=========================================================================== * Initialize the "longest match" routines for a new zlib stream */

This function was added to libpng-1.0.7 */

"tm" structure is not supported on WindowsCE */

Compare the CRC stored in the PNG file with that calculated by libpng from * the data it has read thus far. */

This function is called when there is a warning, but the library thinks * it can continue anyway. Replacement functions don't have to do anything *

Replace any alpha or transparency with the supplied background color. * "background" is already in the screen gamma, while "background_1" is * at a

Chop rows of bit depth 16 down to 8 */

Expands a palette row to an RGB or RGBA row depending * upon whether you supply trans and num_trans. */

Pack pixels into bytes. Pass the true bit depth in bit_depth. The * row_info bit depth should be 8 (one pixel per byte). The channels * should be

Add filler channel if we have RGB color */

Undoes intrapixel differencing */

Reduce RGB files to grayscale, with or without alpha * using the equation given in Poynton's ColorFAQ at * <http://www.inforamp.net/~poynton/> (THI

Shift pixel values to take advantage of whole range. Pass the * true number of bits in bit_depth. The row should be packed * according to row_info

Unpack pixels of 1, 2, or 4 bits per pixel into 1 byte per pixel, * without changing the actual values. Thus, if you had a row with * a bit depth o