aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--.gitignore23
-rw-r--r--COPYING674
-rw-r--r--src/10deg391
-rw-r--r--src/blackbody.c130
-rw-r--r--src/blackbody.h51
-rw-r--r--src/parse_10deg.c96
-rw-r--r--src/solar.c312
-rw-r--r--src/solar.h107
8 files changed, 1784 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..892d3ac
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,23 @@
+_/
+/bin/
+/aux/
+/obj/
+\#*\#
+.*
+!.git*
+*~
+*.bak
+*.new
+*.swo
+*.swp
+*.out
+*.o
+*.su
+*.gch
+*.info
+*.pdf
+*.ps
+*.dvi
+/config.status
+/Makefile
+
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+ The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works. By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users. We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors. You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+ To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights. Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+ For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received. You must make sure that they, too, receive
+or can get the source code. And you must show them these terms so they
+know their rights.
+
+ Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+ For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software. For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+ Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so. This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software. The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable. Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products. If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+ Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary. To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+ The precise terms and conditions for copying, distribution and
+modification follow.
+
+ TERMS AND CONDITIONS
+
+ 0. Definitions.
+
+ "This License" refers to version 3 of the GNU General Public License.
+
+ "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+ "The Program" refers to any copyrightable work licensed under this
+License. Each licensee is addressed as "you". "Licensees" and
+"recipients" may be individuals or organizations.
+
+ To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy. The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+ A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+ To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy. Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+ To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies. Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+ An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License. If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+ 1. Source Code.
+
+ The "source code" for a work means the preferred form of the work
+for making modifications to it. "Object code" means any non-source
+form of a work.
+
+ A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+ The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form. A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+ The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities. However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work. For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+ The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+ The Corresponding Source for a work in source code form is that
+same work.
+
+ 2. Basic Permissions.
+
+ All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met. This License explicitly affirms your unlimited
+permission to run the unmodified Program. The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work. This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+ You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force. You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright. Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
+
+ Conveying under any other circumstances is permitted solely under
+the conditions stated below. Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+ 3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+ No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+ When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+ 4. Conveying Verbatim Copies.
+
+ You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+ You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+ 5. Conveying Modified Source Versions.
+
+ You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+ a) The work must carry prominent notices stating that you modified
+ it, and giving a relevant date.
+
+ b) The work must carry prominent notices stating that it is
+ released under this License and any conditions added under section
+ 7. This requirement modifies the requirement in section 4 to
+ "keep intact all notices".
+
+ c) You must license the entire work, as a whole, under this
+ License to anyone who comes into possession of a copy. This
+ License will therefore apply, along with any applicable section 7
+ additional terms, to the whole of the work, and all its parts,
+ regardless of how they are packaged. This License gives no
+ permission to license the work in any other way, but it does not
+ invalidate such permission if you have separately received it.
+
+ d) If the work has interactive user interfaces, each must display
+ Appropriate Legal Notices; however, if the Program has interactive
+ interfaces that do not display Appropriate Legal Notices, your
+ work need not make them do so.
+
+ A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit. Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+ 6. Conveying Non-Source Forms.
+
+ You may convey a covered work in object code form under the terms
+of sections 4 and 5, provided that you also convey the
+machine-readable Corresponding Source under the terms of this License,
+in one of these ways:
+
+ a) Convey the object code in, or embodied in, a physical product
+ (including a physical distribution medium), accompanied by the
+ Corresponding Source fixed on a durable physical medium
+ customarily used for software interchange.
+
+ b) Convey the object code in, or embodied in, a physical product
+ (including a physical distribution medium), accompanied by a
+ written offer, valid for at least three years and valid for as
+ long as you offer spare parts or customer support for that product
+ model, to give anyone who possesses the object code either (1) a
+ copy of the Corresponding Source for all the software in the
+ product that is covered by this License, on a durable physical
+ medium customarily used for software interchange, for a price no
+ more than your reasonable cost of physically performing this
+ conveying of source, or (2) access to copy the
+ Corresponding Source from a network server at no charge.
+
+ c) Convey individual copies of the object code with a copy of the
+ written offer to provide the Corresponding Source. This
+ alternative is allowed only occasionally and noncommercially, and
+ only if you received the object code with such an offer, in accord
+ with subsection 6b.
+
+ d) Convey the object code by offering access from a designated
+ place (gratis or for a charge), and offer equivalent access to the
+ Corresponding Source in the same way through the same place at no
+ further charge. You need not require recipients to copy the
+ Corresponding Source along with the object code. If the place to
+ copy the object code is a network server, the Corresponding Source
+ may be on a different server (operated by you or a third party)
+ that supports equivalent copying facilities, provided you maintain
+ clear directions next to the object code saying where to find the
+ Corresponding Source. Regardless of what server hosts the
+ Corresponding Source, you remain obligated to ensure that it is
+ available for as long as needed to satisfy these requirements.
+
+ e) Convey the object code using peer-to-peer transmission, provided
+ you inform other peers where the object code and Corresponding
+ Source of the work are being offered to the general public at no
+ charge under subsection 6d.
