/*** $Id: clip.c,v 1.13 2003/09/04 06:02:53 weiym Exp $**** clip.c: Clipping operations of GDI.**** Copyright (C) 2003 Feynman Software** Copyright (C) 2000 ~ 2002 Wei Yongming.**** Current maintainer: Wei Yongming.**** Create date: 2000/06/12, derived from original gdi.c*//*** This program is free software; you can redistribute it and/or modify** it under the terms of the GNU General Public License as published by** the Free Software Foundation; either version 2 of the License, or** (at your option) any later version.**** This program is distributed in the hope that it will be useful,** but WITHOUT ANY WARRANTY; without even the implied warranty of** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the** GNU General Public License for more details.**** You should have received a copy of the GNU General Public License** along with this program; if not, write to the Free Software** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA*//*** TODO:*/#include "common.h"#include "minigui.h"#include "gdi.h"#include "window.h"#include "cliprect.h"#include "gal.h"#include "internals.h"#include "ctrlclass.h"#include "dc.h"/************************* Clipping support **********************************/#define RESET_LCRGN(pdc)\    if (pdc->lcrgn.head == NULL) {\        RECT my_rc = {0, 0, 65535, 65535};\        SetClipRgn (&pdc->lcrgn, &my_rc);\    }void GUIAPI ExcludeClipRect (HDC hdc, const RECT* prc){    PDC pdc;    RECT rc;    pdc = dc_HDC2PDC (hdc);    rc = *prc;    NormalizeRect (&rc);    if (IsRectEmpty (&rc))        return;    if (dc_IsGeneralDC (pdc)) {        RESET_LCRGN(pdc);        SubtractClipRect (&pdc->lcrgn, &rc);        // Transfer logical to device to screen here.        coor_DP2SP (pdc, &rc.left, &rc.top);        coor_DP2SP (pdc, &rc.right, &rc.bottom);    }    SubtractClipRect (&pdc->ecrgn, &rc);}void GUIAPI IncludeClipRect (HDC hdc, const RECT* prc){    PDC pdc;    RECT rc;    pdc = dc_HDC2PDC(hdc);    rc = *prc;    NormalizeRect(&rc);    if (IsRectEmpty (&rc))        return;    if (dc_IsGeneralDC (pdc)) {        if (pdc->lcrgn.head)            AddClipRect (&pdc->lcrgn, &rc);        else            SetClipRgn (&pdc->lcrgn, &rc);            // Transfer logical to device to screen here.        coor_DP2SP (pdc, &rc.left, &rc.top);        coor_DP2SP (pdc, &rc.right, &rc.bottom);        LOCK (&pdc->pGCRInfo->lock);        dc_GenerateECRgn (pdc, TRUE);        UNLOCK (&pdc->pGCRInfo->lock);    }    else {        AddClipRect (&pdc->ecrgn, &rc);    }}void GUIAPI ClipRectIntersect (HDC hdc, const RECT* prc){    PDC pdc;    RECT rc;    pdc = dc_HDC2PDC(hdc);    rc = *prc;    NormalizeRect(&rc);    if (IsRectEmpty (&rc))        return;    if (dc_IsGeneralDC (pdc)) {        RESET_LCRGN(pdc);        IntersectClipRect (&pdc->lcrgn, &rc);        // Transfer logical to device to screen here.        coor_DP2SP (pdc, &rc.left, &rc.top);        coor_DP2SP (pdc, &rc.right, &rc.bottom);    }    IntersectClipRect (&pdc->ecrgn, &rc);}void GUIAPI SelectClipRect (HDC hdc, const RECT* prc){    PDC pdc;    RECT rc;    pdc = dc_HDC2PDC(hdc);    if (prc) {        rc = *prc;        NormalizeRect (&rc);        if (IsRectEmpty (&rc))            return;    }    else         rc = pdc->DevRC;    if (dc_IsGeneralDC (pdc)) {        if (prc)            SetClipRgn (&pdc->lcrgn, &rc);        else            EmptyClipRgn (&pdc->lcrgn);#ifdef _REGION_DEBUG        fprintf (stderr, "\n----------------------------\n");        dumpRegion (&pdc->ecrgn);#endif        /* for general DC, regenerate effective region. */        LOCK (&pdc->pGCRInfo->lock);        dc_GenerateECRgn (pdc, TRUE);        UNLOCK (&pdc->pGCRInfo->lock);#ifdef _REGION_DEBUG        dumpRegion (&pdc->ecrgn);        fprintf (stderr, "----------------------------\n");#endif    }    else {        if (IntersectRect (&rc, &rc, &pdc->DevRC))            SetClipRgn (&pdc->ecrgn, &rc);        else            EmptyClipRgn (&pdc->ecrgn);    }}void GUIAPI SelectClipRegion (HDC hdc, const CLIPRGN* pRgn){    PDC pdc;    pdc = dc_HDC2PDC (hdc);    if (dc_IsGeneralDC (pdc)) {        ClipRgnCopy (&pdc->lcrgn, pRgn);        /* for general DC, regenerate effective region. */        LOCK (&pdc->pGCRInfo->lock);        dc_GenerateECRgn (pdc, TRUE);        UNLOCK (&pdc->pGCRInfo->lock);    }    else {        ClipRgnCopy (&pdc->ecrgn, pRgn);        IntersectClipRect (&pdc->ecrgn, &pdc->DevRC);    }}void GUIAPI GetBoundsRect (HDC hdc, RECT* pRect){    PDC pdc;    pdc = dc_HDC2PDC (hdc);    if (dc_IsGeneralDC (pdc))        *pRect = pdc->lcrgn.rcBound;    else        *pRect = pdc->ecrgn.rcBound;}BOOL GUIAPI PtVisible (HDC hdc, int x, int y){    PDC pdc;    pdc = dc_HDC2PDC(hdc);    if (dc_IsGeneralDC (pdc)) {        if (pdc->lcrgn.head == NULL)            return TRUE;        return PtInRegion (&pdc->lcrgn, x, y);    }    return PtInRegion (&pdc->ecrgn, x, y);}BOOL GUIAPI RectVisible(HDC hdc, const RECT* pRect){    PDC pdc;    pdc = dc_HDC2PDC(hdc);    if (dc_IsGeneralDC (pdc)) {        if (pdc->lcrgn.head == NULL)            return TRUE;        return RectInRegion (&pdc->lcrgn, pRect);    }    return RectInRegion (&pdc->ecrgn, pRect);}