private void WithExtraCanvas(Rectangle rect, Action <X11Canvas> action)
{
using (X11Image tempImage = X11Image.Create(display, visual, drawableId, rect.Width, rect.Height))
{
var gcValues = new XGCValues();
gcValues.foreground = ToPArgb(Color.Transparent);
var gcValueMask = XGCValueMask.GCForeground;
var gc = LibX11.XCreateGC(display, drawableId, gcValueMask, ref gcValues);
try
{
// todo: check int -> uint conversion
LibX11.XFillRectangle(display, tempImage.PixmapId, gc, 0, 0, (uint)rect.Width, (uint)rect.Height);
}
finally
{
LibX11.XFreeGC(display, gc);
}
using (var innerCanvas = X11Canvas.CreateForDrawable(display, screenNum, objectCache, visual, colormap, pictFormatPtr, tempImage.PixmapId))
{
action(innerCanvas);
DrawImage(tempImage, rect.X + origin.X, rect.Y + origin.Y);
}
}
}
public INativeImage CreateImage(int width, int height)
{
// todo: what is the best place for this validation
if (width < 0 || height < 0)
{
throw new ArgumentException($"Image dimensions cannot be negative ({width} x {height}).");
}
if (width * 4L > int.MaxValue || height * 4L > int.MaxValue || 4L * width * height > int.MaxValue)
{
throw new ArgumentException($"Image dimensions are too large ({width} x {height}).");
}
return(X11Image.Create(display, visual, rootWindow, width, height));
}
public INativeImage LoadImageFromStream(Stream stream)
{
using (GdkPixBufBitmapSource source = LoadSourceFromStream(stream))
{
X11Image disposableImage = X11Image.Create(display, visual, rootWindow, source.Width, source.Height);
try
{
source.CopyToImage(disposableImage);
X11Image image = disposableImage;
disposableImage = null;
return(image);
}
finally
{
disposableImage?.Dispose();
}
}
}
internal X11Image CreateImage(int width, int height)
{
return(X11Image.Create(display, visual, rootWindow, width, height));
}