Commit graph

53 commits

Author SHA1 Message Date
Glenn Watson
40d2827806 servo: Merge #7795 - Split Au type into separate crate, with minimal dependencies (from glennw:app-units-crate); r=SimonSapin
Source-Repo: https://github.com/servo/servo
Source-Revision: 35888e5a1d48511ec54ddf8c58f1c7b0c47c5d3c
2015-09-30 15:19:33 -06:00
Ravi Shankar
7d512d50d1 servo: Merge #7698 - sorted the declarations in various files (from Wafflespeanut:sorting); r=frewsxcv
This is a direct extract from my abandoned PR for a lint (#7546), along with some rather clumsy modifications (only on `components/script/dom/mod.rs` and `components/style/lib.rs`), because I had to sort some of the files again to make peace with tidy, which hasn't been educated about sorting yet!

Source-Repo: https://github.com/servo/servo
Source-Revision: a7208869f2903e36f9b2f540b55b50283d7df466
2015-09-23 15:02:56 -06:00
Brandon Fairchild
f7fb1e4b4a servo: Merge #7662 - Check for multiple import blocks separated by whitespace (from nerith:import); r=frewsxcv
Fixes #7381.

Source-Repo: https://github.com/servo/servo
Source-Revision: a0d3c9223f09757124b1520c4f17e94fa8bbe249
2015-09-19 13:34:51 -06:00
Manish Goregaokar
cf0446c9f9 servo: Merge #7536 - More clippy fixes (from Manishearth:clippyfix); r=Ms2ger
Elided almost all the lifetimes and removed needless returns. Mostly done by sed + manual fixes.

r? @nox

Source-Repo: https://github.com/servo/servo
Source-Revision: c2c2646d37614ece5869af861993c3d619f6e003
2015-09-04 07:59:04 -06:00
Simon Sapin
2c2c527fd4 servo: Merge #7496 - Implement CSS3 Calc (from servo:calc_); r=SimonSapin
This is #7185 with one commit added to make it build merged with master, which got support for the `ch` unit in the meantime.

Source-Repo: https://github.com/servo/servo
Source-Revision: a547ae6826cf171c42b090408a4c20d58d1829d9
2015-09-02 02:33:18 -06:00
Patrick Walton
1c17f3c07c servo: Merge #7313 - layout: Make overflow calculation take relative percentages into account (from pcwalton:position-relative-percentage-overflow); r=mbrubeck
This necessitated changing overflow to be calculated by the parent flow
if relatively positioned children are present. That is because the
overflow regions cannot be calculated without knowing relative offsets,
which themselves cannot be calculated without knowing the parent size
(because of percentages). To accomplish this without sacrificing
parallelism in the non-relative case, this patch splits overflow into
"early" and "late" computation. Late overflow computation cannot be
parallelized across children, while early overflow computation can.

Makes the "Apple Music" text show up over the full-bleed promotional
background on apple.com.

r? @SimonSapin -- would appreciate a look over the iframe test case that was changed.

Source-Repo: https://github.com/servo/servo
Source-Revision: dcaf66397a06246b9b4fdca3a10af1508a11f1e8
2015-09-01 12:33:07 -06:00
Johann Tuffe
5c3a5a67f5 servo: Merge #7265 - Add alphabetical order check for use statements (from tafia:tidy-use); r=Ms2ger
close #7112

Source-Repo: https://github.com/servo/servo
Source-Revision: a5fbb2f2a6fa79755f975feff2435abb6a5dd0e9
2015-08-20 07:43:56 -06:00
Corey Farwell
871003a8b5 servo: Merge #7178 - flow::Flow should follow *_mut naming conventions (from frewsxcv:flow-api-mut); r=nox
Fixes #7148

Source-Repo: https://github.com/servo/servo
Source-Revision: 014608f60c45574e6a347f39a96aa33b8eab02e1
2015-08-18 07:31:57 -06:00
Josh Matthews
6a81d499fc servo: Merge #7203 - Add automated style nit checks to test-tidy (from jdm:style); r=Ms2ger
Expands on the work by @wilmoz and cleans up the existing errors. Closes #7180. Closes #7111.

