diff --git a/include/hardware/hwcomposer.h b/include/hardware/hwcomposer.h
index d75a047..9492d3a 100644
--- a/include/hardware/hwcomposer.h
+++ b/include/hardware/hwcomposer.h
@@ -54,6 +54,13 @@
     int bottom;
 } hwc_rect_t;
 
+typedef struct hwc_frect {
+    float left;
+    float top;
+    float right;
+    float bottom;
+} hwc_frect_t;
+
 typedef struct hwc_region {
     size_t numRects;
     hwc_rect_t const* rects;
@@ -149,8 +156,17 @@
             int32_t blending;
 
             /* area of the source to consider, the origin is the top-left corner of
-             * the buffer */
-            hwc_rect_t sourceCrop;
+             * the buffer. As of HWC_DEVICE_API_VERSION_1_3, sourceRect uses floats.
+             * If the h/w can't support a non-integer source crop rectangle, it should
+             * punt to OpenGL ES composition.
+             */
+            union {
+                // crop rectangle in integer (pre HWC_DEVICE_API_VERSION_1_3)
+                hwc_rect_t sourceCropi;
+                hwc_rect_t sourceCrop; // just for source compatibility
+                // crop rectangle in floats (as of HWC_DEVICE_API_VERSION_1_3)
+                hwc_frect_t sourceCropf;
+            };
 
             /* where to composite the sourceCrop onto the display. The sourceCrop
              * is scaled using linear filtering to the displayFrame. The origin is the
diff --git a/include/hardware/hwcomposer_defs.h b/include/hardware/hwcomposer_defs.h
index 1edfd3d..ce4723c 100644
--- a/include/hardware/hwcomposer_defs.h
+++ b/include/hardware/hwcomposer_defs.h
@@ -35,6 +35,7 @@
 #define HWC_DEVICE_API_VERSION_1_0  HARDWARE_DEVICE_API_VERSION_2(1, 0, HWC_HEADER_VERSION)
 #define HWC_DEVICE_API_VERSION_1_1  HARDWARE_DEVICE_API_VERSION_2(1, 1, HWC_HEADER_VERSION)
 #define HWC_DEVICE_API_VERSION_1_2  HARDWARE_DEVICE_API_VERSION_2(1, 2, HWC_HEADER_VERSION)
+#define HWC_DEVICE_API_VERSION_1_3  HARDWARE_DEVICE_API_VERSION_2(1, 3, HWC_HEADER_VERSION)
 
 enum {
     /* hwc_composer_device_t::set failed in EGL */