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MWsGraphicsContext Class Reference

class MWsGraphicsContext : public MWsObjectProvider

Render Stage abstract graphics context.

This interface is provided by Render Stages. It abstracts the graphics context of the pixel target. The intention is to allow Render Stages to intercept draw operations so that they can be batched (to reduce flickering), modified (to provide transition effects), or re-directed (to alternate back-end architectures).

Inherits from

MWsGraphicsContext
- MWsObjectProvider

Nested Classes and Structures

MWsGraphicsContext::TTextParameters

Public Member Functions
void	BitBlt (const TPoint &, const CFbsBitmap &)
void	BitBlt (const TPoint &, const CFbsBitmap &, const TRect &)
void	BitBltMasked (const TPoint &, const CFbsBitmap &, const TRect &, const CFbsBitmap &, TBool )
void	BitBltMasked (const TPoint &, const CFbsBitmap &, const TRect &, const CFbsBitmap &, const TPoint &)
TRgb	BrushColor ()
void	Clear ()
void	Clear (const TRect &)
const TRegion &	ClippingRegion ()
void	CopyRect (const TPoint &, const TRect &)
void	DrawArc (const TRect &, const TPoint &, const TPoint &)
void	DrawBitmap (const TRect &, const CFbsBitmap &)
void	DrawBitmap (const TRect &, const CFbsBitmap &, const TRect &)
void	DrawBitmapMasked (const TRect &, const CFbsBitmap &, const TRect &, const CFbsBitmap &, TBool )
void	DrawEllipse (const TRect &)
void	DrawLine (const TPoint &, const TPoint &)
void	DrawLineBy (const TPoint &)
void	DrawLineTo (const TPoint &)
void	DrawPie (const TRect &, const TPoint &, const TPoint &)
void	DrawPolyLine (const TArray < TPoint > &)
void	DrawPolyLineNoEndPoint (const TArray < TPoint > &)
void	DrawPolygon (const TArray < TPoint > &, TFillRule )
void	DrawRect (const TRect &)
void	DrawRoundRect (const TRect &, const TSize &)
void	DrawText (const TDesC &, const TTextParameters *)
void	DrawText (const TDesC &, const TTextParameters *, const TPoint &)
void	DrawText (const TDesC &, const TTextParameters *, const TRect &)
void	DrawText (const TDesC &, const TTextParameters *, const TRect &, TInt , TTextAlign , TInt )
void	DrawTextVertical (const TDesC &, const TTextParameters *, TBool )
void	DrawTextVertical (const TDesC &, const TTextParameters *, const TPoint &, TBool )
void	DrawTextVertical (const TDesC &, const TTextParameters *, const TRect &, TBool )
void	DrawTextVertical (const TDesC &, const TTextParameters *, const TRect &, TInt , TBool , TTextAlign , TInt )
void	DrawTextVertical (const TDesC &, const TTextParameters *, const TRect &, TInt , TInt , TBool , TTextAlign , TInt )
TInt	GetError ()
TBool	HasBrushPattern ()
TBool	HasFont ()
void	MoveBy (const TPoint &)
void	MoveTo (const TPoint &)
TPoint	Origin ()
TRgb	PenColor ()
void	Plot (const TPoint &)
void	Pop ()
TInt	Push ()
void	Reset ()
void	ResetBrushPattern ()
void	ResetClippingRegion ()
void	ResetFont ()
void	SetBrushColor (const TRgb &)
void	SetBrushOrigin (const TPoint &)
void	SetBrushPattern (const CFbsBitmap &)
void	SetBrushPattern ( TInt )
void	SetBrushStyle ( TBrushStyle )
void	SetCharJustification ( TInt , TInt )
void	SetClippingRegion (const TRegion &)
void	SetDrawMode ( TDrawMode )
void	SetFont (const CFont *)
void	SetFontNoDuplicate (const CFont *)
void	SetOrigin (const TPoint &)
void	SetPenColor (const TRgb &)
void	SetPenSize (const TSize &)
void	SetPenStyle ( TPenStyle )
void	SetStrikethroughStyle ( TFontStrikethrough )
void	SetTextShadowColor (const TRgb &)
void	SetUnderlineStyle ( TFontUnderline )
void	SetWordJustification ( TInt , TInt )
TRgb	TextShadowColor ()
void	UpdateJustification (const TDesC &, const TTextParameters *)
void	UpdateJustificationVertical (const TDesC &, const TTextParameters *, TBool )

