$ git clone https://librecgm.ion.nu/librecgm.git
commit 2b198f01bdfdaf8c24489a66c941b5f39902ef75
Author: Alicia <...>
Date: Sat Sep 18 19:27:23 2021 +0200
Initial commit.
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..dba13ed
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,661 @@
+ GNU AFFERO GENERAL PUBLIC LICENSE
+ Version 3, 19 November 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 Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+ The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works. By contrast,
+our General Public Licenses are 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.
+
+ 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.
+
+ Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+ A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate. Many developers of free software are heartened and
+encouraged by the resulting cooperation. However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+ The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community. It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server. Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+ An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals. This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing under
+this license.
+
+ 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 Affero 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. Remote Network Interaction; Use with the GNU General Public License.
+
+ Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
+interacting with it remotely through a computer network (if your version
+supports such interaction) an opportunity to receive the Corresponding
+Source of your version by providing access to the Corresponding Source
+from a network server at no charge, through some standard or customary
+means of facilitating copying of software. This Corresponding Source
+shall include the Corresponding Source for any work covered by version 3
+of the GNU General Public License that is incorporated pursuant to the
+following paragraph.
+
+ 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 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 work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+ 14. Revised Versions of this License.
+
+ The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero 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 Affero 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 Affero 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 Affero 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 Affero 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero 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 your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source. For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code. There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+ 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 AGPL, see
+<http://www.gnu.org/licenses/>.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..be66e6f
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,15 @@
+PREFIX=/usr
+GLADEPATH=$(PREFIX)/share/librecgm/gui.glade
+LIBS=$(shell pkg-config --libs gdk-pixbuf-2.0 libv4l2 gtk+-3.0 freetype2 fontconfig)
+CFLAGS=$(shell pkg-config --cflags gdk-pixbuf-2.0 libv4l2 gtk+-3.0 freetype2 fontconfig) -g3 -Wall -Wextra -DGLADEPATH='"$(GLADEPATH)"'
+OBJ=findrect.o img.o read.o main.o cam.o gui.o data.o
+
+librecgm: $(OBJ)
+ $(CC) $^ $(LIBS) -o $@
+
+install: librecgm gui.glade
+ install -D -m 755 $< $(DESTDIR)$(PREFIX)/bin/$<
+ install -D -m 644 gui.glade $(DESTDIR)$(PREFIX)/share/librecgm/gui.glade
+
+clean:
+ rm -f librecgm $(OBJ)
diff --git a/cam.c b/cam.c
new file mode 100644
index 0000000..144a3ff
--- /dev/null
+++ b/cam.c
@@ -0,0 +1,72 @@
+/*
+ LibreCGM, an optical reader for the Freestyle Libre
+ Copyright (C) 2021 alicia@ion.nu
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <stdlib.h>
+#include <fcntl.h>
+#include <linux/videodev2.h>
+#include <libv4l2.h>
+#include "img.h"
+#include "cam.h"
+
+struct cam* cam_init(const char* dev)
+{
+ struct cam* cam=malloc(sizeof(struct cam));
+ int fd=v4l2_open(dev, O_RDWR);
+ struct v4l2_format fmt;
+ fmt.type=V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ fmt.fmt.pix.width=1024;
+ fmt.fmt.pix.height=768;
+ fmt.fmt.pix.pixelformat=V4L2_PIX_FMT_RGB24;
+ fmt.fmt.pix.field=V4L2_FIELD_NONE;
+ fmt.fmt.pix.bytesperline=fmt.fmt.pix.width*3;
+ fmt.fmt.pix.sizeimage=fmt.fmt.pix.bytesperline*fmt.fmt.pix.height;
+ v4l2_ioctl(fd, VIDIOC_S_FMT, &fmt);
+ v4l2_ioctl(fd, VIDIOC_G_FMT, &fmt);
+ cam->fd=fd;
+ cam->w=fmt.fmt.pix.width;
+ cam->h=fmt.fmt.pix.height;
+ return cam;
+}
+
+void cam_read(struct cam* cam, void* pixels)
+{
+ v4l2_read(cam->fd, pixels, cam->w*cam->h*3);
+}
+
+void cam_free(struct cam* cam)
+{
+ v4l2_close(cam->fd);
