If the bit depth < 8, it is expanded to 8. Also, if the already * expanded transparency value is supplied, an alpha channel is built. */

Expand grayscale files to RGB, with or without alpha */

Invert monochrome grayscale data */

Swaps pixel packing order within bytes */

Transform the row. The order of transformations is significant, * and is very touchy. If you add a transformation, take care to * decide how it fi

Swaps byte order on 16 bit depth images */

Is the given gamma significantly different from sRGB? The test is the same * one used in pngrtran.c when deciding whether to do gamma correction. T

This function returns a pointer to the error_ptr associated with the user * functions. The application should free any memory associated with this

Easy access to info, added in libpng-0.99 */

Utility to find the base format of a PNG file from a png_struct. */

png_inflate now returns zlib error codes including Z_OK and Z_STREAM_END to * allow the caller to do multiple calls if required. If the 'finish' fla

This is really here only to work round a spurious warning in GCC 4.6 and 4.7 * that arises because of the checks in png_realloc_array that are repeat

Utility used below - a simple accurate power of ten from an integral * exponent. */

A local convenience routine. */

Read the entire image. If the image has an alpha channel or a tRNS * chunk, and you have called png_handle_alpha()[*], you will need to * initializ

GRR 970116 */ Convenience reset API. */

This function is called when the application wants to use another method * of handling errors and warnings. Note that the error function MUST NOT *

Expand to 16-bit channels, expand the tRNS chunk too (because otherwise * it may not work correctly.) */

Turn on packed pixel swapping */

Chop 16-bit depth files to 8-bit depth */

These functions support 'formatted' warning messages with up to * PNG_WARNING_PARAMETER_COUNT parameters. In the format string the parameter * is i

Write an iTXt chunk */

Write the image. You only need to call this function once, even * if you are writing an interlaced image. */

Writes all the PNG information. This is the suggested way to use the * library. If you have a new chunk to add, make a function to write it, * and

Simple function to write the signature. If we have already written * the magic bytes of the signature, or more likely, the PNG stream is * being em

Write the tIME chunk. Use either png_convert_from_struct_tm() * or png_convert_from_time_t(), or fill in the structure yourself. */

Write a compressed text chunk */

Added at libpng-1.5.5 to support read and write of true CIEXYZ values for * cHRM, as opposed to using chromaticities. These internal APIs return *

* Validates a PNM structure. * Returns 1 on success, 0 on failure. **/

=========================================================================== * Restore the heap property by moving down the tree starting at node k,

out must be buffer big enough to contain uncompressed IDAT chunk data, and in must contain the full image. return value is error**/

=========================================================================== * Scan a literal or distance tree to determine the frequencies of the cod

search the index in the array, that has the largest value smaller than or equal to the given value, given array must be sorted (if no value is smaller

=========================================================================== * Send a literal or distance tree in compressed form, using the codes in