diff --git a/storm/Region.cpp b/storm/Region.cpp
index 1dd0586..21e3d04 100644
--- a/storm/Region.cpp
+++ b/storm/Region.cpp
@@ -541,3 +541,30 @@ int32_t SRgnIsPointInRegionf(HSRGN handle, float x, float y) {
     s_rgntable.Unlock(lockedHandle);
     return result;
 }
+
+int32_t SRgnIsRectInRegionf(HSRGN handle, const RECTF* rect) {
+    STORM_VALIDATE_BEGIN;
+    STORM_VALIDATE(handle);
+    STORM_VALIDATE(rect);
+    STORM_VALIDATE_END;
+
+    HLOCKEDRGN lockedHandle;
+    auto rgn = s_rgntable.Lock(handle, &lockedHandle, 0);
+    if (!rgn) return 0;
+
+    int32_t result = 0;
+
+    SOURCE* sourceArray = rgn->source.Ptr();
+    uint32_t sourceRects = rgn->source.Count();
+    for (uint32_t i = 0; i < sourceRects; i++) {
+        if (!(sourceArray[i].flags & SF_PARAMONLY)) {
+            if (CheckForIntersection(rect, &sourceArray[i].rect)) {
+                result = 1;
+                break;
+            }
+        }
+    }
+
+    s_rgntable.Unlock(lockedHandle);
+    return result;
+}
diff --git a/storm/Region.hpp b/storm/Region.hpp
index cca20a7..df54302 100644
--- a/storm/Region.hpp
+++ b/storm/Region.hpp
@@ -22,5 +22,7 @@ void SRgnGetRectsf(HSRGN handle, uint32_t* numRects, RECTF* buffer);
 
 int32_t SRgnIsPointInRegionf(HSRGN handle, float x, float y);
 
+int32_t SRgnIsRectInRegionf(HSRGN handle, const RECTF* rect);
+
 
 #endif
diff --git a/test/Region.cpp b/test/Region.cpp
index 100cf7c..b4b5852 100644
--- a/test/Region.cpp
+++ b/test/Region.cpp
@@ -297,3 +297,79 @@ TEST_CASE("SRgnIsPointInRegionf", "[region]") {
         CHECK_FALSE(SRgnIsPointInRegionf(region, 0.9999f, 1.0f));
     }
 }
+
+TEST_CASE("SRgnIsRectInRegionf", "[region]") {
+    RgnDataTest region;
+    RECTF rect = { 0.0f, 0.0f, 1.0f, 1.0f };
+
+    SECTION("false if region has no rects") {
+        CHECK_FALSE(SRgnIsRectInRegionf(region, &rect));
+    }
+
+    SECTION("false if using an invalid region object") {
+        HSRGN inval = reinterpret_cast<HSRGN>(1234);
+        CHECK_FALSE(SRgnIsRectInRegionf(inval, &rect));
+    }
+
+    SECTION("reports if rects overlap a region") {
+        RECTF checkRects[] = {
+            { 0.5f, 0.5f, 0.5f, 0.5f },
+            { 0.00001f, 0.00001f, 0.999999f, 0.999999f },
+            { 11.0f, 11.0f, 12.0f, 19.0f },
+            { 14.0f, 14.0f, 20.0f, 20.0f },
+            { -100.0f, -100.0f, 0.000001f, 0.0000001f },
+        };
+
+        RECTF secondRect = { 10.0f, 10.0f, 15.0f, 20.0f };
+        SRgnCombineRectf(region, &rect, nullptr, SRGN_OR);
+        SRgnCombineRectf(region, &secondRect, nullptr, SRGN_OR);
+
+        CHECK(SRgnIsRectInRegionf(region, &checkRects[0]));
+        CHECK(SRgnIsRectInRegionf(region, &checkRects[1]));
+        CHECK(SRgnIsRectInRegionf(region, &checkRects[2]));
+        CHECK(SRgnIsRectInRegionf(region, &checkRects[3]));
+        CHECK(SRgnIsRectInRegionf(region, &checkRects[4]));
+    }
+
+    SECTION("reports if rects are outside a region") {
+        RECTF checkRects[] = {
+            { 2.0f, 2.0f, 2.0f, 2.0f },
+            { 1.0f, 1.0f, 2.0f, 2.0f },
+            { -1.0f, -1.0f, 0.0f, 0.0f },
+            { 9.0f, 9.0f, 10.0f, 10.0f }
+        };
+
+        RECTF secondRect = { 10.0f, 10.0f, 15.0f, 20.0f };
+        SRgnCombineRectf(region, &rect, nullptr, SRGN_OR);
+        SRgnCombineRectf(region, &secondRect, nullptr, SRGN_OR);
+
+        CHECK_FALSE(SRgnIsRectInRegionf(region, &checkRects[0]));
+        CHECK_FALSE(SRgnIsRectInRegionf(region, &checkRects[1]));
+        CHECK_FALSE(SRgnIsRectInRegionf(region, &checkRects[2]));
+        CHECK_FALSE(SRgnIsRectInRegionf(region, &checkRects[3]));
+    }
+
+    SECTION("ignores param only rects") {
+        SRgnCombineRectf(region, &rect, &rect, SRGN_PARAMONLY);
+        CHECK_FALSE(SRgnIsRectInRegionf(region, &rect));
+    }
+
+    SECTION("excludes matching on rect bounds") {
+        RECTF checkRects[] = {
+            { -0.1f, -0.1f, 0.0f, 1.0f },
+            { -0.1f, -0.1f, 1.0f, 0.0f },
+            { 1.0f, 1.0f, 1.0f, 1.0f },
+            { 0.0f, 0.0f, 0.0f, 0.0f },
+            { 0.5f, 0.0f, 0.5f, 0.0f },
+            { 0.0f, 0.5f, 0.0f, 0.5f },
+        };
+        SRgnCombineRectf(region, &rect, nullptr, SRGN_OR);
+
+        CHECK_FALSE(SRgnIsRectInRegionf(region, &checkRects[0]));
+        CHECK_FALSE(SRgnIsRectInRegionf(region, &checkRects[1]));
+        CHECK_FALSE(SRgnIsRectInRegionf(region, &checkRects[2]));
+        CHECK_FALSE(SRgnIsRectInRegionf(region, &checkRects[3]));
+        CHECK_FALSE(SRgnIsRectInRegionf(region, &checkRects[4]));
+        CHECK_FALSE(SRgnIsRectInRegionf(region, &checkRects[5]));
+    }
+}