/// <summary>
/// Saves this <see cref="FramebufferObject"/>'s image to a stream. You can't save multisampled framebuffers.
/// </summary>
/// <param name="framebuffer">The <see cref="FramebufferObject"/> whose image to save.</param>
/// <param name="stream">The stream to save the framebuffer image to.</param>
/// <param name="imageFormat">The format the image will be saved as.</param>
/// <param name="flip">Whether to flip the image after the pixels are read.</param>
public static void SaveAsImage(this FramebufferObject framebuffer, Stream stream, SaveImageFormat imageFormat, bool flip = false)
{
if (framebuffer == null)
{
throw new ArgumentNullException(nameof(framebuffer));
}
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
IImageFormat format = ImageUtils.GetFormatFor(imageFormat);
using Image <Rgba32> image = new Image <Rgba32>((int)framebuffer.Width, (int)framebuffer.Height);
framebuffer.ReadPixels(image, flip);
image.Save(stream, format);
}
/// <summary>
/// Reads pixels from this <see cref="FramebufferObject"/>.
/// </summary>
/// <param name="framebuffer">The <see cref="FramebufferObject"/> to read pixels from.</param>
/// <param name="x">The x position of the first pixel to read.</param>
/// <param name="y">The y position of the first pixel to read.</param>
/// <param name="image">The image in which to write the pixel data.</param>
/// <param name="flip">Whether to flip the image after the pixels are read.</param>
public static void ReadPixels(this FramebufferObject framebuffer, int x, int y, Image <Rgba32> image, bool flip = false)
{
if (framebuffer == null)
{
throw new ArgumentNullException(nameof(framebuffer));
}
if (image == null)
{
throw new ArgumentNullException(nameof(image));
}
if (!image.TryGetSinglePixelSpan(out Span <Rgba32> pixels))
{
throw new InvalidDataException(ImageUtils.ImageNotContiguousError);
}
framebuffer.ReadPixels(pixels, x, y, (uint)image.Width, (uint)image.Height);
if (flip)
{
image.Mutate(x => x.Flip(FlipMode.Vertical));
}
}
