Add more warnings for out-of-memory

src/core/StelTexture.cpp

@@ -122,7 +122,10 @@ StelTexture::GLData StelTexture::imageToGLData(const QImage &image, const int de
 {
 	GLData ret = GLData();
 	if (image.isNull())
+	{
+		qCritical() << "Image is null";
 		return ret;
+	}
 	ret.data = convertToGLFormat(image, ret.format, ret.type, decimateBy, ret.width, ret.height);
 	return ret;
 }
@@ -134,7 +137,10 @@ StelTexture::GLData StelTexture::loadFromPath(const QString &path, const int dec
 {
 	try
 	{
-		return imageToGLData(QImage(path), decimateBy);
+		QImage img(path);
+		if (img.isNull())
+			throw std::bad_alloc();
+		return imageToGLData(img, decimateBy);
 	}
 	catch(std::bad_alloc& ex) //this catches out-of-memory errors from file conversion
 	{

src/core/modules/Landscape.cpp

@@ -550,6 +550,8 @@ void LandscapeOldStyle::load(const QSettings& landscapeIni, const QString& lands
 		// if that query is not going to be prevented by the polygon that already has been loaded at that point...
 		if ( (!horizonPolygon) && calibrated ) { // for uncalibrated landscapes the texture is currently never queried, so no need to store.
 			QImage *image = new QImage(texturePath);
+			if (image->isNull())
+				qWarning() << "Null image (out of memory!) in Landscape!";
 			sidesImages.append(image); // indices identical to those in sideTexs
 			memorySize+=(image->sizeInBytes());
 		}
@@ -1567,6 +1569,8 @@ void LandscapeFisheye::create(const QString _name, float _texturefov, const QStr
 	{
 		mapImage = new QImage(_maptex);
 		memorySize+=(mapImage->sizeInBytes());
+		if (mapImage->isNull())
+			qWarning() << "Null image in Landscape" << _name << "- cannot load" << _maptex;
 	}
 	mapTex = texMan.createTexture(_maptex, StelTexture::StelTextureParams(true));
 	memorySize+=mapTex->getGlSize();
@@ -1852,6 +1856,8 @@ void LandscapeSpherical::create(const QString _name, const QString& _maptex, con
 	{
 		mapImage = new QImage(_maptex);
 		memorySize+=(mapImage->sizeInBytes());
+		if (mapImage->isNull())
+			qWarning() << "Null image in Landscape" << _name << "- cannot load" << _maptex;
 	}
 
 	auto& gl = *QOpenGLContext::currentContext()->functions();