зеркало из https://github.com/mozilla/gecko-dev.git
560 строки
22 KiB
C++
560 строки
22 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
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*
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsIDeviceContext_h___
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#define nsIDeviceContext_h___
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#include "nsISupports.h"
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#include "nsCoord.h"
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#include "nsRect.h"
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#include "nsIWidget.h"
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#include "nsIRenderingContext.h"
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class nsIView;
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class nsIFontMetrics;
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class nsIWidget;
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class nsIDeviceContextSpec;
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class nsIAtom;
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struct nsFont;
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struct nsColor;
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//a cross platform way of specifying a native device context
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typedef void * nsNativeDeviceContext;
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/* error codes for printer device contexts */
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#define NS_ERROR_GFX_PRINTER_BASE (1) /* adjustable :-) */
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/* Unix: print command (lp/lpr) not found */
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#define NS_ERROR_GFX_PRINTER_CMD_NOT_FOUND \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+1)
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/* Unix: print command returned an error */
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#define NS_ERROR_GFX_PRINTER_CMD_FAILURE \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+2)
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/* no printer available (e.g. cannot find _any_ printer) */
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#define NS_ERROR_GFX_PRINTER_NO_PRINTER_AVAILABLE \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+3)
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/* _specified_ (by name) printer not found */
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#define NS_ERROR_GFX_PRINTER_NAME_NOT_FOUND \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+4)
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/* access to printer denied */
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#define NS_ERROR_GFX_PRINTER_ACCESS_DENIED \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+5)
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/* invalid printer attribute (for example: unsupported paper size etc.) */
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#define NS_ERROR_GFX_PRINTER_INVALID_ATTRIBUTE \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+6)
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/* printer not "ready" (offline ?) */
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#define NS_ERROR_GFX_PRINTER_PRINTER_NOT_READY \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+8)
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/* printer out of paper */
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#define NS_ERROR_GFX_PRINTER_OUT_OF_PAPER \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+9)
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/* generic printer I/O error */
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#define NS_ERROR_GFX_PRINTER_PRINTER_IO_ERROR \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+10)
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/* print-to-file: could not open output file */
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#define NS_ERROR_GFX_PRINTER_COULD_NOT_OPEN_FILE \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+11)
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/* print-to-file: I/O error while printing to file */
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#define NS_ERROR_GFX_PRINTER_FILE_IO_ERROR \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+12)
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/* print preview: needs at least one printer */
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#define NS_ERROR_GFX_PRINTER_PRINTPREVIEW \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+13)
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/* print: starting document */
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#define NS_ERROR_GFX_PRINTER_STARTDOC \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+14)
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/* print: ending document */
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#define NS_ERROR_GFX_PRINTER_ENDDOC \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+15)
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/* print: starting page */
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#define NS_ERROR_GFX_PRINTER_STARTPAGE \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+16)
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/* print: ending page */
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#define NS_ERROR_GFX_PRINTER_ENDPAGE \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+17)
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/* print: print while in print preview */
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#define NS_ERROR_GFX_PRINTER_PRINT_WHILE_PREVIEW \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+18)
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/* requested page size not supported by printer */
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#define NS_ERROR_GFX_PRINTER_PAPER_SIZE_NOT_SUPPORTED \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+19)
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/* requested page orientation not supported */
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#define NS_ERROR_GFX_PRINTER_ORIENTATION_NOT_SUPPORTED \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+20)
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/* requested colorspace not supported (like printing "color" on a "grayscale"-only printer) */
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#define NS_ERROR_GFX_PRINTER_COLORSPACE_NOT_SUPPORTED \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+21)
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/* too many copies requested */
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#define NS_ERROR_GFX_PRINTER_TOO_MANY_COPIES \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+22)
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/* driver configuration error */
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#define NS_ERROR_GFX_PRINTER_DRIVER_CONFIGURATION_ERROR \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+23)
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/* Xprint module specific: Xprt server broken */
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#define NS_ERROR_GFX_PRINTER_XPRINT_BROKEN_XPRT \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+24)
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/* The document is still being loaded, can't Print Preview */
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#define NS_ERROR_GFX_PRINTER_DOC_IS_BUSY_PP \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+25)
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/* The document was asked to be destroyed while we were preparing printing */
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#define NS_ERROR_GFX_PRINTER_DOC_WAS_DESTORYED \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+26)
