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LibWeb: Incorporate spread-distance into box-shadow rendering

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We also pass whether the shadow goes inside or outside the element. Only
outer shadows are rendered currently, and inner ones may want to be
handled separately from them, as they will never interfere with each
other.
This commit is contained in:
Sam Atkins 2022-02-08 15:33:27 +00:00 • committed by Andreas Kling
parent 10c6c77b5c
commit 103613a3a9
7 changed files with 27 additions and 12 deletions
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13
Userland/Libraries/LibWeb/Painting/ShadowPainting.cpp
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@ -21,17 +21,20 @@ void paint_box_shadow(PaintContext& context, Gfx::IntRect const& content_rect, V
// Note: Box-shadow layers are ordered front-to-back, so we paint them in reverse
for (int layer_index = box_shadow_layers.size() - 1; layer_index >= 0; layer_index--) {
auto& box_shadow_data = box_shadow_layers[layer_index];
// FIXME: Paint inset shadows.
if (box_shadow_data.placement != BoxShadowPlacement::Outer)
continue;
Gfx::IntRect bitmap_rect = {
0,
0,
content_rect.width() + 4 * box_shadow_data.blur_radius,
content_rect.height() + 4 * box_shadow_data.blur_radius
content_rect.width() + (2 * box_shadow_data.spread_distance) + (4 * box_shadow_data.blur_radius),
content_rect.height() + (2 * box_shadow_data.spread_distance) + (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
content_rect.x() - box_shadow_data.spread_distance - (2 * box_shadow_data.blur_radius) + box_shadow_data.offset_x,
content_rect.y() - box_shadow_data.spread_distance - (2 * box_shadow_data.blur_radius) + box_shadow_data.offset_y
};
if (bitmap_rect.is_empty())
@ -45,7 +48,7 @@ void paint_box_shadow(PaintContext& context, Gfx::IntRect const& content_rect, V
auto new_bitmap = bitmap_or_error.release_value_but_fixme_should_propagate_errors();
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);
painter.fill_rect({ { 2 * box_shadow_data.blur_radius, 2 * box_shadow_data.blur_radius }, { content_rect.width() + (2 * box_shadow_data.spread_distance), content_rect.height() + (2 * box_shadow_data.spread_distance) } }, box_shadow_data.color);
Gfx::FastBoxBlurFilter filter(*new_bitmap);
filter.apply_three_passes(box_shadow_data.blur_radius);