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[CSS Paint API] Pass snapped concrete size to paint function #518

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Merged
merged 6 commits into from
Apr 5, 2018
Merged

[CSS Paint API] Pass snapped concrete size to paint function #518

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09bd3e2
changed to snapped concret size
xidachen Nov 14, 2017
ece4b77
updated rendering context width height
xidachen Nov 14, 2017
afc97a4
change the description of snappedConcreteObjectSize
xidachen Nov 16, 2017
5ae88e0
change the description
xidachen Nov 16, 2017
738c81b
fix typo
xidachen Nov 16, 2017
9413d54
fix more typo
xidachen Nov 16, 2017
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10 changes: 5 additions & 5 deletions css-paint-api/Overview.bs
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Expand Up @@ -452,11 +452,11 @@ Note: The user agent can optionally defer drawing images which are <a>paint-inva

The <a>draw a paint image</a> function is invoked by the user agent during the <a>object size
negotiation</a> algorithm which is responsible for rendering an <<image>>, with |snappedConcreteObjectSize|
defined as follows. Let |concreateObjectSize| be the <a>concrete object size</a> of the <a>box</a>, and
|deviceObjectSize| be the |concreateObjectSize| multiplied by the {{PaintWorkletGlobalScope/devicePixelRatio}}.
If the |deviceObjectSize| is non-integral, then adjust it to align with pixel boundary. Finally, set
|snappedConcreateObjectSize| to the adjusted |deviceObjectSize| divided by the
{{PaintWorkletGlobalScope/devicePixelRatio}}.
defined as follows. Let |concreateObjectSize| be the <a>concrete object size</a> of the <a>box</a>.
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s/concreateObjectSize/concreteObjectSize/ here and below.

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Fixed :)

The |snappedConcreateObjectSize| is usually the same as the |concreateObjectSize|. However, the
user agent may adjust the size such that it paints to pixel boundaries. If it does, the user agent
should adjust the |snappedConcreateObjectSize| by the proportional change from its original size
such that the <<paint()>> function can adjust the drawing accordingly.

For the purposes of the <a>object size negotiation</a> algorithm, the paint image has no
<a>intrinsic dimensions</a>.
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