=========================================================================== * Generate the codes for a given tree and bit counts (which need not be

get the distance code tree of a deflated block with fixed tree, as specified in the deflate specification*/

get the literal and length code tree of a deflated block with fixed tree, as per the deflate specification*/

Get RGBA8 color of pixel with index i (y * width + x) from the raw image with given color type.*/

Similar to getPixelColorRGBA8, but with all the for loops inside of the color mode test cases, optimized to convert the colors much faster, when conve

Load up input buffer and set eof flag if last data loaded -- return -1 on error, 0 otherwise. Note that the eof flag is set when the end of the in

Decompress from input to the provided next_out and avail_out in the state. On return, state->x.have and state->x.next point to the just decompresse

Look for gzip header, set up for inflate or copy. state->x.have must be 0. If this is the first time in, allocate required memory. state->how wil

Reset gzip file state */

-- see zlib.h -- */

-- see zlib.h -- */

Decode literal, length, and distance codes and write out the resulting literal and match bytes until either not enough input or output is availa

=========================================================================== * Initialize a new block. */

write given buffer to the file, overwriting the file, it doesn't append to it.*/

For 80x86 and 680x0, an optimized version will be provided in match.asm or * match.S. The code will be functionally equivalent. */

MAKECRCH */ Generate tables for a byte-wise 32-bit CRC calculation on the polynomial: x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+

* Row reader. **/

* Prints a printf-formatted debug message (level = OPNG_MSG_DEBUG) * to the logger. */

* Retrieve the alpha samples from the given image row. */

* Retrieves the input file name. */

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

* Loads an image object from libpng structures. */

* Prints an out-of-memory critical message to the logger * and terminates the program with EX_UNAVAILABLE. */

* Prints a partial line of information regarding the encoding parameters. */

* Prints, in a descriptive form, the difference between two sizes. */

* Prints the IDAT size line. */

* Prints a line of information regarding the image representation. */

* Change the size of the palette buffer. * Changing info_ptr->num_palette directly, avoiding reallocation, should * have been sufficient, but can't

* Reduce the bit depth of a palette image to the lowest possible value. * The parameter reductions should contain OPNG_REDUCE_8_TO_4_2_1. * The func

* Extension to libpng's unknown chunk handler. */

* Sets the user options in an optimizer object. */

* Clears a signature set. */

* Converts a string representing an object to an object id. */

* Returns 1 if the given chunk ought to be stripped, or 0 otherwise. */

* Resets (i.e. sets to zero) the chroma channel. * Returns 1 if this operation is applied, or 0 otherwise. */

* Sets the precision of the alpha channel to a given value; * if this value is 0, resets (i.e. sets to MAX) the alpha channel. * Returns 1 if this o

* Check if the image information is valid. * The image information is said to be valid if all the required * critical chunk data is present in the p

* Prints a vprintf-formatted message to the logger. */

* Writes an image to a PNG file stream. * Performs the encoding without any I/O, if the given stream is NULL. */

* Sets the file position indicator at the specified file offset. */

* Sets the translation mode of the specified file stream to the * specified mode. */

* Returns the current value of the file position indicator. */

* Extracts the base component of a path name. */

* Converts a rangeset string to a bitset. */

* Creates a path name by changing the directory component of a given * path name. */

Paeth predicter, used by PNG filter type 4 The parameters are of type short, but should come from unsigned chars, the shorts are only needed to make t

Function to format a fixed point value in ASCII. */

Function to format a floating point value in ASCII with a given * precision. */

Utility function for png_handle_unknown; set up png_ptr::unknown_chunk */

always set if COLORSPACE */

Added in libpng-1.6.0, a different check for the validity of a set of cHRM * chunk chromaticities. Earlier checks used to simply look for the overfl

* Decompress trailing data in a chunk. The assumption is that read_buffer * points at an allocated area holding the contents of a chunk with a * tr

Initialize the compressor for the appropriate type of compression. */

Used from png_read_destroy and below to release the memory used by the gamma * tables. */

Free a png_struct */

Swaps red and blue bytes within a pixel */

Added at libpng-1.5.10 */