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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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18
Userland/Libraries/LibWeb/Layout/LineBoxFragment.cpp
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@ -51,7 +51,7 @@ int LineBoxFragment::text_index_at(CSSPixels x) const
Utf8View view(text());
CSSPixels relative_x = x - absolute_x();
float glyph_spacing = font.glyph_spacing();
CSSPixels glyph_spacing = CSSPixels(font.glyph_spacing());
if (relative_x < 0)
return 0;
@ -59,9 +59,9 @@ int LineBoxFragment::text_index_at(CSSPixels x) const
CSSPixels width_so_far = 0;
for (auto it = view.begin(); it != view.end(); ++it) {
auto previous_it = it;
CSSPixels glyph_width = font.glyph_or_emoji_width(it);
CSSPixels glyph_width = CSSPixels(font.glyph_or_emoji_width(it));
if ((width_so_far + (glyph_width + glyph_spacing) / 2) > relative_x)
if ((width_so_far + glyph_width + glyph_spacing / 2) > relative_x)
return m_start + view.byte_offset_of(previous_it);
width_so_far += glyph_width + glyph_spacing;
@ -105,8 +105,8 @@ CSSPixelRect LineBoxFragment::selection_rect(Gfx::Font const& font) const
auto selection_start_in_this_fragment = max(0, range->start_offset() - m_start);
auto selection_end_in_this_fragment = min(m_length, range->end_offset() - m_start);
auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));
auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1;
auto pixel_distance_to_first_selected_character = CSSPixels(font.width(text.substring_view(0, selection_start_in_this_fragment)));
auto pixel_width_of_selection = CSSPixels(font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment))) + 1;
auto rect = absolute_rect();
rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
@ -121,8 +121,8 @@ CSSPixelRect LineBoxFragment::selection_rect(Gfx::Font const& font) const
auto selection_start_in_this_fragment = max(0, range->start_offset() - m_start);
auto selection_end_in_this_fragment = m_length;
auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));
auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1;
auto pixel_distance_to_first_selected_character = CSSPixels(font.width(text.substring_view(0, selection_start_in_this_fragment)));
auto pixel_width_of_selection = CSSPixels(font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment))) + 1;
auto rect = absolute_rect();
rect.set_x(rect.x() + pixel_distance_to_first_selected_character);
@ -137,8 +137,8 @@ CSSPixelRect LineBoxFragment::selection_rect(Gfx::Font const& font) const
auto selection_start_in_this_fragment = 0;
auto selection_end_in_this_fragment = min(range->end_offset() - m_start, m_length);
auto pixel_distance_to_first_selected_character = font.width(text.substring_view(0, selection_start_in_this_fragment));
auto pixel_width_of_selection = font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment)) + 1;
auto pixel_distance_to_first_selected_character = CSSPixels(font.width(text.substring_view(0, selection_start_in_this_fragment)));
auto pixel_width_of_selection = CSSPixels(font.width(text.substring_view(selection_start_in_this_fragment, selection_end_in_this_fragment - selection_start_in_this_fragment))) + 1;
auto rect = absolute_rect();
rect.set_x(rect.x() + pixel_distance_to_first_selected_character);