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Queue a global task to resolve promises #106

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Merged
reillyeon merged 2 commits into from
Jan 8, 2025
Merged

Queue a global task to resolve promises #106

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Queue a global task to resolve promises
reillyeon Jan 7, 2025
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Merge branch 'main' into queue_resolve_task
reillyeon Jan 8, 2025
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6 changes: 4 additions & 2 deletions index.bs
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Expand Up @@ -49,6 +49,8 @@ Please see the <a href="https://github.com/WICG/shape-detection-api/blob/master/

Individual browsers MAY provide Detectors indicating the availability of hardware providing accelerated operation.

Detecting features in an image occurs asynchronously, potentially communicating with acceleration hardware independent of the browser. Completion events use the <dfn>shape detection task source</dfn>.

## Image sources for detection ## {#image-sources-for-detection}

<p class="note">
Expand Down Expand Up @@ -209,13 +211,13 @@ interface BarcodeDetector {
<dd>This method, when invoked, MUST return a new {{Promise}} |promise| and run the following steps <a>in parallel</a>:
<ol>
<li>Let |supportedFormats| be a new {{Array}}.</li>
<li>If the UA does not support barcode detection, resolve |promise| with |supportedFormats| and abort these steps.</li>
<li>If the UA does not support barcode detection, [=queue a global task=] on the [=relevant global object=] of [=this=] using the [=shape detection task source=] to [=resolve=] |promise| with |supportedFormats| and abort these steps.</li>
<li>Enumerate the {{BarcodeFormat}}s that the UA understands as potentially detectable in images. Add these to |supportedFormats|.
<div class="note">
The UA cannot give a definitive answer as to whether a given barcode format will <i>always</i> be recognized on an image due to e.g. positioning of the symbols or encoding errors. If a given barcode symbology is not in |supportedFormats| array, however, it should not be detectable whatsoever.
</div>
</li>
<li>Resolve |promise| with |supportedFormats|.</li>
<li>[=Queue a global task=] on the [=relevant global object=] of [=this=] using the [=shape detection task source=] to [=resolve=] |promise| with |supportedFormats|.</li>
</ol>
<div class="note">
The list of supported {{BarcodeFormat}}s is platform dependent, some examples are the ones supported by <a href="https://developers.google.com/android/reference/com/google/android/gms/vision/barcode/BarcodeDetector.Builder.html#setBarcodeFormats(int)">Google Play Services</a> and <a href="https://developer.apple.com/documentation/coreimage/ciqrcodefeature?preferredLanguage=occ#overview">Apple's QICRCodeFeature</a>.
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