xserver/hw/xwin/winmultiwindowshape.c

/*
 *Copyright (C) 1994-2000 The XFree86 Project, Inc. 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 THE XFREE86 PROJECT 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 the XFree86 Project
 *shall not be used in advertising or otherwise to promote the sale, use
 *or other dealings in this Software without prior written authorization
 *from the XFree86 Project.
 *
 * Authors:	Kensuke Matsuzaki
 *		Harold L Hunt II
 */

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

#include "win.h"

/*
 * winSetShapeMultiWindow - See Porting Layer Definition - p. 42
 */

void
winSetShapeMultiWindow(WindowPtr pWin, int kind)
{
    ScreenPtr pScreen = pWin->drawable.pScreen;

    winScreenPriv(pScreen);

#if ENABLE_DEBUG
    ErrorF("winSetShapeMultiWindow - pWin: %p kind: %i\n", pWin, kind);
#endif

    WIN_UNWRAP(SetShape);
    (*pScreen->SetShape) (pWin, kind);
    WIN_WRAP(SetShape, winSetShapeMultiWindow);

    /* Update the Windows window's shape */
    winReshapeMultiWindow(pWin);
    winUpdateRgnMultiWindow(pWin);

    return;
}

/*
 * winUpdateRgnMultiWindow - Local function to update a Windows window region
 */

void
winUpdateRgnMultiWindow(WindowPtr pWin)
{
    SetWindowRgn(winGetWindowPriv(pWin)->hWnd,
                 winGetWindowPriv(pWin)->hRgn, TRUE);

    /* The system now owns the region specified by the region handle and will delete it when it is no longer needed. */
    winGetWindowPriv(pWin)->hRgn = NULL;
}

/*
 * winReshapeMultiWindow - Computes the composite clipping region for a window
 */

void
winReshapeMultiWindow(WindowPtr pWin)
{
    int nRects;
    RegionRec rrNewShape;
    BoxPtr pShape, pRects, pEnd;
    HRGN hRgn, hRgnRect;

    winWindowPriv(pWin);

#if ENABLE_DEBUG
    winDebug("winReshape ()\n");
#endif

    /* Bail if the window is the root window */
    if (pWin->parent == NULL)
        return;

    /* Bail if the window is not top level */
    if (pWin->parent->parent != NULL)
        return;

    /* Bail if Windows window handle is invalid */
    if (pWinPriv->hWnd == NULL)
        return;

    /* Free any existing window region stored in the window privates */
    if (pWinPriv->hRgn != NULL) {
        DeleteObject(pWinPriv->hRgn);
        pWinPriv->hRgn = NULL;
    }

    /* Bail if the window has no bounding region defined */
    if (!wBoundingShape(pWin))
        return;

    RegionNull(&rrNewShape);
    RegionCopy(&rrNewShape, wBoundingShape(pWin));
    RegionTranslate(&rrNewShape, pWin->borderWidth, pWin->borderWidth);

    nRects = RegionNumRects(&rrNewShape);
    pShape = RegionRects(&rrNewShape);

    /* Don't do anything if there are no rectangles in the region */
    if (nRects > 0) {
        RECT rcClient;
        RECT rcWindow;
        int iOffsetX, iOffsetY;

        /* Get client rectangle */
        if (!GetClientRect(pWinPriv->hWnd, &rcClient)) {
            ErrorF("winReshape - GetClientRect failed, bailing: %d\n",
                   (int) GetLastError());
            return;
        }

        /* Translate client rectangle coords to screen coords */
        /* NOTE: Only transforms top and left members */
        ClientToScreen(pWinPriv->hWnd, (LPPOINT) &rcClient);

        /* Get window rectangle */
        if (!GetWindowRect(pWinPriv->hWnd, &rcWindow)) {
            ErrorF("winReshape - GetWindowRect failed, bailing: %d\n",
                   (int) GetLastError());
            return;
        }

        /* Calculate offset from window upper-left to client upper-left */
        iOffsetX = rcClient.left - rcWindow.left;
        iOffsetY = rcClient.top - rcWindow.top;

        /* Create initial Windows region for title bar */
        /* FIXME: Mean, nasty, ugly hack!!! */
        hRgn = CreateRectRgn(0, 0, rcWindow.right, iOffsetY);
        if (hRgn == NULL) {
            ErrorF("winReshape - Initial CreateRectRgn (%d, %d, %d, %d) "
                   "failed: %d\n",
                   0, 0, (int) rcWindow.right, iOffsetY, (int) GetLastError());
        }

        /* Loop through all rectangles in the X region */
        for (pRects = pShape, pEnd = pShape + nRects; pRects < pEnd; pRects++) {
            /* Create a Windows region for the X rectangle */
            hRgnRect = CreateRectRgn(pRects->x1 + iOffsetX,
                                     pRects->y1 + iOffsetY,
                                     pRects->x2 + iOffsetX,
                                     pRects->y2 + iOffsetY);
            if (hRgnRect == NULL) {
                ErrorF("winReshape - Loop CreateRectRgn (%d, %d, %d, %d) "
                       "failed: %d\n"
                       "\tx1: %d x2: %d xOff: %d y1: %d y2: %d yOff: %d\n",
                       pRects->x1 + iOffsetX,
                       pRects->y1 + iOffsetY,
                       pRects->x2 + iOffsetX,
                       pRects->y2 + iOffsetY,
                       (int) GetLastError(),
                       pRects->x1, pRects->x2, iOffsetX,
                       pRects->y1, pRects->y2, iOffsetY);
            }

            /* Merge the Windows region with the accumulated region */
            if (CombineRgn(hRgn, hRgn, hRgnRect, RGN_OR) == ERROR) {
                ErrorF("winReshape - CombineRgn () failed: %d\n",
                       (int) GetLastError());
            }

            /* Delete the temporary Windows region */
            DeleteObject(hRgnRect);
        }

        /* Save a handle to the composite region in the window privates */
        pWinPriv->hRgn = hRgn;
    }

    RegionUninit(&rrNewShape);

    return;
}