1 files changed, 93 insertions, 0 deletions
diff --git a/src/imageplugins/lensdistortion/pixelaccess.h b/src/imageplugins/lensdistortion/pixelaccess.h
new file mode 100644
index 00000000..734d0779
--- /dev/null
+++ b/src/imageplugins/lensdistortion/pixelaccess.h
@@ -0,0 +1,93 @@
+/* ============================================================
+ *
+ * This file is a part of digiKam project
+ * http://www.digikam.org
+ *
+ * Date        : 2004-12-27
+ * Description : acess pixels method for lens distortion algorithm.
+ * 
+ * Copyright (C) 2004-2007 by Gilles Caulier <caulier dot gilles at gmail dot com>
+ * Copyright (C) 2006-2007 by Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
+ * 
+ * This program is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU General
+ * Public License as published by the Free Software Foundation;
+ * either version 2, or (at your option)
+ * any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * ============================================================ */
+
+#ifndef PIXEL_ACCESS_H
+#define PIXEL_ACCESS_H
+
+#define PixelAccessRegions 20
+#define PixelAccessWidth   40
+#define PixelAccessHeight  20
+#define PixelAccessXOffset 3
+#define PixelAccessYOffset 3
+
+// Digikam includes.
+
+#include "dimg.h"
+
+namespace DigikamLensDistortionImagesPlugin
+{
+
+    /* PixelAcess class: solving the eternal problem: random, cubic-interpolated,
+     * sub-pixel coordinate access to an image.
+     * Assuming that accesses are at least slightly coherent, 
+     * PixelAccess keeps PixelAccessRegions buffers, each containing a
+     * PixelAccessWidth x PixelAccessHeight region of pixels.
+     * Buffer[0] is always checked first, so move the last accessed
+     * region into that position.
+     * When a request arrives which is outside all the regions,
+     * get a new region.
+     * The new region is placed so that the requested pixel is positioned
+     * at [PixelAccessXOffset, PixelAccessYOffset] in the region.
+     */
+
+class PixelAccess
+{
+public:
+
+    PixelAccess(Digikam::DImg *srcImage);
+    ~PixelAccess();
+
+    void pixelAccessGetCubic(double srcX, double srcY, double brighten, uchar* dst);
+
+private:
+
+    Digikam::DImg *m_image;
+
+    //uchar* m_buffer[PixelAccessRegions];
+    Digikam::DImg *m_buffer[PixelAccessRegions];
+
+    int    m_width;
+    int    m_height;
+    int    m_depth;
+    int    m_imageWidth;
+    int    m_imageHeight;
+    bool   m_sixteenBit;
+    int    m_tileMinX[PixelAccessRegions];
+    int    m_tileMaxX[PixelAccessRegions];
+    int    m_tileMinY[PixelAccessRegions];
+    int    m_tileMaxY[PixelAccessRegions];
+
+protected:
+
+    inline uchar* pixelAccessAddress(int i, int j);
+    void pixelAccessSelectRegion(int n);
+    void pixelAccessDoEdge(int i, int j);
+    void pixelAccessReposition(int xInt, int yInt);
+    void cubicInterpolate(uchar* src, int rowStride, uchar* dst,
+                          bool sixteenBit, double dx, double dy, double brighten);
+};
+
+}  // NameSpace DigikamLensDistortionImagesPlugin
+
+#endif /* PIXEL_ACCESS_H */