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DrawDib and JPEG

Posted on 1997-03-25
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Hi.

I'm using Visual C++ 4.2 and I have a simple(?) question for you:

How can I use the DrawDib routines in Visual C++ to load and display JPEG files?
The help topic on "About the DrawDib functions" says:
"The DrawDib functions support several compression and decompression methods, including run-length encoding, JPEG, Cinepak, 411 YUV, and Indeo™."

I have inspected mmreg.h and found JPEGINFOHEADER and lots of JPEG-stuff. But how do I use it???

Please help!
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Question by:Greven
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by:Greven
ID: 1300642
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mbhakta earned 150 total points
ID: 1300643
JPEG compression though follows most of the encoding/compression techniques you have discussed doesnot mean that DrawDIB will show a JPEG image so easily. You will need to extract the JPEG header and convert it into a DIB to display it on the screen. Looks like a big task. Not really... Mainly because JPEG has been documented pretty well on the net and there are discussion groups available who discuss about JPEG day and night.

There are several ways to procure a JPEG displayer :
- Contact the Independent JPEG group or visit their site. They have ready made cross-platform source code available for your use. Compile it and you are ready. But most of these code/s are to do with conversion from JPEG to BMP etc. So doing the UI and displaying it on the screen is your job.

- The other procurement source is buying a 3rd party imaging package like Accusoft, Imageman, LeadTools etc. They roughly cost between $500 - $1500 and take care of all the head-aches for you.

I would take the first approach and do it myself. Mainly because reading thru the code is absolutely beautiful.
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