First, we define computed::CSSPixelLength which contains a CSSFloat, a
pixel value, and then we replace computed::Length with CSSPixelLength.
Therefore, the |ComputedValue| of NoCalcLength, AbsoluteLength,
FontRelativeLength, ViewportPercentageLength, CharacterWidth, and
PhysicalLength is CSSPixelLength.
Besides, we drop NonNegativeAu, and replace computed::NonNegativeLength
with NonNegative<computed::Length>. (i.e. NonNegative<CSSPixelLength>)
The alias is left there temporarilly and will be removed completely in a later commit where
also components/style/gecko/generated/structs_{debug|release}.rs are re-generated (they still
use the old alias).
Remove incomplete and buggy support for text-orientation in Servo.
Make the property values align with Gecko and the latest draft of CSS
Writing Modes Level 3.
This was making us fall in a loop where the start split was empty, but we didn't
ignore it because the current fragment had this flag, but then we treated it
differently depending on the white_space property.
Not totally sure this is the proper fix, but it makes sense to me. In case it
is:
Fixes#12369.
Replace character indices with UTF-8 byte offsets throughout the code dealing
with text shaping and breaking. This eliminates a lot of complexity when
converting from one to the other, and interoperates better with the rest of
the Rust ecosystem.
Empty fragments may need to be layed out to draw borders, padding/background,
and insertion points. (Fragments that consist of discardable whitespace and
control characters, on the other hand, can still be discarded.)
This ends up preserving some useless empty fragments. It's possible we could
avoid this by storing some sort of flag on "important" empty fragments, so we
can discard the rest.
This fixes two problems that could cause scanned text fragments to end up with
incorrect LAST_FRAGMENT_OF_ELEMENT or FIRST_FRAGMENT_OF_ELEMENT flags:
1. If a single unscanned fragment was split into multiple scanned fragments,
then all of them would inherit its flags. We need to clear these flags,
except for the first and last scanned fragment.
2. When an unscanned fragment generated zero scanned fragments, we correctly
called `meld_with_next_inline_fragment` to transfer LAST_FRAGMENT flags to
the preceding fragment, but we didn't do anything to transfer
FIRST_FRAGMENT flags to the following fragment. We can fix this by calling
`meld_with_prev_inline_fragment` on the following fragment.
Before this fix, if a TextRun containing an insertion point was split into
multiple ScannedText fragments, text layout would draw an insertion point
inside of each of the fragments. This patch records the insertion point
position at most once per TextRun, and copies it only into the appropriate
ScannedText fragment.
Reduce size of layout::fragment::Fragment struct
This reduces the size of the SpecificFragmentInfo enum from 48 to 24.
r? @pcwalton
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This is the first part of #10185. More to follow. I have built this locally with both servo and geckolib without errors; let's see if it succeeds on all platforms as well.
Highlight selected text in input fields
Fixes#9993. This does not yet allow stylesheets to set the selection colors; instead it uses a hard-coded orange background and white foreground.
r? @pcwalton
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