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94 lines
2.9 KiB
94 lines
2.9 KiB
/* ============================================================
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*
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* This file is a part of digiKam project
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* http://www.digikam.org
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*
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* Date : 2004-12-27
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* Description : acess pixels method for lens distortion algorithm.
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*
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* Copyright (C) 2004-2007 by Gilles Caulier <caulier dot gilles at gmail dot com>
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* Copyright (C) 2006-2007 by Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software Foundation;
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* either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* ============================================================ */
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#ifndef PIXEL_ACCESS_H
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#define PIXEL_ACCESS_H
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#define PixelAccessRegions 20
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#define PixelAccessWidth 40
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#define PixelAccessHeight 20
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#define PixelAccessXOffset 3
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#define PixelAccessYOffset 3
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// Digikam includes.
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#include "dimg.h"
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namespace DigikamLensDistortionImagesPlugin
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{
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/* PixelAcess class: solving the eternal problem: random, cubic-interpolated,
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* sub-pixel coordinate access to an image.
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* Assuming that accesses are at least slightly coherent,
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* PixelAccess keeps PixelAccessRegions buffers, each containing a
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* PixelAccessWidth x PixelAccessHeight region of pixels.
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* Buffer[0] is always checked first, so move the last accessed
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* region into that position.
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* When a request arrives which is outside all the regions,
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* get a new region.
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* The new region is placed so that the requested pixel is positioned
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* at [PixelAccessXOffset, PixelAccessYOffset] in the region.
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*/
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class PixelAccess
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{
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public:
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PixelAccess(Digikam::DImg *srcImage);
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~PixelAccess();
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void pixelAccessGetCubic(double srcX, double srcY, double brighten, uchar* dst);
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private:
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Digikam::DImg *m_image;
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//uchar* m_buffer[PixelAccessRegions];
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Digikam::DImg *m_buffer[PixelAccessRegions];
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int m_width;
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int m_height;
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int m_depth;
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int m_imageWidth;
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int m_imageHeight;
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bool m_sixteenBit;
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int m_tileMinX[PixelAccessRegions];
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int m_tileMaxX[PixelAccessRegions];
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int m_tileMinY[PixelAccessRegions];
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int m_tileMaxY[PixelAccessRegions];
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protected:
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inline uchar* pixelAccessAddress(int i, int j);
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void pixelAccessSelectRegion(int n);
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void pixelAccessDoEdge(int i, int j);
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void pixelAccessReposition(int xInt, int yInt);
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void cubicInterpolate(uchar* src, int rowStride, uchar* dst,
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bool sixteenBit, double dx, double dy, double brighten);
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};
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} // NameSpace DigikamLensDistortionImagesPlugin
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#endif /* PIXEL_ACCESS_H */
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