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LibWeb: Remove implicit conversion from float and double to CSSPixels

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In general it is not safe to convert any arbitrary floating-point value
to CSSPixels. CSSPixels has a resolution of 0.015625, which for small
values (e.g. scale factors between 0 and 1), can produce bad results
if converted to CSSPixels then scaled back up. In the worst case values
can underflow to zero and produce incorrect results.
This commit is contained in:
MacDue 2023-08-26 15:03:04 +01:00 • committed by Alexander Kalenik
parent 0f9c088302
commit 360c0eb509
43 changed files with 248 additions and 221 deletions
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34
Userland/Libraries/LibWeb/Layout/TableFormattingContext.cpp
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@ -265,11 +265,11 @@ void TableFormattingContext::compute_intrinsic_percentage(size_t max_cell_span)
auto cell_start_rc_index = cell_index<RowOrColumn>(cell);
auto cell_end_rc_index = cell_start_rc_index + cell_span_value;
// 1. Start with the percentage contribution of the cell.
CSSPixels cell_contribution = cell_percentage_contribution<RowOrColumn>(cell);
CSSPixels cell_contribution = CSSPixels(cell_percentage_contribution<RowOrColumn>(cell));
// 2. Subtract the intrinsic percentage width of the column based on cells of span up to N-1 of all columns
// that the cell spans. If this gives a negative result, change it to 0%.
for (auto rc_index = cell_start_rc_index; rc_index < cell_end_rc_index; rc_index++) {
cell_contribution -= rows_or_columns[rc_index].intrinsic_percentage;
cell_contribution -= CSSPixels(rows_or_columns[rc_index].intrinsic_percentage);
cell_contribution = max(cell_contribution, 0);
}
// Compute the sum of the non-spanning max-content sizes of all rows / columns spanned by the cell that have an intrinsic percentage
@ -297,7 +297,7 @@ void TableFormattingContext::compute_intrinsic_percentage(size_t max_cell_span)
// columns spanned by the cell that have an intrinsic percentage width of the column based on cells of span up to N-1 equal to 0%.
CSSPixels ajusted_cell_contribution;
if (width_sum_of_columns_with_zero_intrinsic_percentage != 0) {
ajusted_cell_contribution = cell_contribution * rows_or_columns[rc_index].max_size / static_cast<double>(width_sum_of_columns_with_zero_intrinsic_percentage);
ajusted_cell_contribution = cell_contribution.scaled(rows_or_columns[rc_index].max_size / static_cast<double>(width_sum_of_columns_with_zero_intrinsic_percentage));
} else {
// However, if this ratio is undefined because the denominator is zero, instead use the 1 divided by the number of columns
// spanned by the cell that have an intrinsic percentage width of the column based on cells of span up to N-1 equal to zero.
@ -380,12 +380,12 @@ void TableFormattingContext::compute_table_measures()
auto clamped_diff_to_baseline_min = min(
max(cell_min_size<RowOrColumn>(cell) - baseline_min_content_size - baseline_border_spacing, 0),
baseline_max_content_size - baseline_min_content_size);
cell_min_contribution += normalized_max_min_diff * clamped_diff_to_baseline_min;
cell_min_contribution += CSSPixels(normalized_max_min_diff * clamped_diff_to_baseline_min);
// 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
if (baseline_max_content_size != 0) {
cell_min_contribution += (rows_or_columns[rc_index].max_size / static_cast<double>(baseline_max_content_size))
cell_min_contribution += CSSPixels(rows_or_columns[rc_index].max_size / static_cast<double>(baseline_max_content_size))
* max(CSSPixels(0), cell_min_size<RowOrColumn>(cell) - baseline_max_content_size - baseline_border_spacing);
}
@ -396,7 +396,7 @@ void TableFormattingContext::compute_table_measures()
// - 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
if (baseline_max_content_size != 0) {
cell_max_contribution += (rows_or_columns[rc_index].max_size / static_cast<double>(baseline_max_content_size))
cell_max_contribution += CSSPixels(rows_or_columns[rc_index].max_size / static_cast<double>(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);
@ -461,7 +461,7 @@ void TableFormattingContext::compute_table_width()
// The row/column-grid width minimum (GRIDMIN) width is the sum of the min-content width
// of all the columns plus cell spacing or borders.
