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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.
TGraphicsOperation
- Abstract base class for all graphics operations.
TGopBitBltAlphaChannel
- An accelerated graphics operation that copies a rectangular region of one bitmap...
Defined in TGopBitBltAlphaChannel
:
TGopBitBltAlphaChannel(const TPoint &,TAcceleratedBitmapSpec,TRect &)
Constructor with a position, a bitmap handle and a rectangle. iDestination
The destination for the top left hand corner of the portion of the bitmap. iSourceBitmap
A handle to the source bitmap, and other information needed to access it. iSourceRect
A rectangle defining all or a part of the bitmap to be copied. Inherited from TGraphicsOperation
:
Append(TInt,TAny *)
EAlphaBlendOneBitmap
EAlphaBlendTwoBitmaps
EBitBlt
EBitBltAlphaBitmap
EBitBltAlphaChannel
EBitBltMasked
EBitBltTransparent
EChunkTest
EFadeRect
EFilledPolygon
EFilledPolygonWithPattern
EFilledRect
EFilledRectUsingDrawMode
EFilledRectWithPattern
EInvertRect
EScaledBitBlt
EScaledBitBltAlphaBitmap
EScaledBitBltAlphaChannel
EScaledBitBltMasked
EScaledBitBltTransparent
EVirtualAddressTest
Function()const
Next()const
Size()const
TGopFunction
TGraphicsOperation(TGopFunction,TInt)
iFunction
iSize
TGraphicsAcceleratorCaps::iAlphaChannel
Specifies the capabilities relating to operations that use an alpha channel. Use...inline TGopBitBltAlphaChannel(const TPoint &aDestination, TAcceleratedBitmapSpec aSourceBitmap, TRect &aSourceRect);
Constructor with a position, a bitmap handle and a rectangle.
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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.