You can access the entire group of DrawDib functions by using the DrawDibOpen
function. This function loads the dynamic-link library (DLL), allocates
memory resources, creates a DrawDib device context (DC), and maintains a reference
count of the number of DCs that are initialized. DrawDibOpen
also returns a handle of the new DC that you use with the other DrawDib
You can release a DrawDib DC when you finish using it by using the DrawDibClose
also decrements the reference count of the applications accessing the DLL.
The call to DrawDibClose
should be the last DrawDib function in your application.
You can create as many DrawDib DCs as you want. You can use multiple DrawDib
DCs to draw several bitmaps simultaneously. You can also create multiple DrawDib
DCs, each with unique characteristics, so your application can choose and then
use the DC with the most appropriate settings. For example, you can create two
DrawDib DCs in an application: one that displays an image at its normal
resolution, and the other that displays an enlarged portion of the image.
To run efficiently, DrawDib functions require information about the display
adapter and its driver. The display profile is obtained by running a series of
tests on the display adapter the first time the DLL containing the DrawDib
functions is accessed. The DrawDib functions use this information for all
applications. You can repeat these tests when necessary by using the DrawDibProfileDisplay
Retrieving and storing the display profile is typically a one-time
occurrence. If, however, the profile information is deleted or another display driver is
installed in the system, DrawDib reruns the tests.
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