/// <inheritdoc/>
protected override void OnApply(ImageBase <TColor> source, Rectangle sourceRectangle)
{
using (PixelAccessor <TColor> sourcePixels = source.Lock())
using (PenApplicator <TColor> applicator = this.Pen.CreateApplicator(sourcePixels, this.Path.Bounds))
{
Rectangle rect = RectangleF.Ceiling(applicator.RequiredRegion);
int polyStartY = rect.Y - PaddingFactor;
int polyEndY = rect.Bottom + PaddingFactor;
int startX = rect.X - PaddingFactor;
int endX = rect.Right + PaddingFactor;
int minX = Math.Max(sourceRectangle.Left, startX);
int maxX = Math.Min(sourceRectangle.Right, endX);
int minY = Math.Max(sourceRectangle.Top, polyStartY);
int maxY = Math.Min(sourceRectangle.Bottom, polyEndY);
// Align start/end positions.
minX = Math.Max(0, minX);
maxX = Math.Min(source.Width, maxX);
minY = Math.Max(0, minY);
maxY = Math.Min(source.Height, maxY);
// Reset offset if necessary.
if (minX > 0)
{
startX = 0;
}
if (minY > 0)
{
polyStartY = 0;
}
Parallel.For(
minY,
maxY,
this.ParallelOptions,
y =>
{
int offsetY = y - polyStartY;
for (int x = minX; x < maxX; x++)
{
// TODO add find intersections code to skip and scan large regions of this.
int offsetX = x - startX;
PointInfo info = this.Path.GetPointInfo(offsetX, offsetY);
ColoredPointInfo <TColor> color = applicator.GetColor(offsetX, offsetY, info);
float opacity = this.Opacity(color.DistanceFromElement);
if (opacity > Constants.Epsilon)
{
Vector4 backgroundVector = sourcePixels[offsetX, offsetY].ToVector4();
Vector4 sourceVector = color.Color.ToVector4();
Vector4 finalColor = Vector4BlendTransforms.PremultipliedLerp(backgroundVector, sourceVector, opacity);
finalColor.W = backgroundVector.W;
TColor packed = default(TColor);
packed.PackFromVector4(finalColor);
sourcePixels[offsetX, offsetY] = packed;
}
}
});
}
}
/// <inheritdoc/>
protected override void OnApply(ImageBase <TPixel> source, Rectangle sourceRectangle)
{
using (PixelAccessor <TPixel> sourcePixels = source.Lock())
using (PenApplicator <TPixel> applicator = this.Pen.CreateApplicator(sourcePixels, this.Path.Bounds, this.Options))
{
Rectangle rect = RectangleF.Ceiling(applicator.RequiredRegion);
int polyStartY = rect.Y - PaddingFactor;
int polyEndY = rect.Bottom + PaddingFactor;
int startX = rect.X - PaddingFactor;
int endX = rect.Right + PaddingFactor;
int minX = Math.Max(sourceRectangle.Left, startX);
int maxX = Math.Min(sourceRectangle.Right, endX);
int minY = Math.Max(sourceRectangle.Top, polyStartY);
int maxY = Math.Min(sourceRectangle.Bottom, polyEndY);
// Align start/end positions.
minX = Math.Max(0, minX);
maxX = Math.Min(source.Width, maxX);
minY = Math.Max(0, minY);
maxY = Math.Min(source.Height, maxY);
// Reset offset if necessary.
if (minX > 0)
{
startX = 0;
}
if (minY > 0)
{
polyStartY = 0;
}
int width = maxX - minX;
PixelBlender <TPixel> blender = PixelOperations <TPixel> .Instance.GetPixelBlender(this.Options.BlenderMode);
Parallel.For(
minY,
maxY,
this.ParallelOptions,
y =>
{
int offsetY = y - polyStartY;
using (Buffer <float> amount = new Buffer <float>(width))
using (Buffer <TPixel> colors = new Buffer <TPixel>(width))
{
for (int i = 0; i < width; i++)
{
int x = i + minX;
int offsetX = x - startX;
PointInfo info = this.Path.GetPointInfo(offsetX, offsetY);
ColoredPointInfo <TPixel> color = applicator.GetColor(offsetX, offsetY, info);
amount[i] = (this.Opacity(color.DistanceFromElement) * this.Options.BlendPercentage).Clamp(0, 1);
colors[i] = color.Color;
}
BufferSpan <TPixel> destination = sourcePixels.GetRowSpan(offsetY).Slice(minX - startX, width);
blender.Blend(destination, destination, colors, amount);
}
});
}
}
