/*
 * X11 mouse driver
 *
 * Copyright 1998 Ulrich Weigand
 */

#include "config.h"

#include "ts_xlib.h"

#include "windef.h"
#include "wine/winuser16.h"

#include "debugtools.h"
#include "mouse.h"
#include "win.h"
#include "x11drv.h"

DEFAULT_DEBUG_CHANNEL(cursor);

/**********************************************************************/

static LONG X11DRV_MOUSE_WarpPointer = 0;  /* hack; see DISPLAY_MoveCursor */
static LPMOUSE_EVENT_PROC DefMouseEventProc = NULL;

/***********************************************************************
 *		X11DRV_GetCursor
 */
Cursor X11DRV_GetCursor( Display *display, CURSORICONINFO *ptr )
{
    Pixmap pixmapBits, pixmapMask, pixmapMaskInv, pixmapAll;
    XColor fg, bg;
    Cursor cursor = None;

    if (!ptr)  /* Create an empty cursor */
    {
        static const char data[] = { 0 };

        bg.red = bg.green = bg.blue = 0x0000;
        pixmapBits = XCreateBitmapFromData( display, root_window, data, 1, 1 );
        if (pixmapBits)
        {
            cursor = XCreatePixmapCursor( display, pixmapBits, pixmapBits,
                                          &bg, &bg, 0, 0 );
            XFreePixmap( display, pixmapBits );
        }
    }
    else  /* Create the X cursor from the bits */
    {
        XImage *image;
        GC gc;

        if (ptr->bPlanes * ptr->bBitsPerPixel != 1)
        {
            WARN("Cursor has more than 1 bpp!\n" );
            return 0;
        }

        /* Create a pixmap and transfer all the bits to it */

        /* NOTE: Following hack works, but only because XFree depth
         *       1 images really use 1 bit/pixel (and so the same layout
         *       as the Windows cursor data). Perhaps use a more generic
         *       algorithm here.
         */
        if (!(pixmapAll = XCreatePixmap( display, root_window,
                                         ptr->nWidth, ptr->nHeight * 2, 1 ))) return 0;
        if (!(image = XCreateImage( display, visual,
                                    1, ZPixmap, 0, (char *)(ptr + 1), ptr->nWidth,
                                    ptr->nHeight * 2, 16, ptr->nWidthBytes))) return 0;
        gc = XCreateGC( display, pixmapAll, 0, NULL );
        XSetGraphicsExposures( display, gc, False );
        image->byte_order = MSBFirst;
        image->bitmap_bit_order = MSBFirst;
        image->bitmap_unit = 16;
        _XInitImageFuncPtrs(image);
        XPutImage( display, pixmapAll, gc, image,
                   0, 0, 0, 0, ptr->nWidth, ptr->nHeight * 2 );
        image->data = NULL;
        XDestroyImage( image );

        /* Now create the 2 pixmaps for bits and mask */

        pixmapBits = XCreatePixmap( display, root_window, ptr->nWidth, ptr->nHeight, 1 );
        pixmapMask = XCreatePixmap( display, root_window, ptr->nWidth, ptr->nHeight, 1 );
        pixmapMaskInv = XCreatePixmap( display, root_window, ptr->nWidth, ptr->nHeight, 1 );

