386 lines
9.1 KiB
C++
386 lines
9.1 KiB
C++
///////////////////////////////////////////////////////////////////////////
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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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//-----------------------------------------------------------------------------
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//
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// class TileOffsets
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//
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//-----------------------------------------------------------------------------
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#include <ImfTileOffsets.h>
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#include <ImfXdr.h>
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#include <ImfIO.h>
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#include "Iex.h"
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namespace Imf {
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TileOffsets::TileOffsets (LevelMode mode,
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int numXLevels, int numYLevels,
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const int *numXTiles, const int *numYTiles)
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:
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_mode (mode),
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_numXLevels (numXLevels),
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_numYLevels (numYLevels)
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{
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switch (_mode)
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{
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case ONE_LEVEL:
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case MIPMAP_LEVELS:
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_offsets.resize (_numXLevels);
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for (unsigned int l = 0; l < _offsets.size(); ++l)
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{
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_offsets[l].resize (numYTiles[l]);
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for (unsigned int dy = 0; dy < _offsets[l].size(); ++dy)
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{
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_offsets[l][dy].resize (numXTiles[l]);
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}
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}
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break;
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case RIPMAP_LEVELS:
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_offsets.resize (_numXLevels * _numYLevels);
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for (unsigned int ly = 0; ly < _numYLevels; ++ly)
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{
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for (unsigned int lx = 0; lx < _numXLevels; ++lx)
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{
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int l = ly * _numXLevels + lx;
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_offsets[l].resize (numYTiles[ly]);
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for (unsigned int dy = 0; dy < _offsets[l].size(); ++dy)
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{
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_offsets[l][dy].resize (numXTiles[lx]);
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}
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}
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}
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break;
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}
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}
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bool
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TileOffsets::anyOffsetsAreInvalid () const
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{
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for (unsigned int l = 0; l < _offsets.size(); ++l)
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for (unsigned int dy = 0; dy < _offsets[l].size(); ++dy)
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for (unsigned int dx = 0; dx < _offsets[l][dy].size(); ++dx)
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if (_offsets[l][dy][dx] <= 0)
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return true;
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return false;
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}
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void
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TileOffsets::findTiles (IStream &is)
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{
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for (unsigned int l = 0; l < _offsets.size(); ++l)
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{
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for (unsigned int dy = 0; dy < _offsets[l].size(); ++dy)
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{
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for (unsigned int dx = 0; dx < _offsets[l][dy].size(); ++dx)
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{
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Int64 tileOffset = is.tellg();
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int tileX;
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Xdr::read <StreamIO> (is, tileX);
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int tileY;
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Xdr::read <StreamIO> (is, tileY);
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int levelX;
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Xdr::read <StreamIO> (is, levelX);
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int levelY;
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Xdr::read <StreamIO> (is, levelY);
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int dataSize;
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Xdr::read <StreamIO> (is, dataSize);
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Xdr::skip <StreamIO> (is, dataSize);
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if (!isValidTile(tileX, tileY, levelX, levelY))
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return;
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operator () (tileX, tileY, levelX, levelY) = tileOffset;
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}
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}
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}
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}
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void
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TileOffsets::reconstructFromFile (IStream &is)
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{
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//
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// Try to reconstruct a missing tile offset table by sequentially
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// scanning through the file, and recording the offsets in the file
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// of the tiles we find.
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//
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Int64 position = is.tellg();
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try
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{
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findTiles (is);
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}
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catch (...)
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{
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//
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// Suppress all exceptions. This function is called only to
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// reconstruct the tile offset table for incomplete files,
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// and exceptions are likely.
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//
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}
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is.clear();
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is.seekg (position);
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}
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void
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TileOffsets::readFrom (IStream &is, bool &complete)
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{
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//
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// Read in the tile offsets from the file's tile offset table
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//
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for (unsigned int l = 0; l < _offsets.size(); ++l)
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for (unsigned int dy = 0; dy < _offsets[l].size(); ++dy)
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for (unsigned int dx = 0; dx < _offsets[l][dy].size(); ++dx)
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Xdr::read <StreamIO> (is, _offsets[l][dy][dx]);
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//
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// Check if any tile offsets are invalid.
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//
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// Invalid offsets mean that the file is probably incomplete
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// (the offset table is the last thing written to the file).
