[Pharo-project] [COTDC] 11 - ColorMappingCanvas

laurent laffont laurent.laffont at gmail.com
Mon Feb 14 20:51:50 CET 2011


On Mon, Feb 14, 2011 at 7:57 PM, Igor Stasenko <siguctua at gmail.com> wrote:

> On 14 February 2011 18:45, laurent laffont <laurent.laffont at gmail.com>
> wrote:
> > Today:  ColorMappingCanvas
> >
>
> As far as i understood, this class is abstract, and its subclasses
> implement more specific behavior
> - shadow
> - semitransparency mapping
>
>
> The idea of is kind of canvas is to modify/filter the final output in
> rendering pipe..
> i.e., for each potential pixel operation like:
>
> source -> op -> output
>
> it introducing a color mapping stage:
>
> source -> op -> mapping -> output
>
>
> So, then for instance you could make a subclass which could turn all
> colors to be grayscale (disregarding that initial input was in
> colors).
>
> in fact i think this guy took wrong direction. It is much more
> effective to let the canvas to draw whatever it wants to some
> backup/temporary surface, and once it done, simply blit + color-map
> result to destination form using one, single strike.
>


ah ah, it seems last COTDC are:
- this class is bad written
- this is not used
- nobody understand

still lot of work ;)

Laurent



>
>
> --
> Best regards,
> Igor Stasenko AKA sig.
>
>
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