LispWorks CAPI User Guide > 12 Graphics Ports > 12.8 Working with images

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12.8.2 External images

An External Image is an intermediate object. It is a representation of a graphic but is not associated with a port and cannot be used directly for drawing.

An object of type external-image is created by reading an image from a file, or by externalizing an image object, or by copying an existing external-image . Or, if you have the image bitmap data, you can create one directly as in the examples/capi/buttons/button.lisp example.

The external-image contains the bitmap data, potentially compressed. You can copy external-image objects, or write them to file, or compress the data.

You cannot query the size of the image in an external-image object directly. To get the dimensions without actually drawing it on screen see Pixmap graphics ports.

12.8.2.1 Transparency

12.8.2.2 Converting an external image


LispWorks CAPI User Guide (Unix version) - 22 Dec 2009

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