/// <summary>
/// Reads image in JPEG format and saves to BMP format using memory-friendly Pipeline API
/// </summary>
private static void WriteBmpMemoryFriendly()
{
using (var reader = new JpegReader("../../../../_Input/Chicago.jpg"))
using (var flip = new Flip(FlipType.Vertical))
using (var writer = new BmpWriter("../../../../_Output/WriteBmpMemoryFriendly.bmp"))
{
Pipeline.Run(reader + flip + writer);
}
}
/// <summary>
/// Reads image in BMP format, converts to palette-based pixel format and saves to BMP format with RLE compression
/// using memory-friendly Pipeline API
/// </summary>
private static void ReadConvertAndWriteBmpMemoryFriendly()
{
using (var reader = new BmpReader("../../../../_Output/WriteBmpMemoryFriendly.bmp"))
using (var colorConverter = new ColorConverter(PixelFormat.Format8bppIndexed))
using (var writer = new BmpWriter("../../../../_Output/ReadConvertAndWriteBmpMemoryFriendly.bmp"))
{
writer.Compression = CompressionType.Rle;
Pipeline.Run(reader + colorConverter + writer);
}
}
private GifFrame ReadImageData(BinaryReader reader)
{
var imageDescriptor = ImageDescriptor.Read(reader);
var localPalette = imageDescriptor.HasLocalPalette ? GifPalette.Read(reader, imageDescriptor.LocalPaletteColorCount) : null;
var lzwInitialCodeSize = reader.ReadByte() + 1;
var lzwBitReader = new GifLzwBitReader(new GifLzwByteReader(reader));
var lzwCodeSize = lzwInitialCodeSize;
var nextIncValue = (2 << (lzwCodeSize - 1)) - 1;
var decodeTable = new GifDecodeTable(_sreenDescriptor.GlobalPaletteColorCount);
int value;
#if SILVERLIGHT
var writeableBmp = new WriteableBitmap(_sreenDescriptor.Width, _sreenDescriptor.Height);
#else
var writeableBmp = new WriteableBitmap(_sreenDescriptor.Width, _sreenDescriptor.Height, 96.0, 96.0, PixelFormats.Bgra32, null);
#endif
var bmpWriter = new BmpWriter(writeableBmp, _globalPalette);
while (lzwBitReader.Read(lzwCodeSize, out value))
{
if (decodeTable.Count == nextIncValue)
{
lzwCodeSize++;
nextIncValue = (2 << (lzwCodeSize - 1)) - 1;
}
bool reset;
if (decodeTable.ProcessNextCode(value, bmpWriter, out reset) == false)
{
break;
}
if (reset)
{
lzwCodeSize = lzwInitialCodeSize;
nextIncValue = (2 << (lzwCodeSize - 1)) - 1;
}
if (lzwCodeSize > 12)
{
lzwCodeSize = 12;
}
}
bmpWriter.Flush();
return(new GifFrame(imageDescriptor, localPalette, writeableBmp));
}
