| /* |
| * 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" |
| |
| #if ENABLE(LAYOUT_FORMATTING_CONTEXT) |
| |
| #include "RenderStyle.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 |
| |
| #endif // ENABLE(LAYOUT_FORMATTING_CONTEXT) |