+
+ A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+ A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal, family,
+or household purposes, or (2) anything designed or sold for incorporation
+into a dwelling. In determining whether a product is a consumer product,
+doubtful cases shall be resolved in favor of coverage. For a particular
+product received by a particular user, "normally used" refers to a
+typical or common use of that class of product, regardless of the status
+of the particular user or of the way in which the particular user
+actually uses, or expects or is expected to use, the product. A product
+is a consumer product regardless of whether the product has substantial
+commercial, industrial or non-consumer uses, unless such uses represent
+the only significant mode of use of the product.
+
+ "Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to install
+and execute modified versions of a covered work in that User Product from
+a modified version of its Corresponding Source. The information must
+suffice to ensure that the continued functioning of the modified object
+code is in no case prevented or interfered with solely because
+modification has been made.
+
+ If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information. But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+ The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or updates
+for a work that has been modified or installed by the recipient, or for
+the User Product in which it has been modified or installed. Access to a
+network may be denied when the modification itself materially and
+adversely affects the operation of the network or violates the rules and
+protocols for communication across the network.
+
+ Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+ 7. Additional Terms.
+
+ "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law. If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+ When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it. (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.) You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+ Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+ a) Disclaiming warranty or limiting liability differently from the
+ terms of sections 15 and 16 of this License; or
+
+ b) Requiring preservation of specified reasonable legal notices or
+ author attributions in that material or in the Appropriate Legal
+ Notices displayed by works containing it; or
+
+ c) Prohibiting misrepresentation of the origin of that material, or
+ requiring that modified versions of such material be marked in
+ reasonable ways as different from the original version; or
+
+ d) Limiting the use for publicity purposes of names of licensors or
+ authors of the material; or
+
+ e) Declining to grant rights under trademark law for use of some
+ trade names, trademarks, or service marks; or
+
+ f) Requiring indemnification of licensors and authors of that
+ material by anyone who conveys the material (or modified versions of
+ it) with contractual assumptions of liability to the recipient, for
+ any liability that these contractual assumptions directly impose on
+ those licensors and authors.
+
+ All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10. If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term. If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+ If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+ Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+ 8. Termination.
+
+ You may not propagate or modify a covered work except as expressly
+provided under this License. Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+ However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+ Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+ Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License. If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+ 9. Acceptance Not Required for Having Copies.
+
+ You are not required to accept this License in order to receive or
+run a copy of the Program. Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance. However,
+nothing other than this License grants you permission to propagate or
+modify any covered work. These actions infringe copyright if you do
+not accept this License. Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+ 10. Automatic Licensing of Downstream Recipients.
+
+ Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License. You are not responsible
+for enforcing compliance by third parties with this License.
+
+ An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations. If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+ You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License. For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+ 11. Patents.
