Renamed libs

Cleaner and more flexible.

1 files changed, 1036 insertions, 0 deletions

diff --git a/libs/libgui/png.h b/libs/libgui/png.h
new file mode 100644
index 0000000..dba0947
--- /dev/null
+++ b/libs/libgui/png.h
@@ -0,0 +1,1036 @@
+/*
+LodePNG version 20201017
+
+Copyright (c) 2005-2020 Lode Vandevenne
+Copyright (c) 2021 Marvin Borner
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+*/
+
+#ifndef PNG_H
+#define PNG_H
+
+/* For now! TODO: Use PNG encoding */
+#define PNG_NO_COMPILE_ENCODER
+
+#include <def.h>
+extern const char *PNG_VERSION_STRING;
+
+/*
+The following #defines are used to create code sections. They can be disabled
+to disable code sections, which can give faster compile time and smaller binary.
+The "NO_COMPILE" defines are designed to be used to pass as defines to the
+compiler command to disable them without modifying this header, e.g.
+-DPNG_NO_COMPILE_ZLIB for gcc.
+In addition to those below, you can also define PNG_NO_COMPILE_CRC to
+allow implementing a custom png_crc32.
+*/
+/*deflate & zlib. If disabled, you must specify alternative zlib functions in
+the custom_zlib field of the compress and decompress settings*/
+#ifndef PNG_NO_COMPILE_ZLIB
+#define PNG_COMPILE_ZLIB
+#endif
+
+/*png encoder and png decoder*/
+#ifndef PNG_NO_COMPILE_PNG
+#define PNG_COMPILE_PNG
+#endif
+
+/*deflate&zlib decoder and png decoder*/
+#ifndef PNG_NO_COMPILE_DECODER
+#define PNG_COMPILE_DECODER
+#endif
+
+/*deflate&zlib encoder and png encoder*/
+#ifndef PNG_NO_COMPILE_ENCODER
+#define PNG_COMPILE_ENCODER
+#endif
+
+/*the optional built in harddisk file loading and saving functions*/
+#ifndef PNG_NO_COMPILE_DISK
+#define PNG_COMPILE_DISK
+#endif
+
+/*support for chunks other than IHDR, IDAT, PLTE, tRNS, IEND: ancillary and unknown chunks*/
+#ifndef PNG_NO_COMPILE_ANCILLARY_CHUNKS
+#define PNG_COMPILE_ANCILLARY_CHUNKS
+#endif
+
+/*ability to convert error numerical codes to English text string*/
+#ifndef PNG_NO_COMPILE_ERROR_TEXT
+#define PNG_COMPILE_ERROR_TEXT
+#endif
+
+/*Compile the default allocators (C's free, malloc and realloc). If you disable this,
+you can define the functions png_free, png_malloc and png_realloc in your
+source files with custom allocators.*/
+#ifndef PNG_NO_COMPILE_ALLOCATORS
+#define PNG_COMPILE_ALLOCATORS
+#endif
+
+/*compile the C++ version (you can disable the C++ wrapper here even when compiling for C++)*/
+#ifdef __cplusplus
+#ifndef PNG_NO_COMPILE_CPP
+#define PNG_COMPILE_CPP
+#endif
+#endif
+
+#ifdef PNG_COMPILE_CPP
+#include <string>
+#include <vector>
+#endif /*PNG_COMPILE_CPP*/
+
+#ifdef PNG_COMPILE_PNG
+/*The PNG color types (also used for raw image).*/
+typedef enum pngColorType {
+	LCT_GREY = 0, /*grayscale: 1,2,4,8,16 bit*/
+	LCT_RGB = 2, /*RGB: 8,16 bit*/
+	LCT_PALETTE = 3, /*palette: 1,2,4,8 bit*/
+	LCT_GREY_ALPHA = 4, /*grayscale with alpha: 8,16 bit*/
+	LCT_RGBA = 6, /*RGB with alpha: 8,16 bit*/
+	/*LCT_MAX_OCTET_VALUE lets the compiler allow this enum to represent any invalid
+  byte value from 0 to 255 that could be present in an invalid PNG file header. Do
+  not use, compare with or set the name LCT_MAX_OCTET_VALUE, instead either use
+  the valid color type names above, or numeric values like 1 or 7 when checking for
+  particular disallowed color type byte values, or cast to integer to print it.*/
+	LCT_MAX_OCTET_VALUE = 255
+} pngColorType;
+
+#ifdef PNG_COMPILE_DECODER
+/*
+Converts PNG data in memory to raw pixel data.
+out: Output parameter. Pointer to buffer that will contain the raw pixel data.
+     After decoding, its size is w * h * (bytes per pixel) bytes larger than
+     initially. Bytes per pixel depends on colortype and bitdepth.
+     Must be freed after usage with free(*out).
+     Note: for 16-bit per channel colors, uses big endian format like PNG does.
+w: Output parameter. Pointer to width of pixel data.
+h: Output parameter. Pointer to height of pixel data.
+in: Memory buffer with the PNG file.
+insize: size of the in buffer.
+colortype: the desired color type for the raw output image. See explanation on PNG color types.
+bitdepth: the desired bit depth for the raw output image. See explanation on PNG color types.
+Return value: png error code (0 means no error).
+*/
+u32 png_decode_memory(u8 **out, u32 *w, u32 *h, const u8 *in, u32 insize, pngColorType colortype,
+		      u32 bitdepth);
+
+/*Same as png_decode_memory, but always decodes to 32-bit RGBA raw image*/
+u32 png_decode32(u8 **out, u32 *w, u32 *h, const u8 *in, u32 insize);
+
+/*Same as png_decode_memory, but always decodes to 24-bit RGB raw image*/
+u32 png_decode24(u8 **out, u32 *w, u32 *h, const u8 *in, u32 insize);
+
+#ifdef PNG_COMPILE_DISK
+/*
+Load PNG from disk, from file with given name.
+Same as the other decode functions, but instead takes a filename as input.
+*/
+u32 png_decode_file(u8 **out, u32 *w, u32 *h, const char *filename, pngColorType colortype,
+		    u32 bitdepth);
+
+/*Same as png_decode_file, but always decodes to 32-bit RGBA raw image.*/
+u32 png_decode32_file(u8 **out, u32 *w, u32 *h, const char *filename);
+
+/*Same as png_decode_file, but always decodes to 24-bit RGB raw image.*/
+u32 png_decode24_file(u8 **out, u32 *w, u32 *h, const char *filename);
+#endif /*PNG_COMPILE_DISK*/
+#endif /*PNG_COMPILE_DECODER*/
+
+#ifdef PNG_COMPILE_ENCODER
+/*
+Converts raw pixel data into a PNG image in memory. The colortype and bitdepth
+  of the output PNG image cannot be chosen, they are automatically determined
+  by the colortype, bitdepth and content of the input pixel data.
