GSoc Project Proposal

[pappu kumar]

Please go through the Project and give some suggestion.
your suggestion is welcome.


<https://mailtrack.io/> Sent with Mailtrack
<https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality&>

On Thu, Mar 15, 2018 at 12:10 PM, pappu kumar <pappukr4444 at gmail.com> wrote:

> Pappu Kumar's Student Application for Multicolor Font in LibreOffice1.
> Contact Information
>
> • Email address :Pappukr4444 at gmail.com <Pappukr at gmail.com>
>
> • GitHub username : Pappukr4444 <https://github.com/pappukr4444>
>
> • LinkedIn username : Pappu Kumar
> <https://www.linkedin.com/in/pappu-kumar-586a56a5/>
>
> • Physical location :
>
> Cluster innovation Centre,
>
> University of Delhi
>
> Delhi- 110007
>
> India
>
> 2. Why do you like C++, and why do you want to work on LibreOffice?C++ is
> a general-purpose programming language It has imperative, object-oriented
> and generic programming features, while also providing facilities for
> low-level memory manipulation. C++ is the first language in which i write
> the hello world program.I am using the C++ from first year of my graduation
> it is so simple and object oriented that why i like this.I am using the
> libreoffice for general college purpose work since 2014. I found it is as
> good as paid ms Office and it is open source. The we decide to work with
> the libre office team and help them to improve the libreoffice software.3.
> What do you like about science and why? What area do you like best?My
> favourite area is Computer Science and Mathematics, as Mathematics can
> single-handedly explain many of the theoretical aspects of research fields
> that have a Computer Science background. This is based on the first-hand
> experience that I've had with fields such as Software Development, Machine
> Learning, Web Development.4. Describe your experience with the following:
>  C, C++,Java, Android other languages.
>
> • C / C++ : I've worked with both these languages for the last 5 years. I
> still use them, as low-level languages. I have already done some college
> project in C++ like Attendance management system, File system, Socket
> programming, MySQL Compiler.
>
> • Python : I usually try to use Python for machine learning projects
> because of there many great libraries that make python very handy for
> machine learning.
>
> • HTML/ CSS/ Javascript: Almost all of the Javascript exposure that I
> have, is with Web Development. I developed many websites both dynamic and
> static. I develop the website using the HTML, CSS, bootstrap and javascript.
>
> • Android/ Java:- Generally I use java for android development. I have
> already developed some android app for my college project. The project are
> the Chatting App, On This day App, and A payroll Software for Zds pvt.
> Ltd.
>
> 5. Describe your educational background (school, degree plan, major, past
> degrees, research area, publications, etc.).
>
> • Majors : 4-year Dual-degree BTech in Information Technology &
> mathematical Innovation.
>
> • Minors : Mathematics & Management
>
> I have experience in both Web Development as well as Computer Science
> research areas. I'd like to continue with Web Development for any
> innovative idea(s), in my future.
>
> 6. Please propose a project you would like to work on. Successful
> proposals will require advanced planning, communication with the project
> administrators and mentors.Support multi coloured font formats tdf#104403
> <https://bugs.documentfoundation.org/show_bug.cgi?id=104403> tdf#105488
> <https://bugs.documentfoundation.org/show_bug.cgi?id=105488>
>
> The latest version of the OpenType specification introduced few tables
> that allow for having multi-colored glyphs, which have many uses the most
> common is color Emoji.
>
> The simplest of them is COLR
> <https://www.microsoft.com/typography/otspec/colr.htm>/CPAL
> <https://www.microsoft.com/typography/otspec/cpal.htm>, which use layers
> of normal glyphs and color palettes to assign colors to each.
>
> Another alternative is SVG
> <https://www.microsoft.com/typography/otspec/svg.htm> table which embeds
> full SVG graphic for each glyph. This one might be a trickier as instead of
> rendering layered glyphs with different colors we will need to render SVG
> graphics. We already have decent SVG support, but I’m not sure how usable
> is it from a low level as text rendering in VCL.
>
>
> 1) Introduction:-
>
> “Support multi coloured font formats”. First of all I want to define the
> Multicolored font and some basic terminology that used in the Typography.
>
> Multicolor Font :- The font in which all character has more the one color.
>
> For understanding this project you should have some basic knowledge about
> the typography and
>
>    -
>
>    The understanding of the SFNT structure of OpenType fonts, the
>    different tables and their work in typography.
>    -
>
>    The basic understanding of How font are stored in the font file and
>    how the computer understands the font and how the text is rendered on the
>    computer.
>
>
> Now I want to introduce some basic terminology that is used in the
> typography.
>
> An OpenType font file contains data, in table format, that comprises
> either a TrueType or a Compact Font Format (CFF) outline font.The database,
> with its various tables, is stored in a file using a format called SFNT,
> which stands for “spline font” or “scalable font”.OpenType, TrueType,
> PostScript and a few other font types all use the SFNT representation to