Inherited Functions
	MWsObjectProvider::ObjectInterface()
	MWsObjectProvider::ObjectInterface()const
	MWsObjectProvider::ResolveObjectInterface(TUint)

Public Member Enumerations
enum	anonymous { EWsObjectInterfaceId = KMWsGraphicsContext }
enum	TBrushStyle { ENullBrush , ESolidBrush , EPatternedBrush , EVerticalHatchBrush , EForwardDiagonalHatchBrush , EHorizontalHatchBrush , ERearwardDiagonalHatchBrush , ESquareCrossHatchBrush , EDiamondCrossHatchBrush }
enum	TDrawMode { EDrawModePEN = 32, EDrawModeWriteAlpha = 64 }
enum	TFillRule { EAlternate , EWinding }
enum	TFontStrikethrough { EStrikethroughOff , EStrikethroughOn }
enum	TFontUnderline { EUnderlineOff , EUnderlineOn }
enum	TPenStyle { ENullPen , ESolidPen , EDottedPen , EDashedPen , EDotDashPen , EDotDotDashPen }
enum	TTextAlign { ELeft , ECenter , ERight }

Member Functions Documentation

BitBlt(const TPoint &, const CFbsBitmap &)

void	BitBlt	(	const TPoint &	aDestPos,
			const CFbsBitmap &	aSourceBitmap
		)	[pure virtual]

Parameters

const TPoint & aDestPos
const CFbsBitmap & aSourceBitmap

BitBlt(const TPoint &, const CFbsBitmap &, const TRect &)

void	BitBlt	(	const TPoint &	aDestPos,
			const CFbsBitmap &	aSourceBitmap,
			const TRect &	aSourceRect
		)	[pure virtual]

Parameters

const TPoint & aDestPos
const CFbsBitmap & aSourceBitmap
const TRect & aSourceRect

BitBltMasked(const TPoint &, const CFbsBitmap &, const TRect &, const CFbsBitmap &, TBool)

void	BitBltMasked	(	const TPoint &	aDestPos,
			const CFbsBitmap &	aSourceBitmap,
			const TRect &	aSourceRect,
			const CFbsBitmap &	aMaskBitmap,
			TBool	aInvertMask
		)	[pure virtual]

Parameters

const TPoint & aDestPos
const CFbsBitmap & aSourceBitmap
const TRect & aSourceRect
const CFbsBitmap & aMaskBitmap
TBool aInvertMask

BitBltMasked(const TPoint &, const CFbsBitmap &, const TRect &, const CFbsBitmap &, const TPoint &)

void	BitBltMasked	(	const TPoint &	aDestPos,
			const CFbsBitmap &	aSourceBitmap,
			const TRect &	aSourceRect,
			const CFbsBitmap &	aMaskBitmap,
			const TPoint &	aMaskPos
		)	[pure virtual]

Parameters

const TPoint & aDestPos
const CFbsBitmap & aSourceBitmap
const TRect & aSourceRect
const CFbsBitmap & aMaskBitmap
const TPoint & aMaskPos

BrushColor()

TRgb

BrushColor

(

)

const [pure virtual]

Clear()

void

Clear

(

)

[pure virtual]

Clear(const TRect &)

void

Clear

(

const TRect &

aRect

)

[pure virtual]

Parameters

const TRect & aRect

ClippingRegion()

const TRegion &

ClippingRegion

(

)

[pure virtual]

The clipping region currently being used

CopyRect(const TPoint &, const TRect &)

void	CopyRect	(	const TPoint &	aOffset,
			const TRect &	aRect
		)	[pure virtual]

