JCL Help:TJclBitmap32.MasterAlpha
JCL Help: TJclBitmap32.MasterAlpha Property
Search in JCL Help
Search in all projects
Summary
Specifies an alpha blending factor applied to the bitmap as a whole.
Pascal
published property MasterAlpha: Byte;
Description
When blending a bitmap to the screen or to another bitmap, MasterAlpha normally controls the blending factor. The per-pixel opacity, stored in the blended bitmap, is premultiplied with MasterAlpha. If the MasterAlpha property is $00, the bitmap will be fully transparent, if it is equal to $FF, only per-pixel opacity, stored in bitmap’s alpha channel is used. This property is used only for bitmap blending, it does not affect pixel/line drawing and other similar routines. When blending bitmaps in dmCustom draw mode, this property may be used for other purposes. Custom combining routine may use all 32 bits of MasterAlpha. If the bitmap is in dmBlend draw mode and MasterAlpha is not in the [0…255] range, the blending result is not specified, it is your responsibility to keep MasterAlpha consistent with current draw mode.
See Also
TJclBitmap32.DrawMode TColor32
About
Donator
Alex Denissov
Contribute to this help topic
This documentation wiki is based on the collaborative effort of Project JEDI users. Your edits are welcome in order to improve documentation quality: edit this page
