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Preserve floating point precision and delay rounding until the last
moment when figuring out where to paint background layers. This fixes an
issue on Acid3 where a thin sliver of red was visible because the
background X position was incorrectly rounded by 1px.
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By using enclosing_int_rect(), borders and backgrounds of boxes were
sometimes 1 pixel off, making things slightly larger than they should
be. Fix this by using to_rounded() instead of enclosing_int_rect().
There's definitely more of these type of issues lurking in the code,
and we'll get to them in time.
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This fixes the placement of several background images on Acid2, most
notably the background of the eyes and the red rectangle near the bottom
of the head.
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Now that calc() is also resolved in to_px(), code in the form
`foo.resolved(bar).to_px(bar)` can be simplified to `foo.to_px(bar)`.
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Nobody makes undefined Lengths now, (although actually removing
Undefined will come in a later commit) so we can remove this parameter,
and `resolved_or_auto()`/`resolved_or_zero()`.
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Most of the time, we cannot resolve a `calc()` expression until we go to
use it. Since any `<length-percentage>` can legally be a `calc
()`, let's store it in `LengthPercentage` rather than make every single
user care about this distinction.
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Despite looking like it was still needed, it was only used for passing
to other calls to Length::resolved() recursively. This makes the
various `foo.resolved().resolved()` calls a lot less awkward.
(Though, still quite awkward.)
I think we'd need to separate calculated lengths out to properly tidy
these calls up, but one yak at a time. :^)
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Not much needed changing this time, hurrah! :^)
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Checking these for `auto` is awkward, but separating that will come
later. :^)
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This is including the `cover` and `contain` modes.
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This reimplements image tiling instead of using `Painter::blit_tiled()`,
so that we will be able to handle CSS's more complicated repetition
rules. (Like `background-repeat: space`) Otherwise this does the same as
before. :^)
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We now pass in the Layout Node so that we can read the BoxModelMetrics.
Renamed a couple of variables too for clarity.
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Previously, a `background-repeat` value of `no-repeat` in a direction
would cause the image to be drawn at exactly that size. This was fine if
the image was smaller than the element, but if it was larger, it would
draw outside its bounds. Now, it behaves itself. :^)
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This makes the code accessible to things that aren't a Box, such as
InlineNode.
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