Add support for table-layout: fixed (#33384)

More details might be needed to fully support the feature, but this
covers the basic functionality.

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>

components/layout_2020/table/layout.rs

@@ -12,6 +12,7 @@ use style::computed_values::border_collapse::T as BorderCollapse;
 use style::computed_values::box_sizing::T as BoxSizing;
 use style::computed_values::caption_side::T as CaptionSide;
 use style::computed_values::empty_cells::T as EmptyCells;
+use style::computed_values::table_layout::T as TableLayoutMode;
 use style::computed_values::visibility::T as Visibility;
 use style::logical_geometry::WritingMode;
 use style::properties::ComputedValues;
@@ -172,6 +173,9 @@ impl<'a> TableLayout<'a> {
         layout_context: &LayoutContext,
         writing_mode: WritingMode,
     ) {
+        let is_in_fixed_mode = self.table.style.get_table().clone_table_layout() ==
+            TableLayoutMode::Fixed &&
+            !self.table.style.box_size(writing_mode).inline.is_auto();
         let row_measures = vec![LogicalVec2::zero(); self.table.size.width];
         self.cell_measures = vec![row_measures; self.table.size.height];
 
@@ -201,10 +205,24 @@ impl<'a> TableLayout<'a> {
 
                 let (size, min_size, max_size) =
                     get_outer_sizes_from_style(&cell.style, writing_mode, &padding_border_sums);
-                let mut inline_content_sizes = cell.contents.contents.inline_content_sizes(
+                let percentage_contribution =
+                    get_size_percentage_contribution_from_style(&cell.style, writing_mode);
+
+                // <https://drafts.csswg.org/css-tables/#in-fixed-mode>
+                // > When a table-root is laid out in fixed mode, the content of its table-cells is ignored
+                // > for the purpose of width computation, the aggregation algorithm for column sizing considers
+                // > only table-cells belonging to the first row track
+                let inline_measure = if is_in_fixed_mode && row_index > 0 {
+                    CellOrTrackMeasure::zero()
+                } else {
+                    let mut inline_content_sizes = if is_in_fixed_mode {
+                        ContentSizes::zero()
+                    } else {
+                        cell.contents.contents.inline_content_sizes(
                             layout_context,
                             &IndefiniteContainingBlock::new_for_style(&cell.style),
-                );
+                        )
+                    };
                     inline_content_sizes.min_content += padding_border_sums.inline;
                     inline_content_sizes.max_content += padding_border_sums.inline;
 
@@ -213,14 +231,15 @@ impl<'a> TableLayout<'a> {
                         .max_content
                         .max(inline_content_sizes.min_content);
 
-                let percentage_contribution =
-                    get_size_percentage_contribution_from_style(&cell.style, writing_mode);
-
                     // These formulas differ from the spec, but seem to match Gecko and Blink.
-                let outer_min_content_width = inline_content_sizes
+                    let outer_min_content_width = if is_in_fixed_mode {
+                        size.inline.min(max_size.inline).max(min_size.inline)
+                    } else {
+                        inline_content_sizes
                             .min_content
                             .min(max_size.inline)
-                    .max(min_size.inline);
+                            .max(min_size.inline)
+                    };
                     let outer_max_content_width = if self.columns[column_index].constrained {
                         inline_content_sizes
                             .min_content
@@ -236,12 +255,13 @@ impl<'a> TableLayout<'a> {
                     };
                     assert!(outer_min_content_width <= outer_max_content_width);
 
-                let inline_measure = CellOrTrackMeasure {
+                    CellOrTrackMeasure {
                         content_sizes: ContentSizes {
                             min_content: outer_min_content_width,
                             max_content: outer_max_content_width,
                         },
                         percentage: percentage_contribution.inline,
+                    }
                 };
 
                 // This measure doesn't take into account the `min-content` and `max-content` sizes.

tests/wpt/meta/css/CSS2/bidi-text/direction-applies-to-001.xht.ini

@@ -1,2 +0,0 @@
-[direction-applies-to-001.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/bidi-text/direction-applies-to-002.xht.ini

@@ -1,2 +0,0 @@
-[direction-applies-to-002.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/bidi-text/direction-applies-to-003.xht.ini

