protected override void PullImageProperties()
{
PngHeader png = new PngHeader(Stream);
foreach (PngFile.Chunk chunk in png.Chunks)
{
if (chunk is PngFile.IhdrChunk)
{
PngFile.IhdrChunk ihdr = (PngFile.IhdrChunk)chunk;
Width = (int)ihdr.Width;
Height = (int)ihdr.Height;
Depth = ihdr.Depth;
bool hasAlpha = false;
string colorType = null;
switch (ihdr.Color)
{
case PngFile.ColorType.Gray:
colorType = "Greyscale";
hasAlpha = false;
break;
case PngFile.ColorType.Rgb:
colorType = "Truecolor";
hasAlpha = false;
break;
case PngFile.ColorType.Indexed:
colorType = "Indexed";
hasAlpha = false;
break;
case PngFile.ColorType.GrayAlpha:
colorType = "Greyscale";
hasAlpha = true;
break;
case PngFile.ColorType.RgbA:
colorType = "Truecolor";
hasAlpha = true;
break;
}
AddProperty(Beagle.Property.NewUnsearched("fixme:colortype", colorType));
AddProperty(Beagle.Property.NewBool("fixme:hasalpha", hasAlpha));
}
else if (chunk is PngFile.TextChunk)
{
ExtractTextProperty((PngFile.TextChunk)chunk);
}
}
Finished();
}
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);
}
}
}