153 lines
4.5 KiB
C++
153 lines
4.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/String.h>
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#include <LibGfx/Forward.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/PixelUnits.h>
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namespace Web::CSS {
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class Length {
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public:
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enum class Type {
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// Font-relative
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Em,
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Rem,
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Ex,
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Ch,
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Lh,
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Rlh,
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// Viewport-relative
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Vw,
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Vh,
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Vmin,
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Vmax,
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// Absolute
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Cm,
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Mm,
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Q,
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In,
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Pt,
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Pc,
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Px,
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// FIXME: Remove auto somehow
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Auto,
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};
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static Optional<Type> unit_from_name(StringView);
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Length(int value, Type type);
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Length(float value, Type type);
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~Length();
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static Length make_auto();
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static Length make_px(CSSPixels value);
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Length percentage_of(Percentage const&) const;
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Length resolved(Layout::Node const& layout_node) const;
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bool is_auto() const { return m_type == Type::Auto; }
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bool is_px() const { return m_type == Type::Px; }
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bool is_absolute() const
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{
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return m_type == Type::Cm
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|| m_type == Type::Mm
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|| m_type == Type::Q
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|| m_type == Type::In
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|| m_type == Type::Pt
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|| m_type == Type::Pc
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|| m_type == Type::Px;
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}
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bool is_relative() const
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{
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return m_type == Type::Em
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|| m_type == Type::Rem
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|| m_type == Type::Ex
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|| m_type == Type::Ch
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|| m_type == Type::Lh
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|| m_type == Type::Rlh
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|| m_type == Type::Vw
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|| m_type == Type::Vh
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|| m_type == Type::Vmin
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|| m_type == Type::Vmax;
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}
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Type type() const { return m_type; }
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float raw_value() const { return m_value; }
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CSSPixels to_px(Layout::Node const&) const;
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ALWAYS_INLINE CSSPixels to_px(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
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{
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if (is_auto())
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return 0;
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if (is_relative())
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return relative_length_to_px(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height);
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return absolute_length_to_px();
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}
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ALWAYS_INLINE CSSPixels absolute_length_to_px() const
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{
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constexpr float inch_pixels = 96.0f;
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constexpr float centimeter_pixels = (inch_pixels / 2.54f);
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switch (m_type) {
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case Type::Cm:
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return m_value * centimeter_pixels; // 1cm = 96px/2.54
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case Type::In:
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return m_value * inch_pixels; // 1in = 2.54 cm = 96px
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case Type::Px:
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return m_value; // 1px = 1/96th of 1in
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case Type::Pt:
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return m_value * ((1.0f / 72.0f) * inch_pixels); // 1pt = 1/72th of 1in
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case Type::Pc:
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return m_value * ((1.0f / 6.0f) * inch_pixels); // 1pc = 1/6th of 1in
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case Type::Mm:
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return m_value * ((1.0f / 10.0f) * centimeter_pixels); // 1mm = 1/10th of 1cm
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case Type::Q:
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return m_value * ((1.0f / 40.0f) * centimeter_pixels); // 1Q = 1/40th of 1cm
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default:
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VERIFY_NOT_REACHED();
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}
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}
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ErrorOr<String> to_string() const;
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bool operator==(Length const& other) const
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{
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return m_type == other.m_type && m_value == other.m_value;
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}
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CSSPixels relative_length_to_px(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const;
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// Returns empty optional if it's already absolute.
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Optional<Length> absolutize(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const;
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Length absolutized(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const;
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private:
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char const* unit_name() const;
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Type m_type;
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float m_value { 0 };
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};
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}
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template<>
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struct AK::Formatter<Web::CSS::Length> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, Web::CSS::Length const& length)
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{
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return Formatter<StringView>::format(builder, TRY(length.to_string()));
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}
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};
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