@@ -1,2 +0,0 @@
-[direction-applies-to-003.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/bidi-text/direction-applies-to-004.xht.ini

@@ -1,2 +0,0 @@
-[direction-applies-to-004.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/tables/fixed-table-layout-002a.xht.ini

@@ -1,2 +0,0 @@
-[fixed-table-layout-002a.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/tables/separated-border-model-004c.xht.ini

@@ -1,2 +0,0 @@
-[separated-border-model-004c.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/tables/separated-border-model-004d.xht.ini

@@ -1,2 +0,0 @@
-[separated-border-model-004d.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/ui/overflow-applies-to-007.xht.ini

@@ -1,2 +0,0 @@
-[overflow-applies-to-007.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/ui/overflow-applies-to-013.xht.ini

@@ -1,2 +0,0 @@
-[overflow-applies-to-013.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/ui/overflow-applies-to-014.xht.ini

@@ -1,2 +0,0 @@
-[overflow-applies-to-014.xht]
-  expected: FAIL

tests/wpt/meta/css/CSS2/visufx/overflow-applies-to-001.xht.ini

@@ -1,2 +0,0 @@
-[overflow-applies-to-001.xht]
-  expected: FAIL

tests/wpt/meta/css/css-flexbox/flexbox_flex-formatting-interop.html.ini

@@ -1,2 +0,0 @@
-[flexbox_flex-formatting-interop.html]
-  expected: FAIL

tests/wpt/meta/css/css-flexbox/flexbox_table-fixed-layout.html.ini

@@ -1,2 +0,0 @@
-[flexbox_table-fixed-layout.html]
-  expected: FAIL

tests/wpt/meta/css/css-tables/column-track-merging.html.ini

@@ -5,9 +5,6 @@
   [main table 4]
     expected: FAIL
 
-  [main table 5]
-    expected: FAIL
-
   [main table 10]
     expected: FAIL
 

tests/wpt/meta/css/css-tables/fixed-layout-1.html.ini

@@ -1,3 +0,0 @@
-[fixed-layout-1.html]
-  [Table-layout:fixed grows the table if needed for minimum-width]
-    expected: FAIL

tests/wpt/meta/css/css-tables/table-cell-overflow-auto-scrolled.html.ini

@@ -1,2 +0,0 @@
-[table-cell-overflow-auto-scrolled.html]
-  expected: FAIL

tests/wpt/meta/css/css-tables/tentative/column-widths.html.ini

@@ -1,7 +1,4 @@
 [column-widths.html]
-  [table 3]
-    expected: FAIL
-
   [table 14]
     expected: FAIL
 

tests/wpt/meta/css/css-tables/tentative/table-width-redistribution-fixed-padding.html.ini

@@ -1,19 +1,7 @@
 [table-width-redistribution-fixed-padding.html]
-  [table 1]
-    expected: FAIL
-
-  [table 4]
-    expected: FAIL
-
-  [table 5]
-    expected: FAIL
-
   [table 6]
     expected: FAIL
 
-  [table 9]
-    expected: FAIL
-
   [table 10]
     expected: FAIL
 
@@ -26,9 +14,6 @@
   [table 13]
     expected: FAIL
 
-  [table 14]
-    expected: FAIL
-
   [table 15]
     expected: FAIL
 

tests/wpt/meta/css/css-tables/tentative/table-width-redistribution-fixed.html.ini

@@ -2,53 +2,11 @@
   [table 3]
     expected: FAIL
 
-  [table 4]
-    expected: FAIL
-
-  [table 7]
-    expected: FAIL
-
-  [table 8]
-    expected: FAIL
-
-  [table 9]
-    expected: FAIL
-
-  [table 10]
-    expected: FAIL
-
-  [table 11]
-    expected: FAIL
-
-  [table 14]
-    expected: FAIL
-
   [table 15]
     expected: FAIL
 
-  [table 16]
-    expected: FAIL
-
-  [table 17]
-    expected: FAIL
-
-  [table 18]
-    expected: FAIL
-
   [table 19]
     expected: FAIL
 
-  [table 22]
-    expected: FAIL
-
-  [table 24]
-    expected: FAIL
-
-  [table 25]
-    expected: FAIL
-
-  [table 26]
-    expected: FAIL
-
   [table 12]
     expected: FAIL