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;
}
}