Allow theme colors to use the sRGB color profile

This is enabled by adding the following to your theme:

    colorSpaceName = sRGB;

The default color space used for themes is “Apple Generic RGB” which is a bad choice for interoperability with other software (e.g. exporting a theme to CSS, creating theme colors in Photoshop, and similar).

Related to issue #768.

Frameworks/theme/src/theme.cc

@@ -185,26 +185,40 @@ static CGColorRef OakColorCreateCopySoften (CGColorPtr cgColor, CGFloat factor)
 
 theme_t::shared_styles_t::shared_styles_t (bundles::item_ptr const& themeItem): _item(themeItem), _callback(*this)
 {
-	_color_space = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
 	setup_styles();
 	bundles::add_callback(&_callback);
 }
 
 theme_t::shared_styles_t::~shared_styles_t ()
 {
 	bundles::remove_callback(&_callback);
-	CGColorSpaceRelease(_color_space);
+	if(_color_space)
+		CGColorSpaceRelease(_color_space);
 }
 
 void theme_t::shared_styles_t::setup_styles ()
 {
 	_styles.clear();
 
+	if(_color_space)
+	{
+		CGColorSpaceRelease(_color_space);
+		_color_space = NULL;
+	}
+
 	if(_item)
 	{
 		if(bundles::item_ptr newItem = bundles::lookup(_item->uuid()))
 			_item = newItem;
 
+		std::string colorSpaceName;
+		if(plist::get_key_path(_item->plist(), "colorSpaceName", colorSpaceName) && colorSpaceName == "sRGB")
+		{
+			if(_color_space)
+				CGColorSpaceRelease(_color_space);
+			_color_space = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
+		}
+
 		plist::array_t items;
 		if(plist::get_key_path(_item->plist(), "settings", items))
 		{
@@ -224,6 +238,9 @@ void theme_t::shared_styles_t::setup_styles ()
 		}
 	}
 
+	if(!_color_space)
+		_color_space = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
+
 	// =======================================
 	// = Find “global” foreground/background =
 	// =======================================

Frameworks/theme/src/theme.h

@@ -121,7 +121,7 @@ struct PUBLIC theme_t
 		static decomposed_style_t parse_styles (plist::dictionary_t const& plist);
 
 		bundles::item_ptr _item;
-		CGColorSpaceRef _color_space;
+		CGColorSpaceRef _color_space = NULL;
 		std::vector<decomposed_style_t> _styles;
 		gutter_styles_t _gutter_styles;
 		CGColorPtr _foreground;