private static void RotateDimension(float width, float height, MediaFileImageOrientation originalOrientation, MediaFileImageOrientation orientationDest, out float w, out float h)
{
var retW = width;
var retH = height;
Action rotate = () =>
{
var wT = retW;
retW = retH;
retH = wT;
};
switch (originalOrientation)
{
case MediaFileImageOrientation.Left:
case MediaFileImageOrientation.LeftMirrored:
case MediaFileImageOrientation.Right:
case MediaFileImageOrientation.RightMirrored:
rotate();
break;
}
switch (orientationDest)
{
case MediaFileImageOrientation.Left:
case MediaFileImageOrientation.LeftMirrored:
case MediaFileImageOrientation.Right:
case MediaFileImageOrientation.RightMirrored:
rotate();
break;
}
w = retW;
h = retH;
}
internal override void LoadCursor(ICursor cursor, MediaAssetQueryHelper helper)
{
base.LoadCursor(cursor, helper);
if (helper.DateTakenColumn > -1)
{
TakenDate = DateTimeOffset.FromUnixTimeMilliseconds(cursor.GetLong(helper.DateTakenColumn)).DateTime;
}
if (helper.WidthColumn > -1)
{
Width = cursor.GetInt(helper.WidthColumn);
}
if (helper.HeightColumn > -1)
{
Height = cursor.GetInt(helper.HeightColumn);
}
if (helper.LatitudeColumn > -1)
{
Latitude = cursor.GetDouble(helper.LatitudeColumn);
}
if (helper.LongitudeColumn > -1)
{
Longitude = cursor.GetDouble(helper.LongitudeColumn);
}
if (helper.OrientationColumn > -1)
{
switch (cursor.GetInt(helper.OrientationColumn))
{
case 90:
Orientation = MediaFileImageOrientation.Left;
break;
case 180:
Orientation = MediaFileImageOrientation.Down;
break;
case 270:
Orientation = MediaFileImageOrientation.Right;
break;
default:
Orientation = MediaFileImageOrientation.Up;
break;
}
}
}
private static Bitmap ApplyImageOptions(Bitmap img, MediaFileImageOrientation originalOrientation, MediaFileGetImageOptions options, float w, float h)
{
RotateDimension(w, h, originalOrientation, options.Orientation, out w, out h);
if (w <= 0)
{
if (h > 0)
{
w = img.Width * h / img.Height;
}
else
{
w = img.Width;
}
}
if (h <= 0)
{
h = img.Height * w / img.Width;
}
GetResizeDimensions(img.Width, img.Height, w, h, options.ResizeAspect, out var widthDest, out var heightDest, out var x, out var y, out w, out h);
if (img.Width != widthDest ||
img.Height != heightDest)
{
var newImg = Bitmap.CreateScaledBitmap(img, (int)widthDest, (int)heightDest, false);
img.Dispose();
img = newImg;
}
var matrix = GetOrientationMatrix(originalOrientation, options.Orientation);
if (matrix != null ||
x != 0 ||
y != 0 ||
w != img.Width ||
h != img.Height)
{
var newImg = Bitmap.CreateBitmap(img, (int)x, (int)y, (int)w, (int)h, matrix, false);
img.Dispose();
return(newImg);
}
return(img);
}
private static Matrix GetOrientationMatrix(MediaFileImageOrientation originalOrientation, MediaFileImageOrientation orientationDest)
{
var rotation = 0f;
var scaleX = 1f;
var scaleY = 1f;
switch (originalOrientation)
{
case MediaFileImageOrientation.Down:
rotation = 180f;
break;
case MediaFileImageOrientation.Left:
rotation = 90f;
break;
case MediaFileImageOrientation.Right:
rotation = 270f;
break;
}
if (orientationDest != MediaFileImageOrientation.Up)
{
switch (orientationDest)
{
case MediaFileImageOrientation.Up:
break;
case MediaFileImageOrientation.UpMirrored:
scaleX = -1f;
break;
case MediaFileImageOrientation.Down:
rotation += 180f;
break;
case MediaFileImageOrientation.DownMirrored:
rotation += 180f;
scaleX = -1f;
break;
case MediaFileImageOrientation.Left:
rotation += 270f;
break;
case MediaFileImageOrientation.LeftMirrored:
rotation += 270f;
scaleY = -1f;
break;
case MediaFileImageOrientation.Right:
rotation += 90f;
break;
case MediaFileImageOrientation.RightMirrored:
rotation += 90f;
scaleY = -1f;
break;
default:
break;
}
}
Matrix matrix = null;
if (rotation != 0f)
{
matrix = new Matrix();
matrix.PostRotate(rotation);
}
if (scaleX != 1f || scaleY != 1f)
{
matrix = matrix ?? new Matrix();
matrix.PostScale(scaleX, scaleY);
}
return(matrix);
}