/* BITMAPINFOHEADER struct and byte offsets:
* typedef struct tagBITMAPINFOHEADER{
* DWORD biSize; // 14
* LONG biWidth; // 18
* LONG biHeight; // 22
* WORD biPlanes; // 26
* WORD biBitCount; // 28
* DWORD biCompression; // 30
* DWORD biSizeImage; // 34
* LONG biXPelsPerMeter; // 38
* LONG biYPelsPerMeter; // 42
* DWORD biClrUsed; // 46
* DWORD biClrImportant; // 50
* } BITMAPINFOHEADER, *PBITMAPINFOHEADER;
*/
private void ReadIndexedMemoryBitmap(int bits /*, ref bool hasAlpha*/)
{
int pdfVersion = Owner.Version;
int firstMaskColor = -1, lastMaskColor = -1;
bool segmentedColorMask = false;
MemoryStream memory = new MemoryStream();
// THHO4THHO Use ImageImporterBMP here to avoid redundant code.
int streamLength = (int)memory.Length;
Debug.Assert(streamLength > 0, "Bitmap image encoding failed.");
if (streamLength > 0)
{
byte[] imageBits = new byte[streamLength];
memory.Seek(0, SeekOrigin.Begin);
memory.Read(imageBits, 0, streamLength);
memory.Dispose();
int height = _image.PixelHeight;
int width = _image.PixelWidth;
if (ReadWord(imageBits, 0) != 0x4d42 || // "BM"
ReadDWord(imageBits, 2) != streamLength ||
ReadDWord(imageBits, 14) != 40 || // sizeof BITMAPINFOHEADER
ReadDWord(imageBits, 18) != width ||
ReadDWord(imageBits, 22) != height)
{
throw new NotImplementedException("ReadIndexedMemoryBitmap: unsupported format");
}
int fileBits = ReadWord(imageBits, 28);
if (fileBits != bits)
{
if (fileBits == 1 || fileBits == 4 || fileBits == 8)
{
bits = fileBits;
}
}
if (ReadWord(imageBits, 26) != 1 ||
ReadWord(imageBits, 28) != bits ||
ReadDWord(imageBits, 30) != 0)
{
throw new NotImplementedException("ReadIndexedMemoryBitmap: unsupported format #2");
}
int bytesFileOffset = ReadDWord(imageBits, 10);
const int bytesColorPaletteOffset = 0x36; // GDI+ always returns Windows bitmaps: sizeof BITMAPFILEHEADER + sizeof BITMAPINFOHEADER
int paletteColors = ReadDWord(imageBits, 46);
if ((bytesFileOffset - bytesColorPaletteOffset) / 4 != paletteColors)
{
throw new NotImplementedException("ReadIndexedMemoryBitmap: unsupported format #3");
}
MonochromeMask mask = new MonochromeMask(width, height);
bool isGray = bits == 8 && (paletteColors == 256 || paletteColors == 0);
int isBitonal = 0; // 0: false; >0: true; <0: true (inverted)
byte[] paletteData = new byte[3 * paletteColors];
for (int color = 0; color < paletteColors; ++color)
{
paletteData[3 * color] = imageBits[bytesColorPaletteOffset + 4 * color + 2];
paletteData[3 * color + 1] = imageBits[bytesColorPaletteOffset + 4 * color + 1];
paletteData[3 * color + 2] = imageBits[bytesColorPaletteOffset + 4 * color + 0];
if (isGray)
{
isGray = paletteData[3 * color] == paletteData[3 * color + 1] &&
paletteData[3 * color] == paletteData[3 * color + 2];
}
if (imageBits[bytesColorPaletteOffset + 4 * color + 3] < 128)
{
// We treat this as transparency:
if (firstMaskColor == -1)
{
firstMaskColor = color;
}
if (lastMaskColor == -1 || lastMaskColor == color - 1)
{
lastMaskColor = color;
}
if (lastMaskColor != color)
{
segmentedColorMask = true;
}
}
//else
//{
// // We treat this as opacity:
//}
}
if (bits == 1)
{
if (paletteColors == 0)
{
isBitonal = 1;
}
if (paletteColors == 2)
{
if (paletteData[0] == 0 &&
paletteData[1] == 0 &&
paletteData[2] == 0 &&
paletteData[3] == 255 &&
paletteData[4] == 255 &&
paletteData[5] == 255)
{
isBitonal = 1; // Black on white
}
if (paletteData[5] == 0 &&
paletteData[4] == 0 &&
paletteData[3] == 0 &&
paletteData[2] == 255 &&
paletteData[1] == 255 &&
paletteData[0] == 255)
{
isBitonal = -1; // White on black
}
}
}
// NYI: (no sample found where this was required)
// if (segmentedColorMask = true)
// { ... }
bool isFaxEncoding = false;
byte[] imageData = new byte[((width * bits + 7) / 8) * height];
byte[] imageDataFax = null;
int k = 0;
if (bits == 1)
{
// TODO: flag/option?
