Move pseudoramiX code where it can be shared between Xwin and Xquartz

Move pseudoramiX code to a separate top-level directory.  Link Xwin and Xquartz
with libPseudoramiX

I'm not sure moving this to a top-level directory is appropriate, but I'm not
sure where else it fits.

Future work: pseudoramiX can probably be consolidated with the rrxinerama code
(which I think provides fake xinerama data when real XINERAMA is disabled and we
only have one screen)

v2: fix distcheck

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
Reviewed-by: Colin Harrison <colin.harrison@virgin.net>
Reviewed-by: Marc Haesen <marha@users.sourceforge.net>

3 files changed, 533 insertions, 0 deletions

diff --git a/pseudoramiX/Makefile.am b/pseudoramiX/Makefile.am
new file mode 100644
index 000000000..17b664b9e
--- /dev/null
+++ b/pseudoramiX/Makefile.am
@@ -0,0 +1,7 @@
+# Fake Xinerama extension
+
+AM_CFLAGS = $(DIX_CFLAGS)
+
+noinst_LTLIBRARIES = libPseudoramiX.la
+
+libPseudoramiX_la_SOURCES = pseudoramiX.c pseudoramiX.h
diff --git a/pseudoramiX/pseudoramiX.c b/pseudoramiX/pseudoramiX.c
new file mode 100644
index 000000000..23dbc7328
--- /dev/null
+++ b/pseudoramiX/pseudoramiX.c
@@ -0,0 +1,516 @@
+/*
+ * Minimal implementation of PanoramiX/Xinerama
+ *
+ * This is used in rootless mode where the underlying window server
+ * already provides an abstracted view of multiple screens as one
+ * large screen area.
+ *
+ * This code is largely based on panoramiX.c, which contains the
+ * following copyright notice:
+ */
+/*****************************************************************
+   Copyright (c) 1991, 1997 Digital Equipment Corporation, Maynard, Massachusetts.
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to deal
+   in the Software without restriction, including without limitation the rights
+   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+   copies of the Software.
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+   DIGITAL EQUIPMENT CORPORATION BE LIABLE FOR ANY CLAIM, DAMAGES, INCLUDING,
+   BUT NOT LIMITED TO CONSEQUENTIAL OR INCIDENTAL DAMAGES, OR OTHER LIABILITY,
+   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+   IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+   Except as contained in this notice, the name of Digital Equipment Corporation
+   shall not be used in advertising or otherwise to promote the sale, use or other
+   dealings in this Software without prior written authorization from Digital
+   Equipment Corporation.
+ ******************************************************************/
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include "pseudoramiX.h"
+#include "extnsionst.h"
+#include "extinit.h"
+#include "dixstruct.h"
+#include "window.h"
+#include <X11/extensions/panoramiXproto.h>
+#include "globals.h"
+
+#define TRACE PseudoramiXTrace("TRACE " __FILE__ ":%s",__FUNCTION__)
+#define DEBUG_LOG PseudoramiXDebug
+
+Bool noPseudoramiXExtension = FALSE;
+
+extern int
+ProcPanoramiXQueryVersion(ClientPtr client);
+
+static void
+PseudoramiXResetProc(ExtensionEntry *extEntry);
+
+static int
+ProcPseudoramiXQueryVersion(ClientPtr client);
+static int
+ProcPseudoramiXGetState(ClientPtr client);
+static int
+ProcPseudoramiXGetScreenCount(ClientPtr client);
+static int
+ProcPseudoramiXGetScreenSize(ClientPtr client);
+static int
+ProcPseudoramiXIsActive(ClientPtr client);
+static int
+ProcPseudoramiXQueryScreens(ClientPtr client);
+static int
+ProcPseudoramiXDispatch(ClientPtr client);
+
+static int
+SProcPseudoramiXQueryVersion(ClientPtr client);
+static int
+SProcPseudoramiXGetState(ClientPtr client);
+static int
+SProcPseudoramiXGetScreenCount(ClientPtr client);
+static int
+SProcPseudoramiXGetScreenSize(ClientPtr client);
+static int
