static void drawShadowFast(Canvas canvas, Path path, Vector3 zPlaneParams, Vector3 devLightPos,
float lightRadius, uiColor ambientColor, uiColor spotColor, int flags)
{
Matrix3 viewMatrix = canvas.getTotalMatrix();
//debug shadow
#pragma warning disable CS0162
if (debugShadow)
{
var isRRect = path.isNaiveRRect;
if (isRRect)
{
ambientColor = uiColor.fromColor(Colors.red);
spotColor = uiColor.fromColor(Colors.red);
}
else
{
ambientColor = uiColor.fromColor(Colors.green);
spotColor = uiColor.fromColor(Colors.green);
}
}
#pragma warning restore CS0162
//ambient light
float devSpaceOutset = ambientBlurRadius(zPlaneParams.z);
float oneOverA = ambientRecipAlpha(zPlaneParams.z);
float blurRadius = 0.5f * devSpaceOutset * oneOverA;
float strokeWidth = 0.5f * (devSpaceOutset - blurRadius);
_shadowPaint.color = new Color(ambientColor.value);
_shadowPaint.strokeWidth = strokeWidth;
_shadowPaint.style = PaintingStyle.fill;
canvas.drawPath(path, _shadowPaint);
//spot light
float radius = 0.0f;
if (!getSpotShadowTransform(devLightPos, lightRadius, viewMatrix, zPlaneParams, path.getBounds(),
_shadowMatrix, ref radius))
{
return;
}
canvas.save();
canvas.setMatrix(_shadowMatrix);
_shadowPaint.color = new Color(spotColor.value);
_shadowPaint.strokeWidth = 0;
_shadowPaint.style = PaintingStyle.fill;
float sigma2 = convertRadiusToSigma(radius);
_shadowPaint.maskFilter = path.isNaiveRRect ? MaskFilter.fastShadow(sigma2) : MaskFilter.blur(BlurStyle.normal, sigma2);
canvas.drawPath(path, _shadowPaint);
canvas.restore();
_shadowPaint.maskFilter = null;
}
void _drawWithMaskFilter(Rect meshBounds, Action <Paint> drawAction, Paint paint, MaskFilter maskFilter)
{
var layer = this._currentLayer;
var clipBounds = layer.layerBounds;
Rect stackBounds;
bool iior;
layer.clipStack.getBounds(out stackBounds, out iior);
if (stackBounds != null)
{
clipBounds = clipBounds.intersect(stackBounds);
}
if (clipBounds.isEmpty)
{
return;
}
var state = layer.currentState;
float sigma = state.scale * maskFilter.sigma;
if (sigma <= 0)
{
return;
}
float sigma3 = 3 * sigma;
var maskBounds = meshBounds.inflate(sigma3);
maskBounds = maskBounds.intersect(clipBounds.inflate(sigma3));
if (maskBounds.isEmpty)
{
return;
}
var maskLayer = this._createMaskLayer(layer, maskBounds, drawAction, paint);
var blurLayer = this._createBlurLayer(maskLayer, sigma, layer);
var blurMesh = ImageMeshGenerator.imageMesh(null, Rect.one, maskBounds);
if (!this._applyClip(blurMesh.bounds))
{
return;
}
layer.draws.Add(CanvasShader.texRT(layer, paint, blurMesh, blurLayer));
}