Java API generator improvements:

- fixed return of complex types (Scalar, Point, etc)
- partial implementation of vector<> support (empty stubs for CPP-side converters)

modules/java/gen_java.py

@@ -149,8 +149,8 @@ type_dict = {
  "RotatedRect": { "j_type" : "RotatedRect",  "jn_args" : (("double", ".center.x"), ("double", ".center.y"), ("double", ".size.width"), ("double", ".size.height"), ("double", ".angle")),
                   "jni_var" : "RotatedRect %(n)s(cv::Point2f(%(n)s_center_x, %(n)s_center_y), cv::Size2f(%(n)s_size_width, %(n)s_size_height), %(n)s_angle)",
                   "jni_type" : "jdoubleArray", "suffix" : "DDDDD"},
-    "Scalar"  : { "j_type" : "Scalar",  "jn_args" : (("double", ".v0"), ("double", ".v1"), ("double", ".v2"), ("double", ".v3")),
-                  "jni_var" : "Scalar %(n)s(%(n)s_v0, %(n)s_v1, %(n)s_v2, %(n)s_v3)", "jni_type" : "jdoubleArray",
+    "Scalar"  : { "j_type" : "Scalar",  "jn_args" : (("double", ".val[0]"), ("double", ".val[1]"), ("double", ".val[2]"), ("double", ".val[3]")),
+                  "jni_var" : "Scalar %(n)s(%(n)s_val0, %(n)s_val1, %(n)s_val2, %(n)s_val3)", "jni_type" : "jdoubleArray",
                   "suffix" : "DDDD"},
     "Range"   : { "j_type" : "Range",  "jn_args" : (("int", ".start"), ("int", ".end")),
                   "jni_var" : "Range %(n)s(%(n)s_start, %(n)s_end)", "jni_type" : "jdoubleArray",
@@ -489,6 +489,7 @@ class JavaWrapperGenerator(object):
 #define LOGD(...) ((void)__android_log_print(ANDROID_LOG_DEBUG, MODULE_LOG_TAG, __VA_ARGS__))
 #endif // DEBUG
 
+#include "utils.h"
 """ % module)
         self.cpp_code.write( "\n".join(['#include "opencv2/%s/%s"' % (module, os.path.basename(f)) \
                             for f in srcfiles]) )
@@ -649,8 +650,14 @@ JNIEXPORT jdoubleArray JNICALL Java_org_opencv_core_n_1minMaxLocManual
             c_prologue = []
             c_epilogue = []
             if type_dict[fi.ctype]["jni_type"] == "jdoubleArray":
-                c_epilogue.append( "jdoubleArray _da_ = env->NewDoubleArray(6); /* assuming '6' is enough*/  //" +
-                                   fi.ctype + "_to_doubles(_retval_, _da_);" )
+                fields = type_dict[fi.ctype].get("jn_args")
+                if fields:
+                    c_epilogue.append( \
+                        "jdoubleArray _da_retval_ = env->NewDoubleArray(6); /* assuming '6' is enough*/  " +
+                        "jdouble _tmp_retval_[%(cnt)i] = {%(args)s}; env->SetDoubleArrayRegion(_da_retval_, 0, %(cnt)i, _tmp_retval_);" %
+                        { "cnt" : len(fields), "args" : ", ".join(["_retval_" + f[1] for f in fields]) } )
+                else:
+                    c_epilogue.append( "/* TODO: NYI !!! */" )
             if fi.classname and fi.ctype and not fi.static: # non-static class method except c-tor
                 # adding 'self'
                 jn_args.append ( ArgInfo([ "__int64", "nativeObj", "", [], "" ]) )
@@ -663,21 +670,22 @@ JNIEXPORT jdoubleArray JNICALL Java_org_opencv_core_n_1minMaxLocManual
                     jn_args.append  ( ArgInfo([ "__int64", "%s_mat.nativeObj" % a.name, "", [], "" ]) )
                     jni_args.append ( ArgInfo([ "__int64", "%s_mat_nativeObj" % a.name, "", [], "" ]) )
                     c_prologue.append( type_dict[a.ctype]["jni_var"] % {"n" : a.name} + ";" )
+                    c_prologue.append( "Mat& %(n)s_mat = *((Mat*)%(n)s_mat_nativeObj)" % {"n" : a.name} + ";" )
                     if "I" in a.out or not a.out:
-                        j_prologue.append( "Mat %s_mat = utils.%s_to_Mat(%s);" % (a.name, a.ctype, a.name) )
-                        c_prologue.append( "// %s_out -> %s" % (a.name, a.name) )
+                        j_prologue.append( "Mat %(n)s_mat = utils.%(t)s_to_Mat(%(n)s);" % {"n" : a.name, "t" : a.ctype} )
+                        c_prologue.append( "Mat_to_%(t)s( %(n)s_mat, %(n)s );" % {"n" : a.name, "t" : a.ctype} )
                     else:
                         j_prologue.append( "Mat %s_mat = new Mat();" % a.name )
                     if "O" in a.out:
-                        j_epilogue.append("utils.Mat_to_%s(%s_mat, %s);" % (a.ctype, a.name, a.name))
-                        c_epilogue.append( "// %s -> %s_out" % (a.name, a.name) )
+                        j_epilogue.append("utils.Mat_to_%(t)s(%(n)s_mat, %(n)s);" % {"t" : a.ctype, "n" : a.name})
+                        c_prologue.append( "%(t)s_to_Mat( %(n)s, %(n)s_mat );" % {"n" : a.name, "t" : a.ctype} )
                 else:
 
