From 142abce46a18ef09ca77ed581cf3b385671c9515 Mon Sep 17 00:00:00 2001 From: Benjamin Otte Date: Fri, 26 Jun 2015 20:53:39 +0200 Subject: [PATCH] cssvalue: Special case resulting color for transparency Again, preparation for using premultiplied color transitions. --- gtk/gtkcssrgbavalue.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/gtk/gtkcssrgbavalue.c b/gtk/gtkcssrgbavalue.c index ee73a458f0..0b66f8a113 100644 --- a/gtk/gtkcssrgbavalue.c +++ b/gtk/gtkcssrgbavalue.c @@ -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); - 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); + 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); }