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