/**
* Reuses an existing image.
* @param ref the reference to the image dictionary
* @throws BadElementException on error
* @return the image
*/
public static Image GetInstance(PRIndirectReference iref)
{
PdfDictionary dic = (PdfDictionary)PdfReader.GetPdfObjectRelease(iref);
int width = ((PdfNumber)PdfReader.GetPdfObjectRelease(dic.Get(PdfName.WIDTH))).IntValue;
int height = ((PdfNumber)PdfReader.GetPdfObjectRelease(dic.Get(PdfName.HEIGHT))).IntValue;
Image imask = null;
PdfObject obj = dic.Get(PdfName.SMASK);
if (obj != null && obj.IsIndirect()) {
imask = GetInstance((PRIndirectReference)obj);
}
else {
obj = dic.Get(PdfName.MASK);
if (obj != null && obj.IsIndirect()) {
PdfObject obj2 = PdfReader.GetPdfObjectRelease(obj);
if (obj2 is PdfDictionary)
imask = GetInstance((PRIndirectReference)obj);
}
}
Image img = new ImgRaw(width, height, 1, 1, null);
img.imageMask = imask;
img.directReference = iref;
return img;
}
/// <summary>
/// Gets an instance of an Image in raw mode.
/// </summary>
/// <param name="width">the width of the image in pixels</param>
/// <param name="height">the height of the image in pixels</param>
/// <param name="components">1,3 or 4 for GrayScale, RGB and CMYK</param>
/// <param name="bpc">bits per component</param>
/// <param name="data">the image data</param>
/// <param name="transparency">
/// transparency information in the Mask format of the
/// image dictionary
/// </param>
/// <returns>an object of type ImgRaw</returns>
public static Image GetInstance(int width, int height, int components, int bpc, byte[] data, int[] transparency)
{
if (transparency != null && transparency.Length != components * 2)
throw new BadElementException("Transparency length must be equal to (componentes * 2)");
if (components == 1 && bpc == 1) {
byte[] g4 = CCITTG4Encoder.Compress(data, width, height);
return Image.GetInstance(width, height, false, Element.CCITTG4, Element.CCITT_BLACKIS1, g4, transparency);
}
Image img = new ImgRaw(width, height, components, bpc, data);
img.transparency = transparency;
return img;
}
/**
* Reads next frame image
*/
protected void ReadImage()
{
ix = ReadShort(); // (sub)image position & size
iy = ReadShort();
iw = ReadShort();
ih = ReadShort();
int packed = inp.ReadByte();
lctFlag = (packed & 0x80) != 0; // 1 - local color table flag
interlace = (packed & 0x40) != 0; // 2 - interlace flag
// 3 - sort flag
// 4-5 - reserved
lctSize = 2 << (packed & 7); // 6-8 - local color table size
m_bpc = NewBpc(m_gbpc);
if (lctFlag) {
m_curr_table = ReadColorTable((packed & 7) + 1); // read table
m_bpc = NewBpc((packed & 7) + 1);
}
else {
m_curr_table = m_global_table;
}
if (transparency && transIndex >= m_curr_table.Length / 3)
transparency = false;
if (transparency && m_bpc == 1) { // Acrobat 5.05 doesn't like this combination
byte[] tp = new byte[12];
Array.Copy(m_curr_table, 0, tp, 0, 6);
m_curr_table = tp;
m_bpc = 2;
}
bool skipZero = DecodeImageData(); // decode pixel data
if (!skipZero)
Skip();
Image img = null;
img = new ImgRaw(iw, ih, 1, m_bpc, m_out);
PdfArray colorspace = new PdfArray();
colorspace.Add(PdfName.INDEXED);
colorspace.Add(PdfName.DEVICERGB);
int len = m_curr_table.Length;
colorspace.Add(new PdfNumber(len / 3 - 1));
colorspace.Add(new PdfString(m_curr_table));
PdfDictionary ad = new PdfDictionary();
ad.Put(PdfName.COLORSPACE, colorspace);
img.Additional = ad;
if (transparency) {
img.Transparency = new int[]{transIndex, transIndex};
}
img.OriginalType = Image.ORIGINAL_GIF;
img.OriginalData = fromData;
img.Url = fromUrl;
GifFrame gf = new GifFrame();
gf.image = img;
gf.ix = ix;
gf.iy = iy;
frames.Add(gf); // add image to frame list
//ResetFrame();
}