// We try Group 3 1D and Group 4 (2D) encoding here and keep the smaller byte array.
//byte[] temp = new byte[imageData.Length];
//int ccittSize = DoFaxEncoding(ref temp, imageBits, (uint)bytesFileOffset, (uint)width, (uint)height);
// It seems that Group 3 2D encoding never beats both other encodings, therefore we don't call it here.
//byte[] temp2D = new byte[imageData.Length];
//uint dpiY = (uint)image.VerticalResolution;
//uint kTmp = 0;
//int ccittSize2D = DoFaxEncoding2D((uint)bytesFileOffset, ref temp2D, imageBits, (uint)width, (uint)height, dpiY, out kTmp);
//k = (int) kTmp;
byte[] tempG4 = new byte[imageData.Length];
int ccittSizeG4 = DoFaxEncodingGroup4(ref tempG4, imageBits, (uint)bytesFileOffset, (uint)width, (uint)height);
isFaxEncoding = /*ccittSize > 0 ||*/ ccittSizeG4 > 0;
if (isFaxEncoding)
{
//if (ccittSize == 0)
// ccittSize = 0x7fffffff;
if (ccittSizeG4 == 0)
{
ccittSizeG4 = 0x7fffffff;
}
//if (ccittSize <= ccittSizeG4)
//{
// Array.Resize(ref temp, ccittSize);
// imageDataFax = temp;
// k = 0;
//}
//else
{
Array.Resize(ref tempG4, ccittSizeG4);
imageDataFax = tempG4;
k = -1;
}
}
}
//if (!isFaxEncoding)
{
int bytesOffsetRead = 0;
if (bits == 8 || bits == 4 || bits == 1)
{
int bytesPerLine = (width * bits + 7) / 8;
for (int y = 0; y < height; ++y)
{
mask.StartLine(y);
int bytesOffsetWrite = (height - 1 - y) * ((width * bits + 7) / 8);
for (int x = 0; x < bytesPerLine; ++x)
{
if (isGray)
{
// Lookup the gray value from the palette:
imageData[bytesOffsetWrite] = paletteData[3 * imageBits[bytesFileOffset + bytesOffsetRead]];
}
else
{
// Store the palette index.
