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diff --git a/xBRZ/src/xbrz.h b/xBRZ/src/xbrz.h
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+// ****************************************************************************
+// * This file is part of the xBRZ project. It is distributed under           *
+// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0         *
+// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved          *
+// *                                                                          *
+// * Additionally and as a special exception, the author gives permission     *
+// * to link the code of this program with the following libraries            *
+// * (or with modified versions that use the same licenses), and distribute   *
+// * linked combinations including the two: MAME, FreeFileSync, Snes9x, ePSXe *
+// * You must obey the GNU General Public License in all respects for all of  *
+// * the code used other than MAME, FreeFileSync, Snes9x, ePSXe.              *
+// * If you modify this file, you may extend this exception to your version   *
+// * of the file, but you are not obligated to do so. If you do not wish to   *
+// * do so, delete this exception statement from your version.                *
+// ****************************************************************************
+
+#ifndef XBRZ_HEADER_3847894708239054
+#define XBRZ_HEADER_3847894708239054
+
+#include <cstddef> //size_t
+#include <cstdint> //uint32_t
+#include <limits>
+#include "xbrz_config.h"
+
+
+namespace xbrz
+{
+/*
+-------------------------------------------------------------------------
+| xBRZ: "Scale by rules" - high quality image upscaling filter by Zenju |
+-------------------------------------------------------------------------
+using a modified approach of xBR:
+http://board.byuu.org/viewtopic.php?f=10&t=2248
+- new rule set preserving small image features
+- highly optimized for performance
+- support alpha channel
+- support multithreading
+- support 64-bit architectures
+- support processing image slices
+- support scaling up to 6xBRZ
+*/
+
+enum class ColorFormat //from high bits -> low bits, 8 bit per channel
+{
+    RGB,  //8 bit for each red, green, blue, upper 8 bits unused
+    ARGB, //including alpha channel, BGRA byte order on little-endian machines
+    ARGB_UNBUFFERED, //like ARGB, but without the one-time buffer creation overhead (ca. 100 - 300 ms) at the expense of a slightly slower scaling time
+};
+
+const int SCALE_FACTOR_MAX = 6;
+
+/*
+-> map source (srcWidth * srcHeight) to target (scale * width x scale * height) image, optionally processing a half-open slice of rows [yFirst, yLast) only
+-> support for source/target pitch in bytes!
+-> if your emulator changes only a few image slices during each cycle (e.g. DOSBox) then there's no need to run xBRZ on the complete image:
+   Just make sure you enlarge the source image slice by 2 rows on top and 2 on bottom (this is the additional range the xBRZ algorithm is using during analysis)
+   CAVEAT: If there are multiple changed slices, make sure they do not overlap after adding these additional rows in order to avoid a memory race condition
+   in the target image data if you are using multiple threads for processing each enlarged slice!
+
+THREAD-SAFETY: - parts of the same image may be scaled by multiple threads as long as the [yFirst, yLast) ranges do not overlap!
+               - there is a minor inefficiency for the first row of a slice, so avoid processing single rows only; suggestion: process at least 8-16 rows
+*/
+void scale(size_t factor, //valid range: 2 - SCALE_FACTOR_MAX
+           const uint32_t* src, uint32_t* trg, int srcWidth, int srcHeight,
+           ColorFormat colFmt,
+           const ScalerCfg& cfg = ScalerCfg(),
+           int yFirst = 0, int yLast = std::numeric_limits<int>::max()); //slice of source image
+
+void bilinearScale(const uint32_t* src, int srcWidth, int srcHeight,
+                   /**/  uint32_t* trg, int trgWidth, int trgHeight);
+
+void nearestNeighborScale(const uint32_t* src, int srcWidth, int srcHeight,
+                          /**/  uint32_t* trg, int trgWidth, int trgHeight);
+
+
+//parameter tuning
+bool equalColorTest(uint32_t col1, uint32_t col2, ColorFormat colFmt, double luminanceWeight, double equalColorTolerance);
+}
+
+#endif