plan for merging

[Boudewijn Rempt]

On Fri, 7 Jan 2005, Casper Boemann wrote:

> Ok I see, and readPixelData is gone, but we could do as you say and just
> read into a buffer.

There are other places where we need an efficient way to get directly at
a block of pixels, mandated by external libraries. lcms is one of those:
it's far more efficient to throw complete tiles at the transform function
that prepares the colours for display than do it pixel by pixel.