- added missing loadLibrary for inner classes

- added zero check for pointers in utils.cpp

modules/java/gen_java.py

@@ -624,6 +624,7 @@ JNIEXPORT $rtype JNICALL Java_org_opencv_${module}_$fname
             )
 
             self.java_code.write(indent_m + "// native stuff\n\n")
+            self.java_code.write(indent_m + 'static { System.loadLibrary("opencv_java"); }\n')
             self.java_code.write( jn_code.getvalue() )
             self.java_code.write(
 """

modules/java/src/cpp/utils.cpp

@@ -1,5 +1,9 @@
 #include <jni.h>
 
+#include "opencv2/core/core.hpp"
+
+#include <android/bitmap.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -9,44 +13,25 @@ extern "C" {
  * Method:    nBitmapToMat(Bitmap b)
  * Signature: (L)J
  */
-JNIEXPORT jlong JNICALL Java_org_opencv_utils_nBitmapToMat
-  (JNIEnv *, jclass, jobject);
-
-/*
- * Class:     org_opencv_utils
- * Method:    nBitmapToMat(long m, Bitmap b)
- * Signature: (JL)Z
- */
-JNIEXPORT jboolean JNICALL Java_org_opencv_utils_nMatToBitmap
-  (JNIEnv *, jclass, jlong, jobject);
-
-
-
-#ifdef __cplusplus
-}
-#endif
-
-#include "opencv2/core/core.hpp"
-
-#include <android/bitmap.h>
 
 JNIEXPORT jlong JNICALL Java_org_opencv_utils_nBitmapToMat
   (JNIEnv * env, jclass cls, jobject bitmap)
 {
     AndroidBitmapInfo  info;
     void*              pixels;
-	cv::Mat* m = NULL;
+    cv::Mat*           m = new cv::Mat();
 
 	if ( AndroidBitmap_getInfo(env, bitmap, &info) < 0 )
-        return 0; // can't get info
+        return (jlong)m; // can't get info
 
     if (info.format != ANDROID_BITMAP_FORMAT_RGBA_8888)
-        return 0; // incompatible format
+        return (jlong)m; // incompatible format
 
     if ( AndroidBitmap_lockPixels(env, bitmap, &pixels) < 0 )
-        return 0; // can't get pixels
+        return (jlong)m; // can't get pixels
 
-	m = new cv::Mat(info.height, info.width, CV_8UC4);
+    m->create(info.height, info.width, CV_8UC4);
+    if(m->data && pixels)
         memcpy(m->data, pixels, info.height * info.width * 4);
 
     AndroidBitmap_unlockPixels(env, bitmap);
@@ -54,6 +39,11 @@ JNIEXPORT jlong JNICALL Java_org_opencv_utils_nBitmapToMat
     return (jlong)m;
 }
 
+/*
+ * Class:     org_opencv_utils
+ * Method:    nBitmapToMat(long m, Bitmap b)
+ * Signature: (JL)Z
+ */
 JNIEXPORT jboolean JNICALL Java_org_opencv_utils_nMatToBitmap
   (JNIEnv * env, jclass cls, jlong m, jobject bitmap)
 {
@@ -61,7 +51,7 @@ JNIEXPORT jboolean JNICALL Java_org_opencv_utils_nMatToBitmap
     void*              pixels;
     cv::Mat* mat = (cv::Mat*) m;
 
-	if ( m == 0 )
+    if ( mat == 0 || mat->data == 0)
         return false; // no native Mat behind
 
     if ( AndroidBitmap_getInfo(env, bitmap, &info) < 0 )
@@ -73,9 +63,14 @@ JNIEXPORT jboolean JNICALL Java_org_opencv_utils_nMatToBitmap
     if ( AndroidBitmap_lockPixels(env, bitmap, &pixels) < 0 )
         return false; // can't get pixels
 
+    if(mat->data && pixels)
         memcpy(pixels, mat->data, info.height * info.width * 4);
 
     AndroidBitmap_unlockPixels(env, bitmap);
 
     return true;
 }
+
+#ifdef __cplusplus
+}
+#endif