static private Image SaveStreamContents(PdfImageInfo imageInfo, byte[] byteArray)
{
Image result = null;
Int32 BitsPerComponent = imageInfo.BitsPerComponent;
Int32 ImageWidth = imageInfo.Width;
Int32 ImageHeight = imageInfo.Height;
if(BitsPerComponent == 8)
{
ColorSpaceEnum ColorSpace = imageInfo.ColorSpace;
if((ColorSpace == ColorSpaceEnum.RGB) || (ColorSpace == ColorSpaceEnum.Gray))
{
// create empty bitmap
Bitmap BM = new Bitmap(ImageWidth, ImageHeight, PixelFormat.Format24bppRgb);
// create a new contents array with bmp width
Byte[] PixelBuf = new Byte[((3 * ImageWidth + 3) & ~3) * ImageHeight];
// copy row by row
Int32 IPtr = 0;
Int32 BPtr = 0;
if(ColorSpace == ColorSpaceEnum.RGB)
{
for(Int32 Row = 0; Row < ImageHeight; Row++)
{
// copy column by column
for(Int32 Col = 0; Col < ImageWidth; Col++)
{
PixelBuf[BPtr + 2] = byteArray[IPtr++];
PixelBuf[BPtr + 1] = byteArray[IPtr++];
PixelBuf[BPtr] = byteArray[IPtr++];
BPtr += 3;
}
BPtr = (BPtr + 3) & ~3;
}
}
else
{
for(Int32 Row = 0; Row < ImageHeight; Row++)
{
// copy column by column
for(Int32 Col = 0; Col < ImageWidth; Col++)
{
PixelBuf[BPtr + 2] = byteArray[IPtr];
PixelBuf[BPtr + 1] = byteArray[IPtr];
PixelBuf[BPtr] = byteArray[IPtr++]; // Increment only after the last one
BPtr += 3;
}
BPtr = (BPtr + 3) & ~3;
}
}
// Lock the bitmap's bits.
Rectangle LockRect = new Rectangle(0, 0, ImageWidth, ImageHeight);
BitmapData BmpData = BM.LockBits(LockRect, ImageLockMode.WriteOnly, BM.PixelFormat);
// Get the address of the first line.
IntPtr ImagePtr = BmpData.Scan0;
// Copy contents into the bitmap
Marshal.Copy(PixelBuf, 0, ImagePtr, PixelBuf.Length);
// unlock the bitmap
BM.UnlockBits(BmpData);
result = BM;
}
}
else if(BitsPerComponent == 1)
{
// create empty bitmap
Bitmap BM = new Bitmap(ImageWidth, ImageHeight, PixelFormat.Format1bppIndexed);
// Lock the bitmap's bits.
Rectangle LockRect = new Rectangle(0, 0, ImageWidth, ImageHeight);
BitmapData BmpData = BM.LockBits(LockRect, ImageLockMode.WriteOnly, PixelFormat.Format1bppIndexed);
Byte[] PixelBuf = new Byte[BmpData.Stride * BmpData.Height];
int instride = (ImageWidth + 7) / 8;
int outstride = BmpData.Stride;
int inpos = 0;
int outpos = 0;
for(int y = 0; y < BmpData.Height; y++)
{
Array.Copy(byteArray, inpos, PixelBuf, outpos, instride);
inpos += instride;
outpos += outstride;
}
// Get the address of the first line.
IntPtr ImagePtr = BmpData.Scan0;
// Copy contents into the bitmap
Marshal.Copy(PixelBuf, 0, ImagePtr, PixelBuf.Length);
// unlock the bitmap
BM.UnlockBits(BmpData);
result = BM;
}
else
{ }
return result;
}
private static PdfImageInfo GetImageInfoFromObject(IntPtr pageObject)
{
PdfImageInfo info = new PdfImageInfo();
unsafe
{
Pdfium.GetImageFromPageObject(pageObject, &info);
}
return info;
}
