27 The manual and changelog are in the header file "lodepng.h"
42 #if defined(_MSC_VER) && (_MSC_VER >= 1310) /*Visual Studio: A few warning types are not desired he…
208 -The string tools are made to avoid problems with compilers that declare things like strncat as dep…
440 /* This one is to use for adding huffman symbol, the value bits are written MSB first */
478 safely even if not enough bits are available.
479 Returns 1 if there are enough bits available, 0 if not.
646 /*the order in which "code length alphabet code lengths" are stored as specified by deflate, out of…
703 …/*get the FIRSTBITS MSBs, the MSBs of the symbol are encoded first. See later comment about the re…  in HuffmanTree_makeTable()
739 …/*reverse bits, because the huffman bits are given in MSB first order but the bit reader reads LSB…  in HuffmanTree_makeTable()
757       /*the FIRSTBITS MSBs of the symbol are the first table index*/  in HuffmanTree_makeTable()
779     codes are never used). In both cases, not all symbols of the table will be  in HuffmanTree_makeTable()
792     /* A good huffman tree has N * 2 - 1 nodes, of which N - 1 are internal nodes.  in HuffmanTree_makeTable()
895     /*mark only those that are in use*/  in bpmnode_create()
902     /*collect those that are free*/  in bpmnode_create()
957     /*in the end we are only interested in the chain of the last list, so no  in boundaryPM()
991   make these work as well ensure there are at least two symbols. The  in lodepng_huffman_code_lengths()
1084   /*there are 32 distance codes, but 30-31 are unused*/  in generateFixedDistanceTree()
1302           ERROR_BREAK(18); /*error: invalid distance code (30-31 are never used)*/  in inflateHuffmanBlock()
1376   /*read the literal data: LEN bytes are now stored in the out buffer*/  in inflateNoCompression()
1466   /*values in encoded vector are those used by deflate:  in addLengthDistance()
1584 LZ77-encode the data. Return value is error code. The input are raw bytes, the output
1715     if(length < 3) /*only lengths of 3 or higher are supported as length/distance pair*/ {  in encodeLZ77()
1815   another huffman tree is used for the dist values ("d"). These two trees are  in deflateDynamic()
1817   are also run-length encoded and huffman compressed. This gives a huffman tree  in deflateDynamic()
1818   of code lengths "cl". The code lengths used to describe this third tree are  in deflateDynamic()
1836 …RDER, then due to the huffman compression of huffman tree representations ("two levels"), there are  in deflateDynamic()
2434 /* The color channel bits of less-than-8-bit pixels are read with the MSB of bytes first,
3555       /*if the input was also palette with same bitdepth, then the color types are also  in lodepng_convert()
3557       even in case there are duplicate colors in the palette.*/  in lodepng_convert()
3721   and mark things as done already if we know they are the most expensive case already*/  in lodepng_compute_color_stats()
3974 The parameters are of type short, but should come from unsigned chars, the shorts
3975 are only needed to make the paeth calculation correct.
4051 …/*when decoding a new PNG image, make sure all parameters created after previous decoding are rese…  in lodepng_inspect()
4058 …CERROR_RETURN_ERROR(state->error, 28); /*error: the first 8 bytes are not the correct PNG signatur…  in lodepng_inspect()
4079   /*errors returned only after the parsing so other values are still output*/  in lodepng_inspect()
4108   unfilter a PNG image scanline by scanline. when the pixels are smaller than 1 byte,  in unfilterScanline()
4206   w and h are image dimensions or dimensions of reduced image, bpp is bits per pixel  in unfilter()
4207 …in and out are allowed to be the same memory address (but aren't the same size since in has the ex…  in unfilter()
4240 NOTE: comments about padding bits are only relevant if bpp < 8
4285 …After filtering there are still padding bits if scanlines have non multiple of 8 bit amounts. They…  in removePaddingBits()
4288   in and out are allowed to be the same buffer, in may also be higher but still overlapping; in must  in removePaddingBits()
4375     /*error: more alpha values given than there are palette entries*/  in readChunk_tRNS()
4416     /*the values are truncated to bitdepth in the PNG file*/  in readChunk_bKGD()
4423     /*the values are truncated to bitdepth in the PNG file*/  in readChunk_bKGD()
5451   out must be a buffer with as size: h + (w * h * bpp + 7u) / 8u, because there are  in filter()
5516 …            /*For differences, each byte should be treated as signed, values above 127 are negative  in filter()
5666 there are no padding bits, not between scanlines, not between reduced images
5669 NOTE: comments about padding bits are only relevant if bpp < 8
5798   It is a gray profile if bytes 16-19 are "GRAY", rgb profile if bytes 16-19  in isGrayICCProfile()
5799   are "RGB ". We do not perform any full parsing of the ICC profile here, other  in isGrayICCProfile()
6151     /*this error could happen if there are only 0 or 1 symbols present in the huffman code:*/  in lodepng_error_text()
6204 …case 61: return "invalid BTYPE given in the settings of the encoder (only 0, 1 and 2 are allowed)";  in lodepng_error_text()