/// <summary>
/// ファイルのタイプを確認する
/// </summary>
/// <param name="filePath">確認するファイルパス</param>
/// <returns>メディアタイプ</returns>
private static MediaType CheckMediaType(string filePath)
{
var extension = Path.GetExtension(filePath).ToLower();
if (MediaChecker.CheckPictureExtensions(extension))
{
return(MediaType.Picture);
}
throw new FileFormatException();
}
/// <summary>
/// 画像一覧に表示するサムネイル画像を作成する
/// </summary>
/// <param name="filePath">画像ファイルパス</param>
/// <returns>BitmapSource</returns>
public static BitmapSource CreatePictureThumbnailImage(string filePath)
{
const int LongSideLength = 100;
if (MediaChecker.CheckRawFileExtension(Path.GetExtension(filePath).ToLower()))
{
return(DecodePicture(filePath, LongSideLength));
}
else
{
using var sourceStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
sourceStream.Seek(0, SeekOrigin.Begin);
var bitmapFrame = BitmapFrame.Create(sourceStream);
var metadata = bitmapFrame.Metadata as BitmapMetadata;
var thumbnail = bitmapFrame.Thumbnail;
if (thumbnail != null)
{
// リサイズ処理
var scale = LongSideLength / (double)thumbnail.PixelWidth;
if (thumbnail.PixelWidth < thumbnail.PixelHeight)
{
scale = LongSideLength / (double)thumbnail.PixelHeight;
}
thumbnail = new TransformedBitmap(thumbnail, new ScaleTransform(scale, scale));
// リサイズ後に回転
thumbnail = RotateImage(metadata, thumbnail);
// リサイズ、回転した画像を書き出す
var decodeImage = new WriteableBitmap(thumbnail);
decodeImage.Freeze();
return(decodeImage);
}
else
{
return(DecodePicture(filePath, LongSideLength));
}
}
}
/// <summary>
/// 画像をデコードする
/// </summary>
/// <param name="filePath">画像ファイルパス</param>
/// <param name="longSideLength">長辺の長さ(この長さにあわせて画像がリサイズされる)</param>
/// <returns>BitmapSource</returns>
private static BitmapSource DecodePicture(string filePath, int longSideLength)
{
if (MediaChecker.CheckRawFileExtension(Path.GetExtension(filePath).ToLower()))
{
if (NativeMethods.GetRawThumbnailImageData(filePath, longSideLength, out var imageData) != 0)
{
throw new FileFormatException("File format is wrong.");
}
return(CreateBitmapSourceFromImageStruct(imageData));
}
else
{
if (NativeMethods.GetNormalThumbnailImageData(filePath, longSideLength, out var imageData) != 0)
{
throw new FileFormatException("File format is wrong.");
}
return(CreateBitmapSourceFromImageStruct(imageData));
}
}
/// <summary>
/// ファイルからExif情報を取得してリストに設定する
/// </summary>
/// <param name="filePath">画像のファイルパス</param>
/// <param name="exifDataList">読み込んだExif情報を設定するリスト</param>
public static void SetExifDataFromFile(string filePath, ExifInfo[] exifDataList)
{
var extension = Path.GetExtension(filePath);
var fileExtensionType = MediaChecker.GetFileExtensionType(extension.ToLower());
var directories = GetMetadataDirectories(filePath, fileExtensionType).ToArray();
var subIfdDirectories = directories.OfType <ExifSubIfdDirectory>().ToArray();
foreach (var exifInfo in exifDataList)
{
switch (exifInfo.ExifPropertyType)
{
case PropertyType.FileName:
exifInfo.ExifParameterValue = Path.GetFileName(filePath);
break;
case PropertyType.Date:
exifInfo.ExifParameterValue = GetExifDataFromMetadata(directories, ExifDirectoryBase.TagDateTime);
break;
case PropertyType.CameraModel:
exifInfo.ExifParameterValue = GetExifDataFromMetadata(directories, ExifDirectoryBase.TagModel);
break;
case PropertyType.CameraManufacturer:
exifInfo.ExifParameterValue = GetExifDataFromMetadata(directories, ExifDirectoryBase.TagMake);
break;
case PropertyType.ImageWidth:
exifInfo.ExifParameterValue = MediaChecker.CheckRawFileExtension(extension.ToLower())
