2003-07-16 Michael Natterer <mitch@gimp.org>
* app/paint/gimppaintoptions.[ch]: added utility function
gimp_paint_options_get_fade() which calculates an opacity
value from paint_core->pixel_dist.
* app/paint/gimppaintbrush.c: removed the same code here and use
gimp_paint_options_get_fade().
* app/paint/gimpclone.c
* app/paint/gimpconvolve.c
* app/paint/gimpdodgeburn.c
* app/paint/gimperaser.c
* app/paint/gimpsmudge.c: enabled fade for all paint tools, along
with a general opacity cleanup:
Use the opacity from gimp_context_get_opacity() *only* for the
image_opacity. In particular, *never* use it as initial value for
calculating the brush_opacity. Instead, start calculating the
brush_opacity from gimp_paint_options_get_fade() and return early
if it returns 0.0, if not, multiply tool specific opacity sources
like the current pressure.
(This changes the effect of the paint tools for particular opacity
values, but makes the impact of opacity on the final rendering
linear and more intuitive)
* app/tools/gimppaintoptions-gui.c: enabled the "Fade" frame for
the tools above.
* app/paint/gimppaintcore.c: purely cosmetic cleanup.
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