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LibWeb: Fix shadow painting when the target painter is translated

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MacDue 2022-09-25 15:44:13 +01:00 • committed by Andreas Kling
parent 3fad64dfbc
commit e3537e4374
1 changed files with 9 additions and 3 deletions
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12
Userland/Libraries/LibWeb/Painting/ShadowPainting.cpp
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@ -6,6 +6,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/NumericLimits.h>
#include <LibGfx/DisjointRectSet.h>
#include <LibGfx/Filters/StackBlurFilter.h>
#include <LibGfx/Painter.h>
@ -281,17 +282,22 @@ void paint_box_shadow(PaintContext& context, Gfx::IntRect const& content_rect, B
// FIXME: Could reduce the shadow paints from 8 to 4 for shadows with all corner radii 50%.
// FIXME: We use this since we want the clip rect to include everything after a certain x or y.
// Note: Using painter.target()->width() or height() does not work, when the painter is a small
// translated bitmap rather than full screen, as the clip rect may not intersect.
constexpr auto really_large_number = NumericLimits<int>::max() / 2;
// Everything above content_rect, including sides
paint_shadow({ 0, 0, painter.target()->width(), content_rect.top() });
paint_shadow({ 0, 0, really_large_number, content_rect.top() });
// Everything below content_rect, including sides
paint_shadow({ 0, content_rect.bottom() + 1, painter.target()->width(), painter.target()->height() });
paint_shadow({ 0, content_rect.bottom() + 1, really_large_number, really_large_number });
// Everything directly to the left of content_rect
paint_shadow({ 0, content_rect.top(), content_rect.left(), content_rect.height() });
// Everything directly to the right of content_rect
paint_shadow({ content_rect.right() + 1, content_rect.top(), painter.target()->width(), content_rect.height() });
paint_shadow({ content_rect.right() + 1, content_rect.top(), really_large_number, content_rect.height() });
if (top_left_corner) {
// Inside the top left corner (the part outside the border radius)