refactor(#47): minor refactors, code normalization and test coverage

metadata.go

@@ -18,6 +18,7 @@ type ImageMetadata struct {
 	Profile     bool
 	Type        string
 	Space       string
+	Colourspace string
 	Size        ImageSize
 }
 
@@ -34,6 +35,17 @@ func Size(buf []byte) (ImageSize, error) {
 	}, nil
 }
 
+// Check in the image colourspace is supported by libvips
+func ColourspaceIsSupported(buf []byte) (bool, error) {
+	return vipsColourspaceIsSupportedBuffer(buf)
+}
+
+// Get the image interpretation type
+// See: http://www.vips.ecs.soton.ac.uk/supported/current/doc/html/libvips/VipsImage.html#VipsInterpretation
+func ImageInterpretation(buf []byte) (Interpretation, error) {
+	return vipsInterpretationBuffer(buf)
+}
+
 // Extract the image metadata (size, type, alpha channel, profile, EXIF orientation...)
 func Metadata(buf []byte) (ImageMetadata, error) {
 	defer C.vips_thread_shutdown()