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serenity/Userland/Libraries/LibPDF/Fonts/PS1FontProgram.h
Julian Offenhäuser e06a065594 LibPDF: Override Type 1 character mappings by encoding in font dict
If the font dictionary includes an "Encoding" entry, it will be used
instead of the PS1FontProgram's built-in encoding.
2022-11-25 22:44:47 +01:00

84 lines
2.1 KiB
C++

/*
* Copyright (c) 2022, Julian Offenhäuser <offenhaeuser@protonmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Forward.h>
#include <LibGfx/AffineTransform.h>
#include <LibGfx/Path.h>
#include <LibPDF/Error.h>
namespace PDF {
class Reader;
class Encoding;
class PS1FontProgram : public RefCounted<PS1FontProgram> {
public:
PDFErrorOr<void> create(ReadonlyBytes const&, RefPtr<Encoding>, size_t cleartext_length, size_t encrypted_length);
RefPtr<Gfx::Bitmap> rasterize_glyph(u32 char_code, float width);
Gfx::Path build_char(u32 char_code, float width);
RefPtr<Encoding> encoding() const { return m_encoding; }
Gfx::FloatPoint glyph_translation(u32 char_code, float width) const;
private:
struct Glyph {
Gfx::Path path;
float width;
};
struct GlyphParserState {
Glyph glyph;
Gfx::FloatPoint point;
bool flex_feature { false };
size_t flex_index;
Array<float, 14> flex_sequence;
size_t sp { 0 };
Array<float, 24> stack;
size_t postscript_sp { 0 };
Array<float, 24> postscript_stack;
};
Gfx::AffineTransform glyph_transform_to_device_space(Glyph const&, float width) const;
PDFErrorOr<Glyph> parse_glyph(ReadonlyBytes const&, GlyphParserState&);
PDFErrorOr<void> parse_encrypted_portion(ByteBuffer const&);
PDFErrorOr<Vector<ByteBuffer>> parse_subroutines(Reader&);
PDFErrorOr<Vector<float>> parse_number_array(Reader&, size_t length);
PDFErrorOr<String> parse_word(Reader&);
PDFErrorOr<float> parse_float(Reader&);
PDFErrorOr<int> parse_int(Reader&);
PDFErrorOr<ByteBuffer> decrypt(ReadonlyBytes const&, u16 key, size_t skip);
bool seek_name(Reader&, String const&);
static Error error(
String const& message
#ifdef PDF_DEBUG
,
SourceLocation loc = SourceLocation::current()
#endif
);
Vector<ByteBuffer> m_subroutines;
Vector<ByteBuffer> m_character_names;
HashMap<u16, Glyph> m_glyph_map;
Gfx::AffineTransform m_font_matrix;
RefPtr<Encoding> m_encoding;
u16 m_encryption_key { 4330 };
int m_lenIV { 4 };
};
}