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LibPDF: Parse outline structures
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parent
777c232e16
commit
a08922d2f6
3 changed files with 257 additions and 2 deletions
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@ -9,6 +9,30 @@
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namespace PDF {
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String OutlineItem::to_string(int indent) const
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{
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auto indent_str = String::repeated(" ", indent + 1);
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StringBuilder child_builder;
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child_builder.append('[');
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for (auto& child : children)
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child_builder.appendff("{}\n", child.to_string(indent + 1));
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child_builder.appendff("{}]", indent_str);
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StringBuilder builder;
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builder.append("OutlineItem {{\n");
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builder.appendff("{}title={}\n", indent_str, title);
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builder.appendff("{}count={}\n", indent_str, count);
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builder.appendff("{}dest={}\n", indent_str, dest);
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builder.appendff("{}color={}\n", indent_str, color);
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builder.appendff("{}italic={}\n", indent_str, italic);
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builder.appendff("{}bold={}\n", indent_str, bold);
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builder.appendff("{}children={}\n", indent_str, child_builder.to_string());
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builder.appendff("{}}}", String::repeated(" ", indent));
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return builder.to_string();
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}
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Document::Document(const ReadonlyBytes& bytes)
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: m_parser(Parser({}, bytes))
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{
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@ -22,6 +46,7 @@ Document::Document(const ReadonlyBytes& bytes)
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m_catalog = m_trailer->get_dict(this, "Root");
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build_page_tree();
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build_outline();
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}
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Value Document::get_or_load_value(u32 index)
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@ -153,4 +178,124 @@ void Document::add_page_tree_node_to_page_tree(NonnullRefPtr<DictObject> page_tr
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m_page_object_indices.append(value.as_ref_index());
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}
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void Document::build_outline()
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{
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if (!m_catalog->contains("Outlines"))
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return;
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auto outline_dict = m_catalog->get_dict(this, "Outlines");
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if (!outline_dict->contains("First"))
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return;
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VERIFY(outline_dict->contains("Last"));
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auto first_ref = outline_dict->get_value("First");
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auto last_ref = outline_dict->get_value("Last");
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auto children = build_outline_item_chain(first_ref, last_ref);
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m_outline = adopt_ref(*new OutlineDict());
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m_outline->children = move(children);
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if (outline_dict->contains("Count"))
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m_outline->count = outline_dict->get_value("Count").as_int();
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}
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NonnullRefPtr<OutlineItem> Document::build_outline_item(NonnullRefPtr<DictObject> outline_item_dict)
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{
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auto outline_item = adopt_ref(*new OutlineItem {});
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if (outline_item_dict->contains("First")) {
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VERIFY(outline_item_dict->contains("Last"));
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auto first_ref = outline_item_dict->get_value("First");
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auto last_ref = outline_item_dict->get_value("Last");
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auto children = build_outline_item_chain(first_ref, last_ref);
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outline_item->children = move(children);
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}
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outline_item->title = outline_item_dict->get_string(this, "Title")->string();
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if (outline_item_dict->contains("Count"))
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outline_item->count = outline_item_dict->get_value("Count").as_int();
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if (outline_item_dict->contains("Dest")) {
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auto dest_arr = outline_item_dict->get_array(this, "Dest");
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auto page_ref = dest_arr->at(0);
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auto type_name = dest_arr->get_name_at(this, 1)->name();
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Vector<float> parameters;
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for (size_t i = 2; i < dest_arr->size(); i++)
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parameters.append(dest_arr->at(i).to_float());
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Destination::Type type;
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if (type_name == "XYZ") {
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type = Destination::Type::XYZ;
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} else if (type_name == "Fit") {
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type = Destination::Type::Fit;
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} else if (type_name == "FitH") {
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type = Destination::Type::FitH;
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} else if (type_name == "FitV") {
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type = Destination::Type::FitV;
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} else if (type_name == "FitR") {
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type = Destination::Type::FitR;
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} else if (type_name == "FitB") {
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type = Destination::Type::FitB;
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} else if (type_name == "FitBH") {
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type = Destination::Type::FitBH;
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} else if (type_name == "FitBV") {
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type = Destination::Type::FitBV;
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} else {
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VERIFY_NOT_REACHED();
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}
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outline_item->dest = Destination { type, page_ref, parameters };
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}
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if (outline_item_dict->contains("C")) {
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auto color_array = outline_item_dict->get_array(this, "C");
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auto r = static_cast<int>(255.0f * color_array->at(0).as_float());
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auto g = static_cast<int>(255.0f * color_array->at(1).as_float());
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auto b = static_cast<int>(255.0f * color_array->at(2).as_float());
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outline_item->color = Color(r, g, b);
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}
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if (outline_item_dict->contains("F")) {
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auto bitfield = outline_item_dict->get_value("F").as_int();
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outline_item->italic = bitfield & 0x1;
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outline_item->bold = bitfield & 0x2;
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}
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return outline_item;
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}
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NonnullRefPtrVector<OutlineItem> Document::build_outline_item_chain(const Value& first_ref, const Value& last_ref)
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{
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VERIFY(first_ref.is_ref());
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VERIFY(last_ref.is_ref());
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NonnullRefPtrVector<OutlineItem> children;
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auto first_dict = object_cast<DictObject>(get_or_load_value(first_ref.as_ref_index()).as_object());
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auto first = build_outline_item(first_dict);
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children.append(first);
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auto current_child_dict = first_dict;
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u32 current_child_index = first_ref.as_ref_index();
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while (current_child_dict->contains("Next")) {
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auto next_child_dict_ref = current_child_dict->get_value("Next");
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current_child_index = next_child_dict_ref.as_ref_index();
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auto next_child_dict = object_cast<DictObject>(get_or_load_value(current_child_index).as_object());
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auto next_child = build_outline_item(next_child_dict);
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children.append(next_child);
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current_child_dict = next_child_dict;
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}
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VERIFY(last_ref.as_ref_index() == current_child_index);
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return children;
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}
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}
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