TGopScaledBitBltAlphaChannel Class Reference

#include <graphicsaccelerator.h>

class TGopScaledBitBltAlphaChannel : public TGraphicsOperation

Inherits from

TGopScaledBitBltAlphaChannel
- TGraphicsOperation

Public Attributes
TRect	iDestination
TAcceleratedBitmapSpec	iSourceBitmap
TRect	iSourceRect

Public Member Functions
	TGopScaledBitBltAlphaChannel(const TRect &, TAcceleratedBitmapSpec, TRect &)

Inherited Attributes
	TGraphicsOperation::iFunction
	TGraphicsOperation::iSize

Inherited Enumerations
	TGraphicsOperation:TGopFunction

Inherited Functions
	TGraphicsOperation::Append(TInt,TAny *)
	TGraphicsOperation::Function()const
	TGraphicsOperation::Next()const
	TGraphicsOperation::Size()const
	TGraphicsOperation::TGraphicsOperation()
	TGraphicsOperation::TGraphicsOperation(TGopFunction,TInt)

Detailed Description

An accelerated graphics operation that copies a rectangular region of one bitmap into a different sized region of another using alpha blending. The alpha value is part of each pixel in the source bitmap.

Supported bitmap formats with an alpha-channel are given in by TGraphicsAcceleratorCaps::iAlphaChannel.

The data members are all initialised on construction. Objects of this class can be passed to a graphics accelerator's Operation() function either individually, or in a buffer.

Member Attribute Documentation

iDestination

TRect

iDestination

The destination for the portion of the source bitmap.

iSourceBitmap

TAcceleratedBitmapSpec

iSourceBitmap

A handle to the source bitmap, and other information needed to draw it.

iSourceRect

TRect

iSourceRect

A rectangle defining the part of the source bitmap to be copied.

Constructor & Destructor Documentation

TGopScaledBitBltAlphaChannel ( const TRect &, TAcceleratedBitmapSpec, TRect & )

TGopScaledBitBltAlphaChannel	(	const TRect &	aDestination,
		TAcceleratedBitmapSpec	aSourceBitmap,
		TRect &	aSourceRect
	)	[inline]

Constructor with a destination rectangle, a handle to the source bitmap and a source rectangle.

Parameter	Description
aDestination	The destination for the portion of the source bitmap. If necessary, the source bitmap portion is resized to fit into this rectangle.
aSourceBitmap	A handle to the source bitmap, and other information needed to draw it.
aSourceRect	A rectangle within the source bitmap. Its coordinates are relative to the top left of the source bitmap. Defines the part of the source bitmap to be copied.