CSSPixels grid_min = 0.0f;
CSSPixels grid_min = 0;
for (auto& column : m_columns) {
grid_min += column.min_size;
}
@ -469,7 +469,7 @@ void TableFormattingContext::compute_table_width()
// The row/column-grid width maximum (GRIDMAX) width is the sum of the max-content width
// of all the columns plus cell spacing or borders.
CSSPixels grid_max = 0.0f;
CSSPixels grid_max = 0;
for (auto& column : m_columns) {
grid_max += column.max_size;
}
@ -496,7 +496,7 @@ void TableFormattingContext::compute_table_width()
for (auto& cell : m_cells) {
auto const& cell_width = cell.box->computed_values().width();
if (cell_width.is_percentage()) {
adjusted_used_width = ceil(100 / cell_width.percentage().value() * cell.outer_max_width.to_double());
adjusted_used_width = CSSPixels(ceil(100 / cell_width.percentage().value() * cell.outer_max_width.to_double()));
if (width_of_table_containing_block.is_definite())
used_width = min(max(used_width, adjusted_used_width), width_of_table_containing_block.to_px_or_zero());
else
@ -555,7 +555,7 @@ void TableFormattingContext::assign_columns_width_linear_combination(Vector<CSSP
auto candidate_weight = (available_width - columns_total_used_width) / static_cast<double>(columns_total_candidate_width - columns_total_used_width);
for (size_t i = 0; i < m_columns.size(); ++i) {
auto& column = m_columns[i];
column.used_width = candidate_weight * candidate_widths[i] + (1 - candidate_weight) * column.used_width;
column.used_width = CSSPixels(candidate_weight * candidate_widths[i] + (1 - candidate_weight) * column.used_width);
}
}
@ -576,7 +576,7 @@ bool TableFormattingContext::distribute_excess_width_proportionally_to_base_widt
VERIFY(total_base_width > 0);
for (auto& column : m_columns) {
if (column_filter(column)) {
column.used_width += excess_width * base_width_getter(column) / static_cast<double>(total_base_width);
column.used_width += CSSPixels(excess_width * base_width_getter(column) / static_cast<double>(total_base_width));
}
}
return true;
@ -618,7 +618,7 @@ bool TableFormattingContext::distribute_excess_width_by_intrinsic_percentage(CSS
}
for (auto& column : m_columns) {
if (column_filter(column)) {
column.used_width += excess_width * column.intrinsic_percentage / total_percentage_width;
column.used_width += CSSPixels(excess_width * column.intrinsic_percentage / total_percentage_width);
}
}
return true;
@ -660,7 +660,7 @@ void TableFormattingContext::distribute_width_to_columns()
for (size_t i = 0; i < m_columns.size(); ++i) {
auto& column = m_columns[i];
if (column.has_intrinsic_percentage) {
candidate_widths[i] = max(column.min_size, column.intrinsic_percentage / 100 * available_width);
candidate_widths[i] = max(column.min_size, CSSPixels(column.intrinsic_percentage / 100 * available_width));
}
}
@ -990,7 +990,7 @@ void TableFormattingContext::distribute_height_to_rows()
for (auto& row : m_rows) {
auto weight = row.reference_height / static_cast<double>(sum_reference_height);
auto final_height = m_table_height * weight;
row.final_height = final_height;
row.final_height = CSSPixels(final_height);
}
} else if (rows_with_auto_height.size() > 0) {
// Else, if the table owns any “auto-height” row (a row whose size is only determined by its content size and
@ -1029,7 +1029,7 @@ void TableFormattingContext::position_row_boxes()
for (size_t y = 0; y < m_rows.size(); y++) {
auto& row = m_rows[y];
auto& row_state = m_state.get_mutable(row.box);
CSSPixels row_width = 0.0f;
CSSPixels row_width = 0;
for (auto& column : m_columns) {
row_width += column.used_width;
}
@ -1044,8 +1044,8 @@ void TableFormattingContext::position_row_boxes()
CSSPixels row_group_top_offset = table_state.border_top + table_state.padding_top;
CSSPixels row_group_left_offset = table_state.border_left + table_state.padding_left;
TableGrid::for_each_child_box_matching(table_box(), TableGrid::is_table_row_group, [&](auto& row_group_box) {
CSSPixels row_group_height = 0.0f;
CSSPixels row_group_width = 0.0f;
CSSPixels row_group_height = 0;
CSSPixels row_group_width = 0;
auto& row_group_box_state = m_state.get_mutable(row_group_box);
row_group_box_state.set_content_x(row_group_left_offset);