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*/

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.*/

Adds a single color to the color stats. The stats must already have been inited. The color must be given as 16-bit (with 2 bytes repeating for 8-bit a

Safely check if a + b > c, even if overflow could happen. */

read the information from the header and store it in the LodePNGInfo. return value is error*/

Safely checks whether size_t overflow can be caused due to amount of pixels. This check is overcautious rather than precise. If this check indicates n

out must be buffer big enough to contain full image, and in must contain the full decompressed data from the IDAT chunks (with filter index bytes and

put a pixel, given its RGBA16 color, into image of any color 16-bitdepth type*/

put a pixel, given its RGBA color, into image of any color type*/

Public for testing only. steps and result must have numsteps values. */