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385 lines
8.9 KiB
385 lines
8.9 KiB
/////////////////////////////////////////////////////////////////////////// |
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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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