360c0eb509
In general it is not safe to convert any arbitrary floating-point value to CSSPixels. CSSPixels has a resolution of 0.015625, which for small values (e.g. scale factors between 0 and 1), can produce bad results if converted to CSSPixels then scaled back up. In the worst case values can underflow to zero and produce incorrect results.
39 lines
1.9 KiB
C++
39 lines
1.9 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
|
|
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
|
|
* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include "EdgeRect.h"
|
|
|
|
namespace Web::CSS {
|
|
|
|
// https://www.w3.org/TR/CSS2/visufx.html#value-def-shape
|
|
Gfx::FloatRect EdgeRect::resolved(Layout::Node const& layout_node, Gfx::Rect<double> border_box) const
|
|
{
|
|
// In CSS 2.1, the only valid <shape> value is: rect(<top>, <right>, <bottom>, <left>) where
|
|
// <top> and <bottom> specify offsets from the top border edge of the box, and <right>, and
|
|
// <left> specify offsets from the left border edge of the box.
|
|
|
|
// The value 'auto' means that a given edge of the clipping region will be the same as the edge
|
|
// of the element's generated border box (i.e., 'auto' means the same as '0' for <top> and
|
|
// <left>, the same as the used value of the height plus the sum of vertical padding and border
|
|
// widths for <bottom>, and the same as the used value of the width plus the sum of the
|
|
// horizontal padding and border widths for <right>, such that four 'auto' values result in the
|
|
// clipping region being the same as the element's border box).
|
|
auto left = border_box.left() + (left_edge.is_auto() ? 0 : left_edge.to_px(layout_node).to_double());
|
|
auto top = border_box.top() + (top_edge.is_auto() ? 0 : top_edge.to_px(layout_node).to_double());
|
|
auto right = border_box.left() + (right_edge.is_auto() ? border_box.width() : right_edge.to_px(layout_node).to_double());
|
|
auto bottom = border_box.top() + (bottom_edge.is_auto() ? border_box.height() : bottom_edge.to_px(layout_node).to_double());
|
|
return Gfx::FloatRect {
|
|
left,
|
|
top,
|
|
right - left,
|
|
bottom - top
|
|
};
|
|
}
|
|
|
|
}
|