Source-Repo: https://github.com/servo/servo
Source-Revision: e74825f9fde8e222f4ba9bb24b2c2a3864c73e5f
2015-08-16 08:37:40 -06:00
João Oliveira
8410286b02 servo: Merge #7225 - Replace uses of for foo in bar.iter() and for foo in bar.iter_mut() (from jxs:master); r=nox
closes #7197

Source-Repo: https://github.com/servo/servo
Source-Revision: a1b3f477aa541fda4d1b6ccb02c3e56143f4d217
2015-08-15 03:03:21 -06:00
Patrick Walton
feefd8fa17 servo: Merge #6977 - layout: Make sure anonymous table flows are statically positioned (from pcwalton:containing-block-link-crash); r=mbrubeck
The failing `float-applies-to-*` CSS 2.1 tests never really should have
been passing in the first place; they depend on floats inside
fixed-layout tables working properly, which they don't.

Closes #6078.
Closes #6709.
Closes #6858.

r? @mbrubeck

Source-Repo: https://github.com/servo/servo
Source-Revision: 1ddef2997abf51716835017225b282f8a9077cce
2015-08-06 22:11:04 -06:00
Glenn Watson
b4bfd1bd03 servo: Merge #6784 - Implement offsetParent/Top/Left/Width/Height (from glennw:offset-ext); r=pcwalton
Source-Repo: https://github.com/servo/servo
Source-Revision: d66c59a15213dec17f38af0653e9e7e1bf579a95
2015-08-03 18:39:43 -06:00
ecoal95
b32a9cd993 servo: Merge #6423 - Use euclid from crates.io (from emilio:euclid); r=glennw
Sorry for not doing it yesterday, I couldn't.

cc @metajack @SimonSapin

Source-Repo: https://github.com/servo/servo
Source-Revision: 4ebb95ccd8e034007eacb447a054919ef4af2bf7
2015-06-18 20:50:22 -06:00
Patrick Walton
b776a7f734 servo: Merge #6053 - compositing: Implement display ports and avoid creating display lists for items outside it (from pcwalton:displayports); r=glennw
This improves Servo's performance on large pages.

Please double-check the logic when it comes to nested layers—I'm sure I've messed up some of the geometry calculations :)

r? @glennw

Source-Repo: https://github.com/servo/servo
Source-Revision: 0880e54f987bac7c34c934ef6ee36f46475b06e3

--HG--
rename : servo/tests/html/lipsum.html => servo/tests/html/lipsum-large.html
2015-05-19 19:40:36 -05:00
Patrick Walton
c918f5d92e servo: Merge #5911 - layout: Allow inline elements to be containing blocks for absolutely-positioned elements (from pcwalton:absolute-inline-containing-blocks); r=mbrubeck
r? @mbrubeck

Source-Repo: https://github.com/servo/servo
Source-Revision: c0ee952a2a7054dcc7e97990a625c281322dd526
2015-05-13 14:27:21 -05:00
Matt Brubeck
b470ce5d9d servo: Merge #5997 - Fix direction of columns in mixed LTR/RTL tables (from mbrubeck:table-direction); r=pcwalton
Table columns should be layed out according to the 'direction' property of the
table flow, regardless of the 'direction' property of any table-row,
table-rowgroup, etc. flows.

This fixes a number of the `direction-applies-to-*` tests in the CSS2.1 test
suite.

This also simplifies `propagate_column_inline_sizes_to_child` by separating
the code used for table cells from the code for non-cell flows.

r? @pcwalton

Source-Repo: https://github.com/servo/servo
Source-Revision: 844ac2915eab6573c43e7648cfa94cc2d97fa901
2015-05-11 07:50:09 -05:00
Simon Sapin
5d6d967ea0 servo: Merge #5480 - Preliminary steps for CSS Multi-column Layout (from SimonSapin:multicol); r=pcwalton
This add some properties to the style system and a new flow type, but the larger issues of dealing with fragmentation in the flow tree is still an open question.

