• Ell's avatar
    app: don't modify paint buffer when pasting to canvas · f24bca51
    Ell authored
    We now have enough machinery in gimppaintcore-loops to avoid
    modifying the paint buffer in gimp_paint_core_paste() in the no-
    applicator case, by using the same set of algorithms as
    gimp_paint_core_replace().  Other than reducing the number of
    different code paths we have, this is both more efficient, and
    allows us to reuse the paint buffer across dabs, as done in the
    following commits.
    
    Implement gimp_paint_core_replace() in terms of
    gimp_paint_core_paste().  We keep the two functions separate, since
    their implementation is still differnet when using an applicator.
    
    Suppress the paint-buffer-modifying algorithms in
    gimppaintcore-loops, but keep them around; using the same logic for
    normal painting as we use for REPLACE painting is possible due to
    the fact that all our current non-REPLACE modes treat alpha values
    and mask values interchangeably.  In the future we might have modes
    that distinguish between alpha and mask values, requiring the old
    algorithms.
    f24bca51
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