+  Note: for 16-bit per channel colors, needs big endian format like PNG does.
+out: Output parameter. Pointer to buffer that will contain the PNG image data.
+     Must be freed after usage with free(*out).
+outsize: Output parameter. Pointer to the size in bytes of the out buffer.
+image: The raw pixel data to encode. The size of this buffer should be
+       w * h * (bytes per pixel), bytes per pixel depends on colortype and bitdepth.
+w: width of the raw pixel data in pixels.
+h: height of the raw pixel data in pixels.
+colortype: the color type of the raw input image. See explanation on PNG color types.
+bitdepth: the bit depth of the raw input image. See explanation on PNG color types.
+Return value: png error code (0 means no error).
+*/
+u32 png_encode_memory(u8 **out, u32 *outsize, const u8 *image, u32 w, u32 h, pngColorType colortype,
+		      u32 bitdepth);
+
+/*Same as png_encode_memory, but always encodes from 32-bit RGBA raw image.*/
+u32 png_encode32(u8 **out, u32 *outsize, const u8 *image, u32 w, u32 h);
+
+/*Same as png_encode_memory, but always encodes from 24-bit RGB raw image.*/
+u32 png_encode24(u8 **out, u32 *outsize, const u8 *image, u32 w, u32 h);
+
+#ifdef PNG_COMPILE_DISK
+/*
+Converts raw pixel data into a PNG file on disk.
+Same as the other encode functions, but instead takes a filename as output.
+NOTE: This overwrites existing files without warning!
+*/
+u32 png_encode_file(const char *filename, const u8 *image, u32 w, u32 h, pngColorType colortype,
+		    u32 bitdepth);
+
+/*Same as png_encode_file, but always encodes from 32-bit RGBA raw image.*/
+u32 png_encode32_file(const char *filename, const u8 *image, u32 w, u32 h);
+
+/*Same as png_encode_file, but always encodes from 24-bit RGB raw image.*/
+u32 png_encode24_file(const char *filename, const u8 *image, u32 w, u32 h);
+#endif /*PNG_COMPILE_DISK*/
+#endif /*PNG_COMPILE_ENCODER*/
+
+#ifdef PNG_COMPILE_CPP
+namespace png
+{
+#ifdef PNG_COMPILE_DECODER
+/*Same as png_decode_memory, but decodes to an std::vector. The colortype
+is the format to output the pixels to. Default is RGBA 8-bit per channel.*/
+u32 decode(std::vector<u8> &out, u32 &w, u32 &h, const u8 *in, u32 insize,
+	   pngColorType colortype = LCT_RGBA, u32 bitdepth = 8);
+u32 decode(std::vector<u8> &out, u32 &w, u32 &h, const std::vector<u8> &in,
+	   pngColorType colortype = LCT_RGBA, u32 bitdepth = 8);
+#ifdef PNG_COMPILE_DISK
+/*
+Converts PNG file from disk to raw pixel data in memory.
+Same as the other decode functions, but instead takes a filename as input.
+*/
+u32 decode(std::vector<u8> &out, u32 &w, u32 &h, const std::string &filename,
+	   pngColorType colortype = LCT_RGBA, u32 bitdepth = 8);
+#endif /* PNG_COMPILE_DISK */
+#endif /* PNG_COMPILE_DECODER */
+
+#ifdef PNG_COMPILE_ENCODER
+/*Same as png_encode_memory, but encodes to an std::vector. colortype
+is that of the raw input data. The output PNG color type will be auto chosen.*/
+u32 encode(std::vector<u8> &out, const u8 *in, u32 w, u32 h, pngColorType colortype = LCT_RGBA,
+	   u32 bitdepth = 8);
+u32 encode(std::vector<u8> &out, const std::vector<u8> &in, u32 w, u32 h,
+	   pngColorType colortype = LCT_RGBA, u32 bitdepth = 8);
+#ifdef PNG_COMPILE_DISK
+/*
+Converts 32-bit RGBA raw pixel data into a PNG file on disk.
+Same as the other encode functions, but instead takes a filename as output.
+NOTE: This overwrites existing files without warning!
+*/
+u32 encode(const std::string &filename, const u8 *in, u32 w, u32 h,
+	   pngColorType colortype = LCT_RGBA, u32 bitdepth = 8);
+u32 encode(const std::string &filename, const std::vector<u8> &in, u32 w, u32 h,
+	   pngColorType colortype = LCT_RGBA, u32 bitdepth = 8);
+#endif /* PNG_COMPILE_DISK */
+#endif /* PNG_COMPILE_ENCODER */
+} /* namespace png */
+#endif /*PNG_COMPILE_CPP*/
+#endif /*PNG_COMPILE_PNG*/
+
+#ifdef PNG_COMPILE_ERROR_TEXT
+/*Returns an English description of the numerical error code.*/
+const char *png_error_text(u32 code);
+#endif /*PNG_COMPILE_ERROR_TEXT*/
+
+#ifdef PNG_COMPILE_DECODER
+/*Settings for zlib decompression*/
+typedef struct pngDecompressSettings pngDecompressSettings;
+struct pngDecompressSettings {
+	/* Check pngDecoderSettings for more ignorable errors such as ignore_crc */
+	u32 ignore_adler32; /*if 1, continue and don't give an error message if the Adler32 checksum is corrupted*/
+	u32 ignore_nlen; /*ignore complement of len checksum in uncompressed blocks*/
+
+	/*Maximum decompressed size, beyond this the decoder may (and is encouraged to) stop decoding,
+  return an error, output a data size > max_output_size and all the data up to that point. This is
+  not hard limit nor a guarantee, but can prevent excessive memory usage. This setting is
+  ignored by the PNG decoder, but is used by the deflate/zlib decoder and can be used by custom ones.
+  Set to 0 to impose no limit (the default).*/
+	u32 max_output_size;
+
+	/*use custom zlib decoder instead of built in one (default: null).
+  Should return 0 if success, any non-0 if error (numeric value not exposed).*/
+	u32 (*custom_zlib)(u8 **, u32 *, const u8 *, u32, const pngDecompressSettings *);
+	/*use custom deflate decoder instead of built in one (default: null)
+  if custom_zlib is not null, custom_inflate is ignored (the zlib format uses deflate).
