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https://github.com/LadybirdBrowser/ladybird.git
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LibPDF: Add very basic support for Adobe Type 1 font rendering
Previously we would draw all text, no matter what font type, as Liberation Serif, which results in things like ugly character spacing. We now have partial support for drawing Type 1 glyphs, which are part of a PostScript font program. We completely ignore hinting for now, which results in ugly looking characters at low resolutions, but gain support for a large number of typefaces, including most of the default fonts used in TeX.
This commit is contained in:
Julian Offenhäuser
Andreas Kling
parent
e6f29302a7
commit
b14f0950a5
Notes:
sideshowbarker
2024-07-17 05:40:58 +09:00
Author: https://github.com/janso3 Commit: https://github.com/SerenityOS/serenity/commit/b14f0950a5 Pull-request: https://github.com/SerenityOS/serenity/pull/15270 Reviewed-by: https://github.com/ADKaster Reviewed-by: https://github.com/gmta Reviewed-by: https://github.com/mattco98
@ -7,6 +7,7 @@ set(SOURCES
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Encryption.cpp
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Filter.cpp
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Fonts/PDFFont.cpp
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Fonts/PS1FontProgram.cpp
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Fonts/TrueTypeFont.cpp
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Fonts/Type0Font.cpp
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Fonts/Type1Font.cpp
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@ -61,7 +61,7 @@
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A(Font) \
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A(FontDescriptor) \
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A(FontFamily) \
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A(FontFile1) \
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A(FontFile) \
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A(FontFile2) \
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A(FontFile3) \
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A(Gamma) \
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@ -82,6 +82,9 @@
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A(Last) \
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A(LastChar) \
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A(Length) \
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A(Length1) \
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A(Length2) \
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A(Length3) \
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A(Linearized) \
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A(ML) \
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A(Matrix) \
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@ -11,6 +11,17 @@
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namespace PDF {
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PDFErrorOr<NonnullRefPtr<Encoding>> Encoding::create(HashMap<u16, CharDescriptor> descriptors)
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{
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auto encoding = adopt_ref(*new Encoding());
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encoding->m_descriptors = descriptors;
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for (auto& descriptor : descriptors)
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encoding->m_name_mapping.set(descriptor.value.name, descriptor.value.code_point);
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return encoding;
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}
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PDFErrorOr<NonnullRefPtr<Encoding>> Encoding::from_object(Document* document, NonnullRefPtr<Object> const& obj)
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{
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if (obj->is<NameObject>()) {
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@ -37,8 +48,9 @@ PDFErrorOr<NonnullRefPtr<Encoding>> Encoding::from_object(Document* document, No
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}
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auto encoding = adopt_ref(*new Encoding());
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for (auto& [code_point, descriptor] : base_encoding->descriptors())
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encoding->m_descriptors.set(code_point, descriptor);
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encoding->m_descriptors = base_encoding->descriptors();
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encoding->m_name_mapping = base_encoding->name_mapping();
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auto differences_array = TRY(dict->get_array(document, CommonNames::Differences));
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@ -632,6 +632,7 @@ struct CharDescriptor {
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class Encoding : public RefCounted<Encoding> {
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public:
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static PDFErrorOr<NonnullRefPtr<Encoding>> create(HashMap<u16, CharDescriptor> descriptors);
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static PDFErrorOr<NonnullRefPtr<Encoding>> from_object(Document*, NonnullRefPtr<Object> const&);
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static NonnullRefPtr<Encoding> standard_encoding();
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@ -642,6 +643,7 @@ public:
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static NonnullRefPtr<Encoding> zapf_encoding();
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HashMap<u16, CharDescriptor> const& descriptors() const { return m_descriptors; }
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HashMap<String, u16> const& name_mapping() const { return m_name_mapping; }
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CharDescriptor const& get_char_code_descriptor(u16 char_code) const;
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599
Userland/Libraries/LibPDF/Fonts/PS1FontProgram.cpp
Normal file
599
Userland/Libraries/LibPDF/Fonts/PS1FontProgram.cpp
Normal file
@ -0,0 +1,599 @@
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/*
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* Copyright (c) 2022, Julian Offenhäuser <offenhaeuser@protonmail.com>
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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/Encoding.h>
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#include <LibPDF/Fonts/PS1FontProgram.h>
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#include <LibPDF/Reader.h>
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#include <ctype.h>
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#include <math.h>
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namespace PDF {
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enum Command {
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HStem = 1,
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VStem = 3,
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VMoveTo,
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RLineTo,
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HLineTo,
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VLineTo,
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RRCurveTo,
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ClosePath,
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CallSubr,
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Return,
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Extended,
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HSbW,
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EndChar,
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RMoveTo = 21,
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HMoveTo,
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VHCurveTo = 30,
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HVCurveTo
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};
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enum ExtendedCommand {
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DotSection,
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VStem3,
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HStem3,
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Div = 12,
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CallOtherSubr = 16,
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Pop,
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SetCurrentPoint = 33,
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};
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PDFErrorOr<void> PS1FontProgram::parse(ReadonlyBytes const& bytes, size_t cleartext_length, size_t encrypted_length)
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{
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Reader reader(bytes);
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if (reader.remaining() == 0)
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return error("Empty font program");
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reader.move_to(0);
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if (reader.remaining() < 2 || !reader.matches("%!"))