Parameters

const TPoint & aOffset
const TRect & aRect

DrawArc(const TRect &, const TPoint &, const TPoint &)

void	DrawArc	(	const TRect &	aRect,
			const TPoint &	aStart,
			const TPoint &	aEnd
		)	[pure virtual]

Parameters

const TRect & aRect
const TPoint & aStart
const TPoint & aEnd

DrawBitmap(const TRect &, const CFbsBitmap &)

void	DrawBitmap	(	const TRect &	aDestRect,
			const CFbsBitmap &	aSourceBitmap
		)	[pure virtual]

Parameters

const TRect & aDestRect
const CFbsBitmap & aSourceBitmap

DrawBitmap(const TRect &, const CFbsBitmap &, const TRect &)

void	DrawBitmap	(	const TRect &	aDestRect,
			const CFbsBitmap &	aSourceBitmap,
			const TRect &	aSourceRect
		)	[pure virtual]

Parameters

const TRect & aDestRect
const CFbsBitmap & aSourceBitmap
const TRect & aSourceRect

DrawBitmapMasked(const TRect &, const CFbsBitmap &, const TRect &, const CFbsBitmap &, TBool)

void	DrawBitmapMasked	(	const TRect &	aDestRect,
			const CFbsBitmap &	aSourceBitmap,
			const TRect &	aSourceRect,
			const CFbsBitmap &	aMaskBitmap,
			TBool	aInvertMask
		)	[pure virtual]

Parameters

const TRect & aDestRect
const CFbsBitmap & aSourceBitmap
const TRect & aSourceRect
const CFbsBitmap & aMaskBitmap
TBool aInvertMask

DrawEllipse(const TRect &)

void

DrawEllipse

(

const TRect &

aRect

)

[pure virtual]

Parameters

const TRect & aRect

DrawLine(const TPoint &, const TPoint &)

void	DrawLine	(	const TPoint &	aStart,
			const TPoint &	aEnd
		)	[pure virtual]

Parameters

const TPoint & aStart
const TPoint & aEnd

DrawLineBy(const TPoint &)

void

DrawLineBy

(

const TPoint &

aVector

)

[pure virtual]

Parameters

const TPoint & aVector

DrawLineTo(const TPoint &)

void

DrawLineTo

(

const TPoint &

aPoint

)

[pure virtual]

Parameters

const TPoint & aPoint

DrawPie(const TRect &, const TPoint &, const TPoint &)

void	DrawPie	(	const TRect &	aRect,
			const TPoint &	aStart,
			const TPoint &	aEnd
		)	[pure virtual]

Parameters

const TRect & aRect
const TPoint & aStart
const TPoint & aEnd

DrawPolyLine(const TArray< TPoint > &)

void

DrawPolyLine

(

const TArray < TPoint > &

aPointList

)

[pure virtual]

Parameters

const TArray < TPoint > & aPointList

DrawPolyLineNoEndPoint(const TArray< TPoint > &)

void

DrawPolyLineNoEndPoint

(

const TArray < TPoint > &

aPointList

)

[pure virtual]

Parameters

const TArray < TPoint > & aPointList

DrawPolygon(const TArray< TPoint > &, TFillRule)

void	DrawPolygon	(	const TArray < TPoint > &	aPointList,
			TFillRule	aFillRule = EAlternate
		)	[pure virtual]

Parameters

const TArray < TPoint > & aPointList
TFillRule aFillRule = EAlternate

DrawRect(const TRect &)

void

DrawRect

(

const TRect &

aRect

)

[pure virtual]

Parameters

const TRect & aRect

DrawRoundRect(const TRect &, const TSize &)

void	DrawRoundRect	(	const TRect &	aRect,
			const TSize &	aEllipse
		)	[pure virtual]

Parameters

const TRect & aRect
const TSize & aEllipse

DrawText(const TDesC &, const TTextParameters *)

void	DrawText	(	const TDesC &	aText,
			const TTextParameters *	aParam
		)	[pure virtual]

Parameters

const TDesC & aText
const TTextParameters * aParam

DrawText(const TDesC &, const TTextParameters *, const TPoint &)

void	DrawText	(	const TDesC &	aText,
			const TTextParameters *	aParam,
			const TPoint &	aPosition
		)	[pure virtual]

