gecko-dev/gfx/public/nsDeviceContext.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Roland Mainz <Roland.Mainz@informatik.med.uni-giessen.de>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsDeviceContext_h___
#define nsDeviceContext_h___
#include "nsIDeviceContext.h"
#include "nsIDeviceContextSpec.h"
#include "nsCOMPtr.h"
#include "nsIAtom.h"
#include "nsVoidArray.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsWeakReference.h"
#include "gfxCore.h"
class nsIImageRequest;
class nsHashtable;
class NS_GFX nsFontCache
{
public:
nsFontCache();
virtual ~nsFontCache();
virtual nsresult Init(nsIDeviceContext* aContext);
virtual nsresult GetDeviceContext(nsIDeviceContext *&aContext) const;
virtual nsresult GetMetricsFor(const nsFont& aFont, nsIAtom* aLangGroup,
nsIFontMetrics *&aMetrics);
nsresult FontMetricsDeleted(const nsIFontMetrics* aFontMetrics);
nsresult Compact();
nsresult Flush();
/* printer device context classes may create their own
* subclasses of nsFontCache (and override this method) and override
* DeviceContextImpl::CreateFontCache (see bug 81311).
*/
virtual nsresult CreateFontMetricsInstance(nsIFontMetrics** fm);
protected:
nsVoidArray mFontMetrics;
nsIDeviceContext *mContext; // we do not addref this since
// ownership is implied. MMP.
};
#undef IMETHOD_VISIBILITY
#define IMETHOD_VISIBILITY NS_VISIBILITY_DEFAULT
class NS_GFX DeviceContextImpl : public nsIDeviceContext,
public nsIObserver,
public nsSupportsWeakReference
{
public:
DeviceContextImpl();
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
NS_IMETHOD Init(nsNativeWidget aWidget);
NS_IMETHOD CreateRenderingContext(nsIView *aView, nsIRenderingContext *&aContext);
NS_IMETHOD CreateRenderingContext(nsIWidget *aWidget, nsIRenderingContext *&aContext);
NS_IMETHOD CreateRenderingContext(nsIRenderingContext *&aContext){return NS_ERROR_NOT_IMPLEMENTED;}
NS_IMETHOD CreateRenderingContext(nsIDrawingSurface* aSurface, nsIRenderingContext *&aContext);
NS_IMETHOD CreateRenderingContextInstance(nsIRenderingContext *&aContext);
NS_IMETHOD GetCanonicalPixelScale(float &aScale) const;
NS_IMETHOD SetCanonicalPixelScale(float aScale);
NS_IMETHOD GetMetricsFor(const nsFont& aFont, nsIAtom* aLangGroup,
nsIFontMetrics*& aMetrics);
NS_IMETHOD GetMetricsFor(const nsFont& aFont, nsIFontMetrics*& aMetrics);
NS_IMETHOD SetZoom(float aZoom);
NS_IMETHOD GetZoom(float &aZoom) const;
NS_IMETHOD SetTextZoom(float aTextZoom);
NS_IMETHOD GetTextZoom(float &aTextZoom) const;
NS_IMETHOD FirstExistingFont(const nsFont& aFont, nsString& aFaceName);
NS_IMETHOD GetLocalFontName(const nsString& aFaceName, nsString& aLocalName,
PRBool& aAliased);
NS_IMETHOD CreateFontCache();
NS_IMETHOD FontMetricsDeleted(const nsIFontMetrics* aFontMetrics);
NS_IMETHOD FlushFontCache(void);
NS_IMETHOD GetDepth(PRUint32& aDepth);
NS_IMETHOD GetPaletteInfo(nsPaletteInfo& aPaletteInfo);
NS_IMETHOD PrepareDocument(PRUnichar * aTitle,
PRUnichar* aPrintToFileName) { return NS_OK; }
NS_IMETHOD AbortDocument(void) { return NS_OK; }
#ifdef NS_PRINT_PREVIEW
NS_IMETHOD SetAltDevice(nsIDeviceContext* aAltDC);
NS_IMETHOD GetAltDevice(nsIDeviceContext** aAltDC) { *aAltDC = mAltDC.get(); NS_IF_ADDREF(*aAltDC); return NS_OK;}
NS_IMETHOD SetUseAltDC(PRUint8 aValue, PRBool aOn);
#endif
private:
/* Helper methods for |CreateRenderingContext|&co. */
nsresult InitRenderingContext(nsIRenderingContext *aContext, nsIWidget *aWindow);
nsresult InitRenderingContext(nsIRenderingContext *aContext, nsIDrawingSurface* aSurface);
protected:
virtual ~DeviceContextImpl();
void CommonInit(void);
nsresult CreateIconILGroupContext();
virtual nsresult CreateFontAliasTable();
nsresult AliasFont(const nsString& aFont,
const nsString& aAlias, const nsString& aAltAlias,
PRBool aForceAlias);
void GetLocaleLangGroup(void);
nsFontCache *mFontCache;
nsCOMPtr<nsIAtom> mLocaleLangGroup; // XXX temp fix for performance bug - erik
float mZoom;
float mTextZoom;
nsHashtable* mFontAliasTable;
float mCPixelScale;
#ifdef NS_PRINT_PREVIEW
nsCOMPtr<nsIDeviceContext> mAltDC;
PRUint8 mUseAltDC;
#endif
public:
nsNativeWidget mWidget;
#ifdef NS_DEBUG
PRBool mInitialized;
#endif
};
#undef IMETHOD_VISIBILITY
#define IMETHOD_VISIBILITY NS_VISIBILITY_HIDDEN
#endif /* nsDeviceContext_h___ */