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/* Cannot Print or Print Preview XUL Documents */
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#define NS_ERROR_GFX_PRINTER_NO_XUL \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+27)
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/* The toolkit no longer supports the Print Dialog (for embedders) */
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#define NS_ERROR_GFX_NO_PRINTDIALOG_IN_TOOLKIT \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+28)
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/* The was wasn't any Print Prompt service registered (this shouldn't happen) */
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#define NS_ERROR_GFX_NO_PRINTROMPTSERVICE \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+29)
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/**
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* Conts need for Print Preview
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*/
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#ifdef NS_PRINT_PREVIEW
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const PRUint8 kUseAltDCFor_NONE = 0x00; // Do not use the AltDC for anything
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const PRUint8 kUseAltDCFor_FONTMETRICS = 0x01; // Use it for only getting the font metrics
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const PRUint8 kUseAltDCFor_CREATERC_REFLOW = 0x02; // Use when creating RenderingContexts for Reflow
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const PRUint8 kUseAltDCFor_CREATERC_PAINT = 0x04; // Use when creating RenderingContexts for Painting
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const PRUint8 kUseAltDCFor_SURFACE_DIM = 0x08; // Use it for getting the Surface Dimensions
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#endif
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#define NS_IDEVICE_CONTEXT_IID \
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{ 0x5931c580, 0xb917, 0x11d1, \
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{ 0xa8, 0x24, 0x00, 0x40, 0x95, 0x9a, 0x28, 0xc9 } }
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//a cross platform way of specifying a native palette handle
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typedef void * nsPalette;
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//structure used to return information about a device's palette capabilities
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struct nsPaletteInfo {
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PRPackedBool isPaletteDevice;
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PRUint16 sizePalette; // number of entries in the palette
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PRUint16 numReserved; // number of reserved palette entries
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nsPalette palette; // native palette handle
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};
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typedef enum {
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eSystemFont_Caption, // css2
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eSystemFont_Icon,
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eSystemFont_Menu,
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eSystemFont_MessageBox,
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eSystemFont_SmallCaption,
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eSystemFont_StatusBar,
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eSystemFont_Window, // css3
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eSystemFont_Document,
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eSystemFont_Workspace,
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eSystemFont_Desktop,
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eSystemFont_Info,
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eSystemFont_Dialog,
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eSystemFont_Button,
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eSystemFont_PullDownMenu,
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eSystemFont_List,
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eSystemFont_Field,
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eSystemFont_Tooltips, // moz
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eSystemFont_Widget
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} nsSystemFontID;
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class nsIDeviceContext : public nsISupports
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{
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_IDEVICE_CONTEXT_IID)
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/**
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* Initialize the device context from a widget
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* @param aWidget a native widget to initialize the device context from
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* @return error status
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*/
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NS_IMETHOD Init(nsNativeWidget aWidget) = 0;
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/**
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* Create a rendering context and initialize it from an nsIView
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* @param aView view to initialize context from
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* @param aContext out parameter for new rendering context
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* @return error status
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*/
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NS_IMETHOD CreateRenderingContext(nsIView *aView, nsIRenderingContext *&aContext) = 0;
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/**
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* Create a rendering context and initialize it from an nsDrawingSurface
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* @param nsDrawingSurface widget to initialize context from
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* @param aContext out parameter for new rendering context
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* @return error status
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*/
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NS_IMETHOD CreateRenderingContext(nsDrawingSurface aSurface, nsIRenderingContext *&aContext) = 0;
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/**
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* Create a rendering context and initialize it from an nsIWidget
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* @param aWidget widget to initialize context from
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* @param aContext out parameter for new rendering context
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* @return error status
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*/
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NS_IMETHOD CreateRenderingContext(nsIWidget *aWidget, nsIRenderingContext *&aContext) = 0;
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/**
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* Create a rendering context and initialize it. This API should *only* be called
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* on device contexts whose SupportsNativeWidgets() method return PR_FALSE.
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* @param aContext out parameter for new rendering context
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* @return error status
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*/
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NS_IMETHOD CreateRenderingContext(nsIRenderingContext *&aContext) = 0;
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/**
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* Create an uninitalised rendering context.
