зеркало из https://github.com/mozilla/gecko-dev.git
169 строки
6.4 KiB
C++
169 строки
6.4 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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*
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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 nsIDrawingSurface_h___
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#define nsIDrawingSurface_h___
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#include "nscore.h"
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#include "nsISupports.h"
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// a memory area that can be rendered to
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typedef struct
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{
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PRUint32 mRedZeroMask; //red color mask in zero position
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PRUint32 mGreenZeroMask; //green color mask in zero position
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PRUint32 mBlueZeroMask; //blue color mask in zero position
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PRUint32 mAlphaZeroMask; //alpha data mask in zero position
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PRUint32 mRedMask; //red color mask
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PRUint32 mGreenMask; //green color mask
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PRUint32 mBlueMask; //blue color mask
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PRUint32 mAlphaMask; //alpha data mask
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PRUint8 mRedCount; //number of red color bits
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PRUint8 mGreenCount; //number of green color bits
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PRUint8 mBlueCount; //number of blue color bits
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PRUint8 mAlphaCount; //number of alpha data bits
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PRUint8 mRedShift; //number to shift value into red position
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PRUint8 mGreenShift; //number to shift value into green position
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PRUint8 mBlueShift; //number to shift value into blue position
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PRUint8 mAlphaShift; //number to shift value into alpha position
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} nsPixelFormat;
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#define RASWIDTH(width, bpp) ((((width) * (bpp) + 31) >> 5) << 2)
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#define NS_IDRAWING_SURFACE_IID \
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{ 0x61cc77e0, 0xcaac, 0x11d2, \
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{ 0xa8, 0x49, 0x00, 0x40, 0x95, 0x9a, 0x28, 0xc9 } }
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class nsIDrawingSurface : public nsISupports
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{
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public:
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NS_DEFINE_STATIC_IID_ACCESSOR(NS_IDRAWING_SURFACE_IID)
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/**
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* Lock a rect of a drawing surface and return a
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* pointer to the upper left hand corner of the
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* bitmap.
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* @param aX x position of subrect of bitmap
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* @param aY y position of subrect of bitmap
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* @param aWidth width of subrect of bitmap
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* @param aHeight height of subrect of bitmap
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* @param aBits out parameter for upper left hand
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* corner of bitmap
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* @param aStride out parameter for number of bytes
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* to add to aBits to go from scanline to scanline
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* @param aWidthBytes out parameter for number of
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* bytes per line in aBits to process aWidth pixels
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* @return error status
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*
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**/
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NS_IMETHOD Lock(PRInt32 aX, PRInt32 aY, PRUint32 aWidth, PRUint32 aHeight,
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void **aBits, PRInt32 *aStride, PRInt32 *aWidthBytes,
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PRUint32 aFlags) = 0;
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/**
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* Unlock a rect of a drawing surface. must be preceded
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* by a call to Lock(). Lock()/Unlock() pairs do not nest.
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* @return error status
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*
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**/
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NS_IMETHOD Unlock(void) = 0;
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/**
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* Get the dimensions of a drawing surface
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* @param aWidth out parameter for width of drawing surface
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* @param aHeight out parameter for height of drawing surface
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* @return error status
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*
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**/
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NS_IMETHOD GetDimensions(PRUint32 *aWidth, PRUint32 *aHeight) = 0;
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/**
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* Get the offscreen status of the drawing surface
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* @param aOffscreen out parameter for offscreen status of
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* drawing surface. if PR_TRUE, then modifying the
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* drawing surface does not immediately reflect the
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* changes on the output device
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* @return error status
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*
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**/
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NS_IMETHOD IsOffscreen(PRBool *aOffScreen) = 0;
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/**
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* Get the pixel addressability status of the drawing surface
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* @param aAddressable out parameter for pixel addressability
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* status of drawing surface. if PR_TRUE, then the
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* drawing surface is optimized for pixel addressability
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* (i.e. the Lock() method has very low overhead). All
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* drawing surfaces support Lock()ing, but doing so on
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* drawing surfaces that do not return PR_TRUE here may
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* impose significant overhead.
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* @return error status
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*
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**/
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NS_IMETHOD IsPixelAddressable(PRBool *aAddressable) = 0;
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/**
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* Get the pixel format of a drawing surface
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* @param aOffscreen out parameter filled in with pixel
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* format information.
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* @return error status
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*
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**/
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NS_IMETHOD GetPixelFormat(nsPixelFormat *aFormat) = 0;
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};
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//when creating a drawing surface, you can use this
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//to tell the drawing surface that you anticipate
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//the need to get to the actual bits of the drawing
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//surface at some point during it's lifetime. typically
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//used when creating bitmaps to be operated on by the
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//nsIBlender implementations.
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#define NS_CREATEDRAWINGSURFACE_FOR_PIXEL_ACCESS 0x0001
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//flag to say that this drawing surface is shortlived,
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//which may affect how the OS allocates it. Used for
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//tiling, grouting etc.
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#define NS_CREATEDRAWINGSURFACE_SHORTLIVED 0x0002
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//when locking a drawing surface, use these flags to
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//control how the data in the surface should be accessed
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#define NS_LOCK_SURFACE_READ_ONLY 0x0001
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#define NS_LOCK_SURFACE_WRITE_ONLY 0x0002
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#endif // nsIDrawingSurface_h___
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