Source-Repo: https://github.com/servo/servo
Source-Revision: 1e150140bd12624ad357e3168fb496079fb8ec7c

--HG--
rename : servo/components/layout/table_caption.rs => servo/components/layout/multicol.rs
2015-04-28 19:48:45 -05:00
Ms2ger
33e1b9c8ab servo: Merge #5888 - Prepare for the rustup (from Ms2ger:prepare-rustup); r=SimonSapin
Source-Repo: https://github.com/servo/servo
Source-Revision: ab2d07db1fabd7ad9590aa7296038bbc91806c3f
2015-04-28 17:52:49 -05:00
Patrick Walton
cb206c9929 servo: Merge #5831 - layout: Make margin: auto work properly with tables (from pcwalton:amazon-table-sizing); r=mbrubeck
r? @mbrubeck

Source-Repo: https://github.com/servo/servo
Source-Revision: 32b9c0962b7e42ac6d298f5959f1e48d4cc99c5a
2015-04-28 11:44:39 -05:00
Simon Sapin
524056a01d servo: Merge #5870 - layout: Implement most of border-collapse per CSS 2.1 § 17.6.2 (from SimonSapin:border-collapse); r=SimonSapin
Fixes #5300, which it is a rebase of.

Known issues:

* Collapsed borders do not correctly affect the border-box of the table
  itself.

* The content widths of all cells in a column and the content height of
  all cells in a row is the same in this patch, but not in Gecko and
  WebKit.

* Corners are not painted well. The spec does not say what to do here.

* Column spans are not handled well. The spec does not say what to do
  here either.

Source-Repo: https://github.com/servo/servo
Source-Revision: 8a4555cc53bc1bbb21a08eb6f010cb1215034419
2015-04-27 12:29:15 -05:00
Ms2ger
374d18472e servo: Merge #5827 - Use as_slice less (from Ms2ger:slice); r=mbrubeck
Source-Repo: https://github.com/servo/servo
Source-Revision: 79be3b967668e46a4289f4fc8fce2b4f457cab23
2015-04-24 12:12:53 -05:00
Ms2ger
7b37ef8efe servo: Merge #5801 - Stop using the deprecated range function (from Ms2ger:range); r=pcwalton
Source-Repo: https://github.com/servo/servo
Source-Revision: 43e664cda1dd562935fe5e4fdd92e5abcf6fb8f9
2015-04-22 18:24:21 -05:00
Manish Goregaokar
5dbe6eb389 servo: Merge #5296 - Replace unsafe_blocks by unsafe_code (from servo:unsafe_code); r=Ms2ger
Source-Repo: https://github.com/servo/servo
Source-Revision: 29a36adbe7d87fb38ba9bef3a718c6c823fb5977
2015-03-21 05:12:45 -06:00
Matt Brubeck
a9553b022c servo: Merge #5233 - Fixes for positioning of RTL blocks (from mbrubeck:rtl-position); r=SimonSapin
This fixes a bug in finding the top left corner of an RTL block in physical coordinates.  (The old code used the `start` point of the `position` rect, which is not always the top left.)

It also fixes the setting of `position.start.i` in certain mixed LTR/RTL cases.

