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ImfTiledInputFile.h

///////////////////////////////////////////////////////////////////////////
//
// 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
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// *       Redistributions of source code must retain the above copyright
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// *       Redistributions in binary form must reproduce the above
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// distribution.
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// 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
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///////////////////////////////////////////////////////////////////////////


#ifndef INCLUDED_IMF_TILED_INPUT_FILE_H
#define INCLUDED_IMF_TILED_INPUT_FILE_H

//-----------------------------------------------------------------------------
//
//    class TiledInputFile
//
//-----------------------------------------------------------------------------

#include <ImfHeader.h>
#include <ImfFrameBuffer.h>
#include "ImathBox.h"
#include <ImfTileDescription.h>
#include <ImfThreading.h>

namespace Imf {


class TiledInputFile
{
  public:

    //--------------------------------------------------------------------
    // A constructor that opens the file with the specified name, and
    // reads the file header.  The constructor throws an Iex::ArgExc
    // exception if the file is not tiled.
    // The numThreads parameter specifies how many worker threads this
    // file will try to keep busy when decompressing individual tiles.
    // Destroying TiledInputFile objects constructed with this constructor
    // automatically closes the corresponding files.
    //--------------------------------------------------------------------

    TiledInputFile (const char fileName[],
                    int numThreads = globalThreadCount ());

    
    // ----------------------------------------------------------
    // A constructor that attaches the new TiledInputFile object
    // to a file that has already been opened.  
    // Destroying TiledInputFile objects constructed with this
    // constructor does not automatically close the corresponding
    // files.
    // ----------------------------------------------------------

    TiledInputFile (IStream &is, int numThreads = globalThreadCount ());


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

    virtual ~TiledInputFile ();


    //------------------------
    // Access to the file name
    //------------------------

    const char *  fileName () const;


    //--------------------------
    // Access to the file header
    //--------------------------

    const Header &      header () const;


    //----------------------------------
    // Access to the file format version
    //----------------------------------

    int                 version () const;


    //-----------------------------------------------------------
    // Set the current frame buffer -- copies the FrameBuffer
    // object into the TiledInputFile object.
    //
    // The current frame buffer is the destination for the pixel
    // data read from the file.  The current frame buffer must be
    // set at least once before readTile() is called.
    // The current frame buffer can be changed after each call
    // to readTile().
    //-----------------------------------------------------------

    void          setFrameBuffer (const FrameBuffer &frameBuffer);


    //-----------------------------------
    // Access to the current frame buffer
    //-----------------------------------

    const FrameBuffer & frameBuffer () const;


    //------------------------------------------------------------
    // Check if the file is complete:
    //
    // isComplete() returns true if all pixels in the data window
    // (in all levels) are present in the input file, or false if
    // any pixels are missing.  (Another program may still be busy
    // writing the file, or file writing may have been aborted
    // prematurely.)
    //------------------------------------------------------------

    bool          isComplete () const;


    //--------------------------------------------------
    // Utility functions:
    //--------------------------------------------------

    //---------------------------------------------------------
    // Multiresolution mode and tile size:
    // The following functions return the xSize, ySize and mode
    // fields of the file header's TileDescriptionAttribute.
    //---------------------------------------------------------

    unsigned int  tileXSize () const;
    unsigned int  tileYSize () const;
    LevelMode           levelMode () const;
    LevelRoundingMode   levelRoundingMode () const;


    //--------------------------------------------------------------------
    // Number of levels:
    //
    // numXLevels() returns the file's number of levels in x direction.
    //
    //      if levelMode() == ONE_LEVEL:
    //      return value is: 1
    //
    //      if levelMode() == MIPMAP_LEVELS:
    //      return value is: rfunc (log (max (w, h)) / log (2)) + 1
    //
    //      if levelMode() == RIPMAP_LEVELS:
    //      return value is: rfunc (log (w) / log (2)) + 1
    //
    //      where
    //          w is the width of the image's data window,  max.x - min.x + 1,
    //          y is the height of the image's data window, max.y - min.y + 1,
    //          and rfunc(x) is either floor(x), or ceil(x), depending on
    //          whether levelRoundingMode() returns ROUND_DOWN or ROUND_UP.
    //
    // numYLevels() returns the file's number of levels in y direction.
    //
    //      if levelMode() == ONE_LEVEL or levelMode() == MIPMAP_LEVELS:
    //      return value is the same as for numXLevels()
    //
    //      if levelMode() == RIPMAP_LEVELS:
    //      return value is: rfunc (log (h) / log (2)) + 1
    //
    //
    // numLevels() is a convenience function for use with
    // MIPMAP_LEVELS files.
    //
    //      if levelMode() == ONE_LEVEL or levelMode() == MIPMAP_LEVELS:
    //      return value is the same as for numXLevels()
    //
    //      if levelMode() == RIPMAP_LEVELS:
    //      an Iex::LogicExc exception is thrown
    //
    // isValidLevel(lx, ly) returns true if the file contains 
    // a level with level number (lx, ly), false if not.
    //
    //--------------------------------------------------------------------

    int                 numLevels () const;
    int                 numXLevels () const;
    int                 numYLevels () const;
    bool          isValidLevel (int lx, int ly) const;


