Change SVG DPI to 75, add in2px and mm2px convenience functions

include/gui.hpp

@@ -4,9 +4,6 @@
 #include <GLFW/glfw3.h>
 
 
-namespace rack {
-
-
 #ifdef ARCH_MAC
 	#define GUI_MOD_KEY_NAME "Cmd"
 #else
@@ -14,6 +11,8 @@ namespace rack {
 #endif
 
 
+namespace rack {
+
 
 extern GLFWwindow *gWindow;
 extern NVGcontext *gVg;
@@ -34,4 +33,5 @@ void guiCursorUnlock();
 bool guiIsModPressed();
 bool guiIsShiftPressed();
 
+
 } // namespace rack

include/rack.hpp

@@ -17,6 +17,16 @@ namespace rack {
 // helpers
 ////////////////////
 
+
+inline Vec in2px(Vec inches) {
+	return inches.mult(SVG_DPI);
+}
+
+inline Vec mm2px(Vec millimeters) {
+	return millimeters.mult(SVG_DPI / 25.4);
+}
+
+
 template <class TModuleWidget>
 Model *createModel(std::string manufacturerSlug, std::string manufacturerName, std::string slug, std::string name) {
 	struct TModel : Model {

include/widgets.hpp

@@ -10,6 +10,9 @@
 #include "util.hpp"
 
 
+#define SVG_DPI 75.0
+
+
 namespace rack {
 
 

src/gui.cpp

@@ -457,7 +457,7 @@ std::shared_ptr<Image> Image::load(const std::string &filename) {
 ////////////////////
 
 SVG::SVG(const std::string &filename) {
-	handle = nsvgParseFromFile(filename.c_str(), "px", 96.0);
+	handle = nsvgParseFromFile(filename.c_str(), "px", SVG_DPI);
 	if (handle) {
 		fprintf(stderr, "Loaded SVG %s\n", filename.c_str());
 	}