There is still a bug related to `position.size` for RTL blocks with margins.  See the FIXME comments for details.

r? @pcwalton or @SimonSapin

Source-Repo: https://github.com/servo/servo
Source-Revision: b255b49e2e2246ff8bf7f8751088bfe0a0ee41a2
2015-03-17 12:33:53 -06:00
Patrick Walton
c12b663e80 servo: Merge #4417 - layout: Implement border-spacing per CSS 2.1 § 17.6.1 and the legacy cellspacing attribute per HTML5 § 14.3.9 (from pcwalton:border-spacing); r=larsbergstrom
Table layout code has been refactored to push the spacing down to
rowgroups and rows; this will aid the implementation of
`border-collapse` as well.

r? @SimonSapin

Source-Repo: https://github.com/servo/servo
Source-Revision: 8e811229bae6b338fabcd7df602079730c942889
2015-03-12 13:03:49 -06:00
Patrick Walton
c4615436ae servo: Merge #5160 - layout: Implement ordered lists, CSS counters, and quotes per CSS 2.1 § 12.3-12.5 (from pcwalton:counters-redux); r=SimonSapin
Only simple alphabetic and numeric counter styles are supported. (This
is most of them though.)

Although this PR adds a sequential pass to layout, I verified that on
pages that contain a reasonable number of ordered lists (Reddit
`/r/rust`), the time spent in generated content resolution is dwarfed by
the time spent in the parallelizable parts of layout. So I don't expect
this to negatively affect our parallelism expect perhaps in pathological
cases.

Reconstructed from #5138 via raw diffing.

r? @SimonSapin

Source-Repo: https://github.com/servo/servo
Source-Revision: fd1bb49a65dd998c8ef9890a1576aaf62ddfdba1
2015-03-09 23:24:47 -06:00
Dan Fox
f6711c6464 servo: Merge #5135 - Fix 5120 rename layout util (from iamdanfox:fix-5120-rename-layout-util); r=jdm
A simple rename/refactor (https://github.com/servo/servo/issues/5120)

My first servo contribution!

Source-Repo: https://github.com/servo/servo
Source-Revision: 7fc37dfaa76c9265e6d2145fe5ef2fba5f6bd013
2015-03-05 11:09:58 -07:00
Simon Sapin
9d0586a22d servo: Revert "layout: Implement ordered lists, CSS counters, and quotes per CSS 2.1"
This reverts commit 30fd28d1077fbb3f47140f6ab1252c0d24f44d23.

Source-Repo: https://github.com/servo/servo
Source-Revision: 4c1d778ced267eeef790d4166e361d9348b933d3
2015-03-03 21:16:24 +01:00
Simon Sapin
73082d1626 servo: Merge #5067 - layout: Implement ordered lists, CSS counters, and quotes per CSS 2.1 § 12.3-12.5 (from servo:counters); r=SimonSapin
Only simple alphabetic and numeric counter styles are supported. (This
is most of them though.)

Although this PR adds a sequential pass to layout, I verified that on
pages that contain a reasonable number of ordered lists (Reddit
`/r/rust`), the time spent in generated content resolution is dwarfed by
the time spent in the parallelizable parts of layout. So I don't expect
this to negatively affect our parallelism expect perhaps in pathological
cases.

Moved from #4544, because Critic.

Fixes #4544.

Source-Repo: https://github.com/servo/servo
Source-Revision: 5cd6316addc1acf145ed3220719387ef6ef08d2f
2015-03-03 10:42:52 -07:00
Patrick Walton
150bdee4d8 servo: Merge #4994 - layout: Add an option to visualize parallel layout (from pcwalton:layout-tinting); r=pcwalton
r? @metajack

Source-Repo: https://github.com/servo/servo
Source-Revision: d26345f868e4261760ce204bdc383941e8f14621
2015-02-20 23:06:48 -07:00
Simon Sapin
da87abc762 servo: Merge #4893 - Upgrade to rustc ba2f13ef0 2015-02-04 (from servo:rustup_2015-01-31); r=Ms2ger,glennw
Ready for review.

Final link step on android fails, but we know how to fix it and will add it to this branch soon.

