add fillHeight option to setBackgroundImage

ios/Classes/SwiftPolyvoxFilamentPlugin.swift

@@ -305,7 +305,11 @@ public class SwiftPolyvoxFilamentPlugin: NSObject, FlutterPlugin, FlutterTexture
             clear_background_image(viewer)
             result(true)
         case "setBackgroundImage":
-            set_background_image(viewer, call.arguments as! String)
+            let args = call.arguments as! [Any];
+            
+            let path = args[0] as! String
+            let fillHeight = args[1] as! Bool
+            set_background_image(viewer, path, fillHeight)
             result(true)
         case "setBackgroundImagePosition":
             let args = call.arguments as! [Any]

ios/include/FilamentViewer.hpp

@@ -78,7 +78,7 @@ namespace polyvox {
             Renderer* getRenderer();
 
             void setBackgroundColor(const float r, const float g, const float b, const float a);
-            void setBackgroundImage(const char* resourcePath);
+            void setBackgroundImage(const char* resourcePath, bool fillHeight);
             void clearBackgroundImage();
             void setBackgroundImagePosition(float x, float y, bool clamp);
             void setCameraExposure(float aperture, float shutterSpeed, float sensitivity);

ios/src/FilamentViewer.cpp

@@ -426,7 +426,7 @@ void FilamentViewer::clearBackgroundImage() {
   }
 }
 
-void FilamentViewer::setBackgroundImage(const char *resourcePath) {
+void FilamentViewer::setBackgroundImage(const char *resourcePath, bool fillHeight) {
 
   string resourcePathString(resourcePath);
 
@@ -440,7 +440,18 @@ void FilamentViewer::setBackgroundImage(const char *resourcePath) {
   // TODO - implement stretch/etc
   const Viewport& vp = _view->getViewport();
   Log("Image width %d height %d vp width %d height %d", _imageWidth, _imageHeight, vp.width, vp.height);
-  _imageScale = mat4f { float(vp.width) / float(_imageWidth) , 0.0f, 0.0f, 0.0f, 0.0f, float(vp.height) / float(_imageHeight), 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f };
+
+
+  float xScale = float(vp.width) / float(_imageWidth);
+  
+  float yScale;
+  if(fillHeight) {
+    yScale = 1.0f;
+  } else { 
+    yScale = float(vp.height) / float(_imageHeight);
+  }
+
+  _imageScale = mat4f { xScale , 0.0f, 0.0f, 0.0f, 0.0f, yScale , 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f };
 
   _imageMaterial->setDefaultParameter("transform", _imageScale);
   _imageMaterial->setDefaultParameter("image", _imageTexture, _imageSampler);

ios/src/PolyvoxFilamentApi.cpp

@@ -40,8 +40,8 @@ extern "C" {
       ((FilamentViewer*)viewer)->clearBackgroundImage();
   }
 
-  FLUTTER_PLUGIN_EXPORT void set_background_image(const void* const viewer, const char* path) {
-      ((FilamentViewer*)viewer)->setBackgroundImage(path);
+  FLUTTER_PLUGIN_EXPORT void set_background_image(const void* const viewer, const char* path, bool fillHeight) {
+      ((FilamentViewer*)viewer)->setBackgroundImage(path, fillHeight);
   }
 
   FLUTTER_PLUGIN_EXPORT void set_background_image_position(const void* const viewer, float x, float y, bool clamp) {

lib/filament_controller.dart

@@ -131,11 +131,11 @@ class FilamentController {
     await _channel.invokeMethod("clearBackgroundImage");
   }
 
-  Future setBackgroundImage(String path) async {
+  Future setBackgroundImage(String path, {bool fillHeight = false}) async {
     if (_viewer == null || _resizing) {
       throw Exception("No viewer available, ignoring");
     }
-    await _channel.invokeMethod("setBackgroundImage", path);
+    await _channel.invokeMethod("setBackgroundImage", [path, fillHeight]);
   }
 
   Future setBackgroundColor(Color color) async {