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pjs/gfx/public/nsIDeviceContext.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 nsIDeviceContext_h___
#define nsIDeviceContext_h___
#include "nsISupports.h"
#include "nsCoord.h"
#include "nsRect.h"
#include "nsIWidget.h"
#include "nsIRenderingContext.h"
class nsIView;
class nsIFontMetrics;
class nsIWidget;
class nsIDeviceContextSpec;
class nsIAtom;
struct nsFont;
struct nsColor;
//a cross platform way of specifying a native device context
typedef void * nsNativeDeviceContext;
/* error codes for printer device contexts */
#define NS_ERROR_GFX_PRINTER_BASE (1) /* adjustable :-) */
/* Unix: print command (lp/lpr) not found */
#define NS_ERROR_GFX_PRINTER_CMD_NOT_FOUND \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+1)
/* Unix: print command returned an error */
#define NS_ERROR_GFX_PRINTER_CMD_FAILURE \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+2)
/* no printer available (e.g. cannot find _any_ printer) */
#define NS_ERROR_GFX_PRINTER_NO_PRINTER_AVAILABLE \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+3)
/* _specified_ (by name) printer not found */
#define NS_ERROR_GFX_PRINTER_NAME_NOT_FOUND \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+4)
/* access to printer denied */
#define NS_ERROR_GFX_PRINTER_ACCESS_DENIED \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+5)
/* invalid printer attribute (for example: unsupported paper size etc.) */
#define NS_ERROR_GFX_PRINTER_INVALID_ATTRIBUTE \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+6)
/* printer not "ready" (offline ?) */
#define NS_ERROR_GFX_PRINTER_PRINTER_NOT_READY \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+8)
/* printer out of paper */
#define NS_ERROR_GFX_PRINTER_OUT_OF_PAPER \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+9)
/* generic printer I/O error */
#define NS_ERROR_GFX_PRINTER_PRINTER_IO_ERROR \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+10)
/* print-to-file: could not open output file */
#define NS_ERROR_GFX_PRINTER_COULD_NOT_OPEN_FILE \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+11)
/* print-to-file: I/O error while printing to file */
#define NS_ERROR_GFX_PRINTER_FILE_IO_ERROR \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+12)
/* print preview: needs at least one printer */
#define NS_ERROR_GFX_PRINTER_PRINTPREVIEW \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+13)
/* print: starting document */
#define NS_ERROR_GFX_PRINTER_STARTDOC \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+14)
/* print: ending document */
#define NS_ERROR_GFX_PRINTER_ENDDOC \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+15)
/* print: starting page */
#define NS_ERROR_GFX_PRINTER_STARTPAGE \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+16)
/* print: ending page */
#define NS_ERROR_GFX_PRINTER_ENDPAGE \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+17)
/* print: print while in print preview */
#define NS_ERROR_GFX_PRINTER_PRINT_WHILE_PREVIEW \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+18)
/* requested page size not supported by printer */
#define NS_ERROR_GFX_PRINTER_PAPER_SIZE_NOT_SUPPORTED \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+19)
/* requested page orientation not supported */
#define NS_ERROR_GFX_PRINTER_ORIENTATION_NOT_SUPPORTED \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+20)
/* requested colorspace not supported (like printing "color" on a "grayscale"-only printer) */
#define NS_ERROR_GFX_PRINTER_COLORSPACE_NOT_SUPPORTED \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+21)
/* too many copies requested */
#define NS_ERROR_GFX_PRINTER_TOO_MANY_COPIES \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+22)
/* driver configuration error */
#define NS_ERROR_GFX_PRINTER_DRIVER_CONFIGURATION_ERROR \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+23)
/* Xprint module specific: Xprt server broken */
#define NS_ERROR_GFX_PRINTER_XPRINT_BROKEN_XPRT \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+24)
/* The document is still being loaded, can't Print Preview */
#define NS_ERROR_GFX_PRINTER_DOC_IS_BUSY_PP \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+25)
/* The document was asked to be destroyed while we were preparing printing */
#define NS_ERROR_GFX_PRINTER_DOC_WAS_DESTORYED \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+26)
/* Cannot Print or Print Preview XUL Documents */
#define NS_ERROR_GFX_PRINTER_NO_XUL \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+27)
/* The toolkit no longer supports the Print Dialog (for embedders) */
#define NS_ERROR_GFX_NO_PRINTDIALOG_IN_TOOLKIT \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+28)
/* The was wasn't any Print Prompt service registered (this shouldn't happen) */
#define NS_ERROR_GFX_NO_PRINTROMPTSERVICE \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+29)
/* Xprint module specific: No Xprint servers found */
#define NS_ERROR_GFX_PRINTER_XPRINT_NO_XPRINT_SERVERS_FOUND \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+30)
/* requested plex mode not supported by printer */
#define NS_ERROR_GFX_PRINTER_PLEX_NOT_SUPPORTED \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+31)
/* The document is still being loaded */
#define NS_ERROR_GFX_PRINTER_DOC_IS_BUSY \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+32)
/* Printing is not implemented */
#define NS_ERROR_GFX_PRINTING_NOT_IMPLEMENTED \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+33)
/* Cannot load the matching print module */
#define NS_ERROR_GFX_COULD_NOT_LOAD_PRINT_MODULE \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+34)
/* requested resolution/quality mode not supported by printer */
#define NS_ERROR_GFX_PRINTER_RESOLUTION_NOT_SUPPORTED \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+35)
/**
* Conts need for Print Preview
*/
#ifdef NS_PRINT_PREVIEW
const PRUint8 kUseAltDCFor_NONE = 0x00; // Do not use the AltDC for anything
const PRUint8 kUseAltDCFor_FONTMETRICS = 0x01; // Use it for only getting the font metrics
const PRUint8 kUseAltDCFor_CREATERC_REFLOW = 0x02; // Use when creating RenderingContexts for Reflow
const PRUint8 kUseAltDCFor_CREATERC_PAINT = 0x04; // Use when creating RenderingContexts for Painting
const PRUint8 kUseAltDCFor_SURFACE_DIM = 0x08; // Use it for getting the Surface Dimensions
#endif
#define NS_IDEVICE_CONTEXT_IID \
{ 0x5931c580, 0xb917, 0x11d1, \
{ 0xa8, 0x24, 0x00, 0x40, 0x95, 0x9a, 0x28, 0xc9 } }
//a cross platform way of specifying a native palette handle
typedef void * nsPalette;
//structure used to return information about a device's palette capabilities
struct nsPaletteInfo {
PRPackedBool isPaletteDevice;
PRUint16 sizePalette; // number of entries in the palette
PRUint16 numReserved; // number of reserved palette entries
nsPalette palette; // native palette handle
};
typedef enum {
eSystemFont_Caption, // css2
eSystemFont_Icon,
eSystemFont_Menu,
eSystemFont_MessageBox,
eSystemFont_SmallCaption,
eSystemFont_StatusBar,
eSystemFont_Window, // css3
eSystemFont_Document,
eSystemFont_Workspace,
eSystemFont_Desktop,
eSystemFont_Info,
eSystemFont_Dialog,
eSystemFont_Button,
eSystemFont_PullDownMenu,
eSystemFont_List,
eSystemFont_Field,
eSystemFont_Tooltips, // moz
eSystemFont_Widget
} nsSystemFontID;
class nsIDeviceContext : public nsISupports
{
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IDEVICE_CONTEXT_IID)
/**
* Initialize the device context from a widget
* @param aWidget a native widget to initialize the device context from
* @return error status
*/
NS_IMETHOD Init(nsNativeWidget aWidget) = 0;
/**
* Create a rendering context and initialize it from an nsIView
* @param aView view to initialize context from
* @param aContext out parameter for new rendering context
* @return error status
*/
NS_IMETHOD CreateRenderingContext(nsIView *aView, nsIRenderingContext *&aContext) = 0;
/**
* Create a rendering context and initialize it from an nsIDrawingSurface*
* @param nsIDrawingSurface* widget to initialize context from
* @param aContext out parameter for new rendering context
* @return error status
*/
NS_IMETHOD CreateRenderingContext(nsIDrawingSurface* aSurface, nsIRenderingContext *&aContext) = 0;
/**
* Create a rendering context and initialize it from an nsIWidget
* @param aWidget widget to initialize context from
* @param aContext out parameter for new rendering context
* @return error status
*/
NS_IMETHOD CreateRenderingContext(nsIWidget *aWidget, nsIRenderingContext *&aContext) = 0;
/**
* Create a rendering context and initialize it. This API should *only* be called
* on device contexts whose SupportsNativeWidgets() method return PR_FALSE.
* @param aContext out parameter for new rendering context
* @return error status
*/
NS_IMETHOD CreateRenderingContext(nsIRenderingContext *&aContext) = 0;
/**
* Create an uninitalised rendering context.
* @param aContext out parameter for new rendering context
* @return error status
*/
NS_IMETHOD CreateRenderingContextInstance(nsIRenderingContext *&aContext) = 0;
/**
* Query the device to see if it supports native widgets. If not, then
* nsIWidget->Create() calls should be avoided.
* @param aSupportsWidgets out paramater. If PR_TRUE, then native widgets
* can be created.
* @return error status
*/
NS_IMETHOD SupportsNativeWidgets(PRBool &aSupportsWidgets) = 0;
/**
* Obtain the size of a device unit relative to a Twip. A twip is 1/20 of
* a point (which is 1/72 of an inch).
* @return conversion value
*/
float DevUnitsToTwips() const { return mPixelsToTwips; }
/**
* Obtain the size of a Twip relative to a device unit.
* @return conversion value
*/
float TwipsToDevUnits() const { return mTwipsToPixels; }
/**
* Set the scale factor to convert units used by the application
* to device units. Typically, an application will query the device
* for twips to device units scale and then set the scale
* to convert from whatever unit the application wants to use
* to device units. From that point on, all other parts of the
* app can use the Get* methods below to figure out how
* to convert device units <-> app units.
* @param aAppUnits scale value to convert from application defined
* units to device units.
*/
void SetAppUnitsToDevUnits(float aAppUnits)
{
mAppUnitsToDevUnits = aAppUnits;
}
/**
* Set the scale factor to convert device units to units
* used by the application. This should generally be
* 1.0f / the value passed into SetAppUnitsToDevUnits().
* @param aDevUnits scale value to convert from device units to
* application defined units
*/
void SetDevUnitsToAppUnits(float aDevUnits)
{
mDevUnitsToAppUnits = aDevUnits;
}
/**
* Get the scale factor to convert from application defined
* units to device units.
* @param aAppUnits scale value
*/
float AppUnitsToDevUnits() const { return mAppUnitsToDevUnits; }
/**
* Get the scale factor to convert from device units to
* application defined units.
* @param aDevUnits out paramater for scale value
* @return error status
*/
float DevUnitsToAppUnits() const { return mDevUnitsToAppUnits; }
/**
* Get the value used to scale a "standard" pixel to a pixel
* of the same physical size for this device. a standard pixel
* is defined as a pixel on display 0. this is used to make
* sure that entities defined in pixel dimensions maintain a
* constant relative size when displayed from one output
* device to another.
* @param aScale out parameter for scale value
* @return error status
*/
NS_IMETHOD GetCanonicalPixelScale(float &aScale) const = 0;
/**
* Get the value used to scale a "standard" pixel to a pixel
* of the same physical size for this device. a standard pixel
* is defined as a pixel on display 0. this is used to make
* sure that entities defined in pixel dimensions maintain a
* constant relative size when displayed from one output
* device to another.
* @param aScale in parameter for scale value
* @return error status
*/
NS_IMETHOD SetCanonicalPixelScale(float aScale) = 0;
/**
* Get the width of a vertical scroll bar and the height
* of a horizontal scrollbar in application units.
* @param aWidth out parameter for width
* @param aHeight out parameter for height
* @return error status
*/
NS_IMETHOD GetScrollBarDimensions(float &aWidth, float &aHeight) const = 0;
/**
* Fill in an nsFont based on the ID of a system font. This function
* may or may not fill in the size, so the size should be set to a
* reasonable default before calling.
*
* @param aID The system font ID.
* @param aInfo The font structure to be filled in.
* @return error status
*/
NS_IMETHOD GetSystemFont(nsSystemFontID aID, nsFont *aFont) const = 0;
/**
* Get the nsIFontMetrics that describe the properties of
* an nsFont.
* @param aFont font description to obtain metrics for
* @param aLangGroup the language group of the document
* @param aMetrics out parameter for font metrics
* @return error status
*/
NS_IMETHOD GetMetricsFor(const nsFont& aFont, nsIAtom* aLangGroup,
nsIFontMetrics*& aMetrics) = 0;
/**
* Get the nsIFontMetrics that describe the properties of
* an nsFont.
* @param aFont font description to obtain metrics for
* @param aMetrics out parameter for font metrics
* @return error status
*/
NS_IMETHOD GetMetricsFor(const nsFont& aFont, nsIFontMetrics*& aMetrics) = 0;
//get and set the document zoom value used for display-time
//scaling. default is 1.0 (no zoom)
NS_IMETHOD SetZoom(float aZoom) = 0;
NS_IMETHOD GetZoom(float &aZoom) const = 0;
//get and set the text zoom value used for display-time scaling.
//default is 1.0 (no zoom). The device context doesn't do anything
//with this value. It's merely a convenient place to store it.
NS_IMETHOD SetTextZoom(float aTextZoom) = 0;
NS_IMETHOD GetTextZoom(float &aTextZoom) const = 0;
/**
* Check to see if a particular named font exists.
* @param aFontName character string of font face name
* @return NS_OK if font is available, else font is unavailable
*/
NS_IMETHOD CheckFontExistence(const nsString& aFaceName) = 0;
NS_IMETHOD FirstExistingFont(const nsFont& aFont, nsString& aFaceName) = 0;
NS_IMETHOD GetLocalFontName(const nsString& aFaceName, nsString& aLocalName,
PRBool& aAliased) = 0;
/**
* Notification when a font metrics instance created for this device is
* about to be deleted
*/
NS_IMETHOD FontMetricsDeleted(const nsIFontMetrics* aFontMetrics) = 0;
/**
* Attempt to free up resoruces by flushing out any fonts no longer
* referenced by anything other than the font cache itself.
* @return error status
*/
NS_IMETHOD FlushFontCache(void) = 0;
/**
* Return the bit depth of the device.
*/
NS_IMETHOD GetDepth(PRUint32& aDepth) = 0;
/**
* Returns information about the device's palette capabilities.
*/
NS_IMETHOD GetPaletteInfo(nsPaletteInfo& aPaletteInfo) = 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
protected:
float mTwipsToPixels;
float mPixelsToTwips;
float mAppUnitsToDevUnits;
float mDevUnitsToAppUnits;
};
#endif /* nsIDeviceContext_h___ */
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