IFontMetricsTable Class Reference

#include <IFontMetricsTable.h>

Inheritance diagram for IFontMetricsTable:

Public Types
enum	{ kDefaultIID = IID_IFONTMETRICSTABLE }

Public Member Functions
virtual bool16	GetTsumeHorizontal (const PMMatrix &matrix, Text::GlyphID glyph, PMReal *before, PMReal *after)=0
virtual bool16	GetTsumeVertical (const PMMatrix &matrix, Text::GlyphID glyph, PMReal *above, PMReal *below)=0
virtual void	ClearTable ()=0
Public Member Functions inherited from IPMUnknown
virtual IPMUnknown *	QueryInterface (PMIID interfaceID) const =0
virtual void	AddRef () const =0
virtual void	Release () const =0

Detailed Description

In the Japanese version of InDesign a feature called "Tsume" is available. This feature removes a percentage of the whitespace from either side of a glyph. It works by getting the exact ink bounding box of a particular glyph and comparing that with the pen-advance. Because this data is completely unavailable when the font is missing, we store the values, as they are used, in this table. Each font that has been used with Tsume has its own table. These tables are available from the IFontMetricTableList.

See Also

IFontMetricsTableList

Member Function Documentation

virtual void IFontMetricsTable::ClearTable ( )

pure virtual

Clear the table of saved side-bearings for this font. This function is generally only called by IFontMetricsTableList::ClearFontMetricsTable which is called by the composite font system.

virtual bool16 IFontMetricsTable::GetTsumeHorizontal ( const PMMatrix &  matrix, Text::GlyphID  glyph, PMReal *  before, PMReal *  after  )

pure virtual

For a glyphID at a particular size, get the amount of white space before & after the actual ink bounds in the horizontal direction.

Parameters

matrix	specifies the character matrix being considered. Only the 2x2 matrix is used.
glyph	is the glyphID of requested.
before	RETURNS the amount of whitespace before the glyph. Can be nil.
after	RETURNS the amount of whitespace after the glyph. Can be nil.

Returns

kFalse if the font was missing or the glyph was unavailable in some way.

virtual bool16 IFontMetricsTable::GetTsumeVertical ( const PMMatrix &  matrix, Text::GlyphID  glyph, PMReal *  above, PMReal *  below  )

pure virtual

For a glyphID at a particular size, get the amount of white space above & below the actual ink bounds in the vertical direction.

Parameters

matrix	specifies the character matrix being considered. Only the 2x2 matrix is used.
glyph	is the glyphID of requested.
above	RETURNS the amount of whitespace above the glyph. Can be nil.
below	RETURNS the amount of whitespace below the glyph. Can be nil.

Returns

kFalse if the font was missing or the glyph was unavailable in some way.