eglfs: rework hooks design

There are two problems with the current design:
1. if (hooks) hooks->foo() doesn't work in debug mode when no platform hook
   is defined. The problem doesn't arise in release mode because the compiler
   optimizes away the if (hooks) into a no-op since hooks is NULL when no
   platform hook is defined.
2. Adding a new hook requires changing every platform's hook implementation.

New approach:
1. Define QEglFSHooks as a class with virtual functions. A stub file provides
   the default implementation.
2. Platform hooks derive from above class and reimplement whatever is needed.

The filenames and variables have been changed to be more in line with the
Qt style.

Change-Id: I2eaaa5ad7c8b48a06361c4747d4f210c428c983f
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/src/plugins/platforms/eglfs/eglfs.pro b/src/plugins/platforms/eglfs/eglfs.pro
index 9a36cacd05..421bbd5561 100644
--- a/src/plugins/platforms/eglfs/eglfs.pro
+++ b/src/plugins/platforms/eglfs/eglfs.pro
@@ -13,20 +13,21 @@ DESTDIR = $$QT.gui.plugins/platforms
 DEFINES += MESA_EGL_NO_X11_HEADERS
 
 #To test the hooks on x11 (xlib), comment the above define too
-#EGLFS_PLATFORM_HOOKS_SOURCES += qeglfs_hooks_x11.cpp
+#EGLFS_PLATFORM_HOOKS_SOURCES += qeglfshooks_x11.cpp
 #LIBS += -lX11
 
 SOURCES =   main.cpp \
             qeglfsintegration.cpp \
             qeglfswindow.cpp \
             qeglfsbackingstore.cpp \
-            qeglfsscreen.cpp
+            qeglfsscreen.cpp \
+            qeglfshooks_stub.cpp
 
 HEADERS =   qeglfsintegration.h \
             qeglfswindow.h \
             qeglfsbackingstore.h \
             qeglfsscreen.h \
-            qeglfs_hooks.h
+            qeglfshooks.h
 
 QMAKE_LFLAGS += $$QMAKE_LFLAGS_NOUNDEF