Class TGopScaledBitBltAlphaChannel

class TGopScaledBitBltAlphaChannel : public TGraphicsOperation;

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.

Derivation

• TGraphicsOperation - Abstract base class for all graphics operations

• TGopScaledBitBltAlphaChannel - An accelerated graphics operation that copies a rectangular region of one bitmap into a different sized region of another using alpha blending

Members

Defined in TGopScaledBitBltAlphaChannel:
TGopScaledBitBltAlphaChannel(), iDestination, iSourceBitmap, iSourceRect

Inherited from TGraphicsOperation:
Append(), EAlphaBlendOneBitmap, EAlphaBlendTwoBitmaps, EBitBlt, EBitBltAlphaBitmap, EBitBltAlphaChannel, EBitBltMasked, EBitBltTransparent, EFadeRect, EFilledPolygon, EFilledPolygonWithPattern, EFilledRect, EFilledRectUsingDrawMode, EFilledRectWithPattern, EInvertRect, EScaledBitBlt, EScaledBitBltAlphaBitmap, EScaledBitBltAlphaChannel, EScaledBitBltMasked, EScaledBitBltTransparent, Function(), Next(), Size(), TGopFunction, iFunction, iSize

See also:

• TGraphicsAcceleratorCaps::iAlphaChannel

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

Description

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

Parameters

const TRect &aDestination The destination for the portion of the source bitmap. If necessary, the source bitmap portion is resized to fit into this rectangle. 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.

TRect iDestination;

Description

The destination for the portion of the source bitmap.

TAcceleratedBitmapSpec iSourceBitmap;

Description

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

TRect iSourceRect;

Description

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