        /* Make sure everything went OK so far */

        if (pixmapBits && pixmapMask && pixmapMaskInv)
        {
            /* We have to do some magic here, as cursors are not fully
             * compatible between Windows and X11. Under X11, there
             * are only 3 possible color cursor: black, white and
             * masked. So we map the 4th Windows color (invert the
             * bits on the screen) to black and an additional white bit on 
             * an other place (+1,+1). This require some boolean arithmetic:
             *
             *         Windows          |          X11
             * And    Xor      Result   |   Bits     Mask     Result
             *  0      0     black      |    0        1     background
             *  0      1     white      |    1        1     foreground
             *  1      0     no change  |    X        0     no change
             *  1      1     inverted   |    0        1     background
             *
             * which gives:
             *  Bits = not 'And' and 'Xor' or 'And2' and 'Xor2'
             *  Mask = not 'And' or 'Xor' or 'And2' and 'Xor2'
             *
             * FIXME: apparently some servers do support 'inverted' color.
             * I don't know if it's correct per the X spec, but maybe
             * we ought to take advantage of it.  -- AJ
             */
            XSetFunction( display, gc, GXcopy );
            XCopyArea( display, pixmapAll, pixmapBits, gc,
                       0, 0, ptr->nWidth, ptr->nHeight, 0, 0 );
            XCopyArea( display, pixmapAll, pixmapMask, gc,
                       0, 0, ptr->nWidth, ptr->nHeight, 0, 0 );
            XCopyArea( display, pixmapAll, pixmapMaskInv, gc,
                       0, 0, ptr->nWidth, ptr->nHeight, 0, 0 );
            XSetFunction( display, gc, GXand );
            XCopyArea( display, pixmapAll, pixmapMaskInv, gc,
                       0, ptr->nHeight, ptr->nWidth, ptr->nHeight, 0, 0 );
            XSetFunction( display, gc, GXandReverse );
            XCopyArea( display, pixmapAll, pixmapBits, gc,
                       0, ptr->nHeight, ptr->nWidth, ptr->nHeight, 0, 0 );
            XSetFunction( display, gc, GXorReverse );
            XCopyArea( display, pixmapAll, pixmapMask, gc,
                       0, ptr->nHeight, ptr->nWidth, ptr->nHeight, 0, 0 );
            /* Additional white */
            XSetFunction( display, gc, GXor );
            XCopyArea( display, pixmapMaskInv, pixmapMask, gc,
                       0, 0, ptr->nWidth, ptr->nHeight, 1, 1 );
            XCopyArea( display, pixmapMaskInv, pixmapBits, gc,
                       0, 0, ptr->nWidth, ptr->nHeight, 1, 1 );
            XSetFunction( display, gc, GXcopy );
            fg.red = fg.green = fg.blue = 0xffff;
            bg.red = bg.green = bg.blue = 0x0000;
            cursor = XCreatePixmapCursor( display, pixmapBits, pixmapMask,
                                &fg, &bg, ptr->ptHotSpot.x, ptr->ptHotSpot.y );
        }

        /* Now free everything */

        if (pixmapAll) XFreePixmap( display, pixmapAll );
        if (pixmapBits) XFreePixmap( display, pixmapBits );
        if (pixmapMask) XFreePixmap( display, pixmapMask );
        if (pixmapMaskInv) XFreePixmap( display, pixmapMaskInv );
        XFreeGC( display, gc );
    }
    return cursor;
}

/* set the cursor of a window; helper for X11DRV_SetCursor */
static BOOL CALLBACK set_win_cursor( HWND hwnd, LPARAM cursor )
{
    Window win = X11DRV_get_whole_window( hwnd );
    if (win) TSXDefineCursor( thread_display(), win, (Cursor)cursor );
    return TRUE;
}

/***********************************************************************
 *		SetCursor (X11DRV.@)
 */
void X11DRV_SetCursor( CURSORICONINFO *lpCursor )
{
    Cursor cursor;

    if (root_window != DefaultRootWindow(gdi_display))
    {
        /* If in desktop mode, set the cursor on the desktop window */

        wine_tsx11_lock();
        cursor = X11DRV_GetCursor( gdi_display, lpCursor );
        if (cursor)
        {
            XDefineCursor( gdi_display, root_window, cursor );
            XFreeCursor( gdi_display, cursor );
        }
        wine_tsx11_unlock();
    }
    else /* set the same cursor for all top-level windows of the current thread */
    {
        Display *display = thread_display();

        wine_tsx11_lock();
        cursor = X11DRV_GetCursor( display, lpCursor );
        wine_tsx11_unlock();
        if (cursor)
        {
/*            EnumThreadWindows( GetCurrentThreadId(), set_win_cursor, (LPARAM)cursor );*/
            EnumWindows( set_win_cursor, (LPARAM)cursor );
            TSXFreeCursor( display, cursor );
        }
    }
}

/***********************************************************************
 *		SetCursorPos (X11DRV.@)
 */
void X11DRV_SetCursorPos(INT wAbsX, INT wAbsY)
{
  /* 
   * We do not want to create MotionNotify events here, 
   * otherwise we will get an endless recursion:
   * XMotionEvent -> MOUSEEVENTF_MOVE -> mouse_event -> DisplayMoveCursor
   * -> XWarpPointer -> XMotionEvent -> ...
   *
   * Unfortunately, the XWarpPointer call does create a MotionNotify
   * event. So, we use a hack: before MOUSE_SendEvent calls the mouse event
   * procedure, it sets a global flag. If this flag is set, we skip the
   * XWarpPointer call.  If we are *not* called from within MOUSE_SendEvent,
   * we will call XWarpPointer, which will create a MotionNotify event.
   * Strictly speaking, this is also wrong, but that should normally not
   * have any negative effects ...
   *
   * But first of all, we check whether we already are at the position
   * are supposed to move to; if so, we don't need to do anything.
   */

