[gtk+] Refactor to use API that's available in OS X 10.4 as well

[Kristian Rietveld <kristian src gnome org>]

commit 64f11c366aae4b0d38bcd632ed75a55027667c81
Author: Kristian Rietveld <kris gtk org>
Date:   Sun Jun 27 10:22:36 2010 +0200

    Refactor to use API that's available in OS X 10.4 as well
    
    (cherry picked from commit 3770d914ec3ac30248f8d187ccc9f5369d3a5fcc)

 gdk/quartz/gdkcolor-quartz.c |   26 ++++++++++++++++----------
 1 files changed, 16 insertions(+), 10 deletions(-)
---
diff --git a/gdk/quartz/gdkcolor-quartz.c b/gdk/quartz/gdkcolor-quartz.c
index 7afcf2c..315dd28 100644
--- a/gdk/quartz/gdkcolor-quartz.c
+++ b/gdk/quartz/gdkcolor-quartz.c
@@ -167,8 +167,9 @@ CGColorRef
 _gdk_quartz_colormap_get_cgcolor_from_pixel (GdkDrawable *drawable,
                                              guint32      pixel)
 {
-  CGFloat r, g, b, a;
+  CGFloat components[4] = { 0.0f, };
   CGColorRef color;
+  CGColorSpaceRef colorspace;
   const GdkVisual *visual;
   GdkColormap *colormap;
 
@@ -182,25 +183,30 @@ _gdk_quartz_colormap_get_cgcolor_from_pixel (GdkDrawable *drawable,
     {
       case GDK_VISUAL_STATIC_GRAY:
       case GDK_VISUAL_GRAYSCALE:
-        g = (pixel & 0xff) / 255.0f;
+        components[0] = (pixel & 0xff) / 255.0f;
 
         if (visual->depth == 1)
-          g = g == 0.0f ? 0.0f : 1.0f;
+          components[0] = components[0] == 0.0f ? 0.0f : 1.0f;
+        components[1] = 1.0f;
 
-        color = CGColorCreateGenericGray (g, 1.0f);
+        colorspace = CGColorSpaceCreateWithName (kCGColorSpaceGenericGray);
+        color = CGColorCreate (colorspace, components);
+        CGColorSpaceRelease (colorspace);
         break;
 
       default:
-        r = (pixel >> 16 & 0xff) / 255.0;
-        g = (pixel >> 8  & 0xff) / 255.0;
-        b = (pixel       & 0xff) / 255.0;
+        components[0] = (pixel >> 16 & 0xff) / 255.0;
+        components[1] = (pixel >> 8  & 0xff) / 255.0;
+        components[2] = (pixel       & 0xff) / 255.0;
 
         if (visual->depth == 32)
-          a = (pixel >> 24 & 0xff) / 255.0;
+          components[3] = (pixel >> 24 & 0xff) / 255.0;
         else
-          a = 1.0;
+          components[3] = 1.0;
 
-        color = CGColorCreateGenericRGB (r, g, b, a);
+        colorspace = CGColorSpaceCreateWithName (kCGColorSpaceGenericRGB);
+        color = CGColorCreate (colorspace, components);
+        CGColorSpaceRelease (colorspace);
         break;
     }