Screencap.cs

Siirry tämän tiedoston dokumentaatioon.

using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
 
namespace Jypeli
{
    internal static class Screencap
    {
        public static void WriteBmp( Stream outStream, Jypeli.Image image )
        {
            // TODO: Kuva tulee ylösalaisin
            byte[] buffer = image.GetByteArray();
 
            BinaryWriter writer = new BinaryWriter(outStream);
            {
                // Magic
                writer.Write('B');
                writer.Write('M');
 
                // Size of the BMP file
                //writer.Write( (int)(54 + buffer.Length) );
                writer.Write((int)(122 + buffer.Length));
 
                // Unused
                writer.Write( (int)0 );
 
                // Offset of pixel array
                //writer.Write( (int)0x36 );
                writer.Write((int)0x7A);
 
                // DIB header length
                //writer.Write( (int)0x28 );
                writer.Write( (int)108 );
 
                // Image dimensions
                writer.Write( image.Width );
                writer.Write( image.Height );
 
                // Number of color planes
                writer.Write( (short)1 );
 
                // Bits per pixel
                writer.Write( (short)32 );
 
                // No compression, specify bitfields
                //writer.Write( (int)0 );
                writer.Write( (int)3 );
 
                // Size of raw bitmap data
                writer.Write( (int)buffer.Length );
 
                // Print resolution as pixels per meter (this is 72 dpi)
                writer.Write( (int)2835 );
                writer.Write( (int)2835 );
 
                // Number of colors in the palette
                writer.Write( (int)0 );
 
                // Number of important colors
                writer.Write( (int)0 );
 
                // Bit masks: red, green, blue, alpha (big endian)
                writer.Write( new byte[] { 0xFF, 0x00, 0x00, 0x00 } );
                writer.Write( new byte[] { 0x00, 0xFF, 0x00, 0x00 } );
                writer.Write( new byte[] { 0x00, 0x00, 0xFF, 0x00 } );
                writer.Write( new byte[] { 0x00, 0x00, 0x00, 0xFF } );
 
                // Color space: "Win"
                writer.Write(' ');
                writer.Write('n');
                writer.Write('i');
                writer.Write('W');
 
                // Unused (color space endpoints & gamma)
                writer.Write( new byte[36] );
                writer.Write( (int)0 );
                writer.Write( (int)0 );
                writer.Write( (int)0 );
 
                // Bitmap data
                writer.Write(buffer);
 
            }
 
            // Do not call Close or Dispose! It closes the stream too.
            writer.Flush();
        }
 
        public static void EncodePng(Stream outStream, Stream inStream)
        {
            var encoders = ImageCodecInfo.GetImageEncoders();
 
            Bitmap bmp = new Bitmap(inStream);
            bmp.Save(outStream, ImageFormat.Png);
        }
 
        public static void EncodeJpeg(Stream outStream, Stream inStream)
        {
            var bitmap = new Bitmap(inStream);
 
            ImageCodecInfo jpgEncoder = GetCodecByDescription("JPEG");
            Encoder encoder2 = System.Drawing.Imaging.Encoder.Quality;
            EncoderParameters parameters = new System.Drawing.Imaging.EncoderParameters(1);
            EncoderParameter parameter = new EncoderParameter(encoder2, 50L);
            parameters.Param[0] = parameter;
 
            //System.IO.Stream stream = new MemoryStream();
            //bitmap.Save(stream, jpgEncoder, parameters);
            bitmap.Save(outStream, jpgEncoder, parameters);
 
            /*var bytes = ((MemoryStream)stream).ToArray();
            System.IO.Stream inputStream = new MemoryStream(bytes);
            Bitmap fromDisk = new Bitmap(@"C:\Temp\TestJPEG.jpg");
            Bitmap fromStream = new Bitmap(inputStream);*/
        }
 
        public static void SaveJPG(string fname, Image img)
        {
            using (var image = System.Drawing.Image.FromStream(img.AsJpeg()))
            {
                image.Save(fname);
            }
        }
 
        private static ImageCodecInfo GetCodecByDescription( string desc )
        {
            foreach ( var codec in ImageCodecInfo.GetImageEncoders().FindAll(x => x.FormatDescription == "JPEG") )
            {
                return codec;
            }
 
            throw new IOException(desc + " codec not found");
        }
    }
}