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cssvalue: Special case resulting color for transparency

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Again, preparation for using premultiplied color transitions.
This commit is contained in:
Benjamin Otte 2015-06-26 20:53:39 +02:00
parent e3d8f03b3a
commit 142abce46a
1 changed files with 10 additions and 3 deletions
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7
gtk/gtkcssrgbavalue.c
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@ -68,9 +68,16 @@ gtk_css_value_rgba_transition (GtkCssValue *start,
progress = CLAMP (progress, 0, 1);
result.alpha = transition (start->rgba.alpha, end->rgba.alpha, progress);
if (result.alpha <= 0.0)
{
result.red = result.green = result.blue = 0.0;
}
else
{
result.red = transition (start->rgba.red, end->rgba.red, progress);
result.green = transition (start->rgba.green, end->rgba.green, progress);
result.blue = transition (start->rgba.blue, end->rgba.blue, progress);
}
return _gtk_css_rgba_value_new_from_rgba (&result);
}