public async Task <byte[]> ExportCurrentImage(int width, int height, float scale, List <Abstractions.Stroke> strokes, Abstractions.Scaling scaling, Abstractions.ExportFormat format, int quality, Painter.Abstractions.Color BackgroundColor, bool useDevicePixelDensity, byte[] BackgroundImage = null)
{
if (scale == 0)
{
scale = 1.0f;
}
//Initialize data holders
byte[] data;
Stream str = new MemoryStream();
if (useDevicePixelDensity)
{
width *= (int)metrics.Density;
height *= (int)metrics.Density;
}
Bitmap tempImage = null;
Bitmap backgroundBitmap = null;
Canvas tempCanvas = null;
if (BackgroundImage == null)
{
tempImage = Bitmap.CreateBitmap(metrics, width, height, Bitmap.Config.Argb8888);
tempCanvas = new Canvas(tempImage);
}
else
{
backgroundBitmap = await BitmapFactory.DecodeByteArrayAsync(BackgroundImage, 0, BackgroundImage.Length);
var backgroundScale = GetDrawingScale(scaling, backgroundBitmap, width, height);
tempImage = Bitmap.CreateBitmap(metrics, (int)Math.Min(width, backgroundBitmap.Width * backgroundScale), (int)Math.Min(height, backgroundBitmap.Height * backgroundScale), Bitmap.Config.Argb8888);
tempCanvas = new Canvas(tempImage);
}
DrawStrokes(tempCanvas, strokes, backgroundBitmap, BackgroundColor, scaling, width, height, scale);
//Compress the image and save it to the stream
switch (format)
{
case Abstractions.ExportFormat.Png:
await tempImage.CompressAsync(CompressFormat.Png, quality, str);
break;
case Abstractions.ExportFormat.Jpeg:
await tempImage.CompressAsync(CompressFormat.Jpeg, quality, str);
break;
}
//Memory management
tempImage.Dispose();
tempCanvas.Dispose();
tempImage = null;
tempCanvas = null;
//Read the data
data = new byte[str.Length];
str.Seek(0, SeekOrigin.Begin);
await str.ReadAsync(data, 0, (int)str.Length);
//Return the data
return(data);
}
public async Task <byte[]> ExportCurrentImage(int width, int height, float scale, List <Abstractions.Stroke> strokes, Abstractions.Scaling scaling, Abstractions.ExportFormat format, int quality, Painter.Abstractions.Color BackgroundColor, bool useDevicePixelDensity, byte[] BackgroundImage = null)
{
//useDevicePixelDensity is not used on iOS
UIImage image = drawPath(width, height, strokes);
NSData imageData;
if (format == Abstractions.ExportFormat.Png)
{
imageData = image.AsPNG();
}
else
{
imageData = image.AsJPEG(quality);
}
return(imageData.ToArray());
}