BitMapScale

Perform raster scaling on a bit map.

Declaration

Source position: agraphics.pas line 2406

Arguments

Description

Scale a source bit map to a non-overlapping destination bit map.

Overlapping source and destination bitmaps are not supported Make sure that you provide enough memory for the destination bitmap to hold the result

In the destination bitmap only the area where the scaled source bitmap is put into is changed. A frame of the old bitmap is left.

Pass a BitScaleArgs structure filled with the following arguments to this function:

bsa_SrcX, bsa_SrcY

upper left coordinate in source bitmap

bsa_SrcWidth, bsa_SrcHeight

Width and Height of source bitmap

bsa_DestX, bsa_DestY

upper left coordinate in destination bitmap

bsa_DestWidth, bsa_DestHeight

this function will set these values. Use the bsa_???Factor for scaling

bsa_XSrcFactor:bsa_XDestFactor

Set these to get approximately the same ratio as bsa_SrcWidth:bsa_DestWidth, but usually not exactly the same number.

bsa_YSrcFactor:bsa_YDestFactor

Set these to get approximately the same ratio as bsa_SrcHeight:DestHeight, but usually not exactly the same number.

bsa_SrcBitMap

pointer to source bitmap to be scaled

bsa_DestBitMap

pointer to destination bitmap which will hold the scaled bitmap. Make sure it's big enough!

bsa_Flags

reserved for future use. Set it to zero!

bsa_XDDA, bsa_YDDA

for future use.

bsa_Reserved1, bsa_Reserved2

for future use.

bsa_DestWidth and bsa_DestHeight will be set by this function

See also