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* @param aContext out parameter for new rendering context
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* @return error status
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*/
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NS_IMETHOD CreateRenderingContextInstance(nsIRenderingContext *&aContext) = 0;
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/**
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* Query the device to see if it supports native widgets. If not, then
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* nsIWidget->Create() calls should be avoided.
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* @param aSupportsWidgets out paramater. If PR_TRUE, then native widgets
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* can be created.
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* @return error status
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*/
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NS_IMETHOD SupportsNativeWidgets(PRBool &aSupportsWidgets) = 0;
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/**
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* Obtain the size of a device unit relative to a Twip. A twip is 1/20 of
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* a point (which is 1/72 of an inch).
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* @param aDevUnitsToTwips out parameter for conversion value
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* @return error status
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*/
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NS_IMETHOD GetDevUnitsToTwips(float &aDevUnitsToTwips) const = 0;
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/**
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* Obtain the size of a Twip relative to a device unit.
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* @param aTwipsToDevUnits out parameter for conversion value
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* @return error status
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*/
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NS_IMETHOD GetTwipsToDevUnits(float &aTwipsToDevUnits) const = 0;
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/**
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* Set the scale factor to convert units used by the application
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* to device units. Typically, an application will query the device
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* for twips to device units scale and then set the scale
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* to convert from whatever unit the application wants to use
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* to device units. From that point on, all other parts of the
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* app can use the Get* methods below to figure out how
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* to convert device units <-> app units.
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* @param aAppUnits scale value to convert from application defined
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* units to device units.
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* @return error status
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*/
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NS_IMETHOD SetAppUnitsToDevUnits(float aAppUnits) = 0;
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/**
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* Set the scale factor to convert device units to units
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* used by the application. This should generally be
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* 1.0f / the value passed into SetAppUnitsToDevUnits().
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* @param aDevUnits scale value to convert from device units to
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* application defined units
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* @return error status
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*/
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NS_IMETHOD SetDevUnitsToAppUnits(float aDevUnits) = 0;
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/**
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* Get the scale factor to convert from application defined
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* units to device units.
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* @param aAppUnits out paramater for scale value
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* @return error status
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*/
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NS_IMETHOD GetAppUnitsToDevUnits(float &aAppUnits) const = 0;
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/**
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* Get the scale factor to convert from device units to
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* application defined units.
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* @param aDevUnits out paramater for scale value
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* @return error status
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*/
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NS_IMETHOD GetDevUnitsToAppUnits(float &aDevUnits) const = 0;
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/**
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* Get the value used to scale a "standard" pixel to a pixel
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* of the same physical size for this device. a standard pixel
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* is defined as a pixel on display 0. this is used to make
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* sure that entities defined in pixel dimensions maintain a
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* constant relative size when displayed from one output
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* device to another.
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* @param aScale out parameter for scale value
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* @return error status
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*/
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NS_IMETHOD GetCanonicalPixelScale(float &aScale) const = 0;
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/**
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* Get the value used to scale a "standard" pixel to a pixel
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* of the same physical size for this device. a standard pixel
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* is defined as a pixel on display 0. this is used to make
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* sure that entities defined in pixel dimensions maintain a
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* constant relative size when displayed from one output
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* device to another.
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* @param aScale in parameter for scale value
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* @return error status
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*/
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NS_IMETHOD SetCanonicalPixelScale(float aScale) = 0;
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/**
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* Get the width of a vertical scroll bar and the height
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* of a horizontal scrollbar in application units.
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* @param aWidth out parameter for width
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* @param aHeight out parameter for height
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* @return error status
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*/
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NS_IMETHOD GetScrollBarDimensions(float &aWidth, float &aHeight) const = 0;
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/**
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* Fill in an nsFont based on the ID of a system font. This function
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* may or may not fill in the size, so the size should be set to a
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* reasonable default before calling.
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*
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* @param aID The system font ID.
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* @param aInfo The font structure to be filled in.
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* @return error status
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*/
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NS_IMETHOD GetSystemFont(nsSystemFontID aID, nsFont *aFont) const = 0;
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/**
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* Get the nsIFontMetrics that describe the properties of
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* an nsFont.
