private void DrawTextGlyphs(DocumentData documentData, Matrix3X3 parentMatrix, Font font, BitmapCanvas canvas)
{
var fontScale = (float)documentData.Size / 100;
var parentScale = Utils.GetScale(parentMatrix);
var text = documentData.Text;
for (var i = 0; i < text.Length; i++)
{
var c = text[i];
var characterHash = FontCharacter.HashFor(c, font.Family, font.Style);
if (!_composition.Characters.TryGetValue(characterHash, out var character))
{
// Something is wrong. Potentially, they didn't export the text as a glyph.
continue;
}
DrawCharacterAsGlyph(character, parentMatrix, fontScale, documentData, canvas);
var tx = (float)character.Width * fontScale * _composition.DpScale * parentScale;
// Add tracking
var tracking = documentData.Tracking / 10f;
if (_trackingAnimation?.Value != null)
{
tracking += _trackingAnimation.Value.Value;
}
tx += tracking * parentScale;
canvas.Translate(tx, 0);
}
}
private void DrawTextWithFont(DocumentData documentData, Font font, Matrix3X3 parentMatrix, BitmapCanvas canvas)
{
var parentScale = Utils.GetScale(parentMatrix);
var typeface = _lottieDrawable.GetTypeface(font.Family, font.Style);
if (typeface == null)
{
return;
}
var text = documentData.Text;
var textDelegate = _lottieDrawable.TextDelegate;
if (textDelegate != null)
{
text = textDelegate.GetTextInternal(text);
}
_fillPaint.Typeface = typeface;
_fillPaint.TextSize = documentData.Size * _composition.DpScale;
_strokePaint.Typeface = _fillPaint.Typeface;
_strokePaint.TextSize = _fillPaint.TextSize;
for (var i = 0; i < text.Length; i++)
{
var character = text[i];
var size = DrawCharacterFromFont(character, documentData, canvas);
// Add tracking
var tracking = documentData.Tracking / 10f;
if (_trackingAnimation?.Value != null)
{
tracking += _trackingAnimation.Value.Value;
}
var tx = (float)size.Width + tracking * parentScale;
canvas.Translate(tx, 0);
}
}
//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();
}
}
}