зеркало из https://github.com/mozilla/gecko-dev.git
511 строки
20 KiB
C++
511 строки
20 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: MPL 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 Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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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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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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 MPL, 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 MPL, 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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// XXX we need only gfxTypes.h, but we cannot include it directly.
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#include "gfxPoint.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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//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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/* 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+24)
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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+25)
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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+26)
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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+27)
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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+28)
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/* requested plex mode not supported by printer */
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#define NS_ERROR_GFX_PRINTER_PLEX_NOT_SUPPORTED \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+29)
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/* The document is still being loaded */
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#define NS_ERROR_GFX_PRINTER_DOC_IS_BUSY \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+30)
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/* Printing is not implemented */
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#define NS_ERROR_GFX_PRINTING_NOT_IMPLEMENTED \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+31)
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/* Cannot load the matching print module */
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#define NS_ERROR_GFX_COULD_NOT_LOAD_PRINT_MODULE \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+32)
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/* requested resolution/quality mode not supported by printer */
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#define NS_ERROR_GFX_PRINTER_RESOLUTION_NOT_SUPPORTED \
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NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+33)
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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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// 4dd372b6-ef19-4995-a7ac-ba3efd3f656f
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#define NS_IDEVICE_CONTEXT_IID \
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{ 0x4dd372b6, 0xef19, 0x4995, \
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{ 0xa7, 0xac, 0xba, 0x3e, 0xfd, 0x3f, 0x65, 0x6f } }
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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_DECLARE_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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* Initialize the device context from a device context spec
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* @param aDevSpec the specification of the printng device (platform-specific)
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* @return error status
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*/
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NS_IMETHOD InitForPrinting(nsIDeviceContextSpec* aDevSpec) = 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 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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* We are in the process of creating the native widget for aWidget.
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* Do any device-specific processing required to initialize the
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* native widget for this device. A pointer to some platform-specific data is
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* returned in aOut.
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*
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* GTK2 calls this to get the required visual for the window.
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*/
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NS_IMETHOD PrepareNativeWidget(nsIWidget* aWidget, void** aOut) = 0;
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/**
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* Gets the number of app units in one CSS pixel; this number is global,
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* not unique to each device context.
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*/
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static PRInt32 AppUnitsPerCSSPixel() { return 60; }
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/**
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* Convert app units to CSS pixels which is used in gfx/thebes.
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*/
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static gfxFloat AppUnitsToGfxCSSPixels(nscoord aAppUnits)
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{ return gfxFloat(aAppUnits) / AppUnitsPerCSSPixel(); }
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/**
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* Gets the number of app units in one device pixel; this number is usually
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* a factor of AppUnitsPerCSSPixel(), although that is not guaranteed.
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*/
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PRInt32 AppUnitsPerDevPixel() const { return mAppUnitsPerDevPixel; }
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/**
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* Convert app units to device pixels which is used in gfx/thebes.
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*/
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gfxFloat AppUnitsToGfxUnits(nscoord aAppUnits) const
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{ return gfxFloat(aAppUnits) / AppUnitsPerDevPixel(); }
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/**
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* Gets the number of app units in one inch; this is the device's DPI
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* times AppUnitsPerDevPixel().
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*/
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PRInt32 AppUnitsPerInch() const { return mAppUnitsPerInch; }
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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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/**
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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;
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/**
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* Get the size of the displayable area of the output device
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* in app 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 GetDeviceSurfaceDimensions(nscoord &aWidth, nscoord &aHeight) = 0;
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/**
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* Get the size of the content area of the output device in app units.
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* This corresponds on a screen device, for instance, to the entire screen.
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* @param aRect out parameter for full rect. Position (x,y) will be (0,0) or
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* relative to the primary monitor if this is not the primary.
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* @return error status
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*/
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NS_IMETHOD GetRect ( nsRect &aRect ) = 0;
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/**
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* Get the size of the content area of the output device in app units.
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* This corresponds on a screen device, for instance, to the area reported
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* by GetDeviceSurfaceDimensions, minus the taskbar (Windows) or menubar
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* (Macintosh).
