Allow disabling the SHAPE extension at runtime

To correctly render a window making use of SHAPE, a compositor
must query the shape rectangles. This may not be a desirable
feature for a Wayland compositor. Allow SHAPE to be turned off at
runtime, so that the compositor can opt-out.

Signed-off-by: Simon Ser <contact@emersion.fr>

include/extinit.h

@@ -108,6 +108,7 @@ extern _X_EXPORT Bool noScreenSaverExtension;
 extern void ScreenSaverExtensionInit(void);
 #endif
 
+extern _X_EXPORT Bool noShapeExtension;
 extern void ShapeExtensionInit(void);
 
 #ifdef MITSHM

mi/miinitext.c

@@ -109,7 +109,7 @@ SOFTWARE.
 /* List of built-in (statically linked) extensions */
 static const ExtensionModule staticExtensions[] = {
     {GEExtensionInit, "Generic Event Extension", &noGEExtension},
-    {ShapeExtensionInit, "SHAPE", NULL},
+    {ShapeExtensionInit, "SHAPE", &noShapeExtension},
 #ifdef MITSHM
     {ShmExtensionInit, "MIT-SHM", &noMITShmExtension},
 #endif

os/utils.c

@@ -143,6 +143,7 @@ Bool noMITShmExtension = FALSE;
 Bool noRRExtension = FALSE;
 #endif
 Bool noRenderExtension = FALSE;
+Bool noShapeExtension = FALSE;
 
 #ifdef XCSECURITY
 Bool noSecurityExtension = FALSE;