    //----------------------------------------------------------
    // Dimensions of a level:
    //
    // levelWidth(lx) returns the width of a level with level
    // number (lx, *), where * is any number.
    //
    //      return value is:
    //      max (1, rfunc (w / pow (2, lx)))
    //
    //
    // levelHeight(ly) returns the height of a level with level
    // number (*, ly), where * is any number.
    //
    //      return value is:
    //      max (1, rfunc (h / pow (2, ly)))
    //
    //----------------------------------------------------------

    int                 levelWidth  (int lx) const;
    int                 levelHeight (int ly) const;


    //--------------------------------------------------------------
    // Number of tiles:
    //
    // numXTiles(lx) returns the number of tiles in x direction
    // that cover a level with level number (lx, *), where * is
    // any number.
    //
    //      return value is:
    //      (levelWidth(lx) + tileXSize() - 1) / tileXSize()
    //
    //
    // numYTiles(ly) returns the number of tiles in y direction
    // that cover a level with level number (*, ly), where * is
    // any number.
    //
    //      return value is:
    //      (levelHeight(ly) + tileXSize() - 1) / tileXSize()
    //
    //--------------------------------------------------------------

    int                 numXTiles (int lx = 0) const;
    int                 numYTiles (int ly = 0) const;


    //---------------------------------------------------------------
    // Level pixel ranges:
    //
    // dataWindowForLevel(lx, ly) returns a 2-dimensional region of
    // valid pixel coordinates for a level with level number (lx, ly)
    //
    //      return value is a Box2i with min value:
    //      (dataWindow.min.x, dataWindow.min.y)
    //
    //      and max value:
    //      (dataWindow.min.x + levelWidth(lx) - 1,
    //       dataWindow.min.y + levelHeight(ly) - 1)
    //
    // dataWindowForLevel(level) is a convenience function used
    // for ONE_LEVEL and MIPMAP_LEVELS files.  It returns
    // dataWindowForLevel(level, level).
    //
    //---------------------------------------------------------------

    Imath::Box2i  dataWindowForLevel (int l = 0) const;
    Imath::Box2i  dataWindowForLevel (int lx, int ly) const;


    //-------------------------------------------------------------------
    // Tile pixel ranges:
    //
    // dataWindowForTile(dx, dy, lx, ly) returns a 2-dimensional
    // region of valid pixel coordinates for a tile with tile coordinates
    // (dx,dy) and level number (lx, ly).
    //
    //      return value is a Box2i with min value:
    //      (dataWindow.min.x + dx * tileXSize(),
    //       dataWindow.min.y + dy * tileYSize())
    //
    //      and max value:
    //      (dataWindow.min.x + (dx + 1) * tileXSize() - 1,
    //       dataWindow.min.y + (dy + 1) * tileYSize() - 1)
    //
    // dataWindowForTile(dx, dy, level) is a convenience function
    // used for ONE_LEVEL and MIPMAP_LEVELS files.  It returns
    // dataWindowForTile(dx, dy, level, level).
    //
    //-------------------------------------------------------------------

    Imath::Box2i  dataWindowForTile (int dx, int dy, int l = 0) const;

    Imath::Box2i  dataWindowForTile (int dx, int dy,
                                           int lx, int ly) const;

    //------------------------------------------------------------
    // Read pixel data:
    //
    // readTile(dx, dy, lx, ly) reads the tile with tile
    // coordinates (dx, dy), and level number (lx, ly),
    // and stores it in the current frame buffer.
    //
    //   dx must lie in the interval [0, numXTiles(lx)-1]
    //   dy must lie in the interval [0, numYTiles(ly)-1]
    //
    //   lx must lie in the interval [0, numXLevels()-1]
    //   ly must lie in the inverval [0, numYLevels()-1]
    //
    // readTile(dx, dy, level) is a convenience function used
    // for ONE_LEVEL and MIPMAP_LEVELS files.  It calls
    // readTile(dx, dy, level, level).
    //
    // The two readTiles(dx1, dx2, dy1, dy2, ...) functions allow
    // reading multiple tiles at once.  If multi-threading is used
    // the multiple tiles are read concurrently.
    //
    // Pixels that are outside the pixel coordinate range for the
    // tile's level, are never accessed by readTile().
    //
    // Attempting to access a tile that is not present in the file
    // throws an InputExc exception.
    //
    //------------------------------------------------------------

    void          readTile  (int dx, int dy, int l = 0);
    void          readTile  (int dx, int dy, int lx, int ly);

    void          readTiles (int dx1, int dx2, int dy1, int dy2,
                                   int lx, int ly);

    void          readTiles (int dx1, int dx2, int dy1, int dy2,
                                   int l = 0);


    //--------------------------------------------------
    // Read a tile of raw pixel data from the file,
    // without uncompressing it (this function is
    // used to implement TiledOutputFile::copyPixels()).
    //--------------------------------------------------

    void          rawTileData (int &dx, int &dy,
                             int &lx, int &ly,
                             const char *&pixelData,
                             int &pixelDataSize);

    struct Data;

  private:

    friend class InputFile;

    TiledInputFile (const TiledInputFile &);            // not implemented
    TiledInputFile & operator = (const TiledInputFile &); // not implemented

    TiledInputFile (const Header &header, IStream *is, int version,
                    int numThreads);

    void          initialize ();

    bool          isValidTile (int dx, int dy,
                             int lx, int ly) const;

    size_t        bytesPerLineForTile (int dx, int dy,
                                   int lx, int ly) const;

    Data *        _data;
};


} // namespace Imf

#endif

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