High-level pixel access methods

[Patrick Julien]

On February 15, 2004 07:55 am, Boudewijn Rempt wrote:
> On Sunday 15 February 2004 13:25, Boudewijn Rempt wrote:
> > In KisPainter::computeDab, I take the alpha mask from a brush (but it
> > would be the same with the QImage of a brush) and create a temporary
> > layer that I can composite with any of the implemented composite ops onto
> > the target layer. This is what I do:
> >
> >         m_dab = new KisLayer(mask -> width(),
> >                              mask -> height(),
> >                              m_device -> typeWithAlpha(),
> >                              "dab");
> >         m_dab -> setOpacity(OPACITY_TRANSPARENT);
> >         for (int y = 0; y < mask -> height(); y++) {
> >                 for (int x = 0; x < mask -> width(); x++) {
> >                         m_dab -> setPixel(x, y, m_paintColor, mask ->
> > alphaAt(x, y));
> >                 }
> >         }
>
> Hm. A temporary solution for this would perhaps be to add constructors to
> KisPaintDevice with QImage, KisAlphaBuffer and other buffers with image
> data, and hidden inside KisPaintdevice fill KisPixelData -- that would
> prevent multiple calls to setPixel at the expense of adding a new
> constructor for every type of image data I would like to convert to a paint
> device.

Well, the problem with that is that it will almost certainly fail with 
medium/large images has you need one large buffer to hold all the pixels.