libcamera: Drop the LIBCAMERA_D_PTR macro in favour of the _d() function

Now that all Extensible classes expose a _d() function that performs
appropriate casts, the LIBCAMERA_D_PTR brings no real additional value.
Replace it with direct calls to the _d() function.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

src/libcamera/base/class.cpp

@@ -94,23 +94,12 @@ namespace libcamera {
  * name passed as the \a klass parameter.
  */
 
-/**
- * \def LIBCAMERA_D_PTR()
- * \brief Retrieve the private data pointer
- *
- * This macro can be used in any member function of a class that inherits,
- * directly or indirectly, from the Extensible class, to create a local
- * variable named 'd' that points to the class' private data instance.
- */
-
 /**
  * \def LIBCAMERA_O_PTR()
  * \brief Retrieve the public instance corresponding to the private data
  *
- * This macro is the counterpart of LIBCAMERA_D_PTR() for private data classes.
- * It can be used in any member function of the private data class to create a
- * local variable named 'o' that points to the public class instance
- * corresponding to the private data.
+ * This macro is used in any member function of the private data class to access
+ * the public class instance corresponding to the private data.
  */
 
 /**
@@ -148,6 +137,8 @@ namespace libcamera {
  * class need to be qualified with appropriate access specifiers. The
  * PublicClass and Private classes always have full access to each other's
  * protected and private members.
+ *
+ * The PublicClass exposes its Private data pointer through the _d() function.
  */
 
 /**