Computes a minimal PNG color model that can contain all colors as indicated by the stats. The stats should be computed with lodepng_compute_color_stat

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*/

See ensureBits documentation above. This one ensures up to 17 bits */

Similar to getPixelColorsRGBA8, but with 3-channel RGB output.*/

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

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 error code.*/

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

integer binary logarithm, max return value is 31 */

integer approximation for i * log2(i), helper function for LFS_ENTROPY */

inflate a block with dynamic of fixed Huffman tree. btype must be 1 or 2.*/