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* @param aRect out parameter for client rect. Position (x,y) will be (0,0)
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* adjusted for any upper/left non-client space if present or
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* relative to the primary monitor if this is not the primary.
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* @return error status
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*/
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NS_IMETHOD GetClientRect(nsRect &aRect) = 0;
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/**
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* This is enables the DeviceContext to anything it needs to do for Printing
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* before Reflow and BeginDocument is where work can be done after reflow.
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* @param aTitle - itle of Document
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* @param aPrintToFileName - name of file to print to, if NULL then don't print to file
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*
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* @return error status
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*/
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NS_IMETHOD PrepareDocument(PRUnichar * aTitle,
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PRUnichar* aPrintToFileName) = 0;
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//XXX need to work out re-entrancy issues for these APIs... MMP
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/**
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* Inform the output device that output of a document is beginning
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* Used for print related device contexts. Must be matched 1:1 with
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* EndDocument().
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* XXX needs to take parameters so that feedback can be given to the
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* app regarding pagination progress and aborting print operations?
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*
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* @param aTitle - itle of Document
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* @param aPrintToFileName - name of file to print to, if NULL then don't print to file
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* @param aStartPage - starting page number (must be greater than zero)
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* @param aEndPage - ending page number (must be less than or equal to number of pages)
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*
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* @return error status
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*/
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NS_IMETHOD BeginDocument(PRUnichar* aTitle,
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PRUnichar* aPrintToFileName,
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PRInt32 aStartPage,
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PRInt32 aEndPage) = 0;
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/**
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* Inform the output device that output of a document is ending.
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* Used for print related device contexts. Must be matched 1:1 with
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* BeginDocument()
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* @return error status
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*/
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NS_IMETHOD EndDocument(void) = 0;
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/**
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* Inform the output device that output of a document is being aborted.
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* Must be matched 1:1 with BeginDocument()
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* @return error status
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*/
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NS_IMETHOD AbortDocument(void) = 0;
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/**
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* Inform the output device that output of a page is beginning
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* Used for print related device contexts. Must be matched 1:1 with
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* EndPage() and within a BeginDocument()/EndDocument() pair.
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* @return error status
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*/
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NS_IMETHOD BeginPage(void) = 0;
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/**
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* Inform the output device that output of a page is ending
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* Used for print related device contexts. Must be matched 1:1 with
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* BeginPage() and within a BeginDocument()/EndDocument() pair.
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* @return error status
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*/
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NS_IMETHOD EndPage(void) = 0;
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/**
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* Clear cached system fonts (refresh from theme when
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* requested). This method is effectively static,
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* and can be called on a new DeviceContext instance
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* without any initialization. Only really used by
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* Gtk native theme stuff.
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*/
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NS_IMETHOD ClearCachedSystemFonts() = 0;
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/**
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* Check to see if the DPI has changed
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* @return whether there was actually a change in the DPI
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* (whether AppUnitsPerDevPixel() or AppUnitsPerInch() changed)
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*/
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virtual PRBool CheckDPIChange() = 0;
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/**
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* Set the pixel scaling factor: all lengths are multiplied by this factor
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* when we convert them to device pixels. Returns whether the ratio of
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* app units to dev pixels changed because of the scale factor.
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*/
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virtual PRBool SetPixelScale(float aScale) = 0;
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/**
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* Get the pixel scaling factor; defaults to 1.0, but can be changed with
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* SetPixelScale.
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*/
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float GetPixelScale() const { return mPixelScale; }
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/**
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* Get the unscaled ratio of app units to dev pixels; useful if something
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* needs to be converted from to unscaled pixels
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*/
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PRInt32 UnscaledAppUnitsPerDevPixel() const { return mAppUnitsPerDevNotScaledPixel; }
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protected:
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PRInt32 mAppUnitsPerDevPixel;
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PRInt32 mAppUnitsPerInch;
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PRInt32 mAppUnitsPerDevNotScaledPixel;
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float mPixelScale;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIDeviceContext, NS_IDEVICE_CONTEXT_IID)
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#endif /* nsIDeviceContext_h___ */
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