                     fields = type_dict[a.ctype].get("jn_args")
                     if fields: # complex type
                         for f in fields:
                             jn_args.append ( ArgInfo([ f[0], a.name + f[1], "", [], "" ]) )
-                            jni_args.append( ArgInfo([ f[0], a.name + f[1].replace(".","_"), "", [], "" ]) )
+                            jni_args.append( ArgInfo([ f[0], a.name + f[1].replace(".","_").replace("[","").replace("]",""), "", [], "" ]) )
                     else:
                         jn_args.append(a)
                         jni_args.append(a)
@@ -695,7 +703,7 @@ JNIEXPORT jdoubleArray JNICALL Java_org_opencv_core_n_1minMaxLocManual
                                 "jdouble tmp_%(n)s[%(cnt)i] = {%(args)s}; env->SetDoubleArrayRegion(%(n)s_out, 0, %(cnt)i, tmp_%(n)s);" %
                                 { "n" : a.name, "cnt" : len(fields), "args" : ", ".join([a.name + f[1] for f in fields]) } )
                         else:
-                            j_epilogue.append("/* NYI: %s.set(%s_out); */" % (a.name, a.name))
+                            j_epilogue.append("/* TODO: NYI: %s.set(%s_out); */" % (a.name, a.name))
                             c_epilogue.append( \
                                 "jdouble tmp_%(n)s[1] = {%(n)s}; env->SetDoubleArrayRegion(%(n)s_out, 0, 1, tmp_%(n)s);" %
                                 { "n" : a.name } )
@@ -710,7 +718,7 @@ JNIEXPORT jdoubleArray JNICALL Java_org_opencv_core_n_1minMaxLocManual
                 indent = indent, \
                 jn_type = type_dict[fi.ctype].get("jn_type", "double[]"), \
                 jn_name = fi.jn_name, \
-                jn_args = ", ".join(["%s %s" % (type_dict[a.ctype]["jn_type"], a.name.replace(".","_")) for a in jn_args])
+                jn_args = ", ".join(["%s %s" % (type_dict[a.ctype]["jn_type"], a.name.replace(".","_").replace("[","").replace("]","")) for a in jn_args])
             ) );
 
             # java part:
@@ -788,7 +796,7 @@ $indent}
             elif fi.ctype in self.classes: # wrapped class:
                 ret = "return (jlong) new %s(_retval_);" % fi.ctype
             elif type_dict[fi.ctype]["jni_type"] == "jdoubleArray":
-                ret = "return _da_;"
+                ret = "return _da_retval_;"
 
             cvname = "cv::" + fi.name
             #j2cvargs = []

modules/java/src/cpp/utils.cpp

 #include "utils.h"
 
