将曲面转换回Pixbuf

Question

我有以下在Pixbuf上绘制的代码

private Pixbuf drawOnPixbuf(Pixbuf original)
{
    Surface surface = new ImageSurface(Format.Argb32, original.Width, original.Height);
    Context ctx = new Context(surface);
    CairoHelper.SetSourcePixbuf(ctx, original, 0, 0);

    // Draw on the surface here. Not shown since not relevant. 

    // Here, I want to convert the surface back to pixbuf.
    Pixbuf finishedPixbuf = ...;

    ctx.GetTarget().Dispose();
    ctx.Dispose();

    return finishedPixbuf;
}

我找不到如何将Surface转换回Pixbuf。

Answer 1

您正在寻找的函数似乎是Gdk的一部分：

cairo_surface_t *
gdk_cairo_surface_create_from_pixbuf (const GdkPixbuf *pixbuf,
                                      int scale,
                                      GdkWindow *for_window);

https://developer.gnome.org/gdk3/stable/gdk3-Cairo-Interaction.html#gdk-cairo-surface-create-from-pixbuf

具体地说，gdk_cairo_surface_create_from_pixbuf(pixbuf, 1, NULL)应该做你想做的事情。(对不起，我不知道如何在C#中表达。)