imageData[bytesOffsetWrite] = imageBits[bytesFileOffset + bytesOffsetRead];
}
if (firstMaskColor != -1)
{
int n = imageBits[bytesFileOffset + bytesOffsetRead];
if (bits == 8)
{
// TODO???: segmentedColorMask == true => bad mask NYI
mask.AddPel((n >= firstMaskColor) && (n <= lastMaskColor));
}
else if (bits == 4)
{
// TODO???: segmentedColorMask == true => bad mask NYI
int n1 = (n & 0xf0) / 16;
int n2 = (n & 0x0f);
mask.AddPel((n1 >= firstMaskColor) && (n1 <= lastMaskColor));
mask.AddPel((n2 >= firstMaskColor) && (n2 <= lastMaskColor));
}
else if (bits == 1)
{
// TODO???: segmentedColorMask == true => bad mask NYI
for (int bit = 1; bit <= 8; ++bit)
{
int n1 = (n & 0x80) / 128;
mask.AddPel((n1 >= firstMaskColor) && (n1 <= lastMaskColor));
n *= 2;
}
}
}
bytesOffsetRead += 1;
bytesOffsetWrite += 1;
}
bytesOffsetRead = 4 * ((bytesOffsetRead + 3) / 4); // Align to 32 bit boundary
}
}
else
{
throw new NotImplementedException("ReadIndexedMemoryBitmap: unsupported format #3");
}
}
FlateDecode fd = new FlateDecode();
if (firstMaskColor != -1 &&
lastMaskColor != -1)
{
// Color mask requires Reader 4.0 or higher:
//if (!segmentedColorMask && pdfVersion >= 13)
if (!segmentedColorMask && pdfVersion >= 13 && !isGray)
{
PdfArray array = new PdfArray(_document);
array.Elements.Add(new PdfInteger(firstMaskColor));
array.Elements.Add(new PdfInteger(lastMaskColor));
Elements[Keys.Mask] = array;
}
else
{
// Monochrome mask
byte[] maskDataCompressed = fd.Encode(mask.MaskData, _document.Options.FlateEncodeMode);
PdfDictionary pdfMask = new PdfDictionary(_document);
pdfMask.Elements.SetName(Keys.Type, "/XObject");
pdfMask.Elements.SetName(Keys.Subtype, "/Image");
Owner._irefTable.Add(pdfMask);
pdfMask.Stream = new PdfStream(maskDataCompressed, pdfMask);
pdfMask.Elements[PdfStream.Keys.Length] = new PdfInteger(maskDataCompressed.Length);
pdfMask.Elements[PdfStream.Keys.Filter] = new PdfName("/FlateDecode");
pdfMask.Elements[Keys.Width] = new PdfInteger(width);
pdfMask.Elements[Keys.Height] = new PdfInteger(height);
pdfMask.Elements[Keys.BitsPerComponent] = new PdfInteger(1);
pdfMask.Elements[Keys.ImageMask] = new PdfBoolean(true);
Elements[Keys.Mask] = pdfMask.Reference;
}
}
byte[] imageDataCompressed = fd.Encode(imageData, _document.Options.FlateEncodeMode);
byte[] imageDataFaxCompressed = isFaxEncoding ? fd.Encode(imageDataFax, _document.Options.FlateEncodeMode) : null;
bool usesCcittEncoding = false;
if (isFaxEncoding &&
(imageDataFax.Length < imageDataCompressed.Length ||
imageDataFaxCompressed.Length < imageDataCompressed.Length))
{
// /CCITTFaxDecode creates the smaller file (with or without /FlateDecode):
usesCcittEncoding = true;
if (imageDataFax.Length < imageDataCompressed.Length)
{
Stream = new PdfStream(imageDataFax, this);
Elements[PdfStream.Keys.Length] = new PdfInteger(imageDataFax.Length);
Elements[PdfStream.Keys.Filter] = new PdfName("/CCITTFaxDecode");
//PdfArray array2 = new PdfArray(_document);
PdfDictionary dictionary = new PdfDictionary();
if (k != 0)
{
dictionary.Elements.Add("/K", new PdfInteger(k));
}
if (isBitonal < 0)
{
dictionary.Elements.Add("/BlackIs1", new PdfBoolean(true));
}
dictionary.Elements.Add("/EndOfBlock", new PdfBoolean(false));
dictionary.Elements.Add("/Columns", new PdfInteger(width));
dictionary.Elements.Add("/Rows", new PdfInteger(height));