+  Should return 0 if success, any non-0 if error (numeric value not exposed).*/
+	u32 (*custom_inflate)(u8 **, u32 *, const u8 *, u32, const pngDecompressSettings *);
+
+	const void *custom_context; /*optional custom settings for custom functions*/
+};
+
+extern const pngDecompressSettings png_default_decompress_settings;
+void png_decompress_settings_init(pngDecompressSettings *settings);
+#endif /*PNG_COMPILE_DECODER*/
+
+#ifdef PNG_COMPILE_ENCODER
+/*
+Settings for zlib compression. Tweaking these settings tweaks the balance
+between speed and compression ratio.
+*/
+typedef struct pngCompressSettings pngCompressSettings;
+struct pngCompressSettings /*deflate = compress*/ {
+	/*LZ77 related settings*/
+	u32 btype; /*the block type for LZ (0, 1, 2 or 3, see zlib standard). Should be 2 for proper compression.*/
+	u32 use_lz77; /*whether or not to use LZ77. Should be 1 for proper compression.*/
+	u32 windowsize; /*must be a power of two <= 32768. higher compresses more but is slower. Default value: 2048.*/
+	u32 minmatch; /*minimum lz77 length. 3 is normally best, 6 can be better for some PNGs. Default: 0*/
+	u32 nicematch; /*stop searching if >= this length found. Set to 258 for best compression. Default: 128*/
+	u32 lazymatching; /*use lazy matching: better compression but a bit slower. Default: true*/
+
+	/*use custom zlib encoder instead of built in one (default: null)*/
+	u32 (*custom_zlib)(u8 **, u32 *, const u8 *, u32, const pngCompressSettings *);
+	/*use custom deflate encoder instead of built in one (default: null)
+  if custom_zlib is used, custom_deflate is ignored since only the built in
+  zlib function will call custom_deflate*/
+	u32 (*custom_deflate)(u8 **, u32 *, const u8 *, u32, const pngCompressSettings *);
+
+	const void *custom_context; /*optional custom settings for custom functions*/
+};
+
+extern const pngCompressSettings png_default_compress_settings;
+void png_compress_settings_init(pngCompressSettings *settings);
+#endif /*PNG_COMPILE_ENCODER*/
+
+#ifdef PNG_COMPILE_PNG
+/*
+Color mode of an image. Contains all information required to decode the pixel
+bits to RGBA colors. This information is the same as used in the PNG file
+format, and is used both for PNG and raw image data in png.
+*/
+typedef struct pngColorMode {
+	/*header (IHDR)*/
+	pngColorType
+		colortype; /*color type, see PNG standard or documentation further in this header file*/
+	u32 bitdepth; /*bits per sample, see PNG standard or documentation further in this header file*/
+
+	/*
+  palette (PLTE and tRNS)
+
+  Dynamically allocated with the colors of the palette, including alpha.
+  This field may not be allocated directly, use png_color_mode_init first,
+  then png_palette_add per color to correctly initialize it (to ensure size
+  of exactly 1024 bytes).
+
+  The alpha channels must be set as well, set them to 255 for opaque images.
+
+  When decoding, by default you can ignore this palette, since png already
+  fills the palette colors in the pixels of the raw RGBA output.
+
+  The palette is only supported for color type 3.
+  */
+	u8 *palette; /*palette in RGBARGBA... order. Must be either 0, or when allocated must have 1024 bytes*/
+	u32 palettesize; /*palette size in number of colors (amount of used bytes is 4 * palettesize)*/
+
+	/*
+  transparent color key (tRNS)
+
+  This color uses the same bit depth as the bitdepth value in this struct, which can be 1-bit to 16-bit.
+  For grayscale PNGs, r, g and b will all 3 be set to the same.
+
+  When decoding, by default you can ignore this information, since png sets
+  pixels with this key to transparent already in the raw RGBA output.
+
+  The color key is only supported for color types 0 and 2.
+  */
+	u32 key_defined; /*is a transparent color key given? 0 = false, 1 = true*/
+	u32 key_r; /*red/grayscale component of color key*/
+	u32 key_g; /*green component of color key*/
+	u32 key_b; /*blue component of color key*/
+} pngColorMode;
+
+/*init, cleanup and copy functions to use with this struct*/
+void png_color_mode_init(pngColorMode *info);
+void png_color_mode_cleanup(pngColorMode *info);
+/*return value is error code (0 means no error)*/
+u32 png_color_mode_copy(pngColorMode *dest, const pngColorMode *source);
+/* Makes a temporary pngColorMode that does not need cleanup (no palette) */
+pngColorMode png_color_mode_make(pngColorType colortype, u32 bitdepth);
+
+void png_palette_clear(pngColorMode *info);
+/*add 1 color to the palette*/
+u32 png_palette_add(pngColorMode *info, u8 r, u8 g, u8 b, u8 a);
+
+/*get the total amount of bits per pixel, based on colortype and bitdepth in the struct*/
+u32 png_get_bpp(const pngColorMode *info);
+/*get the amount of color channels used, based on colortype in the struct.
+If a palette is used, it counts as 1 channel.*/
+u32 png_get_channels(const pngColorMode *info);
+/*is it a grayscale type? (only colortype 0 or 4)*/
+u32 png_is_greyscale_type(const pngColorMode *info);
+/*has it got an alpha channel? (only colortype 2 or 6)*/
+u32 png_is_alpha_type(const pngColorMode *info);
+/*has it got a palette? (only colortype 3)*/
+u32 png_is_palette_type(const pngColorMode *info);
+/*only returns true if there is a palette and there is a value in the palette with alpha < 255.
+Loops through the palette to check this.*/
+u32 png_has_palette_alpha(const pngColorMode *info);
+/*
+Check if the given color info indicates the possibility of having non-opaque pixels in the PNG image.
+Returns true if the image can have translucent or invisible pixels (it still be opaque if it doesn't use such pixels).
+Returns false if the image can only have opaque pixels.
+In detail, it returns true only if it's a color type with alpha, or has a palette with non-opaque values,
+or if "key_defined" is true.