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return error("Not a font program");
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if (!seek_name(reader, CommonNames::Encoding))
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return error("Missing encoding array");
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if (TRY(parse_word(reader)) == "StandardEncoding") {
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m_encoding = Encoding::standard_encoding();
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} else {
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HashMap<u16, CharDescriptor> descriptors;
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while (reader.remaining()) {
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auto word = TRY(parse_word(reader));
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if (word == "readonly") {
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break;
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} else if (word == "dup") {
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u32 code_point = TRY(parse_int(reader));
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auto name = TRY(parse_word(reader));
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descriptors.set(code_point, { name.starts_with('/') ? name.substring_view(1) : name.view(), code_point });
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}
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}
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m_encoding = TRY(Encoding::create(descriptors));
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}
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bool found_font_matrix = seek_name(reader, "FontMatrix");
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if (found_font_matrix) {
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auto array = TRY(parse_number_array(reader, 6));
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m_font_matrix = { array[0], array[1], array[2], array[3], array[4], array[5] };
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} else {
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m_font_matrix = { 0.001f, 0.0f, 0.0f, 0.001f, 0.0f, 0.0f };
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}
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auto decrypted = TRY(decrypt(reader.bytes().slice(cleartext_length, encrypted_length), 55665, 4));
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return parse_encrypted_portion(decrypted);
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}
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Gfx::Path PS1FontProgram::build_char(u32 code_point, Gfx::FloatPoint const& point, float width)
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{
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if (!m_glyph_map.contains(code_point))
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return {};
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auto glyph = m_glyph_map.get(code_point).value();
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auto scale = width / (m_font_matrix.a() * glyph.width + m_font_matrix.e());
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auto transform = m_font_matrix;
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// Convert character space to device space.
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transform.scale(scale, -scale);
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transform.set_translation(point);
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return glyph.path.copy_transformed(transform);
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}
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PDFErrorOr<PS1FontProgram::Glyph> PS1FontProgram::parse_glyph(ReadonlyBytes const& data, GlyphParserState& state)
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{
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auto push = [&](float value) -> PDFErrorOr<void> {
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if (state.sp >= state.stack.size())
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return error("Operand stack overflow");
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state.stack[state.sp++] = value;
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return {};
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};
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auto pop = [&]() -> float {
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return state.sp ? state.stack[--state.sp] : 0.0f;
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};
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auto& path = state.glyph.path;
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// Parse the stream of parameters and commands that make up a glyph outline.
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for (size_t i = 0; i < data.size(); ++i) {
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auto require = [&](unsigned num) -> PDFErrorOr<void> {
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if (i + num >= data.size())
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return error("Malformed glyph outline definition");
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return {};
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};
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int v = data[i];
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if (v == 255) {
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TRY(require(4));
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int a = data[++i];
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int b = data[++i];
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int c = data[++i];
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int d = data[++i];
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TRY(push((a << 24) + (b << 16) + (c << 8) + d));
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} else if (v >= 251) {
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TRY(require(1));
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auto w = data[++i];
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TRY(push(-((v - 251) * 256) - w - 108));
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} else if (v >= 247) {
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TRY(require(1));
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auto w = data[++i];
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TRY(push(((v - 247) * 256) + w + 108));
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} else if (v >= 32) {
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TRY(push(v - 139));
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} else {
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// Not a parameter but a command byte.
