382 lines
13 KiB
C
382 lines
13 KiB
C
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///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
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// Digital Ltd. LLC
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Industrial Light & Magic nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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///////////////////////////////////////////////////////////////////////////
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#ifndef INCLUDED_IMF_TILED_INPUT_FILE_H
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#define INCLUDED_IMF_TILED_INPUT_FILE_H
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//-----------------------------------------------------------------------------
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//
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// class TiledInputFile
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//
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//-----------------------------------------------------------------------------
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#include <ImfHeader.h>
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#include <ImfFrameBuffer.h>
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#include "ImathBox.h"
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#include <ImfTileDescription.h>
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#include <ImfThreading.h>
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namespace Imf {
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class TiledInputFile
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{
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public:
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//--------------------------------------------------------------------
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// A constructor that opens the file with the specified name, and
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// reads the file header. The constructor throws an Iex::ArgExc
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// exception if the file is not tiled.
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// The numThreads parameter specifies how many worker threads this
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// file will try to keep busy when decompressing individual tiles.
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// Destroying TiledInputFile objects constructed with this constructor
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// automatically closes the corresponding files.
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//--------------------------------------------------------------------
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TiledInputFile (const char fileName[],
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int numThreads = globalThreadCount ());
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// ----------------------------------------------------------
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// A constructor that attaches the new TiledInputFile object
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// to a file that has already been opened.
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// Destroying TiledInputFile objects constructed with this
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// constructor does not automatically close the corresponding
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// files.
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// ----------------------------------------------------------
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TiledInputFile (IStream &is, int numThreads = globalThreadCount ());
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//-----------
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// Destructor
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//-----------
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virtual ~TiledInputFile ();
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//------------------------
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// Access to the file name
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//------------------------
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const char * fileName () const;
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//--------------------------
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// Access to the file header
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//--------------------------
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const Header & header () const;
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//----------------------------------
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// Access to the file format version
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//----------------------------------
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int version () const;
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//-----------------------------------------------------------
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// Set the current frame buffer -- copies the FrameBuffer
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// object into the TiledInputFile object.
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//
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// The current frame buffer is the destination for the pixel
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// data read from the file. The current frame buffer must be
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// set at least once before readTile() is called.
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// The current frame buffer can be changed after each call
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// to readTile().
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//-----------------------------------------------------------
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void setFrameBuffer (const FrameBuffer &frameBuffer);
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//-----------------------------------
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// Access to the current frame buffer
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//-----------------------------------
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const FrameBuffer & frameBuffer () const;
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//------------------------------------------------------------
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// Check if the file is complete:
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//
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// isComplete() returns true if all pixels in the data window
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// (in all levels) are present in the input file, or false if
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// any pixels are missing. (Another program may still be busy
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// writing the file, or file writing may have been aborted
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// prematurely.)
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//------------------------------------------------------------
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bool isComplete () const;
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//--------------------------------------------------
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// Utility functions:
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//--------------------------------------------------
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//---------------------------------------------------------
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// Multiresolution mode and tile size:
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// The following functions return the xSize, ySize and mode
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// fields of the file header's TileDescriptionAttribute.
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//---------------------------------------------------------
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unsigned int tileXSize () const;
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unsigned int tileYSize () const;
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LevelMode levelMode () const;
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LevelRoundingMode levelRoundingMode () const;
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//--------------------------------------------------------------------
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// Number of levels:
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//
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// numXLevels() returns the file's number of levels in x direction.
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//
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// if levelMode() == ONE_LEVEL:
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// return value is: 1
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//
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// if levelMode() == MIPMAP_LEVELS:
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// return value is: rfunc (log (max (w, h)) / log (2)) + 1
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//
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// if levelMode() == RIPMAP_LEVELS:
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// return value is: rfunc (log (w) / log (2)) + 1
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//
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// where
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// w is the width of the image's data window, max.x - min.x + 1,
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// y is the height of the image's data window, max.y - min.y + 1,
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// and rfunc(x) is either floor(x), or ceil(x), depending on
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// whether levelRoundingMode() returns ROUND_DOWN or ROUND_UP.
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//
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// numYLevels() returns the file's number of levels in y direction.
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//
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// if levelMode() == ONE_LEVEL or levelMode() == MIPMAP_LEVELS:
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// return value is the same as for numXLevels()
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//
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// if levelMode() == RIPMAP_LEVELS:
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// return value is: rfunc (log (h) / log (2)) + 1
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//
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//
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// numLevels() is a convenience function for use with
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// MIPMAP_LEVELS files.
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//
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// if levelMode() == ONE_LEVEL or levelMode() == MIPMAP_LEVELS:
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// return value is the same as for numXLevels()
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//
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// if levelMode() == RIPMAP_LEVELS:
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// an Iex::LogicExc exception is thrown
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//
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// isValidLevel(lx, ly) returns true if the file contains
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// a level with level number (lx, ly), false if not.
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//
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//--------------------------------------------------------------------
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int numLevels () const;
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int numXLevels () const;
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int numYLevels () const;
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bool isValidLevel (int lx, int ly) const;
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//----------------------------------------------------------
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// Dimensions of a level:
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//
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// levelWidth(lx) returns the width of a level with level
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// number (lx, *), where * is any number.