+*/
+u32 png_can_have_alpha(const pngColorMode *info);
+/*Returns the byte size of a raw image buffer with given width, height and color mode*/
+u32 png_get_raw_size(u32 w, u32 h, const pngColorMode *color);
+
+#ifdef PNG_COMPILE_ANCILLARY_CHUNKS
+/*The information of a Time chunk in PNG.*/
+typedef struct pngTime {
+	u32 year; /*2 bytes used (0-65535)*/
+	u32 month; /*1-12*/
+	u32 day; /*1-31*/
+	u32 hour; /*0-23*/
+	u32 minute; /*0-59*/
+	u32 second; /*0-60 (to allow for leap seconds)*/
+} pngTime;
+#endif /*PNG_COMPILE_ANCILLARY_CHUNKS*/
+
+/*Information about the PNG image, except pixels, width and height.*/
+typedef struct pngInfo {
+	/*header (IHDR), palette (PLTE) and transparency (tRNS) chunks*/
+	u32 compression_method; /*compression method of the original file. Always 0.*/
+	u32 filter_method; /*filter method of the original file*/
+	u32 interlace_method; /*interlace method of the original file: 0=none, 1=Adam7*/
+	pngColorMode color; /*color type and bits, palette and transparency of the PNG file*/
+
+#ifdef PNG_COMPILE_ANCILLARY_CHUNKS
+	/*
+  Suggested background color chunk (bKGD)
+
+  This uses the same color mode and bit depth as the PNG (except no alpha channel),
+  with values truncated to the bit depth in the u32 integer.
+
+  For grayscale and palette PNGs, the value is stored in background_r. The values
+  in background_g and background_b are then unused.
+
+  So when decoding, you may get these in a different color mode than the one you requested
+  for the raw pixels.
+
+  When encoding with auto_convert, you must use the color model defined in info_png.color for
+  these values. The encoder normally ignores info_png.color when auto_convert is on, but will
+  use it to interpret these values (and convert copies of them to its chosen color model).
+
+  When encoding, avoid setting this to an expensive color, such as a non-gray value
+  when the image is gray, or the compression will be worse since it will be forced to
+  write the PNG with a more expensive color mode (when auto_convert is on).
+
+  The decoder does not use this background color to edit the color of pixels. This is a
+  completely optional metadata feature.
+  */
+	u32 background_defined; /*is a suggested background color given?*/
+	u32 background_r; /*red/gray/palette component of suggested background color*/
+	u32 background_g; /*green component of suggested background color*/
+	u32 background_b; /*blue component of suggested background color*/
+
+	/*
+  Non-international text chunks (tEXt and zTXt)
+
+  The char** arrays each contain num strings. The actual messages are in
+  text_strings, while text_keys are keywords that give a short description what
+  the actual text represents, e.g. Title, Author, Description, or anything else.
+
+  All the string fields below including strings, keys, names and language tags are null terminated.
+  The PNG specification uses null characters for the keys, names and tags, and forbids null
+  characters to appear in the main text which is why we can use null termination everywhere here.
+
+  A keyword is minimum 1 character and maximum 79 characters long (plus the
+  additional null terminator). It's discouraged to use a single line length
+  longer than 79 characters for texts.
+
+  Don't allocate these text buffers yourself. Use the init/cleanup functions
+  correctly and use png_add_text and png_clear_text.
+
+  Standard text chunk keywords and strings are encoded using Latin-1.
+  */
+	u32 text_num; /*the amount of texts in these char** buffers (there may be more texts in itext)*/
+	char **text_keys; /*the keyword of a text chunk (e.g. "Comment")*/
+	char **text_strings; /*the actual text*/
+
+	/*
+  International text chunks (iTXt)
+  Similar to the non-international text chunks, but with additional strings
+  "langtags" and "transkeys", and the following text encodings are used:
+  keys: Latin-1, langtags: ASCII, transkeys and strings: UTF-8.
+  keys must be 1-79 characters (plus the additional null terminator), the other
+  strings are any length.
+  */
+	u32 itext_num; /*the amount of international texts in this PNG*/
+	char **itext_keys; /*the English keyword of the text chunk (e.g. "Comment")*/
+	char **itext_langtags; /*language tag for this text's language, ISO/IEC 646 string, e.g. ISO 639 language tag*/
+	char **itext_transkeys; /*keyword translated to the international language - UTF-8 string*/
+	char **itext_strings; /*the actual international text - UTF-8 string*/
+
+	/*time chunk (tIME)*/
+	u32 time_defined; /*set to 1 to make the encoder generate a tIME chunk*/
+	pngTime time;
+
+	/*phys chunk (pHYs)*/
+	u32 phys_defined; /*if 0, there is no pHYs chunk and the values below are undefined, if 1 else there is one*/
+	u32 phys_x; /*pixels per unit in x direction*/
+	u32 phys_y; /*pixels per unit in y direction*/
+	u32 phys_unit; /*may be 0 (unknown unit) or 1 (metre)*/
+
+	/*
+  Color profile related chunks: gAMA, cHRM, sRGB, iCPP
+
+  png does not apply any color conversions on pixels in the encoder or decoder and does not interpret these color
+  profile values. It merely passes on the information. If you wish to use color profiles and convert colors, please
+  use these values with a color management library.
+
+  See the PNG, ICC and sRGB specifications for more information about the meaning of these values.
+  */
+
+	/* gAMA chunk: optional, overridden by sRGB or iCCP if those are present. */
+	u32 gama_defined; /* Whether a gAMA chunk is present (0 = not present, 1 = present). */
+	u32 gama_gamma; /* Gamma exponent times 100000 */
+
+	/* cHRM chunk: optional, overridden by sRGB or iCCP if those are present. */
+	u32 chrm_defined; /* Whether a cHRM chunk is present (0 = not present, 1 = present). */
+	u32 chrm_white_x; /* White Point x times 100000 */
+	u32 chrm_white_y; /* White Point y times 100000 */
+	u32 chrm_red_x; /* Red x times 100000 */
+	u32 chrm_red_y; /* Red y times 100000 */
+	u32 chrm_green_x; /* Green x times 100000 */
+	u32 chrm_green_y; /* Green y times 100000 */
+	u32 chrm_blue_x; /* Blue x times 100000 */
+	u32 chrm_blue_y; /* Blue y times 100000 */
+
+	/*
+  sRGB chunk: optional. May not appear at the same time as iCCP.
+  If gAMA is also present gAMA must contain value 45455.
+  If cHRM is also present cHRM must contain respectively 31270,32900,64000,33000,30000,60000,15000,6000.
+  */
+	u32 srgb_defined; /* Whether an sRGB chunk is present (0 = not present, 1 = present). */
+	u32 srgb_intent; /* Rendering intent: 0=perceptual, 1=rel. colorimetric, 2=saturation, 3=abs. colorimetric */
+
+	/*
+  iCCP chunk: optional. May not appear at the same time as sRGB.
+
+  png does not parse or use the ICC profile (except its color space header field for an edge case), a
+  separate library to handle the ICC data (not included in png) format is needed to use it for color
+  management and conversions.
