Aspose::Pdf::PdfASymbolicFontEncodingStrategy Class Reference

This class describes rules which can be used to tune process of copy encoding data for cases when TrueType symbolic font has more than one encoding. Some PDF documents after conversion into PDF/A format could have error "More than one encoding in symbolic TrueType font's cmap". What is a reason of this error? All TrueType symbolic fonts have special table "cmap" in it's internal data. This table maps character codes to glyph indices. And this table could contain different encoding subtables which describe encodings used. See advanced info about cmap tables at https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6cmap.html. Usually cmap table contains several encoding subtables, but PDF/A standard requires that only one encoding subtable (3,0) must be leaved for this font in PDF/A document. And key question here - what data must be taken from another subtables to copy into destination encoding table (3,0)? Majority of fonts have 'well-formed' cmap tables where every encoding subtable is fully consistent with another subtable. But some fonts have cmap tables with collisions - where for example one subtable has glyph index 100 for unicode 100, but another subtable has glyph index 200 for the same unicode 100. To solve this problems special strategy needed. By default following strategy used: mac subtable(1,0) is looked for. If this table is found, only this data used to fill destination table (3,0). If mac subtable is not found then all subtables except (3,0) are iterated and used to copy data into destination (3,0) subtable. Also mapping for every unicode(unicode, glyph index) is copied into destination table only if destination table has no this unicode at current moment. So, for example if first subtabe has glyph index 100 for unicode 100, and next subtable has glyph index 200 for the same unicode 100, only data from first subtable (unicode=100, glyph index = 100) will be copied. So each previous subtable takes precedence over the next. Properties of this class PdfASymbolicFontEncodingStrategy help tune default behaviour. If property PreferredCmapEncodingTable of type QueueItem::CMapEncodingTableType is set, then relevant subtable will be used in precedence to mac subtable(1,0). Value 'MacTable' from enumeration QueueItem::CMapEncodingTableType has no sense in this case, cause it points on the same mac subtable (1,0) which will be used by default. Property CmapEncodingTablesPriorityQueue discards all priorities for any subtable. If this property is set, then only subtables from declared queue will be used in specified order. If subtables specified are not found then default iteration of all subtables and copy strategy described above will be used. Object QueueItem specifies encoding subtable used. This subtable can be set via combination of members(PlatformID, PlatformSpecificID) or via QueueItem::CMapEncodingTableType enumeration. More...

Inherits System::Object.

Classes

class  QueueItem
 

Public Member Functions

PdfASymbolicFontEncodingStrategy::QueueItem::CMapEncodingTableType get_PreferredCmapEncodingTable ()
 Specifies subtable which will be used in precedence to mac subtable(1,0). Value 'MacTable' from enumeration QueueItem::CMapEncodingTableType has no sense in this case. More...
 
void set_PreferredCmapEncodingTable (PdfASymbolicFontEncodingStrategy::QueueItem::CMapEncodingTableType value)
 Specifies subtable which will be used in precedence to mac subtable(1,0). Value 'MacTable' from enumeration QueueItem::CMapEncodingTableType has no sense in this case. More...
 
System::SharedPtr< System::Collections::Generic::Queue< System::SharedPtr< PdfASymbolicFontEncodingStrategy::QueueItem > > > get_CmapEncodingTablesPriorityQueue ()
 Specifies queue of encoding subtables to process. More...
 
void set_CmapEncodingTablesPriorityQueue (System::SharedPtr< System::Collections::Generic::Queue< System::SharedPtr< PdfASymbolicFontEncodingStrategy::QueueItem >>> value)
 Specifies queue of encoding subtables to process. More...
 
 PdfASymbolicFontEncodingStrategy ()
 Constructor. Sets default subtable (mac 1,0) More...
 
 PdfASymbolicFontEncodingStrategy (System::SharedPtr< System::Collections::Generic::Queue< System::SharedPtr< PdfASymbolicFontEncodingStrategy::QueueItem >>> priorityQueue)
 Constructor More...
 
 PdfASymbolicFontEncodingStrategy (PdfASymbolicFontEncodingStrategy::QueueItem::CMapEncodingTableType preferredEncodingTable)
 Constructor More...
 
- Public Member Functions inherited from System::Object
ASPOSECPP_SHARED_API Object ()
 Creates object. Initializes all internal data structures. More...
 
virtual ASPOSECPP_SHARED_API ~Object ()
 Destroys object. Frees all internal data structures. More...
 
ASPOSECPP_SHARED_API Object (Object const &x)
 Copy constructor. Doesn't copy anything, really, just initializes new object and enables copy constructing subclasses. More...
 