Parameters

const TDesC & aText
const TTextParameters * aParam
const TPoint & aPosition

DrawText(const TDesC &, const TTextParameters *, const TRect &)

void	DrawText	(	const TDesC &	aText,
			const TTextParameters *	aParam,
			const TRect &	aClipRect
		)	[pure virtual]

Parameters

const TDesC & aText
const TTextParameters * aParam
const TRect & aClipRect

DrawText(const TDesC &, const TTextParameters *, const TRect &, TInt, TTextAlign, TInt)

void	DrawText	(	const TDesC &	aText,
			const TTextParameters *	aParam,
			const TRect &	aClipFillRect,
			TInt	aBaselineOffset,
			TTextAlign	aHrz = ELeft,
			TInt	aMargin = 0
		)	[pure virtual]

Parameters

const TDesC & aText
const TTextParameters * aParam
const TRect & aClipFillRect
TInt aBaselineOffset
TTextAlign aHrz = ELeft
TInt aMargin = 0

DrawTextVertical(const TDesC &, const TTextParameters *, TBool)

void	DrawTextVertical	(	const TDesC &	aText,
			const TTextParameters *	aParam,
			TBool	aUp
		)	[pure virtual]

Parameters

const TDesC & aText
const TTextParameters * aParam
TBool aUp

DrawTextVertical(const TDesC &, const TTextParameters *, const TPoint &, TBool)

void	DrawTextVertical	(	const TDesC &	aText,
			const TTextParameters *	aParam,
			const TPoint &	aPosition,
			TBool	aUp
		)	[pure virtual]

Parameters

const TDesC & aText
const TTextParameters * aParam
const TPoint & aPosition
TBool aUp

DrawTextVertical(const TDesC &, const TTextParameters *, const TRect &, TBool)

void	DrawTextVertical	(	const TDesC &	aText,
			const TTextParameters *	aParam,
			const TRect &	aClipRect,
			TBool	aUp
		)	[pure virtual]

Parameters

const TDesC & aText
const TTextParameters * aParam
const TRect & aClipRect
TBool aUp

DrawTextVertical(const TDesC &, const TTextParameters *, const TRect &, TInt, TBool, TTextAlign, TInt)

void	DrawTextVertical	(	const TDesC &	aText,
			const TTextParameters *	aParam,
			const TRect &	aClipRect,
			TInt	aBaselineOffset,
			TBool	aUp,
			TTextAlign	aVert = ELeft,
			TInt	aMargin = 0
		)	[pure virtual]

Parameters

const TDesC & aText
const TTextParameters * aParam
const TRect & aClipRect
TInt aBaselineOffset
TBool aUp
TTextAlign aVert = ELeft
TInt aMargin = 0

DrawTextVertical(const TDesC &, const TTextParameters *, const TRect &, TInt, TInt, TBool, TTextAlign, TInt)

void	DrawTextVertical	(	const TDesC &	aText,
			const TTextParameters *	aParam,
			const TRect &	aClipRect,
			TInt	aBaselineOffset,
			TInt	aTextWidth,
			TBool	aUp,
			TTextAlign	aVert = ELeft,
			TInt	aMargin = 0
		)	[pure virtual]

Parameters

const TDesC & aText
const TTextParameters * aParam
const TRect & aClipRect
TInt aBaselineOffset
TInt aTextWidth
TBool aUp
TTextAlign aVert = ELeft
TInt aMargin = 0

GetError()

TInt

GetError

(

)

[pure virtual]

HasBrushPattern()

TBool

HasBrushPattern

(

)

const [pure virtual]

HasFont()

TBool

HasFont

(

)

const [pure virtual]

MoveBy(const TPoint &)

void

MoveBy

(

const TPoint &

aVector

)

[pure virtual]

Parameters

const TPoint & aVector

MoveTo(const TPoint &)

void

MoveTo

(

const TPoint &

aPoint

)

[pure virtual]

Parameters

const TPoint & aPoint

Origin()

TPoint

Origin

(

)

const [pure virtual]

The origin of the GC relative to the screen's origin

PenColor()

TRgb

PenColor

(

)

const [pure virtual]

Plot(const TPoint &)

void

Plot

(

const TPoint &

aPoint

)

[pure virtual]

Parameters

const TPoint & aPoint

Pop()

void

Pop

(

)

[pure virtual]

Restores the last GC state that was saved.

