========================================================================= */

Get RGBA16 color of pixel with index i (y * width + x) from the raw image with given color type, but the given color type must be 16-bit itself.*/

========================================================================= */

Fetch data and put it in the output buffer. Assumes state->x.have is 0. Data is either copied from the input file or decompressed from the input

Use read() to load a buffer -- return -1 on error, otherwise 0. Read from state->fd, and update state->eof, state->err, and state->msg as appropri

Skip len uncompressed bytes of output. Return -1 on error, 0 on success. */

returns the code, or (unsigned)(-1) if error happened inbitlength is the length of the complete buffer, in bits (so its byte length times 8) */

Return the CRC of the bytes buf[0..len-1].*/

buffer must have at least 4 allocated bytes available*/

* Stops the decoder. */

* Flushes the logger at the given severity level. */

* Initializes a codec context object. */

* Initializes an image object. */

* Initializes a stats object. */

* Queries whether the input file is overwritten. */

* Tests whether the given chunk is an image chunk. */

* Parses an input string in the form "object[,object...]" and adds * the results to the given id set and (if given) chunk signature set. */

* Returns 1 if a chunk signature is found in the given set, * or 0 otherwise. */

* Initializes a signature set. */

* Sorts and uniq's the array buffer that stores chunk signatures. */

This is the code to hack the first two bytes of the deflate stream (the * deflate header) to correct the windowBits value to match the actual data

* Changes the name of a file path. */

* Removes a directory entry. */

Internal function to build a single 16-bit table - the table consists of * 'num' 256 entry subtables, where 'num' is determined by 'shift' - the amou

Build a single 8-bit table: same as the 16-bit case but much simpler (and * typically much faster). Note that libpng currently does no sBIT processi

The same but for a complete string. */

This is similar to png_text_compress, above, except that it does not require * all of the data at once and, instead of buffering the compressed resul

Convert the supplied time into an RFC 1123 string suitable for use in * a "Creation Time" or other text-based time string. */

The following API is not called internally */

Remove a channel - this used to be 'png_do_strip_filler' but it used a * somewhat weird combination of flags to determine what to do. All the calls

Clean up (or trim) a linked list of compression buffers. */

Read and check the IDHR chunk */

Read and check the palette */

Note: this does not correctly handle chunks that are > 64K under DOS */

Read the pCAL chunk (described in the PNG Extensions document) */

Read the sCAL chunk */

Note: this does not properly handle chunks that are > 64K under DOS */

Note: this does not correctly handle chunks that are > 64K under DOS */

Do all the *safe* initialization - 'safe' means that png_error won't be * called, so setting up the jmp_buf is not required. This means that anythin

This is used below to find the size of an image to pass to png_deflate_claim, * so it only needs to be accurate if the size is less than 16384 bytes

png_inflate_claim: claim the zstream for some nefarious purpose that involves * decompression. Returns Z_OK on success, else a zlib error code. It

Perform a partial read and decompress, producing 'avail_out' bytes and * reading from the current chunk as required. */

Initialize the default input/output functions for the PNG file. If you * use your own read or write routines, you can call either png_set_read_fn()

Read the chunk header (length + type name). * Put the type name into png_ptr->chunk_name, and return the length. */

If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a * smaller value of window_bits if it can do so safely. */

Expand paletted images to RGB, expand grayscale images of * less than 8-bit depth to 8-bit depth, and expand tRNS chunks * to alpha channels. */

Allow the application to select one or more row filters to use. */