+ free(cam);
+}
+
+void cam_grab(struct img* img, const char* dev)
+{
+ struct cam* cam=cam_init(dev);
+ img->w=cam->w;
+ img->h=cam->h;
+ img->rowstride=cam->w*3;
+ img->pixstride=3;
+ img->pixels=malloc(img->h*img->rowstride);
+ // Grab 20 frames to let the camera adjust to screen brightness
+ // Are there better ways to solve this? A simple delay does not
+ int i;
+ for(i=0; i<20; ++i)
+ {
+ cam_read(cam, img->pixels);
+ }
+ cam_free(cam);
+}
diff --git a/cam.h b/cam.h
new file mode 100644
index 0000000..5677d00
--- /dev/null
+++ b/cam.h
@@ -0,0 +1,27 @@
+/*
+ LibreCGM, an optical reader for the Freestyle Libre
+ Copyright (C) 2021 alicia@ion.nu
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+struct cam
+{
+ int fd;
+ int w;
+ int h;
+};
+
+extern struct cam* cam_init(const char* dev);
+extern void cam_read(struct cam* cam, void* pixels);
+extern void cam_free(struct cam* cam);
diff --git a/data.c b/data.c
new file mode 100644
index 0000000..2e5f465
--- /dev/null
+++ b/data.c
@@ -0,0 +1,59 @@
+/*
+ LibreCGM, an optical reader for the Freestyle Libre
+ Copyright (C) 2021 alicia@ion.nu
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "data.h"
+
+int* readdata(const char* path, int* listlen)
+{
+ FILE* f=fopen(path, "r");
+ if(!f){return 0;}
+ int* list=0;//malloc(sizeof(int)*283);
+ int len=0;//32;
+ int i;
+ char line[128];
+ for(i=0;; i++)
+ {
+ if(!fgets(line, 128, f)){break;}
+ if(i>=len)
+ {
+ len+=64;
+ list=realloc(list, sizeof(int)*len);
+ }
+ char* sp=strchr(line, ' ');
+ if(!sp){continue;}
+ list[i]=strtod(&sp[1], 0)*10;
+ }
+ fclose(f);
+ if(listlen){*listlen=i;}
+ return list;
+}
+
+void writedata(FILE* f, int* list, int listlen, const char* unit)
+{
+ int i;
+ for(i=0; i<listlen; ++i)
+ {
+ int m=i*60*24/listlen;
+ int h=m/60;
+ m%=60;
+// fprintf(f, "%02i:%02i: %.1f mmol/L\n", h, m, ((double)list[i])/10);
+ fprintf(f, "%02i:%02i: %.1f %s\n", h, m, ((double)list[i])/10, unit);
+ }
+}
diff --git a/data.h b/data.h
new file mode 100644
index 0000000..4a13a9e
--- /dev/null
+++ b/data.h
@@ -0,0 +1,19 @@
+/*
+ LibreCGM, an optical reader for the Freestyle Libre
+ Copyright (C) 2021 alicia@ion.nu
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+extern int* readdata(const char* path, int* listlen);
+extern void writedata(FILE* f, int* list, int listlen, const char* unit);
diff --git a/findrect.c b/findrect.c
new file mode 100644
index 0000000..a147ee0
--- /dev/null
+++ b/findrect.c
@@ -0,0 +1,172 @@
+/*
+ LibreCGM, an optical reader for the Freestyle Libre
+ Copyright (C) 2021 alicia@ion.nu
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <stdio.h>
+#include <string.h>
+#include "img.h"
+
+static void search3(struct img* img, int* corner, int edge, signed char dir[2])
+{
+//printf("search3(corner: %i x %i, dir: %hhi x %hhi)\n", corner[0], corner[1], dir[0], dir[1]);
+ int startx=((dir[0]>0)?0:img->w-1);
+ int starty=((dir[1]>0)?0:img->h-1);
+ int i;
+ for(i=0; i<img->w && i<img->h; i++)
+ {
+ int d;
+ for(d=-1; d<2; d+=2)
+ {
+ int j;
+// TODO: Calculate a more reasonable endpoint?
+ for(j=0; j<img->w && j<img->h; j++)
+ {
+// TODO: Somehow reverse the order of this so it goes in a straight line instead of two lines out from the same point? It probably doesn't matter though
+ int x=startx+(i+j*d)*dir[0];
+ int y=starty+(i-j*d)*dir[1];
+ if(x<0 || x>=img->w){continue;}
+ if(y<0 || y>=img->h){continue;}
+ unsigned char* p=pixel(img, x, y);
+ int v=p[0]+p[1]+p[2];
+ if(v>edge)
+ {
+ corner[0]=x;
+ corner[1]=y;
+ return;
+ }
+ }
+ }
+ }
+}
+
+static char search(struct img* img, int* corner, int edge, char dir)
+{
+ int x,y;
+ char xinv=0;
+ char yinv=0;
+ switch(dir)
+ {
+ case 2: xinv=1; yinv=1; // fall through
+ case 0:
+ for(y=0; y<img->h; y++)
+ {
+ for(x=0; x<img->w; x++)
+ {
+ unsigned char* p=&img->pixels[
+ (yinv?img->h-1-y:y) *img->rowstride+
+ (xinv?img->w-1-x:x) *img->pixstride];
+ int v=p[0]+p[1]+p[2];
+ if(v>edge)
+ {
+ corner[0]=(xinv?img->w-1-x:x);
+ corner[1]=(yinv?img->h-1-y:y);
+ return 1;
+ }
+ }
+ }
+ break;
+ case 3:
+ case 1:
+ if(dir==1){xinv=1;}else{yinv=1;}
+ for(x=0; x<img->w; x++)
+ {
+ for(y=0; y<img->h; y++)
+ {
+ unsigned char* p=&img->pixels[
+ (yinv?img->h-1-y:y) *img->rowstride+
+ (xinv?img->w-1-x:x) *img->pixstride];
+ int v=p[0]+p[1]+p[2];
+ if(v>edge)
+ {
+ corner[0]=(xinv?img->w-1-x:x);
+ corner[1]=(yinv?img->h-1-y:y);
+ return 1;
+ }
+ }
+ }
+ break;
+ }
+ return 0;
+}
+
+static int triarea(int* rect)
+{
+ int min[2]={rect[0],rect[1]};
+ int max[2]={rect[0],rect[1]};
+ int i;
+ for(i=1; i<3; i++)
+ {
+ if(rect[i*2]<min[0]){min[0]=rect[i*2];}
+ if(rect[i*2]>max[0]){max[0]=rect[i*2];}
+ if(rect[i*2+1]<min[1]){min[1]=rect[i*2+1];}
+ if(rect[i*2+1]>max[1]){max[1]=rect[i*2+1];}
+ }
+ int w=max[0]-min[0];
+ int h=max[1]-min[1];
+ return (w*h)/2;
+}
+
+static int area(int* rect)
+{
