public CanvasCommandList GetCanvasImage(ICanvasResourceCreator resourceCreator, float scaleX, float scaleY)
{
lock (this)
{
var commandList = new CanvasCommandList(resourceCreator);
using (var session = commandList.CreateDrawingSession())
{
var width = _composition.Bounds.Width * scaleX;
var height = _composition.Bounds.Height * scaleY;
if (_bitmapCanvas == null || _bitmapCanvas.Width < width || _bitmapCanvas.Height < height)
{
_bitmapCanvas?.Dispose();
_bitmapCanvas = new BitmapCanvas(width, height);
}
using (_bitmapCanvas.CreateSession(resourceCreator.Device, (float)width,
(float)height, session))
{
_bitmapCanvas.Clear(Colors.Transparent);
LottieLog.BeginSection("Drawable.Draw");
if (_compositionLayer == null)
{
return(null);
}
_matrix.Reset();
_matrix = MatrixExt.PreScale(_matrix, scaleX, scaleY);
_compositionLayer.Draw(_bitmapCanvas, _matrix, _alpha);
LottieLog.EndSection("Drawable.Draw");
}
}
return(commandList);
}
}
//public int Opacity
//{
// get
// {
// return PixelFormat.TRANSLUCENT;
// }
//}
private void CanvasControlOnDraw(ICanvasAnimatedControl canvasControl, CanvasAnimatedDrawEventArgs args)
{
lock (this)
{
using (_bitmapCanvas.CreateSession(canvasControl.Device, canvasControl.Size.Width, canvasControl.Size.Height, args.DrawingSession))
{
_bitmapCanvas.Clear(Colors.Transparent);
LottieLog.BeginSection("Drawable.Draw");
if (_compositionLayer == null)
{
return;
}
var scale = _scale;
float extraScale = 1f;
float maxScale = GetMaxScale(_bitmapCanvas);
if (scale > maxScale)
{
scale = maxScale;
extraScale = _scale / scale;
}
if (extraScale > 1)
{
// This is a bit tricky...
// We can't draw on a canvas larger than ViewConfiguration.get(context).getScaledMaximumDrawingCacheSize()
// which works out to be roughly the size of the screen because Android can't generate a
// bitmap large enough to render to.
// As a result, we cap the scale such that it will never be wider/taller than the screen
// and then only render in the top left corner of the canvas. We then use extraScale
// to scale up the rest of the scale. However, since we rendered the animation to the top
// left corner, we need to scale up and translate the canvas to zoom in on the top left
// corner.
_bitmapCanvas.Save();
float halfWidth = (float)_composition.Bounds.Width / 2f;
float halfHeight = (float)_composition.Bounds.Height / 2f;
float scaledHalfWidth = halfWidth * scale;
float scaledHalfHeight = halfHeight * scale;
_bitmapCanvas.Translate(
Scale * halfWidth - scaledHalfWidth,
Scale * halfHeight - scaledHalfHeight);
_bitmapCanvas.Scale(extraScale, extraScale, scaledHalfWidth, scaledHalfHeight);
}
_matrix.Reset();
_matrix = MatrixExt.PreScale(_matrix, scale, scale);
_compositionLayer.Draw(_bitmapCanvas, _matrix, _alpha);
LottieLog.EndSection("Drawable.Draw");
if (extraScale > 1)
{
_bitmapCanvas.Restore();
}
}
}
}
private static void Draw(CanvasDevice device, BitmapCanvas bitmapCanvas, CompositionLayer compositionLayer, Rect bounds, float scale, byte alpha, Matrix3X3 matrix, double width, double height, CanvasDrawingSession canvasDrawingSession)
{
using (bitmapCanvas.CreateSession(device, width, height, canvasDrawingSession))
{
bitmapCanvas.Clear(Colors.Transparent);
LottieLog.BeginSection("Drawable.Draw");
if (compositionLayer == null)
{
return;
}
var localScale = scale;
float extraScale = 1f;
float maxScale = GetMaxScale(bitmapCanvas, bounds);
if (localScale > maxScale)
{
localScale = maxScale;
extraScale = scale / localScale;
}
if (extraScale > 1)
{
// This is a bit tricky...
// We can't draw on a canvas larger than ViewConfiguration.get(context).getScaledMaximumDrawingCacheSize()
// which works out to be roughly the size of the screen because Android can't generate a
// bitmap large enough to render to.
// As a result, we cap the scale such that it will never be wider/taller than the screen
// and then only render in the top left corner of the canvas. We then use extraScale
// to scale up the rest of the scale. However, since we rendered the animation to the top
// left corner, we need to scale up and translate the canvas to zoom in on the top left
// corner.
bitmapCanvas.Save();
float halfWidth = (float)bounds.Width / 2f;
float halfHeight = (float)bounds.Height / 2f;
float scaledHalfWidth = halfWidth * localScale;
float scaledHalfHeight = halfHeight * localScale;
bitmapCanvas.Translate(
scale * halfWidth - scaledHalfWidth,
scale * halfHeight - scaledHalfHeight);
bitmapCanvas.Scale(extraScale, extraScale, scaledHalfWidth, scaledHalfHeight);
}
matrix.Reset();
matrix = MatrixExt.PreScale(matrix, localScale, localScale);
compositionLayer.Draw(bitmapCanvas, matrix, alpha);
LottieLog.EndSection("Drawable.Draw");
if (extraScale > 1)
{
bitmapCanvas.Restore();
}
}
}
//public int Opacity
//{
// get
// {
// return PixelFormat.TRANSLUCENT;
// }
//}
private void CanvasControlOnDraw(ICanvasAnimatedControl canvasControl, CanvasAnimatedDrawEventArgs args)
{
lock (this)
{
using (_bitmapCanvas.CreateSession(canvasControl.Device, canvasControl.Size.Width, canvasControl.Size.Height, args.DrawingSession))
{
_bitmapCanvas.Clear(Colors.Transparent);
LottieLog.BeginSection("Drawable.Draw");
if (_compositionLayer == null)
{
return;
}
var scale = _scale;
float extraScale = 1f;
var hasExtraScale = false;
float maxScale = GetMaxScale(_bitmapCanvas);
if (_compositionLayer.HasMatte() || _compositionLayer.HasMasks())
{
// Since we can only scale up the animation so much before masks and mattes get clipped, we
// may have to scale the canvas to fake the rest. This isn't a problem for software rendering
// but hardware accelerated scaling is rasterized so it will appear pixelated.
extraScale = scale / maxScale;
scale = Math.Min(scale, maxScale);
// This check fixes some floating point rounding issues.
hasExtraScale = extraScale > 1.001f;
}
if (hasExtraScale)
{
_bitmapCanvas.Save();
// This is extraScale ^2 because what happens is when the scale increases, the intrinsic size
// of the view increases. That causes the drawable to keep growing even though we are only
// rendering to the size of the view in the top left quarter, leaving the rest blank.
// The first scale by extraScale scales up the canvas so that we are back at the original
// size. The second extraScale is what actually has the scaling effect.
float extraScaleSquared = extraScale * extraScale;
int px = (int)(_composition.Bounds.Width * scale / 2f);
int py = (int)(_composition.Bounds.Height * scale / 2f);
_bitmapCanvas.Scale(extraScaleSquared, extraScaleSquared, px, py);
}
_matrix.Reset();
_matrix = MatrixExt.PreScale(_matrix, scale, scale);
_compositionLayer.Draw(_bitmapCanvas, _matrix, _alpha);
if (hasExtraScale)
{
_bitmapCanvas.Restore();
}
LottieLog.EndSection("Drawable.Draw");
}
}
}