? $"{GetExifDataFromMetadata(subIfdDirectories, ExifDirectoryBase.TagImageWidth)} pixel"
: $"{GetExifDataFromMetadata(directories, ExifDirectoryBase.TagExifImageWidth)} pixel";
break;
case PropertyType.ImageHeight:
exifInfo.ExifParameterValue = MediaChecker.CheckRawFileExtension(extension.ToLower())
? $"{GetExifDataFromMetadata(subIfdDirectories, ExifDirectoryBase.TagImageHeight)} pixel"
: $"{GetExifDataFromMetadata(directories, ExifDirectoryBase.TagExifImageHeight)} pixel";
break;
case PropertyType.HorizonResolution:
var horizonResolution = GetExifDataFromMetadata(directories, ExifDirectoryBase.TagXResolution);
exifInfo.ExifParameterValue = !string.IsNullOrEmpty(horizonResolution) ? $"{horizonResolution} dpi" : horizonResolution;
break;
case PropertyType.VerticalResolution:
var verticalResolution = GetExifDataFromMetadata(directories, ExifDirectoryBase.TagYResolution);
exifInfo.ExifParameterValue = !string.IsNullOrEmpty(verticalResolution) ? $"{verticalResolution} dpi" : verticalResolution;
break;
case PropertyType.Bitdepth:
var bitDepth = fileExtensionType switch
{
FileExtensionType.Jpeg => GetExifDataFromMetadata(directories, JpegDirectory.TagDataPrecision),
FileExtensionType.Bmp => GetExifDataFromMetadata(directories, BmpHeaderDirectory.TagBitsPerPixel),
FileExtensionType.Png => GetExifDataFromMetadata(directories, PngDirectory.TagBitsPerSample),
FileExtensionType.Gif => GetExifDataFromMetadata(directories, GifHeaderDirectory.TagBitsPerPixel),
FileExtensionType.Tiff or FileExtensionType.Dng or FileExtensionType.Nef => GetExifDataFromMetadata(directories, ExifDirectoryBase.TagBitsPerSample).AsSpan(0, 1),
FileExtensionType.Unknown => throw new NotImplementedException(),
_ => throw new ArgumentOutOfRangeException(),
};
exifInfo.ExifParameterValue = bitDepth.ToString();
break;
case PropertyType.ShutterSpeed:
var shutterSpeed = GetExifDataFromMetadata(directories, ExifDirectoryBase.TagExposureTime);
exifInfo.ExifParameterValue = !string.IsNullOrEmpty(shutterSpeed) ? $"{shutterSpeed} sec" : shutterSpeed;
break;
case PropertyType.Fnumber:
exifInfo.ExifParameterValue = GetExifDataFromMetadata(directories, ExifDirectoryBase.TagFNumber);
break;
case PropertyType.Iso:
exifInfo.ExifParameterValue = GetExifDataFromMetadata(directories, ExifDirectoryBase.TagIsoEquivalent);
break;
case PropertyType.FocalLength:
var focalLength = GetExifDataFromMetadata(directories, ExifDirectoryBase.Tag35MMFilmEquivFocalLength);
exifInfo.ExifParameterValue = !string.IsNullOrEmpty(focalLength) ? $"{focalLength} mm" : focalLength;
break;
case PropertyType.ExposureProgram:
var exposureProgram = GetExifDataFromMetadata(directories, ExifDirectoryBase.TagExposureProgram);
exifInfo.ExifParameterValue = !string.IsNullOrEmpty(exposureProgram) ? Enum.Parse <ExposureProgramType>(exposureProgram).ToString() : exposureProgram;
break;
case PropertyType.WhiteBalance:
var whiteBalance = GetExifDataFromMetadata(directories, ExifDirectoryBase.TagWhiteBalance);
exifInfo.ExifParameterValue = !string.IsNullOrEmpty(whiteBalance) ? Enum.Parse <WhiteBalanceType>(whiteBalance).ToString() : whiteBalance;
break;
case PropertyType.MeteringMode:
var meteringMode = GetExifDataFromMetadata(directories, ExifDirectoryBase.TagMeteringMode);
exifInfo.ExifParameterValue = !string.IsNullOrEmpty(meteringMode) ? Enum.Parse <MeteringModeType>(meteringMode).ToString() : meteringMode;
break;
default:
throw new ArgumentOutOfRangeException();
}
}
}