+SProcPseudoramiXIsActive(ClientPtr client);
+static int
+SProcPseudoramiXQueryScreens(ClientPtr client);
+static int
+SProcPseudoramiXDispatch(ClientPtr client);
+
+typedef struct {
+    int x;
+    int y;
+    int w;
+    int h;
+} PseudoramiXScreenRec;
+
+static PseudoramiXScreenRec *pseudoramiXScreens = NULL;
+static int pseudoramiXScreensAllocated = 0;
+static int pseudoramiXNumScreens = 0;
+static unsigned long pseudoramiXGeneration = 0;
+
+static void
+PseudoramiXTrace(const char *format, ...)
+{
+    va_list ap;
+
+    va_start(ap, format);
+    LogVMessageVerb(X_NONE, 10, format, ap);
+    va_end(ap);
+}
+
+static void
+PseudoramiXDebug(const char *format, ...)
+{
+    va_list ap;
+
+    va_start(ap, format);
+    LogVMessageVerb(X_NONE, 3, format, ap);
+    va_end(ap);
+}
+
+// Add a PseudoramiX screen.
+// The rest of the X server will know nothing about this screen.
+// Can be called before or after extension init.
+// Screens must be re-added once per generation.
+void
+PseudoramiXAddScreen(int x, int y, int w, int h)
+{
+    PseudoramiXScreenRec *s;
+
+    if (noPseudoramiXExtension) return;
+
+    if (pseudoramiXNumScreens == pseudoramiXScreensAllocated) {
+        pseudoramiXScreensAllocated += pseudoramiXScreensAllocated + 1;
+        pseudoramiXScreens = realloc(pseudoramiXScreens,
+                                     pseudoramiXScreensAllocated *
+                                     sizeof(PseudoramiXScreenRec));
+    }
+
+    DEBUG_LOG("x: %d, y: %d, w: %d, h: %d\n", x, y, w, h);
+
+    s = &pseudoramiXScreens[pseudoramiXNumScreens++];
+    s->x = x;
+    s->y = y;
+    s->w = w;
+    s->h = h;
+}
+
+// Initialize PseudoramiX.
+// Copied from PanoramiXExtensionInit
+void
+PseudoramiXExtensionInit(void)
+{
+    Bool success = FALSE;
+    ExtensionEntry      *extEntry;
+
+    if (noPseudoramiXExtension) return;
+
+    TRACE;
+
+    /* Even with only one screen we need to enable PseudoramiX to allow
+       dynamic screen configuration changes. */
+#if 0
+    if (pseudoramiXNumScreens == 1) {
+        // Only one screen - disable Xinerama extension.
+        noPseudoramiXExtension = TRUE;
+        return;
+    }
+#endif
+
+    if (pseudoramiXGeneration != serverGeneration) {
+        extEntry = AddExtension(PANORAMIX_PROTOCOL_NAME, 0, 0,
+                                ProcPseudoramiXDispatch,
+                                SProcPseudoramiXDispatch,
+                                PseudoramiXResetProc,
+                                StandardMinorOpcode);
+        if (!extEntry) {
+            ErrorF("PseudoramiXExtensionInit(): AddExtension failed\n");
+        }
+        else {
+            pseudoramiXGeneration = serverGeneration;
+            success = TRUE;
+        }
+    }
+
+    if (!success) {
+        ErrorF("%s Extension (PseudoramiX) failed to initialize\n",
+               PANORAMIX_PROTOCOL_NAME);
+        return;
+    }
+}
+
+void
+PseudoramiXResetScreens(void)
+{
+    TRACE;
+
+    pseudoramiXNumScreens = 0;
+}
+
+static void
+PseudoramiXResetProc(ExtensionEntry *extEntry)
+{
+    TRACE;
+
+    PseudoramiXResetScreens();
+}
+
+// was PanoramiX
+static int
+ProcPseudoramiXQueryVersion(ClientPtr client)
+{
+    TRACE;
+
+    return ProcPanoramiXQueryVersion(client);
+}
+
+// was PanoramiX
+static int
+ProcPseudoramiXGetState(ClientPtr client)
+{
+    REQUEST(xPanoramiXGetStateReq);
+    WindowPtr pWin;
+    xPanoramiXGetStateReply rep;
+    register int rc;
+
+    TRACE;
+
+    REQUEST_SIZE_MATCH(xPanoramiXGetStateReq);
+    rc = dixLookupWindow(&pWin, stuff->window, client, DixGetAttrAccess);
+    if (rc != Success)
+        return rc;
+
+    rep.type = X_Reply;
+    rep.length = 0;
+    rep.sequenceNumber = client->sequence;
+    rep.state = !noPseudoramiXExtension;
