add missing functions to the nvg wrapper

modules/v4d/include/opencv2/v4d/nvg.hpp

@@ -143,6 +143,13 @@ public:
     float degToRad(float deg);
     float radToDeg(float rad);
 
+    int createImage(const char* filename, int imageFlags);
+    int createImageMem(int imageFlags, unsigned char* data, int ndata);
+    int createImageRGBA(int w, int h, int imageFlags, const unsigned char* data);
+    void updateImage(int image, const unsigned char* data);
+    void imageSize(int image, int* w, int* h);
+    void deleteImage(int image);
+
     void beginPath();
     void moveTo(float x, float y);
     void lineTo(float x, float y);
@@ -388,6 +395,13 @@ CV_EXPORTS float degToRad(float deg);
  */
 CV_EXPORTS float radToDeg(float rad);
 
+CV_EXPORTS int createImage(const char* filename, int imageFlags);
+CV_EXPORTS int createImageMem(int imageFlags, unsigned char* data, int ndata);
+CV_EXPORTS int createImageRGBA(int w, int h, int imageFlags, const unsigned char* data);
+CV_EXPORTS void updateImage(int image, const unsigned char* data);
+CV_EXPORTS void imageSize(int image, int* w, int* h);
+CV_EXPORTS void deleteImage(int image);
+
 /*!
  * A forward to nvgBeginPath. See https://github.com/memononen/nanovg/blob/master/src/nanovg.h
  */

modules/v4d/src/nvg.cpp

@@ -238,6 +238,30 @@ float NVG::radToDeg(float rad) {
     return nvgRadToDeg(rad);
 }
 
+int NVG::createImage(const char* filename, int imageFlags) {
+    return nvgCreateImage(getContext(), filename, imageFlags);
+}
+
+int NVG::createImageMem(int imageFlags, unsigned char* data, int ndata) {
+    return nvgCreateImageMem(getContext(), imageFlags, data, ndata);
+}
+
+int NVG::createImageRGBA(int w, int h, int imageFlags, const unsigned char* data) {
+    return nvgCreateImageRGBA(getContext(), w, h, imageFlags, data);
+}
+
+void NVG::updateImage(int image, const unsigned char* data) {
+    nvgUpdateImage(getContext(), image, data);
+}
+
+void NVG::imageSize(int image, int* w, int* h) {
+    nvgImageSize(getContext(), image, w, h);
+}
+
+void NVG::deleteImage(int image) {
+    nvgDeleteImage(getContext(), image);
+}
+
 void NVG::beginPath() {
     nvgBeginPath(getContext());
 }
@@ -559,6 +583,30 @@ float radToDeg(float rad) {
     return detail::NVG::getCurrentContext()->radToDeg(rad);
 }
 
+int createImage(const char* filename, int imageFlags) {
+    return detail::NVG::getCurrentContext()->createImage(filename, imageFlags);
+}
+
+int createImageMem(int imageFlags, unsigned char* data, int ndata) {
+    return detail::NVG::getCurrentContext()->createImageMem(imageFlags, data, ndata);
+}
+
+int createImageRGBA(int w, int h, int imageFlags, const unsigned char* data) {
+    return detail::NVG::getCurrentContext()->createImageRGBA(w, h, imageFlags, data);
+}
+
+void updateImage(int image, const unsigned char* data) {
+    detail::NVG::getCurrentContext()->updateImage(image, data);
+}
+
+void imageSize(int image, int* w, int* h) {
+    detail::NVG::getCurrentContext()->imageSize(image, w, h);
+}
+
+void deleteImage(int image) {
+    detail::NVG::getCurrentContext()->deleteImage(image);
+}
+
 void beginPath() {
     detail::NVG::getCurrentContext()->beginPath();
 }