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switch (v) {
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case HStem:
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case VStem:
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state.sp = 0;
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break;
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case VMoveTo: {
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auto dy = pop();
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state.point.translate_by(0.0f, dy);
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if (state.flex_feature) {
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state.flex_sequence[state.flex_index++] = state.point.x();
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state.flex_sequence[state.flex_index++] = state.point.y();
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} else {
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path.move_to(state.point);
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}
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state.sp = 0;
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break;
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}
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case RLineTo: {
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auto dy = pop();
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auto dx = pop();
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state.point.translate_by(dx, dy);
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path.line_to(state.point);
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state.sp = 0;
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break;
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}
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case HLineTo: {
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auto dx = pop();
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state.point.translate_by(dx, 0.0f);
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path.line_to(state.point);
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state.sp = 0;
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break;
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}
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case VLineTo: {
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auto dy = pop();
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state.point.translate_by(0.0f, dy);
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path.line_to(state.point);
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state.sp = 0;
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break;
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}
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case RRCurveTo: {
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auto dy3 = pop();
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auto dx3 = pop();
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auto dy2 = pop();
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auto dx2 = pop();
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auto dy1 = pop();
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auto dx1 = pop();
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auto& point = state.point;
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path.cubic_bezier_curve_to(
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point + Gfx::FloatPoint(dx1, dy1),
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point + Gfx::FloatPoint(dx1 + dx2, dy1 + dy2),
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point + Gfx::FloatPoint(dx1 + dx2 + dx3, dy1 + dy2 + dy3));
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point.translate_by(dx1 + dx2 + dx3, dy1 + dy2 + dy3);
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state.sp = 0;
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break;
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}
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case ClosePath:
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path.close();
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state.sp = 0;
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break;
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case CallSubr: {
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auto subr_number = pop();
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if (static_cast<size_t>(subr_number) >= m_subroutines.size())
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return error("Subroutine index out of range");
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// Subroutines 0-2 handle the flex feature.
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if (subr_number == 0) {
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if (state.flex_index != 14)
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break;
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auto& flex = state.flex_sequence;
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path.cubic_bezier_curve_to(
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{ flex[2], flex[3] },
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{ flex[4], flex[5] },
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{ flex[6], flex[7] });
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path.cubic_bezier_curve_to(
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{ flex[8], flex[9] },
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{ flex[10], flex[11] },
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{ flex[12], flex[13] });
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state.flex_feature = false;