Source-Repo: https://github.com/servo/servo
Source-Revision: 2cc08f289ab909de44fa09a07b2c43b70ce379b9

--HG--
rename : servo/ports/gonk/build.rs => servo/support/rust-task_info/build.rs
2015-02-11 17:24:45 -07:00
Simon Sapin
f19ec826ce servo: Merge #4757 - Bring CSS parse error reporting back (from servo:newnewnewcss); r=mbrubeck
(Still off by default. Enable with `RUST_LOG=style`.)

r? @mbrubeck

Source-Repo: https://github.com/servo/servo
Source-Revision: 172aed535be3c34775824dac64ad2b91fc379ad5

--HG--
rename : servo/components/style/properties/mod.rs.mako => servo/components/style/properties.mako.rs
2015-01-30 15:27:53 -07:00
Patrick Walton
d668ccc421 servo: Merge #4458 - layout: Implement floated list items (from pcwalton:floated-lists); r=mbrubeck
This patch also makes Servo not crash when
`generated_containing_block_rect()` is called on a list item (as, for
example, GitHub does), and for good measure I added the fix to other
flows as well.

r? @mbrubeck

Source-Repo: https://github.com/servo/servo
Source-Revision: 221a343883f510c7743908136438f5ed40bd17ed
2015-01-28 21:18:53 -07:00
Josh Matthews
78741af324 servo: Merge #4719 - Update rustc to 00b112c45a604fa6f4b59af2a40c9deeadfdb7c6/rustc-1.0.0-dev (from servo:rustup_20150109); r=jdm
Source-Repo: https://github.com/servo/servo
Source-Revision: 3f9012864a2cd927cf17a8e11dfa6922add1b7df
2015-01-27 18:15:50 -07:00
Ms2ger
e5578c14fd servo: Merge #4554 - Update rustc to revision 2cfb5acb5a2751c759627377e602bac4f88f2d19 (from servo:rustup_20141221); r=jdm
Source-Repo: https://github.com/servo/servo
Source-Revision: 1d7148c79f9124779a910fd5291c5fa0543b2dae
2015-01-08 08:00:57 -07:00
Patrick Walton
707d7cd93e servo: Merge #4460 - layout: Paint stacking contexts' overflow areas properly (from pcwalton:stacking-context-overflow); r=glennw
This was making `box-shadow` not show up in many cases, in particular,
but the effects were not limited to that.

r? @glennw

Source-Repo: https://github.com/servo/servo
Source-Revision: 499d17f564d699e5e290e8a3859f64e7536827a7
2015-01-04 18:51:48 -07:00
Glenn Watson
b185394a0f servo: Merge #4405 - Update rustc to revision 3dcd2157403163789aaf21a9ab3c4d30a7c6494d (from servo:rustup_20141124); r=jdm
Source-Repo: https://github.com/servo/servo
Source-Revision: fbf42c951b2f53d91e2f32f8035484a07ea83493
2014-12-17 18:45:49 -07:00
Patrick Walton
90a61bb1c7 servo: Merge #4289 - style: Implement basic column spans, quirks mode, and the legacy bgcolor and border attributes (from pcwalton:hacker-news); r=SimonSapin
This patch provides some of the groundwork for column spans greater than
1. It implements the column-span CSS property as well as the
corresponding colspan attribute; although the former is not
well-specified outside of CSS multi-column layout, INTRINSIC refers to
it. Although width is distributed to spanning columns, they do not yet
contribute minimum and preferred widths; this will be implemented in a
follow-up.

The parsing for the legacy bgcolor and border attributes is
implemented according to the WHATWG HTML specification.

Additionally, this patch cleans up some miscellaneous formatting issues,
refactors layout/css somewhat to eliminate needless levels of
indirection, and cleans up the handling of table rowgroups.

New Hacker News screenshot: http://i.imgur.com/hnl2a7E.png

Source-Repo: https://github.com/servo/servo
Source-Revision: 8e31e5f98747e4b42dafcc4b076fac46aeb09310
2014-12-15 19:33:46 -07:00
Patrick Walton
d6d4d3ae05 servo: Merge #4328 - layout: Implement text-indent per CSS 2.1 § 16.1 (from pcwalton:text-indent); r=SimonSapin
I had to use a somewhat unconventional method of computing text
indentation (propagating from blocks down to inlines) because of the way
containing blocks are handled in Servo.

