Hello All!
I'm looking at the Layer Modes for the Glossary and one of my references
is the C source code. I have a question about it which is mainly aimed
at any technically-oriented people (developers) on the list.
In app/composite/composite-generic.c, the comments for the function
gimp_composite_overlay_any_any_any_generic() say:
* Perform an RGB[A] overlay operation between the pixel sources
* ctx->A and ctx->B, using the generalised algorithm:
*
* D = A * (B + (2 * B) * (255 - A))
But the code does:
dest[b] = INT_MULT(src1[b], src1[b] + INT_MULT(2 * src2[b], 255 -
src1[b], tmpM), tmp);
which looks to me like:
D = A * (A + (2 * B) * (255 - A))
Is this an error in the code, or simply an error in the comment, does
anyone know?
Thank you!
Sally
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