private void ApplyTransform(ITransform transform, IXGraphics xGraphics)
{
if (transform is IRotateTransform rotateTransform)
{
skCanvas.RotateDegrees((float)rotateTransform.Angle, (float)rotateTransform.CenterX,
(float)rotateTransform.CenterY);
}
else if (transform is IScaleTransform scaleTransform)
{
skCanvas.Scale((float)scaleTransform.ScaleX, (float)scaleTransform.ScaleY,
(float)scaleTransform.CenterX, (float)scaleTransform.CenterY);
}
else if (transform is ITranslateTransform translateTransform)
{
skCanvas.Translate((float)translateTransform.X, (float)translateTransform.Y);
}
else if (transform is ITransformGroup transformGroup)
{
foreach (ITransform childTransform in transformGroup.Children)
{
ApplyTransform(childTransform, xGraphics);
}
}
else
{
throw new InvalidOperationException($"Unknown transform type {transform.GetType()}");
}
}
public override void RenderToBuffer(IXGraphics xGraphics, IntPtr pixels, int width, int height, int rowBytes)
{
var info = new SKImageInfo(width, height, SKImageInfo.PlatformColorType, SKAlphaType.Premul);
using (SKSurface surface = SKSurface.Create(info, pixels, rowBytes))
{
// Paint all elements from the canvas on the surface
new SkiaPainter(surface).Paint(xGraphics);
}
}
public void Paint(IXGraphics xGraphics)
{
IBrush?background = xGraphics.Background;
if (background is ISolidColorBrush solidColorBrush)
{
skCanvas.Clear(ToSkiaColor(solidColorBrush.Color));
}
else
{
skCanvas.Clear(SKColors.Transparent);
}
ITransform?xGraphicsRenderTransform = xGraphics.GraphicsRenderTransform;
if (xGraphicsRenderTransform != null)
{
ApplyTransform(xGraphicsRenderTransform, xGraphics);
}
foreach (IGraphicsElement graphicsElement in xGraphics.Children)
{
ITransform?renderTransform = graphicsElement.RenderTransform;
if (renderTransform != null)
{
skCanvas.Save();
ApplyTransform(renderTransform, graphicsElement);
}
if (graphicsElement is IPath path)
{
PaintPath(path);
}
else if (graphicsElement is IShape shape)
{
SKPath skiaPath = NonPathShapeToSkiaPath(shape);
PaintSkiaPath(skiaPath, shape);
}
else
{
throw new InvalidOperationException($"Unknown graphics element type {graphicsElement.GetType()}");
}
if (renderTransform != null)
{
skCanvas.Restore();
}
}
}
/// <summary>
/// Render the graphics to the specified bitmap memory buffer.
/// </summary>
/// <param name="xGraphics">graphics object to render</param>
/// <param name="pixels">buffer data</param>
/// <param name="width">width of the bitmap, in pixels</param>
/// <param name="height">height of the bitmap, in pixels</param>
/// <param name="rowBytes">number of bytes per row in the buffer</param>
public abstract void RenderToBuffer(IXGraphics xGraphics, IntPtr pixels, int width, int height,
int rowBytes);