  Display *display = thread_display();
  Window root, child;
  int rootX, rootY, winX, winY;
  unsigned int xstate;
  
  if (X11DRV_MOUSE_WarpPointer < 0) return;

  if (!TSXQueryPointer( display, root_window, &root, &child,
			&rootX, &rootY, &winX, &winY, &xstate ))
    return;
  
  if ( winX == wAbsX && winY == wAbsY )
    return;
  
  TRACE("(%d,%d): moving from (%d,%d)\n", wAbsX, wAbsY, winX, winY );

  wine_tsx11_lock();
  XWarpPointer( display, root_window, root_window, 0, 0, 0, 0, wAbsX, wAbsY );
  XFlush( display ); /* just in case */
  wine_tsx11_unlock();
}

/***********************************************************************
 *		GetCursorPos (X11DRV.@)
 */
void X11DRV_GetCursorPos(LPPOINT pos)
{
  Display *display = thread_display();
  Window root, child;
  int rootX, rootY, winX, winY;
  unsigned int xstate;

  if (!TSXQueryPointer( display, root_window, &root, &child,
                        &rootX, &rootY, &winX, &winY, &xstate ))
    return;

  TRACE("pointer at (%d,%d)\n", winX, winY );
  pos->x = winX;
  pos->y = winY;
}

/***********************************************************************
 *		InitMouse (X11DRV.@)
 */
void X11DRV_InitMouse( LPMOUSE_EVENT_PROC proc )
{
    static int init_done;

    DefMouseEventProc = proc;

    if (!init_done)
    {
        Window root, child;
        int root_x, root_y, child_x, child_y;
        unsigned int KeyState;
  
        init_done = 1;
        /* Get the current mouse position and simulate an absolute mouse
           movement to initialize the mouse global variables */
        TSXQueryPointer( thread_display(), root_window, &root, &child,
                         &root_x, &root_y, &child_x, &child_y, &KeyState);
        X11DRV_SendEvent(MOUSEEVENTF_MOVE | MOUSEEVENTF_ABSOLUTE,
                         root_x, root_y, X11DRV_EVENT_XStateToKeyState(KeyState),
                         0, GetTickCount(), 0 );
    }
}


/***********************************************************************
 *		X11DRV_SendEvent (internal)
 */
void X11DRV_SendEvent( DWORD mouseStatus, DWORD posX, DWORD posY,
                       WORD keyState, DWORD data, DWORD time, HWND hWnd )
{
    int width  = GetSystemMetrics( SM_CXSCREEN );
    int height = GetSystemMetrics( SM_CYSCREEN );
    int iWndsLocks;
    WINE_MOUSEEVENT wme;

    if ( !DefMouseEventProc ) return;

    TRACE("(%04lX,%ld,%ld)\n", mouseStatus, posX, posY );

    if (mouseStatus & MOUSEEVENTF_MOVE) {
      if (mouseStatus & MOUSEEVENTF_ABSOLUTE) {
	/* Relative mouse movements seems not to be scaled as absolute ones */
	posX = (((long)posX << 16) + width-1)  / width;
	posY = (((long)posY << 16) + height-1) / height;
      }
    }

    wme.magic    = WINE_MOUSEEVENT_MAGIC;
    wme.time     = time;
    wme.hWnd     = hWnd;
    wme.keyState = keyState;
    
    InterlockedDecrement( &X11DRV_MOUSE_WarpPointer );
    /* To avoid deadlocks, we have to suspend all locks on windows structures
       before the program control is passed to the mouse driver */
    iWndsLocks = WIN_SuspendWndsLock();
    DefMouseEventProc( mouseStatus, posX, posY, data, (DWORD)&wme );
    WIN_RestoreWndsLock(iWndsLocks);
    InterlockedIncrement( &X11DRV_MOUSE_WarpPointer );
}