Re: CAIRO_OPERATOR_ADD question
Bill Spitzak <[email protected]>
| Newsgroups | gmane.comp.lib.cairo |
|---|---|
| Message-ID | <[email protected]> |
The results are clamped to the range the destination surface can represent. So if your image is 8-bit where 255 represents 1.0, then 2.0 will be stored as the largest value it can, which is 1.0. S Boucher wrote: > I'm looking at http://cairographics.org/operators/ for CAIRO_OPERATOR_ADD. > > I wonder whether the formulas are written correctly. > > My reading of it is: > > src: rgba(1, 0, 0, 1) > OPERATOR_ADD > dst: rgba(1, 0, 0, 1) > RESULT: rgba(2,0,0,1). > > i.e. the red is 200%. > > But that can't fit in a CAIRO_FORMAT_ARGB32 > > What am I missing? > > Thanks > > > ------------------------------------------------------------------------ > > -- > cairo mailing list > [email protected] > http://lists.cairographics.org/mailman/listinfo/cairo -- cairo mailing list [email protected] http://lists.cairographics.org/mailman/listinfo/cairo