+ int tri[6]={rect[4], rect[5],
+ rect[6], rect[7],
+ rect[0], rect[1]};
+ return triarea(rect)+triarea(tri);
+}
+
+int* findrect(struct img* img)
+{
+ static int rect[8];
+ int x,y;
+ int min=255*3, max=0;
+ for(y=0; y<img->h; y++)
+ {
+ for(x=0; x<img->w; x++)
+ {
+ unsigned char* p=&img->pixels[y*img->rowstride+x*img->pixstride];
+ int v=p[0]+p[1]+p[2];
+ if(v<min){min=v;}
+ if(v>max){max=v;}
+ }
+ }
+ int edge=(min*2+max)/3; // Median color value to determine if a pixel hits the screen (except a little lower which gives more accurate results)
+ int i;
+ int drect[8];
+ for(i=0; i<4; i++)
+ {
+ if(!search(img, &rect[i*2], edge, i)){printf("Failed to find corner %i\n", i);}
+ signed char diagonal[]={1-((1-i)&2), 1-((2-i)&2)};
+ search3(img, &drect[i*2], edge, diagonal);
+ }
+/*
+printf("Diagonal rectangle: (area: %i)\n", area(drect));
+for(i=0; i<4; i++)
+{
+ printf(" %i x %i\n", drect[i*2], drect[i*2+1]);
+}
+printf("Plain rectangle: (area: %i)\n", area(rect));
+for(i=0; i<4; i++)
+{
+ printf(" %i x %i\n", rect[i*2], rect[i*2+1]);
+}
+*/
+ if(area(drect)>area(rect))
+ {
+// printf("Going with diagonal\n");
+ memcpy(rect, drect, sizeof(int)*8);
+ }
+ return rect;
+}
diff --git a/gui.c b/gui.c
new file mode 100644
index 0000000..7c9a398
--- /dev/null
+++ b/gui.c
@@ -0,0 +1,261 @@
+/*
+ LibreCGM, an optical reader for the Freestyle Libre
+ Copyright (C) 2021 alicia@ion.nu
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <stdio.h>
+#include <gtk/gtk.h>
+#include "cam.h"
+#include "img.h"
+#include "data.h"
+extern int* readgraph(struct img* img, int* rect, int max);
+extern int* findrect(struct img* img);
+
+static GtkImage* display=0;
+static GtkWidget* scroll=0;
+static GtkWidget* window=0;
+static char doscan=0;
+static struct cam* cam=0;
+static const char* currentcam=0;
+static int* list=0;
+static int unit;
+
+static int updatecam(int** onlygrab)
+{
+ static GdkPixbuf* pb=0;
+ static void* pixels;
+ if(cam)
+ {
+ if(!pb || gdk_pixbuf_get_width(pb)!=cam->w || gdk_pixbuf_get_height(pb)!=cam->h)
+ {
+ if(pb){g_object_unref(pb);}
+ pb=gdk_pixbuf_new(GDK_COLORSPACE_RGB, 0, 8, cam->w, cam->h);
+ pixels=gdk_pixbuf_get_pixels(pb);
+ }
+ cam_read(cam, pixels);
+ }
+ struct img img;
+ img.pixels=pixels;
+ img.w=gdk_pixbuf_get_width(pb);
+ img.h=gdk_pixbuf_get_height(pb);
+ img.rowstride=gdk_pixbuf_get_rowstride(pb);
+ img.pixstride=gdk_pixbuf_get_n_channels(pb);
+ GdkPixbuf* img_=gtk_image_get_pixbuf(display);
+ static int* rect=0; // Reuse rect to keep our preview from interfering
+ if(doscan)
+ {
+ if(cam)
+ {
+ cam_free(cam);
+ cam=0;
+ }
+ if(!list){list=readgraph(&img, rect, unit*10);}
+ if(onlygrab)
+ {
+ *onlygrab=list;
+ gtk_main_quit();
+ return 0;
+ }
+ img.pixels=gdk_pixbuf_get_pixels(img_);
+ img.w=gdk_pixbuf_get_width(img_);
+ img.h=gdk_pixbuf_get_height(img_);
+ img.rowstride=gdk_pixbuf_get_rowstride(img_);
+ img.pixstride=gdk_pixbuf_get_n_channels(img_);
+ memset(img.pixels, 255, img.h*img.rowstride); // Clear to white
+ drawgraph(&img, /*210*/unit*10, 283, list);
+ gtk_image_set_from_pixbuf(display, img_);
+ return 0;
+ }
+ rect=findrect(&img);
+ int i;
+ for(i=0; i<4; i++) // Visualize what's detected
+ {
+ drawline(&img, &rect[i*2], &rect[((i+1)%4)*2], 0xff0000);
+ }
+ // Scale to fit the window
+ int w=gtk_widget_get_allocated_width(scroll);
+ int h=gtk_widget_get_allocated_height(scroll);
+ if(w>h*cam->w/cam->h) // Maintain aspect ratio
+ {
+ w=h*cam->w/cam->h;
+ }else{
+ h=w*cam->h/cam->w;
+ }
+ if(!img_ || gdk_pixbuf_get_width(img_)!=w || gdk_pixbuf_get_height(img_)!=h)
+ {
+ GdkPixbuf* old=img_;
+ img_=gdk_pixbuf_scale_simple(pb, w, h, GDK_INTERP_BILINEAR);
+ gtk_image_set_from_pixbuf(GTK_IMAGE(display), img_);
+ if(old){g_object_unref(old);}
+ }else{
+ double scalex=(double)w/(double)cam->w;
+ double scaley=(double)h/(double)cam->h;
+ gdk_pixbuf_scale(pb, img_, 0, 0, w, h, 0, 0, scalex, scaley, GDK_INTERP_BILINEAR);
+ gtk_image_set_from_pixbuf(GTK_IMAGE(display), img_);
+ }
+ return 1;
+}
+
+static void gui_scan(GtkButton* btn, void* ptr __attribute__((unused)))
+{
+ if(doscan) // Return to cam
+ {
+ doscan=0;
+ cam=cam_init(currentcam);
+ g_timeout_add(1000/10, G_SOURCE_FUNC(updatecam), 0);
+ gtk_button_set_label(btn, "Scan graph");
+ }else{
+ free(list);
+ list=0;
+ doscan=1;
+ gtk_button_set_label(btn, "Rescan");
+ }
+}
+
+static void filefilters(GtkFileChooser* chooser, char open)
+{
+ GtkFileFilter* filter=gtk_file_filter_new();
+ gtk_file_filter_add_pattern(filter, "*.bsv");
+ if(open)
+ {
+ gtk_file_filter_set_name(filter, "Readable files");
+ }else{
+ gtk_file_filter_set_name(filter, "Blood sugar values");
+ gtk_file_chooser_add_filter(chooser, filter);
+ filter=gtk_file_filter_new();
+ gtk_file_filter_set_name(filter, "Graph");
+ }
+ gtk_file_filter_add_pixbuf_formats(filter);
+ gtk_file_chooser_add_filter(chooser, filter);