Push()

TInt

Push

(

)

[pure virtual]

Saves the state of the GC to an internal buffer. Several GC states can be saved in a FILO. Do not restore a GC (using Pop() ) that wasn't properly saved!

Reset()

void

Reset

(

)

[pure virtual]

ResetBrushPattern()

void

ResetBrushPattern

(

)

[pure virtual]

ResetClippingRegion()

void

ResetClippingRegion

(

)

[pure virtual]

ResetFont()

void

ResetFont

(

)

[pure virtual]

SetBrushColor(const TRgb &)

void

SetBrushColor

(

const TRgb &

aColor

)

[pure virtual]

Parameters

const TRgb & aColor

SetBrushOrigin(const TPoint &)

void

SetBrushOrigin

(

const TPoint &

aOrigin

)

[pure virtual]

Parameters

const TPoint & aOrigin

SetBrushPattern(const CFbsBitmap &)

void

SetBrushPattern

(

const CFbsBitmap &

aBitmap

)

[pure virtual]

Parameters

const CFbsBitmap & aBitmap

SetBrushPattern(TInt)

void

SetBrushPattern

(

TInt

aFbsBitmapHandle

)

[pure virtual]

Parameters

TInt aFbsBitmapHandle

SetBrushStyle(TBrushStyle)

void

SetBrushStyle

(

TBrushStyle

aBrushStyle

)

[pure virtual]

Parameters

TBrushStyle aBrushStyle

SetCharJustification(TInt, TInt)

void	SetCharJustification	(	TInt	aExcessWidth,
			TInt	aNumChars
		)	[pure virtual]

Parameters

TInt aExcessWidth
TInt aNumChars

SetClippingRegion(const TRegion &)

void

SetClippingRegion

(

const TRegion &

aRegion

)

[pure virtual]

Parameters

const TRegion & aRegion

SetDrawMode(TDrawMode)

void

SetDrawMode

(

TDrawMode

aDrawMode

)

[pure virtual]

Parameters

TDrawMode aDrawMode

SetFont(const CFont *)

void

SetFont

(

const CFont *

aFont

)

[pure virtual]

Parameters

const CFont * aFont

SetFontNoDuplicate(const CFont *)

void

SetFontNoDuplicate

(

const CFont *

aFont

)

[pure virtual]

Parameters

const CFont * aFont

SetOrigin(const TPoint &)

void

SetOrigin

(

const TPoint &

aPoint = TPoint (0, 0)

)

[pure virtual]

Parameters

const TPoint & aPoint = TPoint (0, 0)

SetPenColor(const TRgb &)

void

SetPenColor

(

const TRgb &

aColor

)

[pure virtual]

Parameters

const TRgb & aColor

SetPenSize(const TSize &)

void

SetPenSize

(

const TSize &

aSize

)

[pure virtual]

Parameters

const TSize & aSize

SetPenStyle(TPenStyle)

void

SetPenStyle

(

TPenStyle

aPenStyle

)

[pure virtual]

Parameters

TPenStyle aPenStyle

SetStrikethroughStyle(TFontStrikethrough)

void

SetStrikethroughStyle

(

TFontStrikethrough

aStrikethroughStyle

)

[pure virtual]

Parameters

TFontStrikethrough aStrikethroughStyle

SetTextShadowColor(const TRgb &)

void

SetTextShadowColor

(

const TRgb &

aColor

)

[pure virtual]

Parameters

const TRgb & aColor

SetUnderlineStyle(TFontUnderline)

void

SetUnderlineStyle

(

TFontUnderline

aUnderlineStyle

)

[pure virtual]

Parameters

TFontUnderline aUnderlineStyle

SetWordJustification(TInt, TInt)

void	SetWordJustification	(	TInt	aExcessWidth,
			TInt	aNumGaps
		)	[pure virtual]