+
+ A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based. The
+work thus licensed is called the contributor's "contributor version".
+
+ A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version. For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+ Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+ In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement). To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+ If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients. "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+ If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+ A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License. You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+ Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+ 12. No Surrender of Others' Freedom.
+
+ If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all. For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+ 13. Use with the GNU Affero General Public License.
+
+ Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work. The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+ 14. Revised Versions of this License.
+
+ The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+ Each version is given a distinguishing version number. If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation. If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+ If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+ Later license versions may give you additional or different
+permissions. However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+ 15. Disclaimer of Warranty.
+
+ THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+ 16. Limitation of Liability.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/src/10deg b/src/10deg
new file mode 100644
index 0000000..d054a4c
--- /dev/null
+++ b/src/10deg
@@ -0,0 +1,391 @@
+0.6472 0.3506
+0.6348 0.3612
+0.6225 0.3710
+0.6104 0.3797
+0.5983 0.3874
+0.5864 0.3940
+0.5747 0.3996
+0.5632 0.4041
+0.5519 0.4077
+0.5408 0.4104
+0.5300 0.4123
+0.5195 0.4134
+0.5093 0.4139
+0.4995 0.4138
+0.4900 0.4132
+0.4808 0.4122
+0.4720 0.4108
+0.4636 0.4091
+0.4555 0.4071
+0.4478 0.4050
+0.4404 0.4026
+0.4333 0.4002
+0.4266 0.3976
+0.4202 0.3950
+0.4140 0.3923
+0.4082 0.3895
+0.4026 0.3868
+0.3973 0.3841
+0.3922 0.3813
+0.3873 0.3786
+0.3827 0.3759
+0.3783 0.3733
+0.3741 0.3707
+0.3701 0.3681
+0.3662 0.3656
+0.3625 0.3631
+0.3590 0.3607
+0.3557 0.3583
+0.3524 0.3560
+0.3494 0.3538
+0.3464 0.3516
+0.3436 0.3494
+0.3409 0.3473
+0.3383 0.3453
+0.3358 0.3433
+0.3334 0.3413
+0.3311 0.3394
+0.3289 0.3376
+0.3268 0.3358
+0.3247 0.3341
+0.3228 0.3324
+0.3209 0.3307
+0.3190 0.3291
+0.3173 0.3275
+0.3156 0.3260
+0.3140 0.3245
+0.3124 0.3231
+0.3109 0.3217
+0.3094 0.3203
+0.3080 0.3190
+0.3066 0.3177
+0.3053 0.3164
+0.3040 0.3152
+0.3028 0.3140
+0.3016 0.3128
+0.3004 0.3117
+0.2993 0.3106
+0.2982 0.3095
+0.2971 0.3084
+0.2961 0.3074
+0.2951 0.3064
+0.2942 0.3054
+0.2932 0.3044
+0.2923 0.3035
+0.2914 0.3026
+0.2906 0.3017
+0.2897 0.3008
+0.2889 0.3000
+0.2881 0.2992
+0.2874 0.2983
+0.2866 0.2976
+0.2859 0.2968
+0.2852 0.2960
+0.2845 0.2953
+0.2839 0.2946
+0.2832 0.2939
+0.2826 0.2932
+0.2820 0.2925
+0.2813 0.2918
+0.2808 0.2912
+0.2802 0.2905
+0.2796 0.2899
+0.2791 0.2893
+0.2785 0.2887
+0.2780 0.2881
+0.2775 0.2876
+0.2770 0.2870
+0.2765 0.2865
+0.2761 0.2859
+0.2756 0.2854
+0.2751 0.2849
+0.2747 0.2844
+0.2743 0.2839
+0.2738 0.2834
+0.2734 0.2829
+0.2730 0.2825
+0.2726 0.2820
+0.2722 0.2816
+0.2719 0.2811
+0.2715 0.2807
+0.2711 0.2803
+0.2708 0.2799
+0.2704 0.2794
+0.2701 0.2790
+0.2697 0.2786
+0.2694 0.2783
+0.2691 0.2779
+0.2688 0.2775
+0.2684 0.2771
+0.2681 0.2768
+0.2678 0.2764
+0.2675 0.2761
+0.2673 0.2757
+0.2670 0.2754
+0.2667 0.2751
+0.2664 0.2747
+0.2662 0.2744
+0.2659 0.2741
+0.2656 0.2738
+0.2654 0.2735
+0.2651 0.2732
+0.2649 0.2729
+0.2646 0.2726
+0.2644 0.2723
+0.2642 0.2720
+0.2639 0.2718
+0.2637 0.2715
+0.2635 0.2712
+0.2633 0.2709
+0.2631 0.2707
+0.2629 0.2704
+0.2626 0.2702
+0.2624 0.2699
+0.2622 0.2697
+0.2620 0.2694
+0.2618 0.2692
+0.2617 0.2690
+0.2615 0.2687
+0.2613 0.2685
+0.2611 0.2683
+0.2609 0.2681
+0.2607 0.2678
+0.2606 0.2676
+0.2604 0.2674
+0.2602 0.2672
+0.2601 0.2670
+0.2599 0.2668
+0.2597 0.2666
+0.2596 0.2664
+0.2594 0.2662
+0.2593 0.2660
+0.2591 0.2658
+0.2590 0.2656
+0.2588 0.2654
+0.2587 0.2653
+0.2585 0.2651
+0.2584 0.2649
+0.2582 0.2647
+0.2581 0.2645
+0.2580 0.2644
+0.2578 0.2642
+0.2577 0.2640
+0.2575 0.2639
+0.2574 0.2637
+0.2573 0.2635
+0.2572 0.2634
+0.2570 0.2632
+0.2569 0.2631
+0.2568 0.2629
+0.2567 0.2628
+0.2566 0.2626
+0.2564 0.2625
+0.2563 0.2623
+0.2562 0.2622
+0.2561 0.2620
