public void JpegFrameEncoderDecoderTest()
{
// Encode and decode a basic raster structure.
var colorModel = new ColorModel();
colorModel.ColorSpace = ColorSpace.YCbCr;
colorModel.Opaque = true;
byte[][][] originalRaster = GetRaster();
var image = new Image(colorModel, originalRaster);
var stream = new MemoryStream();
var ctx = new JpegFrameContext(50, height, width);
var encoder = new JpegFrameEncoder(image, stream, ctx);
encoder.Encode();
stream.Seek(0, SeekOrigin.Begin);
var decoder = new JpegFrameDecoder(stream, ctx);
byte[][][] decodedRaster = Image.GetRaster(width, height, 3);
decoder.Decode(decodedRaster);
// Check that the returned raster structure looks something like what we passed in.
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < width; j++)
{
for (int k = 0; k < height; k++)
{
// Tune this.
int diff = Math.Abs(decodedRaster[i][j][k] - originalRaster[i][j][k]);
Assert.IsTrue(diff < 5);
}
}
}
}
public JpegFrameContext GetJpegFrameContext(byte quality, BlockType blockType)
{
JpegFrameContext ctx = null;
switch (blockType)
{
case BlockType.Jpeg:
ctx = normalContexts[quality];
if (ctx == null)
{
ctx = new JpegFrameContext(quality, Height, Width, JpegQuantizationTable.K1Luminance, JpegQuantizationTable.K2Chrominance);
normalContexts[quality] = ctx;
}
break;
case BlockType.JpegDiff:
ctx = deltaContexts[quality];
if (ctx == null)
{
ctx = new JpegFrameContext(quality, Height, Width, JpegQuantizationTable.Delta, JpegQuantizationTable.Delta);
deltaContexts[quality] = ctx;
}
break;
}
return(ctx);
}
){kind=link}
public JpegFrameEncoder(Image image, Stream outStream, JpegFrameContext context)
: this(new DecodedJpeg(image), outStream, context) /* see overload */ }
){kind=link}
public JpegFrameDecoder(Stream input, JpegFrameContext context)
{
this.input = input;
this.context = context;
}