add support for default image path in themes

THEMES.md

@@ -523,6 +523,8 @@ Can be created as an extra.
 	- Point around which the image will be rotated. Defaults to `0.5 0.5`.
 * `path` - type: PATH.
 	- Path to the image file.  Most common extensions are supported (including .jpg, .png, and unanimated .gif).
+* `default` - type: PATH.
+	- Path to default image file.  Default image will be displayed when selected game does not have an image.
 * `tile` - type: BOOLEAN.
 	- If true, the image will be tiled instead of stretched to fit its size.  Useful for backgrounds.
 * `color` - type: COLOR.

es-app/src/views/SystemView.cpp

@@ -42,15 +42,17 @@ void SystemView::populate()
 		e.object = *it;
 
 		// make logo
-		if(theme->getElement("system", "logo", "image"))
+		const ThemeData::ThemeElement* logoElem = theme->getElement("system", "logo", "image");
+		if(logoElem)
 		{
-			std::string path = theme->getElement("system", "logo", "image")->get<std::string>("path");
+			std::string path = logoElem->get<std::string>("path");
-
+			std::string defaultPath = logoElem->has("default") ? logoElem->get<std::string>("default") : "";
-			if(!path.empty() && ResourceManager::getInstance()->fileExists(path))
+			if((!path.empty() && ResourceManager::getInstance()->fileExists(path))
+			   || (!defaultPath.empty() && ResourceManager::getInstance()->fileExists(defaultPath)))
 			{
 				ImageComponent* logo = new ImageComponent(mWindow, false, false);
 				logo->setMaxSize(mCarousel.logoSize * mCarousel.logoScale);
-				logo->applyTheme((*it)->getTheme(), "system", "logo", ThemeFlags::PATH | ThemeFlags::COLOR);
+				logo->applyTheme(theme, "system", "logo", ThemeFlags::PATH | ThemeFlags::COLOR);
 
 				e.data.logo = std::shared_ptr<GuiComponent>(logo);
 			}

es-core/src/ThemeData.cpp

@@ -36,6 +36,7 @@ std::map< std::string, ElementMapType > ThemeData::sElementMap = boost::assign::
 	 	("rotation", FLOAT)
 		("rotationOrigin", NORMALIZED_PAIR)
 		("path", PATH)
+		("default", PATH)
 		("tile", BOOLEAN)
 		("color", COLOR)
 		("zIndex", FLOAT)))

es-core/src/components/ImageComponent.cpp

@@ -93,12 +93,22 @@ void ImageComponent::onSizeChanged()
 	updateVertices();
 }
 
+void ImageComponent::setDefaultImage(std::string path)
+{
+	mDefaultPath = path;
+}
+
 void ImageComponent::setImage(std::string path, bool tile)
 {
 	if(path.empty() || !ResourceManager::getInstance()->fileExists(path))
+	{
+		if(mDefaultPath.empty() || !ResourceManager::getInstance()->fileExists(mDefaultPath))
 			mTexture.reset();
 		else
+			mTexture = TextureResource::get(mDefaultPath, tile, mForceLoad, mDynamic);
+	} else {
 		mTexture = TextureResource::get(path, tile, mForceLoad, mDynamic);
+	}
 
 	resize();
 }
@@ -334,6 +344,10 @@ void ImageComponent::applyTheme(const std::shared_ptr<ThemeData>& theme, const s
 	if((properties & ORIGIN || (properties & POSITION && properties & ThemeFlags::SIZE)) && elem->has("origin"))
 		setOrigin(elem->get<Eigen::Vector2f>("origin"));
 
+	if(elem->has("default")) {
+		setDefaultImage(elem->get<std::string>("default"));
+	}
+
 	if(properties & PATH && elem->has("path"))
 	{
 		bool tile = (elem->has("tile") && elem->get<bool>("tile"));

es-core/src/components/ImageComponent.h

@@ -15,6 +15,8 @@ public:
 	ImageComponent(Window* window, bool forceLoad = false, bool dynamic = true);
 	virtual ~ImageComponent();
 
+	void setDefaultImage(std::string path);
+
 	//Loads the image at the given filepath. Will tile if tile is true (retrieves texture as tiling, creates vertices accordingly).
 	void setImage(std::string path, bool tile = false);
 	//Loads an image from memory.
@@ -77,6 +79,8 @@ private:
 
 	unsigned int mColorShift;
 
+	std::string mDefaultPath;
+
 	std::shared_ptr<TextureResource> mTexture;
 	unsigned char			 mFadeOpacity;
 	bool					 mFading;