+}
+
+static void gui_load(GtkButton* btn)
+{
+ GtkFileChooserNative* chooser=gtk_file_chooser_native_new("Open file", GTK_WINDOW(window), GTK_FILE_CHOOSER_ACTION_OPEN, "_Open", "_Cancel");
+ filefilters(GTK_FILE_CHOOSER(chooser), 1);
+ if(gtk_native_dialog_run(GTK_NATIVE_DIALOG(chooser))!=GTK_RESPONSE_ACCEPT){return;}
+ char* path=gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(chooser));
+ if(!path){return;}
+
+ GdkPixbuf* img_; // Try opening as image file first
+ if((img_=gdk_pixbuf_new_from_file(path, 0)))
+ {
+ struct img img;
+ img.pixels=gdk_pixbuf_get_pixels(img_);
+ img.w=gdk_pixbuf_get_width(img_);
+ img.h=gdk_pixbuf_get_height(img_);
+ img.rowstride=gdk_pixbuf_get_rowstride(img_);
+ img.pixstride=gdk_pixbuf_get_n_channels(img_);
+ free(list);
+ list=readgraph(&img, 0, unit*10);
+ g_object_unref(img_);
+ }else{
+ free(list);
+ list=readdata(path, 0);
+ }
+ if(doscan)
+ {
+ g_timeout_add(1000/10, G_SOURCE_FUNC(updatecam), 0);
+ }else{
+ doscan=1;
+ gtk_button_set_label(btn, "Rescan");
+ }
+}
+
+static void gui_save(void)
+{
+ if(!doscan){return;}
+ GtkFileChooserNative* chooser=gtk_file_chooser_native_new("Save", GTK_WINDOW(window), GTK_FILE_CHOOSER_ACTION_SAVE, "_Open", "_Cancel");
+ filefilters(GTK_FILE_CHOOSER(chooser), 0);
+ if(gtk_native_dialog_run(GTK_NATIVE_DIALOG(chooser))!=GTK_RESPONSE_ACCEPT){return;}
+ char* path=gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(chooser));
+//printf("Path: %s\n", path);
+ GtkFileFilter* type=gtk_file_chooser_get_filter(GTK_FILE_CHOOSER(chooser));
+//printf("Type: %s\n", gtk_file_filter_get_name(type));
+ if(!strcmp(gtk_file_filter_get_name(type), "Blood sugar values"))
+ {
+ FILE* f;
+ if(!strchr(path, '.'))
+ {
+ char path2[strlen(path)+strlen(".bsv0")];
+ sprintf(path2, "%s.bsv", path);
+ f=fopen(path2, "w");
+ }else{
+ f=fopen(path, "w");
+ }
+ writedata(f, list, 283, unit==21?"mmol/L":"mg/dL"); // TODO: Don't hardcode listlen=283
+ fclose(f);
+ }else{
+ GdkPixbuf* img_=gtk_image_get_pixbuf(display);
+ char* ext=strrchr(path, '.');
+ if(!ext) // Default to PNG
+ {
+ char path2[strlen(path)+strlen(".png0")];
+ sprintf(path2, "%s.png", path);
+ gdk_pixbuf_save(img_, path2, "png", 0, (void*)0);
+ }else{
+ ext=&ext[1];
+ gdk_pixbuf_save(img_, path, ext, 0, (void*)0);
+ }
+ }
+}
+
+static void switchcam(const char* dev)
+{
+ if(cam)
+ {
+ cam_free(cam);
+ cam=cam_init(dev);
+ }
+ currentcam=dev;
+}
+
+void gui_run(int** onlygrab, int unitmax)
+{
+ unit=unitmax;
+ gtk_init(0,0);
+ GtkBuilder* builder=gtk_builder_new_from_file(GLADEPATH);
+ gtk_builder_add_callback_symbol(builder, "gui_scan", G_CALLBACK(gui_scan));
+ gtk_builder_add_callback_symbol(builder, "gui_load", G_CALLBACK(gui_load));
+ gtk_builder_add_callback_symbol(builder, "gui_save", G_CALLBACK(gui_save));
+ gtk_builder_connect_signals(builder, 0);
+ display=GTK_IMAGE(gtk_builder_get_object(builder, "display"));
+ window=GTK_WIDGET(gtk_builder_get_object(builder, "window"));
+ scroll=GTK_WIDGET(gtk_builder_get_object(builder, "scroll"));
+ // Populate view-menu with available camera devices
+ // TODO: Use self-reported names from /sys/class/video4linux/videoN/name?
+ GtkWidget* viewmenu=GTK_WIDGET(gtk_builder_get_object(builder, "viewmenu"));
+ GSList* viewlist=0;
+ char devname[16];
+ int i;
+ for(i=0; i<32; i++)
+ {
+ sprintf(devname, "/dev/video%i", i);
+ if(access(devname, R_OK)){continue;}
+ char* path=strdup(devname);
+ if(!viewlist)
+ {
+ cam=cam_init(path);
+ currentcam=path;
+ }
+ GtkWidget* item=gtk_radio_menu_item_new_with_label(viewlist, devname);
+ viewlist=gtk_radio_menu_item_get_group(GTK_RADIO_MENU_ITEM(item));
+ g_signal_connect_swapped(item, "activate", G_CALLBACK(switchcam), path);
+ gtk_container_add(GTK_CONTAINER(viewmenu), item);
+ }
+ gtk_widget_show_all(window);
+ g_timeout_add(1000/10, G_SOURCE_FUNC(updatecam), onlygrab);
+ gtk_main();
+}
diff --git a/gui.glade b/gui.glade
new file mode 100644
index 0000000..87a53ee
--- /dev/null
+++ b/gui.glade
@@ -0,0 +1,196 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated with glade 3.20.0 -->
+<interface>
+ <requires lib="gtk+" version="3.20"/>
+ <object class="GtkAboutDialog" id="about">
+ <property name="can_focus">False</property>
+ <property name="modal">True</property>
+ <property name="destroy_with_parent">True</property>
+ <property name="type_hint">dialog</property>
+ <property name="program_name">LibreCGM</property>
+ <property name="version">0.1</property>
+ <property name="copyright" translatable="yes">Copyright (C) 2021 Alicia <alicia@ion.nu></property>
+ <property name="website">https://freestylenonlibre.ion.nu/</property>
+ <property name="website_label" translatable="yes">freestylenonlibre.ion.nu</property>
+ <property name="authors">Alicia <alicia@ion.nu></property>
+ <property name="logo_icon_name">image-missing</property>