-using namespace cv;
\ No newline at end of file
+using namespace cv;
+
+// vector_int
+
+void Mat_to_vector_int(Mat& mat, vector<int>& v_int)
+{
+    return;
+}
+
+void vector_int_to_Mat(vector<int>& v_int, Mat& mat)
+{
+    return;
+}
+
+
+//vector_double
+
+void Mat_to_vector_double(Mat& mat, vector<double>& v_double)
+{
+    return;
+}
+
+void vector_double_to_Mat(vector<double>& v_double, Mat& mat)
+{
+    return;
+}
+
+
+// vector_float
+
+void Mat_to_vector_float(Mat& mat, vector<float>& v_float)
+{
+    return;
+}
+
+void vector_float_to_Mat(vector<float>& v_float, Mat& mat)
+{
+    return;
+}
+
+
+//vector_uchar
+
+void Mat_to_vector_uchar(cv::Mat& mat, std::vector<uchar>& v_uchar)
+{
+    return;
+}
+
+
+//vector_Rect
+
+void Mat_to_vector_Rect(Mat& mat, vector<Rect>& v_rect)
+{
+    return;
+}
+
+void vector_Rect_to_Mat(vector<Rect>& v_rect, Mat& mat)
+{
+    return;
+}
+
+
+//vector_Point
+void Mat_to_vector_Point(Mat& mat, vector<Point>& v_point)
+{
+    return;
+}
+
+
+void vector_Point_to_Mat(vector<Point>& v_point, Mat& mat)
+{
+    return;
+}
+
+
+//vector_KeyPoint
+void Mat_to_vector_KeyPoint(Mat& mat, vector<KeyPoint>& v_kp)
+{
+    return;
+}
+
+
+void vector_KeyPoint_to_Mat(vector<KeyPoint>& v_kp, Mat& mat)
+{
+    return;
+}
+
+
+//vector_Mat
+void Mat_to_vector_Mat(cv::Mat& mat, std::vector<cv::Mat>& v_mat)
+{
+    return;
+}
+
+
+void vector_Mat_to_Mat(std::vector<cv::Mat>& v_mat, cv::Mat& mat)
+{
+    return;
+}
+

modules/java/src/cpp/utils.h

 #include <jni.h>
 
 #include "opencv2/core/core.hpp"
+#include "opencv2/features2d/features2d.hpp"
+
+
+void Mat_to_vector_int(cv::Mat& mat, std::vector<int>& v_int);
+
+void vector_int_to_Mat(std::vector<int>& v_int, cv::Mat& mat);
+
+
+void Mat_to_vector_double(cv::Mat& mat, std::vector<double>& v_double);
+
+void vector_double_to_Mat(std::vector<double>& v_double, cv::Mat& mat);
+
+
+void Mat_to_vector_float(cv::Mat& mat, std::vector<float>& v_float);
+
+void vector_float_to_Mat(std::vector<float>& v_float, cv::Mat& mat);
+
+
+void Mat_to_vector_uchar(cv::Mat& mat, std::vector<uchar>& v_uchar);
+
+
+void Mat_to_vector_Rect(cv::Mat& mat, std::vector<cv::Rect>& v_rect);
+
+void vector_Rect_to_Mat(std::vector<cv::Rect>& v_rect, cv::Mat& mat);
+
+
+void Mat_to_vector_Point(cv::Mat& mat, std::vector<cv::Point>& v_point);
+
+void vector_Point_to_Mat(std::vector<cv::Point>& v_point, cv::Mat& mat);
+
+
+void Mat_to_vector_KeyPoint(cv::Mat& mat, std::vector<cv::KeyPoint>& v_kp);
+
+void vector_KeyPoint_to_Mat(std::vector<cv::KeyPoint>& v_kp, cv::Mat& mat);
+
+void Mat_to_vector_Mat(cv::Mat& mat, std::vector<cv::Mat>& v_mat);
+
+void vector_Mat_to_Mat(std::vector<cv::Mat>& v_mat, cv::Mat& mat);
+

modules/java/src/java/Mat.java

@@ -27,7 +27,7 @@ public class Mat {
 
     //javadoc:Mat::Mat(rows,cols,type,s)
     public Mat(int rows, int cols, CvType type, Scalar s) {
-        this( nCreateMat(rows, cols, type.toInt(), s.v0, s.v1, s.v2, s.v3) );
+        this( nCreateMat(rows, cols, type.toInt(), s.val[0], s.val[1], s.val[2], s.val[3]) );
     }
 
     //javadoc:Mat::Mat(rows,cols,depth,s)
@@ -280,7 +280,7 @@ public class Mat {
     //javadoc:Mat::setTo(s)
     public void setTo(Scalar s) {
         checkNull();
-        nSetTo(nativeObj, s.v0, s.v1, s.v2, s.v3);
+        nSetTo(nativeObj, s.val[0], s.val[1], s.val[2], s.val[3]);
     }
     