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state.sp = 0;
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} else if (subr_number == 1) {
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state.flex_feature = true;
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state.flex_index = 0;
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state.sp = 0;
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} else if (subr_number == 2) {
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state.sp = 0;
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} else {
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auto subr = m_subroutines[subr_number];
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if (subr.is_empty())
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return error("Empty subroutine");
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TRY(parse_glyph(subr, state));
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}
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break;
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}
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case Return:
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break;
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case Extended: {
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TRY(require(1));
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switch (data[++i]) {
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case DotSection:
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case VStem3:
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case HStem3:
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// FIXME: Do something with these?
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state.sp = 0;
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break;
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case Div: {
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auto num2 = pop();
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auto num1 = pop();
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TRY(push(num2 ? num1 / num2 : 0.0f));
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break;
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}
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case CallOtherSubr: {
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auto othersubr_number = pop();
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auto n = static_cast<int>(pop());
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if (othersubr_number == 0) {
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state.postscript_stack[state.postscript_sp++] = pop();
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state.postscript_stack[state.postscript_sp++] = pop();
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pop();
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} else if (othersubr_number == 3) {
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state.postscript_stack[state.postscript_sp++] = 3;
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} else {
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for (int i = 0; i < n; ++i)
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state.postscript_stack[state.postscript_sp++] = pop();
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}
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(void)othersubr_number;
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break;
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}
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case Pop:
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TRY(push(state.postscript_stack[--state.postscript_sp]));
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break;
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case SetCurrentPoint: {
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auto y = pop();
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auto x = pop();
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state.point = { x, y };
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path.move_to(state.point);
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state.sp = 0;
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break;
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}
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default:
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return error(String::formatted("Unhandled command: 12 {}", data[i]));
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}
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break;
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}
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case HSbW: {
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auto wx = pop();
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auto sbx = pop();
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state.glyph.width = wx;
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state.point = { sbx, 0.0f };
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state.sp = 0;
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break;
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}
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case EndChar:
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break;
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case RMoveTo: {
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auto dy = pop();
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auto dx = pop();
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state.point.translate_by(dx, dy);
