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LibWeb: Improve span column width distribution

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Compute the contributions to a spanning cell width from each cell in the
span. This better handles uneven column widths, since each cell
contribution is proportional with its own width as opposed to the own
width of the first cell in the span.

This better matches the behavior of other browsers and further aligns
with the specification.
This commit is contained in:
Andi Gallo 2023-06-19 09:28:04 +00:00 • committed by Andreas Kling
parent b37fbcb159
commit ac6af51549
6 changed files with 118 additions and 62 deletions
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37
Userland/Libraries/LibWeb/Layout/TableFormattingContext.cpp
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@ -261,27 +261,26 @@ void TableFormattingContext::compute_table_measures()
// Define the baseline border spacing as the sum of the horizontal border-spacing for any columns spanned by the cell, other than the one in which the cell originates.
auto baseline_border_spacing = border_spacing<RowOrColumn>() * (cell_span_value - 1);
// The contribution of the cell is the sum of:
// the min-content size of the column based on cells of span up to N-1
auto cell_min_contribution = rows_or_columns[cell_start_rc_index].min_size;
// and the product of:
// - the ratio of the max-content size based on cells of span up to N-1 of the column to the baseline max-content size
// - the outer min-content size of the cell minus the baseline max-content size and baseline border spacing, or 0 if this is negative
cell_min_contribution += (rows_or_columns[cell_start_rc_index].max_size / baseline_max_content_size)
* max(CSSPixels(0), cell_min_size<RowOrColumn>(cell) - baseline_max_content_size - baseline_border_spacing);
// The contribution of the cell is the sum of:
// the max-content size of the column based on cells of span up to N-1
auto cell_max_contribution = rows_or_columns[cell_start_rc_index].max_size;
// and the product of:
// - the ratio of the max-content size based on cells of span up to N-1 of the column to the baseline max-content size
// - the outer max-content size of the cell minus the baseline max-content size and the baseline border spacing, or 0 if this is negative
cell_max_contribution += (rows_or_columns[cell_start_rc_index].max_size / baseline_max_content_size)
* max(CSSPixels(0), cell_max_size<RowOrColumn>(cell) - baseline_max_content_size - baseline_border_spacing);
// Spread contribution to all rows / columns, since we've weighted the gap to the desired spanned size by the the
// Add contribution from all rows / columns, since we've weighted the gap to the desired spanned size by the the
// ratio of the max-content size based on cells of span up to N-1 of the row / column to the baseline max-content width.
for (auto rc_index = cell_start_rc_index; rc_index < cell_end_rc_index; rc_index++) {
// The contribution of the cell is the sum of:
// the min-content size of the column based on cells of span up to N-1
auto cell_min_contribution = rows_or_columns[rc_index].min_size;
// and the product of:
// - the ratio of the max-content size based on cells of span up to N-1 of the column to the baseline max-content size
// - the outer min-content size of the cell minus the baseline max-content size and baseline border spacing, or 0 if this is negative
cell_min_contribution += (rows_or_columns[rc_index].max_size / baseline_max_content_size)
* max(CSSPixels(0), cell_min_size<RowOrColumn>(cell) - baseline_max_content_size - baseline_border_spacing);
// The contribution of the cell is the sum of:
// the max-content size of the column based on cells of span up to N-1
auto cell_max_contribution = rows_or_columns[rc_index].max_size;
// and the product of:
// - the ratio of the max-content size based on cells of span up to N-1 of the column to the baseline max-content size
// - the outer max-content size of the cell minus the baseline max-content size and the baseline border spacing, or 0 if this is negative
cell_max_contribution += (rows_or_columns[rc_index].max_size / baseline_max_content_size)
* max(CSSPixels(0), cell_max_size<RowOrColumn>(cell) - baseline_max_content_size - baseline_border_spacing);
cell_min_contributions_by_rc_index[rc_index].append(cell_min_contribution);
cell_max_contributions_by_rc_index[rc_index].append(cell_max_contribution);
}