Memory Device Contexts - Win32 Programmer's Reference

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Memory Device Contexts

Windows supports a memory device context that stores bitmapped images for a particular device. An application creates a memory device context by calling the CreateCompatibleDC function and supplying a handle that identifies a device context for a particular device. When Windows processes this call, it creates a bitmap having a color format compatible with the original device. Because the bitmap is compatible with the given device, a memory device context is also sometimes referred to as a compatible device context.

The original bitmap in a memory device context is simply a placeholder. Its dimensions are one pixel by one pixel. Before an application can begin drawing, it must select a bitmap with the appropriate width and height into the device context by calling the SelectObject function. Once the new bitmap is selected into the memory device context, an application can begin using the device context to store images. For more information about bitmaps and bitmap operations, see Bitmaps.

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