This one looks interesting (open source, win32 support): http://www.paintlib.de/paintlib/ (untested). It's not maitained anymore but source is included, and there are not many reason to face big issues today if it used to work well during many years.
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libpng 站点有完整的实现列表：
支持 PNG 的编程库和工具包
这个看起来很有趣（开源，win32 支持）：http://www.paintlib.de/paintlib/（未经测试）。它不再维护，但包含源代码，如果它多年来一直运行良好，那么今天没有太多理由面临大问题。
它不是基于 COM 的，但这对您来说是个问题吗？
The libpng site has a full list of implementation:
Programming Libraries and Toolkits with PNG Support
This one looks interesting (open source, win32 support): http://www.paintlib.de/paintlib/ (untested). It's not maitained anymore but source is included, and there are not many reason to face big issues today if it used to work well during many years.
It's not COM-based, but is it a problem for you?