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LibWeb: Add blurring support to box-shadow

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Now the box-shadow-rendering is done by using the new
Gfx::FastBoxBlurFilter. :^)
This commit is contained in:
Tobias Christiansen 2021-07-25 00:39:37 +02:00 • committed by Linus Groh
parent d1844e424d
commit 5745e8e18c
1 changed files with 29 additions and 15 deletions
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44
Userland/Libraries/LibWeb/Layout/Box.cpp
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@ -5,6 +5,8 @@
*/
#include <LibGfx/DisjointRectSet.h>
#include <LibGfx/Filters/FastBoxBlurFilter.h>
#include <LibGfx/Filters/SpatialGaussianBlurFilter.h>
#include <LibGfx/Painter.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/HTMLBodyElement.h>
@ -256,29 +258,41 @@ void Box::paint_background_image(
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);
auto enclosed_int_rect = enclosing_int_rect(bordered_rect());
Gfx::IntRect shifted_box_rect = {
bordered_rect().x() + offset_x_px,
bordered_rect().y() + offset_y_px,
bordered_rect().width(),
bordered_rect().height()
auto offset_x_px = (int)box_shadow_data->offset_x.resolved_or_zero(*this, width()).to_px(*this);
auto offset_y_px = (int)box_shadow_data->offset_y.resolved_or_zero(*this, width()).to_px(*this);
auto blur_radius = (int)box_shadow_data->blur_radius.resolved_or_zero(*this, width()).to_px(*this);
Gfx::IntRect bitmap_rect = {
0,
0,
enclosed_int_rect.width() + 4 * blur_radius,
enclosed_int_rect.height() + 4 * blur_radius
};
Gfx::DisjointRectSet rect_set;
rect_set.add(shifted_box_rect);
auto shattered = rect_set.shatter(enclosing_int_rect(bordered_rect()));
Gfx::IntPoint blur_rect_position = {
enclosed_int_rect.x() - 2 * blur_radius + offset_x_px,
enclosed_int_rect.y() - 2 * blur_radius + offset_y_px
};
for (auto& rect : shattered.rects()) {
context.painter().fill_rect(rect, box_shadow_data->color);
(void)rect;
}
auto new_bitmap = Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, bitmap_rect.size());
Gfx::Painter painter(*new_bitmap);
painter.fill_rect({ { 2 * blur_radius, 2 * blur_radius }, enclosed_int_rect.size() }, box_shadow_data->color);
Gfx::FastBoxBlurFilter filter(*new_bitmap);
filter.apply_three_passes(blur_radius);
Gfx::DisjointRectSet rect_set;
rect_set.add(bitmap_rect);
auto shattered = rect_set.shatter({ enclosed_int_rect.location() - blur_rect_position, enclosed_int_rect.size() });
for (auto& rect : shattered.rects())
context.painter().blit(rect.location() + blur_rect_position, *new_bitmap, rect);
}
Box::BorderRadiusData Box::normalized_border_radius_data()