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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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16
Userland/Libraries/LibWeb/Painting/PaintableBox.cpp
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@ -258,8 +258,8 @@ void PaintableBox::paint(PaintContext& context, PaintPhase phase) const
auto size_text_rect = border_rect;
size_text_rect.set_y(border_rect.y() + border_rect.height());
size_text_rect.set_top(size_text_rect.top());
size_text_rect.set_width((float)font.width(size_text) + 4);
size_text_rect.set_height(font.pixel_size() + 4);
size_text_rect.set_width(CSSPixels(font.width(size_text)) + 4);
size_text_rect.set_height(CSSPixels(font.pixel_size()) + 4);
auto size_text_device_rect = context.enclosing_device_rect(size_text_rect).to_type<int>();
context.painter().fill_rect(size_text_device_rect, context.palette().color(Gfx::ColorRole::Tooltip));
context.painter().draw_rect(size_text_device_rect, context.palette().threed_shadow1());
@ -503,7 +503,7 @@ static void paint_cursor_if_needed(PaintContext& context, Layout::TextNode const
auto fragment_rect = fragment.absolute_rect();
CSSPixelRect cursor_rect {
fragment_rect.x() + text_node.font().width(fragment.text().substring_view(0, text_node.browsing_context().cursor_position().offset() - fragment.start())),
fragment_rect.x() + CSSPixels(text_node.font().width(fragment.text().substring_view(0, text_node.browsing_context().cursor_position().offset() - fragment.start()))),
fragment_rect.top(),
1,
fragment_rect.height()
@ -518,7 +518,7 @@ static void paint_text_decoration(PaintContext& context, Gfx::Painter& painter,
{
auto& font = fragment.layout_node().font();
auto fragment_box = fragment.absolute_rect();
CSSPixels glyph_height = font.pixel_size();
CSSPixels glyph_height = CSSPixels(font.pixel_size());
auto baseline = fragment_box.height() / 2 - (glyph_height + 4) / 2 + glyph_height;
auto line_color = text_node.computed_values().text_decoration_color();
@ -526,9 +526,9 @@ static void paint_text_decoration(PaintContext& context, Gfx::Painter& painter,
CSSPixels css_line_thickness = [&] {
CSS::Length computed_thickness = text_node.computed_values().text_decoration_thickness().resolved(text_node, CSS::Length(1, CSS::Length::Type::Em));
if (computed_thickness.is_auto())
return max(glyph_height * 0.1, 1.);
return max(glyph_height.scaled(0.1), 1);
return computed_thickness.to_px(text_node).to_double();
return computed_thickness.to_px(text_node);
}();
auto device_line_thickness = context.rounded_device_pixels(css_line_thickness);
@ -550,8 +550,8 @@ static void paint_text_decoration(PaintContext& context, Gfx::Painter& painter,
break;
case CSS::TextDecorationLine::LineThrough: {
auto x_height = font.x_height();
line_start_point = context.rounded_device_point(fragment_box.top_left().translated(0, baseline - x_height * 0.5f));
line_end_point = context.rounded_device_point(fragment_box.top_right().translated(-1, baseline - x_height * 0.5f));
line_start_point = context.rounded_device_point(fragment_box.top_left().translated(0, baseline - x_height * CSSPixels(0.5f)));
line_end_point = context.rounded_device_point(fragment_box.top_right().translated(-1, baseline - x_height * CSSPixels(0.5f)));
break;
}
case CSS::TextDecorationLine::Blink: