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gecko-dev/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"
// XXX we need only gfxTypes.h, but we cannot include it directly.
#include "gfxPoint.h"
class nsIView;
class nsIFontMetrics;
class nsIWidget;
class nsIDeviceContextSpec;
class nsIAtom;
struct nsFont;
//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)
/* 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+24)
/* 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+25)
/* 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+26)
/* 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+27)
/* 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+28)
/* 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+29)
/* 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+30)
/* Printing is not implemented */
#define NS_ERROR_GFX_PRINTING_NOT_IMPLEMENTED \
NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GFX,NS_ERROR_GFX_PRINTER_BASE+31)
/* 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+32)
/* 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+33)
/**
* 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
// 4dd372b6-ef19-4995-a7ac-ba3efd3f656f
#define NS_IDEVICE_CONTEXT_IID \
{ 0x4dd372b6, 0xef19, 0x4995, \
{ 0xa7, 0xac, 0xba, 0x3e, 0xfd, 0x3f, 0x65, 0x6f } }
//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_DECLARE_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;
/**
* Initialize the device context from a device context spec
* @param aDevSpec the specification of the printng device (platform-specific)
* @return error status
*/
NS_IMETHOD InitForPrinting(nsIDeviceContextSpec* aDevSpec) = 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 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;
/**
* We are in the process of creating the native widget for aWidget.
* Do any device-specific processing required to initialize the
* native widget for this device. A pointer to some platform-specific data is
* returned in aOut.
*
* GTK2 calls this to get the required visual for the window.
*/
NS_IMETHOD PrepareNativeWidget(nsIWidget* aWidget, void** aOut) = 0;
/**
* Gets the number of app units in one CSS pixel; this number is global,
* not unique to each device context.
*/
static PRInt32 AppUnitsPerCSSPixel() { return 60; }
/**
* Convert app units to CSS pixels which is used in gfx/thebes.
*/
static gfxFloat AppUnitsToGfxCSSPixels(nscoord aAppUnits)
{ return gfxFloat(aAppUnits) / AppUnitsPerCSSPixel(); }
/**
* Gets the number of app units in one device pixel; this number is usually
* a factor of AppUnitsPerCSSPixel(), although that is not guaranteed.
*/
PRInt32 AppUnitsPerDevPixel() const { return mAppUnitsPerDevPixel; }
/**
* Convert app units to device pixels which is used in gfx/thebes.
*/
gfxFloat AppUnitsToGfxUnits(nscoord aAppUnits) const
{ return gfxFloat(aAppUnits) / AppUnitsPerDevPixel(); }
/**
* Gets the number of app units in one inch; this is the device's DPI
* times AppUnitsPerDevPixel().
*/
PRInt32 AppUnitsPerInch() const { return mAppUnitsPerInch; }
/**
* 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;
/**
* 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(nscoord &aWidth, nscoord &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;
/**
* 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;
/**
* Clear cached system fonts (refresh from theme when
* requested). This method is effectively static,
* and can be called on a new DeviceContext instance
* without any initialization. Only really used by
* Gtk native theme stuff.
*/
NS_IMETHOD ClearCachedSystemFonts() = 0;
/**
* Check to see if the DPI has changed
* @return whether there was actually a change in the DPI
* (whether AppUnitsPerDevPixel() or AppUnitsPerInch() changed)
*/
virtual PRBool CheckDPIChange() = 0;
/**
* Set the pixel scaling factor: all lengths are multiplied by this factor
* when we convert them to device pixels. Returns whether the ratio of
* app units to dev pixels changed because of the scale factor.
*/
virtual PRBool SetPixelScale(float aScale) = 0;
/**
* Get the pixel scaling factor; defaults to 1.0, but can be changed with
* SetPixelScale.
*/
float GetPixelScale() const { return mPixelScale; }
/**
* Get the unscaled ratio of app units to dev pixels; useful if something
* needs to be converted from to unscaled pixels
*/
PRInt32 UnscaledAppUnitsPerDevPixel() const { return mAppUnitsPerDevNotScaledPixel; }
protected:
PRInt32 mAppUnitsPerDevPixel;
PRInt32 mAppUnitsPerInch;
PRInt32 mAppUnitsPerDevNotScaledPixel;
float mPixelScale;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsIDeviceContext, NS_IDEVICE_CONTEXT_IID)
#endif /* nsIDeviceContext_h___ */
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