//array2.Elements.Add(dictionary);
Elements[PdfStream.Keys.DecodeParms] = dictionary; // array2;
}
else
{
Stream = new PdfStream(imageDataFaxCompressed, this);
Elements[PdfStream.Keys.Length] = new PdfInteger(imageDataFaxCompressed.Length);
PdfArray arrayFilters = new PdfArray(_document);
arrayFilters.Elements.Add(new PdfName("/FlateDecode"));
arrayFilters.Elements.Add(new PdfName("/CCITTFaxDecode"));
Elements[PdfStream.Keys.Filter] = arrayFilters;
PdfArray arrayDecodeParms = new PdfArray(_document);
PdfDictionary dictFlateDecodeParms = new PdfDictionary();
//dictFlateDecodeParms.Elements.Add("/Columns", new PdfInteger(1));
PdfDictionary dictCcittFaxDecodeParms = new PdfDictionary();
if (k != 0)
{
dictCcittFaxDecodeParms.Elements.Add("/K", new PdfInteger(k));
}
if (isBitonal < 0)
{
dictCcittFaxDecodeParms.Elements.Add("/BlackIs1", new PdfBoolean(true));
}
dictCcittFaxDecodeParms.Elements.Add("/EndOfBlock", new PdfBoolean(false));
dictCcittFaxDecodeParms.Elements.Add("/Columns", new PdfInteger(width));
dictCcittFaxDecodeParms.Elements.Add("/Rows", new PdfInteger(height));
arrayDecodeParms.Elements.Add(dictFlateDecodeParms); // How to add the "null object"?
arrayDecodeParms.Elements.Add(dictCcittFaxDecodeParms);
Elements[PdfStream.Keys.DecodeParms] = arrayDecodeParms;
}
}
else
{
// /FlateDecode creates the smaller file (or no monochrome bitmap):
Stream = new PdfStream(imageDataCompressed, this);
Elements[PdfStream.Keys.Length] = new PdfInteger(imageDataCompressed.Length);
Elements[PdfStream.Keys.Filter] = new PdfName("/FlateDecode");
}
Elements[Keys.Width] = new PdfInteger(width);
Elements[Keys.Height] = new PdfInteger(height);
Elements[Keys.BitsPerComponent] = new PdfInteger(bits);
// TODO: CMYK
// CCITT encoding: we need color palette for isBitonal == 0
// FlateDecode: we need color palette for isBitonal <= 0 unless we have grayscales
if ((usesCcittEncoding && isBitonal == 0) ||
(!usesCcittEncoding && isBitonal <= 0 && !isGray))
{
PdfDictionary colorPalette = null;
colorPalette = new PdfDictionary(_document);
byte[] packedPaletteData = paletteData.Length >= 48 ? fd.Encode(paletteData, _document.Options.FlateEncodeMode) : null; // don't compress small palettes
if (packedPaletteData != null && packedPaletteData.Length + 20 < paletteData.Length) // +20: compensate for the overhead (estimated value)
{
// Create compressed color palette:
colorPalette.CreateStream(packedPaletteData);
colorPalette.Elements[PdfStream.Keys.Length] = new PdfInteger(packedPaletteData.Length);
colorPalette.Elements[PdfStream.Keys.Filter] = new PdfName("/FlateDecode");
}
else
{
// Create uncompressed color palette:
colorPalette.CreateStream(paletteData);
colorPalette.Elements[PdfStream.Keys.Length] = new PdfInteger(paletteData.Length);
}
Owner._irefTable.Add(colorPalette);
PdfArray arrayColorSpace = new PdfArray(_document);
arrayColorSpace.Elements.Add(new PdfName("/Indexed"));
arrayColorSpace.Elements.Add(new PdfName("/DeviceRGB"));
arrayColorSpace.Elements.Add(new PdfInteger(paletteColors - 1));
arrayColorSpace.Elements.Add(colorPalette.Reference);
Elements[Keys.ColorSpace] = arrayColorSpace;
}
else
{
Elements[Keys.ColorSpace] = new PdfName("/DeviceGray");
}
if (_image.Interpolate)
{
Elements[Keys.Interpolate] = PdfBoolean.True;
}
}
}
/// <summary>
/// Reads images that are returned from GDI+ without color palette.
