[Webkit-unassigned] [Bug 157132] [FreeType] ASSERTION FAILED: !lookupForWriting(Extractor::extract(entry)).second in FontCache::getVerticalData()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157132

Darin Adler <darin at apple.com> changed:

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--- Comment #2 from Darin Adler <darin at apple.com> ---
Comment on attachment 277613
  --> https://bugs.webkit.org/attachment.cgi?id=277613
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=277613&action=review

> Source/WebCore/platform/graphics/FontCache.cpp:326
> +        if (!data->isOpenType()) {
> +            fontVerticalDataCache().remove(addResult.iterator);
> +            return nullptr;
> +        }

This isn’t good, because it will not cache the negative result and so if OpenTypeVerticalData::create returns something that is not OpenType then it will call OpenTypeVerticalData::create again and again every time this function is called. And it will also add/remove an element to/from the hash map every time.

I think what we want instead is:

    if (!data->isOpenType())
        data = nullptr;

We will cache a nullptr and not call OpenTypeVerticalData::create again next time.

Separately, I also think it’s peculiar that OpenTypeVerticalData::create can create something that returns false to isOpenType. There’s some kind of naming mistake there. I would think, given its name, that function would return nullptr if the data is "not OpenType".

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