> lay out their tables into a binary file. But because the SFNT
> representation is binary - that is to say, not human readable.
>
> Font - A typical font contains a few letters; it probably also contains
> some numbers, and a bunch of symbols, and maybe some other stuff too.
>
> Glyphs - a glyph is a specific design. My glyph for the letter “a” will be
> different to your glyph for the letter “a”. “A” and a and a and a are all
> different glyphs, but the same character.
>
> Horizontal height - each glyph is how wide it is - not just the black part
> of the glyph, but also including the space around it. You will often hear
> this referred to as the advance width, or the horizontal advance.
>
> Note:- that the horizontal advance is normally wider than the extremes of
> the outlines of the glyph itself:
>
> Kerns - However, to avoid spacing inconsistencies between differing glyph
> shapes (particularly between a straightedge and a round) and to make the
> type fit more comfortably, the designer of a digital font can specify that
> the layout of particular pairs of glyphs should be adjusted.
>
> Baseline - We have mentioned this already, as the imaginary line on which
> the glyphs are assembled. In a sense, it’s not really a height - in terms
> of a coordinate grid, this is the origin; the y coordinate is zero. This
> doesn’t necessarily mean that the “black part” of the glyph starts at the
> baseline. Some glyphs, such as this plus sign, have the black parts
> floating above the baseline:
>
> OpenType fonts may have the extension .OTF or .TTF, depending on the kind
> of outlines in the font and the creators desire for compatibility on
> systems without native OpenType support.
>
> In all cases, fonts with only CFF data (no TrueType outlines) always have
> an .OTF extension.
>
> Fonts containing TrueType outlines may have either .OTF or .TTF, depending
> on the desire for backward compatibility on older systems or with previous
> versions of the font.
>
> A font is a database. It’s a related collection of tables and information.
> I want to give the name of some table, tag name of that table and and why
> to used or what information are present inside that table.
>
> Whether TrueType or CFF outlines are used in an OpenType font, the
> following tables are required for the font to function correctly:
>
> Cmap - Character to glyph mapping
>
> Head - Font header
>
> Hhea - Horizontal header
>
> Hmtx - Horizontal metrics
>
> Maxp - Maximum profile
>
> Name - Naming table
>
> OS/2 OS/2 - and Windows specific metrics
>
> Post - PostScript information
>
> Tables related to TrueType outlines
>
> For OpenType fonts based on TrueType outlines, the following tables are
> used:
>
> Cvt - Control Value Table (optional table)
>
> Fpgm - Font program (optional table)
>
> Glyf - Glyph data
>
> Loca - Index to location
>
> Prep - CVT Program (optional table)
>
> Gasp - Grid-fitting/Scan-conversion (optional table)
>
>
> Table related to SVG outlines
>
> SVG - The SVG (Scalable Vector Graphics) table
>
>
> Advanced typographic tables
>
> Several optional tables support advanced typographic functions:
>
> BASE - Baseline data
>
> GDEF - Glyph definition data
>
> GPOS - Glyph positioning data
>
> GSUB - Glyph substitution data
>
> JSTF - Justification data
>
> MATH - Math layout data
>
> For information on common table formats, please see OpenType Layout Common
> Table Formats .
>
>
> Tables related to color fonts
>
> COLR Color table
>
> CPAL Color palette table
>
> CBDT Color bitmap data
>
> CBLC Color bitmap location data
>
> sbix Standard bitmap graphics
>
> SVG The SVG (Scalable Vector Graphics) table note that several of these
> tables were also listed in other sections for tables related to SVG
> outlines, and for tables related to bitmap glyphs.
>
> Both CBDT+CBLC and sbix use colored bitmaps (PNGs). FreeType (used in
> Android, macOS and iOS) supports CBDT/CBLC and sbix since version 2.5 and
> 2.5.1. DirectWrite (used in Windows) supports all four above.
>
> In this project, the table that mainly used is the table related to the
> colour font.
>
>
> II) PROJECT GOALS
>
> During this GSoC season I would deliver:
>
>    -
>
>    The multicoloured font support using the COLR and CPAL table.
>    -
>
>    The multicoloured font support using the SVG table.
>    -
>
>    Making the public API for the COLR and CPAL table so that we can use
>    the COLR and CPAL table in the LibreOffice.
>    -
>
>    There are many open source project that working on the COLR and CPAL which
>    use layers of normal glyphs and colour palettes to assign colours to each
>    like (https://github.com/harfbuzz/harfbuzz).
>    -
>
>    There is no any public library so we can make an API that can use this
>    open source project.
>    -
>
>    we can use this public API for the multi-coloured text in the
>    LibreOffice.
>
>
>
>
> III) IMPLEMENTATION
>
> There are two approaches to make LibreOffice support the multicoloured
> font.
>
> 1) Using the COLR and CPAL table:-
>
> The COLR and CPAL are the tables that designed and developed by the
> Microsoft. COLR defines one or more accompanying colour glyphs (in vector
> format) for each glyph. CPAL defines several colour themes (dark-on-white,
> white-on-dark, ...).The main aim of this table is to make the Opentype
> support the multi-coloured glyphs.Till now there are only a few open type
> font the have the colr and CPAL table in the font file. So The strategy
> will be to detect the font that has COLR/CPAL tables and if so, we read
