//
// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) Contributors to the OpenEXR Project.
//

#ifndef IMFDEEPTILEDOUTPUTPART_H_
#define IMFDEEPTILEDOUTPUTPART_H_

#include "ImfForward.h"

#include "ImfTileDescription.h"

#include <ImathBox.h>

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER

class IMF_EXPORT_TYPE DeepTiledOutputPart
{
public:
    IMF_EXPORT
    DeepTiledOutputPart (MultiPartOutputFile& multiPartFile, int partNumber);

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

    IMF_EXPORT
    const char* fileName () const;

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

    IMF_EXPORT
    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().
    //-------------------------------------------------------

    IMF_EXPORT
    void setFrameBuffer (const DeepFrameBuffer& frameBuffer);

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

    IMF_EXPORT
    const DeepFrameBuffer& 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.
    //---------------------------------------------------------

    IMF_EXPORT
    unsigned int tileXSize () const;
    IMF_EXPORT
    unsigned int tileYSize () const;
    IMF_EXPORT
    LevelMode levelMode () const;
    IMF_EXPORT
    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_NAMESPACE::LogicExc exception is thrown
    //
    // isValidLevel(lx, ly) returns true if the file contains
    // a level with level number (lx, ly), false if not.
    //
    //--------------------------------------------------------------------

    IMF_EXPORT
    int numLevels () const;
    IMF_EXPORT
    int numXLevels () const;
    IMF_EXPORT
    int numYLevels () const;
    IMF_EXPORT
    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)))
    //
    //---------------------------------------------------------

    IMF_EXPORT
    int levelWidth (int lx) const;
    IMF_EXPORT
    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()
    //
    //----------------------------------------------------------

    IMF_EXPORT
    int numXTiles (int lx = 0) const;
    IMF_EXPORT
    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).
    //
    //---------------------------------------------------------

    IMF_EXPORT
    IMATH_NAMESPACE::Box2i dataWindowForLevel (int l = 0) const;
    IMF_EXPORT
    IMATH_NAMESPACE::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).
    //
    //-------------------------------------------------------------------

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

    IMF_EXPORT
    IMATH_NAMESPACE::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 interval [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).
    //
    // The two writeTiles(dx1, dx2, dy1, dy2, ...) functions allow
    // writing multiple tiles at once.  If multi-threading is used
    // multiple tiles are written concurrently.  The tile coordinates,
    // dx1, dx2 and dy1, dy2, specify inclusive ranges of tile
    // coordinates.  It is valid for dx1 < dx2 or dy1 < dy2; the
    // tiles are always written in the order specified by the line
    // order attribute.  Hence, it is not possible to specify an
    // "invalid" or empty tile range.
    //
    // 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.
    //
    //------------------------------------------------------------------

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

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

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

    //------------------------------------------------------------------
    // 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.
    //------------------------------------------------------------------

    IMF_EXPORT
    void copyPixels (DeepTiledInputFile& in);
    IMF_EXPORT
    void copyPixels (DeepTiledInputPart& 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_NAMESPACE::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.
    //
    //--------------------------------------------------------------

    IMF_EXPORT
    void updatePreviewImage (const PreviewRgba newPixels[]);

    //-------------------------------------------------------------
    // Break a tile -- for testing and debugging only:
    //
    // breakTile(dx,dy,lx,ly,p,n,c) introduces an error into the
    // output file by writing n copies of character c, starting
    // p bytes from the beginning of the tile with tile coordinates
    // (dx, dy) and level number (lx, ly).
    //
    // Warning: Calling this function usually results in a broken
    // image file.  The file or parts of it may not be readable,
    // or the file may contain bad data.
    //
    //-------------------------------------------------------------

    IMF_EXPORT
    void
    breakTile (int dx, int dy, int lx, int ly, int offset, int length, char c);

private:
    DeepTiledOutputFile* file;
};

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT

#endif /* IMFDEEPTILEDOUTPUTPART_H_ */
