TLazCanvas.AlphaBlendIgnoringDestPixels procedure

Member of TLazCanvaspublicIn unit LazCanvas

Performs an AlphaBlend operation assuming a white background.

Declaration

pascal

procedure AlphaBlendIgnoringDestPixels(ASource: TLazCanvas; 
 const ADestX: Integer; 
 const ADestY: Integer; 
 const ASourceX: Integer; 
 const ASourceY: Integer; 
 const ASourceWidth: Integer; 
 const ASourceHeight: Integer)

Arguments

`ASource`	Lazarus canvas with the content alpha blended onto the current class instance.
`ADestX`	Left coordinate where the content in ASource is applied.
`ADestY`	Top coordinate where the content in ASource is applied.
`ASourceX`	Left coordinate for the content in ASource applied in the method.
`ASourceY`	Top coordinate for the content in ASource applied in the method.
`ASourceWidth`	Width (in pixels) of the content in ASource applied in the method.
`ASourceHeight`	Height (in pixels) of the content in ASource applied in the method.

Description

This is a safer version for use where the destination pixels may not be consistent or valid. It will draw as if the target area contained opaque white pixels.

TLazCanvas.AlphaBlendIgnoringDestPixels procedure

Declaration

Arguments

Description

See also