private void CopyIndexedMemoryBitmap(int bits/*, ref bool hasAlpha*/, ImageDataBitmap dest)
{
int firstMaskColor = -1, lastMaskColor = -1;
bool segmentedColorMask = false;
int bytesColorPaletteOffset = ((ImagePrivateDataBitmap)Image.Data).ColorPaletteOffset; // GDI+ always returns Windows bitmaps: sizeof BITMAPFILEHEADER + sizeof BITMAPINFOHEADER
int bytesFileOffset = ((ImagePrivateDataBitmap)Image.Data).Offset;
uint paletteColors = Image.Information.ColorsUsed;
int width = (int)Image.Information.Width;
int height = (int)Image.Information.Height;
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] = Data[bytesColorPaletteOffset + 4 * color + 2];
paletteData[3 * color + 1] = Data[bytesColorPaletteOffset + 4 * color + 1];
paletteData[3 * color + 2] = Data[bytesColorPaletteOffset + 4 * color + 0];
if (isGray)
isGray = paletteData[3 * color] == paletteData[3 * color + 1] &&
paletteData[3 * color] == paletteData[3 * color + 2];
if (Data[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 && dest._document.Options.EnableCcittCompressionForBilevelImages)
{
// 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 = PdfImage.DoFaxEncodingGroup4(ref tempG4, Data, (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 * Data[bytesFileOffset + bytesOffsetRead]];
}
else
{
// Store the palette index.
imageData[bytesOffsetWrite] = Data[bytesFileOffset + bytesOffsetRead];
}
if (firstMaskColor != -1)
{
int n = Data[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");
}
}
dest.Data = imageData;
dest.Length = imageData.Length;
if (imageDataFax != null)
{
dest.DataFax = imageDataFax;
dest.LengthFax = imageDataFax.Length;
}
dest.IsGray = isGray;
dest.K = k;
dest.IsBitonal = isBitonal;
dest.PaletteData = paletteData;
dest.PaletteDataLength = paletteData.Length;
dest.SegmentedColorMask = segmentedColorMask;
//if (alphaMask != null)
//{
// dest.AlphaMask = alphaMask;
// dest.AlphaMaskLength = alphaMask.Length;
//}
if (mask != null && firstMaskColor != -1)
{
dest.BitmapMask = mask.MaskData;
dest.BitmapMaskLength = mask.MaskData.Length;
}
}
/* 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*/)
{
#if DEBUG_
image.image.Save("$$$.bmp", ImageFormat.Bmp);
#endif
int pdfVersion = Owner.Version;
int firstMaskColor = -1, lastMaskColor = -1;
bool segmentedColorMask = false;
MemoryStream memory = new MemoryStream();
#if GDI
image.gdiImage.Save(memory, ImageFormat.Bmp);
#endif
#if WPF
#if !SILVERLIGHT
// WPFTHHO: StL: keine Ahnung ob das so stimmt.
BmpBitmapEncoder encoder = new BmpBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(image.wpfImage));
encoder.Save(memory);
#else
// AGHACK
#endif
#endif
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.Close();
int height = image.PixelHeight;
int width = image.PixelWidth;
if (ReadWord(imageBits, 0) != 0x4d42 || // "BM"
ReadDWord(imageBits, 2) != streamLength ||
ReadDWord(imageBits, 14) != 40 || // sizeof BITMAPINFOHEADER
#if WPF
// TODOWPF: bug with height and width??? With which files???
ReadDWord(imageBits, 18) != width ||
ReadDWord(imageBits, 22) != height)
#else
ReadDWord(imageBits, 18) != width ||
ReadDWord(imageBits, 22) != height)
#endif
{
throw new NotImplementedException("ReadIndexedMemoryBitmap: unsupported format");
}
#if WPF
// TODOWPF: bug with height and width
width = ReadDWord(imageBits, 18);
height = ReadDWord(imageBits, 22);
#endif
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);
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)
// { ... }
FlateDecode fd = new FlateDecode();
PdfDictionary colorPalette = null;
if (isBitonal == 0 && !isGray)
{
colorPalette = new PdfDictionary(this.document);
byte[] packedPaletteData = paletteData.Length >= 48 ? fd.Encode(paletteData) : 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[Keys.Length] = new PdfInteger(packedPaletteData.Length);
colorPalette.Elements[Keys.Filter] = new PdfName("/FlateDecode");
}
else
{
// Create uncompressed color palette:
colorPalette.CreateStream(paletteData);
colorPalette.Elements[Keys.Length] = new PdfInteger(paletteData.Length);
}
Owner.irefTable.Add(colorPalette);
}
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");
}
}
if (firstMaskColor != -1 &&
lastMaskColor != -1)
{
// Color mask requires Reader 4.0 or higher:
if (!segmentedColorMask && pdfVersion >= 13)
{
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);
PdfDictionary pdfMask = new PdfDictionary(document);
pdfMask.Elements.SetName(Keys.Type, "/XObject");
pdfMask.Elements.SetName(Keys.Subtype, "/Image");
this.Owner.irefTable.Add(pdfMask);
pdfMask.Stream = new PdfStream(maskDataCompressed, pdfMask);
pdfMask.Elements[Keys.Length] = new PdfInteger(maskDataCompressed.Length);
pdfMask.Elements[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);
byte[] imageDataFaxCompressed = isFaxEncoding ? fd.Encode(imageDataFax) : 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[Keys.Length] = new PdfInteger(imageDataFax.Length);
Elements[Keys.Filter] = new PdfName("/CCITTFaxDecode");
//PdfArray array2 = new PdfArray(this.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[Keys.DecodeParms] = dictionary; // array2;
}
else
{