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* @param aFont font description to obtain metrics for
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* @param aLangGroup the language group of the document
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* @param aMetrics out parameter for font metrics
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* @return error status
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*/
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NS_IMETHOD GetMetricsFor(const nsFont& aFont, nsIAtom* aLangGroup,
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nsIFontMetrics*& aMetrics) = 0;
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/**
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* Get the nsIFontMetrics that describe the properties of
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* an nsFont.
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* @param aFont font description to obtain metrics for
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* @param aMetrics out parameter for font metrics
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* @return error status
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*/
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NS_IMETHOD GetMetricsFor(const nsFont& aFont, nsIFontMetrics*& aMetrics) = 0;
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//get and set the document zoom value used for display-time
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//scaling. default is 1.0 (no zoom)
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NS_IMETHOD SetZoom(float aZoom) = 0;
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NS_IMETHOD GetZoom(float &aZoom) const = 0;
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//get and set the text zoom value used for display-time scaling.
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//default is 1.0 (no zoom). The device context doesn't do anything
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//with this value. It's merely a convenient place to store it.
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NS_IMETHOD SetTextZoom(float aTextZoom) = 0;
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NS_IMETHOD GetTextZoom(float &aTextZoom) const = 0;
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//get a low level drawing surface for rendering. the rendering context
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//that is passed in is used to create the drawing surface if there isn't
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//already one in the device context. the drawing surface is then cached
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//in the device context for re-use.
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NS_IMETHOD GetDrawingSurface(nsIRenderingContext &aContext, nsDrawingSurface &aSurface) = 0;
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/**
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* Check to see if a particular named font exists.
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* @param aFontName character string of font face name
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* @return NS_OK if font is available, else font is unavailable
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*/
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NS_IMETHOD CheckFontExistence(const nsString& aFaceName) = 0;
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NS_IMETHOD FirstExistingFont(const nsFont& aFont, nsString& aFaceName) = 0;
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NS_IMETHOD GetLocalFontName(const nsString& aFaceName, nsString& aLocalName,
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PRBool& aAliased) = 0;
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/**
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* Notification when a font metrics instance created for this device is
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* about to be deleted
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*/
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NS_IMETHOD FontMetricsDeleted(const nsIFontMetrics* aFontMetrics) = 0;
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/**
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* Attempt to free up resoruces by flushing out any fonts no longer
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* referenced by anything other than the font cache itself.
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* @return error status
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*/
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NS_IMETHOD FlushFontCache(void) = 0;
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/**
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* Return the bit depth of the device.
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*/
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NS_IMETHOD GetDepth(PRUint32& aDepth) = 0;
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/**
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* Returns information about the device's palette capabilities.
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*/
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NS_IMETHOD GetPaletteInfo(nsPaletteInfo& aPaletteInfo) = 0;
|
|
|
|
/**
|
|
* Returns Platform specific pixel value for an RGB value
|
|
*/
|
|
NS_IMETHOD ConvertPixel(nscolor aColor, PRUint32 & aPixel) = 0;
|
|
|
|
/**
|
|
* Get the size of the displayable area of the output device
|
|
* in app units.
|
|
* @param aWidth out parameter for width
|
|
* @param aHeight out parameter for height
|
|
* @return error status
|
|
*/
|
|
NS_IMETHOD GetDeviceSurfaceDimensions(PRInt32 &aWidth, PRInt32 &aHeight) = 0;
|
|
|
|
/**
|
|
* Get the size of the content area of the output device in app units.
|
|
* This corresponds on a screen device, for instance, to the entire screen.
|
|
* @param aRect out parameter for full rect. Position (x,y) will be (0,0) or
|
|
* relative to the primary monitor if this is not the primary.
|
|
* @return error status
|
|
*/
|
|
NS_IMETHOD GetRect ( nsRect &aRect ) = 0;
|
|
|
|
/**
|
|
* Get the size of the content area of the output device in app units.
|
|
* This corresponds on a screen device, for instance, to the area reported
|
|
* by GetDeviceSurfaceDimensions, minus the taskbar (Windows) or menubar
|
|
* (Macintosh).
|
|
* @param aRect out parameter for client rect. Position (x,y) will be (0,0)
|
|
* adjusted for any upper/left non-client space if present or
|
|
* relative to the primary monitor if this is not the primary.
