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https://github.com/RGBCube/serenity
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LibPDF: Add initial support for Type1 fonts
This is enough to get a char code -> code point mapping
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parent
8441fa2bc4
commit
0624472768
4 changed files with 133 additions and 0 deletions
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@ -4,6 +4,7 @@ set(SOURCES
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Document.cpp
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Encoding.cpp
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Filter.cpp
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Fonts.cpp
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ObjectDerivatives.cpp
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Parser.cpp
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Renderer.cpp
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@ -36,11 +36,13 @@
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V(DeviceRGB) \
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V(Differences) \
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V(E) \
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V(Encoding) \
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V(ExtGState) \
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V(F) \
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V(FL) \
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V(Filter) \
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V(First) \
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V(FirstChar) \
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V(Fit) \
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V(FitB) \
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V(FitBH) \
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@ -50,6 +52,11 @@
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V(FitV) \
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V(FlateDecode) \
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V(Font) \
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V(FontDescriptor) \
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V(FontFamily) \
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V(FontFile1) \
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V(FontFile2) \
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V(FontFile3) \
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V(Gamma) \
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V(H) \
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V(HT) \
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@ -63,6 +70,7 @@
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V(LW) \
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V(LZWDecode) \
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V(Last) \
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V(LastChar) \
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V(Length) \
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V(Linearized) \
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V(ML) \
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@ -87,16 +95,19 @@
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V(SA) \
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V(SM) \
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V(SMask) \
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V(Subtype) \
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V(T) \
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V(TK) \
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V(TR) \
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V(TR2) \
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V(Title) \
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V(ToUnicode) \
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V(Type) \
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V(UCR) \
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V(UseBlackPTComp) \
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V(UserUnit) \
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V(WhitePoint) \
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V(Widths) \
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V(XYZ) \
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V(ca) \
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V(op)
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84
Userland/Libraries/LibPDF/Fonts.cpp
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84
Userland/Libraries/LibPDF/Fonts.cpp
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@ -0,0 +1,84 @@
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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.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<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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TODO();
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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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return adopt_ref(*new Type1Font(to_unicode, encoding.release_nonnull()));
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}
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Type1Font::Type1Font(RefPtr<StreamObject> to_unicode, NonnullRefPtr<Encoding> encoding)
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: m_to_unicode(to_unicode)
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, m_encoding(encoding)
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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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}
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37
Userland/Libraries/LibPDF/Fonts.h
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37
Userland/Libraries/LibPDF/Fonts.h
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@ -0,0 +1,37 @@
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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/ObjectDerivatives.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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};
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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>);
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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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private:
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RefPtr<StreamObject> m_to_unicode;
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NonnullRefPtr<Encoding> m_encoding;
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};
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}
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