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LibPDF: Move font files into their own directory
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parent
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commit
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8 changed files with 55 additions and 26 deletions
24
Userland/Libraries/LibPDF/Fonts/PDFFont.cpp
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24
Userland/Libraries/LibPDF/Fonts/PDFFont.cpp
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/*
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* Copyright (c) 2022, Matthew Olsson <mattco@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibPDF/CommonNames.h>
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#include <LibPDF/Fonts/PDFFont.h>
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#include <LibPDF/Fonts/Type1Font.h>
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namespace PDF {
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PDFErrorOr<NonnullRefPtr<PDFFont>> PDFFont::create(Document* document, NonnullRefPtr<DictObject> dict)
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{
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auto subtype = TRY(dict->get_name(document, CommonNames::Subtype))->name();
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if (subtype == "Type1")
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return TRY(Type1Font::create(document, dict));
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dbgln("Unknown font subtype: {}", subtype);
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TODO();
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}
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}
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23
Userland/Libraries/LibPDF/Fonts/PDFFont.h
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Userland/Libraries/LibPDF/Fonts/PDFFont.h
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/*
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* Copyright (c) 2022, Matthew Olsson <mattco@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 <LibPDF/Document.h>
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namespace PDF {
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class PDFFont : public RefCounted<PDFFont> {
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public:
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static PDFErrorOr<NonnullRefPtr<PDFFont>> create(Document*, NonnullRefPtr<DictObject>);
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virtual ~PDFFont() = default;
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virtual u32 char_code_to_code_point(u16 char_code) const = 0;
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virtual float get_char_width(u16 char_code) const = 0;
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};
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}
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103
Userland/Libraries/LibPDF/Fonts/Type1Font.cpp
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Userland/Libraries/LibPDF/Fonts/Type1Font.cpp
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/*
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* Copyright (c) 2022, Matthew Olsson <mattco@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibPDF/CommonNames.h>
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#include <LibPDF/Fonts/Type1Font.h>
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namespace PDF {
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static bool is_standard_latin_font(FlyString const& font)
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{
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return font.is_one_of(
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"Times-Roman",
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"Helvetica",
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"Courier",
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"Times-Bold",
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"Helvetica-Bold",
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"Courier-Bold",
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"Times-Italic",
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"Helvetica-Oblique",
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"Courier-Oblique",
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"Times-BoldItalic",
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"Helvetica-BoldOblique",
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"Courier-BoldOblique");
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}
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PDFErrorOr<NonnullRefPtr<Type1Font>> Type1Font::create(Document* document, NonnullRefPtr<DictObject> dict)
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{
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// FIXME: "Required except for the standard 14 fonts"...
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// "Beginning with PDF 1.5, the special treatment given to the standard 14
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// fonts is deprecated. [...] For backwards capability, conforming readers
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// shall still provide the special treatment identifier for the standard
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// 14 fonts."
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RefPtr<Encoding> encoding;
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if (dict->contains(CommonNames::Encoding)) {
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auto encoding_object = MUST(dict->get_object(document, CommonNames::Encoding));
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encoding = TRY(Encoding::from_object(document, encoding_object));
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} else {
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auto base_font = MUST(dict->get_name(document, CommonNames::BaseFont))->name();
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if (is_standard_latin_font(base_font)) {
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// FIXME: The spec doesn't specify what the encoding should be in this case
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encoding = Encoding::standard_encoding();
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} else {
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TODO();
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}
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}
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RefPtr<StreamObject> to_unicode;
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if (dict->contains(CommonNames::ToUnicode))
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to_unicode = MUST(dict->get_stream(document, CommonNames::ToUnicode));
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auto first_char = dict->get_value(CommonNames::FirstChar).get<int>();
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auto last_char = dict->get_value(CommonNames::LastChar).get<int>();
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auto widths_array = MUST(dict->get_array(document, CommonNames::Widths));
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VERIFY(widths_array->size() == static_cast<size_t>(last_char - first_char + 1));
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HashMap<u16, u16> widths;
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for (size_t i = 0; i < widths_array->size(); i++)
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widths.set(first_char + i, widths_array->at(i).get<int>());
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u16 missing_width = 0;
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auto descriptor = MUST(dict->get_dict(document, CommonNames::FontDescriptor));
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if (descriptor->contains(CommonNames::MissingWidth))
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missing_width = descriptor->get_value(CommonNames::MissingWidth).get<int>();
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return adopt_ref(*new Type1Font(to_unicode, encoding.release_nonnull(), widths, missing_width));
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}
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Type1Font::Type1Font(RefPtr<StreamObject> to_unicode, NonnullRefPtr<Encoding> encoding, HashMap<u16, u16> const& widths, u16 missing_width)
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: m_to_unicode(to_unicode)
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, m_encoding(encoding)
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, m_widths(widths)
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, m_missing_width(missing_width)
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{
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}
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u32 Type1Font::char_code_to_code_point(u16 char_code) const
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{
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if (m_to_unicode)
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TODO();
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auto descriptor = m_encoding->get_char_code_descriptor(char_code);
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return descriptor.code_point;
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}
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float Type1Font::get_char_width(u16 char_code) const
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{
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u16 width;
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if (auto char_code_width = m_widths.get(char_code); char_code_width.has_value()) {
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width = char_code_width.value();
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} else {
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width = m_missing_width;
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}
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return static_cast<float>(width) / 1000.0f;
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}
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}
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31
Userland/Libraries/LibPDF/Fonts/Type1Font.h
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31
Userland/Libraries/LibPDF/Fonts/Type1Font.h
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/*
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* Copyright (c) 2022, Matthew Olsson <mattco@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 <LibPDF/Encoding.h>
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#include <LibPDF/Fonts/PDFFont.h>
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namespace PDF {
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class Type1Font : public PDFFont {
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public:
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static PDFErrorOr<NonnullRefPtr<Type1Font>> create(Document*, NonnullRefPtr<DictObject>);
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Type1Font(RefPtr<StreamObject> to_unicode, NonnullRefPtr<Encoding>, HashMap<u16, u16> const& m_widths, u16 missing_width);
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~Type1Font() override = default;
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u32 char_code_to_code_point(u16 char_code) const override;
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float get_char_width(u16 char_code) const override;
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private:
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RefPtr<StreamObject> m_to_unicode;
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NonnullRefPtr<Encoding> m_encoding;
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HashMap<u16, u16> m_widths;
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u16 m_missing_width;
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};
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}
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