readpng_get_image 207 contrib/gregbook/readpng.c uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes) readpng_get_image 143 contrib/gregbook/readppm.c uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)