dix: Move AddScreen() over into dispatch.c and introduce init_screen()

 Partially pruned out of X.org commits:

 commit 987579c930bda803427a28cb82773c389f5110d6
 Author: Peter Hutterer <peter.hutterer@who-t.net>
 Date:   Wed Apr 22 13:26:40 2009 +1000

    dix: remove all but main() from main.c

    All other functions are pushed into where they seemed to fit.
    main.c is now linked separately into libmain.a and linked in by the various
    DDXs.

    Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

 commit 3478af3374abffa0c226ee077fda1fcfc0751e74
 Author: Dave Airlie <airlied@redhat.com>
 Date:   Tue Jun 5 17:01:21 2012 +0100

    screen: split out screen init code. (v2)

    This is a precursor for reusing this code to init gpu screens.

    v2: fixup int check as per Keith's review.

    Reviewed-by: Keith Packard <keithp@keithp.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

 Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

1 files changed, 212 insertions, 0 deletions

diff --git a/nx-X11/programs/Xserver/dix/dispatch.c b/nx-X11/programs/Xserver/dix/dispatch.c
index 438436526..3a414eca8 100644
--- a/nx-X11/programs/Xserver/dix/dispatch.c
+++ b/nx-X11/programs/Xserver/dix/dispatch.c
@@ -125,6 +125,8 @@ int ProcInitialConnection();
 extern xConnSetupPrefix connSetupPrefix;
 extern char *ConnectionInfo;
 
