dix: write out X_GetImage reply directly

No need for using a complex callback machinery, if we just move the
little pieces of byte-swapping directly into the request handler.

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

Xext/panoramiXprocs.c

@@ -1960,7 +1960,6 @@ PanoramiXGetImage(ClientPtr client)
     DrawablePtr drawables[MAXSCREENS];
     DrawablePtr pDraw;
     PanoramiXRes *draw;
-    xGetImageReply xgi;
     Bool isRoot;
     char *pBuf;
     int i, x, y, w, h, format, rc;
@@ -2034,12 +2033,7 @@ PanoramiXGetImage(ClientPtr client)
                                               IncludeInferiors);
     }
 
-    xgi = (xGetImageReply) {
-        .type = X_Reply,
-        .sequenceNumber = client->sequence,
-        .visual = wVisual(((WindowPtr) pDraw)),
-        .depth = pDraw->depth
-    };
+
     if (format == ZPixmap) {
         widthBytesLine = PixmapBytePad(w, pDraw->depth);
         length = widthBytesLine * h;
@@ -2053,7 +2047,13 @@ PanoramiXGetImage(ClientPtr client)
 
     }
 
-    xgi.length = bytes_to_int32(length);
+    xGetImageReply rep = {
+        .type = X_Reply,
+        .sequenceNumber = client->sequence,
+        .visual = wVisual(((WindowPtr) pDraw)),
+        .depth = pDraw->depth,
+        .length = bytes_to_int32(length),
+    };
 
     if (widthBytesLine == 0 || h == 0)
         linesPerBuf = 0;
@@ -2067,7 +2067,12 @@ PanoramiXGetImage(ClientPtr client)
     if (!(pBuf = xallocarray(linesPerBuf, widthBytesLine)))
         return BadAlloc;
 
-    WriteReplyToClient(client, sizeof(xGetImageReply), &xgi);
+    if (client->swapped) {
+        swaps(&rep.sequenceNumber);
+        swapl(&rep.length);
+        swapl(&rep.visual);
+    }
+    WriteToClient(client, sizeof(rep), &rep);
 
     if (linesPerBuf == 0) {
         /* nothing to do */

dix/dispatch.c

@@ -2147,7 +2147,6 @@ DoGetImage(ClientPtr client, int format, Drawable drawable,
     long widthBytesLine, length;
     Mask plane = 0;
     char *pBuf;
-    xGetImageReply xgi;
     RegionPtr pVisibleRegion = NULL;
 
     if ((format != XYPixmap) && (format != ZPixmap)) {
@@ -2158,7 +2157,10 @@ DoGetImage(ClientPtr client, int format, Drawable drawable,
     if (rc != Success)
         return rc;
 
-    memset(&xgi, 0, sizeof(xGetImageReply));
+    xGetImageReply rep = {
+        .type = X_Reply,
+        .sequenceNumber = client->sequence,
+    };
 
     relx = x;
     rely = y;
@@ -2193,11 +2195,11 @@ DoGetImage(ClientPtr client, int format, Drawable drawable,
             pBoundingDraw = (DrawablePtr) pDraw->pScreen->root;
         }
 
-        xgi.visual = wVisual(pWin);
+        rep.visual = wVisual(pWin);
     }
     else {
         pBoundingDraw = pDraw;
-        xgi.visual = None;
+        rep.visual = None;
     }
 
     /* "If the drawable is a pixmap, the given rectangle must be wholly
@@ -2215,9 +2217,7 @@ DoGetImage(ClientPtr client, int format, Drawable drawable,
         rely < 0 || rely + height > (int) pBoundingDraw->height)
         return BadMatch;
 
-    xgi.type = X_Reply;
-    xgi.sequenceNumber = client->sequence;
-    xgi.depth = pDraw->depth;
+    rep.depth = pDraw->depth;
     if (format == ZPixmap) {
         widthBytesLine = PixmapBytePad(width, pDraw->depth);
         length = widthBytesLine * height;
@@ -2232,9 +2232,8 @@ DoGetImage(ClientPtr client, int format, Drawable drawable,
 
     }
 
-    xgi.length = length;
+    rep.length = bytes_to_int32(length);
 
-    xgi.length = bytes_to_int32(xgi.length);
     if (widthBytesLine == 0 || height == 0)
         linesPerBuf = 0;
     else if (widthBytesLine >= IMAGE_BUFSIZE)
@@ -2259,7 +2258,13 @@ DoGetImage(ClientPtr client, int format, Drawable drawable,
     }
     if (!(pBuf = calloc(1, length)))
         return BadAlloc;
-    WriteReplyToClient(client, sizeof(xGetImageReply), &xgi);
+
+    if (client->swapped) {
+        swaps(&rep.sequenceNumber);
+        swapl(&rep.length);
+        swapl(&rep.visual);
+    }
+    WriteToClient(client, sizeof(rep), &rep);
 
     if (pDraw->type == DRAWABLE_WINDOW) {
         pVisibleRegion = &((WindowPtr) pDraw)->borderClip;

dix/swaprep.c

@@ -424,16 +424,6 @@ SGetFontPathReply(ClientPtr pClient, int size, xGetFontPathReply * pRep)
     WriteToClient(pClient, size, pRep);
 }
 
-void _X_COLD
-SGetImageReply(ClientPtr pClient, int size, xGetImageReply * pRep)
-{
-    swaps(&pRep->sequenceNumber);
-    swapl(&pRep->length);
-    swapl(&pRep->visual);
-    WriteToClient(pClient, size, pRep);
-    /* Fortunately, image doesn't need swapping */
-}
-
 void _X_COLD
 SListInstalledColormapsReply(ClientPtr pClient, int size,
                              xListInstalledColormapsReply * pRep)

dix/tables.c

@@ -788,7 +788,7 @@ ReplySwapPtr ReplySwapVector[256] = {
     ReplyNotSwappd,                             /* 70 */
     ReplyNotSwappd,
     ReplyNotSwappd,
-    (ReplySwapPtr) SGetImageReply,
+    ReplyNotSwappd,
     ReplyNotSwappd,
     ReplyNotSwappd,                             /* 75 */
     ReplyNotSwappd,

include/swaprep.h

@@ -115,10 +115,6 @@ extern void SGetFontPathReply(ClientPtr /* pClient */ ,
                               int /* size */ ,
                               xGetFontPathReply * /* pRep */ );
 
-extern void SGetImageReply(ClientPtr /* pClient */ ,
-                           int /* size */ ,
-                           xGetImageReply * /* pRep */ );
-
 extern void SListInstalledColormapsReply(ClientPtr /* pClient */ ,
                                          int /* size */ ,
                                          xListInstalledColormapsReply