/// </summary>
/// <param name="components">4 (32bpp RGB), 3 (24bpp RGB, 32bpp ARGB)</param>
/// <param name="bits">8</param>
/// <param name="hasAlpha">true (ARGB), false (RGB)</param>
private void ReadTrueColorMemoryBitmap(int components, int bits, bool hasAlpha)
{
int pdfVersion = Owner.Version;
MemoryStream memory = new MemoryStream();
memory = _image.AsBitmap();
// THHO4THHO Use ImageImporterBMP here to avoid redundant code.
int streamLength = (int)memory.Length;
Debug.Assert(streamLength > 0, "Bitmap image encoding failed.");
if (streamLength > 0)
{
byte[] imageBits = new byte[streamLength];
memory.Seek(0, SeekOrigin.Begin);
memory.Read(imageBits, 0, streamLength);
memory.Dispose();
int height = _image.PixelHeight;
int width = _image.PixelWidth;
// TODO: we could define structures for
// BITMAPFILEHEADER
// { BITMAPINFO }
// BITMAPINFOHEADER
// to avoid ReadWord and ReadDWord ... (but w/o pointers this doesn't help much)
bool bigHeader = false;
if (ReadWord(imageBits, 0) != 0x4d42 || // "BM"
ReadDWord(imageBits, 2) != streamLength ||
ReadDWord(imageBits, 18) != width ||
ReadDWord(imageBits, 22) != height)
{
throw new NotImplementedException("ReadTrueColorMemoryBitmap: unsupported format");
}
int infoHeaderSize = ReadDWord(imageBits, 14); // sizeof BITMAPINFOHEADER
if (infoHeaderSize != 40 && infoHeaderSize != 108)
{
throw new NotImplementedException("ReadTrueColorMemoryBitmap: unsupported format #2");
}
bigHeader = infoHeaderSize == 108;
if (ReadWord(imageBits, 26) != 1 ||
(!hasAlpha && ReadWord(imageBits, bigHeader?30:28) != components * bits ||
hasAlpha && ReadWord(imageBits, bigHeader?30:28) != (components + 1) * bits) ||
bigHeader ? ReadWord(imageBits, 32) != 0 : ReadDWord(imageBits, 30) != 0)
{
throw new NotImplementedException("ReadTrueColorMemoryBitmap: unsupported format #3");
}
int nFileOffset = ReadDWord(imageBits, 10);
int logicalComponents = components;
if (components == 4)
{
logicalComponents = 3;
}
byte[] imageData = new byte[components * width * height];
bool hasMask = false;
bool hasAlphaMask = false;
byte[] alphaMask = hasAlpha ? new byte[width * height] : null;
MonochromeMask mask = hasAlpha ?
