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ImfTiledOutputFile.h

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
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// modification, are permitted provided that the following conditions are
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// *       Redistributions in binary form must reproduce the above
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// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
// 
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#ifndef INCLUDED_IMF_TILED_OUTPUT_FILE_H
#define INCLUDED_IMF_TILED_OUTPUT_FILE_H

//-----------------------------------------------------------------------------
//
//    class TiledOutputFile
//
//-----------------------------------------------------------------------------

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

namespace Imf {

class TiledInputFile;
class InputFile;
struct PreviewRgba;


00057 class TiledOutputFile
{
  public:

    //-------------------------------------------------------------------
    // A constructor that opens the file with the specified name, and
    // writes the file header.  The file header is also copied into the
    // TiledOutputFile object, and can later be accessed via the header()
    // method.
    //
    // Destroying TiledOutputFile constructed with this constructor
    // automatically closes the corresponding files.
    //
    // The header must contain a TileDescriptionAttribute called "tiles".
    //
    // The x and y subsampling factors for all image channels must be 1;
    // subsampling is not supported.
    //
    // Tiles can be written to the file in arbitrary order.  The line
    // order attribute can be used to cause be sorted in the file.
    // When the file is read later, reading the tiles in the same order
    // as they are in the file tends to be significantly faster than
    // reading the tiles in random order (see writeTile, below).
    //-------------------------------------------------------------------
    
    TiledOutputFile (const char fileName[], const Header &header);


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

    TiledOutputFile (OStream &os, const Header &header);


    //-----------------------------------------------------
    // Destructor
    //
    // Destroying a TiledOutputFile object before all tiles
    // have been written results in an incomplete file.
    //-----------------------------------------------------
    
    virtual ~TiledOutputFile ();


    //------------------------
    // Access to the file name
    //------------------------
    
    const char *  fileName () const;


    //--------------------------
    // Access to the file header
    //--------------------------
    
    const Header &      header () const;


    //-------------------------------------------------------
    // Set the current frame buffer -- copies the FrameBuffer
    // object into the TiledOutputFile object.
    //
    // The current frame buffer is the source of the pixel
    // data written to the file.  The current frame buffer
    // must be set at least once before writeTile() is
    // called.  The current frame buffer can be changed
    // after each call to writeTile().
    //-------------------------------------------------------
    
    void          setFrameBuffer (const FrameBuffer &frameBuffer);


    //-----------------------------------
    // Access to the current frame buffer
    //-----------------------------------
    
    const FrameBuffer & frameBuffer () 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;

    //------------------------------------------------------------------
    // Write pixel data:
    //
    // writeTile(dx, dy, lx, ly) writes the tile with tile
    // coordinates (dx, dy), and level number (lx, ly) to
    // the file.
    //
    //   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]
    //
    // writeTile(dx, dy, level) is a convenience function
    // used for ONE_LEVEL and MIPMAP_LEVEL files.  It calls
    // writeTile(dx, dy, level, level).
    //
    // Pixels that are outside the pixel coordinate range for the tile's
    // level, are never accessed by writeTile().
    //
    // Each tile in the file must be written exactly once.
    //
    // The file's line order attribute determines the order of the tiles
    // in the file:
    //
    //       INCREASING_Y     In the file, the tiles for each level are stored
    //                  in a contiguous block.  The levels are ordered
    //                  like this:
    //
    //                      (0, 0)   (1, 0)   ... (nx-1, 0) 
    //                      (0, 1)   (1, 1)   ... (nx-1, 1) 
    //                       ...
    //                      (0,ny-1) (1,ny-1) ... (nx-1,ny-1) 
    //
    //                  where nx = numXLevels(), and ny = numYLevels().
    //                  In an individual level, (lx, ly), the tiles
    //                  are stored in the following order:
    //
    //                      (0, 0)   (1, 0)   ... (tx-1, 0)
    //                      (0, 1)   (1, 1)   ... (tx-1, 1)
    //                       ...
    //                      (0,ty-1) (1,ty-1) ... (tx-1,ty-1)
    //
    //                  where tx = numXTiles(lx),
    //                  and   ty = numYTiles(ly).
    //
    //       DECREASING_Y   As for INCREASING_Y, the tiles for each level
    //                  are stored in a contiguous block.  The levels
    //                  are ordered the same way as for INCREASING_Y,
    //                  but within an individual level, the tiles
    //                  are stored in this order:
    //
    //                      (0,ty-1) (1,ty-1) ... (tx-1,ty-1)
    //                       ...
    //                      (0, 1)   (1, 1)   ... (tx-1, 1)
    //                      (0, 0)   (1, 0)   ... (tx-1, 0)
    //
    //
    //       RANDOM_Y   The order of the calls to writeTile() determines
    //                  the order of the tiles in the file.
    //
    //------------------------------------------------------------------

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


    //------------------------------------------------------------------
    // Shortcut to copy all pixels from a TiledInputFile into this file,
    // without uncompressing and then recompressing the pixel data.
    // This file's header must be compatible with the TiledInputFile's
    // header:  The two header's "dataWindow", "compression",
    // "lineOrder", "channels", and "tiles" attributes must be the same.
    //------------------------------------------------------------------
    
    void          copyPixels (TiledInputFile &in);
    

    //------------------------------------------------------------------
    // Shortcut to copy all pixels from an InputFile into this file,
    // without uncompressing and then recompressing the pixel data.
    // This file's header must be compatible with the InputFile's
    // header:  The two header's "dataWindow", "compression",
    // "lineOrder", "channels", and "tiles" attributes must be the same.
    //
    // To use this function, the InputFile must be tiled.
    //------------------------------------------------------------------
    
    void          copyPixels (InputFile &in);


    //--------------------------------------------------------------
    // Updating the preview image:
    //
    // updatePreviewImage() supplies a new set of pixels for the
    // preview image attribute in the file's header.  If the header
    // does not contain a preview image, updatePreviewImage() throws
    // an Iex::LogicExc.
    //
    // Note: updatePreviewImage() is necessary because images are
    // often stored in a file incrementally, a few tiles at a time,
    // while the image is being generated.  Since the preview image
    // is an attribute in the file's header, it gets stored in the
    // file as soon as the file is opened, but we may not know what
    // the preview image should look like until we have written the
    // last tile of the main image.
    //
    //--------------------------------------------------------------

    void          updatePreviewImage (const PreviewRgba newPixels[]);


    struct Data;

  private:

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

    void          initialize (const Header &header);

    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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