     //javadoc:Mat::copyTo(m)

modules/java/src/java/Scalar.java

@@ -3,41 +3,34 @@ package org.opencv;
 //javadoc:Scalar_
 public class Scalar {
 
-    public double v0, v1, v2, v3;
+    public double val[];
 
     public Scalar(double v0, double v1, double v2, double v3) {
-        this.v0 = v0;
-        this.v1 = v1;
-        this.v2 = v2;
-        this.v3 = v3;
+    	this.val = new double[] {v0, v1, v2, v3};
     }
 
     public Scalar(double v0, double v1, double v2) {
-        this(v0, v1, v2, 0);
+    	this.val = new double[] {v0, v1, v2, 0};
     }
 
     public Scalar(double v0, double v1) {
-        this(v0, v1, 0, 0);
+    	this.val = new double[] {v0, v1, 0, 0};
     }
 
     public Scalar(double v0) {
-        this(v0, 0, 0, 0);
+    	this.val = new double[] {v0, 0, 0, 0};
     }
 
     public Scalar(double[] vals) {
-        set(vals);
+    	this.val = new double[4];
+    	set(vals);
     }
     public void set(double[] vals) {
         if(vals!=null) {
-            v0 = vals.length>0 ? (int)vals[0] : 0;
-            v1 = vals.length>1 ? (int)vals[1] : 0;
-            v2 = vals.length>2 ? (int)vals[2] : 0;
-            v3 = vals.length>3 ? (int)vals[3] : 0;
-        } else {
-            v0 = 0;
-            v1 = 0;
-            v2 = 0;
-            v3 = 0;
+            this.val[0] = vals.length>0 ? vals[0] : 0;
+            this.val[1] = vals.length>1 ? vals[1] : 0;
+            this.val[2] = vals.length>2 ? vals[2] : 0;
+            this.val[3] = vals.length>3 ? vals[3] : 0;
         }
     }
 
@@ -46,46 +39,41 @@ public class Scalar {
     }
 
     public Scalar clone() {
-        return new Scalar(v0, v1, v2, v3);
+        return new Scalar(val);
     }
 
     public Scalar mul(Scalar it, double scale) {
-        return new Scalar( v0 * it.v0 * scale, v1 * it.v1 * scale,
-                           v2 * it.v2 * scale, v3 * it.v3 * scale );
+        return new Scalar( val[0] * it.val[0] * scale, val[1] * it.val[1] * scale,
+                           val[2] * it.val[2] * scale, val[3] * it.val[3] * scale );
     }
 
     public Scalar mul(Scalar it) {
         return mul(it, 1);
     }
     public Scalar conj() {
-        return new Scalar(v0, -v1, -v2, -v3);
+        return new Scalar(val[0], -val[1], -val[2], -val[3]);
     }
 
     public boolean isReal() {
-        return v1 == 0 && v2 == 0 && v3 == 0;
+        return val[1] == 0 && val[2] == 0 && val[3] == 0;
     }
 
-    @Override
-    public int hashCode() {
-        final int prime = 31;
-        int result = 1;
-        long temp;
-        temp = Double.doubleToLongBits(v0);
-        result = prime * result + (int) (temp ^ (temp >>> 32));
-        temp = Double.doubleToLongBits(v1);
-        result = prime * result + (int) (temp ^ (temp >>> 32));
-        temp = Double.doubleToLongBits(v2);
-        result = prime * result + (int) (temp ^ (temp >>> 32));
-        temp = Double.doubleToLongBits(v3);
-        result = prime * result + (int) (temp ^ (temp >>> 32));
-        return result;
-    }
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + java.util.Arrays.hashCode(val);
+		return result;
+	}
 
-    @Override
-    public boolean equals(Object obj) {
-        if (this == obj) return true;
-        if (!(obj instanceof Scalar)) return false;
-        Scalar it = (Scalar) obj;
-        return v0 == it.v0 && v1 == it.v1 && v2 == it.v2 && v3 == it.v3;
-    }
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) return true;
+		if (!(obj instanceof Scalar)) return false;
+		Scalar it = (Scalar) obj;
+		if (!java.util.Arrays.equals(val, it.val)) return false;
+		return true;
+	}
+
+   
 }