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if (state.flex_feature) {
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state.flex_sequence[state.flex_index++] = state.point.x();
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state.flex_sequence[state.flex_index++] = state.point.y();
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} else {
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path.move_to(state.point);
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}
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state.sp = 0;
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break;
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}
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case HMoveTo: {
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auto dx = pop();
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state.point.translate_by(dx, 0.0f);
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if (state.flex_feature) {
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state.flex_sequence[state.flex_index++] = state.point.x();
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state.flex_sequence[state.flex_index++] = state.point.y();
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} else {
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path.move_to(state.point);
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}
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state.sp = 0;
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break;
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}
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case VHCurveTo: {
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auto dx3 = pop();
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auto dy2 = pop();
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auto dx2 = pop();
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auto dy1 = pop();
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auto& point = state.point;
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path.cubic_bezier_curve_to(
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point + Gfx::FloatPoint(0.0f, dy1),
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point + Gfx::FloatPoint(dx2, dy1 + dy2),
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point + Gfx::FloatPoint(dx2 + dx3, dy1 + dy2));
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point.translate_by(dx2 + dx3, dy1 + dy2);
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state.sp = 0;
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break;
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}
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case HVCurveTo: {
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auto dy3 = pop();
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auto dy2 = pop();
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auto dx2 = pop();
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auto dx1 = pop();
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auto& point = state.point;
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path.cubic_bezier_curve_to(
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point + Gfx::FloatPoint(dx1, 0.0f),
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point + Gfx::FloatPoint(dx1 + dx2, dy2),
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point + Gfx::FloatPoint(dx1 + dx2, dy2 + dy3));
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point.translate_by(dx1 + dx2, dy2 + dy3);
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state.sp = 0;
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break;
|
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}
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|
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default:
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return error(String::formatted("Unhandled command: {}", v));
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}
|
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}
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}
|
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return state.glyph;
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}
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PDFErrorOr<void> PS1FontProgram::parse_encrypted_portion(ByteBuffer const& buffer)
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{
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Reader reader(buffer);
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|
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if (seek_name(reader, "lenIV"))
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m_lenIV = TRY(parse_int(reader));
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if (!seek_name(reader, "Subrs"))
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return error("Missing subroutine array");
|
||||
m_subroutines = TRY(parse_subroutines(reader));
|
||||
|
||||
if (!seek_name(reader, "CharStrings"))
|
||||
return error("Missing char strings array");
|
||||
|
||||
while (reader.remaining()) {
|
||||
auto word = TRY(parse_word(reader));
|
||||
VERIFY(!word.is_empty());
|
||||
|
||||
if (word == "end")
|
||||
break;
|
||||
|
||||
if (word[0] == '/') {
|
||||
auto encrypted_size = TRY(parse_int(reader));
|
||||
auto rd = TRY(parse_word(reader));
|
||||
if (rd == "-|" || rd == "RD") {
|
||||
auto line = TRY(decrypt(reader.bytes().slice(reader.offset(), encrypted_size), m_encryption_key, m_lenIV));
|
||||
reader.move_by(encrypted_size);
|
||||
auto name_mapping = m_encoding->name_mapping();
|
||||
auto code_point = name_mapping.ensure(word.substring_view(1));
|
||||
