I just had a look into the source code,
libview/ev-transition-animation.c,
ev_transition_animation_fade :
paint_surface (cr, priv->origin_surface, 0, 0, 0, page_area);
paint_surface (cr, priv->dest_surface, 0, 0, progress, page_area);
ev_transition_animation_dissolve:
paint_surface (cr, priv->dest_surface, 0, 0, 0, page_area);
paint_surface (cr, priv->origin_surface, 0, 0, 1 - progress, page_area);
while in paint_surface there is
if (alpha == 0.)
cairo_paint (cr);
else
cairo_paint_with_alpha (cr, alpha);
I am not familiar with cairo, have never used it and could not find a manpage
for that function.
But I guess that progress is stepping from 0 to 1. And then ther's an error for
fade, because
when progress is 0, origin and dest are painted with both alpha=0 for fade,
while dissolve uses
alpha=0 and alpha=1 for the first step.
regards
regards
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