Objectoperator= (Object const &x)
 Assignment operator. Doesn't copy anything, really, just initializes new object and enables copy constructing subclasses. More...
 
ObjectSharedRefAdded ()
 Increments shared reference count. Shouldn't be called directly; instead, use smart pointers or ThisProtector. More...
 
int SharedRefRemovedSafe ()
 Decrements and returns shared reference count. Shouldn't be called directly; instead, use smart pointers or ThisProtector. More...
 
int RemovedSharedRefs (int count)
 Decreases shared reference count by specified value. More...
 
Detail::SmartPtrCounter * WeakRefAdded ()
 Increments weak reference count. Shouldn't be called directly; instead, use smart pointers or ThisProtector. More...
 
void WeakRefRemoved ()
 Decrements weak reference count. Shouldn't be called directly; instead, use smart pointers or ThisProtector. More...
 
Detail::SmartPtrCounter * GetCounter ()
 Gets reference counter data structure associated with the object. More...
 
int SharedCount () const
 Gets current value of shared refernce counter. More...
 
ASPOSECPP_SHARED_API void Lock ()
 Implements C# lock() statement locking. Call directly or use LockContext sentry object. More...
 
ASPOSECPP_SHARED_API void Unlock ()
 Implements C# lock() statement unlocking. Call directly or use LockContext sentry object. More...
 
virtual ASPOSECPP_SHARED_API bool Equals (ptr obj)
 Compares objects using C# Object.Equals semantics. More...
 
virtual ASPOSECPP_SHARED_API int GetHashCode () const
 Analog of C# Object.GetHashCode() method. Enables hashing of custom objects. More...
 
virtual ASPOSECPP_SHARED_API String ToString () ASPOSE_CONST
 Analog of C# Object.ToString() method. Enables converting custom objects to string. More...
 
virtual ASPOSECPP_SHARED_API ptr MemberwiseClone () const
 Analog of C# Object.MemberwiseClone() method. Enables cloning custom types. More...
 
virtual ASPOSECPP_SHARED_API const TypeInfoGetType () const
 Gets actual type of object. Analog of C# System.Object.GetType() call. More...
 
virtual ASPOSECPP_SHARED_API bool Is (const TypeInfo &targetType) const
 Check if object represents an instance of type described by targetType. Analog of C# 'is' operator. More...
 
virtual ASPOSECPP_SHARED_API void SetTemplateWeakPtr (unsigned int argument)
 Set n'th template argument a weak pointer (rather than shared). Allows switching pointers in containers to weak mode. More...
 
template<>
bool Equals (float const &objA, float const &objB)
 
template<>
bool Equals (double const &objA, double const &objB)
 
template<>
bool ReferenceEquals (String const &str, std::nullptr_t)
 
template<>
bool ReferenceEquals (String const &str1, String const &str2)
 

Additional Inherited Members

- Public Types inherited from System::Object
typedef SmartPtr< Objectptr
 Alias for smart pointer type. More...
 
typedef System::Details::SharedMembersType shared_members_type
 structure to keep list of shared pointers contained in object. More...
 
- Static Public Member Functions inherited from System::Object
static bool ReferenceEquals (ptr const &objA, ptr const &objB)
 Compares objects by reference. More...
 
template<typename T >
static std::enable_if<!IsSmartPtr< T >::value, bool >::type ReferenceEquals (T const &objA, T const &objB)
 Compares objects by reference. More...
 
template<typename T >
static std::enable_if<!IsSmartPtr< T >::value, bool >::type ReferenceEquals (T const &objA, std::nullptr_t)
 Reference-compares value type object with nullptr. More...
 
template<typename T1 , typename T2 >
static std::enable_if< IsSmartPtr< T1 >::value &&IsSmartPtr< T2 >::value, bool >::type Equals (T1 const &objA, T2 const &objB)
 Compares reference type objects in C# style. More...
 
template<typename T1 , typename T2 >
static std::enable_if<!IsSmartPtr< T1 >::value &&!IsSmartPtr< T2 >::value, bool >::type Equals (T1 const &objA, T2 const &objB)
 Compares value type objects in C# style. More...
 
static const TypeInfoType ()
 Impleemnts C# typeof(System.Object) construct. More...
 

