/// <summary>
/// Gets the final pixel color for the given point, taking layers, opacity, and blend modes into account.
/// </summary>
public ColorBgra GetComputedPixel(int x, int y)
{
var pixel = ColorBgra.Zero;
foreach (var layer in GetLayersToPaint())
{
var blend_op = UserBlendOps.GetBlendOp(layer.BlendMode, layer.Opacity);
pixel = blend_op.Apply(pixel, layer.Surface.GetColorBgra(x, y));
}
return(pixel);
}
public ImageSurface GetFlattenedImage()
{
// Create a new image surface
var surf = new Cairo.ImageSurface(Cairo.Format.Argb32, ImageSize.Width, ImageSize.Height);
// Blend each visible layer onto our surface
foreach (var layer in GetLayersToPaint())
{
var blendop = UserBlendOps.GetBlendOp(layer.BlendMode, layer.Opacity);
blendop.Apply(surf, layer.Surface);
}
surf.MarkDirty();
return(surf);
}
// Flatten current layer
public void MergeCurrentLayerDown()
{
if (current_layer == 0)
{
throw new InvalidOperationException("Cannot flatten layer because current layer is the bottom layer.");
}
// Get our source and destination layers
var source = CurrentUserLayer;
var dest = UserLayers[current_layer - 1];
// Blend the layers
var blendop = UserBlendOps.GetBlendOp(source.BlendMode, source.Opacity);
blendop.Apply(dest.Surface, source.Surface);
DeleteCurrentLayer();
}