+extern int screenPrivateCount;
+
 Selection *CurrentSelections;
 int NumCurrentSelections;
 CallbackListPtr SelectionCallback = NULL;
@@ -3976,3 +3978,213 @@ MarkClientException(ClientPtr client)
 {
     client->noClientException = -1;
 }
+
+/*
+ * This array encodes the answer to the question "what is the log base 2
+ * of the number of pixels that fit in a scanline pad unit?"
+ * Note that ~0 is an invalid entry (mostly for the benefit of the reader).
+ */
+static int answer[6][4] = {
+    /* pad   pad   pad     pad*/
+    /*  8     16    32    64 */
+
+    {   3,     4,    5 ,   6 },	/* 1 bit per pixel */
+    {   1,     2,    3 ,   4 },	/* 4 bits per pixel */
+    {   0,     1,    2 ,   3 },	/* 8 bits per pixel */
+    {   ~0,    0,    1 ,   2 },	/* 16 bits per pixel */
+    {   ~0,    ~0,   0 ,   1 },	/* 24 bits per pixel */
+    {   ~0,    ~0,   0 ,   1 }	/* 32 bits per pixel */
+};
+
+/*
+ * This array gives the bytesperPixel value for cases where the number
+ * of bits per pixel is a multiple of 8 but not a power of 2.
+ */
+static int answerBytesPerPixel[ 33 ] = {
+    ~0, 0, ~0, ~0,	/* 1 bit per pixel */
+    0, ~0, ~0, ~0,	/* 4 bits per pixel */
+    0, ~0, ~0, ~0,	/* 8 bits per pixel */
+    ~0,~0, ~0, ~0,
+    0, ~0, ~0, ~0,	/* 16 bits per pixel */
+    ~0,~0, ~0, ~0,
+    3, ~0, ~0, ~0,	/* 24 bits per pixel */
+    ~0,~0, ~0, ~0,
+    0		/* 32 bits per pixel */
+};
+
+/*
+ * This array gives the answer to the question "what is the first index for
+ * the answer array above given the number of bits per pixel?"
+ * Note that ~0 is an invalid entry (mostly for the benefit of the reader).
+ */
+static int indexForBitsPerPixel[ 33 ] = {
+    ~0, 0, ~0, ~0,	/* 1 bit per pixel */
+    1, ~0, ~0, ~0,	/* 4 bits per pixel */
+    2, ~0, ~0, ~0,	/* 8 bits per pixel */
+    ~0,~0, ~0, ~0,
+    3, ~0, ~0, ~0,	/* 16 bits per pixel */
+    ~0,~0, ~0, ~0,
+    4, ~0, ~0, ~0,	/* 24 bits per pixel */
+    ~0,~0, ~0, ~0,
+    5		/* 32 bits per pixel */
+};
+
+/*
+ * This array gives the answer to the question "what is the second index for
+ * the answer array above given the number of bits per scanline pad unit?"
+ * Note that ~0 is an invalid entry (mostly for the benefit of the reader).
+ */
+static int indexForScanlinePad[ 65 ] = {
+    ~0, ~0, ~0, ~0,
+    ~0, ~0, ~0, ~0,
+     0, ~0, ~0, ~0,	/* 8 bits per scanline pad unit */
+    ~0, ~0, ~0, ~0,
+     1, ~0, ~0, ~0,	/* 16 bits per scanline pad unit */
+    ~0, ~0, ~0, ~0,
+    ~0, ~0, ~0, ~0,
+    ~0, ~0, ~0, ~0,
+     2, ~0, ~0, ~0,	/* 32 bits per scanline pad unit */
+    ~0, ~0, ~0, ~0,
+    ~0, ~0, ~0, ~0,
+    ~0, ~0, ~0, ~0,
+    ~0, ~0, ~0, ~0,
+    ~0, ~0, ~0, ~0,
+    ~0, ~0, ~0, ~0,
+    ~0, ~0, ~0, ~0,
+     3		/* 64 bits per scanline pad unit */
+};
+
+#ifndef MIN
+#define MIN(a,b) (((a) < (b)) ? (a) : (b))
+#endif
+
+static int init_screen(ScreenPtr pScreen, int i)
+{
+    int scanlinepad, format, depth, bitsPerPixel, j, k;
+#ifdef DEBUG
+    void	(**jNI) ();
+#endif /* DEBUG */
+
+    pScreen->myNum = i;
+    pScreen->WindowPrivateLen = 0;
+    pScreen->WindowPrivateSizes = (unsigned *)NULL;
+    pScreen->totalWindowSize =
+        ((sizeof(WindowRec) + sizeof(long) - 1) / sizeof(long)) * sizeof(long);
+    pScreen->GCPrivateLen = 0;
+    pScreen->GCPrivateSizes = (unsigned *)NULL;
+    pScreen->totalGCSize =
+        ((sizeof(GC) + sizeof(long) - 1) / sizeof(long)) * sizeof(long);
+#ifdef PIXPRIV
+    pScreen->PixmapPrivateLen = 0;
+    pScreen->PixmapPrivateSizes = (unsigned *)NULL;
+    pScreen->totalPixmapSize = BitmapBytePad(sizeof(PixmapRec)*8);
+#endif
+    pScreen->ClipNotify = 0;	/* for R4 ddx compatibility */
+    pScreen->CreateScreenResources = 0;
+
+#ifdef DEBUG
+    for (jNI = &pScreen->QueryBestSize;
+     jNI < (void (**) ()) &pScreen->SendGraphicsExpose;
+     jNI++)
+    *jNI = NotImplemented;
+#endif /* DEBUG */
+
+    /*
+     * This loop gets run once for every Screen that gets added,
+     * but thats ok.  If the ddx layer initializes the formats
+     * one at a time calling AddScreen() after each, then each
+     * iteration will make it a little more accurate.  Worst case
+     * we do this loop N * numPixmapFormats where N is # of screens.
+     * Anyway, this must be called after InitOutput and before the
+     * screen init routine is called.
+     */
+    for (format=0; format<screenInfo.numPixmapFormats; format++)
+    {
+    depth = screenInfo.formats[format].depth;
+    bitsPerPixel = screenInfo.formats[format].bitsPerPixel;
+    scanlinepad = screenInfo.formats[format].scanlinePad;
+    j = indexForBitsPerPixel[ bitsPerPixel ];
+    k = indexForScanlinePad[ scanlinepad ];
+    PixmapWidthPaddingInfo[ depth ].padPixelsLog2 = answer[j][k];
+    PixmapWidthPaddingInfo[ depth ].padRoundUp =
+        (scanlinepad/bitsPerPixel) - 1;
+    j = indexForBitsPerPixel[ 8 ]; /* bits per byte */
+    PixmapWidthPaddingInfo[ depth ].padBytesLog2 = answer[j][k];
+    PixmapWidthPaddingInfo[ depth ].bitsPerPixel = bitsPerPixel;
+    if (answerBytesPerPixel[bitsPerPixel])
+    {
+        PixmapWidthPaddingInfo[ depth ].notPower2 = 1;
+        PixmapWidthPaddingInfo[ depth ].bytesPerPixel =
+	answerBytesPerPixel[bitsPerPixel];
+    }
+    else
+    {
+        PixmapWidthPaddingInfo[ depth ].notPower2 = 0;
+    }
+    }
+    return 0;
+}
+
+void FreeScreen(ScreenPtr);
+
+int
+AddScreen(Bool (*pfnInit) (ScreenPtr /*pScreen */ ,
+                           int /*argc */ ,
+                           char **      /*argv */
+          ), int argc, char **argv)
+{
+
+    int i;
+    ScreenPtr pScreen;
+    Bool ret;
+
+    i = screenInfo.numScreens;
+    if (i == MAXSCREENS)
+        return -1;
+
+    pScreen = (ScreenPtr) calloc(1, sizeof(ScreenRec));
+    if (!pScreen)
+        return -1;
+
+    pScreen->devPrivates = (DevUnion *)calloc(sizeof(DevUnion),
+                               screenPrivateCount);
+    if (!pScreen->devPrivates && screenPrivateCount)
+        return -1;
+
+    ret = init_screen(pScreen, i);
+    if (ret != 0) {
+        free(pScreen);
+        return ret;
+    }
+    /* This is where screen specific stuff gets initialized.  Load the
+       screen structure, call the hardware, whatever.
+       This is also where the default colormap should be allocated and
+       also pixel values for blackPixel, whitePixel, and the cursor
+       Note that InitScreen is NOT allowed to modify argc, argv, or
+       any of the strings pointed to by argv.  They may be passed to
+       multiple screens.
+    */
+    pScreen->rgf = ~0L;  /* there are no scratch GCs yet*/
+    screenInfo.screens[i] = pScreen;
+    screenInfo.numScreens++;
+    if (!(*pfnInit)(pScreen, argc, argv))
+    {
+    FreeScreen(pScreen);
+    screenInfo.numScreens--;
+    return -1;
+    }
+    return i;
+}
+
+void
+FreeScreen(ScreenPtr pScreen)
+{
+    pScreen->root = NullWindow;
+    free(pScreen->WindowPrivateSizes);
+    free(pScreen->GCPrivateSizes);
+#ifdef PIXPRIV
+    free(pScreen->PixmapPrivateSizes);
+#endif
+    free(pScreen->devPrivates);
+    free(pScreen);
+}