/// <summary>
/// Read this GraphicsSurface color buffer.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/>
/// </param>
/// <param name="rBuffer">
/// A <see cref="ReadBufferMode"/> that specify the read buffer where the colors are read from.
/// </param>
/// <param name="x">
/// A <see cref="Int32"/> that specify the x coordinate of the lower left corder of the rectangle area to read.
/// </param>
/// <param name="y">
/// A <see cref="Int32"/> that specify the y coordinate of the lower left corder of the rectangle area to read.
/// </param>
/// <param name="width">
/// A <see cref="Int32"/> that specify the width of the rectangle area to read.
/// </param>
/// <param name="height">
/// A <see cref="Int32"/> that specify the height of the rectangle area to read.
/// </param>
/// <param name="pType">
/// A <see cref="PixelLayout"/> which determine the pixel storage of the returned image.
/// </param>
/// <returns>
/// It returns an <see cref="Image"/> representing the current read buffer <paramref name="rBuffer"/>.
/// </returns>
protected Image ReadBuffer(GraphicsContext ctx, ReadBufferMode rBuffer, uint x, uint y, uint width, uint height, PixelLayout pType)
{
Image image = null;
if ((x + width > Width) || (y + height > Height))
throw new ArgumentException("specified region lies outside the GraphicsSurface");
// Bind for reading
BindRead(ctx);
// Set for reading
Gl.ReadBuffer(rBuffer);
// Allocate image holding data read
image = new Image();
image.Create(pType, width, height);
// Set pixel transfer
foreach (int alignment in new int[] { 8, 4, 2, 1 }) {
if (image.Stride % alignment == 0) {
Gl.PixelStore(PixelStoreParameter.PackAlignment, alignment);
break;
}
}
// Grab frame buffer pixels
PixelFormat rFormat = Pixel.GetGlFormat(pType);
PixelType rType = Pixel.GetPixelType(pType);
Gl.ReadPixels((int)x, (int)y, (int)width, (int)height, rFormat, rType, image.ImageBuffer);
// Unbind from reading
UnbindRead(ctx);
return (image);
}
public void AddImage(Image image)
{
image.Create(image);
string imageID = image.GetImageID(image.Name);
HttpContext.Current.Response.Write(imageID + "," + Utility.Message);
}