+    rep.window = stuff->window;
+    if (client->swapped) {
+        swaps(&rep.sequenceNumber);
+        swapl(&rep.length);
+        swapl(&rep.window);
+    }
+    WriteToClient(client, sizeof(xPanoramiXGetStateReply),&rep);
+    return Success;
+}
+
+// was PanoramiX
+static int
+ProcPseudoramiXGetScreenCount(ClientPtr client)
+{
+    REQUEST(xPanoramiXGetScreenCountReq);
+    WindowPtr pWin;
+    xPanoramiXGetScreenCountReply rep;
+    register int rc;
+
+    TRACE;
+
+    REQUEST_SIZE_MATCH(xPanoramiXGetScreenCountReq);
+    rc = dixLookupWindow(&pWin, stuff->window, client, DixGetAttrAccess);
+    if (rc != Success)
+        return rc;
+
+    rep.type = X_Reply;
+    rep.length = 0;
+    rep.sequenceNumber = client->sequence;
+    rep.ScreenCount = pseudoramiXNumScreens;
+    rep.window = stuff->window;
+    if (client->swapped) {
+        swaps(&rep.sequenceNumber);
+        swapl(&rep.length);
+        swapl(&rep.window);
+    }
+    WriteToClient(client, sizeof(xPanoramiXGetScreenCountReply),&rep);
+    return Success;
+}
+
+// was PanoramiX
+static int
+ProcPseudoramiXGetScreenSize(ClientPtr client)
+{
+    REQUEST(xPanoramiXGetScreenSizeReq);
+    WindowPtr pWin;
+    xPanoramiXGetScreenSizeReply rep;
+    register int rc;
+
+    TRACE;
+
+    if (stuff->screen >= pseudoramiXNumScreens)
+      return BadMatch;
+
+    REQUEST_SIZE_MATCH(xPanoramiXGetScreenSizeReq);
+    rc = dixLookupWindow(&pWin, stuff->window, client, DixGetAttrAccess);
+    if (rc != Success)
+        return rc;
+
+    rep.type = X_Reply;
+    rep.length = 0;
+    rep.sequenceNumber = client->sequence;
+    /* screen dimensions */
+    rep.width = pseudoramiXScreens[stuff->screen].w;
+    // was screenInfo.screens[stuff->screen]->width;
+    rep.height = pseudoramiXScreens[stuff->screen].h;
+    // was screenInfo.screens[stuff->screen]->height;
+    rep.window = stuff->window;
+    rep.screen = stuff->screen;
+    if (client->swapped) {
+        swaps(&rep.sequenceNumber);
+        swapl(&rep.length);
+        swapl(&rep.width);
+        swapl(&rep.height);
+        swapl(&rep.window);
+        swapl(&rep.screen);
+    }
+    WriteToClient(client, sizeof(xPanoramiXGetScreenSizeReply),&rep);
+    return Success;
+}
+
+// was Xinerama
+static int
+ProcPseudoramiXIsActive(ClientPtr client)
+{
+    /* REQUEST(xXineramaIsActiveReq); */
+    xXineramaIsActiveReply rep;
+
+    TRACE;
+
+    REQUEST_SIZE_MATCH(xXineramaIsActiveReq);
+
+    rep.type = X_Reply;
+    rep.length = 0;
+    rep.sequenceNumber = client->sequence;
+    rep.state = !noPseudoramiXExtension;
+    if (client->swapped) {
+        swaps(&rep.sequenceNumber);
+        swapl(&rep.length);
+        swapl(&rep.state);
+    }
+    WriteToClient(client, sizeof(xXineramaIsActiveReply),&rep);
+    return Success;
+}
+
+// was Xinerama
+static int
+ProcPseudoramiXQueryScreens(ClientPtr client)
+{
+    /* REQUEST(xXineramaQueryScreensReq); */
+    xXineramaQueryScreensReply rep;
+
+    DEBUG_LOG("noPseudoramiXExtension=%d, pseudoramiXNumScreens=%d\n",
+              noPseudoramiXExtension,
+              pseudoramiXNumScreens);
+
+    REQUEST_SIZE_MATCH(xXineramaQueryScreensReq);
+
+    rep.type = X_Reply;
+    rep.sequenceNumber = client->sequence;
+    rep.number = noPseudoramiXExtension ? 0 : pseudoramiXNumScreens;
+    rep.length = bytes_to_int32(rep.number * sz_XineramaScreenInfo);
+    if (client->swapped) {
+        swaps(&rep.sequenceNumber);
+        swapl(&rep.length);
+        swapl(&rep.number);
+    }
+    WriteToClient(client, sizeof(xXineramaQueryScreensReply),&rep);
+
+    if (!noPseudoramiXExtension) {
+        xXineramaScreenInfo scratch;
+        int i;
+
+        for (i = 0; i < pseudoramiXNumScreens; i++) {
+            scratch.x_org = pseudoramiXScreens[i].x;
