From 31bdbe815bcf9c881569c7f2a48c8a5704807b13 Mon Sep 17 00:00:00 2001
From: Brandon Mathis <brandon@imathis.com>
Date: Fri, 17 Jul 2009 20:57:23 -0500
Subject: [PATCH] [Compass Core] New mixin: +opacity(amount). Provides
 cross-browser css opacity.

Amount should be between 0 and 1, where 0 is transparent and 1 is opaque.
---
 .../stylesheets/compass/utilities/_general.sass   |  1 +
 .../compass/utilities/general/_opacity.sass       | 15 +++++++++++++++
 2 files changed, 16 insertions(+)
 create mode 100644 frameworks/compass/stylesheets/compass/utilities/general/_opacity.sass

diff --git a/frameworks/compass/stylesheets/compass/utilities/_general.sass b/frameworks/compass/stylesheets/compass/utilities/_general.sass
index a09b235a..8e593fec 100644
--- a/frameworks/compass/stylesheets/compass/utilities/_general.sass
+++ b/frameworks/compass/stylesheets/compass/utilities/_general.sass
@@ -4,3 +4,4 @@
 @import general/tag_cloud.sass
 @import general/inline_block.sass
 @import general/hacks.sass
+@import general/opacity.sass
\ No newline at end of file
diff --git a/frameworks/compass/stylesheets/compass/utilities/general/_opacity.sass b/frameworks/compass/stylesheets/compass/utilities/general/_opacity.sass
new file mode 100644
index 00000000..04b85ec4
--- /dev/null
+++ b/frameworks/compass/stylesheets/compass/utilities/general/_opacity.sass
@@ -0,0 +1,15 @@
+// expects a number from 0 to 1
+=opacity(!opacity = 1)
+  :opacity= !opacity
+  :-moz-opacity= !opacity
+  :-khtml-opacity= !opacity
+  :-ms-filter= "progid:DXImageTransform.Microsoft.Alpha(Opacity=" + round(!opacity*100) + ")"
+  :filter= "alpha(opacity=" + round(!opacity*100) + ")"
+
+// Make an element completely transparent.
+=transparent
+  +opacity(0)
+
+// Make an element completely opaque.
+=opaque
+  +opacity(1)