GlyphParserState state;
|
||||
m_glyph_map.set(code_point, TRY(parse_glyph(line, state)));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return {};
|
||||
}
|
||||
|
||||
PDFErrorOr<Vector<ByteBuffer>> PS1FontProgram::parse_subroutines(Reader& reader)
|
||||
{
|
||||
if (!reader.matches_number())
|
||||
return error("Expected array length");
|
||||
|
||||
auto length = TRY(parse_int(reader));
|
||||
VERIFY(length <= 1024);
|
||||
|
||||
Vector<ByteBuffer> array;
|
||||
TRY(array.try_resize(length));
|
||||
|
||||
while (reader.remaining()) {
|
||||
auto word = TRY(parse_word(reader));
|
||||
if (word.is_empty())
|
||||
VERIFY(0);
|
||||
|
||||
if (word == "dup") {
|
||||
auto index = TRY(parse_int(reader));
|
||||
auto entry = TRY(parse_word(reader));
|
||||
|
||||
if (entry.is_empty())
|
||||
return error("Empty array entry");
|
||||
|
||||
if (index >= length)
|
||||
return error("Array index out of bounds");
|
||||
|
||||
if (isdigit(entry[0])) {
|
||||
auto maybe_encrypted_size = entry.to_int();
|
||||
if (!maybe_encrypted_size.has_value())
|
||||
return error("Malformed array");
|
||||
auto rd = TRY(parse_word(reader));
|
||||
if (rd == "-|" || rd == "RD") {
|
||||
array[index] = TRY(decrypt(reader.bytes().slice(reader.offset(), maybe_encrypted_size.value()), m_encryption_key, m_lenIV));
|
||||
reader.move_by(maybe_encrypted_size.value());
|
||||
}
|
||||
} else {
|
||||
array[index] = TRY(ByteBuffer::copy(entry.bytes()));
|
||||
}
|
||||
} else if (word == "index") {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return array;
|
||||
}
|
||||
|
||||
PDFErrorOr<Vector<float>> PS1FontProgram::parse_number_array(Reader& reader, size_t length)
|
||||
{
|
||||
Vector<float> array;
|
||||
TRY(array.try_resize(length));
|
||||
|
||||
reader.consume_whitespace();
|
||||
|
||||
if (!reader.consume('['))
|
||||
return error("Expected array to start with '['");
|
||||
|
||||
reader.consume_whitespace();
|
||||
|
||||
for (size_t i = 0; i < length; ++i)
|
||||
array.at(i) = TRY(parse_float(reader));
|
||||
|
||||
if (!reader.consume(']'))
|
||||
return error("Expected array to end with ']'");
|
||||
|
||||
return array;
|
||||
}
|
||||
|
||||
PDFErrorOr<String> PS1FontProgram::parse_word(Reader& reader)
|
||||
{
|
||||
reader.consume_whitespace();
|
||||
|
||||
auto start = reader.offset();
|
||||
reader.move_while([&](char c) {
|
||||
return !reader.matches_whitespace() && c != '[' && c != ']';
|
||||
});
|
||||
auto end = reader.offset();
|
||||
|
||||
if (reader.matches_whitespace())
|
||||
reader.consume();
|
||||
|
||||
return StringView(reader.bytes().data() + start, end - start);
|
||||
}
|
||||
|
||||
PDFErrorOr<float> PS1FontProgram::parse_float(Reader& reader)
|
||||
{
|
||||
auto word = TRY(parse_word(reader));
|
||||
return strtof(String(word).characters(), nullptr);
|
||||
}
|
||||
|
||||
PDFErrorOr<int> PS1FontProgram::parse_int(Reader& reader)
|
||||
{
|
||||
auto maybe_int = TRY(parse_word(reader)).to_int();
|
||||
if (!maybe_int.has_value())
|
||||
return error("Invalid int");
|
||||
return maybe_int.value();
|
||||
}
|
||||
|
||||
PDFErrorOr<ByteBuffer> PS1FontProgram::decrypt(ReadonlyBytes const& encrypted, u16 key, size_t skip)
|
||||
{
|
||||
auto decrypted = TRY(ByteBuffer::create_uninitialized(encrypted.size() - skip));
|
||||
|
||||
u16 R = key;
|
||||
u16 c1 = 52845;
|
||||
u16 c2 = 22719;
|
||||
|
||||
for (size_t i = 0; i < encrypted.size(); ++i) {
|
||||
u8 C = encrypted[i];
|
||||
u8 P = C ^ (R >> 8);
|
||||
R = (C + R) * c1 + c2;
|
||||
if (i >= skip)
|
||||
decrypted[i - skip] = P;
|
||||
}
|
||||
|
||||
return decrypted;
|
||||
}
|
||||
|
||||
bool PS1FontProgram::seek_name(Reader& reader, String const& name)
|
||||
{
|
||||
auto start = reader.offset();
|
||||
|
||||
reader.move_to(0);
|
||||
while (reader.remaining()) {
|
||||
if (reader.consume('/') && reader.matches(name.characters())) {
|
||||
// Skip name
|
||||
reader.move_while([&](char) {
|
||||
return reader.matches_regular_character();
|
||||
});
|
||||
reader.consume_whitespace();
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
// Jump back to where we started
|
||||
reader.move_to(start);
|
||||
return false;
|
||||
}
|
||||
|
||||
Error PS1FontProgram::error(
|
||||
String const& message
|
||||
#ifdef PDF_DEBUG
|
||||
,
|
||||
SourceLocation loc
|
||||
#endif
|
||||
)
|
||||
{
|
||||
#ifdef PDF_DEBUG
|
||||
dbgln("\033[31m{} Type 1 font error: {}\033[0m", loc, message);
|
||||
#endif
|
||||
|
||||
return Error { Error::Type::MalformedPDF, message };
|
||||
}
|
||||
}
|
||||
80
Userland/Libraries/LibPDF/Fonts/PS1FontProgram.h
Normal file
80
Userland/Libraries/LibPDF/Fonts/PS1FontProgram.h
Normal file
@ -0,0 +1,80 @@
|
||||
/*
|
||||
* 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> parse(ReadonlyBytes const&, size_t cleartext_length, size_t encrypted_length);
|
||||
|
||||
Gfx::Path build_char(u32 code_point, Gfx::FloatPoint const& point, float width);
|
||||
|
||||
RefPtr<Encoding> encoding() const { return m_encoding; }
|
||||
|
||||
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;
|
||||
};
|
||||
|
||||
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 };
|
||||
};
|
||||
|
||||
}
|
||||
@ -1,9 +1,11 @@
|
||||
/*
|
||||
* Copyright (c) 2022, Matthew Olsson <mattco@serenityos.org>
|
||||
* Copyright (c) 2022, Julian Offenhäuser <offenhaeuser@protonmail.com>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-2-Clause
|
||||
*/
|
||||
|
||||
#include <LibGfx/AntiAliasingPainter.h>
|
||||
#include <LibPDF/CommonNames.h>
|
||||
#include <LibPDF/Fonts/Type1Font.h>
|
||||
|
||||
@ -44,9 +46,8 @@ PDFErrorOr<Type1Font::Data> Type1Font::parse_data(Document* document, NonnullRef
|
||||
if (is_standard_latin_font(base_font)) {
