/// <summary>
/// Gets a <see cref="Bitmap"/> from an EDSDK pointer to an image (Jpg or Raw)
/// </summary>
/// <param name="imgStream">Stream pointer to the image</param>
/// <param name="imageSource">The result image type</param>
/// <returns>A <see cref="Bitmap"/> image from the given stream pointer</returns>
protected Bitmap GetImage(IntPtr imgStream, ImageSource imageSource)
{
IntPtr imgRef = IntPtr.Zero;
IntPtr streamPointer = IntPtr.Zero;
ImageInfo imageInfo;
try
{
//create reference and get image info
ErrorHandler.CheckError(this, CanonSDK.EdsCreateImageRef(imgStream, out imgRef));
ErrorHandler.CheckError(this, CanonSDK.EdsGetImageInfo(imgRef, imageSource, out imageInfo));
Size outputSize = new Size();
outputSize.Width = imageInfo.EffectiveRect.Width;
outputSize.Height = imageInfo.EffectiveRect.Height;
//calculate amount of data
int datalength = outputSize.Height * outputSize.Width * 3;
//create buffer that stores the image
byte[] buffer = new byte[datalength];
//create a stream to the buffer
using (var stream = new SDKStream(buffer))
{
//load image into the buffer
ErrorHandler.CheckError(this, CanonSDK.EdsGetImage(imgRef, imageSource, TargetImageType.RGB, imageInfo.EffectiveRect, outputSize, stream.Reference));
//make BGR from RGB (System.Drawing (i.e. GDI+) uses BGR)
unsafe
{
byte tmp;
fixed(byte *pix = buffer)
{
for (long i = 0; i < datalength; i += 3)
{
tmp = pix[i]; //Save B value
pix[i] = pix[i + 2]; //Set B value with R value
pix[i + 2] = tmp; //Set R value with B value
}
}
}
//Get pointer to stream data
ErrorHandler.CheckError(this, CanonSDK.EdsGetPointer(stream.Reference, out streamPointer));
//Create bitmap with the data in the buffer
return(new Bitmap(outputSize.Width, outputSize.Height, datalength, PixelFormat.Format24bppRgb, streamPointer));
}
}
finally
{
//Release all data
if (imgStream != IntPtr.Zero)
{
ErrorHandler.CheckError(this, CanonSDK.EdsRelease(imgStream));
}
if (imgRef != IntPtr.Zero)
{
ErrorHandler.CheckError(this, CanonSDK.EdsRelease(imgRef));
}
}
}
/// <summary>
/// Gets a thumbnail from a Raw or Jpg image
/// </summary>
/// <param name="filepath">Path to the image file</param>
/// <returns>A <see cref="Bitmap"/> thumbnail from the provided image file</returns>
public Bitmap GetFileThumb(string filepath)
{
//create a file stream to given file
using (var stream = new SDKStream(filepath, FileCreateDisposition.OpenExisting, FileAccess.Read))
{
//Create a thumbnail Bitmap from the stream
return(GetImage(stream.Reference, ImageSource.Thumbnail));
}
}