/// <summary>
/// Calculates a translate based on a <see cref="TileBrush"/>, a source and destination
/// rectangle and a scale.
/// </summary>
/// <param name="brush">The brush.</param>
/// <param name="sourceRect">The source rectangle.</param>
/// <param name="destinationRect">The destination rectangle.</param>
/// <param name="scale">The scale factor.</param>
/// <returns>A vector with the X and Y translate.</returns>
protected static Vector CalculateTranslate(
TileBrush brush,
Rect sourceRect,
Rect destinationRect,
Vector scale)
{
var x = 0.0;
var y = 0.0;
var size = sourceRect.Size * scale;
switch (brush.AlignmentX)
{
case AlignmentX.Center:
x += (destinationRect.Width - size.Width) / 2;
break;
case AlignmentX.Right:
x += destinationRect.Width - size.Width;
break;
}
switch (brush.AlignmentY)
{
case AlignmentY.Center:
y += (destinationRect.Height - size.Height) / 2;
break;
case AlignmentY.Bottom:
y += destinationRect.Height - size.Height;
break;
}
return new Vector(x, y);
}
public static SurfacePattern CreateTileBrush(TileBrush brush, Size targetSize)
{
var helper = new TileBrushImplHelper(brush, targetSize);
if (!helper.IsValid)
return null;
using (var intermediate = new ImageSurface(Format.ARGB32, (int)helper.IntermediateSize.Width, (int)helper.IntermediateSize.Height))
using (var ctx = new RenderTarget(intermediate).CreateDrawingContext())
{
helper.DrawIntermediate(ctx);
var result = new SurfacePattern(intermediate);
if ((brush.TileMode & TileMode.FlipXY) != 0)
{
// TODO: Currently always FlipXY as that's all cairo supports natively.
// Support separate FlipX and FlipY by drawing flipped images to intermediate
// surface.
result.Extend = Extend.Reflect;
}
else
{
result.Extend = Extend.Repeat;
}
if (brush.TileMode != TileMode.None)
{
var matrix = result.Matrix;
matrix.InitTranslate(-helper.DestinationRect.X, -helper.DestinationRect.Y);
result.Matrix = matrix;
}
return result;
}
}
private static BitmapBrushProperties GetBitmapBrushProperties(TileBrush brush)
{
var tileMode = brush.TileMode;
return new BitmapBrushProperties
{
ExtendModeX = GetExtendModeX(tileMode),
ExtendModeY = GetExtendModeY(tileMode),
};
}
private static BrushProperties GetBrushProperties(TileBrush brush, Rect destinationRect)
{
return new BrushProperties
{
Opacity = (float)brush.Opacity,
Transform = brush.TileMode != TileMode.None ?
SharpDX.Matrix3x2.Translation(
(float)destinationRect.X,
(float)destinationRect.Y) :
SharpDX.Matrix3x2.Identity,
};
}
private static BrushProperties GetBrushProperties(TileBrush brush, Rect destinationRect)
{
var tileTransform =
brush.TileMode != TileMode.None ?
Matrix.CreateTranslation(destinationRect.X, destinationRect.Y) :
Matrix.Identity;
return new BrushProperties
{
Opacity = (float)brush.Opacity,
Transform = tileTransform.ToDirect2D(),
};
}
public TileBrushImpl(
TileBrush brush,
SharpDX.Direct2D1.RenderTarget target,
Size targetSize)
{
var helper = new TileBrushImplHelper(brush, targetSize);
if (!helper.IsValid)
return;
using (var intermediate = new BitmapRenderTarget(target, CompatibleRenderTargetOptions.None, helper.IntermediateSize.ToSharpDX()))
{
using (var ctx = new RenderTarget(intermediate).CreateDrawingContext())
helper.DrawIntermediate(ctx);
PlatformBrush = new BitmapBrush(
target,
intermediate.Bitmap,
GetBitmapBrushProperties(brush),
GetBrushProperties(brush, helper.DestinationRect));
}
}
