CGraphicsDevice Class Reference

class CGraphicsDevice : public CBase

Specifies the interface for concrete device classes.

It holds information on the capabilities and attributes of a graphics device. The CBitmapDevice and CPrinterDevice classes are derived from CGraphicsDevice.

CGraphicsDevice

CPrinterDevice

Inherits from

CGraphicsDevice
- CBase

Public Member Functions
TInt	CreateContext(CGraphicsContext *&)
TDisplayMode	DisplayMode()
TInt	FontHeightInTwips(TInt, TInt)
TInt	GetPalette(CPalette *&)
TInt	NumTypefaces()
void	PaletteAttributes(TBool &, TInt &)
void	SetPalette(CPalette *)
TSize	SizeInPixels()
TSize	SizeInTwips()
void	TypefaceSupport(TTypefaceSupport &, TInt)

Inherited Functions
	CBase::CBase()
	CBase::Delete(CBase *)
	CBase::Extension_(TUint,TAny &,TAny )
	CBase::operator new(TUint)
	CBase::operator new(TUint,TAny *)
	CBase::operator new(TUint,TLeave)
	CBase::operator new(TUint,TLeave,TUint)
	CBase::operator new(TUint,TUint)
	CBase::~CBase()

Member Functions Documentation

CreateContext(CGraphicsContext *&)

TInt

CreateContext

(

CGraphicsContext *&

aGC

)

[pure virtual]

Creates a graphics context for the device.

KErrNone, if successful; otherwise, another of the system-wide error codes.

Parameters

CGraphicsContext *& aGC

On return, contains a pointer to the created graphics context.

DisplayMode()

TDisplayMode

DisplayMode

(

)

const [pure virtual]

Gets the display mode of the device.

The display mode of the device.

FontHeightInTwips(TInt, TInt)

TInt	FontHeightInTwips	(	TInt	aTypefaceIndex,
			TInt	aHeightIndex
		)	const [pure virtual]

Get the height of a font in twips.

The font is identified by typeface and height.

The value returned is rounded up or down to the nearest font height in twips.

The height of the font, in twips.

Parameters

TInt aTypefaceIndex	An index identifying the typeface, in the range: 0 to (NumTypefaces() - 1).
TInt aHeightIndex	An index identifying the font height, in the range: 0 to (iNumHeights - 1). Note that iNumHeights is in the TTypefaceSupport object returned by TypefaceSupport().

GetPalette(CPalette *&)

TInt

GetPalette

(

CPalette *&

aPalette

)

const [pure virtual]

Gets the device's current palette.

This function is only supported if the device has a modifiable palette, which can be determined by calling PaletteAttributes().

KErrNone, if successful; otherwise, another of the system-wide error codes.

Parameters

CPalette *& aPalette

On return, holds the device's current palette.

NumTypefaces()

TInt

NumTypefaces

(

)

const [pure virtual]

Gets the number of typefaces supported by the graphics device.

The number of typefaces supported.

PaletteAttributes(TBool &, TInt &)

void	PaletteAttributes	(	TBool &	aModifiable,
			TInt &	aNumEntries
		)	const [pure virtual]

Gets the palette attributes of the device.

Parameters

TBool & aModifiable	On return, holds information on whether or not the device's palette is modifiable (ETrue) or fixed (EFalse).
TInt & aNumEntries	On return, holds the number of entries in the device's palette.

SetPalette(CPalette *)

void

SetPalette

(

CPalette *

aPalette

)

[pure virtual]

Sets the device's palette.

Setting the palette is only possible if the device has a modifiable palette, which can be determined by calling PaletteAttributes().

Parameters

CPalette * aPalette

The new palette for the device.

SizeInPixels()

TSize

SizeInPixels

(

)

const [pure virtual]

Gets the size of the device area in pixels.

The width and height of the device area, in pixels

SizeInTwips()

TSize

SizeInTwips

(

)

const [pure virtual]

Gets the size of the device area in twips.

The width and height of the device area, in twips

TypefaceSupport(TTypefaceSupport &, TInt)

void	TypefaceSupport	(	TTypefaceSupport &	aTypefaceSupport,
			TInt	aTypefaceIndex
		)	const [pure virtual]

Gets typeface information for a specified typeface.

This information is returned in aTypefaceSupport, and includes:

the typeface name and typeface attributes

the number of font heights

the maximum and minimum font heights

whether it is a scalable typeface

NumTypefaces()

Parameters

TTypefaceSupport & aTypefaceSupport	On return, contains the typeface information.
TInt aTypefaceIndex	A typeface index number, in the range: zero to (NumTypefaces() - 1).