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https://github.com/LadybirdBrowser/ladybird.git
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147c3b3d97
Although DistinctNumeric, which is supposed to abstract the underlying type, was used to represent CSSPixels, we have a whole bunch of places in the layout code that assume CSSPixels::value() returns a floating-point type. This assumption makes it difficult to replace the underlying type in CSSPixels with a non-floating type. To make it easier to transition CSSPixels to fixed-point math, one step we can take is to prevent access to the underlying type using value() and instead use explicit conversions with the to_float(), to_double(), and to_int() methods.
118 lines
4.1 KiB
C++
118 lines
4.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
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* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
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* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "LinearGradientStyleValue.h"
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namespace Web::CSS {
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ErrorOr<String> LinearGradientStyleValue::to_string() const
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{
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StringBuilder builder;
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auto side_or_corner_to_string = [](SideOrCorner value) {
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switch (value) {
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case SideOrCorner::Top:
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return "top"sv;
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case SideOrCorner::Bottom:
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return "bottom"sv;
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case SideOrCorner::Left:
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return "left"sv;
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case SideOrCorner::Right:
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return "right"sv;
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case SideOrCorner::TopLeft:
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return "top left"sv;
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case SideOrCorner::TopRight:
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return "top right"sv;
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case SideOrCorner::BottomLeft:
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return "bottom left"sv;
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case SideOrCorner::BottomRight:
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return "bottom right"sv;
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default:
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VERIFY_NOT_REACHED();
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}
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};
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if (m_properties.gradient_type == GradientType::WebKit)
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TRY(builder.try_append("-webkit-"sv));
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if (is_repeating())
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TRY(builder.try_append("repeating-"sv));
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TRY(builder.try_append("linear-gradient("sv));
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TRY(m_properties.direction.visit(
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[&](SideOrCorner side_or_corner) -> ErrorOr<void> {
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return builder.try_appendff("{}{}, "sv, m_properties.gradient_type == GradientType::Standard ? "to "sv : ""sv, side_or_corner_to_string(side_or_corner));
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},
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[&](Angle const& angle) -> ErrorOr<void> {
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return builder.try_appendff("{}, "sv, TRY(angle.to_string()));
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}));
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TRY(serialize_color_stop_list(builder, m_properties.color_stop_list));
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TRY(builder.try_append(")"sv));
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return builder.to_string();
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}
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bool LinearGradientStyleValue::equals(StyleValue const& other_) const
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{
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if (type() != other_.type())
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return false;
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auto& other = other_.as_linear_gradient();
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return m_properties == other.m_properties;
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}
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float LinearGradientStyleValue::angle_degrees(CSSPixelSize gradient_size) const
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{
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auto corner_angle_degrees = [&] {
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return atan2(gradient_size.height().to_double(), gradient_size.width().to_double()) * 180 / AK::Pi<double>;
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};
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return m_properties.direction.visit(
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[&](SideOrCorner side_or_corner) {
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auto angle = [&] {
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switch (side_or_corner) {
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case SideOrCorner::Top:
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return 0.0;
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case SideOrCorner::Bottom:
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return 180.0;
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case SideOrCorner::Left:
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return 270.0;
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case SideOrCorner::Right:
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return 90.0;
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case SideOrCorner::TopRight:
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return corner_angle_degrees();
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case SideOrCorner::BottomLeft:
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return corner_angle_degrees() + 180.0;
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case SideOrCorner::TopLeft:
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return -corner_angle_degrees();
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case SideOrCorner::BottomRight:
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return -(corner_angle_degrees() + 180.0);
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default:
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VERIFY_NOT_REACHED();
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}
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}();
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// Note: For unknowable reasons the angles are opposite on the -webkit- version
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if (m_properties.gradient_type == GradientType::WebKit)
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return angle + 180.0;
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return angle;
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},
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[&](Angle const& angle) {
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return angle.to_degrees();
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});
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}
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void LinearGradientStyleValue::resolve_for_size(Layout::Node const& node, CSSPixelSize size) const
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{
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if (m_resolved.has_value() && m_resolved->size == size)
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return;
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m_resolved = ResolvedData { Painting::resolve_linear_gradient_data(node, size, *this), size };
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}
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void LinearGradientStyleValue::paint(PaintContext& context, DevicePixelRect const& dest_rect, CSS::ImageRendering) const
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{
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VERIFY(m_resolved.has_value());
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Painting::paint_linear_gradient(context, dest_rect, m_resolved->data);
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}
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}
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