|
|
* @return error status
|
|
*/
|
|
NS_IMETHOD GetClientRect(nsRect &aRect) = 0;
|
|
|
|
/**
|
|
* Returns a new nsIDeviceContext suitable for the device context
|
|
* specification passed in.
|
|
* @param aDevice a device context specification. this is a platform
|
|
* specific structure that only a platform specific device
|
|
* context can interpret.
|
|
* @param aContext out parameter for new device context. nsnull on
|
|
* failure to create new device context.
|
|
* @return error status
|
|
*/
|
|
NS_IMETHOD GetDeviceContextFor(nsIDeviceContextSpec *aDevice,
|
|
nsIDeviceContext *&aContext) = 0;
|
|
|
|
/**
|
|
* This is enables the DeviceContext to anything it needs to do for Printing
|
|
* before Reflow and BeginDocument is where work can be done after reflow.
|
|
* @param aTitle - itle of Document
|
|
* @param aPrintToFileName - name of file to print to, if NULL then don't print to file
|
|
*
|
|
* @return error status
|
|
*/
|
|
NS_IMETHOD PrepareDocument(PRUnichar * aTitle,
|
|
PRUnichar* aPrintToFileName) = 0;
|
|
|
|
//XXX need to work out re-entrancy issues for these APIs... MMP
|
|
/**
|
|
* Inform the output device that output of a document is beginning
|
|
* Used for print related device contexts. Must be matched 1:1 with
|
|
* EndDocument().
|
|
* XXX needs to take parameters so that feedback can be given to the
|
|
* app regarding pagination progress and aborting print operations?
|
|
*
|
|
* @param aTitle - itle of Document
|
|
* @param aPrintToFileName - name of file to print to, if NULL then don't print to file
|
|
* @param aStartPage - starting page number (must be greater than zero)
|
|
* @param aEndPage - ending page number (must be less than or equal to number of pages)
|
|
*
|
|
* @return error status
|
|
*/
|
|
NS_IMETHOD BeginDocument(PRUnichar* aTitle,
|
|
PRUnichar* aPrintToFileName,
|
|
PRInt32 aStartPage,
|
|
PRInt32 aEndPage) = 0;
|
|
|
|
/**
|
|
* Inform the output device that output of a document is ending.
|
|
* Used for print related device contexts. Must be matched 1:1 with
|
|
* BeginDocument()
|
|
* @return error status
|
|
*/
|
|
NS_IMETHOD EndDocument(void) = 0;
|
|
|
|
/**
|
|
* Inform the output device that output of a document is being aborted.
|
|
* Must be matched 1:1 with BeginDocument()
|
|
* @return error status
|
|
*/
|
|
NS_IMETHOD AbortDocument(void) = 0;
|
|
|
|
/**
|
|
* Inform the output device that output of a page is beginning
|
|
* Used for print related device contexts. Must be matched 1:1 with
|
|
* EndPage() and within a BeginDocument()/EndDocument() pair.
|
|
* @return error status
|
|
*/
|
|
NS_IMETHOD BeginPage(void) = 0;
|
|
|
|
/**
|
|
* Inform the output device that output of a page is ending
|
|
* Used for print related device contexts. Must be matched 1:1 with
|
|
* BeginPage() and within a BeginDocument()/EndDocument() pair.
|
|
* @return error status
|
|
*/
|
|
NS_IMETHOD EndPage(void) = 0;
|
|
|
|
#ifdef NS_PRINT_PREVIEW
|
|
/**
|
|
* Set an Alternative Device Context where some of the calls
|
|
* are deferred to it
|
|
*/
|
|
NS_IMETHOD SetAltDevice(nsIDeviceContext* aAltDC) = 0;
|
|
|
|
/**
|
|
* Get the Alternate Device Context
|
|
*/
|
|
NS_IMETHOD GetAltDevice(nsIDeviceContext** aAltDC) = 0;
|
|
|
|
/**
|
|
* Turn on/off which types of information is retrived
|
|
* via the alt device context
|
|
*/
|
|
NS_IMETHOD SetUseAltDC(PRUint8 aValue, PRBool aOn) = 0;
|
|
#endif
|
|
|
|
};
|
|
|
|
#endif /* nsIDeviceContext_h___ */
|