+            scratch.y_org = pseudoramiXScreens[i].y;
+            scratch.width = pseudoramiXScreens[i].w;
+            scratch.height = pseudoramiXScreens[i].h;
+
+            if (client->swapped) {
+                swaps(&scratch.x_org);
+                swaps(&scratch.y_org);
+                swaps(&scratch.width);
+                swaps(&scratch.height);
+            }
+            WriteToClient(client, sz_XineramaScreenInfo,&scratch);
+        }
+    }
+
+    return Success;
+}
+
+// was PanoramiX
+static int
+ProcPseudoramiXDispatch(ClientPtr client)
+{
+    REQUEST(xReq);
+    TRACE;
+    switch (stuff->data) {
+    case X_PanoramiXQueryVersion:
+        return ProcPseudoramiXQueryVersion(client);
+
+    case X_PanoramiXGetState:
+        return ProcPseudoramiXGetState(client);
+
+    case X_PanoramiXGetScreenCount:
+        return ProcPseudoramiXGetScreenCount(client);
+
+    case X_PanoramiXGetScreenSize:
+        return ProcPseudoramiXGetScreenSize(client);
+
+    case X_XineramaIsActive:
+        return ProcPseudoramiXIsActive(client);
+
+    case X_XineramaQueryScreens:
+        return ProcPseudoramiXQueryScreens(client);
+    }
+    return BadRequest;
+}
+
+static int
+SProcPseudoramiXQueryVersion(ClientPtr client)
+{
+    REQUEST(xPanoramiXQueryVersionReq);
+
+    TRACE;
+
+    swaps(&stuff->length);
+    REQUEST_SIZE_MATCH(xPanoramiXQueryVersionReq);
+    return ProcPseudoramiXQueryVersion(client);
+}
+
+static int
+SProcPseudoramiXGetState(ClientPtr client)
+{
+    REQUEST(xPanoramiXGetStateReq);
+
+    TRACE;
+
+    swaps(&stuff->length);
+    REQUEST_SIZE_MATCH(xPanoramiXGetStateReq);
+    return ProcPseudoramiXGetState(client);
+}
+
+static int
+SProcPseudoramiXGetScreenCount(ClientPtr client)
+{
+    REQUEST(xPanoramiXGetScreenCountReq);
+
+    TRACE;
+
+    swaps(&stuff->length);
+    REQUEST_SIZE_MATCH(xPanoramiXGetScreenCountReq);
+    return ProcPseudoramiXGetScreenCount(client);
+}
+
+static int
+SProcPseudoramiXGetScreenSize(ClientPtr client)
+{
+    REQUEST(xPanoramiXGetScreenSizeReq);
+
+    TRACE;
+
+    swaps(&stuff->length);
+    REQUEST_SIZE_MATCH(xPanoramiXGetScreenSizeReq);
+    return ProcPseudoramiXGetScreenSize(client);
+}
+
+static int
+SProcPseudoramiXIsActive(ClientPtr client)
+{
+    REQUEST(xXineramaIsActiveReq);
+
+    TRACE;
+
+    swaps(&stuff->length);
+    REQUEST_SIZE_MATCH(xXineramaIsActiveReq);
+    return ProcPseudoramiXIsActive(client);
+}
+
+static int
+SProcPseudoramiXQueryScreens(ClientPtr client)
+{
+    REQUEST(xXineramaQueryScreensReq);
+
+    TRACE;
+
+    swaps(&stuff->length);
+    REQUEST_SIZE_MATCH(xXineramaQueryScreensReq);
+    return ProcPseudoramiXQueryScreens(client);
+}
+
+static int
+SProcPseudoramiXDispatch(ClientPtr client)
+{
+    REQUEST(xReq);
+
+    TRACE;
+
+    switch (stuff->data) {
+    case X_PanoramiXQueryVersion:
+        return SProcPseudoramiXQueryVersion(client);
+
+    case X_PanoramiXGetState:
+        return SProcPseudoramiXGetState(client);
+
+    case X_PanoramiXGetScreenCount:
+        return SProcPseudoramiXGetScreenCount(client);
+
+    case X_PanoramiXGetScreenSize:
+        return SProcPseudoramiXGetScreenSize(client);
+
+    case X_XineramaIsActive:
+        return SProcPseudoramiXIsActive(client);
+
+    case X_XineramaQueryScreens:
+        return SProcPseudoramiXQueryScreens(client);
+    }
+    return BadRequest;
+}
diff --git a/pseudoramiX/pseudoramiX.h b/pseudoramiX/pseudoramiX.h
new file mode 100644
index 000000000..f063919dd
--- /dev/null
+++ b/pseudoramiX/pseudoramiX.h
@@ -0,0 +1,10 @@
+/*
+ * Minimal implementation of PanoramiX/Xinerama
+ */
+
+extern int noPseudoramiXExtension;
+
+void
+PseudoramiXAddScreen(int x, int y, int w, int h);
+void
+PseudoramiXResetScreens(void);