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CxImagePNG problem.How to blit part of the picture?

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I want to blit part of the whole source picture when using CxImagePNG ,but all of the interfaces just allow me to blit picture from the left_top point. How to start blitting from the point that should be?

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I can not wait for reply.
So after nearly two hours' working ,I work it out by myself.The source code is a little confusing ,the variable count is so many,I have to recognize them one by one.
Finaly , the function I added works.

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