IlvBlendFilter Class Reference

Blend filter. More...

#include <ilviews/bitmaps/filters/blend.h>

Inheritance diagram for IlvBlendFilter:

List of all members.

Public Types
enum	BlendMode {   Normal, Multiply, Screen, Darken,   Lighten }
Public Member Functions
	IlvBlendFilter (BlendMode mode=Normal)
	Constructor.
	~IlvBlendFilter ()
	Destructor.
IlvBitmapData *	apply (IlUInt count=0, const IlvBitmapData **datas=0)
	Applies the blending to the given images.
BlendMode	getMode () const
	Returns the blending mode.
void	setMode (BlendMode mode)
	Sets the mode used for blending the images.

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Detailed Description

Blend filter.

Library: ilvbmpflt

This bitmap filter lets you blend two images together using predefined modes.

See also:

IlvRGBBitmapData, IlvBitmapFilter BlendMode

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Member Enumeration Documentation

enum IlvBlendFilter::BlendMode

This enumeration defines the possible values for the blend mode. For all blend modes, the resulting opacity is computed as follows: qr = 1 - (1 - qa) * (1 - qb)

For the blending formulas below, the following apply:

cr = Result color (RGB) - premultiplied
qa Opacity value at a given pixel for image A
qb Opacity value at a given pixel for image B
ca = Color (RGB) at a given pixel for image A - premultiplied
cb = Color (RGB) at a given pixel for image B - premultiplied

See also:

IlvBlendFilter::setMode, IlvBlendFilter::getMode

Enumerator:

Normal	The formula is: cr = (1 - qa) * cb + ca
Multiply	The formula is: cr = (1 - qa) * cb + (1 - qb) * ca + ca * cb
Screen	The formula is: cr = cb + ca - ca * cb
Darken	The formula is: cr = Min((1 - qa) * cb + ca, (1 - qb) * ca + cb)
Lighten	The formula is: Max((1 - qa) * cb + ca, (1 - qb) * ca + cb)

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Constructor & Destructor Documentation

IlvBlendFilter::IlvBlendFilter

(

BlendMode

mode = Normal

)

Constructor.

Initializes a new instance of the class IlvBlendFilter.

IlvBlendFilter::~IlvBlendFilter

(

)

Destructor.

The destructor releases all the memory used by the instance.

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Member Function Documentation

BlendMode IlvBlendFilter::getMode

(

)

const

Returns the blending mode.

Returns:

The blending mode

See also:

BlendMode

void IlvBlendFilter::setMode

(

BlendMode

mode

)

Sets the mode used for blending the images.

Parameters:

mode

The new blending mode.

See also:

BlendMode