untangle the egl-x11 relationship in the build system

egl-x11 is used in two places:
- the eglfs-x11 plugin, which has a hard dependency on xcb-xlib
- the xcb-egl plugin, which has a soft dependency on xcb-xlib

that means that the egl-x11 configure test needs to be untangled from
xcb, and that eglfs-x11 should be a separate feature with a proper
dependency declaration.

when the plugins that need egl-x11 are not built, it also makes no sense
to build the respective integration in the egl_support module (even if
it's possible to coax it into building), so adjust things accordingly.

Change-Id: Ic729d0b7c893dd00844567329205c24ea2703033
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>

src/gui/configure.json

@@ -715,7 +715,7 @@
                     "// window and pixmap types will be different than what an X-based platform",
                     "// plugin would expect."
                 ],
-                "include": [ "EGL/egl.h", "xcb/xcb.h", "X11/Xlib.h", "X11/Xlib-xcb.h" ],
+                "include": [ "EGL/egl.h", "X11/Xlib.h" ],
                 "main": [
                     "Display *dpy = EGL_DEFAULT_DISPLAY;",
                     "EGLNativeDisplayType egldpy = XOpenDisplay(\"\");",
@@ -725,7 +725,7 @@
                     "XCloseDisplay(dpy);"
                 ]
             },
-            "use": "egl xcb_xlib"
+            "use": "egl xlib"
         },
         "egl-brcm": {
             "label": "Broadcom EGL (Raspberry Pi)",
@@ -1229,6 +1229,11 @@
             "condition": "config.integrity && features.eglfs && tests.egl-openwfd",
             "output": [ "privateFeature" ]
         },
+        "eglfs_x11": {
+            "label": "EGLFS X11",
+            "condition": "features.eglfs && features.xcb && features.xcb-xlib && features.egl_x11",
+            "output": [ "privateFeature" ]
+        },
         "gif": {
             "label": "GIF",
             "condition": "features.imageformatplugin",
@@ -1709,7 +1714,7 @@ QMAKE_LIBDIR_OPENGL[_ES2] and QMAKE_LIBS_OPENGL[_ES2] in the mkspec for your pla
                     "section": "EGLFS details",
                     "condition": "features.eglfs",
                     "entries": [
-                        "eglfs_openwfd", "eglfs_viv", "eglfs_viv_wl", "eglfs_rcar", "eglfs_egldevice", "eglfs_gbm", "eglfs_vsp2", "eglfs_mali", "eglfs_brcm", "egl_x11"
+                        "eglfs_openwfd", "eglfs_viv", "eglfs_viv_wl", "eglfs_rcar", "eglfs_egldevice", "eglfs_gbm", "eglfs_vsp2", "eglfs_mali", "eglfs_brcm", "eglfs_x11"
                     ]
                 },
                 "linuxfb", "vnc", "mirclient",

src/platformsupport/eglconvenience/eglconvenience.pro

@@ -26,15 +26,15 @@ qtConfig(opengl) {
         qeglpbuffer.cpp
 }
 
-# Avoid X11 header collision, use generic EGL native types
-DEFINES += QT_EGL_NO_X11
-
-qtConfig(xlib) {
+qtConfig(egl_x11) {
     HEADERS += \
         qxlibeglintegration_p.h
     SOURCES += \
         qxlibeglintegration.cpp
     QMAKE_USE_PRIVATE += xlib
+} else {
+    # Avoid X11 header collision, use generic EGL native types
+    DEFINES += QT_EGL_NO_X11
 }
 CONFIG += egl
 

src/plugins/platforms/eglfs/deviceintegration/deviceintegration.pro

@@ -1,7 +1,7 @@
 TEMPLATE = subdirs
 QT_FOR_CONFIG += gui-private
 
-qtConfig(egl_x11): SUBDIRS += eglfs_x11
+qtConfig(eglfs_x11): SUBDIRS += eglfs_x11
 qtConfig(eglfs_gbm): SUBDIRS *= eglfs_kms_support eglfs_kms
 qtConfig(eglfs_egldevice): SUBDIRS *= eglfs_kms_support eglfs_kms_egldevice
 qtConfig(eglfs_vsp2): SUBDIRS += eglfs_kms_vsp2