dix: move screen destruction loop into dixFreeAllScreens()

Consolidate the screen destruction code in its own function and
so move it out of the big main loop.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

dix/dix_priv.h

@@ -255,4 +255,6 @@ extern Bool enableBackingStore;
 /* in generated BuiltInAtoms.c */
 void MakePredeclaredAtoms(void);
 
+void dixFreeAllScreens(void);
+
 #endif /* _XSERVER_DIX_PRIV_H */

dix/gc.c

@@ -768,6 +768,8 @@ int
 FreeGC(void *value, XID gid)
 {
     GCPtr pGC = (GCPtr) value;
+    if (!pGC)
+        return BadMatch;
 
     CloseFont(pGC->font, (Font) 0);
     if (pGC->funcs)
@@ -819,13 +821,14 @@ CreateScratchGC(ScreenPtr pScreen, unsigned depth)
 }
 
 void
-FreeGCperDepth(int screenNum)
+FreeGCperDepth(ScreenPtr pScreen)
 {
     int i;
-    ScreenPtr pScreen;
     GCPtr *ppGC;
 
-    pScreen = screenInfo.screens[screenNum];
+    if (!pScreen)
+        return;
+
     ppGC = pScreen->GCperDepth;
 
     for (i = 0; i <= pScreen->numDepths; i++) {
@@ -900,13 +903,6 @@ CreateDefaultStipple(int screenNum)
     return TRUE;
 }
 
-void
-FreeDefaultStipple(int screenNum)
-{
-    ScreenPtr pScreen = screenInfo.screens[screenNum];
-    dixDestroyPixmap(pScreen->defaultStipple, 0);
-}
-
 int
 SetDashes(GCPtr pGC, unsigned offset, unsigned ndash, unsigned char *pdash)
 {

dix/gc_priv.h

@@ -22,14 +22,12 @@ int CopyGC(GCPtr pgcSrc, GCPtr pgcDst, BITS32 mask);
 
 int FreeGC(void *pGC, XID gid);
 
-void FreeGCperDepth(int screenNum);
+void FreeGCperDepth(ScreenPtr pScreen);
 
 Bool CreateGCperDepth(int screenNum);
 
 Bool CreateDefaultStipple(int screenNum);
 
-void FreeDefaultStipple(int screenNum);
-
 int SetDashes(GCPtr pGC, unsigned offset, unsigned ndash, unsigned char *pdash);
 
 int VerifyRectOrder(int nrects, xRectangle *prects, int ordering);

dix/main.c

@@ -314,27 +314,8 @@ dix_main(int argc, char *argv[], char *envp[])
             screenInfo.screens[i]->root = NullWindow;
 
         CloseDownDevices();
-
         CloseDownEvents();
-
-        for (i = screenInfo.numGPUScreens - 1; i >= 0; i--) {
-            ScreenPtr pScreen = screenInfo.gpuscreens[i];
-            dixFreeScreenSpecificPrivates(pScreen);
-            (*pScreen->CloseScreen) (pScreen);
-            dixFreePrivates(pScreen->devPrivates, PRIVATE_SCREEN);
-            free(pScreen);
-            screenInfo.numGPUScreens = i;
-        }
-
-        for (i = screenInfo.numScreens - 1; i >= 0; i--) {
-            FreeGCperDepth(i);
-            FreeDefaultStipple(i);
-            dixFreeScreenSpecificPrivates(screenInfo.screens[i]);
-            (*screenInfo.screens[i]->CloseScreen) (screenInfo.screens[i]);
-            dixFreePrivates(screenInfo.screens[i]->devPrivates, PRIVATE_SCREEN);
-            free(screenInfo.screens[i]);
-            screenInfo.numScreens = i;
-        }
+        dixFreeAllScreens();
 
         ReleaseClientIds(serverClient);
         dixFreePrivates(serverClient->devPrivates, PRIVATE_CLIENT);

dix/meson.build

@@ -28,6 +28,7 @@ srcs_dix = [
     'registry.c',
     'resource.c',
     'selection.c',
+    'screen.c',
     'swaprep.c',
     'swapreq.c',
     'tables.c',

dix/screen.c

@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: MIT OR X11
+ *
+ * Copyright © 2024 Enrico Weigelt, metux IT consult <info@metux.net>
+ */
+#include <dix-config.h>
+
+#include "dix/dix_priv.h"
+#include "dix/gc_priv.h"
+#include "include/screenint.h"
+#include "include/scrnintstr.h"
+
+static void dixFreeScreen(ScreenPtr pScreen)
+{
+    if (!pScreen)
+        return;
+
+    FreeGCperDepth(pScreen);
+    dixDestroyPixmap(pScreen->defaultStipple, 0);
+    dixFreeScreenSpecificPrivates(pScreen);
+    pScreen->CloseScreen(pScreen);
+    dixFreePrivates(pScreen->devPrivates, PRIVATE_SCREEN);
+    free(pScreen);
+}
+
+void dixFreeAllScreens(void)
+{
+    for (int i = screenInfo.numGPUScreens - 1; i >= 0; i--) {
+        dixFreeScreen(screenInfo.gpuscreens[i]);
+        screenInfo.numGPUScreens = i;
+    }
+    memset(&screenInfo.numGPUScreens, 0, sizeof(screenInfo.numGPUScreens));
+
+    for (int i = screenInfo.numScreens - 1; i >= 0; i--) {
+        dixFreeScreen(screenInfo.screens[i]);
+        screenInfo.numScreens = i;
+    }
+    memset(&screenInfo.screens, 0, sizeof(screenInfo.numGPUScreens));
+}