public void CanDrawRoundRectDifference()
{
using var outer = new SKRoundRect(SKRect.Create(50, 50, 200, 200), 20);
using var inner = new SKRoundRect(SKRect.Create(100, 100, 100, 100), 20);
using var paint = new SKPaint();
SKColor[] diff;
using (var bmp = new SKBitmap(new SKImageInfo(300, 300)))
using (var canvas = new SKCanvas(bmp))
{
canvas.Clear(SKColors.Transparent);
canvas.DrawRoundRectDifference(outer, inner, paint);
diff = bmp.Pixels;
}
SKColor[] paths;
using (var bmp = new SKBitmap(new SKImageInfo(300, 300)))
using (var canvas = new SKCanvas(bmp))
using (var path = new SKPath())
{
canvas.Clear(SKColors.Transparent);
path.AddRoundRect(outer);
path.AddRoundRect(inner);
path.FillType = SKPathFillType.EvenOdd;
canvas.DrawPath(path, paint);
paths = bmp.Pixels;
}
Assert.Equal(paths, diff);
}
/// <inheritdoc />
public void DrawRectangle(IBrush brush, IPen pen, RoundedRect rect, BoxShadows boxShadows = default)
{
if (rect.Rect.Height <= 0 || rect.Rect.Width <= 0)
{
return;
}
// Arbitrary chosen values
// On OSX Skia breaks OpenGL context when asked to draw, e. g. (0, 0, 623, 6666600) rect
if (rect.Rect.Height > 8192 || rect.Rect.Width > 8192)
{
boxShadows = default;
}
var rc = rect.Rect.ToSKRect();
var isRounded = rect.IsRounded;
var needRoundRect = rect.IsRounded || (boxShadows.HasInsetShadows);
using var skRoundRect = needRoundRect ? new SKRoundRect() : null;
if (needRoundRect)
{
skRoundRect.SetRectRadii(rc,
new[]
{
rect.RadiiTopLeft.ToSKPoint(), rect.RadiiTopRight.ToSKPoint(),
rect.RadiiBottomRight.ToSKPoint(), rect.RadiiBottomLeft.ToSKPoint(),
});
}
foreach (var boxShadow in boxShadows)
{
if (!boxShadow.IsEmpty && !boxShadow.IsInset)
{
using (var shadow = BoxShadowFilter.Create(_boxShadowPaint, boxShadow, _currentOpacity))
{
var spread = (float)boxShadow.Spread;
if (boxShadow.IsInset)
{
spread = -spread;
}
Canvas.Save();
if (isRounded)
{
using var shadowRect = new SKRoundRect(skRoundRect);
if (spread != 0)
{
shadowRect.Inflate(spread, spread);
}
Canvas.ClipRoundRect(skRoundRect,
shadow.ClipOperation, true);
var oldTransform = Transform;
Transform = oldTransform * Matrix.CreateTranslation(boxShadow.OffsetX, boxShadow.OffsetY);
Canvas.DrawRoundRect(shadowRect, shadow.Paint);
Transform = oldTransform;
}
else
{
var shadowRect = rc;
if (spread != 0)
{
shadowRect.Inflate(spread, spread);
}
Canvas.ClipRect(rc, shadow.ClipOperation);
var oldTransform = Transform;
Transform = oldTransform * Matrix.CreateTranslation(boxShadow.OffsetX, boxShadow.OffsetY);
Canvas.DrawRect(shadowRect, shadow.Paint);
Transform = oldTransform;
}
Canvas.Restore();
}
}
}
if (brush != null)
{
using (var paint = CreatePaint(_fillPaint, brush, rect.Rect.Size))
{
if (isRounded)
{
Canvas.DrawRoundRect(skRoundRect, paint.Paint);
}
else
{
Canvas.DrawRect(rc, paint.Paint);
}
}
}
foreach (var boxShadow in boxShadows)
{
if (!boxShadow.IsEmpty && boxShadow.IsInset)
{
using (var shadow = BoxShadowFilter.Create(_boxShadowPaint, boxShadow, _currentOpacity))
{
var spread = (float)boxShadow.Spread;
var offsetX = (float)boxShadow.OffsetX;
var offsetY = (float)boxShadow.OffsetY;
var outerRect = AreaCastingShadowInHole(rc, (float)boxShadow.Blur, spread, offsetX, offsetY);
Canvas.Save();
using var shadowRect = new SKRoundRect(skRoundRect);
if (spread != 0)
{
shadowRect.Deflate(spread, spread);
}
Canvas.ClipRoundRect(skRoundRect,
shadow.ClipOperation, true);
var oldTransform = Transform;
Transform = oldTransform * Matrix.CreateTranslation(boxShadow.OffsetX, boxShadow.OffsetY);
using (var outerRRect = new SKRoundRect(outerRect))
Canvas.DrawRoundRectDifference(outerRRect, shadowRect, shadow.Paint);
Transform = oldTransform;
Canvas.Restore();
}
}
}
if (pen?.Brush != null)
{
using (var paint = CreatePaint(_strokePaint, pen, rect.Rect.Size))
{
if (isRounded)
{
Canvas.DrawRoundRect(skRoundRect, paint.Paint);
}
else
{
Canvas.DrawRect(rc, paint.Paint);
}
}
}
}