+0.2560 0.2619
+0.2559 0.2618
+0.2558 0.2616
+0.2557 0.2615
+0.2555 0.2613
+0.2554 0.2612
+0.2553 0.2611
+0.2552 0.2609
+0.2551 0.2608
+0.2550 0.2607
+0.2549 0.2606
+0.2548 0.2604
+0.2547 0.2603
+0.2546 0.2602
+0.2546 0.2601
+0.2545 0.2600
+0.2544 0.2598
+0.2543 0.2597
+0.2542 0.2596
+0.2541 0.2595
+0.2540 0.2594
+0.2539 0.2593
+0.2538 0.2591
+0.2537 0.2590
+0.2537 0.2589
+0.2536 0.2588
+0.2535 0.2587
+0.2534 0.2586
+0.2533 0.2585
+0.2533 0.2584
+0.2532 0.2583
+0.2531 0.2582
+0.2530 0.2581
+0.2529 0.2580
+0.2529 0.2579
+0.2528 0.2578
+0.2527 0.2577
+0.2526 0.2576
+0.2526 0.2575
+0.2525 0.2574
+0.2524 0.2573
+0.2524 0.2572
+0.2523 0.2572
+0.2522 0.2571
+0.2521 0.2570
+0.2521 0.2569
+0.2520 0.2568
+0.2519 0.2567
+0.2519 0.2566
+0.2518 0.2565
+0.2517 0.2565
+0.2517 0.2564
+0.2516 0.2563
+0.2516 0.2562
+0.2515 0.2561
+0.2514 0.2560
+0.2514 0.2560
+0.2513 0.2559
+0.2512 0.2558
+0.2512 0.2557
+0.2511 0.2557
+0.2511 0.2556
+0.2510 0.2555
+0.2510 0.2554
+0.2509 0.2554
+0.2508 0.2553
+0.2508 0.2552
+0.2507 0.2551
+0.2507 0.2551
+0.2506 0.2550
+0.2506 0.2549
+0.2505 0.2548
+0.2505 0.2548
+0.2504 0.2547
+0.2503 0.2546
+0.2503 0.2546
+0.2502 0.2545
+0.2502 0.2544
+0.2501 0.2544
+0.2501 0.2543
+0.2500 0.2542
+0.2500 0.2542
+0.2499 0.2541
+0.2499 0.2541
+0.2499 0.2540
+0.2498 0.2539
+0.2498 0.2539
+0.2497 0.2538
+0.2497 0.2537
+0.2496 0.2537
+0.2496 0.2536
+0.2495 0.2536
+0.2495 0.2535
+0.2494 0.2534
+0.2494 0.2534
+0.2493 0.2533
+0.2493 0.2533
+0.2493 0.2532
+0.2492 0.2532
+0.2492 0.2531
+0.2491 0.2530
+0.2491 0.2530
+0.2490 0.2529
+0.2490 0.2529
+0.2490 0.2528
+0.2489 0.2528
+0.2489 0.2527
+0.2488 0.2527
+0.2488 0.2526
+0.2488 0.2526
+0.2487 0.2525
+0.2487 0.2525
+0.2487 0.2524
+0.2486 0.2524
+0.2486 0.2523
+0.2485 0.2523
+0.2485 0.2522
+0.2485 0.2522
+0.2484 0.2521
+0.2484 0.2521
+0.2484 0.2520
+0.2483 0.2520
+0.2483 0.2519
+0.2482 0.2519
+0.2482 0.2518
+0.2482 0.2518
+0.2481 0.2517
+0.2481 0.2517
+0.2481 0.2516
+0.2480 0.2516
+0.2480 0.2516
+0.2480 0.2515
+0.2479 0.2515
+0.2479 0.2514
+0.2479 0.2514
+0.2478 0.2513
+0.2478 0.2513
+0.2478 0.2513
+0.2477 0.2512
+0.2477 0.2512
+0.2477 0.2511
+0.2476 0.2511
+0.2476 0.2510
+0.2476 0.2510
+0.2476 0.2510
+0.2475 0.2509
+0.2475 0.2509
+0.2475 0.2508
+0.2474 0.2508
+0.2474 0.2508
+0.2474 0.2507
+0.2473 0.2507
+0.2473 0.2506
+0.2473 0.2506
+0.2473 0.2506
+0.2472 0.2505
+0.2472 0.2505
+0.2472 0.2505
+0.2471 0.2504
+0.2471 0.2504
+0.2471 0.2503
+0.2471 0.2503
+0.2470 0.2503
+0.2470 0.2502
+0.2470 0.2502
+0.2470 0.2502
+0.2469 0.2501
+0.2469 0.2501
+0.2469 0.2501
+0.2468 0.2500
+0.2468 0.2500
+0.2468 0.2500
+0.2468 0.2499
+0.2467 0.2499
+0.2467 0.2498
+0.2467 0.2498
+0.2467 0.2498
+0.2466 0.2497
+0.2466 0.2497
+0.2466 0.2497
+0.2466 0.2497
+0.2465 0.2496
+0.2465 0.2496
+0.2465 0.2496
+0.2465 0.2495
+0.2465 0.2495
+0.2464 0.2495
+0.2464 0.2494
+0.2464 0.2494
+0.2464 0.2494
+0.2463 0.2493
+0.2463 0.2493
+0.2463 0.2493
+0.2463 0.2492
+0.2462 0.2492
+0.2462 0.2492
+0.2462 0.2492
+0.2462 0.2491
+0.2462 0.2491
+0.2461 0.2491
+0.2461 0.2490
+0.2461 0.2490
+0.2461 0.2490
+0.2460 0.2490
+0.2460 0.2489
+0.2460 0.2489
diff --git a/src/blackbody.c b/src/blackbody.c
new file mode 100644
index 0000000..abe03a9
--- /dev/null
+++ b/src/blackbody.c
@@ -0,0 +1,130 @@
+/**
+ * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "blackbody.h"
+#include "macros.h"
+#include <math.h>
+#include <errno.h>
+
+
+
+/**
+ * Convert from CIE xyY to [0, 1] sRGB.
+ *
+ * @param x The 'x' component.
+ * @param y The 'y' component.
+ * @param Y The 'Y' component.
+ * @param r Output parameter for the “red” value.
+ * (Seriously, sRGB red is orange, just look at it fullscreen.)
+ * @param g Output parameter for the green value.
+ * @param b Output parameter for the blue value.
+ */
+static void
+ciexyy_to_srgb(double x, double y, double Y, double *r, double *g, double *b)
+{
+#define SRGB(C) (((C) <= 0.0031308) ? (12.92 * (C)) : ((1.0 + 0.055) * pow((C), 1.0 / 2.4) - 0.055))
+ double X, Z;
+
+ /* Convert CIE xyY to CIE XYZ. */
+ X = Y * (y == 0.0 ? 0.0 : (x / y));
+ Z = Y * (y == 0.0 ? 0.0 : ((1.0 - x - y) / y));
+
+ /* Convert CIE XYZ to [0, 1] linear RGB. (ciexyz_to_linear) */
+ *r = ( 3.240450 * X) + (-1.537140 * Y) + (-0.4985320 * Z);
+ *g = (-0.969266 * X) + ( 1.876010 * Y) + ( 0.0415561 * Z);
+ *b = (0.0556434 * X) + (-0.204026 * Y) + ( 1.0572300 * Z);
+
+ /* Convert [0, 1] linear RGB to [0, 1] sRGB. */
+ SRGB(*r), SRGB(*g), SRGB(*b);
+}
+
+
+/**
+ * Perform linear interpolation (considered very good)
+ * between the CIE xyY values for two colour temperatures
+ * and convert the result to sRGB. The two colours should
+ * be the closest below the desired colour temperature,
+ * and the closest above the desired colour temperature.
