TGopScaledBitBltAlphaChannel Class Reference

class TGopScaledBitBltAlphaChannel : public TGraphicsOperation

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.

TGraphicsAcceleratorCaps::iAlphaChannel

Inherits from

Constructor & Destructor Documentation

TGopScaledBitBltAlphaChannel(const TRect &, TAcceleratedBitmapSpec, TRect &)

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

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

Parameters

const TRect & aDestinationThe destination for the portion of the source bitmap. If necessary, the source bitmap portion is resized to fit into this rectangle.
TAcceleratedBitmapSpec aSourceBitmapA handle to the source bitmap, and other information needed to draw it.
TRect & aSourceRectA 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.

Member Data Documentation

TRect iDestination

TRect iDestination

The destination for the portion of the source bitmap.

TAcceleratedBitmapSpec iSourceBitmap

TAcceleratedBitmapSpec iSourceBitmap

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

TRect iSourceRect

TRect iSourceRect

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