158 lines
3.0 KiB
C
158 lines
3.0 KiB
C
/*
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* USER DCE functions
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*
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* Copyright 1993 Alexandre Julliard
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*/
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static char Copyright[] = "Copyright Alexandre Julliard, 1993";
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#include "dce.h"
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#include "win.h"
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#include "gdi.h"
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#define NB_DCE 5 /* Number of DCEs created at startup */
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extern Display * XT_display;
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extern Screen * XT_screen;
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static HANDLE firstDCE = 0;
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static HDC defaultDCstate = 0;
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/***********************************************************************
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* DCE_Init
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*/
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void DCE_Init()
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{
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int i;
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HANDLE handle;
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DCE * dce;
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for (i = 0; i < NB_DCE; i++)
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{
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handle = GlobalAlloc( GMEM_MOVEABLE, sizeof(DCE) );
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if (!handle) return;
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dce = (DCE *) GlobalLock( handle );
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dce->hdc = CreateDC( "DISPLAY", NULL, NULL, NULL );
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if (!dce->hdc)
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{
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GlobalUnlock( handle );
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GlobalFree( handle );
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return;
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}
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dce->hwndCurrent = 0;
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dce->flags = 0;
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dce->inUse = FALSE;
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dce->xOrigin = 0;
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dce->yOrigin = 0;
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dce->hNext = firstDCE;
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firstDCE = handle;
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if (!defaultDCstate) defaultDCstate = GetDCState( dce->hdc );
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GlobalUnlock( handle );
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}
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}
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/***********************************************************************
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* GetDC (USER.66)
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*/
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HDC GetDC( HWND hwnd )
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{
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HANDLE hdce, next;
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HDC hdc;
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DCE * dce;
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DC * dc;
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WND * wndPtr = NULL;
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if (hwnd)
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{
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wndPtr = WIN_FindWndPtr( hwnd );
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if (!wndPtr) return 0;
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}
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for (hdce = firstDCE; (hdce); hdce = next)
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{
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dce = (DCE *) GlobalLock( hdce );
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if (!dce) return 0;
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if (!dce->inUse) break;
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next = dce->hNext;
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GlobalUnlock( hdce );
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}
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if (!hdce)
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{
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if (hwnd) GlobalUnlock( hwnd );
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return 0;
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}
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/* Initialize DC */
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dc = (DC *) GDI_GetObjPtr( dce->hdc, DC_MAGIC );
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if (!dc)
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{
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if (hwnd) GlobalUnlock( hwnd );
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return 0;
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}
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if (wndPtr)
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{
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dc->u.x.drawable = XtWindow( wndPtr->winWidget );
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dc->u.x.widget = wndPtr->winWidget;
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}
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else
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{
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dc->u.x.drawable = DefaultRootWindow( XT_display );
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dc->u.x.widget = 0;
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}
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SetDCState( dce->hdc, defaultDCstate );
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dce->hwndCurrent = hwnd;
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dce->inUse = TRUE;
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hdc = dce->hdc;
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GlobalUnlock( hdce );
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if (hwnd) GlobalUnlock( hwnd );
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#ifdef DEBUG_WIN
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printf( "GetDC(%d): returning %d\n", hwnd, hdc );
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#endif
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return hdc;
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}
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/***********************************************************************
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* ReleaseDC (USER.68)
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*/
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int ReleaseDC( HWND hwnd, HDC hdc )
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{
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HANDLE hdce, next;
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DCE * dce;
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WND * wndPtr = NULL;
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#ifdef DEBUG_WIN
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printf( "ReleaseDC: %d %d\n", hwnd, hdc );
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#endif
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if (hwnd)
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{
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wndPtr = WIN_FindWndPtr( hwnd );
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if (!wndPtr) return 0;
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}
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for (hdce = firstDCE; (hdce); hdce = next)
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{
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dce = (DCE *) GlobalLock( hdce );
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if (!dce) return 0;
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if (dce->inUse && (dce->hdc == hdc)) break;
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next = dce->hNext;
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GlobalUnlock( hdce );
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}
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if (hdce)
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{
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dce->inUse = FALSE;
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GlobalUnlock( hdce );
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}
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if (hwnd) GlobalUnlock( hwnd );
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return (hdce != 0);
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}
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