+
+  For encoding, if iCCP is present, gAMA and cHRM are recommended to be added as well with values that match the ICC
+  profile as closely as possible, if you wish to do this you should provide the correct values for gAMA and cHRM and
+  enable their '_defined' flags since png will not automatically compute them from the ICC profile.
+
+  For encoding, the ICC profile is required by the PNG specification to be an "RGB" profile for non-gray
+  PNG color types and a "GRAY" profile for gray PNG color types. If you disable auto_convert, you must ensure
+  the ICC profile type matches your requested color type, else the encoder gives an error. If auto_convert is
+  enabled (the default), and the ICC profile is not a good match for the pixel data, this will result in an encoder
+  error if the pixel data has non-gray pixels for a GRAY profile, or a silent less-optimal compression of the pixel
+  data if the pixels could be encoded as grayscale but the ICC profile is RGB.
+
+  To avoid this do not set an ICC profile in the image unless there is a good reason for it, and when doing so
+  make sure you compute it carefully to avoid the above problems.
+  */
+	u32 iccp_defined; /* Whether an iCCP chunk is present (0 = not present, 1 = present). */
+	char *iccp_name; /* Null terminated string with profile name, 1-79 bytes */
+	/*
+  The ICC profile in iccp_profile_size bytes.
+  Don't allocate this buffer yourself. Use the init/cleanup functions
+  correctly and use png_set_icc and png_clear_icc.
+  */
+	u8 *iccp_profile;
+	u32 iccp_profile_size; /* The size of iccp_profile in bytes */
+
+	/* End of color profile related chunks */
+
+	/*
+  unknown chunks: chunks not known by png, passed on byte for byte.
+
+  There are 3 buffers, one for each position in the PNG where unknown chunks can appear.
+  Each buffer contains all unknown chunks for that position consecutively.
+  The 3 positions are:
+  0: between IHDR and PLTE, 1: between PLTE and IDAT, 2: between IDAT and IEND.
+
+  For encoding, do not store critical chunks or known chunks that are enabled with a "_defined" flag
+  above in here, since the encoder will blindly follow this and could then encode an invalid PNG file
+  (such as one with two IHDR chunks or the disallowed combination of sRGB with iCCP). But do use
+  this if you wish to store an ancillary chunk that is not supported by png (such as sPLT or hIST),
+  or any non-standard PNG chunk.
+
+  Do not allocate or traverse this data yourself. Use the chunk traversing functions declared
+  later, such as png_chunk_next and png_chunk_append, to read/write this struct.
+  */
+	u8 *unknown_chunks_data[3];
+	u32 unknown_chunks_size[3]; /*size in bytes of the unknown chunks, given for protection*/
+#endif /*PNG_COMPILE_ANCILLARY_CHUNKS*/
+} pngInfo;
+
+/*init, cleanup and copy functions to use with this struct*/
+void png_info_init(pngInfo *info);
+void png_info_cleanup(pngInfo *info);
+/*return value is error code (0 means no error)*/
+u32 png_info_copy(pngInfo *dest, const pngInfo *source);
+
+#ifdef PNG_COMPILE_ANCILLARY_CHUNKS
+u32 png_add_text(pngInfo *info, const char *key, const char *str); /*push back both texts at once*/
+void png_clear_text(pngInfo *info); /*use this to clear the texts again after you filled them in*/
+
+u32 png_add_itext(pngInfo *info, const char *key, const char *langtag, const char *transkey,
+		  const char *str); /*push back the 4 texts of 1 chunk at once*/
+void png_clear_itext(pngInfo *info); /*use this to clear the itexts again after you filled them in*/
+
+/*replaces if exists*/
+u32 png_set_icc(pngInfo *info, const char *name, const u8 *profile, u32 profile_size);
+void png_clear_icc(pngInfo *info); /*use this to clear the texts again after you filled them in*/
+#endif /*PNG_COMPILE_ANCILLARY_CHUNKS*/
+
+/*
+Converts raw buffer from one color type to another color type, based on
+pngColorMode structs to describe the input and output color type.
+See the reference manual at the end of this header file to see which color conversions are supported.
+return value = png error code (0 if all went ok, an error if the conversion isn't supported)
+The out buffer must have size (w * h * bpp + 7) / 8, where bpp is the bits per pixel
+of the output color type (png_get_bpp).
+For < 8 bpp images, there should not be padding bits at the end of scanlines.
+For 16-bit per channel colors, uses big endian format like PNG does.
+Return value is png error code
+*/
+u32 png_convert(u8 *out, const u8 *in, const pngColorMode *mode_out, const pngColorMode *mode_in,
+		u32 w, u32 h);
+
+#ifdef PNG_COMPILE_DECODER
+/*
+Settings for the decoder. This contains settings for the PNG and the Zlib
+decoder, but not the Info settings from the Info structs.
+*/
+typedef struct pngDecoderSettings {
+	pngDecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/
+
+	/* Check pngDecompressSettings for more ignorable errors such as ignore_adler32 */
+	u32 ignore_crc; /*ignore CRC checksums*/
+	u32 ignore_critical; /*ignore unknown critical chunks*/
+	u32 ignore_end; /*ignore issues at end of file if possible (missing IEND chunk, too large chunk, ...)*/
+	/* TODO: make a system involving warnings with levels and a strict mode instead. Other potentially recoverable
+     errors: srgb rendering intent value, size of content of ancillary chunks, more than 79 characters for some
+     strings, placement/combination rules for ancillary chunks, crc of unknown chunks, allowed characters
+     in string keys, etc... */
+
+	u32 color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/
+
+#ifdef PNG_COMPILE_ANCILLARY_CHUNKS
+	u32 read_text_chunks; /*if false but remember_unknown_chunks is true, they're stored in the unknown chunks*/
+
+	/*store all bytes from unknown chunks in the pngInfo (off by default, useful for a png editor)*/
+	u32 remember_unknown_chunks;
+
+	/* maximum size for decompressed text chunks. If a text chunk's text is larger than this, an error is returned,
+  unless reading text chunks is disabled or this limit is set higher or disabled. Set to 0 to allow any size.
