internal static void SaveAsPng(this BitmapInstanceImpl bitmap, string filepath)
{
// NOTE(adm244): looks like we won't be able to modify result png file structure...
// we need that to support tRNS chunk
//
//ImageCodecInfo encoder = GetEncoderInfo(System.Drawing.Imaging.ImageFormat.Png);
//EncoderParameters encoderParams = bitmap.Instance.GetEncoderParameterList(encoder.Clsid);
//
//bitmap.Instance.Save(filepath, encoder, encoderParams);
//PropertyItem indexTransparent = bitmap.Instance.GetPropertyItem(0x5104); // PropertyTagIndexTransparent
// NOTE(adm244): no luck, the GDI+ png support is busted, just read\write file yourself
// trick below is for gif image only...
//
//System.Reflection.ConstructorInfo propertyItemConstructor = typeof(PropertyItem).GetConstructor
// (System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic, null, Type.EmptyTypes, null);
//PropertyItem property = propertyItemConstructor.Invoke(null) as PropertyItem;
//
//property.Id = 0x5104; // PropertyTagIndexTransparent
//property.Type = 1; // array of bytes
//property.Len = 1;
//property.Value = new byte[] { 0 };
//
//bitmap.Instance.SetPropertyItem(property);
// NOTE(adm244): we could just modify a png file after it's been written
// and add tRNS chunk right before IEND (since we're not networking, order doesn't matter)
// but there'll be problems with loading it all back (source pixel format goes through a window)
// so it's EVEN MORE workarounds...
//
// a MUCH better solution is to just give up on GDI and implement our custom png reader\writer
// don't care if it'll be slow, full control is a top priority
bitmap.Instance.Save(filepath, ImageFormat.Png);
}
//internal static PixelFormat ReadPngPixelFormat(string filepath)
//{
// using (FileStream stream = new FileStream(filepath, FileMode.Open, FileAccess.Read))
// {
// using (BinaryReader reader = new BinaryReader(stream))
// {
// string signature = reader.ReadFixedString(PngSignature.Length);
// if (signature != PngSignature)
// throw new InvalidDataException($"Invalid png signature: {signature}");
//
// byte[] buffer = PngFindBlock(reader, "IHDR");
// if (buffer == null)
// return PixelFormat.Undefined;
//
// byte bpp = buffer[8];
// byte colorType = buffer[9];
//
// Debug.Assert(bpp == 8);
//
// switch (colorType)
// {
// // FIXME(adm244): png doesn't support 16-bit bitmaps...
// // well... pull the lever, stop the train
// // BAD times to be a programmer; a plumber has to deal with less shit
// //
// // Three options:
// // 1) Respect users experience and support 'png' and 'bmp mess' file formats
// // 2) Respect yourself and use 'tga'
// // 3) Blame everyone and cry
// // as you can see below there's no option 1, only 2 and 3
//
// case 2:
// return PixelFormat.Format24bppRgb;
// case 3:
// return PixelFormat.Format8bppIndexed;
// case 6:
// return PixelFormat.Format32bppArgb;
//
// default:
// throw new InvalidDataException();
// }
// }
// }
//}
//
//private static byte[] PngFindBlock(BinaryReader reader, string blockType)
//{
// while (!reader.EOF())
// {
// int length = reader.ReadInt32BE();
// string type = reader.ReadFixedString(sizeof(UInt32));
//
// if (type == "IEND")
// break;
//
// if (type == blockType)
// return reader.ReadBytes(length);
//
// reader.BaseStream.Seek(length + sizeof(UInt32), SeekOrigin.Current);
// }
//
// return null;
//}
//internal static ImageCodecInfo GetEncoderInfo(System.Drawing.Imaging.ImageFormat format)
//{
// ImageCodecInfo[] encoders = ImageCodecInfo.GetImageEncoders();
//
// for (int i = 0; i < encoders.Length; ++i)
// {
// if (encoders[i].FormatID == format.Guid)
// return encoders[i];
// }
//
// throw new NotSupportedException();
//}
internal static void SaveAsBmp(this BitmapInstanceImpl bitmap, string filepath)
{
bitmap.Instance.Save(filepath, ImageFormat.Bmp);
}