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lightning-sunbird  0.9+nobinonly
nsCairoSurfaceManager.cpp
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00001 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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00014  *
00015  * The Original Code is mozilla.org code.
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00017  * The Initial Developer of the Original Code is
00018  * mozilla.org.
00019  * Portions created by the Initial Developer are Copyright (C) 2004
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Stuart Parmenter <pavlov@pavlov.net>
00024  *   Vladimir Vukicevic <vladimir@pobox.com>
00025  *
00026  * Alternatively, the contents of this file may be used under the terms of
00027  * either the GNU General Public License Version 2 or later (the "GPL"), or
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00038  * ***** END LICENSE BLOCK ***** */
00039 
00040 #include "nsIWidget.h"
00041 
00042 #include "nsCairoSurfaceManager.h"
00043 #include "nsCairoDrawingSurface.h"
00044 
00045 nsCairoSurfaceManager::nsCairoSurfaceManager()
00046 {
00047 }
00048 
00049 nsCairoSurfaceManager::~nsCairoSurfaceManager()
00050 {
00051     FlushCachedSurfaces();
00052 }
00053 
00054 NS_IMETHODIMP
00055 nsCairoSurfaceManager::FlushCachedSurfaces()
00056 {
00057     for (WidgetToSurfaceMap::iterator iter = mSurfaceMap.begin();
00058          iter != mSurfaceMap.end();
00059          iter++)
00060     {
00061         nsCairoDrawingSurface *surf = (iter->second);
00062         NS_RELEASE(surf);
00063     }
00064 
00065     mSurfaceMap.clear();
00066 
00067     return NS_OK;
00068 }
00069 
00070 NS_IMETHODIMP
00071 nsCairoSurfaceManager::GetDrawingSurfaceForWidget (nsCairoDeviceContext *aDC,
00072                                                    nsIWidget *aWidget,
00073                                                    nsIDrawingSurface **aSurface)
00074 {
00075     nsNativeWidget nativeWidget = aWidget->GetNativeData(NS_NATIVE_WIDGET);
00076 
00077     return GetDrawingSurfaceForNativeWidget (aDC, nativeWidget, aSurface);
00078 }
00079 
00080 NS_IMETHODIMP
00081 nsCairoSurfaceManager::GetDrawingSurfaceForNativeWidget (nsCairoDeviceContext *aDC,
00082                                                          nsNativeWidget aWidget,
00083                                                          nsIDrawingSurface **aSurface)
00084 {
00085     nsCairoDrawingSurface *surf = nsnull;
00086     WidgetToSurfaceMap::iterator iter = mSurfaceMap.find(aWidget);
00087 
00088     /* cached? */
00089     if (PR_TRUE || iter == mSurfaceMap.end()) {
00090         /* nope. */
00091         surf = new nsCairoDrawingSurface();
00092         NS_ADDREF(surf);         // our own reference for map
00093         surf->Init (aDC, aWidget);
00094 
00095         mSurfaceMap.insert(WidgetToSurfaceMap::value_type (aWidget, surf));
00096     } else {
00097         surf = (iter->second);
00098     }
00099 
00100     *aSurface = surf;
00101     NS_ADDREF(*aSurface);
00102     return NS_OK;
00103 }
00104 
00105 NS_IMETHODIMP
00106 nsCairoSurfaceManager::ReleaseSurface (nsIDrawingSurface *aSurface)
00107 {
00108     nsCairoDrawingSurface *cds = NS_STATIC_CAST(nsCairoDrawingSurface*, aSurface);
00109     nsNativeWidget nw = cds->GetNativeWidget();
00110 
00111     WidgetToSurfaceMap::iterator iter = mSurfaceMap.find(nw);
00112     if (iter == mSurfaceMap.end()) {
00113         // ?!
00114         return NS_OK;
00115     }
00116 
00117     PRUint32 refcnt;
00118     NS_RELEASE2(cds, refcnt);
00119 
00120     if (refcnt == 0) {
00121         mSurfaceMap.erase (iter);
00122     }
00123 }