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Adapt to premultiplied alpha usage in Cogl

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Cogl's default blend function has been switched to expect premultiplied
alpha. Change the combine function and the colors we use to
modulate alpha to match.

http://bugzilla.gnome.org/show_bug.cgi?id=585480
This commit is contained in:
Owen W. Taylor 2009-06-11 15:33:05 -04:00
parent 7eae5d4eab
commit 442991a712
2 changed files with 9 additions and 7 deletions
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14
src/compositor/mutter/mutter-shaped-texture.c
View File

@ -283,8 +283,7 @@ mutter_shaped_texture_paint (ClutterActor *actor)
priv->material = cogl_material_new ();
cogl_material_set_layer_combine (priv->material, 1,
"RGB = REPLACE (PREVIOUS)"
"A = MODULATE (PREVIOUS, TEXTURE)",
"RGBA = MODULATE (PREVIOUS, TEXTURE[A])",
NULL);
}
material = priv->material;
@ -305,9 +304,12 @@ mutter_shaped_texture_paint (ClutterActor *actor)
{
material = priv->material_workaround = cogl_material_new ();
cogl_material_set_layer_combine (material, 0,
"RGB = MODULATE (TEXTURE, PREVIOUS)"
"A = REPLACE (PREVIOUS)",
NULL);
cogl_material_set_layer_combine (material, 1,
"RGB = REPLACE (PREVIOUS)"
"A = MODULATE (PRIMARY, TEXTURE)",
"RGBA = MODULATE (PREVIOUS, TEXTURE[A])",
NULL);
}
@ -320,8 +322,8 @@ mutter_shaped_texture_paint (ClutterActor *actor)
{
CoglColor color;
cogl_color_set_from_4ub (&color, 255, 255, 255,
clutter_actor_get_paint_opacity (actor));
guchar opacity = clutter_actor_get_paint_opacity (actor);
cogl_color_set_from_4ub (&color, opacity, opacity, opacity, opacity);
cogl_material_set_color (material, &color);
}

2
src/compositor/mutter/tidy/tidy-texture-frame.c
View File

@ -210,7 +210,7 @@ tidy_texture_frame_paint (ClutterActor *self)
g_assert (priv->material != COGL_INVALID_HANDLE);
/* set the source material using the parent texture's COGL handle */
cogl_material_set_color4ub (priv->material, 255, 255, 255, opacity);
cogl_material_set_color4ub (priv->material, opacity, opacity, opacity, opacity);
cogl_material_set_layer (priv->material, 0, cogl_texture);
cogl_set_source (priv->material);