+ <property name="license_type">agpl-3-0</property>
+ <signal name="response" handler="gtk_widget_hide" swapped="no"/>
+ <signal name="delete-event" handler="gtk_widget_hide" swapped="no"/>
+ <child internal-child="vbox">
+ <object class="GtkBox">
+ <property name="can_focus">False</property>
+ <property name="orientation">vertical</property>
+ <property name="spacing">2</property>
+ <child internal-child="action_area">
+ <object class="GtkButtonBox">
+ <property name="can_focus">False</property>
+ <property name="layout_style">end</property>
+ </object>
+ <packing>
+ <property name="expand">False</property>
+ <property name="fill">False</property>
+ <property name="position">0</property>
+ </packing>
+ </child>
+ <child>
+ <placeholder/>
+ </child>
+ </object>
+ </child>
+ </object>
+ <object class="GtkWindow" id="window">
+ <property name="can_focus">False</property>
+ <property name="title" translatable="yes">LibreCGM</property>
+ <property name="default_width">500</property>
+ <property name="default_height">500</property>
+ <signal name="destroy" handler="gtk_main_quit" swapped="no"/>
+ <child>
+ <object class="GtkBox">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="orientation">vertical</property>
+ <child>
+ <object class="GtkMenuBar">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <child>
+ <object class="GtkMenuItem">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">_File</property>
+ <property name="use_underline">True</property>
+ <child type="submenu">
+ <object class="GtkMenu">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <child>
+ <object class="GtkImageMenuItem">
+ <property name="label">gtk-open</property>
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="use_underline">True</property>
+ <property name="use_stock">True</property>
+ <signal name="activate" handler="gui_load" object="button" swapped="yes"/>
+ </object>
+ </child>
+ <child>
+ <object class="GtkImageMenuItem">
+ <property name="label">gtk-save</property>
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="use_underline">True</property>
+ <property name="use_stock">True</property>
+ <signal name="activate" handler="gui_save" swapped="no"/>
+ </object>
+ </child>
+ <child>
+ <object class="GtkSeparatorMenuItem">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ </object>
+ </child>
+ <child>
+ <object class="GtkImageMenuItem">
+ <property name="label">gtk-quit</property>
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="use_underline">True</property>
+ <property name="use_stock">True</property>
+ <signal name="activate" handler="gtk_main_quit" swapped="no"/>
+ </object>
+ </child>
+ </object>
+ </child>
+ </object>
+ </child>
+ <child>
+ <object class="GtkMenuItem">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">_View</property>
+ <property name="use_underline">True</property>
+ <child type="submenu">
+ <object class="GtkMenu" id="viewmenu">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ </object>
+ </child>
+ </object>
+ </child>
+ <child>
+ <object class="GtkMenuItem">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="label" translatable="yes">_Help</property>
+ <property name="use_underline">True</property>
+ <child type="submenu">
+ <object class="GtkMenu">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <child>
+ <object class="GtkImageMenuItem">
+ <property name="label">gtk-about</property>
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="use_underline">True</property>
+ <property name="use_stock">True</property>
+ <signal name="activate" handler="gtk_widget_show_all" object="about" swapped="yes"/>
+ </object>
+ </child>
+ </object>
+ </child>
+ </object>
+ </child>
+ </object>
+ <packing>
+ <property name="expand">False</property>
+ <property name="fill">True</property>
+ <property name="position">0</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkScrolledWindow" id="scroll">
+ <property name="visible">True</property>
+ <property name="can_focus">True</property>
+ <property name="hscrollbar_policy">external</property>
+ <property name="vscrollbar_policy">external</property>
+ <property name="shadow_type">in</property>
+ <child>
+ <object class="GtkViewport">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <child>
+ <object class="GtkImage" id="display">
+ <property name="visible">True</property>
+ <property name="can_focus">False</property>
+ <property name="stock">gtk-missing-image</property>
+ </object>
+ </child>
+ </object>
+ </child>
+ </object>
+ <packing>
+ <property name="expand">True</property>
+ <property name="fill">True</property>
+ <property name="position">1</property>
+ </packing>
+ </child>
+ <child>
+ <object class="GtkButton" id="button">
+ <property name="label" translatable="yes">Scan graph</property>
+ <property name="visible">True</property>
+ <property name="can_focus">True</property>
