Xnest: screen: record visuals and cmaps in separate table

Record the associations between host's and our visuals as well their
corresponding cmaps in a global table, which's used later for lookups.

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

hw/xnest/Display.c

@@ -181,6 +181,9 @@ xnestCloseDisplay(void)
        If xnestDoFullGeneration all x resources will be destroyed upon closing
        the display connection.  There is no need to generate extra protocol.
      */
+    free(xnestVisualMap);
+    xnestVisualMap = NULL;
+    xnestNumVisualMap = 0;
 
     free(xnestDefaultColormaps);
     XFree(xnestVisuals);

hw/xnest/Screen.c

@@ -200,6 +200,11 @@ xnestOpenScreen(ScreenPtr pScreen, int argc, char *argv[])
     visuals = xallocarray(1, sizeof(VisualRec));
     numVisuals = 0;
 
+    if (!xnestVisualMap)
+        xnestVisualMap = calloc(1, sizeof(XnestVisualRec));
+    else
+        xnestVisualMap = reallocarray(xnestVisualMap, xnestNumVisualMap+1, sizeof(XnestVisualRec));
+
     depths = (DepthPtr) malloc(MAXDEPTH * sizeof(DepthRec));
     depths[0].depth = 1;
     depths[0].numVids = 0;
@@ -244,6 +249,20 @@ xnestOpenScreen(ScreenPtr pScreen, int argc, char *argv[])
                 .vid = FakeClientID(0),
             };
 
+            xnestVisualMap[xnestNumVisualMap] = (XnestVisualRec) {
+                .ourXID = visuals[numVisuals].vid,
+                .ourVisual = &visuals[numVisuals],
+                .upstreamDepth = depth_iter.data,
+                .upstreamVisual = &vts[x],
+                .upstreamCMap = xcb_generate_id(xnestUpstreamInfo.conn),
+            };
+
+            xcb_create_colormap(xnestUpstreamInfo.conn,
+                                XCB_COLORMAP_ALLOC_NONE,
+                                xnestVisualMap[xnestNumVisualMap].upstreamCMap,
+                                xnestUpstreamInfo.screenInfo->root,
+                                xnestVisualMap[xnestNumVisualMap].upstreamVisual->visual_id);
+
             numDepths = addDepthVisual(depths, numDepths, visuals[numVisuals].nplanes, visuals[numVisuals].vid);
 
             if (xnestUserDefaultClass || xnestUserDefaultDepth) {
@@ -266,11 +285,14 @@ xnestOpenScreen(ScreenPtr pScreen, int argc, char *argv[])
             }
 
             numVisuals++;
+            xnestNumVisualMap++;
             visuals = reallocarray(visuals, numVisuals+1, sizeof(VisualRec));
+            xnestVisualMap = reallocarray(xnestVisualMap, xnestNumVisualMap+1, sizeof(XnestVisualRec));
         }
     }
 breakout:
     visuals = reallocarray(visuals, numVisuals, sizeof(VisualRec));
+    xnestVisualMap = reallocarray(xnestVisualMap, xnestNumVisualMap, sizeof(XnestVisualRec));
 
     if (!found_default_visual) {
         ErrorF("Xnest: can't find matching visual for user specified depth %d\n", xnestDefaultDepth);

hw/xnest/xcb.c

@@ -23,6 +23,8 @@
 #include "Display.h"
 
 xnestUpstreamInfoRec xnestUpstreamInfo = { 0 };
+XnestVisualRec *xnestVisualMap;
+int xnestNumVisualMap;
 
 void xnest_upstream_setup(void) {
     xnestUpstreamInfo.screenId = DefaultScreen(xnestDisplay);

hw/xnest/xnest-xcb.h

@@ -63,6 +63,17 @@ typedef struct {
     int auto_repeat_mode;
 } XnKeyboardControl;
 
+typedef struct {
+    xcb_visualtype_t *upstreamVisual;
+    xcb_depth_t *upstreamDepth;
+    xcb_colormap_t upstreamCMap;
+    uint32_t ourXID;
+    VisualPtr ourVisual;
+} XnestVisualRec;
+
+extern XnestVisualRec *xnestVisualMap;
+extern int xnestNumVisualMap;
+
 void xnestEncodeKeyboardControl(XnKeyboardControl ctrl, long mask, uint32_t *value);
 
 typedef struct {