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//
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// return value is:
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// max (1, rfunc (w / pow (2, lx)))
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//
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//
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// levelHeight(ly) returns the height of a level with level
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// number (*, ly), where * is any number.
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//
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// return value is:
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// max (1, rfunc (h / pow (2, ly)))
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//
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//----------------------------------------------------------
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int levelWidth (int lx) const;
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int levelHeight (int ly) const;
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//--------------------------------------------------------------
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// Number of tiles:
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//
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// numXTiles(lx) returns the number of tiles in x direction
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// that cover a level with level number (lx, *), where * is
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// any number.
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//
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// return value is:
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// (levelWidth(lx) + tileXSize() - 1) / tileXSize()
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//
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//
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// numYTiles(ly) returns the number of tiles in y direction
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// that cover a level with level number (*, ly), where * is
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// any number.
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//
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// return value is:
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// (levelHeight(ly) + tileXSize() - 1) / tileXSize()
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//
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//--------------------------------------------------------------
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int numXTiles (int lx = 0) const;
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int numYTiles (int ly = 0) const;
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//---------------------------------------------------------------
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// Level pixel ranges:
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//
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// dataWindowForLevel(lx, ly) returns a 2-dimensional region of
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// valid pixel coordinates for a level with level number (lx, ly)
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//
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// return value is a Box2i with min value:
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// (dataWindow.min.x, dataWindow.min.y)
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//
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// and max value:
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// (dataWindow.min.x + levelWidth(lx) - 1,
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// dataWindow.min.y + levelHeight(ly) - 1)
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//
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// dataWindowForLevel(level) is a convenience function used
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// for ONE_LEVEL and MIPMAP_LEVELS files. It returns
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// dataWindowForLevel(level, level).
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//
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//---------------------------------------------------------------
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Imath::Box2i dataWindowForLevel (int l = 0) const;
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Imath::Box2i dataWindowForLevel (int lx, int ly) const;
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//-------------------------------------------------------------------
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// Tile pixel ranges:
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//
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// dataWindowForTile(dx, dy, lx, ly) returns a 2-dimensional
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// region of valid pixel coordinates for a tile with tile coordinates
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// (dx,dy) and level number (lx, ly).
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//
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// return value is a Box2i with min value:
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// (dataWindow.min.x + dx * tileXSize(),
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// dataWindow.min.y + dy * tileYSize())
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//
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// and max value:
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// (dataWindow.min.x + (dx + 1) * tileXSize() - 1,
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// dataWindow.min.y + (dy + 1) * tileYSize() - 1)
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//
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// dataWindowForTile(dx, dy, level) is a convenience function
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// used for ONE_LEVEL and MIPMAP_LEVELS files. It returns
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// dataWindowForTile(dx, dy, level, level).
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//
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//-------------------------------------------------------------------
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Imath::Box2i dataWindowForTile (int dx, int dy, int l = 0) const;
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Imath::Box2i dataWindowForTile (int dx, int dy,
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int lx, int ly) const;
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//------------------------------------------------------------
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// Read pixel data:
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//
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// readTile(dx, dy, lx, ly) reads the tile with tile
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// coordinates (dx, dy), and level number (lx, ly),
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// and stores it in the current frame buffer.
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//
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// dx must lie in the interval [0, numXTiles(lx)-1]
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// dy must lie in the interval [0, numYTiles(ly)-1]
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//
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// lx must lie in the interval [0, numXLevels()-1]
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// ly must lie in the inverval [0, numYLevels()-1]
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//
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// readTile(dx, dy, level) is a convenience function used
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// for ONE_LEVEL and MIPMAP_LEVELS files. It calls
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// readTile(dx, dy, level, level).
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//
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// The two readTiles(dx1, dx2, dy1, dy2, ...) functions allow
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// reading multiple tiles at once. If multi-threading is used
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// the multiple tiles are read concurrently.
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//
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// Pixels that are outside the pixel coordinate range for the
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// tile's level, are never accessed by readTile().
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//
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// Attempting to access a tile that is not present in the file
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// throws an InputExc exception.
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//
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//------------------------------------------------------------
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void readTile (int dx, int dy, int l = 0);
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void readTile (int dx, int dy, int lx, int ly);
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void readTiles (int dx1, int dx2, int dy1, int dy2,
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int lx, int ly);
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void readTiles (int dx1, int dx2, int dy1, int dy2,
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int l = 0);
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//--------------------------------------------------
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// Read a tile of raw pixel data from the file,
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// without uncompressing it (this function is
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// used to implement TiledOutputFile::copyPixels()).
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//--------------------------------------------------
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void rawTileData (int &dx, int &dy,
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int &lx, int &ly,
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const char *&pixelData,
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int &pixelDataSize);
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struct Data;
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private:
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friend class InputFile;
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TiledInputFile (const TiledInputFile &); // not implemented
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TiledInputFile & operator = (const TiledInputFile &); // not implemented
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TiledInputFile (const Header &header, IStream *is, int version,
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int numThreads);
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void initialize ();
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bool isValidTile (int dx, int dy,
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int lx, int ly) const;
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size_t bytesPerLineForTile (int dx, int dy,
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int lx, int ly) const;
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Data * _data;
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};
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} // namespace Imf
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#endif
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