TGopBitBltAlphaChannel Class Reference
| class TGopBitBltAlphaChannel : public TGraphicsOperation |
An accelerated graphics operation that copies a rectangular region of one bitmap into another, using alpha blending.
The alpha value is part of each pixel in the source bitmap. For instance, a 32 bits per pixel bitmap may have 8 bits for each of the alpha, red, green and blue values.
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
Constructor & Destructor Documentation
TGopBitBltAlphaChannel(const TPoint &, TAcceleratedBitmapSpec, TRect &)
Constructor with a position, a bitmap handle and a rectangle.
Parameters
| const TPoint & aDestination | The destination for the top left hand corner of the portion of the source bitmap. |
| TAcceleratedBitmapSpec aSourceBitmap | A handle to the source bitmap, and other information needed to draw it. |
| TRect & 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. |
Member Data Documentation
TPoint
iDestination
The destination for the top left hand corner of the portion of the bitmap.
TAcceleratedBitmapSpec
iSourceBitmap
A handle to the source bitmap, and other information needed to access it.
TRect
iSourceRect
A rectangle defining all or a part of the bitmap to be copied.
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