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LibWeb: Add PaintableBox::absolute_paint_rect()

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This method returns the total area this element will paint to.
Currently, this just means accounting for box-shadows, though
there are likely more effects that need to be accounted for here.
This commit is contained in:
MacDue 2022-09-25 15:13:31 +01:00 • committed by Andreas Kling
parent 0843960235
commit 8967fe9d92
2 changed files with 40 additions and 3 deletions
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36
Userland/Libraries/LibWeb/Painting/PaintableBox.cpp
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@ -13,7 +13,6 @@
#include <LibWeb/Painting/BackgroundPainting.h>
#include <LibWeb/Painting/FilterPainting.h>
#include <LibWeb/Painting/PaintableBox.h>
#include <LibWeb/Painting/ShadowPainting.h>
#include <LibWeb/Painting/StackingContext.h>
#include <LibWeb/Platform/FontPlugin.h>
@ -92,6 +91,28 @@ Gfx::FloatRect PaintableBox::absolute_rect() const
return *m_absolute_rect;
}
Gfx::FloatRect PaintableBox::compute_absolute_paint_rect() const
{
// FIXME: This likely incomplete:
auto rect = absolute_border_box_rect();
auto resolved_box_shadow_data = resolve_box_shadow_data();
for (auto const& shadow : resolved_box_shadow_data) {
if (shadow.placement == ShadowPlacement::Inner)
continue;
auto inflate = shadow.spread_distance + shadow.blur_radius;
auto shadow_rect = rect.inflated(inflate, inflate, inflate, inflate).translated(shadow.offset_x, shadow.offset_y);
rect = rect.united(shadow_rect);
}
return rect;
}
Gfx::FloatRect PaintableBox::absolute_paint_rect() const
{
if (!m_absolute_paint_rect.has_value())
m_absolute_paint_rect = compute_absolute_paint_rect();
return *m_absolute_paint_rect;
}
void PaintableBox::set_containing_line_box_fragment(Optional<Layout::LineBoxFragmentCoordinate> fragment_coordinate)
{
m_containing_line_box_fragment = fragment_coordinate;
@ -235,11 +256,11 @@ void PaintableBox::paint_background(PaintContext& context) const
Painting::paint_background(context, layout_box(), background_rect, background_color, computed_values().image_rendering(), background_layers, normalized_border_radii_data());
}
void PaintableBox::paint_box_shadow(PaintContext& context) const
Vector<ShadowData> PaintableBox::resolve_box_shadow_data() const
{
auto box_shadow_data = computed_values().box_shadow();
if (box_shadow_data.is_empty())
return;
return {};
Vector<ShadowData> resolved_box_shadow_data;
resolved_box_shadow_data.ensure_capacity(box_shadow_data.size());
@ -252,6 +273,15 @@ void PaintableBox::paint_box_shadow(PaintContext& context) const
static_cast<int>(layer.spread_distance.to_px(layout_box())),
layer.placement == CSS::ShadowPlacement::Outer ? ShadowPlacement::Outer : ShadowPlacement::Inner);
}
return resolved_box_shadow_data;
}
void PaintableBox::paint_box_shadow(PaintContext& context) const
{
auto resolved_box_shadow_data = resolve_box_shadow_data();
if (resolved_box_shadow_data.is_empty())
return;
Painting::paint_box_shadow(context, absolute_border_box_rect().to_rounded<int>(), normalized_border_radii_data(), resolved_box_shadow_data);
}