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LibPDF: Parse outline structures

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This commit is contained in:
Matthew Olsson 2021-05-23 16:37:33 -07:00 • committed by Ali Mohammad Pur
parent 777c232e16
commit a08922d2f6
3 changed files with 257 additions and 2 deletions
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111
Userland/Libraries/LibPDF/Document.h
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@ -9,6 +9,7 @@
#include <AK/Format.h>
#include <AK/HashMap.h>
#include <AK/RefCounted.h>
#include <LibGfx/Color.h>
#include <LibPDF/Object.h>
#include <LibPDF/Parser.h>
#include <LibPDF/XRefTable.h>
@ -31,13 +32,52 @@ struct Page {
int rotate;
};
struct Destination {
enum class Type {
XYZ,
Fit,
FitH,
FitV,
FitR,
FitB,
FitBH,
FitBV,
};
Type type;
Value page;
Vector<float> parameters;
};
struct OutlineItem final : public RefCounted<OutlineItem> {
RefPtr<OutlineItem> parent;
NonnullRefPtrVector<OutlineItem> children;
String title;
i32 count { 0 };
Destination dest;
Gfx::Color color { Color::NamedColor::Black }; // 'C' in the PDF spec
bool italic { false }; // bit 0 of 'F' in the PDF spec
bool bold { false }; // bit 0 of 'F' in the PDF spec
OutlineItem() = default;
String to_string(int indent) const;
};
struct OutlineDict final : public RefCounted<OutlineDict> {
NonnullRefPtrVector<OutlineItem> children;
u32 count { 0 };
OutlineDict() = default;
};
class Document final : public RefCounted<Document> {
public:
explicit Document(const ReadonlyBytes& bytes);
ALWAYS_INLINE const XRefTable& xref_table() const { return m_xref_table; }
ALWAYS_INLINE const DictObject& trailer() const { return *m_trailer; }
ALWAYS_INLINE const RefPtr<OutlineDict>& outline() const { return m_outline; }
[[nodiscard]] Value get_or_load_value(u32 index);
@ -92,6 +132,10 @@ private:
void build_page_tree();
void add_page_tree_node_to_page_tree(NonnullRefPtr<DictObject> page_tree);
void build_outline();
NonnullRefPtr<OutlineItem> build_outline_item(NonnullRefPtr<DictObject> outline_item_dict);
NonnullRefPtrVector<OutlineItem> build_outline_item_chain(const Value& first_ref, const Value& last_ref);
Parser m_parser;
XRefTable m_xref_table;
RefPtr<DictObject> m_trailer;
@ -99,6 +143,7 @@ private:
Vector<u32> m_page_object_indices;
HashMap<u32, Page> m_pages;
HashMap<u32, Value> m_values;
RefPtr<OutlineDict> m_outline;
};
}
@ -134,4 +179,68 @@ struct Formatter<PDF::Page> : Formatter<StringView> {
}
};
template<>
struct Formatter<PDF::Destination> : Formatter<StringView> {
void format(FormatBuilder& builder, const PDF::Destination& destination)
{
String type_str;
switch (destination.type) {
case PDF::Destination::Type::XYZ:
type_str = "XYZ";
break;
case PDF::Destination::Type::Fit:
type_str = "Fit";
break;
case PDF::Destination::Type::FitH:
type_str = "FitH";
break;
case PDF::Destination::Type::FitV:
type_str = "FitV";
break;
case PDF::Destination::Type::FitR:
type_str = "FitR";
break;
case PDF::Destination::Type::FitB:
type_str = "FitB";
break;
case PDF::Destination::Type::FitBH:
type_str = "FitBH";
break;
case PDF::Destination::Type::FitBV:
type_str = "FitBV";
break;
}
StringBuilder param_builder;
for (auto& param : destination.parameters)
param_builder.appendff("{} ", param);
auto str = String::formatted("{{ type={} page={} params={} }}", type_str, destination.page, param_builder.to_string());
Formatter<StringView>::format(builder, str);
}
};
template<>
struct Formatter<PDF::OutlineItem> : Formatter<StringView> {
void format(FormatBuilder& builder, const PDF::OutlineItem& item)
{
Formatter<StringView>::format(builder, item.to_string(0));
}
};
template<>
struct Formatter<PDF::OutlineDict> : Formatter<StringView> {
void format(FormatBuilder& builder, const PDF::OutlineDict& dict)
{
StringBuilder child_builder;
child_builder.append('[');
for (auto& child : dict.children)
child_builder.appendff("{}\n", child.to_string(2));
child_builder.append(" ]");
Formatter<StringView>::format(builder,
String::formatted("OutlineDict {{\n count={}\n children={}\n}}", dict.count, child_builder.to_string()));
}
};
}