|
||||
// FIXME: The spec doesn't specify what the encoding should be in this case
|
||||
encoding = Encoding::standard_encoding();
|
||||
} else {
|
||||
TODO();
|
||||
}
|
||||
// Otherwise, use the built-in encoding of the font program.
|
||||
}
|
||||
|
||||
RefPtr<StreamObject> to_unicode;
|
||||
@ -67,8 +68,23 @@ PDFErrorOr<Type1Font::Data> Type1Font::parse_data(Document* document, NonnullRef
|
||||
auto descriptor = MUST(dict->get_dict(document, CommonNames::FontDescriptor));
|
||||
if (descriptor->contains(CommonNames::MissingWidth))
|
||||
missing_width = descriptor->get_value(CommonNames::MissingWidth).to_int();
|
||||
if (!descriptor->contains(CommonNames::FontFile))
|
||||
return Type1Font::Data { {}, to_unicode, encoding.release_nonnull(), move(widths), missing_width, true };
|
||||
|
||||
return Type1Font::Data { to_unicode, encoding.release_nonnull(), move(widths), missing_width, false };
|
||||
auto font_file_stream = TRY(descriptor->get_stream(document, CommonNames::FontFile));
|
||||
auto font_file_dict = font_file_stream->dict();
|
||||
|
||||
if (!font_file_dict->contains(CommonNames::Length1, CommonNames::Length2))
|
||||
return Error { Error::Type::Parse, "Embedded type 1 font is incomplete" };
|
||||
|
||||
auto length1 = font_file_dict->get_value(CommonNames::Length1).get<int>();
|
||||
auto length2 = font_file_dict->get_value(CommonNames::Length2).get<int>();
|
||||
|
||||
auto font_program = adopt_ref(*new PS1FontProgram());
|
||||
TRY(font_program->parse(font_file_stream->bytes(), length1, length2));
|
||||
encoding = font_program->encoding();
|
||||
|
||||
return Type1Font::Data { font_program, to_unicode, encoding.release_nonnull(), move(widths), missing_width, false };
|
||||
}
|
||||
|
||||
PDFErrorOr<NonnullRefPtr<Type1Font>> Type1Font::create(Document* document, NonnullRefPtr<DictObject> dict)
|
||||
@ -104,4 +120,13 @@ float Type1Font::get_char_width(u16 char_code, float) const
|
||||
return static_cast<float>(width) / 1000.0f;
|
||||
}
|
||||
|
||||
void Type1Font::draw_glyph(Gfx::Painter& painter, Gfx::IntPoint const& point, float width, u32 code_point, Color color)
|
||||
{
|
||||
// FIXME: Make a glyph cache
|
||||
if (m_data.font_program) {
|
||||
auto path = m_data.font_program->build_char(code_point, { point.x(), point.y() }, width);
|
||||
Gfx::AntiAliasingPainter aa_painter(painter);
|
||||
aa_painter.fill_path(path, color, Gfx::Painter::WindingRule::EvenOdd);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -8,6 +8,7 @@
|
||||
|
||||
#include <LibPDF/Encoding.h>
|
||||
#include <LibPDF/Fonts/PDFFont.h>
|
||||
#include <LibPDF/Fonts/PS1FontProgram.h>
|
||||
|
||||
namespace PDF {
|
||||
|
||||
@ -15,6 +16,7 @@ class Type1Font : public PDFFont {
|
||||
public:
|
||||
// Also used by TrueTypeFont, which is very similar to Type1
|
||||
struct Data {
|
||||
RefPtr<PS1FontProgram> font_program;
|
||||
RefPtr<StreamObject> to_unicode;
|
||||
NonnullRefPtr<Encoding> encoding;
|
||||
HashMap<u16, u16> widths;
|
||||
@ -32,7 +34,7 @@ public:
|
||||
u32 char_code_to_code_point(u16 char_code) const override;
|
||||
float get_char_width(u16 char_code, float font_size) const override;
|
||||
|
||||
void draw_glyph(Gfx::Painter&, Gfx::IntPoint const&, float, u32, Color) override {};
|
||||
void draw_glyph(Gfx::Painter& painter, Gfx::IntPoint const& point, float width, u32 code_point, Color color) override;
|
||||
|
||||
Type type() const override { return PDFFont::Type::Type1; }
|
||||
|
||||
|
||||
@ -643,25 +643,37 @@ void Renderer::show_text(String const& string)
|
||||
{
|
||||
auto& text_rendering_matrix = calculate_text_rendering_matrix();
|
||||
|
||||
auto font_type = text_state().font->type();
|
||||
auto font_size = text_rendering_matrix.x_scale() * text_state().font_size;
|
||||
auto font_size_int = static_cast<int>(text_rendering_matrix.x_scale() * text_state().font_size);
|
||||
auto font = Gfx::FontDatabase::the().get(text_state().font_family, text_state().font_variant, font_size_int);
|
||||
VERIFY(font);
|
||||
|
||||
auto glyph_position = text_rendering_matrix.map(Gfx::FloatPoint { 0.0f, 0.0f });
|
||||
// Account for the reversed font baseline
|
||||
glyph_position.set_y(glyph_position.y() - static_cast<float>(font->baseline()));
|
||||
|
||||
RefPtr<Gfx::Font> font;
|
||||
|
||||
// For types other than Type 1 and the standard 14 fonts, use Liberation Serif for now
|
||||
if (font_type != PDFFont::Type::Type1 || text_state().font->is_standard_font()) {
|
||||
font = Gfx::FontDatabase::the().get(text_state().font_family, text_state().font_variant, font_size);
|
||||
VERIFY(font);
|
||||
|
||||
// Account for the reversed font baseline
|
||||
glyph_position.set_y(glyph_position.y() - static_cast<float>(font->baseline()));
|
||||
}
|
||||
|
||||
auto original_position = glyph_position;
|
||||
|
||||
for (auto char_code : string.bytes()) {
|
||||
auto code_point = text_state().font->char_code_to_code_point(char_code);
|
||||
auto char_width = text_state().font->get_char_width(char_code, font_size);
|
||||
|
||||
if (code_point != 0x20)
|
||||
m_painter.draw_glyph(glyph_position.to_type<int>(), code_point, *font, state().paint_color);
|
||||
|
||||
auto glyph_width = char_width * font_size;
|
||||
|
||||
if (code_point != 0x20) {
|
||||
if (font.is_null()) {
|
||||
text_state().font->draw_glyph(m_painter, glyph_position.to_type<int>(), glyph_width, code_point, state().paint_color);
|
||||
} else {
|
||||
m_painter.draw_glyph(glyph_position.to_type<int>(), code_point, *font, state().paint_color);
|
||||
}
|
||||
}
|
||||
|
||||
auto tx = glyph_width;
|
||||
tx += text_state().character_spacing;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user