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// Either some process is still busy writing the file, or
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// writing the file was aborted.
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//
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// We should still be able to read the existing parts of the
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// file. In order to do this, we have to make a sequential
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// scan over the scan tile to reconstruct the tile offset
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// table.
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//
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if (anyOffsetsAreInvalid())
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{
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complete = false;
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reconstructFromFile (is);
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}
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else
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{
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complete = true;
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}
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}
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Int64
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TileOffsets::writeTo (OStream &os) const
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{
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//
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// Write the tile offset table to the file, and
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// return the position of the start of the table
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// in the file.
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//
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Int64 pos = os.tellp();
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if (pos == -1)
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Iex::throwErrnoExc ("Cannot determine current file position (%T).");
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for (unsigned int l = 0; l < _offsets.size(); ++l)
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for (unsigned int dy = 0; dy < _offsets[l].size(); ++dy)
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for (unsigned int dx = 0; dx < _offsets[l][dy].size(); ++dx)
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Xdr::write <StreamIO> (os, _offsets[l][dy][dx]);
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return pos;
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}
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bool
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TileOffsets::isEmpty () const
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{
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for (unsigned int l = 0; l < _offsets.size(); ++l)
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for (unsigned int dy = 0; dy < _offsets[l].size(); ++dy)
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for (unsigned int dx = 0; dx < _offsets[l][dy].size(); ++dx)
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if (_offsets[l][dy][dx] != 0)
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return false;
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return true;
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}
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bool
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TileOffsets::isValidTile (int dx, int dy, int lx, int ly) const
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{
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switch (_mode)
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{
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case ONE_LEVEL:
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if (lx == 0 &&
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ly == 0 &&
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_offsets.size() > 0 &&
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_offsets[0].size() > dy &&
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_offsets[0][dy].size() > dx)
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{
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return true;
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}
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break;
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case MIPMAP_LEVELS:
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if (lx < _numXLevels &&
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ly < _numYLevels &&
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_offsets.size() > lx &&
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_offsets[lx].size() > dy &&
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_offsets[lx][dy].size() > dx)
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{
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return true;
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}
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break;
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case RIPMAP_LEVELS:
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if (lx < _numXLevels &&
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ly < _numYLevels &&
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_offsets.size() > lx + ly * _numXLevels &&
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_offsets[lx + ly * _numXLevels].size() > dy &&
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_offsets[lx + ly * _numXLevels][dy].size() > dx)
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{
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return true;
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}
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break;
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default:
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return false;
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}
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return false;
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}
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Int64 &
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TileOffsets::operator () (int dx, int dy, int lx, int ly)
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{
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//
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// Looks up the value of the tile with tile coordinate (dx, dy)
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// and level number (lx, ly) in the _offsets array, and returns
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// the cooresponding offset.
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//
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switch (_mode)
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{
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case ONE_LEVEL:
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return _offsets[0][dy][dx];
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break;
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case MIPMAP_LEVELS:
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return _offsets[lx][dy][dx];
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break;
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case RIPMAP_LEVELS:
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return _offsets[lx + ly * _numXLevels][dy][dx];
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break;
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default:
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throw Iex::ArgExc ("Unknown LevelMode format.");
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}
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}
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Int64 &
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TileOffsets::operator () (int dx, int dy, int l)
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{
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return operator () (dx, dy, l, l);
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}
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const Int64 &
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TileOffsets::operator () (int dx, int dy, int lx, int ly) const
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{
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//
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// Looks up the value of the tile with tile coordinate (dx, dy)
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// and level number (lx, ly) in the _offsets array, and returns
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// the cooresponding offset.
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//
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switch (_mode)
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{
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case ONE_LEVEL:
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return _offsets[0][dy][dx];
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break;
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case MIPMAP_LEVELS:
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return _offsets[lx][dy][dx];
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break;
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case RIPMAP_LEVELS:
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return _offsets[lx + ly * _numXLevels][dy][dx];
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break;
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default:
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throw Iex::ArgExc ("Unknown LevelMode format.");
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}
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}
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const Int64 &
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TileOffsets::operator () (int dx, int dy, int l) const
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{
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return operator () (dx, dy, l, l);
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}
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} // namespace Imf
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