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LibWeb: Add box-shadow rendering

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This patch adds the box-shadow rendering to Boxes. We do parse the
blur-radius of a box-shadow but we don't use it for now as the Filter
in the system don't seem quite powerful enough yet to handle that.
This commit is contained in:
Tobias Christiansen 2021-07-23 21:31:31 +02:00 • committed by Andreas Kling
parent 281689e1fa
commit 5471c87246
2 changed files with 31 additions and 1 deletions
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31
Userland/Libraries/LibWeb/Layout/Box.cpp
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@ -4,6 +4,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/DisjointRectSet.h>
#include <LibGfx/Painter.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/HTMLBodyElement.h>
@ -27,8 +28,8 @@ void Box::paint(PaintContext& context, PaintPhase phase)
auto padded_rect = this->padded_rect();
if (phase == PaintPhase::Background) {
paint_background(context);
paint_box_shadow(context);
}
if (phase == PaintPhase::Border) {
@ -253,6 +254,33 @@ void Box::paint_background_image(
context.painter().blit_tiled(background_rect, background_image, background_image.rect());
}
void Box::paint_box_shadow(PaintContext& context)
{
// FIXME: Implement support for blurring the shadow.
auto box_shadow_data = computed_values().box_shadow();
if (!box_shadow_data.has_value())
return;
auto offset_x_px = box_shadow_data->offset_x.resolved_or_zero(*this, width()).to_px(*this);
auto offset_y_px = box_shadow_data->offset_y.resolved_or_zero(*this, width()).to_px(*this);
Gfx::IntRect shifted_box_rect = {
bordered_rect().x() + offset_x_px,
bordered_rect().y() + offset_y_px,
bordered_rect().width(),
bordered_rect().height()
};
Gfx::DisjointRectSet rect_set;
rect_set.add(shifted_box_rect);
auto shattered = rect_set.shatter(enclosing_int_rect(bordered_rect()));
for (auto& rect : shattered.rects()) {
context.painter().fill_rect(rect, box_shadow_data->color);
(void)rect;
}
}
Box::BorderRadiusData Box::normalized_border_radius_data()
{
// FIXME: some values should be relative to the height() if specified, but which? For now, all relative values are relative to the width.
@ -376,4 +404,5 @@ float Box::width_of_logical_containing_block() const
VERIFY(containing_block);
return containing_block->width();
}
}