RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-06-01 08:18:12 +00:00
Code Issues Activity Actions

LibWeb: Move box-shadow painting out of Box to its own file

Browse source 
This makes the code accessible to things that aren't a Box, such as
InlineNode.
This commit is contained in:
Sam Atkins 2021-09-19 15:00:47 +01:00 • committed by Andreas Kling
parent 3b6325e787
commit b047c1bc97
4 changed files with 83 additions and 37 deletions
Download patch file Download diff file Expand all files Collapse all files

53
Userland/Libraries/LibWeb/Painting/ShadowPainting.cpp Normal file
View file

@ -0,0 +1,53 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/DisjointRectSet.h>
#include <LibGfx/Filters/FastBoxBlurFilter.h>
#include <LibGfx/Painter.h>
#include <LibWeb/Painting/PaintContext.h>
#include <LibWeb/Painting/ShadowPainting.h>
namespace Web::Painting {
void paint_box_shadow(PaintContext& context, Gfx::IntRect const& content_rect, BoxShadowData const& box_shadow_data)
{
Gfx::IntRect bitmap_rect = {
0,
0,
content_rect.width() + 4 * box_shadow_data.blur_radius,
content_rect.height() + 4 * box_shadow_data.blur_radius
};
Gfx::IntPoint blur_rect_position = {
content_rect.x() - 2 * box_shadow_data.blur_radius + box_shadow_data.offset_x,
content_rect.y() - 2 * box_shadow_data.blur_radius + box_shadow_data.offset_y
};
if (bitmap_rect.is_empty())
return;
auto new_bitmap = Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, bitmap_rect.size());
if (!new_bitmap) {
dbgln("Unable to allocate temporary bitmap for box-shadow rendering");
return;
}
Gfx::Painter painter(*new_bitmap);
painter.fill_rect({ { 2 * box_shadow_data.blur_radius, 2 * box_shadow_data.blur_radius }, content_rect.size() }, box_shadow_data.color);
Gfx::FastBoxBlurFilter filter(*new_bitmap);
filter.apply_three_passes(box_shadow_data.blur_radius);
Gfx::DisjointRectSet rect_set;
rect_set.add(bitmap_rect);
auto shattered = rect_set.shatter({ content_rect.location() - blur_rect_position, content_rect.size() });
for (auto& rect : shattered.rects())
context.painter().blit(rect.location() + blur_rect_position, *new_bitmap, rect);
}
}