+ *
+ * @param x1 The 'x' component for the low colour.
+ * @param y1 The 'y' component for the low colour.
+ * @param x2 The 'x' component for the high colour.
+ * @param y2 The 'y' component for the high colour.
+ * @param temp The desired colour temperature.
+ * @param r Output parameter for the “red” value.
+ * @param g Output parameter for the green value.
+ * @param b Output parameter for the blue value.
+ */
+static void
+interpolate(double x1, double y1, double x2, double y2, double temp, double *r, double *g, double *b)
+{
+ double weight = fmod(temp, (double)DELTA_TEMPERATURE) / (double)DELTA_TEMPERATURE;
+ double x = x1 * (1 - weight) + x2 * weight;
+ double y = y1 * (1 - weight) + y2 * weight;
+ ciexyy_to_srgb(x, y, 1.0, r, g, b);
+}
+
+
+/**
+ * Get the [0, 1] sRGB values of a colour temperature.
+ *
+ * @param fd File descriptor for the colour table.
+ * @param temp The desired colour temperature.
+ * @param r Output parameter for the “red” value.
+ * @param g Output parameter for the green value.
+ * @param b Output parameter for the blue value.
+ * @return 0 on succeess, -1 on error.
+ *
+ * @throws 0 The file did not have the expected size.
+ * @throws EDOM The selected temperature is below 1000 K.
+ */
+int
+get_colour(int fd, long int temp, double *r, double *g, double *b)
+{
+ double values[10]; /* low:x,y,r,g,b + high:x,y,r,g,b */
+ off_t offset;
+ double max;
+
+ /* We do not have any values for above 40 000 K, but
+ * the differences will be unnoticeable, perhaps even
+ * unencodeable. */
+ if (temp > HIGHEST_TEMPERATURE) temp = HIGHEST_TEMPERATURE;
+ /* Things do not glow below 1000 K. Yes, fire is hot! */
+ if (temp < LOWEST_TEMPERATURE) t ((errno = EDOM));
+
+ /* Read table. */
+ offset = ((off_t)temp - LOWEST_TEMPERATURE) / DELTA_TEMPERATURE;
+ offset *= (off_t)(sizeof(values) / 2);
+ errno = 0; xpread(fd, values, sizeof(values), offset);
+
+ /* Get colour. */
+ if (temp % DELTA_TEMPERATURE)
+ interpolate(values[0], values[1], values[6], values[7], (double)temp, r, g, b);
+ else
+ *r = values[2], *g = values[3], *b = values[4];
+
+ /* Adjust colours for use. */
+ max = fmax(fmax(fabs(*r), fabs(*g)), fabs(*b));
+ if (max != 0) *r /= max, *g /= max, *b /= max;
+ *r = *r > 0.0 ? *r : 0.0;
+ *g = *g > 0.0 ? *g : 0.0;
+ *b = *b > 0.0 ? *b : 0.0;
+
+ return 0;
+fail:
+ return -1;
+}
+
diff --git a/src/blackbody.h b/src/blackbody.h
new file mode 100644
index 0000000..499e9b8
--- /dev/null
+++ b/src/blackbody.h
@@ -0,0 +1,51 @@
+/**
+ * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+
+/**
+ * The highest colour temperature in the table.
+ */
+#define LIBRED_HIGHEST_TEMPERATURE 40000
+
+/**
+ * The lowest colour temperature in the table.
+ */
+#define LIBRED_LOWEST_TEMPERATURE 1000
+
+/**
+ * The temperature difference between the colours in the table.
+ */
+#define LIBRED_DELTA_TEMPERATURE 100
+
+
+
+/**
+ * Get the [0, 1] sRGB values of a colour temperature.
+ *
+ * @param fd File descriptor for the colour table.
+ * @param temp The desired colour temperature.
+ * @param r Output parameter for the “red” value.
+ * @param g Output parameter for the green value.
+ * @param b Output parameter for the blue value.
+ * @return 0 on succeess, -1 on error.
+ *
+ * @throws 0 The file did not have the expected size.
+ * @throws EDOM The selected temperature is below 1000 K.
+ */
+int libred_get_colour(int fd, long int temp, double *r, double *g, double *b);
+
diff --git a/src/parse_10deg.c b/src/parse_10deg.c
new file mode 100644
index 0000000..ef1c3d5
--- /dev/null
+++ b/src/parse_10deg.c
@@ -0,0 +1,96 @@
+/**
+ * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "blackbody.h"
+#include "macros.h"
+#include <sys/stat.h>
+
+
+
+/**
+ * The number of measured temperatures.
+ */
+#define TEMPERATURES ((LIBRED_HIGHEST_TEMPERATURE - LIBRED_LOWEST_TEMPERATURE) / LIBRED_DELTA_TEMPERATURE + 1)
+
+
+
+/**
+ * Convert from CIE xyY to [0, 1] sRGB.
+ *
+ * This function is identical to that in 'blackbody.c'.
+ *
+ * @param x The 'x' component.
