more correct nanovg rendering

src/common/detail/nanovgcontext.cpp

@@ -46,12 +46,16 @@ void pop() {
 
 void NanoVGContext::begin() {
     push();
-    float w = v2d_.getVideoFrameSize().width;
-    float h = v2d_.getVideoFrameSize().height;
+    float w = v2d_.getFrameBufferSize().width;
+    float h = v2d_.getFrameBufferSize().height;
     float r = v2d_.getXPixelRatio();
 
     nvgSave(context_);
     nvgBeginFrame(context_, w, h, r);
+//FIXME mirroring with text somehow doesn't work
+//    nvgTranslate(context_, 0, h);
+//    nvgScale(context_, 1, -1);
+    GL_CHECK(glViewport(0, 0, w, h));
 }
 
 

src/common/viz2d.cpp

@@ -30,6 +30,7 @@ cv::Scalar color_convert(const cv::Scalar& src, cv::ColorConversionCodes code) {
     cv::Scalar dst(vdst[0],vdst[1],vdst[2], src[3]);
     return dst;
 }
+
 std::function<bool(Viz2DWindow*, Viz2DWindow*)> Viz2DWindow::viz2DWin_Xcomparator([](Viz2DWindow* lhs, Viz2DWindow* rhs){ return lhs->position()[0] < rhs->position()[0]; });
 std::set<Viz2DWindow*, decltype(Viz2DWindow::viz2DWin_Xcomparator)> Viz2DWindow::all_windows_xsorted_(viz2DWin_Xcomparator);
 
@@ -218,7 +219,7 @@ void Viz2D::initialize() {
     glfwSetMouseButtonCallback(getGLFWWindow(), [](GLFWwindow *glfwWin, int button, int action, int modifiers) {
         Viz2D* v2d = reinterpret_cast<Viz2D*>(glfwGetWindowUserPointer(glfwWin));
         v2d->screen().mouse_button_callback_event(button, action, modifiers);
-        if (button == GLFW_MOUSE_BUTTON_LEFT) {
+        if (button == GLFW_MOUSE_BUTTON_RIGHT) {
             v2d->setMouseDrag(action == GLFW_PRESS);
         }
     }

src/font/font-demo.cpp

@@ -94,7 +94,7 @@ int main(int argc, char **argv) {
         v2d->nanovg([&](const cv::Size& sz) {
             using namespace kb;
             v2d->clear();
-            nvg::beginPath();
+
             nvg::fontSize(FONT_SIZE);
             nvg::fontFace("libertine");
             nvg::fillColor(color_convert(cv::Scalar(0.15 * 180.0, 128, 255, 255), cv::COLOR_HLS2BGR));