public Bitmap RenderToBitmap()
{
Bitmap bitmap = new Bitmap(_rectangle.Width, _rectangle.Height);
using (Graphics graphics = Graphics.FromImage(bitmap))
{
IntPtr hdc = graphics.GetHdc();
try
{
Gdi32Native.SetDIBitsToDevice(hdc, 0, 0, _rectangle.Width, _rectangle.Height,
0, 0, 0, _rectangle.Height, _pixelInfoPointer, _bitmapPointer, 0);
}
finally
{
graphics.ReleaseHdc(hdc);
}
}
try
{
bitmap.SetResolution(PpmToDpi(_bitmapInfo.XPelsPerMeter), PpmToDpi(_bitmapInfo.YPelsPerMeter));
}
catch { }
return(bitmap);
}
public static Bitmap NewBitmapFromHBitmap(IntPtr dibHandle)
{
IntPtr _bitmapPointer;
IntPtr _pixelInfoPointer;
Rectangle _rectangle;
BitmapInfoHeader _bitmapInfo;
Bitmap bitmap;
_bitmapPointer = Kernel32Native.GlobalLock(dibHandle);
try {
_bitmapInfo = new BitmapInfoHeader();
Marshal.PtrToStructure(_bitmapPointer, _bitmapInfo);
log.Debug(_bitmapInfo.ToString());
_rectangle = new Rectangle();
_rectangle.X = _rectangle.Y = 0;
_rectangle.Width = _bitmapInfo.Width;
_rectangle.Height = _bitmapInfo.Height;
if (_bitmapInfo.SizeImage == 0)
{
_bitmapInfo.SizeImage = ((((_bitmapInfo.Width * _bitmapInfo.BitCount) + 31) & ~31) >> 3) * _bitmapInfo.Height;
}
// compute the offset to the pixel info, which follows the bitmap info header
{
// The following code only works on x86
Debug.Assert(Marshal.SizeOf(typeof(IntPtr)) == 4);
int pixelInfoPointer = _bitmapInfo.ClrUsed;
if ((pixelInfoPointer == 0) && (_bitmapInfo.BitCount <= 8))
{
pixelInfoPointer = 1 << _bitmapInfo.BitCount;
}
pixelInfoPointer = (pixelInfoPointer * 4) + _bitmapInfo.Size + _bitmapPointer.ToInt32();
_pixelInfoPointer = new IntPtr(pixelInfoPointer);
}
// render to bitmap
bitmap = new Bitmap(_rectangle.Width, _rectangle.Height);
using (Graphics graphics = Graphics.FromImage(bitmap)) {
IntPtr hdc = graphics.GetHdc();
try {
Gdi32Native.SetDIBitsToDevice(hdc, 0, 0, _rectangle.Width, _rectangle.Height,
0, 0, 0, _rectangle.Height, _pixelInfoPointer, _bitmapPointer, 0);
}
finally {
graphics.ReleaseHdc(hdc);
}
}
bitmap.SetResolution(PpmToDpi(_bitmapInfo.XPelsPerMeter), PpmToDpi(_bitmapInfo.YPelsPerMeter));
} finally {
Kernel32Native.GlobalUnlock(dibHandle);
}
return(bitmap);
}
private static void TransferPixelsGreyscale(Bitmap bitmap_dest,
TwainDotNet.TwainNative.ImageInfo imageInfo, TwainDotNet.TwainNative.ImageMemXfer memxfer_src)
{
BitmapInfoHeaderIndexedColor bitmapInfo = new BitmapInfoHeaderIndexedColor();
bitmapInfo.Width = (int)memxfer_src.Columns;
bitmapInfo.Height = -(int)memxfer_src.Rows;
// bitmapInfo.Size = sizeof(BitmapInfoHeader); // requires unsafe
bitmapInfo.Size = 40; // the size of the initial header, not including color table
bitmapInfo.Planes = 1;
bitmapInfo.SizeImage = 0;
bitmapInfo.BitCount = imageInfo.BitsPerPixel;
if (imageInfo.Planar == (short)TwainNative.TwainBool.True)
{
throw new TwainException("Planar format invalid for greyscale data.");
}
if (imageInfo.BitsPerPixel == 8)
{
BitmapInfoHeaderIndexedColor.setupGreyscaleIndices(ref bitmapInfo);
bitmapInfo.ClrUsed = 256;
}
else if (imageInfo.BitsPerPixel == 1)
{
BitmapInfoHeaderIndexedColor.setupBWIndices(ref bitmapInfo);
bitmapInfo.ClrUsed = 2;
}
else
{
throw new TwainException("TransferPixelsGreyscale() only supports 8 bits per pixel");
