imfheader.h

对gif

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, 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_HEADER_H
#define INCLUDED_IMF_HEADER_H

//-----------------------------------------------------------------------------
//
//	class Header
//
//-----------------------------------------------------------------------------

#include <ImfLineOrder.h>
#include <ImfCompression.h>
#include <ImfName.h>
#include <ImfTileDescription.h>
#include <ImfInt64.h>
#include "ImathVec.h"
#include "ImathBox.h"
#include "IexBaseExc.h"
#include <map>
#include <iosfwd>

namespace Imf {


class Attribute;
class ChannelList;
class IStream;
class OStream;
class PreviewImage;


class Header
{
  public:
    
    //----------------------------------------------------------------
    // Default constructor -- the display window and the data window
    // are both set to Box2i (V2i (0, 0), V2i (width-1, height-1).
    //----------------------------------------------------------------

    Header (int width = 64,
	    int height = 64,
	    float pixelAspectRatio = 1,
	    const Imath::V2f &screenWindowCenter = Imath::V2f (0, 0),
	    float screenWindowWidth = 1,
	    LineOrder lineOrder = INCREASING_Y,
	    Compression = ZIP_COMPRESSION);


    //--------------------------------------------------------------------
    // Constructor -- the data window is specified explicitly; the display
    // window is set to Box2i (V2i (0, 0), V2i (width-1, height-1).
    //--------------------------------------------------------------------

    Header (int width,
	    int height,
	    const Imath::Box2i &dataWindow,
	    float pixelAspectRatio = 1,
	    const Imath::V2f &screenWindowCenter = Imath::V2f (0, 0),
	    float screenWindowWidth = 1,
	    LineOrder lineOrder = INCREASING_Y,
	    Compression = ZIP_COMPRESSION);


    //----------------------------------------------------------
    // Constructor -- the display window and the data window are
    // both specified explicitly.
    //----------------------------------------------------------

    Header (const Imath::Box2i &displayWindow,
	    const Imath::Box2i &dataWindow,
	    float pixelAspectRatio = 1,
	    const Imath::V2f &screenWindowCenter = Imath::V2f (0, 0),
	    float screenWindowWidth = 1,
	    LineOrder lineOrder = INCREASING_Y,
	    Compression = ZIP_COMPRESSION);


    //-----------------
    // Copy constructor
    //-----------------

    Header (const Header &other);


    //-----------
    // Destructor
    //-----------

    ~Header ();


    //-----------
    // Assignment
    //-----------

    Header &			operator = (const Header &other);


    //---------------------------------------------------------------
    // Add an attribute:
    //
    // insert(n,attr)	If no attribute with name n exists, a new
    //			attribute with name n, and the same type as
    //			attr, is added, and the value of attr is
    //			copied into the new attribute.
    //
    //			If an attribute with name n exists, and its
    //			type is the same as attr, the value of attr
    //			is copied into this attribute.
    //
    //			If an attribute with name n exists, and its
    //			type is different from attr, an Iex::TypeExc
    //			is thrown.
    //
    //---------------------------------------------------------------

    void			insert (const char name[],
				        const Attribute &attribute);

    //------------------------------------------------------------------
    // Access to existing attributes:
    //
    // [n]			Returns a reference to the attribute
    //				with name n.  If no attribute with
    //				name n exists, an Iex::ArgExc is thrown.
    //
    // typedAttribute<T>(n)	Returns a reference to the attribute
    //				with name n and type T.  If no attribute
    //				with name n exists, an Iex::ArgExc is
    //				thrown.  If an attribute with name n
    //				exists, but its type is not T, an
    //				Iex::TypeExc is thrown.
    //
    // findTypedAttribute<T>(n)	Returns a pointer to the attribute with
    //				name n and type T, or 0 if no attribute
    //				with name n and type T exists.
    //
    //------------------------------------------------------------------

    Attribute &			operator [] (const char name[]);
    const Attribute &		operator [] (const char name[]) const;

    template <class T> T&	typedAttribute (const char name[]);
    template <class T> const T&	typedAttribute (const char name[]) const;

    template <class T> T*	findTypedAttribute (const char name[]);
    template <class T> const T*	findTypedAttribute (const char name[]) const;


    //---------------------------------------------
    // Iterator-style access to existing attributes
    //---------------------------------------------

    typedef std::map <Name, Attribute *> AttributeMap;

    class Iterator;
    class ConstIterator;

    Iterator			begin ();
    ConstIterator		begin () const;
    Iterator			end ();
    ConstIterator		end () const;
    Iterator			find (const char name[]);
    ConstIterator		find (const char name[]) const;


    //--------------------------------
    // Access to predefined attributes
    //--------------------------------

    Imath::Box2i &		displayWindow ();
    const Imath::Box2i &	displayWindow () const;

    Imath::Box2i &		dataWindow ();
    const Imath::Box2i &	dataWindow () const;

    float &			pixelAspectRatio ();
    const float &		pixelAspectRatio () const;

    Imath::V2f &		screenWindowCenter ();
    const Imath::V2f &		screenWindowCenter () const;

    float &			screenWindowWidth ();
    const float &		screenWindowWidth () const;

    ChannelList &		channels ();
    const ChannelList &		channels () const;

    LineOrder &			lineOrder ();
    const LineOrder &		lineOrder () const;

    Compression &		compression ();
    const Compression &		compression () const;


    //----------------------------------------------------------------------
    // Tile Description:
    //
    // The tile description is a TileDescriptionAttribute whose name
    // is "tiles".  The "tiles" attribute must be present in any tiled
    // image file. When present, it describes various properties of the
    // tiles that make up the file.
    //
    // Convenience functions:
    //
    // setTileDescription(td)
    //     calls insert ("tiles", TileDescriptionAttribute (td))
    //
    // tileDescription()
    //     returns typedAttribute<TileDescriptionAttribute>("tiles").value()
    //
    // hasTileDescription()
    //     return findTypedAttribute<TileDescriptionAttribute>("tiles") != 0
    //
    //----------------------------------------------------------------------

    void			setTileDescription (const TileDescription & td);

    TileDescription &		tileDescription ();
    const TileDescription &	tileDescription () const;

    bool			hasTileDescription() const;


    //----------------------------------------------------------------------
    // Preview image:
    //
    // The preview image is a PreviewImageAttribute whose name is "preview".
    // This attribute is special -- while an image file is being written,
    // the pixels of the preview image can be changed repeatedly by calling
    // OutputFile::updatePreviewImage().
    //
    // Convenience functions:
    //
    // setPreviewImage(p)
    //     calls insert ("preview", PreviewImageAttribute (p))
    //
    // previewImage()
    //     returns typedAttribute<PreviewImageAttribute>("preview").value()
    //
    // hasPreviewImage()
    //     return findTypedAttribute<PreviewImageAttribute>("preview") != 0
    //
    //----------------------------------------------------------------------

    void			setPreviewImage (const PreviewImage &p);

    PreviewImage &		previewImage ();
    const PreviewImage &	previewImage () const;

    bool			hasPreviewImage () const;