mirror of
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68 lines
3.2 KiB
C++
68 lines
3.2 KiB
C++
/* FasTC
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* Copyright (c) 2012 University of North Carolina at Chapel Hill. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and its documentation for educational,
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* research, and non-profit purposes, without fee, and without a written agreement is hereby granted,
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* provided that the above copyright notice, this paragraph, and the following four paragraphs appear
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* in all copies.
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*
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* Permission to incorporate this software into commercial products may be obtained by contacting the
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* authors or the Office of Technology Development at the University of North Carolina at Chapel Hill <otd@unc.edu>.
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*
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* This software program and documentation are copyrighted by the University of North Carolina at Chapel Hill.
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* The software program and documentation are supplied "as is," without any accompanying services from the
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* University of North Carolina at Chapel Hill or the authors. The University of North Carolina at Chapel Hill
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* and the authors do not warrant that the operation of the program will be uninterrupted or error-free. The
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* end-user understands that the program was developed for research purposes and is advised not to rely
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* exclusively on the program for any reason.
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*
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* IN NO EVENT SHALL THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE AUTHORS BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE
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* USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE
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* AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ANY
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* STATUTORY WARRANTY OF NON-INFRINGEMENT. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY
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* OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS HAVE NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
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* ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Please send all BUG REPORTS to <pavel@cs.unc.edu>.
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*
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* The authors may be contacted via:
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*
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* Pavel Krajcevski
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* Dept of Computer Science
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* 201 S Columbia St
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* Frederick P. Brooks, Jr. Computer Science Bldg
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* Chapel Hill, NC 27599-3175
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* USA
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*
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* <http://gamma.cs.unc.edu/FasTC/>
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*/
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#include "ImageWriter.h"
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uint32 ImageWriter::GetChannelForPixel(uint32 x, uint32 y, uint32 ch) {
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// Assume pixels are in block stream order, hence we would need to first find
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// the block that contains pixel (x, y) and then find the byte location for it.
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const uint32 blocksPerRow = GetWidth() / 4;
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const uint32 blockIdxX = x / 4;
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const uint32 blockIdxY = y / 4;
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const uint32 blockIdx = blockIdxY * blocksPerRow + blockIdxX;
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// Now we find the offset in the block
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const uint32 blockOffsetX = x % 4;
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const uint32 blockOffsetY = y % 4;
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const uint32 pixelOffset = blockOffsetY * 4 + blockOffsetX;
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// There are 16 pixels per block and bytes per pixel...
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uint32 dataOffset = blockIdx * 4 * 16;
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dataOffset += 4 * pixelOffset;
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dataOffset += ch;
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return m_PixelData[dataOffset];
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}
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