+ * @param y The 'y' component.
+ * @param Y The 'Y' component.
+ * @param r Output parameter for the “red” value.
+ * (Seriously, sRGB red is orange, just look at it fullscreen.)
+ * @param g Output parameter for the green value.
+ * @param b Output parameter for the blue value.
+ */
+static void ciexyy_to_srgb(double x, double y, double Y, double *r, double *g, double *b)
+{
+#define SRGB(C) (((C) <= 0.0031308) ? (12.92 * (C)) : ((1.0 + 0.055) * pow((C), 1.0 / 2.4) - 0.055))
+ double X, Z;
+
+ /* Convert CIE xyY to CIE XYZ. */
+ X = Y * (y == 0.0 ? 0.0 : (x / y));
+ Z = Y * (y == 0.0 ? 0.0 : ((1.0 - x - y) / y));
+
+ /* Convert CIE XYZ to [0, 1] linear RGB. (ciexyz_to_linear) */
+ *r = ( 3.240450 * X) + (-1.537140 * Y) + (-0.4985320 * Z);
+ *g = (-0.969266 * X) + ( 1.876010 * Y) + ( 0.0415561 * Z);
+ *b = (0.0556434 * X) + (-0.204026 * Y) + ( 1.0572300 * Z);
+
+ /* Convert [0, 1] linear RGB to [0, 1] sRGB. */
+ SRGB(*r), SRGB(*g), SRGB(*b);
+}
+
+
+/**
+ * Create the lookup table of temperatures.
+ *
+ * Standard input should be the file '10deg',
+ * standard output should be the table file
+ * and must be a regular file.
+ *
+ * @param argc Should be 1.
+ * @param argv Should only contain the name of the process.
+ * @return 0 on success, 1 on error.
+ */
+int main(int argc, char *argv[])
+{
+#define x (xyrgb[0])
+#define y (xyrgb[1])
+#define r (xyrgb[2])
+#define g (xyrgb[3])
+#define b (xyrgb[4])
+
+ double xyrgb[5];
+ struct stat attr;
+ long int temp = LIBRED_LOWEST_TEMPERATURE;
+
+ for (; fscanf(stdin, "%lf %lf\n", &x, &y) == 2; temp += LIBRED_DELTA_TEMPERATURE)
+ {
+ (temp == 6500) ? (r = g = b = 1.0) : ciexyy_to_srgb(x, y, 1.0, &r, &g, &b);
+ xwrite(STDOUT_FILENO, xyrgb, sizeof(xyrgb));
+ }
+ xwrite(STDOUT_FILENO, xyrgb, sizeof(xyrgb)); /* sugar */
+ t (fstat(STDOUT_FILENO, &attr));
+ return ((size_t)(attr.st_size) != (TEMPERATURES + 1) * 5 * sizeof(double));
+ fail:
+ return perror(argc ? *argv : "parse_10deg"), 1;
+}
+
diff --git a/src/solar.c b/src/solar.c
new file mode 100644
index 0000000..8a57507
--- /dev/null
+++ b/src/solar.c
@@ -0,0 +1,312 @@
+/**
+ * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <math.h>
+#include <time.h>
+#include <errno.h>
+
+
+
+#if !defined(CLOCK_REALTIME_COARSE)
+# define CLOCK_REALTIME_COARSE CLOCK_REALTIME
+#endif
+
+
+
+/**
+ * Get current Julian Centuries time (100 Julian days since J2000.)
+ *
+ * @return The current Julian Centuries time.
+ *
+ * @throws 0 On success.
+ * @throws Any error specified for clock_gettime(3) on error.
+ */
+static double
+julian_centuries()
+{
+ struct timespec now;
+ double tm;
+ if (clock_gettime(CLOCK_REALTIME_COARSE, &now)) return 0.0;
+ tm = (double)(now.tv_nsec) / 1000000000.0 + (double)(now.tv_sec);
+ tm = (tm / 86400.0 + 2440587.5 - 2451545.0) / 36525.0;
+ return errno = 0, tm;
+}
+
+/**
+ * Convert a Julian Centuries timestamp to a Julian Day timestamp.
+ *
+ * @param tm The time in Julian Centuries
+ * @return The time in Julian Days
+ */
+static inline double
+julian_centuries_to_julian_day(double tm)
+{
+ return tm * 36525.0 + 2451545.0;
+}
+
+
+/**
+ * Convert an angle (or otherwise) from degrees to radians.
+ *
+ * @param deg The angle in degrees.
+ * @param The angle in radians.
+ */
+static inline double
+radians(double deg)
+{
+ return deg * (double)M_PI / 180.0;
+}
+
+/**
+ * Convert an angle (or otherwise) from radians to degrees.
+ *
+ * @param rad The angle in radians.
+ * @param The angle in degrees.
+ */
+static inline double
+degrees(double rad)
+{
+ return rad * 180.0 / (double)M_PI;
+}
+
+
+/**
+ * Calculates the Sun's elevation from the solar hour angle
+ *
+ * @param longitude The longitude in degrees eastwards.
+ * from Greenwich, negative for westwards.
+ * @param declination The declination, in radians.
+ * @param hour_angle The solar hour angle, in radians.
+ * @return The Sun's elevation, in radians.
