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14 1. The origin of this software must not be misrepresented; you must not
15 claim that you wrote the original software. If you use this software
41 In addition to those below, you can also define LODEPNG_NO_COMPILE_CRC to
44 /*deflate & zlib. If disabled, you must specify alternative zlib functions in
80 /*Compile the default allocators (C's free, malloc and realloc). If you disable this,
81 you can define the functions lodepng_free, lodepng_malloc and lodepng_realloc in your
87 /*compile the C++ version (you can disable the C++ wrapper here even when compiling for C++)*/
355 When decoding, by default you can ignore this palette, since LodePNG already
369 When decoding, by default you can ignore this information, since LodePNG sets
448 So when decoding, you may get these in a different color mode than the one you requested
451 When encoding with auto_convert, you must use the color model defined in info_png.color for
519 …profile values. It merely passes on the information. If you wish to use color profiles and convert…
556 …profile as closely as possible, if you wish to do this you should provide the correct values for g…
560 …PNG color types and a "GRAY" profile for gray PNG color types. If you disable auto_convert, you mu…
567 make sure you compute it carefully to avoid the above problems.
593 …this if you wish to store an ancillary chunk that is not supported by LodePNG (such as sPLT or hIS…
612 void lodepng_clear_text(LodePNGInfo* info); /*use this to clear the texts again after you filled th…
616 void lodepng_clear_itext(LodePNGInfo* info); /*use this to clear the itexts again after you filled …
620 void lodepng_clear_icc(LodePNGInfo* info); /*use this to clear the texts again after you filled the…
655 unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/
698 /*use predefined_filters buffer: you specify the filter type for each scanline*/
745 the same length as the amount of scanlines in the image, and each value must <= 5. You
774 …LodePNGColorMode info_raw; /*specifies the format in which you would like to get the raw pixel buf…
976 after usage you should free it.
1150 If you want to start using LodePNG right away without reading this doc, get the
1218 The C version uses buffers allocated with alloc that you need to free()
1219 yourself. You need to use init and cleanup functions for each struct whenever
1229 To use the C++ version, you need to rename the source file to lodepng.cpp
1232 To use the C version, you need to rename the source file to lodepng.c (instead
1240 exploits. If you discover one, please let me know, and it will be fixed.
1266 *) LodePNGColorMode info_raw: here you can say what color mode of the raw image (the output) you wa…
1267 *) LodePNGDecoderSettings decoder: you can specify a few extra settings for the decoder to use
1283 When decoding, here you can specify which color type you want
1286 always works, except if you want it to convert a color PNG to grayscale or to
1299 and you'll have to puzzle the colors of the pixels together yourself using the
1320 *) LodePNGInfo info_png: here you specify how you want the PNG (the output) to be.
1321 *) LodePNGColorMode info_raw: here you say what color type of the raw image (the input) has
1322 *) LodePNGEncoderSettings encoder: you can specify a few settings for the encoder to use
1327 When encoding, you use this the opposite way as when decoding: for encoding,
1328 you fill in the values you want the PNG to have before encoding. By default it's
1332 The encoder will not always exactly match the LodePNGInfo struct you give,
1345 You specify the color type of the raw image that you give to the input here,
1346 including a possible transparent color key and palette you happen to be using in
1366 *) force_palette: if colortype is 2 or 6, you can make the encoder write a PLTE
1381 you decode a PNG, you get the result as a raw image in the color type you want,
1383 And if you encode an image, by default LodePNG will automatically choose the PNG
1385 of colors in the image. It can be configured to let you control it instead as
1394 is easy, but there are multiple ways if you want to give some channels more
1397 By default, when decoding, you get the raw image in 32-bit RGBA or 24-bit RGB
1400 the input image to be 32-bit RGBA or 24-bit RGB. So, unless you want to control
1401 the color format of the images yourself, you can skip this chapter.
1409 a certain amount of bits per pixel. If you want the output raw image after
1426 As explained in the sections about the encoder and decoder, you can specify
1430 If, when decoding, you want the raw image to be something else than the default,
1431 you need to set the color type and bit depth you want in the LodePNGColorMode,
1434 If, when encoding, you use another color type than the default in the raw input
1435 image, you need to specify its color type and bit depth in the LodePNGColorMode
1439 If, when encoding, you don't want LodePNG to choose the output PNG color type
1440 but control it yourself, you need to set auto_convert in the encoder settings
1441 to false, and specify the color type you want in the LodePNGInfo of the
1457 PNG image, but it can be ignored since the raw image has the color type you requested instead
1486 If you want no color conversion to be done (e.g. for speed or control):
1487 -In the encoder, you can make it save a PNG with any color type by giving the
1490 -In the decoder, you can make it store the pixel data in the same color type
1500 The raw input image you give to the encoder, and the raw output image you get from the decoder
1516 colors, the order in which you store R, G, B and A, and so on. Supporting and
1519 This may mean that, depending on your use case, you may want to convert the big
1522 anyway, but it means you cannot simply cast the unsigned char* buffer to an
1547 If you want to add extra chunks to a PNG you encode, or use LodePNG for a PNG
1562 If you have a buffer containing the PNG image data, then the first chunk (the
1564 signature of the PNG and are not part of a chunk. But if you start at byte 8
1565 then you have a chunk, and can check the following things of it.
1604 Iterate to the next chunk. This works if you have a buffer with consecutive chunks. Note that these
1635 When using the decoder to decode a PNG, you can make it store all unknown chunks
1636 if you set the option settings.remember_unknown_chunks to 1. By default, this
1640 If you need it to add a particular chunk that isn't known by LodePNG, you can
1692 This is not standard C++ and will not be added to the stock LodePNG. You can
1706 If you encounter problems on any compilers, feel free to let me know and I may
1792 state.info_raw.colortype: color type of raw input image you provide
1793 state.info_raw.bitdepth: bit depth of raw input image you provide
1826 change is backwards compatible unless you relied on unknown_chunks for those.
1972 LodePNG. If you encounter a PNG image that doesn't work properly with this