i had issues applying the xbrz patch and had to revert manually several times, and forgot to add the new files as a result

so here they are.

src/filters/xBRZ/config.h

@@ -0,0 +1,40 @@
+// ****************************************************************************
+// * This file is part of the HqMAME project. It is distributed under         *
+// * GNU General Public License: http://www.gnu.org/licenses/gpl.html         *
+// * 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 MAME library (or with modified *
+// * versions of MAME that use the same license as MAME), and distribute      *
+// * linked combinations including the two. You must obey the GNU General     *
+// * Public License in all respects for all of the code used other than MAME. *
+// * 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_CONFIG_HEADER_284578425345
+#define XBRZ_CONFIG_HEADER_284578425345
+
+//do NOT include any headers here! used by xBRZ_dll!!!
+
+namespace xbrz
+{
+struct ScalerCfg
+{
+    ScalerCfg() :
+        luminanceWeight_(1),
+        equalColorTolerance_(30),
+        dominantDirectionThreshold(3.6),
+        steepDirectionThreshold(2.2),
+        newTestAttribute_(0) {}
+
+    double luminanceWeight_;
+    double equalColorTolerance_;
+    double dominantDirectionThreshold;
+    double steepDirectionThreshold;
+    double newTestAttribute_; //unused; test new parameters
+};
+}
+
+#endif

src/filters/xBRZ/xbrz.h

@@ -0,0 +1,86 @@
+// ****************************************************************************
+// * This file is part of the HqMAME project. It is distributed under         *
+// * GNU General Public License: http://www.gnu.org/licenses/gpl.html         *
+// * 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 MAME library (or with modified *
+// * versions of MAME that use the same license as MAME), and distribute      *
+// * linked combinations including the two. You must obey the GNU General     *
+// * Public License in all respects for all of the code used other than MAME. *
+// * 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 <stdint.h> //uint32_t
+#include <limits>
+#include "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
+- support multithreading
+- support 64 bit architectures
+- support processing image slices
+*/
+
+/*
+-> map source (srcWidth * srcHeight) to target (scale * width x scale * height) image, optionally processing a half-open slice of rows [yFirst, yLast) only
+-> color format: ARGB (BGRA byte order), alpha channel unused
+-> 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
+*/
+void scale(size_t factor, //valid range: 2 - 5
+           const uint32_t* src, int srcWidth, int srcHeight, int srcPitch,
+           uint32_t* trg, int trgPitch,
+           const ScalerCfg& cfg = ScalerCfg(),
+           int yFirst = 0, int yLast = std::numeric_limits<int>::max()); //slice of source image
+
+void nearestNeighborScale(const uint32_t* src, int srcWidth, int srcHeight,
+                          uint32_t* trg, int trgWidth, int trgHeight);
+
+enum SliceType
+{
+    NN_SCALE_SLICE_SOURCE,
+    NN_SCALE_SLICE_TARGET,
+};
+void nearestNeighborScale(const uint32_t* src, int srcWidth, int srcHeight, int srcPitch, //pitch in bytes!
+                          uint32_t* trg, int trgWidth, int trgHeight, int trgPitch,
+                          SliceType st, int yFirst, int yLast);
+
+//parameter tuning
+bool equalColorTest(uint32_t col1, uint32_t col2, double luminanceWeight, double equalColorTolerance);
+
+
+
+
+
+//########################### implementation ###########################
+inline
+void nearestNeighborScale(const uint32_t* src, int srcWidth, int srcHeight,
+                          uint32_t* trg, int trgWidth, int trgHeight)
+{
+    nearestNeighborScale(src, srcWidth, srcHeight, srcWidth * sizeof(uint32_t),
+                         trg, trgWidth, trgHeight, trgWidth * sizeof(uint32_t),
+                         NN_SCALE_SLICE_TARGET, 0, trgHeight);
+}
+}
+
+#endif

src/filters/xbrzfilter.cpp

@@ -0,0 +1,23 @@
+#include "../System.h"
+
+#include "xBRZ/xbrz.h"
+
+void xbrz2x32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */, u8 *dstPtr, u32 dstPitch, int width, int height)
+{
+    xbrz::scale(2, (const uint32_t *)srcPtr, width, height, srcPitch, (uint32_t *)dstPtr, dstPitch);
+}
+
+void xbrz3x32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */, u8 *dstPtr, u32 dstPitch, int width, int height)
+{
+    xbrz::scale(3, (const uint32_t *)srcPtr, width, height, srcPitch, (uint32_t *)dstPtr, dstPitch);
+}
+
+void xbrz4x32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */, u8 *dstPtr, u32 dstPitch, int width, int height)
+{
+    xbrz::scale(4, (const uint32_t *)srcPtr, width, height, srcPitch, (uint32_t *)dstPtr, dstPitch);
+}
+
+void xbrz5x32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */, u8 *dstPtr, u32 dstPitch, int width, int height)
+{
+    xbrz::scale(5, (const uint32_t *)srcPtr, width, height, srcPitch, (uint32_t *)dstPtr, dstPitch);
+}