public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
ContentResolver cr = context_.ContentResolver;
/** 画像をファイルパスから検索 */
BitmapFactory.Options options = new BitmapFactory.Options();
options.InJustDecodeBounds = true;
var bitmap = BitmapFactory.DecodeFile(image_[position]);
int imageHeight = bitmap.Height;
int imageWidth = bitmap.Width;
String imageType = options.OutMimeType;
int inSampleSize = 1;
if (imageHeight > 320 || imageWidth > 240)
{
int halfHeight = imageHeight / 2;
int halfWidth = imageWidth / 2;
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) >= 320 &&
(halfWidth / inSampleSize) >= 240)
{
inSampleSize *= 2;
}
}
options.InSampleSize = inSampleSize;
options.InJustDecodeBounds = false;
Android.Media.ExifInterface exif = new Android.Media.ExifInterface(image_[position]);
//var orientation = int.Parse(exif.GetAttribute(Android.Media.ExifInterface.TagOrientation));
var thumbnail = BitmapFactory.DecodeFile(image_[position], options);
Android.Graphics.Matrix mat = new Android.Graphics.Matrix();
if (thumbnail.Width > thumbnail.Height)
{
mat.SetRotate(90, thumbnail.Width / 2, thumbnail.Height / 2);
mat.PreScale(320.0f / thumbnail.Width, 240.0f / thumbnail.Height);
}
else
{
mat.PreScale(240.0f / thumbnail.Width, 320.0f / thumbnail.Height);
}
thumbnail = Android.Graphics.Bitmap.CreateBitmap(thumbnail, 0, 0, thumbnail.Width, thumbnail.Height, mat, true);
((CameraViewHolder)holder).image_.SetImageBitmap(thumbnail);
holder.ItemView.Click -= ItemView_Click;
holder.ItemView.Click += ItemView_Click;
}
private Bitmap Flip(Bitmap source, int sx, int sy)
{
using (Matrix matrix = new Matrix())
{
matrix.PreScale(sx, sy);
Bitmap output = Bitmap.CreateBitmap(source, 0, 0, source.Width, source.Height, matrix, false);
output.Density = (int)DisplayMetricsDensity.Default;
return output;
}
}
private static Bitmap ReverseBitmap(Bitmap src)
{
Android.Graphics.Matrix m = new Android.Graphics.Matrix();
m.PreScale(1, -1);
Bitmap dst = Bitmap.CreateBitmap(src, 0, 0, src.Width, src.Height, m, false);
dst.Density = (int)Android.Util.DisplayMetricsDensity.Default;
return(dst);
}
public static void Prepend(this AG.Matrix dest, Matrix m)
{
dest.PreTranslate((float)m.OffsetX, (float)m.OffsetY);
dest.PreScale((float)m.M11, (float)m.M22);
dest.PreSkew((float)m.M21, (float)m.M12);
}
public void DrawImage(IImage image, Rect frame, double alpha = 1.0)
{
var ii = image as BitmapImage;
if (ii != null)
{
var paint = GetImagePaint(alpha);
var isize = new Size(ii.Bitmap.Width, ii.Bitmap.Height);
var scale = frame.Size/isize;
var m = new Matrix();
m.PreTranslate((float) frame.X, (float) frame.Y);
m.PreScale((float) scale.Width, (float) scale.Height);
graphics.DrawBitmap(ii.Bitmap, m, paint);
}
}
public static Bitmap FlipImage(Bitmap bitmap, bool horizontal, bool vertical)
{
Matrix matrix = new Matrix();
matrix.PreScale(horizontal ? -1 : 1, vertical ? -1 : 1);
return Bitmap.CreateBitmap(bitmap, 0, 0, bitmap.Width, bitmap.Height, matrix, true);
}