gecko-dev/gfx/thebes/gfxImageSurface.h

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** 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 Oracle Corporation code.
*
* The Initial Developer of the Original Code is Oracle Corporation.
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Stuart Parmenter <pavlov@pavlov.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 GFX_IMAGESURFACE_H
#define GFX_IMAGESURFACE_H
#include "gfxASurface.h"
#include "gfxPoint.h"
// ARGB -- raw buffer.. wont be changed.. good for storing data.
class gfxSubimageSurface;
/**
* A raw image buffer. The format can be set in the constructor. Its main
* purpose is for storing read-only images and using it as a source surface,
* but it can also be drawn to.
*/
class THEBES_API gfxImageSurface : public gfxASurface {
public:
/**
* Construct an image surface around an existing buffer of image data.
* @param aData A buffer containing the image data
* @param aSize The size of the buffer
* @param aStride The stride of the buffer
* @param format Format of the data
*
* @see gfxImageFormat
*/
gfxImageSurface(unsigned char *aData, const gfxIntSize& aSize,
long aStride, gfxImageFormat aFormat);
/**
* Construct an image surface.
* @param aSize The size of the buffer
* @param format Format of the data
*
* @see gfxImageFormat
*/
gfxImageSurface(const gfxIntSize& size, gfxImageFormat format);
gfxImageSurface(cairo_surface_t *csurf);
virtual ~gfxImageSurface();
// ImageSurface methods
gfxImageFormat Format() const { return mFormat; }
virtual const gfxIntSize GetSize() const { return mSize; }
PRInt32 Width() const { return mSize.width; }
PRInt32 Height() const { return mSize.height; }
/**
* Distance in bytes between the start of a line and the start of the
* next line.
*/
PRInt32 Stride() const { return mStride; }
/**
* Returns a pointer for the image data. Users of this function can
* write to it, but must not attempt to free the buffer.
*/
unsigned char* Data() const { return mData; } // delete this data under us and die.
/**
* Returns the total size of the image data.
*/
PRInt32 GetDataSize() const { return mStride*mSize.height; }
/* Fast copy from another image surface; returns TRUE if successful, FALSE otherwise */
PRBool CopyFrom (gfxImageSurface *other);
/* return new Subimage with pointing to original image starting from aRect.pos
* and size of aRect.size. New subimage keeping current image reference
*/
already_AddRefed<gfxSubimageSurface> GetSubimage(const gfxRect& aRect);
virtual already_AddRefed<gfxImageSurface> GetAsImageSurface();
/** See gfxASurface.h. */
NS_OVERRIDE
virtual void MovePixels(const nsIntRect& aSourceRect,
const nsIntPoint& aDestTopLeft);
protected:
gfxImageSurface();
void InitWithData(unsigned char *aData, const gfxIntSize& aSize,
long aStride, gfxImageFormat aFormat);
void InitFromSurface(cairo_surface_t *csurf);
long ComputeStride() const { return ComputeStride(mSize, mFormat); }
static long ComputeStride(const gfxIntSize&, gfxImageFormat);
gfxIntSize mSize;
PRBool mOwnsData;
unsigned char *mData;
gfxImageFormat mFormat;
long mStride;
};
class THEBES_API gfxSubimageSurface : public gfxImageSurface {
protected:
friend class gfxImageSurface;
gfxSubimageSurface(gfxImageSurface* aParent,
unsigned char* aData,
const gfxIntSize& aSize);
private:
nsRefPtr<gfxImageSurface> mParent;
};
#endif /* GFX_IMAGESURFACE_H */