LEADTOOLS provides a "zoomed view" feature that can be attached to a window handle. The Zoom View gives you the ability to "zoom in" on the image loaded into the window to which it is attached. This is similar to having multiple magnifying glasses on the same source image.
Overview of LEADTOOLS Zoom View
Native 32 and 64 bit LEADTOOLS Zoom View binaries
Add LEADTOOLS Zoom View to single and multi-thread applications.
The rectangle describing the source area of the image to be zoomed
The rectangle describing the location of the zoomed view
The zoom factor
Whether the zoomed view should be the size of the rectangle describing the location of the zoomed view, or whether to display the source rectangle magnified by the specified zoom factor
The border style for the zoomed view, along with border color and pen style
The border style for the source rectangle, along with border color and pen style
Whether callout lines will be used, along with color and pen style
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