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brightness-contrast-effect: Don't actually run if it will have no effect

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Don't run the shader and redirect to an FBO if it won't actually do anything.
This saves us on resources a ton.

https://bugzilla.gnome.org/show_bug.cgi?id=683066
This commit is contained in:
Jasper St. Pierre 2012-08-30 16:48:44 -03:00
parent b2b22dbe6c
commit 38b82cb22c
1 changed files with 14 additions and 0 deletions
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14
clutter/clutter-brightness-contrast-effect.c
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@ -120,6 +120,17 @@ G_DEFINE_TYPE (ClutterBrightnessContrastEffect,
clutter_brightness_contrast_effect,
CLUTTER_TYPE_OFFSCREEN_EFFECT);
static gboolean
will_have_no_effect (ClutterBrightnessContrastEffect *self)
{
return (self->brightness_red == no_change &&
self->brightness_green == no_change &&
self->brightness_blue == no_change &&
self->contrast_red == no_change &&
self->contrast_green == no_change &&
self->contrast_blue == no_change);
}
static gboolean
clutter_brightness_contrast_effect_pre_paint (ClutterEffect *effect)
{
@ -129,6 +140,9 @@ clutter_brightness_contrast_effect_pre_paint (ClutterEffect *effect)
if (!clutter_actor_meta_get_enabled (CLUTTER_ACTOR_META (effect)))
return FALSE;
if (will_have_no_effect (self))
return FALSE;
if (!clutter_feature_available (CLUTTER_FEATURE_SHADERS_GLSL))
{
/* if we don't have support for GLSL shaders then we