+  By default it is a value that prevents unreasonably large strings from hogging memory. */
+	u32 max_text_size;
+
+	/* maximum size for compressed ICC chunks. If the ICC profile is larger than this, an error will be returned. Set to
+  0 to allow any size. By default this is a value that prevents ICC profiles that would be much larger than any
+  legitimate profile could be to hog memory. */
+	u32 max_icc_size;
+#endif /*PNG_COMPILE_ANCILLARY_CHUNKS*/
+} pngDecoderSettings;
+
+void png_decoder_settings_init(pngDecoderSettings *settings);
+#endif /*PNG_COMPILE_DECODER*/
+
+#ifdef PNG_COMPILE_ENCODER
+/*automatically use color type with less bits per pixel if losslessly possible. Default: AUTO*/
+typedef enum pngFilterStrategy {
+	/*every filter at zero*/
+	LFS_ZERO = 0,
+	/*every filter at 1, 2, 3 or 4 (paeth), unlike LFS_ZERO not a good choice, but for testing*/
+	LFS_ONE = 1,
+	LFS_TWO = 2,
+	LFS_THREE = 3,
+	LFS_FOUR = 4,
+	/*Use filter that gives minimum sum, as described in the official PNG filter heuristic.*/
+	LFS_MINSUM,
+	/*Use the filter type that gives smallest Shannon entropy for this scanline. Depending
+  on the image, this is better or worse than minsum.*/
+	LFS_ENTROPY,
+	/*
+  Brute-force-search PNG filters by compressing each filter for each scanline.
+  Experimental, very slow, and only rarely gives better compression than MINSUM.
+  */
+	LFS_BRUTE_FORCE,
+	/*use predefined_filters buffer: you specify the filter type for each scanline*/
+	LFS_PREDEFINED
+} pngFilterStrategy;
+
+/*Gives characteristics about the integer RGBA colors of the image (count, alpha channel usage, bit depth, ...),
+which helps decide which color model to use for encoding.
+Used internally by default if "auto_convert" is enabled. Public because it's useful for custom algorithms.*/
+typedef struct pngColorStats {
+	u32 colored; /*not grayscale*/
+	u32 key; /*image is not opaque and color key is possible instead of full alpha*/
+	u16 key_r; /*key values, always as 16-bit, in 8-bit case the byte is duplicated, e.g. 65535 means 255*/
+	u16 key_g;
+	u16 key_b;
+	u32 alpha; /*image is not opaque and alpha channel or alpha palette required*/
+	u32 numcolors; /*amount of colors, up to 257. Not valid if bits == 16 or allow_palette is disabled.*/
+	u8 palette[1024]; /*Remembers up to the first 256 RGBA colors, in no particular order, only valid when numcolors is valid*/
+	u32 bits; /*bits per channel (not for palette). 1,2 or 4 for grayscale only. 16 if 16-bit per channel required.*/
+	u32 numpixels;
+
+	/*user settings for computing/using the stats*/
+	u32 allow_palette; /*default 1. if 0, disallow choosing palette colortype in auto_choose_color, and don't count numcolors*/
+	u32 allow_greyscale; /*default 1. if 0, choose RGB or RGBA even if the image only has gray colors*/
+} pngColorStats;
+
+void png_color_stats_init(pngColorStats *stats);
+
+/*Get a pngColorStats of the image. The stats must already have been inited.
+Returns error code (e.g. alloc fail) or 0 if ok.*/
+u32 png_compute_color_stats(pngColorStats *stats, const u8 *image, u32 w, u32 h,
+			    const pngColorMode *mode_in);
+
+/*Settings for the encoder.*/
+typedef struct pngEncoderSettings {
+	pngCompressSettings zlibsettings; /*settings for the zlib encoder, such as window size, ...*/
+
+	u32 auto_convert; /*automatically choose output PNG color type. Default: true*/
+
+	/*If true, follows the official PNG heuristic: if the PNG uses a palette or lower than
+  8 bit depth, set all filters to zero. Otherwise use the filter_strategy. Note that to
+  completely follow the official PNG heuristic, filter_palette_zero must be true and
+  filter_strategy must be LFS_MINSUM*/
+	u32 filter_palette_zero;
+	/*Which filter strategy to use when not using zeroes due to filter_palette_zero.
+  Set filter_palette_zero to 0 to ensure always using your chosen strategy. Default: LFS_MINSUM*/
+	pngFilterStrategy filter_strategy;
+	/*used if filter_strategy is LFS_PREDEFINED. In that case, this must point to a buffer with
+  the same length as the amount of scanlines in the image, and each value must <= 5. You
+  have to cleanup this buffer, png will never free it. Don't forget that filter_palette_zero
+  must be set to 0 to ensure this is also used on palette or low bitdepth images.*/
+	const u8 *predefined_filters;
+
+	/*force creating a PLTE chunk if colortype is 2 or 6 (= a suggested palette).
+  If colortype is 3, PLTE is _always_ created.*/
+	u32 force_palette;
+#ifdef PNG_COMPILE_ANCILLARY_CHUNKS
+	/*add png identifier and version as a text chunk, for debugging*/
+	u32 add_id;
+	/*encode text chunks as zTXt chunks instead of tEXt chunks, and use compression in iTXt chunks*/
+	u32 text_compression;
+#endif /*PNG_COMPILE_ANCILLARY_CHUNKS*/
+} pngEncoderSettings;
+
+void png_encoder_settings_init(pngEncoderSettings *settings);
+#endif /*PNG_COMPILE_ENCODER*/
+
+#if defined(PNG_COMPILE_DECODER) || defined(PNG_COMPILE_ENCODER)
+/*The settings, state and information for extended encoding and decoding.*/
+typedef struct pngState {
+#ifdef PNG_COMPILE_DECODER
+	pngDecoderSettings decoder; /*the decoding settings*/
+#endif /*PNG_COMPILE_DECODER*/
+#ifdef PNG_COMPILE_ENCODER
+	pngEncoderSettings encoder; /*the encoding settings*/
+#endif /*PNG_COMPILE_ENCODER*/
+	pngColorMode
+		info_raw; /*specifies the format in which you would like to get the raw pixel buffer*/
+	pngInfo info_png; /*info of the PNG image obtained after decoding*/
+	u32 error;
+} pngState;
+
+/*init, cleanup and copy functions to use with this struct*/
+void png_state_init(pngState *state);
+void png_state_cleanup(pngState *state);
+void png_state_copy(pngState *dest, const pngState *source);
+#endif /* defined(PNG_COMPILE_DECODER) || defined(PNG_COMPILE_ENCODER) */
+
+#ifdef PNG_COMPILE_DECODER
+/*
+Same as png_decode_memory, but uses a pngState to allow custom settings and
+getting much more information about the PNG image and color mode.
+*/
+u32 png_decode(u8 **out, u32 *w, u32 *h, pngState *state, const u8 *in, u32 insize);
+
+/*
+Read the PNG header, but not the actual data. This returns only the information
+that is in the IHDR chunk of the PNG, such as width, height and color type. The
+information is placed in the info_png field of the pngState.