(As a side note, neither Gecko nor WebKit correctly handles percentages
in `text-align`, at least incrementally -- i.e. when the percentages are
relative to the viewport and the viewport is resized.)

r? @SimonSapin

Source-Repo: https://github.com/servo/servo
Source-Revision: be6612193786ef22810fd66b3ce244a7e66cbcf4
2014-12-12 15:57:46 -07:00
Patrick Walton
cf7e6d5a0f servo: Merge #4339 - layout: Make table layout idempotent (from pcwalton:refactor-tables); r=mbrubeck
By "idempotent" I mean that later passes do not stomp on data from
earlier passes, so that we can run the passes individually for
incremental reflow. The main change here was to stop overwriting the
"minimum inline-size" field of each column with the column's computed
inline-size.

r? @mbrubeck

Source-Repo: https://github.com/servo/servo
Source-Revision: 909dd0e80f5c6a9051da6e2f70d77186cc545b1a
2014-12-11 18:06:53 -07:00
Patrick Walton
c45bdbbfb9 servo: Merge #3904 - layout: Incrementalize reflow of block formatting contexts impacted by floats, and make float placement idempotent (from pcwalton:maze-solver-float-placement); r=cgaebel
r? @glennw @cgaebel

Source-Repo: https://github.com/servo/servo
Source-Revision: a07401ca4e9ab26d66c7a02e710cea143caca401
2014-11-18 16:39:25 -07:00
Glenn Watson
22c4035692 servo: Merge #3948 - Rust upgrade to rustc hash b03a2755193cd756583bcf5831cf4545d75ecb8a (from servo:rustup-20141105_2); r=Manishearth
Source-Repo: https://github.com/servo/servo
Source-Revision: c5e1b0d32e17fad29799023c85e2e73ac89c3af7
2014-11-12 20:48:31 -07:00
Martin Robinson
1628fc65f1 servo: Merge #3857 - Have ContentBox(es)Queries consult the flow tree (from mrobinson:queries); r=pcwalton
Instead of looking at the display tree, have ContentBox(es)Query consult
the flow tree. This allow optimizing away parts of the display tree
later. To do this we need to be more careful about how we send reflow
requests, only querying the flow tree when possible.

Fixes #3790.

Source-Repo: https://github.com/servo/servo
Source-Revision: c9089c45c4b7d40419233b48a192d85a8ad71c99
2014-11-03 12:03:37 -07:00
Patrick Walton
c0e4f093a6 servo: Merge #3860 - layout: Make incremental reflow more fine-grained by introducing "reflow out-of-flow" and "reconstruct flow" damage bits (from pcwalton:reflow-out-of-flow); r=glennw
This is the last PR and most of the work for the maze solver and RoboHornet.

r? @glennw
cc @cgaebel

Source-Repo: https://github.com/servo/servo
Source-Revision: 035ff19e4a5995989c5fd34928af2a6690bb8062
2014-10-31 14:39:34 -06:00
Patrick Walton
10068dfc8b servo: Merge #3771 - layout: Largely move display list building out to a separate file (from pcwalton:display-list-building-cleanup); r=mrobinson
`layout::fragment` and `layout::block` were getting too big.

r? @mrobinson

Source-Repo: https://github.com/servo/servo
Source-Revision: 01f6a8102dfbb7eaef564acf8891088011905b59
2014-10-22 10:54:35 -06:00
Clark Gaebel
aaa4f1720f servo: Merge #3706 - Fix image_dynamic_remove reftest with incremental layout turned out (from cgaebel:fix-image-dynamic-remove); r=pcwalton
This also adds some extra debugging infrastructure which I found useful tracking
this bug down. A regression in the br reftests is also uncovered by this patch,
which I'll work on fixing next.