Stream = new PdfStream(imageDataFaxCompressed, this);
Elements[Keys.Length] = new PdfInteger(imageDataFaxCompressed.Length);
PdfArray arrayFilters = new PdfArray(document);
arrayFilters.Elements.Add(new PdfName("/FlateDecode"));
arrayFilters.Elements.Add(new PdfName("/CCITTFaxDecode"));
Elements[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[Keys.DecodeParms] = arrayDecodeParms;
}
}
else
{
// /FlateDecode creates the smaller file (or no monochrome bitmap):
Stream = new PdfStream(imageDataCompressed, this);
Elements[Keys.Length] = new PdfInteger(imageDataCompressed.Length);
Elements[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))
{
PdfArray arrayColorSpace = new PdfArray(document);
arrayColorSpace.Elements.Add(new PdfName("/Indexed"));
arrayColorSpace.Elements.Add(new PdfName("/DeviceRGB"));
arrayColorSpace.Elements.Add(new PdfInteger(paletteColors - 1));
// ReSharper disable PossibleNullReferenceException
arrayColorSpace.Elements.Add(colorPalette.Reference);
// ReSharper restore PossibleNullReferenceException
Elements[Keys.ColorSpace] = arrayColorSpace;
}
else
{
Elements[Keys.ColorSpace] = new PdfName("/DeviceGray");
}
if (image.Interpolate)
Elements[Keys.Interpolate] = PdfBoolean.True;
}
}
/* 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)
{
#if DEBUG_
image.image.Save("$$$.bmp", ImageFormat.Bmp);
#endif
int pdfVersion = this.Owner.Version;
int firstMaskColor = -1, lastMaskColor = -1;
bool segmentedColorMask = false;
MemoryStream memory = new MemoryStream();
#if GDI
image.gdiImage.Save(memory, ImageFormat.Bmp);
#endif
#if WPF
// WPFTHHO: StL: keine Ahnung ob das so stimmt.
BmpBitmapEncoder encoder = new BmpBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(this.image.wpfImage));
encoder.Save(memory);
#endif
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.Close();
int height = this.image.PixelHeight;
int width = this.image.PixelWidth;
if (ReadWord(imageBits, 0) != 0x4d42 || // "BM"
ReadDWord(imageBits, 2) != streamLength ||
ReadDWord(imageBits, 14) != 40 || // sizeof BITMAPINFOHEADER
#if WPF
// TODOWPF: bug with height and width
false)
#else
ReadDWord(imageBits, 18) != width ||
ReadDWord(imageBits, 22) != height)
#endif
{
throw new NotImplementedException("ReadIndexedMemoryBitmap: unsupported format");
}
#if WPF
// TODOWPF: bug with height and width
width = ReadDWord(imageBits, 18);
height = ReadDWord(imageBits, 22);
#endif
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);
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);
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 (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:
}
}
// NYI: (no sample found where this was required)
// if (segmentedColorMask = true)
// { ... }
FlateDecode fd = new FlateDecode();
PdfDictionary colorPalette = new PdfDictionary(this.document);
// TODO: decide at run-time if compression makes sense
#if false
// Create uncompressed color palette:
colorPalette.CreateStream(paletteData);
colorPalette.Elements[Keys.Length] = new PdfInteger(paletteData.Length);
#else
// Create compressed color palette:
byte[] packedPaletteData = fd.Encode(paletteData);
colorPalette.CreateStream(packedPaletteData);
colorPalette.Elements[Keys.Length] = new PdfInteger(packedPaletteData.Length);
colorPalette.Elements[Keys.Filter] = new PdfName("/FlateDecode");
#endif
this.Owner.irefTable.Add(colorPalette);
byte[] imageData = new byte[1 * width * height];
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)
{
imageData[bytesOffsetWrite] = imageBits[bytesFileOffset + bytesOffsetRead];
if (firstMaskColor != -1)
{
int n = imageBits[bytesFileOffset + bytesOffsetRead];
if (bits == 8)
{
// TODO???: segmentedColorMask == true => falsche Maske NYI
mask.AddPel((n >= firstMaskColor) && (n <= lastMaskColor));
}
else if (bits == 4)
{
// TODO???: segmentedColorMask == true => falsche Maske 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");
}
if (firstMaskColor != -1 &&
lastMaskColor != -1)
{
// Color mask requires Reader 4.0 or higher:
if (!segmentedColorMask && pdfVersion >= 13)
{
PdfArray array = new PdfArray(this.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);
PdfDictionary pdfMask = new PdfDictionary(this.document);
pdfMask.Elements.SetName(Keys.Type, "/XObject");
pdfMask.Elements.SetName(Keys.Subtype, "/Image");
this.Owner.irefTable.Add(pdfMask);
pdfMask.Stream = new PdfStream(maskDataCompressed, pdfMask);
pdfMask.Elements[Keys.Length] = new PdfInteger(maskDataCompressed.Length);
pdfMask.Elements[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);
Stream = new PdfStream(imageDataCompressed, this);
Elements[Keys.Length] = new PdfInteger(imageDataCompressed.Length);
Elements[Keys.Filter] = new PdfName("/FlateDecode");
Elements[Keys.Width] = new PdfInteger(width);
Elements[Keys.Height] = new PdfInteger(height);
Elements[Keys.BitsPerComponent] = new PdfInteger(bits);
PdfArray array2 = new PdfArray(this.document);
array2.Elements.Add(new PdfName("/Indexed"));
// TODO: CMYK
array2.Elements.Add(new PdfName("/DeviceRGB"));
array2.Elements.Add(new PdfInteger(paletteColors - 1));
array2.Elements.Add(colorPalette.Reference);
Elements[Keys.ColorSpace] = array2;
}
}
