public void ResizeImage(string sourceFile, string targetFile, float maxWidth, float maxHeight)
{
if (!File.Exists(targetFile) && File.Exists(sourceFile))
{
// First decode with inJustDecodeBounds=true to check dimensions
var options = new BitmapFactory.Options()
{
InJustDecodeBounds = false,
InPurgeable = true,
};
using (var image = BitmapFactory.DecodeFile(sourceFile, options))
{
if (image != null)
{
var sourceSize = new Size((int)image.GetBitmapInfo().Height, (int)image.GetBitmapInfo().Width);
var maxResizeFactor = Math.Min(maxWidth / sourceSize.Width, maxHeight / sourceSize.Height);
string targetDir = System.IO.Path.GetDirectoryName(targetFile);
if (!Directory.Exists(targetDir))
{
Directory.CreateDirectory(targetDir);
}
if (maxResizeFactor > 0.9)
{
File.Copy(sourceFile, targetFile);
}
else
{
var width = (int)(maxResizeFactor * sourceSize.Width);
var height = (int)(maxResizeFactor * sourceSize.Height);
using (var bitmapScaled = Bitmap.CreateScaledBitmap(image, height, width, true))
{
using (Stream outStream = File.Create(targetFile))
{
if (targetFile.ToLower().EndsWith("png"))
{
bitmapScaled.Compress(Bitmap.CompressFormat.Png, 100, outStream);
}
else
{
bitmapScaled.Compress(Bitmap.CompressFormat.Jpeg, 95, outStream);
}
}
bitmapScaled.Recycle();
}
}
image.Recycle();
}
else
{
Log.Error("Error", "String", "Image scaling failed: " + sourceFile);
}
}
}
}
public IBitmapImplementation Rescale(int newWidth, int newHeight)
{
return(new BitmapImplementation(
AndroidBitmap.CreateScaledBitmap(
Bitmap,
newWidth,
newHeight,
filter: true)));
}
