bug#9175: [PATCH] 24.0.50: Images colors on NextStep do not default correctly

[Alp Aker <alptekin.aker@gmail.com>]

Image types that support :foreground and :background keywords in their
image descriptors are supposed to default to the frame foreground and
background colors when the relevant colors aren't specified.  On NS,
however, these default to black.  An easy test case is provided by
visiting a mono PBM image file (such as etc/images/splash.pbm) in
image-mode; what one will see is simply a black square.

Diagnostic: The image loading functions in image.c take the default
colors from the frame's foreground_pixel and background_pixel fields,
but on NS the relevant frame parameter handlers don't set those
fields.  The following patch corrects that.

2011-07-25  Alp Aker  <alp.tekin.aker@gmail.com>

	* nsfns.m (x_set_foreground_color): Set f->foreground_pixel when
	setting frame foreground color.
	(x_set_background_color): Likewise.

=== modified file 'src/nsfns.m'
--- src/nsfns.m	2011-07-08 15:39:40 +0000
+++ src/nsfns.m	2011-07-25 17:22:05 +0000
@@ -321,6 +321,7 @@
 x_set_foreground_color (struct frame *f, Lisp_Object arg, Lisp_Object oldval)
 {
   NSColor *col;
+  CGFloat r, g, b, alpha;

   if (ns_lisp_to_color (arg, &col))
     {
@@ -332,6 +333,10 @@
   [f->output_data.ns->foreground_color release];
   f->output_data.ns->foreground_color = col;

+  [col getRed: &r green: &g blue: &b alpha: &alpha];
+  FRAME_FOREGROUND_PIXEL (f) =
+    ARGB_TO_ULONG ((int)(alpha*0xff), (int)(r*0xff), (int)(g*0xff),
(int)(b*0xff));
+
   if (FRAME_NS_VIEW (f))
     {
       update_face_from_frame_parameter (f, Qforeground_color, arg);
@@ -348,7 +353,7 @@
   struct face *face;
   NSColor *col;
   NSView *view = FRAME_NS_VIEW (f);
-  float alpha;
+  CGFloat r, g, b, alpha;

   if (ns_lisp_to_color (arg, &col))
     {
@@ -364,10 +369,14 @@
   [col retain];
   [f->output_data.ns->background_color release];
   f->output_data.ns->background_color = col;
+
+  [col getRed: &r green: &g blue: &b alpha: &alpha];
+  FRAME_BACKGROUND_PIXEL (f) =
+    ARGB_TO_ULONG ((int)(alpha*0xff), (int)(r*0xff), (int)(g*0xff),
(int)(b*0xff));
+
   if (view != nil)
     {
       [[view window] setBackgroundColor: col];
-      alpha = [col alphaComponent];

       if (alpha != 1.0)
           [[view window] setOpaque: NO];