Authors: Andrew Lewycky <andrew@transgaming.com>, Gavriel State <gav@transgaming.com>, Ove Kaaven <ovek@transgaming.com>
Major DirectDraw restructure/reimplementation, using an improved component
object model hierarchy. The implementation currently supports:
- DirectDraw over GDI/USER in a window (using DIBsections and
asynchronous updates)
- XVidMode
- XF86DGA2
- All DirectDraw interfaces from versions 1 to 7 (at least in theory)
- Hooks for Direct3D interfaces
diff --git a/dlls/ddraw/ddcomimpl.h b/dlls/ddraw/ddcomimpl.h
new file mode 100644
index 0000000..da4afd8
--- /dev/null
+++ b/dlls/ddraw/ddcomimpl.h
@@ -0,0 +1,39 @@
+/* A few helpful macros for implementing COM objects.
+ *
+ * Copyright 2000 TransGaming Technologies Inc.
+ */
+
+#include <stddef.h>
+
+/* Generates the name for a vtable pointer for a given interface. */
+/* The canonical name for a single interface is "lpVtbl". */
+#define ICOM_VFIELD_MULTI_NAME2(iface) ITF_##iface
+#define ICOM_VFIELD_MULTI_NAME(iface) ICOM_VFIELD_MULTI_NAME2(iface)
+
+/* Declares a vtable pointer field in an implementation. */
+#define ICOM_VFIELD_MULTI(iface) \
+ iface ICOM_VFIELD_MULTI_NAME(iface)
+
+/* Returns the offset of a vtable pointer within an implementation object. */
+#define ICOM_VFIELD_OFFSET(impltype, iface) \
+ offsetof(impltype, ICOM_VFIELD_MULTI_NAME(iface))
+
+/* Given an interface pointer, returns the implementation pointer. */
+#define ICOM_OBJECT(impltype, ifacename, ifaceptr) \
+ (impltype*)((ifaceptr) == NULL ? NULL \
+ : (char*)(ifaceptr) - ICOM_VFIELD_OFFSET(impltype,ifacename))
+
+#define ICOM_THIS_FROM(impltype, ifacename, ifaceptr) \
+ impltype* This = ICOM_OBJECT(impltype, ifacename, ifaceptr)
+
+/* Given an object and interface name, returns a pointer to that interface. */
+#define ICOM_INTERFACE(implobj, iface) \
+ (&((implobj)->ICOM_VFIELD_MULTI_NAME(iface)))
+
+#define ICOM_INIT_INTERFACE(implobj, ifacename, vtblname) \
+ do { \
+ (implobj)->ICOM_VFIELD_MULTI_NAME(ifacename).lpVtbl = &(vtblname); \
+ } while (0)
+
+#define COM_INTERFACE_CAST(impltype, ifnamefrom, ifnameto, ifaceptr) \
+ ICOM_INTERFACE(ICOM_OBJECT(impltype, ifnamefrom, ifaceptr), ifnameto)
