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 file into buffer that already has the correct allocated size. Returns error code.*/

returns negative value on error. This should be pure C compatible, so no fstat. */

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

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

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

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

returns 1 if success, 0 if failure ==> nothing done*/

returns 1 if success, 0 if failure ==> nothing done*/

wpos = pos & (windowsize - 1)*/

write the lz77-encoded data, which has lit, len and dist codes, to compressed stream using huffman trees. tree_ll: the tree for lit and len codes. tre

in: Adam7 interlaced image, with no padding bits between scanlines, but between reduced images so that each reduced image starts at a byte. out: the

in: non-interlaced image with size w*h out: the same pixels, but re-ordered according to PNG's Adam7 interlacing, with no padding bits between scanli

the tree representation used by the decoder. return value is error*/

The following authored by Ben Hutchings <ben@decadent.org.uk> from https://womble.decadent.org.uk/readdir_r-advisory.html */

Boundary Package Merge step, numpresent is the amount of leaves, and c is the current chain.*/

sort the leaves with stable mergesort*/

read a PNG, the result will be in the same color type as the PNG (hence "generic")*/

Deflate for a block of type "dynamic", that is, with freely, optimally, created huffman trees*/

log2 approximation. A slight bit faster than std::log. */

palette must have 4 * palettesize bytes allocated, and given in format RGBARGBARGBARGBA... returns 0 if the palette is opaque, returns 1 if the palett

get the tree of a deflated block with dynamic tree, the tree itself is also Huffman compressed with a known tree*/

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

Returns how many bits needed to represent given value (max 8 bit)*/

inflate a block with dynamic of fixed Huffman tree*/

Automatically chooses color type that gives smallest amount of bits in the output image, e.g. grey if there are only greyscale pixels, palette if ther

profile must already have been inited with mode. It's ok to set some parameters of profile to done already.*/