+*/
+u32 png_inspect(u32 *w, u32 *h, pngState *state, const u8 *in, u32 insize);
+#endif /*PNG_COMPILE_DECODER*/
+
+/*
+Reads one metadata chunk (other than IHDR) of the PNG file and outputs what it
+read in the state. Returns error code on failure.
+Use png_inspect first with a new state, then e.g. png_chunk_find_const
+to find the desired chunk type, and if non null use png_inspect_chunk (with
+chunk_pointer - start_of_file as pos).
+Supports most metadata chunks from the PNG standard (gAMA, bKGD, tEXt, ...).
+Ignores unsupported, unknown, non-metadata or IHDR chunks (without error).
+Requirements: &in[pos] must point to start of a chunk, must use regular
+png_inspect first since format of most other chunks depends on IHDR, and if
+there is a PLTE chunk, that one must be inspected before tRNS or bKGD.
+*/
+u32 png_inspect_chunk(pngState *state, u32 pos, const u8 *in, u32 insize);
+
+#ifdef PNG_COMPILE_ENCODER
+/*This function allocates the out buffer with standard malloc and stores the size in *outsize.*/
+u32 png_encode(u8 **out, u32 *outsize, const u8 *image, u32 w, u32 h, pngState *state);
+#endif /*PNG_COMPILE_ENCODER*/
+
+/*
+The png_chunk functions are normally not needed, except to traverse the
+unknown chunks stored in the pngInfo struct, or add new ones to it.
+It also allows traversing the chunks of an encoded PNG file yourself.
+
+The chunk pointer always points to the beginning of the chunk itself, that is
+the first byte of the 4 length bytes.
+
+In the PNG file format, chunks have the following format:
+-4 bytes length: length of the data of the chunk in bytes (chunk itself is 12 bytes longer)
+-4 bytes chunk type (ASCII a-z,A-Z only, see below)
+-length bytes of data (may be 0 bytes if length was 0)
+-4 bytes of CRC, computed on chunk name + data
+
+The first chunk starts at the 8th byte of the PNG file, the entire rest of the file
+exists out of concatenated chunks with the above format.
+
+PNG standard chunk ASCII naming conventions:
+-First byte: uppercase = critical, lowercase = ancillary
+-Second byte: uppercase = public, lowercase = private
+-Third byte: must be uppercase
+-Fourth byte: uppercase = unsafe to copy, lowercase = safe to copy
+*/
+
+/*
+Gets the length of the data of the chunk. Total chunk length has 12 bytes more.
+There must be at least 4 bytes to read from. If the result value is too large,
+it may be corrupt data.
+*/
+u32 png_chunk_length(const u8 *chunk);
+
+/*puts the 4-byte type in null terminated string*/
+void png_chunk_type(char type[5], const u8 *chunk);
+
+/*check if the type is the given type*/
+u8 png_chunk_type_equals(const u8 *chunk, const char *type);
+
+/*0: it's one of the critical chunk types, 1: it's an ancillary chunk (see PNG standard)*/
+u8 png_chunk_ancillary(const u8 *chunk);
+
+/*0: public, 1: private (see PNG standard)*/
+u8 png_chunk_private(const u8 *chunk);
+
+/*0: the chunk is unsafe to copy, 1: the chunk is safe to copy (see PNG standard)*/
+u8 png_chunk_safetocopy(const u8 *chunk);
+
+/*get pointer to the data of the chunk, where the input points to the header of the chunk*/
+u8 *png_chunk_data(u8 *chunk);
+const u8 *png_chunk_data_const(const u8 *chunk);
+
+/*returns 0 if the crc is correct, 1 if it's incorrect (0 for OK as usual!)*/
+u32 png_chunk_check_crc(const u8 *chunk);
+
+/*generates the correct CRC from the data and puts it in the last 4 bytes of the chunk*/
+void png_chunk_generate_crc(u8 *chunk);
+
+/*
+Iterate to next chunks, allows iterating through all chunks of the PNG file.
+Input must be at the beginning of a chunk (result of a previous png_chunk_next call,
+or the 8th byte of a PNG file which always has the first chunk), or alternatively may
+point to the first byte of the PNG file (which is not a chunk but the magic header, the
+function will then skip over it and return the first real chunk).
+Will output pointer to the start of the next chunk, or at or beyond end of the file if there
+is no more chunk after this or possibly if the chunk is corrupt.
+Start this process at the 8th byte of the PNG file.
+In a non-corrupt PNG file, the last chunk should have name "IEND".
+*/
+u8 *png_chunk_next(u8 *chunk, u8 *end);
+const u8 *png_chunk_next_const(const u8 *chunk, const u8 *end);
+
+/*Finds the first chunk with the given type in the range [chunk, end), or returns NULL if not found.*/
+u8 *png_chunk_find(u8 *chunk, u8 *end, const char type[5]);
+const u8 *png_chunk_find_const(const u8 *chunk, const u8 *end, const char type[5]);
+
+/*
+Appends chunk to the data in out. The given chunk should already have its chunk header.
+The out variable and outsize are updated to reflect the new reallocated buffer.
+Returns error code (0 if it went ok)
+*/
+u32 png_chunk_append(u8 **out, u32 *outsize, const u8 *chunk);
+
+/*
+Appends new chunk to out. The chunk to append is given by giving its length, type
+and data separately. The type is a 4-letter string.
+The out variable and outsize are updated to reflect the new reallocated buffer.
+Returne error code (0 if it went ok)
+*/
+u32 png_chunk_create(u8 **out, u32 *outsize, u32 length, const char *type, const u8 *data);
+
+/*Calculate CRC32 of buffer*/
+u32 png_crc32(const u8 *buf, u32 len);
+#endif /*PNG_COMPILE_PNG*/
+
+#ifdef PNG_COMPILE_ZLIB
+/*
+This zlib part can be used independently to zlib compress and decompress a
+buffer. It cannot be used to create gzip files however, and it only supports the
+part of zlib that is required for PNG, it does not support dictionaries.
+*/
+
+#ifdef PNG_COMPILE_DECODER
+/*Inflate a buffer. Inflate is the decompression step of deflate. Out buffer must be freed after use.*/
+u32 png_inflate(u8 **out, u32 *outsize, const u8 *in, u32 insize,
+		const pngDecompressSettings *settings);
+
+/*
+Decompresses Zlib data. Reallocates the out buffer and appends the data. The
+data must be according to the zlib specification.
+Either, *out must be NULL and *outsize must be 0, or, *out must be a valid
+buffer and *outsize its size in bytes. out must be freed by user after usage.
