LSB Graphics Extensions Specification
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png_set_read_user_transform_fn

Name

png_set_read_user_transform_fn -- install a custom input transformation callback function

#include <png.h>

void png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr read_user_transform_fn);

This interface shall install a custom input transformation callback function.

The parameter png_ptr shall specify the PNG file to be transformed.

The parameter read_user_transform_fn shall specify the custom callback function.

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png_set_read_user_chunk_fn	Up	png_set_rgb_to_gray