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Bitmap-->scaling-->PNG-->Buffer

Posted on 2004-04-08
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Last Modified: 2013-12-03
I need to:

1. Load a bitmap from a resource,
2. Scale it to a given x,y size,
3. Convert it to PNG and,
4. Dump the bits into a memory buffer (in PNG format).

Please suggest the best way to do that.
Preferably, no intermediate file I/O.

Language: C++
I can use: Raw GDI, ATL/WTL, GDI+

Point amount reflects urgency.

Thank you!
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Question by:alexo
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7 Comments
 
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Accepted Solution

by:
chensu earned 2000 total points
ID: 10785927
1. Use the LoadImage() API function.
2. Use the CopyImage() API function.
3. ?
4. ?
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LVL 23

Expert Comment

by:chensu
ID: 10786044
Using the

Status Image::Save(IStream *stream,
    const CLSID *clsidEncoder,
    const EncoderParameters *encoderParams
);

method and IStream (creating a memory stream), you can do #4.
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LVL 11

Author Comment

by:alexo
ID: 10786368
Sorry, forgot to mention something:
The desired size is in inches, not in pixels.

Thanks.
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LVL 11

Author Comment

by:alexo
ID: 10786376
Hmmm, nevermind...
GetDeviceCaps(LOGPIXELSX)
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LVL 11

Author Comment

by:alexo
ID: 11084230
Sorry, I was on vacation...
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