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CDrawingManager::PixelAlpha

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Calculates the final color for a semitransparent pixel.

static COLORREF __stdcall PixelAlpha(
   COLORREF srcPixel,
   int percent
);

static COLORREF __stdcall PixelAlpha(
   COLORREF srcPixel,
   double percentR,
   double percentG,
   double percentB
);

static COLORREF __stdcall PixelAlpha(
   COLORREF srcPixel,
   COLORREF dstPixel,
   int percent
);

Parameters

  • [in] srcPixel
    The initial color for the pixel.

  • [in] percent
    A number between 0 and 100 that represents the percentage of transparency. A value of 100 indicates that the initial color is completely transparent.

  • [in] percentR
    A number between 0 and 100 that represents the percentage of transparency for the red component.

  • [in] percentG
    A number between 0 and 100 that represents the percentage of transparency for the green component.

  • [in] percentB
    A number between 0 and 100 that represents the percentage of transparency for the blue component.

  • [in] dstPixel
    The base color for the pixel.

Return Value

The final color for the semitransparent pixel.

Remarks

This is a helper class for coloring semitransparent bitmaps and is not designed to be called directly by the programmer.

When you use the version of the method that has dstPixel, the final color is a combination of dstPixel and srcPixel. The srcPixel color is the partially transparent color over the base color of dstPixel.

Requirements

Header: afxdrawmanager.h

See Also

Reference

CDrawingManager Class

Hierarchy Chart