+ <property name="receives_default">True</property>
+ <signal name="clicked" handler="gui_scan" swapped="no"/>
+ </object>
+ <packing>
+ <property name="expand">False</property>
+ <property name="fill">True</property>
+ <property name="position">2</property>
+ </packing>
+ </child>
+ </object>
+ </child>
+ </object>
+</interface>
diff --git a/img.c b/img.c
new file mode 100644
index 0000000..62006c2
--- /dev/null
+++ b/img.c
@@ -0,0 +1,191 @@
+/*
+ LibreCGM, an optical reader for the Freestyle Libre
+ Copyright (C) 2021 alicia@ion.nu
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include <fontconfig/fontconfig.h>
+#include "img.h"
+
+void createimg(struct img* img, int w, int h)
+{
+ img->w=w;
+ img->h=h;
+ img->pixstride=3;
+ img->rowstride=img->w*img->pixstride;
+ img->pixels=malloc(img->h*img->rowstride);
+ memset(img->pixels, 255, img->h*img->rowstride); // Clear to white
+}
+
+void drawline(struct img* img, int* start, int* end, int color)
+{
+ int x,y;
+ unsigned char* p;
+ if(abs(start[0]-end[0])>abs(start[1]-end[1]))
+ {
+//printf("Drawing along X\n");
+ if(start[0]>end[0])
+ {
+ int* swap=start;
+ start=end;
+ end=swap;
+ }
+ int linew=end[0]-start[0];
+ int lineh=end[1]-start[1];
+ for(x=0; x<linew; x++)
+ {
+ y=x*lineh/linew;
+ if(start[0]+x<0 || start[0]+x>=img->w){continue;}
+ if(start[1]+y<0 || start[1]+y>=img->h){continue;}
+ p=pixel(img, start[0]+x, start[1]+y);
+ p[0]=(color&0xff0000)/0x10000;
+ p[1]=(color&0xff00)/0x100;
+ p[2]=(color&0xff)/0x1;
+ }
+ }else{
+//printf("Drawing along Y\n");
+ if(start[1]>end[1])
+ {
+ int* swap=start;
+ start=end;
+ end=swap;
+ }
+ int linew=end[0]-start[0];
+ int lineh=end[1]-start[1];
+ for(y=0; y<lineh; y++)
+ {
+ x=y*linew/lineh;
+ if(start[0]+x<0 || start[0]+x>=img->w){continue;}
+ if(start[1]+y<0 || start[1]+y>=img->h){continue;}
+ p=pixel(img, start[0]+x, start[1]+y);
+ p[0]=(color&0xff0000)/0x10000;
+ p[1]=(color&0xff00)/0x100;
+ p[2]=(color&0xff)/0x1;
+ }
+ }
+}
+
+void writepnm(struct img* img, const char* name)
+{
+ FILE* f=fopen(name, "w");
+ fprintf(f, "P6\n%i %i\n255\n", img->w, img->h);
+ fwrite(img->pixels, img->rowstride, img->h, f);
+ fclose(f);
+}
+
+static void text(struct img* img, int x, int y, const char* text)
+{
+ static FT_Library ft=0;
+ if(!ft && FT_Init_FreeType(&ft))
+ {
+ printf("Failed to init freetype\n");
+ return;
+ }
+ static FT_Face face=0;
+ if(!face)
+ {
+ // Find suitable font
+ FcInit();
+ FcConfig* fc=FcInitLoadConfigAndFonts();
+ FcPattern* pattern=FcNameParse((const FcChar8*)"Arial");
+ FcConfigSubstitute(fc, pattern, FcMatchPattern);
+ FcDefaultSubstitute(pattern);
+ FcResult res;
+ FcPattern* font;
+ if(!(font=FcFontMatch(fc, pattern, &res))){return;}
+ FcPatternDestroy(pattern);
+ char* file;
+ if(FcPatternGetString(font, FC_FILE, 0, (FcChar8**)&file)!=FcResultMatch){return;}
+ FcConfigDestroy(fc);
+//printf("Font: %s\n", file);
+ if(FT_New_Face(ft, file, 0, &face))
+ {
+ printf("Failed to load font\n");
+ return;
+ }
+ FcPatternDestroy(font);
+ }
+ FT_Set_Pixel_Sizes(face, 0, img->h/30);
+ int i;
+ for(i=0; text[i]; i++)
+ {
+ FT_Load_Char(face, text[i], FT_LOAD_RENDER);
+ FT_Bitmap* chr=&face->glyph->bitmap;
+ int x2=x+face->glyph->bitmap_left;
+ int y2=y-face->glyph->bitmap_top;
+ int xi, yi;
+ for(yi=0; yi<(int)chr->rows; ++yi)
+ {
+ if(y2+yi<0 || y2+yi>=img->h){continue;}
+ for(xi=0; xi<(int)chr->width; ++xi)
+ {
+ if(x2+xi<0 || x2+xi>=img->w){continue;}
+ int j;
+ for(j=0; j<3; ++j)
+ {
+ int a=img->pixels[(yi+y2)*img->rowstride+(xi+x2)*img->pixstride+j];
+ a=a*(255-(int)chr->buffer[yi*chr->width+xi])/255;
+// a+=chr->buffer[yi*chr->width+xi];
+ img->pixels[(yi+y2)*img->rowstride+(xi+x2)*img->pixstride+j]=a;
+ }
+ }
+ }
+
+ x+=face->glyph->advance.x/64;
+ y+=face->glyph->advance.y/64;
+ }
+}
+
+void drawgraph(struct img* img, int h, int listlen, int* list)
+{
+ // Label the bloodsugar level axis
+ int unitspace=(h>1000?100:10);
+ int i;
+ for(i=unitspace; i<=h; i+=unitspace)
+ {
+ int line[]={0,img->h-i*img->h/h, img->w,img->h-i*img->h/h};
+ drawline(img, line, &line[2], 0xc0c0c0);
+ char txt[16];
+ sprintf(txt, "%i", i/10);
+ text(img, 5, img->h-i*img->h/h+img->h/60, txt);
+ }
+ // Label the time axis
+ int w=img->w-25;
+ for(i=0; i<=24; i+=2)
+ {
+ int line[]={i*w/24+25, img->h, i*w/24+25, 0};
+ drawline(img, line, &line[2], 0xc0c0c0);
+ char txt[16];
+ sprintf(txt, "%i:00", i);
+ text(img, i*w/24-w/40+25, img->h, txt);
+ }
+ int lastvalid=0;
+ for(i=0; i<listlen; i++)
+ {
+ if(list[i]>=0){lastvalid=i; break;}
+ }
+ for(i=1; i<listlen; i++)
+ {
+ if(list[i]<0){continue;}
+ int line[]={25+lastvalid*(img->w-25)/listlen, img->h-list[lastvalid]*img->h/h,
+ 25+i*(img->w-25)/listlen, img->h-list[i]*img->h/h};
+ lastvalid=i;
+ drawline(img, line, &line[2], 0xff0000);
+ }
+}
diff --git a/img.h b/img.h
new file mode 100644
