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Jasper St. Pierre authored
Drawing text with Pango is quite expensive, and drawing text and also blurring it is *really* expensive. To prevent us from drawing a lot of text and then blurring it a lot is *really* expensive. We now cache the blurred pixels for the last layout and shadow we made, which means we can repeatedly draw labels with a blurred text-shadow extremely fast. To detect whether the shadow is up-to-date, we track the serial of the PangoLayout alongside the radius of the box shadow. We don't support inset shadows nor spread on text-shadow, so we don't need to track these.
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