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GuruMeditation
Docs » Autodocs » graphics.library » BitMapScale

NAME

	BitMapScale -- Perform raster scaling on a bit map. (V36)

SYNOPSIS

	BitMapScale(bitScaleArgs)
	            A0
	void BitMapScale(struct BitScaleArgs *);

FUNCTION

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

INPUTS

	bitScaleArgs - structure of parameters describing scale:
	    bsa_SrcX, bsa_SrcY - origin of the source bits.
	    bsa_SrcWidth, bsa_SrcHeight - number of bits to scale from in x
	    and y.
	    bsa_DestX, bsa_DestY - origin of the destination.
	    bsa_DestWidth, bsa_DestHeight - resulting number of bits in x
	    and y.  NOTE: these values are set by this function.
	    bsa_XSrcFactor:bsa_XDestFactor - equivalent to the ratio
	        srcWidth:destWidth, but not necessarily the same
	        numbers.  Each must be in the range 1..16383.
	    bsa_YSrcFactor:bsa_YDestFactor - equivalent to the ratio
	        srcHeight:destHeight, but not necessarily the same
	        numbers.  Each must be in the range 1..16383.
	    bsa_SrcBitMap - source of the bits to scale.
	    bsa_DestBitMap - destination for the bits to scale.  This had
	        better be big enough!
	    bsa_Flags - future scaling options.  Set it to zero!
	    bsa_XDDA, bsa_YDDA - for future use.  Need not be set by user.
	    bsa_Reserved1, bsa_Reserved2 - for future use.  Need not be set.

RESULT

	The destWidth, destHeight fields are set by this function as
	described above.

NOTES

	o   This function may use the blitter.
	o   Overlapping source and destination bit maps are not
	    supported.
	o   No check is made to ensure destBitMap is big enough: use
	    ScalerDiv to calculate a destination dimension.

BUGS

	o   This function does not use the HighRes Agnus 'Big Blit'
	    facility. You should not use XSrcFactor == XDestFactor,
	    where SrcWidth or DestWidth > 1024.
	o   Also, the blitter is used when expanding in the Y direction.
	    You should not expand in the Y direction if
	    ((DestX & 0xf) + DestWidth) >= 1024 pixels. (Up to 1008 pixels
	    is always safe).

SEE ALSO

ScalerDiv(), <graphics/scale.h>

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