jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include "Resolution.h"
8#include <LibWeb/CSS/StyleValue.h>
9
10namespace Web::CSS {
11
12Resolution::Resolution(int value, Type type)
13 : m_type(type)
14 , m_value(value)
15{
16}
17
18Resolution::Resolution(float value, Type type)
19 : m_type(type)
20 , m_value(value)
21{
22}
23
24ErrorOr<String> Resolution::to_string() const
25{
26 return String::formatted("{}{}", m_value, unit_name());
27}
28
29float Resolution::to_dots_per_pixel() const
30{
31 switch (m_type) {
32 case Type::Dpi:
33 return m_value * 96; // 1in = 2.54cm = 96px
34 case Type::Dpcm:
35 return m_value * (96.0f / 2.54f); // 1cm = 96px/2.54
36 case Type::Dppx:
37 return m_value;
38 }
39 VERIFY_NOT_REACHED();
40}
41
42StringView Resolution::unit_name() const
43{
44 switch (m_type) {
45 case Type::Dpi:
46 return "dpi"sv;
47 case Type::Dpcm:
48 return "dpcm"sv;
49 case Type::Dppx:
50 return "dppx"sv;
51 }
52 VERIFY_NOT_REACHED();
53}
54
55Optional<Resolution::Type> Resolution::unit_from_name(StringView name)
56{
57 if (name.equals_ignoring_ascii_case("dpi"sv)) {
58 return Type::Dpi;
59 } else if (name.equals_ignoring_ascii_case("dpcm"sv)) {
60 return Type::Dpcm;
61 } else if (name.equals_ignoring_ascii_case("dppx"sv)) {
62 return Type::Dppx;
63 }
64 return {};
65}
66
67}