EDIT: nevermind. no regression, I just tested that before a rebase.

r? @pcwalton

Source-Repo: https://github.com/servo/servo
Source-Revision: b86344b697f814b982e52f4a72c26d58c915c37b
2014-10-17 12:15:23 -06:00
Patrick Walton
77c47e9d1a servo: Merge #3609 - layout: Rewrite intrinsic inline-size and automatic table layout to match L. David Baron's work-in-progress specification (from pcwalton:tables); r=SimonSapin
http://dbaron.org/css/intrinsic/

Column spans are not yet supported.

This effectively adds support for percentage widths, and it also fixes
many bugs, improving the layout of Google and Wikipedia.

r? @SimonSapin

Source-Repo: https://github.com/servo/servo
Source-Revision: e2d7777c41135b71293c195d2a9d7a1bc2afd0ca
2014-10-14 15:42:32 -06:00
Patrick Walton
0aeca90f2d servo: Merge #3622 - layout: Introduce support for legacy presentational attributes to selector matching, and use it for <input size> and <td width> (from pcwalton:html4ever); r=jdm
This implements a general framework for legacy presentational attributes
to the DOM and style calculation, so that adding more of them later will
be straightforward.

Source-Repo: https://github.com/servo/servo
Source-Revision: 0aeecfc41d5f0c637960fcddf87cc2db3e5efeea
2014-10-14 14:06:36 -06:00
Patrick Walton
de231d63b3 servo: Merge #3631 - layout: Store containing block inline-size separately rather than writing it to a temporary location and overwriting it (from pcwalton:idempotent-inline-size); r=glennw
This makes layout more idempotent, which is important for incremental
layout.

Also converts `is_root` to a set of flags and fixes a `TODO` concerning
percentage inline heights of images.

r? @glennw

Source-Repo: https://github.com/servo/servo
Source-Revision: 7902ccf8507a7ec31515bfb5824dc4727564fe4d
2014-10-13 18:03:40 -06:00
Patrick Walton
c3a687251b servo: Merge #3546 - layout: Implement the correct hypothetical box behavior for absolutely-positioned elements declared with display: inline (from pcwalton:absolute-inline); r=glennw
Although the computed `display` property of elements with `position:
absolute` is `block`, `position: absolute; display: inline` can still
behave differently from `position: absolute; display: block`. This is
because the hypothetical box for `position: absolute` can be at the
position it would have been if it had `display: inline`. CSS 2.1 §
10.3.7 describes this case in a parenthetical:

"The static-position containing block is the containing block of a
hypothetical box that would have been the first box of the element if
its specified 'position' value had been 'static' and its specified
'float' had been 'none'. (Note that due to the rules in section 9.7 this
hypothetical calculation might require also assuming a different
computed value for 'display'.)"

To handle this, I had to change both style computation and layout. For
the former, I added an internal property
`-servo-display-for-hypothetical-box`, which stores the `display` value
supplied by the author, before the computed value is calculated. Flow
construction now uses this value.

As for layout, implementing the proper behavior is tricky because the
position of an inline fragment in the inline direction cannot be
determined until height assignment, which is a parallelism hazard
because in parallel layout widths are computed before heights. However,
in this particular case we can avoid the parallelism hazard because the
inline direction of a hypothetical box only affects the layout if an
absolutely-positioned element is unconstrained in the inline direction.
Therefore, we can just lay out such absolutely-positioned elements with
a bogus inline position and fix it up once the true inline position of
the hypothetical box is computed. The name for this fix-up process is
"late computation of inline position" (and the corresponding fix-up for
the block position is called "late computation of block position").

This improves the header on /r/rust.

r? @glennw

Source-Repo: https://github.com/servo/servo
Source-Revision: f7d2fb6ff86afff7a5b674f751af9370a5a6b142
2014-10-01 19:36:25 -06:00