Qt5 compatibility

This commit squashes all the changes in the Qt5 branch
relative to master.

Backward compatibility with Qt4 is retained.

Original authors:

- Philip Kaufmann <phil.kaufmann@t-online.de>
- Jonas Schnelli <jonas.schnelli@include7.ch>

src/qt/macdockiconhandler.mm

@@ -2,8 +2,8 @@
 
 #include <QMenu>
 #include <QWidget>
-
-extern void qt_mac_set_dock_menu(QMenu*);
+#include <QTemporaryFile>
+#include <QImageWriter>
 
 #undef slots
 #include <Cocoa/Cocoa.h>
@@ -47,11 +47,11 @@ extern void qt_mac_set_dock_menu(QMenu*);
 MacDockIconHandler::MacDockIconHandler() : QObject()
 {
     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
-    this->m_dockIconClickEventHandler = [[DockIconClickEventHandler alloc] initWithDockIconHandler:this];
 
+    this->m_dockIconClickEventHandler = [[DockIconClickEventHandler alloc] initWithDockIconHandler:this];
     this->m_dummyWidget = new QWidget();
     this->m_dockMenu = new QMenu(this->m_dummyWidget);
-    qt_mac_set_dock_menu(this->m_dockMenu);
+
     [pool release];
 }
 
@@ -74,15 +74,29 @@ QMenu *MacDockIconHandler::dockMenu()
 void MacDockIconHandler::setIcon(const QIcon &icon)
 {
     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
-    NSImage *image;
+    NSImage *image = nil;
     if (icon.isNull())
         image = [[NSImage imageNamed:@"NSApplicationIcon"] retain];
     else {
+        // generate NSImage from QIcon and use this as dock icon.
         QSize size = icon.actualSize(QSize(128, 128));
         QPixmap pixmap = icon.pixmap(size);
-        CGImageRef cgImage = pixmap.toMacCGImageRef();
-        image = [[NSImage alloc] initWithCGImage:cgImage size:NSZeroSize];
-        CFRelease(cgImage);
+
+        // write temp file hack (could also be done through QIODevice [memory])
+        QTemporaryFile notificationIconFile;
+        if (!pixmap.isNull() && notificationIconFile.open()) {
+            QImageWriter writer(&notificationIconFile, "PNG");
+            if (writer.write(pixmap.toImage())) {
+                const char *cString = notificationIconFile.fileName().toUtf8().data();
+                NSString *macString = [NSString stringWithCString:cString encoding:NSUTF8StringEncoding];
+                image =  [[NSImage alloc] initWithContentsOfFile:macString];
+            }
+        }
+
+        if(!image) {
+            // if testnet image could not be created, load std. app icon
+            image = [[NSImage imageNamed:@"NSApplicationIcon"] retain];
+        }
     }
 
     [NSApp setApplicationIconImage:image];