JCL Help:StretchTransfer
JCL Help: StretchTransfer Function
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Summary
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Pascal
procedure StretchTransfer(Dst: TJclBitmap32; DstRect: TRect; Src: TJclBitmap32; SrcRect: TRect; StretchFilter: TStretchFilter; CombineOp: TDrawMode);
Description
StretchTransfer is similar to StretchBlt or StretchDIBits functions from Windows GDI. This procedure performs copying and, if necessary, stretching of the bitmap fragment specified by SrcRect into location in Dst specified by DstRect.
StretchFilter defines a color interpolation method for image stretching.
sfNearest is the fastest fileter, although the quality of the stretched image is fair;
sfLinear is several times slower, but it produces more decent results in most cases;
sfSpline is an approximation of spline interpolation.
Unlike in BlockTransfer function, SrcRect must lie inside the Src bitmap boundaries, otherwise function will generate an exception. The result is not specified when transferring data inside the same bitmap (Src=Dst) and if in the same time SrcRect intersects with DstRect. In this case it is recommended to use a temporary bitmap buffer.
This routine is used in TJclBitmap32.Draw and TJclBitmap32.DrawTo methods.
See Also
BlockTransfer TJclBitmap32 TDrawMode TPixelCombineEvent TRect TStretchFilter
About
Unit
Donator
Alex Denissov
Platforms
VCL
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