Adding an example to integration of DXCam and OpenCV for real-time screen capture and FPS display

examples/screen_capture_with_opencv.py

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+import dxcam
+import cv2
+import time
+
+# Create a DXCamera instance
+camera = dxcam.create()
+
+# Set the region to capture
+left, top = (1920 - 640) // 2, (1080 - 640) // 2
+right, bottom = left + 640, top + 640
+region = (left, top, right, bottom)
+
+# Start the screen capture
+camera.start(region=region)
+
+# Initialize variables for FPS calculation
+frames = 0
+start_time = time.time()
+
+while True:
+    # Get the latest frame from the frame buffer
+    frame = camera.get_latest_frame()
+
+    # Display the FPS on the captured screen
+    frames += 1
+    if time.time() - start_time > 1:
+        fps = frames / (time.time() - start_time)
+        cv2.putText(frame, f"FPS: {fps:.2f}", (10, 30), cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 0, 255), 2)
+        frames = 0
+        start_time = time.time()
+
+    # Display the captured screen
+    cv2.imshow("Screen Capture", frame)
+
+    # Check if the user pressed 'q' to quit
+    if cv2.waitKey(1) & 0xFF == ord('q'):
+        break
+
+# Stop the screen capture
+camera.stop()
+
+# Release the resources
+cv2.destroyAllWindows()