+*/
+u32 png_zlib_decompress(u8 **out, u32 *outsize, const u8 *in, u32 insize,
+			const pngDecompressSettings *settings);
+#endif /*PNG_COMPILE_DECODER*/
+
+#ifdef PNG_COMPILE_ENCODER
+/*
+Compresses data with Zlib. Reallocates the out buffer and appends the data.
+Zlib adds a small header and trailer around the deflate data.
+The data is output in the format of the zlib specification.
+Either, *out must be NULL and *outsize must be 0, or, *out must be a valid
+buffer and *outsize its size in bytes. out must be freed by user after usage.
+*/
+u32 png_zlib_compress(u8 **out, u32 *outsize, const u8 *in, u32 insize,
+		      const pngCompressSettings *settings);
+
+/*
+Find length-limited Huffman code for given frequencies. This function is in the
+public interface only for tests, it's used internally by png_deflate.
+*/
+u32 png_huffman_code_lengths(u32 *lengths, const u32 *frequencies, u32 numcodes, u32 maxbitlen);
+
+/*Compress a buffer with deflate. See RFC 1951. Out buffer must be freed after use.*/
+u32 png_deflate(u8 **out, u32 *outsize, const u8 *in, u32 insize,
+		const pngCompressSettings *settings);
+
+#endif /*PNG_COMPILE_ENCODER*/
+#endif /*PNG_COMPILE_ZLIB*/
+
+#ifdef PNG_COMPILE_DISK
+/*
+Load a file from disk into buffer. The function allocates the out buffer, and
+after usage you should free it.
+out: output parameter, contains pointer to loaded buffer.
+outsize: output parameter, size of the allocated out buffer
+filename: the path to the file to load
+return value: error code (0 means ok)
+*/
+u32 png_load_file(u8 **out, u32 *outsize, const char *filename);
+
+/*
+Save a file from buffer to disk. Warning, if it exists, this function overwrites
+the file without warning!
+buffer: the buffer to write
+buffersize: size of the buffer to write
+filename: the path to the file to save to
+return value: error code (0 means ok)
+*/
+u32 png_save_file(const u8 *buffer, u32 buffersize, const char *filename);
+#endif /*PNG_COMPILE_DISK*/
+
+#ifdef PNG_COMPILE_CPP
+/* The png C++ wrapper uses std::vectors instead of manually allocated memory buffers. */
+namespace png
+{
+#ifdef PNG_COMPILE_PNG
+class State : public pngState {
+    public:
+	State();
+	State(const State &other);
+	~State();
+	State &operator=(const State &other);
+};
+
+#ifdef PNG_COMPILE_DECODER
+/* Same as other png::decode, but using a State for more settings and information. */
+u32 decode(std::vector<u8> &out, u32 &w, u32 &h, State &state, const u8 *in, u32 insize);
+u32 decode(std::vector<u8> &out, u32 &w, u32 &h, State &state, const std::vector<u8> &in);
+#endif /*PNG_COMPILE_DECODER*/
+
+#ifdef PNG_COMPILE_ENCODER
+/* Same as other png::encode, but using a State for more settings and information. */
+u32 encode(std::vector<u8> &out, const u8 *in, u32 w, u32 h, State &state);
+u32 encode(std::vector<u8> &out, const std::vector<u8> &in, u32 w, u32 h, State &state);
+#endif /*PNG_COMPILE_ENCODER*/
+
+#ifdef PNG_COMPILE_DISK
+/*
+Load a file from disk into an std::vector.
+return value: error code (0 means ok)
+*/
+u32 load_file(std::vector<u8> &buffer, const std::string &filename);
+
+/*
+Save the binary data in an std::vector to a file on disk. The file is overwritten
+without warning.
+*/
+u32 save_file(const std::vector<u8> &buffer, const std::string &filename);
+#endif /* PNG_COMPILE_DISK */
+#endif /* PNG_COMPILE_PNG */
+
+#ifdef PNG_COMPILE_ZLIB
+#ifdef PNG_COMPILE_DECODER
+/* Zlib-decompress an u8 buffer */
+u32 decompress(std::vector<u8> &out, const u8 *in, u32 insize,
+	       const pngDecompressSettings &settings = png_default_decompress_settings);
+
+/* Zlib-decompress an std::vector */
+u32 decompress(std::vector<u8> &out, const std::vector<u8> &in,
+	       const pngDecompressSettings &settings = png_default_decompress_settings);
+#endif /* PNG_COMPILE_DECODER */
+
+#ifdef PNG_COMPILE_ENCODER
+/* Zlib-compress an u8 buffer */
+u32 compress(std::vector<u8> &out, const u8 *in, u32 insize,
+	     const pngCompressSettings &settings = png_default_compress_settings);
+
+/* Zlib-compress an std::vector */
+u32 compress(std::vector<u8> &out, const std::vector<u8> &in,
+	     const pngCompressSettings &settings = png_default_compress_settings);
+#endif /* PNG_COMPILE_ENCODER */
+#endif /* PNG_COMPILE_ZLIB */
+} /* namespace png */
+#endif /*PNG_COMPILE_CPP*/
+
+/*
+TODO:
+[.] test if there are no memory leaks or security exploits - done a lot but needs to be checked often
+[.] check compatibility with various compilers  - done but needs to be redone for every newer version
+[X] converting color to 16-bit per channel types
+[X] support color profile chunk types (but never let them touch RGB values by default)
+[ ] support all public PNG chunk types (almost done except sBIT, sPLT and hIST)
+[ ] make sure encoder generates no chunks with size > (2^31)-1
+[ ] partial decoding (stream processing)
+[X] let the "isFullyOpaque" function check color keys and transparent palettes too
+[X] better name for the variables "codes", "codesD", "codelengthcodes", "clcl" and "lldl"
+[ ] allow treating some errors like warnings, when image is recoverable (e.g. 69, 57, 58)
+[ ] make warnings like: oob palette, checksum fail, data after iend, wrong/unknown crit chunk, no null terminator in text, ...
+[ ] error messages with line numbers (and version)
+[ ] errors in state instead of as return code?
+[ ] new errors/warnings like suspiciously big decompressed ztxt or iccp chunk
+[ ] let the C++ wrapper catch exceptions coming from the standard library and return png error codes
+[ ] allow user to provide custom color conversion functions, e.g. for premultiplied alpha, padding bits or not, ...
+[ ] allow user to give data (void*) to custom allocator
+[X] provide alternatives for C library functions not present on some platforms (memcpy, ...)
+*/
+
+#endif /*PNG_H inclusion guard*/