpack": {
          "flipY": false,
          "premultiply": false,
          "colorConversion": "NONE"
        },
        "normalization": "first uploaded row is returned first; byte control establishes top-left ordering"
      },
      "geometry-direct-first": {
        "source": "geometry",
        "order": "direct-first",
        "dimensions": [
          16,
          16
        ],
        "revision": "transfer-bytes-r1",
        "sha256": "997d7aa23d8f200305bb3316dcab06cfd4d5e6a29bf5eee6a9bdd71766573c56",
        "scene": {
          "background": "rgb(240,230,210)",
          "stops": [
            "#17426a",
            "#e28329"
          ],
          "shadow": "rgba(20,40,60,0.5)",
          "points": [
            [
              1,
              2
            ],
            [
              14,
              4
            ],
            [
              6,
              14
            ]
          ],
          "composite": "multiply",
          "text": "Á",
          "font": "8px serif"
        },
        "requestedAttributes": {
          "colorSpace": "srgb",
          "alpha": false,
          "willReadFrequently": false
        },
        "unpack": {
          "flipY": false,
          "premultiply": false,
          "colorConversion": "NONE"
        },
        "normalization": "first uploaded row is returned first; byte control establishes top-left ordering"
      },
      "geometry-cpu-first": {
        "source": "geometry",
        "order": "cpu-first",
        "dimensions": [
          16,
          16
        ],
        "revision": "transfer-bytes-r1",
        "sha256": "997d7aa23d8f200305bb3316dcab06cfd4d5e6a29bf5eee6a9bdd71766573c56",
        "scene": {
          "background": "rgb(240,230,210)",
          "stops": [
            "#17426a",
            "#e28329"
          ],
          "shadow": "rgba(20,40,60,0.5)",
          "points": [
            [
              1,
              2
            ],
            [
              14,
              4
            ],
            [
              6,
              14
            ]
          ],
          "composite": "multiply",
          "text": "Á",
          "font": "8px serif"
        },
        "requestedAttributes": {
          "colorSpace": "srgb",
          "alpha": false,
          "willReadFrequently": false
        },
        "unpack": {
          "flipY": false,
          "premultiply": false,
          "colorConversion": "NONE"
        },
        "normalization": "first uploaded row is returned first; byte control establishes top-left ordering"
      },
      "text-direct-first": {
        "source": "text",
        "order": "direct-first",
        "dimensions": [
          16,
          16
        ],
        "revision": "transfer-bytes-r1",
        "sha256": "997d7aa23d8f200305bb3316dcab06cfd4d5e6a29bf5eee6a9bdd71766573c56",
        "scene": {
          "background": "rgb(240,230,210)",
          "stops": [
            "#17426a",
            "#e28329"
          ],
          "shadow": "rgba(20,40,60,0.5)",
          "points": [
            [
              1,
              2
            ],
            [
              14,
              4
            ],
            [
              6,
              14
            ]
          ],
          "composite": "multiply",
          "text": "Á",
          "font": "8px serif"
        },
        "requestedAttributes": {
          "colorSpace": "srgb",
          "alpha": false,
          "willReadFrequently": false
        },
        "unpack": {
          "flipY": false,
          "premultiply": false,
          "colorConversion": "NONE"
        },
        "normalization": "first uploaded row is returned first; byte control establishes top-left ordering"
      },
      "text-cpu-first": {
        "source": "text",
        "order": "cpu-first",
        "dimensions": [
          16,
          16
        ],
        "revision": "transfer-bytes-r1",
        "sha256": "997d7aa23d8f200305bb3316dcab06cfd4d5e6a29bf5eee6a9bdd71766573c56",
        "scene": {
          "background": "rgb(240,230,210)",
          "stops": [
            "#17426a",
            "#e28329"
          ],
          "shadow": "rgba(20,40,60,0.5)",
          "points": [
            [
              1,
              2
            ],
            [
              14,
              4
            ],
            [
              6,
              14
            ]
          ],
          "composite": "multiply",
          "text": "Á",
          "font": "8px serif"
        },
        "requestedAttributes": {
          "colorSpace": "srgb",
          "alpha": false,
          "willReadFrequently": false
        },
        "unpack": {
          "flipY": false,
          "premultiply": false,
          "colorConversion": "NONE"
        },
        "normalization": "first uploaded row is returned first; byte control establishes top-left ordering"
      }
    },
    "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/canvas.transfer-consistency. 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/canvas/transfer-consistency"

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