MOpenFontShapingExtension Class Reference

#include <openfont.h>

class MOpenFontShapingExtension

Nested Classes and Structures

MOpenFontShapingExtension::TExtensionFontMetrics

Public Member Functions
pure virtual void	GetExtensionFontMetrics(TExtensionFontMetrics &)
pure virtual TInt	GlyphIndex(TInt)
pure virtual TBool	GlyphPointInFontUnits(TInt, TInt, TInt &, TInt &)
pure virtual TBool	GlyphPointInHintedPixels(TInt, TInt, TReal &, TReal &)
pure virtual void	RasterizeGlyphL(TInt, TOpenFontGlyphData *)

Detailed Description

Open Font System Extension Interface abstract base class.

COpenFont derivers should also derive from this interface to enable complex font "shaping".

This interface should be returned by the overridden COpenFont::ExtendedInterface function when KUidOpenFontShapingExtension is supplied as the UID.

Member Function Documentation

GetExtensionFontMetrics ( TExtensionFontMetrics & )

void

GetExtensionFontMetrics

(

TExtensionFontMetrics &

aOut

)

[pure virtual]

Returns font metrics.

Parameter	Description
aOut	Font metrics returned.

GlyphIndex ( TInt )

TInt

GlyphIndex

(

TInt

aUnicodeCharacter

)

const [pure virtual]

Maps a character to a glyph index.

Parameter	Description
aUnicodeCharacter	Unicode character code to be mapped.

Returns: Glyph code corresponding to aUnicodeCharacter.

GlyphPointInFontUnits ( TInt, TInt, TInt &, TInt & )

TBool	GlyphPointInFontUnits	(	TInt	aGlyphIndex,
			TInt	aPointNumber,
			TInt &	aX,
			TInt &	aY
		)	const [pure virtual]

Returns the coordinates of a particular (unhinted) point in the outline of the given glyph in font units.

Parameter	Description
aPointNumber	The number of the point.
aX	Returns the point's X co-ordinate in font units.
aY	Returns the point's Y co-ordinate in font units.

Returns: True on success, false otherwise.

GlyphPointInHintedPixels ( TInt, TInt, TReal &, TReal & )

TBool	GlyphPointInHintedPixels	(	TInt	aGlyphIndex,
			TInt	aPointNumber,
			TReal &	aX,
			TReal &	aY
		)	const [pure virtual]

Returns the hinted pixel coordinates of a particular point in the outline of the given glyph.

Parameter	Description
aPointNumber	The number of the point.
aX	Returns the point's X pixel value.
aY	Returns the point's Y pixel value.

Returns: True on success, false otherwise.

RasterizeGlyphL ( TInt, TOpenFontGlyphData * )

void	RasterizeGlyphL	(	TInt	aCode,
			TOpenFontGlyphData *	aGlyphData
		)	[pure virtual]

Creates a bitmap for the specified Glyph code.

Implementations of this function should put the bitmap in aGlyphData->iBitmapBuffer, and the character metrics are placed in aGlyphData->iMetricsBuffer. The other parts of aGlyphData should be left alone.

This function provides the same functionality as the COpenFont::RasterizeL() except that the glyph code is supplied rather than the unicode.

For more information:

Parameter	Description
aCode	The glyph code of the character for which the bitmap is required.
aGlyphData	The function puts its output here.