Unit 'CYBERGRAPHICS'	Package
[Overview][Constants][Types][Procedures and functions][Variables][Index]	[#morphunits]

ScalePixelArrayAlpha

Scale the colors value of a rectangular array (V51)

Declaration

Source position: cybergraphics.pas line 330

function ScalePixelArrayAlpha(

srcRect: POINTER;

SrcW: Word;

SrcH: Word;

SrcMod: Word;

a1arg: PRastPort;

DestX: Word;

DestY: Word;

DestW: Word;

DestH: Word;

globalAlpha: LongWord

):LongInt;

Arguments

`srcRect`		pointer to an array of pixels from which to fetch the pixel data. The pixel format is fixed to RECTFMT_ARGB and the alpha 8bit value is used to blend the data into the target
`SrcW`		Width of the source rectangle
`SrcH`		Height of the source rectangle
`SrcMod`		The number of bytes per row in the source rectangle.
`a1arg`		pointer to a RastPort structure
`DestX`		X starting point in the RastPort
`DestY`		Y starting point in the RastPort
`DestW`		Width of the destination area
`DestH`		Height of the destination area
`globalAlpha`		32bit left justified global alpha value, e.g. use $FFFFFFFF for full opacity. This global value is combined with the per pixel alpha of the source rectangle

Description

Scale the colors value of a rectangular array of pixels starting at a specified x,y location and continuing through to another x,y location within a certain RastPort (v51)

For each pixel in a rectangular region, scale and blend the color values from a linear alpha array of truecolor values into the bitmap used to describe a particular rastport.

This function should only be used on screens depths > 8 bits.

Uses hardware acceleration on dedicated hardware