+ */
+static inline double
+elevation_from_hour_angle(double latitude, double declination, double hour_angle)
+{
+ double rc = cos(radians(latitude));
+ rc *= cos(hour_angle) * cos(declination);
+ rc += sin(radians(latitude)) * sin(declination);
+ return asin(rc);
+}
+
+/**
+ * Calculates the Sun's geometric mean longitude.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The Sun's geometric mean longitude in radians.
+ */
+static inline double
+sun_geometric_mean_longitude(double tm)
+{
+ double rc = fmod(pow(0.0003032 * tm, 2.0) + 36000.76983 * tm + 280.46646, 360.0);
+#if defined(TIMETRAVELLER)
+ rc = rc < 0.0 ? (rc + 360.0) : rc;
+#endif
+ return radians(rc);
+}
+
+/**
+ * Calculates the Sun's geometric mean anomaly.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The Sun's geometric mean anomaly in radians.
+ */
+static inline double
+sun_geometric_mean_anomaly(double tm)
+{
+ return radians(pow(-0.0001537 * tm, 2.0) + 35999.05029 * tm + 357.52911);
+}
+
+/**
+ * Calculates the Earth's orbit eccentricity.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The Earth's orbit eccentricity.
+ */
+static inline double
+earth_orbit_eccentricity(double tm)
+{
+ return pow(-0.0000001267 * tm, 2.0) - 0.000042037 * tm + 0.016708634;
+}
+
+/**
+ * Calculates the Sun's equation of the centre, the difference
+ * between the true anomaly and the mean anomaly.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The Sun's equation of the centre, in radians.
+ */
+static inline double
+sun_equation_of_centre(double tm)
+{
+ double a = sun_geometric_mean_anomaly(tm), rc;
+ rc = sin(1.0 * a) * (pow(-0.000014 * tm, 2.0) - 0.004817 * tm + 1.914602);
+ rc += sin(2.0 * a) * (-0.000101 * tm + 0.019993);
+ rc += sin(3.0 * a) * 0.000289;
+ return radians(rc);
+}
+
+/**
+ * Calculates the Sun's real longitudinal position.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The longitude, in radians.
+ */
+static inline double
+sun_real_longitude(double tm)
+{
+ return sun_geometric_mean_longitude(tm) + sun_equation_of_centre(tm);
+}
+
+/**
+ * Calculates the Sun's apparent longitudinal position.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The longitude, in radians.
+ */
+static inline double
+sun_apparent_longitude(double tm)
+{
+ double rc = degrees(sun_real_longitude(tm)) - 0.00569;
+ return radians(rc - 0.00478 * sin(radians(-1934.136 * tm + 125.04)));
+}
+
+/**
+ * Calculates the mean ecliptic obliquity of the Sun's
+ * apparent motion without variation correction.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The uncorrected mean obliquity, in radians.
+ */
+static double
+mean_ecliptic_obliquity(double tm)
+{
+ double rc = pow(0.001813 * tm, 3.0) - pow(0.00059 * tm, 2.0) - 46.815 * tm + 21.448;
+ return radians(23.0 + (26.0 + rc / 60.0) / 60.0);
+}
+
+/**
+ * Calculates the mean ecliptic obliquity of the Sun's
+ * parent motion with variation correction.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The mean obliquity, in radians.
+ */
+static double
+corrected_mean_ecliptic_obliquity(double tm)
+{
+ double rc = 0.00256 * cos(radians(-1934.136 * tm + 125.04));
+ return radians(rc + degrees(mean_ecliptic_obliquity(tm)));
+}
+
+/**
+ * Calculates the Sun's declination.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The Sun's declination, in radian.
+ */
+static inline double
+solar_declination(double tm)
+{
+ double rc = sin(corrected_mean_ecliptic_obliquity(tm));
+ return asin(rc * sin(sun_apparent_longitude(tm)));
+}
+
+/**
+ * Calculates the equation of time, the discrepancy
+ * between apparent and mean solar time.
+ *
+ * @param tm The time in Julian Centuries.
+ * @return The equation of time, in degrees.
+ */
+static inline double
+equation_of_time(double tm)
+{
+ double l = sun_geometric_mean_longitude(tm);
+ double e = earth_orbit_eccentricity(tm);
+ double m = sun_geometric_mean_anomaly(tm);
+ double y = pow(tan(corrected_mean_ecliptic_obliquity(tm) / 2.0), 2.0);
+ double rc = y * sin(2.0 * l);
+ rc += (4.0 * y * cos(2.0 * l) - 2.0) * e * sin(m);
+ rc -= pow(0.5 * y, 2.0) * sin(4.0 * l);
+ rc -= pow(1.25 * e, 2.0) * sin(2.0 * m);
+ return 4.0 * degrees(rc);
+}
+
+/**
+ * Calculates the Sun's elevation as apparent.
+ * from a geographical position.
+ *
+ * @param tm The time in Julian Centuries.
+ * @param latitude The latitude in degrees northwards from
+ * the equator, negative for southwards.
+ * @param longitude The longitude in degrees eastwards from
+ * Greenwich, negative for westwards.
+ * @return The Sun's apparent elevation at the specified time as seen
+ * from the specified position, measured in radians.
