Class: TGrayDstInTransferMode

Declaration: GrayTransferModes.h

Taxonomy Categories:

Member Functions:

Interface Category:

API.

Inherits From:

TTransferMode

Inherited By:

None.

Purpose:

TGrayDstInTransferMode is a concrete class, derived from TTransferMode, for applying the destination inside compositing operation using a grayscale. (The source and destination colors need not be grayscale, but the resulting color is always a gray.) The result of the destination inside operation contains only the destination pixels that are inside the source area. If the source color is completely transparent (alpha =0.0), this transfer mode sets the resulting color to a completely transparent white. Otherwise the resultant gray value is determined by the destination color only, and the resultant transparency is the product of the source and destination's transparency values.

Instantiation:

Allocate on the heap or the stack.

Deriving Classes:

None.

Concurrency:

Not multithread safe.

Resource Use:

No special requirements.

Member Function: TGrayDstInTransferMode::TGrayDstInTransferMode

  1. TGrayDstInTransferMode ()
  2. TGrayDstInTransferMode (const TGrayDstInTransferMode &)

Interface Category:

API.

Purpose:

  1. Default constructor.
  2. Copy constructor.

Calling Context:

  1. Called by the stream-in operators. You can also call this function directly.
  2. Called to copy an object.

Parameters:

Return Value:

None.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.

Member Function: TGrayDstInTransferMode::~TGrayDstInTransferMode

virtual ~ TGrayDstInTransferMode ()

Interface Category:

API.

Purpose:

Destructor.

Calling Context:

Called to destroy an object.

Parameters:

Return Value:

None.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.

Member Function: TGrayDstInTransferMode::GetResultingColor

virtual void GetResultingColor (const TColor & sourceColor, const TColor & destColor, TColor & resultingColor) const

Interface Category:

API.

Purpose:

Replaces the source color with the destination color, taking into account the transparency information of the source color. If the source color is completely transparent (alpha =0.0), this transfer mode sets the resulting color to a completely transparent white. Otherwise the resultant gray value is determined by the destination color only, and the resultant transparency is the product of the source and destination's transparency values. The resulting grayscale color is returned as a TColor object.

Calling Context:

Call this function directly.

Parameters:

Return Value:

None.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.

Member Function: TGrayDstInTransferMode::GetDstInResult

static void GetDstInResult (const TGrayColor & sourceColor, const TGrayColor & destColor, TGrayColor & resultingColor)

Interface Category:

API.

Purpose:

Replaces the source color with the destination color, taking into account the transparency information of the source color. If the source color is completely transparent (alpha =0.0), this transfer mode sets the resulting color to a completely transparent white. Otherwise the resultant gray value is determined by the destination color only, and the resultant transparency is the product of the source's and destination's transparency values. The resulting grayscale color is returned as a TGrayColor object.

Calling Context:

Call this function directly.

Parameters:

Return Value:

None.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.

Member Function: TGrayDstInTransferMode::operator=

TGrayDstInTransferMode & operator =(const TGrayDstInTransferMode & source)

Interface Category:

API.

Purpose:

Assignment operator.

Calling Context:

Call this function by using the operator in an assignment statement.

Parameters:

Return Value:

A non-const reference to the left-hand side object.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.

Member Function: TGrayDstInTransferMode::operator>>=

virtual TStream & operator >>=(TStream & towhere) const

Interface Category:

API.

Purpose:

Stream-out operator.

Calling Context:

Called to stream out data.

Parameters:

Return Value:

Returns a reference to the stream the object streams itself out to.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.

Member Function: TGrayDstInTransferMode::operator<<=

virtual TStream & operator <<= (TStream & fromwhere)

Interface Category:

API.

Purpose:

Stream-in operator.

Calling Context:

Called to stream in data.

Parameters:

Return Value:

Returns a reference to the stream the object streams itself in from.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.

Member Function: TGrayDstInTransferMode::TemporaryTypeID

virtual ETransferModeClassID TemporaryTypeID () const

Interface Category:

API.

Purpose:

Returns the type of transfer mode this class represents.

Calling Context:

Call this function directly.

Parameters:

Return Value:

Returns an ETransferModeClassID with value kGrayDstInTransferMode.

Exceptions:

Throws no exceptions, passes all exceptions through.

Concurrency:

Not multithread safe.

Other Considerations:

None.
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