jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2023, Rodrigo Tobar <rtobarc@gmail.com>.
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <LibGfx/Forward.h>
8#include <LibPDF/CommonNames.h>
9#include <LibPDF/Error.h>
10#include <LibPDF/Fonts/PDFFont.h>
11#include <LibPDF/Fonts/SimpleFont.h>
12#include <LibPDF/Fonts/TrueTypeFont.h>
13#include <LibPDF/Fonts/Type1Font.h>
14
15namespace PDF {
16
17PDFErrorOr<void> SimpleFont::initialize(Document* document, NonnullRefPtr<DictObject> const& dict, float font_size)
18{
19 TRY(PDFFont::initialize(document, dict, font_size));
20 if (dict->contains(CommonNames::Encoding)) {
21 auto encoding_object = MUST(dict->get_object(document, CommonNames::Encoding));
22 m_encoding = TRY(Encoding::from_object(document, encoding_object));
23 }
24
25 if (dict->contains(CommonNames::ToUnicode))
26 m_to_unicode = TRY(dict->get_stream(document, CommonNames::ToUnicode));
27
28 if (dict->contains(CommonNames::FirstChar) && dict->contains(CommonNames::LastChar) && dict->contains(CommonNames::Widths)) {
29 auto first_char = dict->get_value(CommonNames::FirstChar).get<int>();
30 auto last_char = dict->get_value(CommonNames::LastChar).get<int>();
31 auto widths_array = TRY(dict->get_array(document, CommonNames::Widths));
32
33 VERIFY(widths_array->size() == static_cast<size_t>(last_char - first_char + 1));
34
35 for (size_t i = 0; i < widths_array->size(); i++)
36 m_widths.set(first_char + i, widths_array->at(i).to_int());
37 }
38
39 if (dict->contains(CommonNames::FontDescriptor)) {
40 auto descriptor = TRY(dict->get_dict(document, CommonNames::FontDescriptor));
41 if (descriptor->contains(CommonNames::MissingWidth))
42 m_missing_width = descriptor->get_value(CommonNames::MissingWidth).to_int();
43 }
44
45 return {};
46}
47
48float SimpleFont::get_char_width(u8 char_code) const
49{
50 return static_cast<float>(m_widths.get(char_code).value_or(m_missing_width)) / 1000.0f;
51}
52
53PDFErrorOr<Gfx::FloatPoint> SimpleFont::draw_string(Gfx::Painter& painter, Gfx::FloatPoint glyph_position, DeprecatedString const& string, Color const& paint_color, float font_size, float character_spacing, float horizontal_scaling)
54{
55 auto so = make_object<StringObject>(string, true);
56 for (auto char_code : string.bytes()) {
57 auto char_width = get_char_width(char_code);
58 auto glyph_width = char_width * font_size;
59 draw_glyph(painter, glyph_position, glyph_width, char_code, paint_color);
60 auto tx = glyph_width;
61 tx += character_spacing;
62 tx *= horizontal_scaling;
63 glyph_position += { tx, 0.0f };
64 }
65 return glyph_position;
66}
67
68}