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This project is fork by there

• 1 add a way to ouput data, so you can decode image data into preallocated buffers.

• If you need to deocde a png image and store the raw data into a preallocated buffer, you need use upng_decode_to_buffer() fun. Like that upng_decode_to_buffer(upng, (unsigned char *)decoder_buffer, sizeof(decoder_buffer));.

• The size of preallocated buffer is must have a minimum size of that png file size plus width*height*3.