/// <summary>
/// Given size units in normal pixels, translate them into device independent pixels (the out parameters)
/// </summary>
/// <param name="widthInPixels"></param>
/// <param name="heightInPixels"></param>
/// <param name="widthInDeviceIndependentPixels"></param>
/// <param name="heightInDeviceIndependentPixels"></param>
public static void TransformPixelsToDeviceIndependentPixels(int widthInPixels,
int heightInPixels,
out double widthInDeviceIndependentPixels,
out double heightInDeviceIndependentPixels)
{
IntPtr hDc = GetDC(IntPtr.Zero);
if (hDc != IntPtr.Zero)
{
int dpiX = GetDeviceCaps(hDc, LOGPIXELSX);
int dpiY = GetDeviceCaps(hDc, LOGPIXELSY);
_ = ReleaseDC(IntPtr.Zero, hDc);
widthInDeviceIndependentPixels = 96 * widthInPixels / (double)dpiX;
heightInDeviceIndependentPixels = 96 * heightInPixels / (double)dpiY;
}
else
{
// This is very unlikely.
// As a workaround, we just return the original pixel size. While this may not be the correct size (depending on the actual dpi),
// it will not crash the program and at least maintains the correct aspect ration
widthInDeviceIndependentPixels = widthInPixels;
heightInDeviceIndependentPixels = heightInPixels;
TracePrint.PrintMessage("In TransformPixelsToDeviceIndependentPixels: Failed to get DC.");
}
}
public static Dictionary <string, ImageMetadata> LoadMetadata(string filePath)
{
Dictionary <string, ImageMetadata> metadataDictionary = new Dictionary <string, ImageMetadata>();
try
{
foreach (Directory metadataDirectory in ImageMetadataReader.ReadMetadata(filePath))
{
// TraceDebug.PrintMessage(String.Format("metadataDirectory is: {0}", metadataDirectory.Name));
foreach (Tag metadataTag in metadataDirectory.Tags)
{
ImageMetadata metadata = new ImageMetadata(metadataTag.DirectoryName, metadataTag.Name, metadataTag.Description);
// Check if the metadata name is already in the dictionary.
// If so, just skip it as its not clear what else to do with it
// Note that Quicktime mp4s appear to have multiple directories called Quicktime Track Headers.
// Exiftool seems to handle this properly but MetadataDetector generates duplicates.
// So only the first Quicktime track header is added to the dictionary.
if (!metadataDictionary.ContainsKey(metadata.Key))
{
metadataDictionary.Add(metadata.Key, metadata);
}
else
{
TracePrint.PrintMessage(String.Format("ImageMetadata Dictionary: Duplicate metadata key: {0}:{1} (Note that Quicktime may have multiple Track Headers)", metadataDirectory.Name, metadata.Key));
}
}
}
}
catch
{
// Likely a corrupt file, Just return the empty dictionary
metadataDictionary.Clear();
}
return(metadataDictionary);
}