BlendCh combines two channels by taking the sum of the two scaled channels, using the alpha value as the scale factor (c2 * (1-f) + c1 * f). The second channel is scaled by one minus the alpha value (1-f). For 8 bit channels, the actual equation used is: (((c1+1)*f)>>8)+(((c2+1)*(255-f))>>8).
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Parameters |
Description |
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unsigned c1 |
The first (the destination) of two channels that are combined to form the new value (return value). |
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unsigned c2 |
The second (the source) of two channels that are combined to form the new value (return value). |
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UByte factor |
An alpha value that is used as the factor ("f") in the blend operation. |
An UByte value formed by alpha blending the two channels using the factor (c2 * (1-f) + c1 * f).