xserver-multidpi/hw/xwin/winclipboardinit.c

/*
 *Copyright (C) 2003-2004 Harold L Hunt II All Rights Reserved.
 *
 *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, and to
 *permit persons to whom the Software is furnished to do so, subject to
 *the following conditions:
 *
 *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 HAROLD L HUNT II BE LIABLE FOR
 *ANY CLAIM, 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 Harold L Hunt II
 *shall not be used in advertising or otherwise to promote the sale, use
 *or other dealings in this Software without prior written authorization
 *from Harold L Hunt II.
 *
 * Authors:	Harold L Hunt II
 */

#ifdef HAVE_XWIN_CONFIG_H
#include <xwin-config.h>
#endif

#include <unistd.h>
#include <pthread.h>

#include "dixstruct.h"
#include "winclipboard.h"

#define WIN_CLIPBOARD_RETRIES			40
#define WIN_CLIPBOARD_DELAY			1

/*
 * Local typedefs
 */

typedef int (*winDispatchProcPtr) (ClientPtr);

int winProcSetSelectionOwner(ClientPtr /* client */ );

/*
 * References to external symbols
 */

extern winDispatchProcPtr winProcSetSelectionOwnerOrig;
extern Bool g_fClipboard;
extern HWND g_hwndClipboard;
extern Bool g_fClipboardLaunched;
extern Bool g_fClipboardStarted;

/*
 * Local variables
 */

static pthread_t g_ptClipboardProc;

/*
 *
 */
static void *
winClipboardThreadProc(void *arg)
{
  int clipboardRestarts = 0;

  while (1)
    {
      ++clipboardRestarts;

      /* Flag that clipboard client has been launched */
      g_fClipboardLaunched = TRUE;

      winClipboardProc(arg);

      /* checking if we need to restart */
      if (clipboardRestarts >= WIN_CLIPBOARD_RETRIES) {
        /* terminates clipboard thread but the main server still lives */
        ErrorF("winClipboardProc - the clipboard thread has restarted %d times and seems to be unstable, disabling clipboard integration\n", clipboardRestarts);
        g_fClipboard = FALSE;
        break;
      }

      sleep(WIN_CLIPBOARD_DELAY);
      ErrorF("winClipboardProc - trying to restart clipboard thread \n");
    }

  return NULL;
}

/*
 * Intialize the Clipboard module
 */

Bool
winInitClipboard(void)
{
    winDebug("winInitClipboard ()\n");

    /* Wrap some internal server functions */
    if (ProcVector[X_SetSelectionOwner] != winProcSetSelectionOwner) {
        winProcSetSelectionOwnerOrig = ProcVector[X_SetSelectionOwner];
        ProcVector[X_SetSelectionOwner] = winProcSetSelectionOwner;
    }

    /* Spawn a thread for the Clipboard module */
    if (pthread_create(&g_ptClipboardProc, NULL, winClipboardThreadProc, NULL)) {
        /* Bail if thread creation failed */
        ErrorF("winInitClipboard - pthread_create failed.\n");
        return FALSE;
    }

    return TRUE;
}

void
winClipboardShutdown(void)
{
  /* Close down clipboard resources */
  if (g_fClipboard && g_fClipboardLaunched && g_fClipboardStarted) {
    /* Synchronously destroy the clipboard window */
    if (g_hwndClipboard != NULL) {
      SendMessage(g_hwndClipboard, WM_DESTROY, 0, 0);
      /* NOTE: g_hwndClipboard is set to NULL in winclipboardthread.c */
    }
    else
      return;

    /* Wait for the clipboard thread to exit */
    pthread_join(g_ptClipboardProc, NULL);

    g_fClipboardLaunched = FALSE;
    g_fClipboardStarted = FALSE;

    winDebug("winClipboardShutdown - Clipboard thread has exited.\n");
  }
}

/*
 * Create the Windows window that we use to receive Windows messages
 */

HWND
winClipboardCreateMessagingWindow(void)
{
    WNDCLASSEX wc;
    HWND hwnd;

    /* Setup our window class */
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = winClipboardWindowProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = GetModuleHandle(NULL);
    wc.hIcon = 0;
    wc.hCursor = 0;
    wc.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = WIN_CLIPBOARD_WINDOW_CLASS;
    wc.hIconSm = 0;
    RegisterClassEx(&wc);

    /* Create the window */
    hwnd = CreateWindowExA(0,   /* Extended styles */
                           WIN_CLIPBOARD_WINDOW_CLASS,  /* Class name */
                           WIN_CLIPBOARD_WINDOW_TITLE,  /* Window name */
                           WS_OVERLAPPED,       /* Not visible anyway */
                           CW_USEDEFAULT,       /* Horizontal position */
                           CW_USEDEFAULT,       /* Vertical position */
                           CW_USEDEFAULT,       /* Right edge */
                           CW_USEDEFAULT,       /* Bottom edge */
                           (HWND) NULL, /* No parent or owner window */
                           (HMENU) NULL,        /* No menu */
                           GetModuleHandle(NULL),       /* Instance handle */
                           NULL);       /* Creation data */
    assert(hwnd != NULL);

    /* I'm not sure, but we may need to call this to start message processing */
    ShowWindow(hwnd, SW_HIDE);

    /* Similarly, we may need a call to this even though we don't paint */
    UpdateWindow(hwnd);

    return hwnd;
}

void
winFixClipboardChain(void)
{
    if (g_fClipboard && g_hwndClipboard) {
        PostMessage(g_hwndClipboard, WM_WM_REINIT, 0, 0);
    }
}