diff --git a/storm/Region.cpp b/storm/Region.cpp
index 21e3d04..4350afe 100644
--- a/storm/Region.cpp
+++ b/storm/Region.cpp
@@ -568,3 +568,25 @@ int32_t SRgnIsRectInRegionf(HSRGN handle, const RECTF* rect) {
     s_rgntable.Unlock(lockedHandle);
     return result;
 }
+
+void SRgnOffsetf(HSRGN handle, float xoffset, float yoffset) {
+    STORM_VALIDATE_BEGIN;
+    STORM_VALIDATE(handle);
+    STORM_VALIDATE_END_VOID;
+
+    HLOCKEDRGN lockedHandle;
+    auto rgn = s_rgntable.Lock(handle, &lockedHandle, 0);
+    if (!rgn) return;
+
+    SOURCE* sourceArray = rgn->source.Ptr();
+    uint32_t sourceRects = rgn->source.Count();
+    for (uint32_t i = 0; i < sourceRects; i++) {
+        sourceArray[i].rect.left += xoffset;
+        sourceArray[i].rect.bottom += yoffset;
+        sourceArray[i].rect.right += xoffset;
+        sourceArray[i].rect.top += yoffset;
+    }
+    InvalidateRegion(rgn);
+
+    s_rgntable.Unlock(lockedHandle);
+}
diff --git a/storm/Region.hpp b/storm/Region.hpp
index df54302..8d5d3a6 100644
--- a/storm/Region.hpp
+++ b/storm/Region.hpp
@@ -24,5 +24,6 @@ int32_t SRgnIsPointInRegionf(HSRGN handle, float x, float y);
 
 int32_t SRgnIsRectInRegionf(HSRGN handle, const RECTF* rect);
 
+void SRgnOffsetf(HSRGN handle, float xoffset, float yoffset);
 
 #endif
diff --git a/test/Region.cpp b/test/Region.cpp
index b4b5852..495ce18 100644
--- a/test/Region.cpp
+++ b/test/Region.cpp
@@ -373,3 +373,66 @@ TEST_CASE("SRgnIsRectInRegionf", "[region]") {
         CHECK_FALSE(SRgnIsRectInRegionf(region, &checkRects[5]));
     }
 }
+
+TEST_CASE("SRgnOffsetf", "[region]") {
+    RgnDataTest region;
+
+    SECTION("shifts rects by given amount") {
+        RECTF rects[] = {
+            { 0.0f, 0.0f, 100.0f, 100.0f },
+            { -200.0f, -200.0f, -100.0f, -100.0f }
+        };
+
+        SRgnCombineRectf(region, &rects[0], nullptr, SRGN_OR);
+        SRgnCombineRectf(region, &rects[1], nullptr, SRGN_OR);
+
+        SRgnOffsetf(region, 100.0f, 50.0f);
+
+        uint32_t numRects = 2;
+        RECTF buffer[2];
+        SRgnGetRectsf(region, &numRects, buffer);
+
+        CHECK_THAT(buffer[0], MatchesRect({ -100.0f, -150.0f, 0.0f, -50.0f }));
+        CHECK_THAT(buffer[1], MatchesRect({ 100.0f, 50.0f, 200.0f, 150.0f }));
+    }
+
+    SECTION("shifts rects back to their original positions with opposite amounts") {
+        RECTF rects[] = {
+            { 0.0f, 0.0f, 100.0f, 100.0f },
+            { -200.0f, -200.0f, -100.0f, -100.0f }
+        };
+
+        SRgnCombineRectf(region, &rects[0], nullptr, SRGN_OR);
+        SRgnCombineRectf(region, &rects[1], nullptr, SRGN_OR);
+
+        SRgnOffsetf(region, 100.0f, 50.0f);
+        SRgnOffsetf(region, 5.0f, 10.0f);
+        SRgnOffsetf(region, -105.0f, -60.0f);
+
+        uint32_t numRects = 2;
+        RECTF buffer[2];
+        SRgnGetRectsf(region, &numRects, buffer);
+
+        CHECK_THAT(buffer[0], MatchesRect(rects[1]));
+        CHECK_THAT(buffer[1], MatchesRect(rects[0]));
+    }
+
+    SECTION("doesn't shift anything with 0") {
+        RECTF rects[] = {
+            { 0.0f, 0.0f, 100.0f, 100.0f },
+            { -200.0f, -200.0f, -100.0f, -100.0f }
+        };
+
+        SRgnCombineRectf(region, &rects[0], nullptr, SRGN_OR);
+        SRgnCombineRectf(region, &rects[1], nullptr, SRGN_OR);
+
+        SRgnOffsetf(region, 0.0f, 0.0f);
+
+        uint32_t numRects = 2;
+        RECTF buffer[2];
+        SRgnGetRectsf(region, &numRects, buffer);
+
+        CHECK_THAT(buffer[0], MatchesRect(rects[1]));
+        CHECK_THAT(buffer[1], MatchesRect(rects[0]));
+    }
+}