gfx/thebes/public/gfxImageSurface.h
author Robert O'Callahan <robert@ocallahan.org>
Wed, 11 Jun 2008 11:46:32 +1200
changeset 15297 3723b91632d3494d266fa1537a9b53a5b3874939
parent 11244 dc8e83b07445de3eedf611820be8637af8e9f739
child 15751 82a78cd809c455c7ba65c851f0fac1d9311f3a54
permissions -rw-r--r--
Add Width/Height/GetDataSize getters to gfxImageSurface. r=vlad

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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 * 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
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 * Software distributed under the License is distributed on an "AS IS" basis,
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 * License.
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 * The Original Code is Oracle Corporation code.
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 * 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.
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 * Contributor(s):
 *   Stuart Parmenter <pavlov@pavlov.net>
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
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#ifndef GFX_IMAGESURFACE_H
#define GFX_IMAGESURFACE_H

#include "gfxASurface.h"
#include "gfxPoint.h"

// ARGB -- raw buffer.. wont be changed.. good for storing data.

/**
 * 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.
     * @param format Format of the data
     * @param width Width of the surface in pixels
     * @param height Height in pixels
     *
     * @see gfxImageFormat
     *
     * XXX why not unsigned long for the dimensions? And, why not gfxSize?
     */
    gfxImageSurface(const gfxIntSize& size, gfxImageFormat format);
    gfxImageSurface(cairo_surface_t *csurf);

    virtual ~gfxImageSurface();

    // ImageSurface methods
    gfxImageFormat Format() const { return mFormat; }

    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);

private:
    long ComputeStride() const;

    gfxIntSize mSize;
    PRBool mOwnsData;
    unsigned char *mData;
    gfxImageFormat mFormat;
    long mStride;
};

#endif /* GFX_IMAGESURFACE_H */