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CImageTransformPlugin Class Reference

class CImageTransformPlugin : public CBase

This is the plugin API for the Image Transform framework Intended for use by plugin writers only.

Inherits from

CImageTransformPlugin
- CBase

Public Member Functions
	~CImageTransformPlugin ()
IMPORT_C CImageTransformPluginExtension *	Extension ( TUid , TInt &)

Protected Member Functions
	CImageTransformPlugin ()
void	CancelTransform ()
IMPORT_C HBufC8 *&	DestData ()
IMPORT_C const TDesC &	DestFilename ()
IMPORT_C TBool	DestIsData ()
IMPORT_C TBool	DestIsFilename ()
IMPORT_C const TSize &	DestinationSizeInPixels ()
IMPORT_C CImageTransformPluginExtension *	Extension ()
IMPORT_C TBool	MaintainAspectRatio ()
void	OpenL ()
IMPORT_C TUint	Options ()
IMPORT_C TBool	PreserveImageData ()
IMPORT_C const TDesC8 &	SourceData ()
IMPORT_C const TDesC &	SourceFilename ()
IMPORT_C const TUid	SourceImageSubType ()
IMPORT_C const TUid	SourceImageType ()
IMPORT_C TBool	SourceIsData ()
IMPORT_C TBool	SourceIsFilename ()
IMPORT_C const TDesC8 &	SourceMimeType ()
IMPORT_C TBool	SourceRect ( TRect &)
void	Transform ( TRequestStatus &)

Private Member Functions
IMPORT_C CImageTransformPlugin *	NewL ( TUid , CImageTransformFramework &)
IMPORT_C void	ReservedVirtual1 ()
IMPORT_C void	ReservedVirtual2 ()
IMPORT_C void	ReservedVirtual3 ()

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()

Private Attributes
CImageTransformFramework *	iFramework

Constructor & Destructor Documentation

CImageTransformPlugin()

IMPORT_C

CImageTransformPlugin

(

)

[protected]

Constructor for this class.

~CImageTransformPlugin()

IMPORT_C

~CImageTransformPlugin

(

)

This is the destructor for the CImageTransformPlugin and is responsible for deallocating all resources.

Member Functions Documentation

CancelTransform()

void

CancelTransform

(

)

[protected, pure virtual]

Cancel the image transform operation May be called by the framework even when there is no outstanding request.

This is a virtual function that each individual plugin must implement.

DestData()

IMPORT_C HBufC8 *&

DestData

(

)

const [protected]

Gets the destination descriptor

panic: EImageWrongType The destination is not a descriptor

DestFilename()

IMPORT_C const TDesC &

DestFilename

(

)

const [protected]

Gets the destination file name

panic: EImageWrongType The destination is not a file

DestIsData()

IMPORT_C TBool

DestIsData

(

)

const [protected]

Return whether the destination image is to be stored as data

DestIsFilename()

IMPORT_C TBool

DestIsFilename

(

)

const [protected]

Return whether the destination image is to be stored in a file

DestinationSizeInPixels()

IMPORT_C const TSize &

DestinationSizeInPixels

(

)

const [protected]

Gets the requested size of the destination image

Extension()

IMPORT_C CImageTransformPluginExtension *

Extension

(

)

const [protected, virtual]

When a plugin extension has been implemented, this function should be implemented by the plugin writer to enable the client access to the extension

Extension(TUid, TInt &)

IMPORT_C CImageTransformPluginExtension *	Extension	(	TUid	aExtensionUid,
			TInt &	aError
		)	const [virtual]

When a plugin extension has been implemented, this function should be implemented by the plugin writer to enable the client access to the extension

Parameters

TUid aExtensionUid	Uid of the required extension
TInt & aError	System wide error

MaintainAspectRatio()

IMPORT_C TBool

MaintainAspectRatio

(

)

const [protected]

Return whether the client wishes to maintain the source image's aspect ratio

NewL(TUid, CImageTransformFramework &)

IMPORT_C CImageTransformPlugin *	NewL	(	TUid	aImplementationUid,
			CImageTransformFramework &	aFramework
		)	[private, static]

The function NewL constructs a CImageTransformPlugin-derived ECOM plugin.

leave: KErrNotFound If the plugin could not be found

Parameters

TUid aImplementationUid	The ECOM implementation UID of the plugin
CImageTransformFramework & aFramework	A reference to the CImageTransformFramework object that is creating this object

OpenL()

void

OpenL

(

)

[protected, pure virtual]

Initialise the plugin and check the image transform settings.

This is called by the ImageTransform framework when the client app calls CImageTransform::SetupL() .

The plugin should check the validity of the source image and all other settings set by the client API. If any of these is unsupported then it should leave with KErrNotSupported.

A plugin implementing CImageTransformPluginExtension to allow extension of the client API should initialise it here.

This is a virtual function that each individual plugin must implement.

leave: KErrUnsupported The plugin decoder doesn not support the request transformation

Options()

IMPORT_C TUint

Options

(

)

const [protected]

Gets the options requested by the client

PreserveImageData()

IMPORT_C TBool

PreserveImageData

(

)

const [protected]

Return whether the client wishes to attempt to maintain the original image data

ReservedVirtual1()

IMPORT_C void

ReservedVirtual1

(

)

[private, virtual]

Reserved for future-proofing

ReservedVirtual2()

IMPORT_C void

ReservedVirtual2

(

)

[private, virtual]

Reserved for future-proofing

ReservedVirtual3()

IMPORT_C void

ReservedVirtual3

(

)

[private, virtual]

Reserved for future-proofing

SourceData()

IMPORT_C const TDesC8 &

SourceData

(

)

const [protected]

Gets the source descriptor

panic: EImageWrongType The source is not a descriptor

SourceFilename()

IMPORT_C const TDesC &

SourceFilename

(

)

const [protected]

Gets the source file name

panic: EImageWrongType The source is not a file

SourceImageSubType()

IMPORT_C const TUid

SourceImageSubType

(

)

const [protected]

Gets the source image's subtype

SourceImageType()

IMPORT_C const TUid

SourceImageType

(

)

const [protected]

Gets the source image's type

SourceIsData()

IMPORT_C TBool

SourceIsData

(

)

const [protected]

Return whether the source is data

SourceIsFilename()

IMPORT_C TBool

SourceIsFilename

(

)

const [protected]

Return whether the source is a file

SourceMimeType()

IMPORT_C const TDesC8 &

SourceMimeType

(

)

const [protected]

Gets the source image's MIME type

SourceRect(TRect &)

IMPORT_C TBool

SourceRect

(

TRect &

aRect

)

const [protected]

Gets the source image's clipping region

Parameters

TRect & aRect

The source image's clipping region

Transform(TRequestStatus &)

void

Transform

(

TRequestStatus &

aStatus

)

[protected, pure virtual]

Initiate the image transform operation

This is a virtual function that each individual plugin must implement.

Parameters

TRequestStatus & aStatus

The client's request status. On completion contains an error code. KErrNone if image was transformed successfully,

Member Data Documentation

CImageTransformFramework * iFramework

CImageTransformFramework *

iFramework

[private]