type TDrawMode? = (dmOpaque, dmBlend, dmCustom, dmTransparent);
Gr32.TDrawMode? defines how the bitmap is combined with the background.
This is the type for DrawMode property of TBitmap32? class, and it is also passed as parameter in BlockTransfer? and StretchTransfer? functions.
- dmOpaque – a color information from the foreground image completely replaces the background data;
- dmBlend – foreground and background colors are blended together using per-pixel opacity of the foreground bitmap (stored in its alpha channel), multiplied by its MasterAlpha?;
- dmCustom – colors are mixed using OnPixelCombine? event, that is essentially a call-back function allowing for any custom blending routine.
- dmTransparent – color key transparency: any pixel that matches TBitmap32.OuterColor? is treated as transparent.
