Copies one area of a graphics port to another area of a different graphics port.
The deprecated function pixblt copies one area of from-port to another area of to-port using the specified operation and mask . Both ports should be the same depth. The graphics port transforms are not used.
operation is ignored when the drawing-mode is :quality (the default). See Combining pixels with :compatible drawing for valid values for operation .
pixblt is deprecated, because the :quality drawing-mode does not support operation , and because it ignores the transformations, which means it does not always work as expected. In particular, it can draw at the wrong place inside the display-callback of output-pane.
Use instead copy-area, which does take account of the transform. See also graphics-state parameter compositing-mode for a way to control how copy-area blends the source and the target.