Parameters

TInt aExcessWidth
TInt aNumGaps

TextShadowColor()

TRgb

TextShadowColor

(

)

const [pure virtual]

UpdateJustification(const TDesC &, const TTextParameters *)

void	UpdateJustification	(	const TDesC &	aText,
			const TTextParameters *	aParam
		)	[pure virtual]

Parameters

const TDesC & aText
const TTextParameters * aParam

UpdateJustificationVertical(const TDesC &, const TTextParameters *, TBool)

void	UpdateJustificationVertical	(	const TDesC &	aText,
			const TTextParameters *	aParam,
			TBool	aUp
		)	[pure virtual]

Parameters

const TDesC & aText
const TTextParameters * aParam
TBool aUp

Member Enumerations Documentation

Enum anonymous

Enumerators

EWsObjectInterfaceId = KMWsGraphicsContext

Enum TBrushStyle

Brush styles.

Enumerators

ENullBrush	The brush fill has no effect (default).
ESolidBrush	The brush fills with a solid single colour, determined by SetBrushColor() and the drawing mode.
EPatternedBrush	The brush fills with a selected bitmap pattern, set by UseBrushPattern().
EVerticalHatchBrush	The brush fills with vertical hatching lines going from top to bottom.
EForwardDiagonalHatchBrush	The brush fills with diagonal hatching lines going from bottom left to top right.
EHorizontalHatchBrush	The brush fills with horizontal hatching lines going from left to right.
ERearwardDiagonalHatchBrush	The brush fills with rearward diagonal hatching lines going from top left to bottom right.
ESquareCrossHatchBrush	The brush fills with horizontal and vertical hatching lines going from left to right plus lines going from top to bottom giving the effect of a grid of small squares
EDiamondCrossHatchBrush	The brush fills with forward diagonal and rearward diagonal hatching lines going from bottom left to top right plus lines going from top left to bottom right giving the effect of a grid of small diamonds.

Enum TDrawMode

Drawing modes. The drawing modes define the way that the pen and brush colors are drawn, EDrawModePEN means do alpha blending if appropriate, EDrawModeWriteAlpha means don't do alpha blending.

SetDrawMode()

Enumerators

EDrawModePEN = 32	Uses both pen and brush colour as they are.
EDrawModeWriteAlpha = 64	Writes alpha information in the source directly into the destination, rather than blending.

Enum TFillRule

Rules used to fill self-intersecting polygons.

The filling of a polygon proceeds as follows: for a given point in the polygon, then:

if the rule is TFillRule::EAlternate (default) and it has an odd winding number, then fill the surrounding area.

if the rule is TFillRule::EWinding and it has a winding number greater than zero, then fill the surrounding area.

Enumerators

EAlternate	Only fill areas with odd winding numbers.
EWinding	Fill areas with winding numbers greater than zero.

Enum TFontStrikethrough

Font strike-through flags.

Enumerators

EStrikethroughOff	Font is not struck-through.
EStrikethroughOn	Font is struck-through.

Enum TFontUnderline

Font underline flags.

Enumerators

EUnderlineOff	Font is not underlined.
EUnderlineOn	Font is underlined.

Enum TPenStyle

Pen styles. The screen pattern unit in each definition below describes the pattern drawn by the line 1 represents a pixel drawn, 0 represents a pixel that is not affected.

Enumerators

ENullPen	The pen does not draw. Screen pattern unit = 00...
ESolidPen	A solid line (default). Screen pattern unit = 11...
EDottedPen	A dotted line. Screen pattern unit = 1000...
EDashedPen	A dashed line. Screen pattern unit = 111000...
EDotDashPen	A line of alternating dashes and dots. Screen pattern unit = 1111001100...
EDotDotDashPen	A line of alternating single dashes and pairs of dots. Screen pattern unit = 11110011001100...

Enum TTextAlign

Text alignment.

Enumerators

ELeft	Text is left-aligned.
ECenter	Text is centred.
ERight	Text is right-aligned.