[PATCH] render: fix ChangePicture when Xinerama is active (#49170)

[Adam Jackson]

ChangePicture takes wire XIDs, but didn't do any Xinerama translation,
which meant setting a clip pixmap or a separate alpha picture would
result in those elements pointing at the instance of the pixmap on
screen 0.  Which is, you know, bad.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=49170
Signed-off-by: Adam Jackson <ajax at redhat.com>
---
 render/picture.c | 42 ++++++++++++++++++++++++++++++++++++------
 1 file changed, 36 insertions(+), 6 deletions(-)

diff --git a/render/picture.c b/render/picture.c
index cd9bc74..31799b6 100644
--- a/render/picture.c
+++ b/render/picture.c
@@ -1007,6 +1007,38 @@ CreateConicalGradientPicture(Picture pid, xPointFixed * center, xFixed angle,
     return pPicture;
 }
 
+static int
+cpAlphaMap(void **result, XID id, ScreenPtr screen, ClientPtr client, Mask mode)
+{
+#ifdef PANORAMIX
+    if (!noPanoramiXExtension) {
+        PanoramiXRes *res;
+        int err = dixLookupResourceByType((void **)&res, id, XRT_PICTURE,
+                                          client, mode);
+        if (err != Success)
+            return err;
+        id = res->info[screen->myNum];
+    }
+#endif
+    return dixLookupResourceByType(result, id, PictureType, client, mode);
+}
+
+static int
+cpClipMask(void **result, XID id, ScreenPtr screen, ClientPtr client, Mask mode)
+{
+#ifdef PANORAMIX
+    if (!noPanoramiXExtension) {
+        PanoramiXRes *res;
+        int err = dixLookupResourceByType((void **)&res, id, XRT_PIXMAP,
+                                          client, mode);
+        if (err != Success)
+            return err;
+        id = res->info[screen->myNum];
+    }
+#endif
+    return dixLookupResourceByType(result, id, RT_PIXMAP, client, mode);
+}
+
 #define NEXT_VAL(_type) (vlist ? (_type) *vlist++ : (_type) ulist++->val)
 
 #define NEXT_PTR(_type) ((_type) ulist++->ptr)
@@ -1053,9 +1085,8 @@ ChangePicture(PicturePtr pPicture,
                 if (pid == None)
                     pAlpha = 0;
                 else {
-                    error = dixLookupResourceByType((void **) &pAlpha, pid,
-                                                    PictureType, client,
-                                                    DixReadAccess);
+                    error = cpAlphaMap((void **) &pAlpha, pid, pScreen,
+                                       client, DixReadAccess);
                     if (error != Success) {
                         client->errorValue = pid;
                         break;
@@ -1112,9 +1143,8 @@ ChangePicture(PicturePtr pPicture,
                 }
                 else {
                     clipType = CT_PIXMAP;
-                    error = dixLookupResourceByType((void **) &pPixmap, pid,
-                                                    RT_PIXMAP, client,
-                                                    DixReadAccess);
+                    error = cpClipMask((void **) &pPixmap, pid, pScreen,
+                                       client, DixReadAccess);
                     if (error != Success) {
                         client->errorValue = pid;
                         break;
-- 
1.9.3