Moved anisotropic filtering to Image:setFilter(min, mag, anisotropy), added anisotropic filtering support to canvases and fonts

src/modules/graphics/Image.cpp

@@ -26,6 +26,7 @@ namespace graphics
 {
 
 Image::Filter Image::defaultFilter;
+float Image::defaultAnisotropy = 1.0f;
 
 Image::Filter::Filter()
 	: min(FILTER_LINEAR)
@@ -54,6 +55,16 @@ const Image::Filter &Image::getDefaultFilter()
 	return defaultFilter;
 }
 
+void Image::setDefaultAnisotropy(float anisotropy)
+{
+	defaultAnisotropy = anisotropy;
+}
+
+float Image::getDefaultAnisotropy()
+{
+	return defaultAnisotropy;
+}
+
 bool Image::getConstant(const char *in, FilterMode &out)
 {
 	return filterModes.find(in, out);