new MonochromeMask(width, height) : null;
int nOffsetRead = 0;
if (logicalComponents == 3)
{
for (int y = 0; y < height; ++y)
{
int nOffsetWrite = 3 * (height - 1 - y) * width;
int nOffsetWriteAlpha = 0;
if (hasAlpha)
{
mask.StartLine(y);
nOffsetWriteAlpha = (height - 1 - y) * width;
}
for (int x = 0; x < width; ++x)
{
imageData[nOffsetWrite] = imageBits[nFileOffset + nOffsetRead + 2];
imageData[nOffsetWrite + 1] = imageBits[nFileOffset + nOffsetRead + 1];
imageData[nOffsetWrite + 2] = imageBits[nFileOffset + nOffsetRead];
if (hasAlpha)
{
mask.AddPel(imageBits[nFileOffset + nOffsetRead + 3]);
alphaMask[nOffsetWriteAlpha] = imageBits[nFileOffset + nOffsetRead + 3];
if (!hasMask || !hasAlphaMask)
{
if (imageBits[nFileOffset + nOffsetRead + 3] != 255)
{
hasMask = true;
if (imageBits[nFileOffset + nOffsetRead + 3] != 0)
{
hasAlphaMask = true;
}
}
}
++nOffsetWriteAlpha;
}
nOffsetRead += hasAlpha ? 4 : components;
nOffsetWrite += 3;
}
nOffsetRead = 4 * ((nOffsetRead + 3) / 4); // Align to 32 bit boundary
}
}
else if (components == 1)
{
// Grayscale
throw new NotImplementedException("Image format not supported (grayscales).");
}
FlateDecode fd = new FlateDecode();
if (hasMask)
{
// monochrome mask is either sufficient or
// provided for compatibility with older reader versions
byte[] maskDataCompressed = fd.Encode(mask.MaskData, _document.Options.FlateEncodeMode);
PdfDictionary pdfMask = new PdfDictionary(_document);
pdfMask.Elements.SetName(Keys.Type, "/XObject");
pdfMask.Elements.SetName(Keys.Subtype, "/Image");
Owner._irefTable.Add(pdfMask);
pdfMask.Stream = new PdfStream(maskDataCompressed, pdfMask);
pdfMask.Elements[PdfStream.Keys.Length] = new PdfInteger(maskDataCompressed.Length);
pdfMask.Elements[PdfStream.Keys.Filter] = new PdfName("/FlateDecode");
pdfMask.Elements[Keys.Width] = new PdfInteger(width);
pdfMask.Elements[Keys.Height] = new PdfInteger(height);
pdfMask.Elements[Keys.BitsPerComponent] = new PdfInteger(1);
pdfMask.Elements[Keys.ImageMask] = new PdfBoolean(true);
Elements[Keys.Mask] = pdfMask.Reference;
}
if (hasMask && hasAlphaMask && pdfVersion >= 14)
{
// The image provides an alpha mask (requires Arcrobat 5.0 or higher)
byte[] alphaMaskCompressed = fd.Encode(alphaMask, _document.Options.FlateEncodeMode);
PdfDictionary smask = new PdfDictionary(_document);
smask.Elements.SetName(Keys.Type, "/XObject");
smask.Elements.SetName(Keys.Subtype, "/Image");
Owner._irefTable.Add(smask);
smask.Stream = new PdfStream(alphaMaskCompressed, smask);
smask.Elements[PdfStream.Keys.Length] = new PdfInteger(alphaMaskCompressed.Length);
smask.Elements[PdfStream.Keys.Filter] = new PdfName("/FlateDecode");
smask.Elements[Keys.Width] = new PdfInteger(width);
smask.Elements[Keys.Height] = new PdfInteger(height);
smask.Elements[Keys.BitsPerComponent] = new PdfInteger(8);
smask.Elements[Keys.ColorSpace] = new PdfName("/DeviceGray");
Elements[Keys.SMask] = smask.Reference;
}
byte[] imageDataCompressed = fd.Encode(imageData, _document.Options.FlateEncodeMode);
Stream = new PdfStream(imageDataCompressed, this);
Elements[PdfStream.Keys.Length] = new PdfInteger(imageDataCompressed.Length);
Elements[PdfStream.Keys.Filter] = new PdfName("/FlateDecode");
Elements[Keys.Width] = new PdfInteger(width);
Elements[Keys.Height] = new PdfInteger(height);
Elements[Keys.BitsPerComponent] = new PdfInteger(8);
// TODO: CMYK
Elements[Keys.ColorSpace] = new PdfName("/DeviceRGB");
if (_image.Interpolate)
{
Elements[Keys.Interpolate] = PdfBoolean.True;
}
}
}