index 0000000..6fdea4f
--- /dev/null
+++ b/img.h
@@ -0,0 +1,30 @@
+/*
+ LibreCGM, an optical reader for the Freestyle Libre
+ Copyright (C) 2021 alicia@ion.nu
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+struct img
+{
+ unsigned char* pixels;
+ int w;
+ int h;
+ int rowstride;
+ int pixstride;
+};
+extern void createimg(struct img* img, int w, int h);
+extern void drawline(struct img* img, int* start, int* end, int color);
+extern void writepnm(struct img* img, const char* name);
+extern void drawgraph(struct img* img, int h, int listlen, int* list);
+#define pixel(img,x,y) (&(img)->pixels[(y)*(img)->rowstride+(x)*(img)->pixstride])
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..04eaca9
--- /dev/null
+++ b/main.c
@@ -0,0 +1,142 @@
+/*
+ LibreCGM, an optical reader for the Freestyle Libre
+ Copyright (C) 2021 alicia@ion.nu
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include "img.h"
+#include "data.h"
+extern int* readgraph(struct img* img, int* rect, int max);
+extern void cam_grab(struct img* img, const char* dev);
+extern void gui_run(int** onlygrab, int unitmax);
+
+enum input
+{
+ in_v4l2,
+ in_img,
+ in_data
+};
+
+static void helptext(void)
+{
+ printf("Usage: librecgm [options]\n\n"
+ "Valid options:\n"
+ "Inputs: (specifying one of these implies --nogui)\n"
+ "--cam <device> = Scan values from the given V4L2 device (e.g. /dev/video0)\n"
+ "--img <image file> = Scan values from image file\n"
+ "--data <file> = Load blood sugar values from file\n\n"
+ "Outputs:\n"
+ "--graph <file> = Render a graph and save the image to file\n"
+ "-o <file> = Save blood sugar values to file\n"
+ " (written to stdout by default)\n\n"
+ "--mgdl = Use mg/dL units instead of mmol/L\n"
+ "--nogui = Do not use the GUI\n"
+ "-h/--help = Show this help text\n");
+}
+
+int main(int argc, char** argv)
+{
+ const char* input="/dev/video0";
+ enum input inputtype=in_v4l2;
+ char* out_graph=0;
+ char* out_data=0;
+ char gui=1;
+ int unitmax=21;
+ int i;
+ for(i=1; i<argc; i++)
+ {
+ if(!strcmp(argv[i], "--cam")){input=argv[++i]; inputtype=in_v4l2; gui=0;}
+ else if(!strcmp(argv[i], "--img")){input=argv[++i]; inputtype=in_img; gui=0;}
+ else if(!strcmp(argv[i], "--data")){input=argv[++i]; inputtype=in_data; gui=0;}
+ else if(!strcmp(argv[i], "--graph")){out_graph=argv[++i];}
+ else if(!strcmp(argv[i], "-o")){out_data=argv[++i];}
+ else if(!strcmp(argv[i], "--nogui")){gui=0;}
+ else if(!strcmp(argv[i], "--mgdl")){unitmax=350;}
+ else if(!strcmp(argv[i], "-h") || !strcmp(argv[i], "--help")){helptext(); return 0;}
+ else{printf("Unknown option '%s'\n\n", argv[i]); helptext(); return 1;}
+ }
+ int* list=0;
+ int listlen=283;
+ if(gui)
+ {
+ char onlygrab=out_data||out_graph;
+ gui_run(onlygrab?&list:0, unitmax);
+ if(!onlygrab){return 0;}
+ }
+
+ struct img img={0};
+ if(!list)switch(inputtype)
+ {
+ case in_v4l2:
+ cam_grab(&img, input);
+ list=readgraph(&img, 0, unitmax*10);
+// if(img.pixels){writepnm(&img, "read.pnm");}
+ free(img.pixels);
+ break;
+ case in_img:
+ {
+ GdkPixbuf* img_=gdk_pixbuf_new_from_file(input, 0);
+ if(!img_){printf("Failed to open image '%s'\n", input); return 1;}
+ img.pixels=gdk_pixbuf_get_pixels(img_);
+ img.w=gdk_pixbuf_get_width(img_);
+ img.h=gdk_pixbuf_get_height(img_);
+ img.rowstride=gdk_pixbuf_get_rowstride(img_);
+ img.pixstride=gdk_pixbuf_get_n_channels(img_);
+ list=readgraph(&img, 0, unitmax*10);
+// if(img.pixels){writepnm(&img, "read.pnm");}
+ g_object_unref(img_);
+ }
+ break;
+ case in_data:
+ // Read list of bloodsugar levels
+ list=readdata(input, &listlen);
+ }
+
+// TODO: Filter noise (samples where the value is way off the tangents on both sides of itself)
+// Diff from average between [-1] and [+1]
+// Diff from [-1]*2-[-2]
+// Diff from [+1]*2-[+2]
+ // Output: data (just write to stdout if no file specified)
+ FILE* f=out_data?fopen(out_data,"w"):stdout;
+ writedata(f, list, listlen, unitmax==21?"mmol/L":"mg/dL");
+ if(out_data){fclose(f);}
+ // Output: graph
+ if(out_graph)
+ {
+ GdkPixbuf* img_=gdk_pixbuf_new(GDK_COLORSPACE_RGB, 0, 8, 800, 600);
+ img.pixels=gdk_pixbuf_get_pixels(img_);
+ img.w=gdk_pixbuf_get_width(img_);
+ img.h=gdk_pixbuf_get_height(img_);
+ img.rowstride=gdk_pixbuf_get_rowstride(img_);
+ img.pixstride=gdk_pixbuf_get_n_channels(img_);
+ memset(img.pixels, 255, img.h*img.rowstride); // Clear to white
+// drawgraph(&img, 210, listlen, list);
+ drawgraph(&img, unitmax*10, listlen, list);
+ char* ext=strrchr(out_graph, '.');
+ if(!ext) // Default to PNG
+ {
+ char path2[strlen(out_graph)+strlen(".png0")];
+ sprintf(path2, "%s.png", out_graph);
+ gdk_pixbuf_save(img_, path2, "png", 0, (void*)0);
+ }else{
+ ext=&ext[1];
+ gdk_pixbuf_save(img_, out_graph, ext, 0, (void*)0);
+ }
+ g_object_unref(img_);
+ }
+ // Cleanup
+ free(list);
+ return 0;
+}
diff --git a/read.c b/read.c