Detailed Description

This class describes rules which can be used to tune process of copy encoding data for cases when TrueType symbolic font has more than one encoding. Some PDF documents after conversion into PDF/A format could have error "More than one encoding in symbolic TrueType font's cmap". What is a reason of this error? All TrueType symbolic fonts have special table "cmap" in it's internal data. This table maps character codes to glyph indices. And this table could contain different encoding subtables which describe encodings used. See advanced info about cmap tables at https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6cmap.html. Usually cmap table contains several encoding subtables, but PDF/A standard requires that only one encoding subtable (3,0) must be leaved for this font in PDF/A document. And key question here - what data must be taken from another subtables to copy into destination encoding table (3,0)? Majority of fonts have 'well-formed' cmap tables where every encoding subtable is fully consistent with another subtable. But some fonts have cmap tables with collisions - where for example one subtable has glyph index 100 for unicode 100, but another subtable has glyph index 200 for the same unicode 100. To solve this problems special strategy needed. By default following strategy used: mac subtable(1,0) is looked for. If this table is found, only this data used to fill destination table (3,0). If mac subtable is not found then all subtables except (3,0) are iterated and used to copy data into destination (3,0) subtable. Also mapping for every unicode(unicode, glyph index) is copied into destination table only if destination table has no this unicode at current moment. So, for example if first subtabe has glyph index 100 for unicode 100, and next subtable has glyph index 200 for the same unicode 100, only data from first subtable (unicode=100, glyph index = 100) will be copied. So each previous subtable takes precedence over the next. Properties of this class PdfASymbolicFontEncodingStrategy help tune default behaviour. If property PreferredCmapEncodingTable of type QueueItem::CMapEncodingTableType is set, then relevant subtable will be used in precedence to mac subtable(1,0). Value 'MacTable' from enumeration QueueItem::CMapEncodingTableType has no sense in this case, cause it points on the same mac subtable (1,0) which will be used by default. Property CmapEncodingTablesPriorityQueue discards all priorities for any subtable. If this property is set, then only subtables from declared queue will be used in specified order. If subtables specified are not found then default iteration of all subtables and copy strategy described above will be used. Object QueueItem specifies encoding subtable used. This subtable can be set via combination of members(PlatformID, PlatformSpecificID) or via QueueItem::CMapEncodingTableType enumeration.

Constructor & Destructor Documentation

◆ PdfASymbolicFontEncodingStrategy() [1/3]

Aspose::Pdf::PdfASymbolicFontEncodingStrategy::PdfASymbolicFontEncodingStrategy ( )

Constructor. Sets default subtable (mac 1,0)

◆ PdfASymbolicFontEncodingStrategy() [2/3]

Aspose::Pdf::PdfASymbolicFontEncodingStrategy::PdfASymbolicFontEncodingStrategy ( System::SharedPtr< System::Collections::Generic::Queue< System::SharedPtr< PdfASymbolicFontEncodingStrategy::QueueItem >>>  priorityQueue)

Constructor

Parameters
priorityQueuequeue of encoding subtables to iterate

◆ PdfASymbolicFontEncodingStrategy() [3/3]

Aspose::Pdf::PdfASymbolicFontEncodingStrategy::PdfASymbolicFontEncodingStrategy ( PdfASymbolicFontEncodingStrategy::QueueItem::CMapEncodingTableType  preferredEncodingTable)

Constructor

Parameters
preferredEncodingTableencoding subtable which will be used in precedence to mac subtable(1,0)

Member Function Documentation

◆ get_CmapEncodingTablesPriorityQueue()

System::SharedPtr<System::Collections::Generic::Queue<System::SharedPtr<PdfASymbolicFontEncodingStrategy::QueueItem> > > Aspose::Pdf::PdfASymbolicFontEncodingStrategy::get_CmapEncodingTablesPriorityQueue ( )

Specifies queue of encoding subtables to process.

◆ get_PreferredCmapEncodingTable()

PdfASymbolicFontEncodingStrategy::QueueItem::CMapEncodingTableType Aspose::Pdf::PdfASymbolicFontEncodingStrategy::get_PreferredCmapEncodingTable ( )

Specifies subtable which will be used in precedence to mac subtable(1,0). Value 'MacTable' from enumeration QueueItem::CMapEncodingTableType has no sense in this case.

◆ set_CmapEncodingTablesPriorityQueue()

void Aspose::Pdf::PdfASymbolicFontEncodingStrategy::set_CmapEncodingTablesPriorityQueue ( System::SharedPtr< System::Collections::Generic::Queue< System::SharedPtr< PdfASymbolicFontEncodingStrategy::QueueItem >>>  value)

Specifies queue of encoding subtables to process.

◆ set_PreferredCmapEncodingTable()

void Aspose::Pdf::PdfASymbolicFontEncodingStrategy::set_PreferredCmapEncodingTable ( PdfASymbolicFontEncodingStrategy::QueueItem::CMapEncodingTableType  value)

Specifies subtable which will be used in precedence to mac subtable(1,0). Value 'MacTable' from enumeration QueueItem::CMapEncodingTableType has no sense in this case.