internal void DrawImage(
global::Android.Graphics.Bitmap nativeBitmap,
Rectangle destinationRectangle,
Color tint)
{
if (null == nativeBitmap)
{
throw new ArgumentNullException(nameof(nativeBitmap));
}
var destinationRect = this.ToNativeRectFPixels(destinationRectangle);
var paint = new Paint()
{
AntiAlias = true,
};
LightingColorFilter colorFilter = null;
if ((!tint.IsTransparent) && (tint != Colors.White))
{
colorFilter = new LightingColorFilter(tint.ToAndroidColor(), 1);
paint.SetColorFilter(colorFilter);
}
this._canvas.DrawBitmap(nativeBitmap, null, destinationRect, paint);
paint.Dispose();
colorFilter?.Dispose();
}
protected override void OnAttached()
{
try
{
var effect = (FormsTintImageEffect)Element.Effects.FirstOrDefault(e => e is FormsTintImageEffect);
if (effect == null || !(Control is ImageView image))
{
return;
}
if (effect.TintColor.ToAndroid() == Android.Graphics.Color.Transparent)
{
image.ClearColorFilter();
return;
}
var filter = new LightingColorFilter(effect.TintColor.ToAndroid(), 0x000000);
image.SetColorFilter(filter);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(
$"An error occurred when setting the {typeof(TintImageEffect)} effect: {ex.Message}\n{ex.StackTrace}");
}
}
private Bitmap LightenBitmap(Bitmap bitmap)
{
Canvas canvas = new Canvas(bitmap);
Paint p = new Paint();
ColorFilter filter = new LightingColorFilter(unchecked ((int)0xFFFFFFFF), 0x00333333); // lighten
p.Color = Color.White;
p.SetColorFilter(filter);
canvas.DrawBitmap(bitmap, new Matrix(), p);
return(bitmap);
}
public static Bitmap ChangeImageColor(Bitmap sourceBitmap, Color color)
{
Bitmap temp = Bitmap.CreateBitmap(sourceBitmap, 0, 0,
sourceBitmap.Width, sourceBitmap.Height);
Bitmap resultBitmap = temp.Copy(Bitmap.Config.Argb8888, true);
Paint p = new Paint();
ColorFilter filter = new LightingColorFilter(color.ToArgb(), 0);
p.SetColorFilter(filter);
Canvas canvas = new Canvas(resultBitmap);
canvas.DrawBitmap(resultBitmap, 0, 0, p);
return(resultBitmap);
}
