private static void RotateOrientation(string original_path, RotateDirection direction)
{
using (FSpot.ImageFile img = FSpot.ImageFile.Create(original_path)) {
if (img is JpegFile)
{
FSpot.JpegFile jimg = img as FSpot.JpegFile;
PixbufOrientation orientation = direction == RotateDirection.Clockwise
? PixbufUtils.Rotate90(img.Orientation)
: PixbufUtils.Rotate270(img.Orientation);
jimg.SetOrientation(orientation);
jimg.SaveMetaData(original_path);
}
else if (img is PngFile)
{
PngFile png = img as PngFile;
bool supported = false;
//FIXME there isn't much png specific here except the check
//the pixbuf is an accurate representation of the real file
//by checking the depth. The check should be abstracted and
//this code made generic.
foreach (PngFile.Chunk c in png.Chunks)
{
PngFile.IhdrChunk ihdr = c as PngFile.IhdrChunk;
if (ihdr != null && ihdr.Depth == 8)
{
supported = true;
}
}
if (!supported)
{
throw new RotateException("Unable to rotate photo type", original_path);
}
string backup = ImageFile.TempPath(original_path);
using (Stream stream = File.Open(backup, FileMode.Truncate, FileAccess.Write)) {
using (Pixbuf pixbuf = img.Load()) {
PixbufOrientation fake = (direction == RotateDirection.Clockwise) ? PixbufOrientation.RightTop : PixbufOrientation.LeftBottom;
using (Pixbuf rotated = PixbufUtils.TransformOrientation(pixbuf, fake)) {
img.Save(rotated, stream);
}
}
}
File.Copy(backup, original_path, true);
File.Delete(backup);
}
else
{
throw new RotateException("Unable to rotate photo type", original_path);
}
}
}