}
using (Graphics graphics = Graphics.FromImage(bitmap_dest))
{
IntPtr hdc = graphics.GetHdc();
try
{
Gdi32Native.SetDIBitsToDevice(
hdc,
(int)memxfer_src.XOffset,
(int)memxfer_src.YOffset,
(int)memxfer_src.Columns,
(int)memxfer_src.Rows,
0, 0, 0,
(int)memxfer_src.Rows,
memxfer_src.Memory.TheMem,
bitmapInfo,
0);
}
finally
{
graphics.ReleaseHdc(hdc);
}
}
}
public Bitmap RenderToBitmap()
{
Bitmap bitmap = new Bitmap(_rectangle.Width, _rectangle.Height);
using (Graphics graphics = Graphics.FromImage(bitmap))
{
IntPtr hdc = graphics.GetHdc();
try
{
Gdi32Native.SetDIBitsToDevice(hdc, 0, 0, _rectangle.Width, _rectangle.Height,
0, 0, 0, _rectangle.Height, _pixelInfoPointer, _bitmapPointer, 0);
}
finally
{
graphics.ReleaseHdc(hdc);
}
}
return(bitmap);
}
private static void TransferPixelsRGB(
Bitmap bitmap_dest,
TwainDotNet.TwainNative.ImageInfo imageInfo,
TwainDotNet.TwainNative.ImageMemXfer memxfer_src)
{
BitmapInfoHeader bitmapInfo = new BitmapInfoHeader();
bitmapInfo.Width = (int)memxfer_src.Columns;
bitmapInfo.Height = -(int)memxfer_src.Rows; // If biHeight is negative, the bitmap is a top-down DIB and its origin is the upper-left corner.
// bitmapInfo.Size = sizeof(BitmapInfoHeader); // requires unsafe
bitmapInfo.Size = 40;
bitmapInfo.Planes = 1;
bitmapInfo.SizeImage = (int)memxfer_src.Memory.Length;
bitmapInfo.ClrUsed = 0; // we are not using the indexed color table
bitmapInfo.Compression = 0; //BI_RGB An uncompressed format.
bitmapInfo.ClrImportant = 0; //If this value is zero, all colors are required.
if (imageInfo.Planar == (short)TwainNative.TwainBool.True)
{
// this means the data is in the buffer as RRRR-GGGGG-BBBB instead of RGB-RGB-RGB
// we don't currently support this decoding
throw new TwainException("Planar image format Unsupported.");
}
// imageInfo.BitsPerPixel can be (1, 8, 24, 40) - Twain Spec page (8-39)
// "The number of bits in each image pixel (or bit depth). This value is invariant across the
// image. 24 - bit R - G - B has BitsPerPixel = 24. 40 - bit C - M - Y - K has BitsPerPixel = 40.
// 8 - bit Grayscale has BitsPerPixel = 8.Black and White has BitsPerPixel = 1."
switch (imageInfo.BitsPerPixel)
{
case 24:
bitmapInfo.BitCount = imageInfo.BitsPerPixel;
break;
case 1: // imageInfo is 1bit B&W, should be in TransferPixelsGreyscale()
case 8: // imageInfo is 8bit grayscale, should be in TransferPixelsGreyscale()
case 40: // imageInfo is 40bit CMYL. DIBitmap only supports up to 32bits per pixel RGB.
default:
throw new TwainException("TransferPixelsRGB: unhandled image bit depth: " + imageInfo.BitsPerPixel.ToString());
}
//IntPtr scan0 = new IntPtr(memxfer_src.Memory.TheMem.ToInt32() + 40);
//Bitmap bitmap = new Bitmap(bitmapInfo.Width, bitmapInfo.Height, bitmapInfo.Width * 3, System.Drawing.Imaging.PixelFormat.Format24bppRgb, scan0);
using (Graphics graphics = Graphics.FromImage(bitmap_dest))
{
IntPtr hdc = graphics.GetHdc();
try
{
Gdi32Native.SetDIBitsToDevice(
hdc,
(int)memxfer_src.XOffset,
(int)memxfer_src.YOffset,
(int)memxfer_src.Columns,
(int)memxfer_src.Rows,
0, 0, 0,
(int)memxfer_src.Rows,
memxfer_src.Memory.TheMem,
bitmapInfo,
0);
}
finally
{
graphics.ReleaseHdc(hdc);
}
}
}