+ */
+static inline double
+solar_elevation_from_time(double tm, double latitude, double longitude)
+{
+ double rc = julian_centuries_to_julian_day(tm);
+ rc = (rc - round(rc) - 0.5) * 1440;
+ rc = 720.0 - rc - equation_of_time(tm);
+ rc = radians(rc / 4.0 - longitude);
+ return elevation_from_hour_angle(latitude, solar_declination(tm), rc);
+}
+
+
+/**
+ * Calculates the Sun's elevation as apparent.
+ * from a geographical position.
+ *
+ * @param latitude The latitude in degrees northwards from
+ * the equator, negative for southwards.
+ * @param longitude The longitude in degrees eastwards from
+ * Greenwich, negative for westwards.
+ * @return The Sun's apparent elevation as seen, right now,
+ * from the specified position, measured in degrees.
+ *
+ * @throws 0 On success.
+ * @throws Any error specified for clock_gettime(3) on error.
+ */
+double
+solar_elevation(double latitude, double longitude)
+{
+ double tm = julian_centuries();
+ return errno ? -1 : degrees(solar_elevation_from_time(tm, latitude, longitude));
+}
+
+
+/**
+ * Exit if time the is before year 0 in J2000.
+ *
+ * @return 0 on success, -1 on error.
+ */
+#if defined(TIMETRAVELLER)
+int
+check_timetravel(void)
+{
+ struct timespec now;
+ if (clock_gettime(CLOCK_REALTIME, &now)) return -1;
+ if (now.tv_nsec < (time_t)946728000L)
+ fprintf(stderr, "We have detected that you are a time-traveller"
+ "(or your clock is not configured correctly.)"
+ "Please recompile with -DTIMETRAVELLER"
+ "(or correct your clock.)"), exit(1);
+ return 0;
+}
+#endif
+
diff --git a/src/solar.h b/src/solar.h
new file mode 100644
index 0000000..8e94cf9
--- /dev/null
+++ b/src/solar.h
@@ -0,0 +1,107 @@
+/**
+ * Copyright © 2016 Mattias Andrée <maandree@member.fsf.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+/**
+ * Approximate apparent size of the Sun in degrees.
+ */
+#define LIBRED_SOLAR_APPARENT_RADIUS (32.0 / 60.0)
+
+
+/**
+ * The Sun's elevation at sunset and sunrise, measured in degrees.
+ */
+#define LIBRED_SOLAR_ELEVATION_SUNSET_SUNRISE (0.0)
+
+/**
+ * The Sun's elevation at civil dusk and civil dawn, measured in degrees.
+ */
+#define LIBRED_SOLAR_ELEVATION_CIVIL_DUSK_DAWN (-6.0)
+
+/**
+ * The Sun's elevation at nautical dusk and nautical dawn, measured in degrees.
+ */
+#define LIBRED_SOLAR_ELEVATION_NAUTICAL_DUSK_DAWN (-12.0)
+
+/**
+ * The Sun's elevation at astronomical dusk and astronomical dawn, measured in degrees.
+ */
+#define LIBRED_SOLAR_ELEVATION_ASTRONOMICAL_DUSK_DAWN (-18.0)
+
+
+/**
+ * Test whether it is twilight.
+ *
+ * @param ELEV:double The current elevation.
+ * @return 1 if is twilight, 0 otherwise.
+ */
+#define LIBRED_IS_TWILIGHT(ELEV) ((-18.0 <= (ELEV)) && ((ELEV) <= 0.0))
+
+/**
+ * Test whether it is civil twilight.
+ *
+ * @param ELEV:double The current elevation.
+ * @return 1 if is civil twilight, 0 otherwise.
+ */
+#define LIBRED_IS_CIVIL_TWILIGHT(ELEV) ((-6.0 <= (ELEV)) && ((ELEV) <= 0.0))
+
+/**
+ * Test whether it is nautical twilight.
+ *
+ * @param ELEV:double The current elevation.
+ * @return 1 if is nautical twilight, 0 otherwise.
+ */
+#define LIBRED_IS_NAUTICAL_TWILIGHT(ELEV) ((-12.0 <= (ELEV)) && ((ELEV) <= -6.0))
+
+/**
+ * Test whether it is astronomical twilight.
+ *
+ * @param ELEV:double The current elevation.
+ * @return 1 if is astronomical twilight, 0 otherwise.
+ */
+#define LIBRED_IS_ASTRONOMICAL_TWILIGHT(ELEV) ((-18.0 <= (ELEV)) && ((ELEV) <= -12.0))
+
+
+
+/**
+ * Calculates the Sun's elevation as apparent.
+ * from a geographical position.
+ *
+ * @param latitude The latitude in degrees northwards from
+ * the equator, negative for southwards.
+ * @param longitude The longitude in degrees eastwards from
+ * Greenwich, negative for westwards.
+ * @return The Sun's apparent elevation as seen, right now,
+ * from the specified position, measured in degrees.
+ *
+ * @throws 0 On success.
+ * @throws Any error specified for clock_gettime(3) on error.
+ */
+double libred_solar_elevation(double latitude, double longitude);
+
+
+/**
+ * Exit if time the is before year 0 in J2000.
+ *
+ * @return 0 on success, -1 on error.
+ */
+#if defined(TIMETRAVELLER)
+int libred_check_timetravel(void);
+#else
+# define libred_check_timetravel() 0
+#endif
+
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-09-19 16:59:13 +0000