fix OpenCL memory leak

experimental/skpdiff/SkCLImageDiffer.cpp

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <cstring>
 
@@ skipping 169 matching lines @@
     }
 
     // This makes things totally synchronous. Actual queue is not ready yet
     clWaitForEvents(1, &event);
     diff->finished = true;
 
     // Immediate read back the results
     clEnqueueReadBuffer(fCommandQueue, diff->resultsBuffer, CL_TRUE, 0, sizeof(int), &numDiffPixels, 0, NULL, NULL);
     diff->result *= (double)numDiffPixels;
     diff->result = (1.0 - diff->result);
+
+    // Release all the buffers created
+    clReleaseMemObject(diff->resultsBuffer);
+    clReleaseMemObject(diff->baseline);
+    clReleaseMemObject(diff->test);
+
     SkDebugf("Time: %f\n", (get_seconds() - startTime));
 
     return diffID;
 }
 
 bool SkDifferentPixelsImageDiffer::isFinished(int id) {
     return fQueuedDiffs[id].finished;
 }
 
 double SkDifferentPixelsImageDiffer::getResult(int id) {
     return fQueuedDiffs[id].result;
 }
 
 
 bool SkDifferentPixelsImageDiffer::onInit() {
     if (!loadKernelFile("experimental/skpdiff/diff_pixels.cl", "diff", &fKernel)) {
         return false;
     }
 
     return true;
 }