///////////////////////////////////////////////////////////////////////////

//

// Copyright (c) 2003, Industrial Light & Magic, a division of Lucas

// Digital Ltd. LLC

// 

// All rights reserved.

// 

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// *       Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// *       Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

// *       Neither the name of Industrial Light & Magic nor the names of

// its contributors may be used to endorse or promote products derived

// from this software without specific prior written permission. 

// 

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

///////////////////////////////////////////////////////////////////////////

#ifndef INCLUDED_IMF_PREVIEW_IMAGE_H

#define INCLUDED_IMF_PREVIEW_IMAGE_H

#include "ImfNamespace.h"

#include "ImfExport.h"

//-----------------------------------------------------------------------------

//

//	class PreviewImage -- a usually small, low-dynamic range image,

//	that is intended to be stored in an image file's header.

//

//	struct PreviewRgba -- holds the value of a PreviewImage pixel.

//

//-----------------------------------------------------------------------------

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER

struct IMF_EXPORT PreviewRgba

{

    unsigned char	r;	// Red, green and blue components of

    unsigned char	g;	// the pixel's color; intensity is

    unsigned char	b;	// proportional to pow (x/255, 2.2),

    				// where x is r, g, or b.

    unsigned char	a;	// The pixel's alpha; 0 == transparent,

				// 255 == opaque.

    PreviewRgba (unsigned char r = 0,

		 unsigned char g = 0,

		 unsigned char b = 0,

		 unsigned char a = 255)

	: r(r), g(g), b(b), a(a) {}

};

class IMF_EXPORT PreviewImage

{

  public:

    //--------------------------------------------------------------------

    // Constructor:

    //

    // PreviewImage(w,h,p) constructs a preview image with w by h pixels

    // whose initial values are specified in pixel array p.  The x and y

    // coordinates of the pixels in p go from 0 to w-1, and from 0 to h-1.

    // The pixel with coordinates (x, y) is at address p + y*w + x.

    // Pixel (0, 0) is in the upper left corner of the preview image.

    // If p is zero, the pixels in the preview image are initialized with

    // (r = 0, b = 0, g = 0, a = 255).

    //

    //--------------------------------------------------------------------

     PreviewImage (unsigned int width = 0,

		   unsigned int height = 0,

		   const PreviewRgba pixels[] = 0);

    //-----------------------------------------------------

    // Copy constructor, destructor and assignment operator

    //-----------------------------------------------------

     PreviewImage (const PreviewImage &other);

    ~PreviewImage ();

    PreviewImage &	operator = (const PreviewImage &other);

    //-----------------------------------------------

    // Access to width, height and to the pixel array

    //-----------------------------------------------

    unsigned int	width () const	{return _width;}

    unsigned int	height () const	{return _height;}

    PreviewRgba *	pixels ()	{return _pixels;}

    const PreviewRgba *	pixels () const	{return _pixels;}

    //----------------------------

    // Access to individual pixels

    //----------------------------

    PreviewRgba &	pixel (unsigned int x, unsigned int y)

    					{return _pixels[y * _width + x];}

    const PreviewRgba &	pixel (unsigned int x, unsigned int y) const

    					{return _pixels[y * _width + x];}

  private:

    unsigned int	_width;

    unsigned int	_height;

    PreviewRgba *	_pixels;

};

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT

#endif