RGBA (Compact 7)
3/12/2014
This macro selects a color based on the specified color values, the alpha value, and the capabilities of the output device.
Syntax
COLORREF RGBA(
BYTE byRed,
BYTE byGreen,
BYTE byBlue,
BYTE alpha
);
Parameters
- byRed
Specifies the intensity of the red color.
- byGreen
Specifies the intensity of the green color.
- byBlue
Specifies the intensity of the blue color.
- alpha
Specifies the alpha component of the overall color.
Return Value
The return value is a COLORREF that corresponds to the supplied color and alpha values.
Remarks
The intensity for each argument is in the range 0 through 255.
If all three intensities are zero, the result is black.
If all three intensities are 255, the result is white.
For information about using color values in a color palette, see the description of the PALETTERGB macro.
The RGBA macro is defined as follows:
#ifndef RGBA
#define RGBA(r,g,b,a) ((COLORREF)( (((DWORD)(BYTE)(a))<<24) | RGB(r,g,b) ))
#endif
Requirements
Header |
windows.h |