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/*
* Copyright (C) 2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "DisplayBoxDecorationData.h"
#include "RenderStyleInlines.h"
namespace WebCore {
namespace Display {
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(BoxDecorationData);
BorderEdge::BorderEdge(float width, float innerWidth, float outerWidth, Color color, BorderStyle style, bool isTransparent, bool isPresent)
: m_color(color)
, m_width(width)
, m_innerWidth(innerWidth)
, m_outerWidth(outerWidth)
, m_style(style)
, m_isTransparent(isTransparent)
, m_isPresent(isPresent)
{
}
bool BorderEdge::obscuresBackground() const
{
if (!m_isPresent || m_isTransparent || !m_color.isOpaque() || m_style == BorderStyle::Hidden)
return false;
if (m_style == BorderStyle::Dotted || m_style == BorderStyle::Dashed || m_style == BorderStyle::Double)
return false;
return true;
}
bool BorderEdge::obscuresBackgroundEdge(float scale) const
{
if (!m_isPresent || m_isTransparent || (m_width * scale) < floorToDevicePixel(2, scale) || !m_color.isOpaque() || m_style == BorderStyle::Hidden)
return false;
if (m_style == BorderStyle::Dotted || m_style == BorderStyle::Dashed)
return false;
if (m_style == BorderStyle::Double)
return m_width >= scale * floorToDevicePixel(5, scale); // The outer band needs to be >= 2px wide at unit scale.
return true;
}
RectEdges<BorderEdge> calculateBorderEdges(const RenderStyle& style, float pixelSnappingFactor, bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
{
bool horizontal = style.isHorizontalWritingMode();
auto constructBorderEdge = [&](float width, CSSPropertyID colorProperty, BorderStyle borderStyle, bool isTransparent, bool isPresent) ->BorderEdge {
float innerWidth = 0.f;
float outerWidth = 0.f;
if (borderStyle == BorderStyle::Double) {
if (borderStyle == BorderStyle::Double && width < floorToDevicePixel(3, pixelSnappingFactor))
borderStyle = BorderStyle::Solid;
else {
innerWidth = ceilToDevicePixel(width * 2 / 3, pixelSnappingFactor);
outerWidth = floorToDevicePixel(width / 3, pixelSnappingFactor);
}
}
float snappedWidth = floorToDevicePixel(width, pixelSnappingFactor);
return { snappedWidth, innerWidth, outerWidth, style.visitedDependentColorWithColorFilter(colorProperty), borderStyle, isTransparent, isPresent };
};
return {
constructBorderEdge(style.borderTopWidth(), CSSPropertyBorderTopColor, style.borderTopStyle(), style.borderTopIsTransparent(), !horizontal || includeLogicalRightEdge),
constructBorderEdge(style.borderRightWidth(), CSSPropertyBorderRightColor, style.borderRightStyle(), style.borderRightIsTransparent(), !horizontal || includeLogicalRightEdge),
constructBorderEdge(style.borderBottomWidth(), CSSPropertyBorderBottomColor, style.borderBottomStyle(), style.borderBottomIsTransparent(), horizontal || includeLogicalRightEdge),
constructBorderEdge(style.borderLeftWidth(), CSSPropertyBorderLeftColor, style.borderLeftStyle(), style.borderLeftIsTransparent(), !horizontal || includeLogicalLeftEdge)
};
}
std::pair<BoxSide, BoxSide> adjacentSidesForSide(BoxSide side)
{
switch (side) {
case BoxSide::Top: return { BoxSide::Left, BoxSide::Right };
case BoxSide::Bottom: return { BoxSide::Left, BoxSide::Right };
case BoxSide::Left: return { BoxSide::Top, BoxSide::Bottom };
case BoxSide::Right: return { BoxSide::Top, BoxSide::Bottom };
}
return { BoxSide::Left, BoxSide::Right };
}
BoxDecorationData::BoxDecorationData() = default;
bool BoxDecorationData::hasBorder() const
{
// FIXME: There's a tricky interaction between borders and border-image here: webkit.org/b/217900.
if (hasBorderImage())
return true;
for (auto side : allBoxSides) {
auto& edge = m_borderEdges[side];
if (edge.style() != BorderStyle::None && edge.width())
return true;
}
return false;
}
bool BoxDecorationData::borderObscuresBackground() const
{
if (!hasBorder())
return false;
// Bail if we have any border-image for now. We could look at the image alpha to improve this.
// FIXME: Check border-image.
for (auto side : allBoxSides) {
if (!m_borderEdges.at(side).obscuresBackground())
return false;
}
return true;
}
bool BoxDecorationData::borderObscuresBackgroundEdge(const FloatSize& contextScale) const
{
for (auto side : allBoxSides) {
auto& currEdge = m_borderEdges.at(side);
// FIXME: for vertical text
float axisScale = (side == BoxSide::Top || side == BoxSide::Bottom) ? contextScale.height() : contextScale.width();
if (!currEdge.obscuresBackgroundEdge(axisScale))
return false;
}
return true;
}
} // namespace Display
} // namespace WebCore
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