/// <summary>
/// Constructs a new FonetImage using the supplied bitmap.
/// </summary>
/// <remarks>
/// Does not hold a reference to the passed bitmap. Instead the
/// image data is extracted from <b>bitmap</b> on construction.
/// </remarks>
/// <param name="href">The location of <i>bitmap</i></param>
/// <param name="imageData">The image data</param>
public FonetImage(string href, byte[] imageData)
{
this.m_href = href;
m_colorSpace = new ColorSpace(ColorSpace.DeviceRgb);
m_bitsPerPixel = DEFAULT_BITPLANES; // 8
// Bitmap does not seem to be thread-safe. The only situation
// Where this causes a problem is when the evaluation image is
// used. Each thread is given the same instance of Bitmap from
// the resource manager.
Bitmap bitmap = new Bitmap(new MemoryStream(imageData));
this.width = bitmap.Width;
this.height = bitmap.Height;
this.m_bitmaps = imageData;
ExtractImage(bitmap);
}
/// <summary>
/// Extracts the raw data from the image into a byte array suitable
/// for including in the PDF document. The image is always extracted
/// as a 24-bit RGB image, regardless of it's original colour space
/// and colour depth.
/// </summary>
/// <param name="bitmap">The <see cref="Bitmap"/> from which the data is extracted</param>
/// <returns>A byte array containing the raw 24-bit RGB data</returns>
private void ExtractImage(Bitmap bitmap)
{
// This should be a factory when we handle more image types
if (bitmap.RawFormat.Equals(ImageFormat.Jpeg))
{
JpegParser parser = new JpegParser(m_bitmaps);
JpegInfo info = parser.Parse();
m_bitsPerPixel = info.BitsPerSample;
m_colorSpace = new ColorSpace(info.ColourSpace);
width = info.Width;
height = info.Height;
// A "no-op" filter since the JPEG data is already compressed
filter = new DctFilter();
}
else
{
ExtractOtherImageBits(bitmap);
// Performs zip compression
filter = new FlateFilter();
}
}