new file mode 100644
index 0000000..cbb4511
--- /dev/null
+++ b/read.c
@@ -0,0 +1,190 @@
+/*
+ LibreCGM, an optical reader for the Freestyle Libre
+ Copyright (C) 2021 alicia@ion.nu
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+#include "img.h"
+extern int* findrect(struct img* img);
+
+static int scanline(struct img* img, int* line, int max)
+{
+ int x,y;
+ char inverted=0;
+ int dark=INT_MAX;
+ int darkest=0;
+ int light=0;
+ int linew=line[2]-line[0];
+ int lineh=line[3]-line[1];
+ if(!linew){linew=1;}
+ if(!lineh){lineh=1;}
+ if(abs(line[0]-line[2])>abs(line[1]-line[3]))
+ {
+//printf("Scanning along X\n");
+ if(line[0]>line[2])
+ {
+ int swap[]={line[0],line[1]};
+ line[0]=line[2];
+ line[1]=line[3];
+ line[2]=swap[0];
+ line[3]=swap[1];
+ inverted=1;
+ }
+ int xrange=(img->w+img->h)/500; // TODO: Scale by (abs(linew)+abs(lineh)) instead
+ int yrange=(img->w+img->h)/1000;
+ for(x=0; x<linew; x++)
+ {
+ y=x*lineh/linew;
+//printf("Pixel %i x %i\n", startx+x, starty+y);
+ int v=0;
+ int xi, yi;
+ for(xi=-xrange; xi<=xrange; xi++)
+ {
+ for(yi=-yrange; yi<=yrange; yi++)
+ {
+ unsigned char* p=pixel(img, line[0]+x+xi, line[1]+y+yi);
+ v+=p[0]+p[1]+p[2];
+ }
+ }
+ if(v<dark){dark=v; darkest=x;}
+ if(v>light){light=v;}
+ }
+ if(dark>light*5/6){return -1;} // No line found
+ if(!inverted)
+ {
+// printf("darkest: %i (~%i mmol/10l)\n", darkest, 210-darkest*210/linew);
+ line[0]=line[0]+darkest;
+ line[1]=line[1]+darkest*lineh/linew;
+ return max-darkest*max/linew;
+ }else{
+// printf("darkest: %i (~%i mmol/10l)\n", darkest, darkest*210/linew);
+ line[2]=line[0]+darkest;
+ line[3]=line[1]+darkest*lineh/linew;
+ return darkest*max/linew;
+ }
+ }else{
+//printf("Scanning along Y\n");
+ if(line[1]>line[3])
+ {
+ int swap[]={line[0],line[1]};
+ line[0]=line[2];
+ line[1]=line[3];
+ line[2]=swap[0];
+ line[3]=swap[1];
+ inverted=1;
+ }
+ int xrange=(img->w+img->h)/1000; // TODO: Scale by (abs(linew)+abs(lineh)) instead
+ int yrange=(img->w+img->h)/500;
+ for(y=0; y<lineh; y++)
+ {
+ x=y*linew/lineh;
+//printf("Pixel %i x %i\n", startx+x, starty+y);
+ int v=0;
+ int xi, yi;
+ for(xi=-xrange; xi<=xrange; xi++)
+ {
+ for(yi=-yrange; yi<=yrange; yi++)
+ {
+ unsigned char* p=pixel(img, line[0]+x+xi, line[1]+y+yi);
+ v+=p[0]+p[1]+p[2];
+ }
+ }
+ if(v<dark){dark=v; darkest=y;}
+ if(v>light){light=v;}
+ }
+ if(dark>light*5/6){return -1;} // No line found
+ if(!inverted)
+ {
+// printf("darkest: %i (~%i mmol/10l)\n", darkest, 210-darkest*210/lineh);
+ line[0]=line[0]+darkest*linew/lineh;
+ line[1]=line[1]+darkest;
+ return max-darkest*max/lineh;
+ }else{
+// printf("darkest: %i (~%i mmol/10l)\n", darkest, darkest*210/lineh);
+ line[2]=line[0]+darkest*linew/lineh;
+ line[3]=line[1]+darkest;
+ return darkest*max/lineh;
+ }
+ }
+}
+
+int* readgraph(struct img* img, int* rect, int max)
+{
+ if(!rect){rect=findrect(img);}
+ int i;
+/*
+ printf("Rectangle detected:\n");
+ for(i=0; i<4; i++)
+ {
+ printf(" %i x %i\n", rect[i*2], rect[i*2+1]);
+ }
+*/
+ // Find the bluest corner, i.e. the "Ok" button
+ int blue=0;
+ int tmpblue;
+ int bluest;
+ for(i=0; i<4; i++)
+ {
+// drawline(img, &rect[i*2], &rect[((i+1)%4)*2], 0xff0000);
+ // Find coordinates slightly inset from the corner
+ int* a=&rect[i*2];
+ int* b=&rect[((i+1)%4)*2];
+ int* c=&rect[((i+2)%4)*2];
+ int ok[]={(a[0]+b[0]*80+c[0])/82,
+ (a[1]+b[1]*80+c[1])/82};
+// drawline(img, ok, b, 0xff0000);
+ int xi,yi;
+ int range=(img->w+img->h)/1000;
+ for(yi=-range; yi<range; yi++)
+ {
+ if(ok[1]+yi<0){continue;}
+ for(xi=-range; xi<range; xi++)
+ {
+ if(ok[0]+xi<0){continue;}
+ unsigned char* p=pixel(img, ok[0]+xi, ok[1]+yi);
+ if((tmpblue=(p[2]-(p[1]+p[0])/2))>blue){blue=tmpblue; bluest=i+1;}
+ }
+ }
+ }
+// printf("Corner %i appears to have the OK button\n", bluest);
+ int right[]={rect[((bluest)%4)*2],
+ rect[((bluest)%4)*2+1],
+ rect[((bluest+1)%4)*2],
+ rect[((bluest+1)%4)*2+1]};
+// printf("Right: %i x %i to %i x %i\n", right[0], right[1], right[2], right[3]);
+ int left[]={rect[((bluest+2)%4)*2],
+ rect[((bluest+2)%4)*2+1],
+ rect[((bluest+3)%4)*2],
+ rect[((bluest+3)%4)*2+1]};
+// printf("Left: %i x %i to %i x %i\n", left[0], left[1], left[2], left[3]);
+ #define subline(a,b,p1,p2) {((a)[0]*(p2)+(a)[2]*(p1))/(p1+p2), ((a)[1]*(p2)+(a)[3]*(p1))/(p1+p2),\
+ ((b)[0]*(p1)+(b)[2]*(p2))/(p1+p2), ((b)[1]*(p1)+(b)[3]*(p2))/(p1+p2)}
+ int top[]=subline(left, right, 8, 3);
+ int bottom[]=subline(right, left, 8, 4);
+// int header[]=subline(top, bottom, 5, 24);
+// int end[]=subline(top, bottom, 12, 1);
+// drawline(img, top, &top[2], 0xff0000);
+// drawline(img, bottom, &bottom[2], 0xff0000);
+ int* list=malloc(sizeof(int)*(12*29-65));
+ for(i=65; i<12*29; i++)
+ {
+ int slice[]=subline(top, bottom, i, 13*29-i);
+ list[i-65]=scanline(img, slice, max);
+// drawline(img, slice, &slice[2], 0xff0000);
+ }
+ return list;
+}