> them and render them in the LibreOffice.
>
> For the reading the table data from the font file and rendering them in
> LibreOffice. there some open source library available that we can use in
> LibreOffice.
>
> 1). The First library that we can use is FreeType
>
> https://www.freetype.org/developer.html
>
> FreeType is a freely available software library to render fonts. It is
> written in C, designed to be small, efficient, highly customizable, and
> portable while capable of producing high-quality output (glyph images) of
> most vector and bitmap font formats.
>
> Some products that use FreeType for rendering fonts on screen or on paper,
> either exclusively or partially:
>
> GNU/Linux and other free Unix operating system derivatives like FreeBSD or
> NetBSD;
>
> iOS, Apple's mobile operating system for iPhones and iPads;
>
> Android, Google's operating system for smartphones and tablet computers;
>
> Chrome OS, Google's operating system for laptop computers;
>
> ReactOS, a free open source operating system based on the best design
> principles found in the Windows NT architecture;
>
> Ghostscript, a PostScript interpreter used in many printers.
>
> Counting the above products only, you get more than a billion devices that
> contain FreeType.
>
> 2) The Second Library that we can use is HarfBuzz
>
> https://github.com/harfbuzz/harfbuzz
>
> HarfBuzz is a text shaping engine. It solves the problem of selecting and
> positioning glyphs from a font given a Unicode string. but there is no
> public API for harfbuzz yet, so one option is to help to add public API to
> HarfBuzz and use it in the LibreOffice.
>
>
> 2) Using the SVG table
>
> The OpenType-SVG font format was initially designed by Mozilla & Adobe and
> became an industry standard in early 2016 when other big players including
> Microsoft & Google agreed on a single format to support colour fonts.
>
> Today, there are four major colour font formats that fit into regular font
> files: SBIX, COLR, CBDT and SVG, each having its own specificities.
>
> The strategy will be to detect the font that has SVG tables and if so, we
> read them and render them in the LibreOffice.
>
> For the reading the SVG table data from the font file and rendering them
> in LibreOffice. If needed, we can use some open source library.
>
> 1). The first library that we can use is SVGPath2Text
> <https://github.com/vennekamp/SVGPath2Text>
>
> If a font file has the SVG table then we simply read the data and the SVG
> path of different font and we can render them using the SvgPath2Text open
> source library. <https://github.com/vennekamp/SVGPath2Text>
>
> SVGPath2Text <https://github.com/vennekamp/SVGPath2Text> A brute force
> tool to convert SVG Outlines (aka SVG Path; SVG Glyphs) back to the text.
> Helpful if you need smaller file sizes.
>
> https://github.com/vennekamp/SVGPath2Text
>
> A brute force tool to convert SVG Outlines (aka SVG Path; SVG Glyphs) back
> to the text. Helpful if you need smaller file sizes.
>
> A Demo-SVG-File is included. This Tool maps the Glyphs (i.e. SVG Paths)
> from a template to the elements found in an SVG File.
>
> This is just a dirty hack ;-) It currently only works for the font "Comic
> Sans MS" in file size 7px; Most of the letters in the demo file are found
> correctly, but placement still needs improvement. To alter this work you
> need to change the "template letters" to your font and font size.
>
> 2) The Second Library that we can use for SVG Rendering is SVG Renderer
>
>    -
>
>    SVG Renderer library in C++
>    -
>
>    full gradient support
>    -
>
>    group opacity
>    -
>
>    all shapes support
>    -
>
>    all path elements support
>    -
>
>    render to memory
>    -
>
>    gaussian blur effect support
>
>
> svgren uses svgdom <https://github.com/igagis/svgdom> to read the SVG
> file and cairo <http://cairographics.org/> to render graphics.
>
>
> The below code give an overview of how we can we the SVGREN for the svg
> rendering.
>
>
>
> Please note, that svgren uses C++'11 features, like auto etc.
>
> First of all we need to include the svgren header file
>
> #include <svgren/render.hpp>
>
> #include <papki/FSFile.hpp> //we will need this to load the SVG file
>
> Then we need to load the SVG file and create the document object model
> (DOM), let's load the file called camera.svg
>
> auto dom = svgdom::load(papki::FSFile("camera.svg"));
>
> Then we just render the SVG into a memory buffer
>
> unsigned width = 0; //0 means use width from SVG document
>
> unsigned height = 0; //0 means use height from SVG document
>
> auto img = svgren::render(*dom, width, height); //uses 96 dpi by default
>
> //At this point the 'width' and 'height' variables were filled with
>
> //the actual width and height of the rendered image.
>
> //Returned 'img' is a std::vector<std::uint32_t> holding array of RGBA
> values.
>
> If SVG document specifies any coordinates or lengths in physical units,
> like millimeters or centimeters or inches, we have to supply the dots per
> inch (DPI) value of our physical display to the svgren::render() function
>
> unsigned width = 0; //0 means use width from SVG document
>
> unsigned height = 0; //0 means use height from SVG document
>
> auto img = svgren::render(*dom, width, height, 240); //240 dpi
>
> After that one can use the rendered image data to display it on any
> physical display or whatever.
>
>
>
>
>
>
>
>
> 7. Please provide a specific timeline for your project.
>
> Phase I - April 23rd to May 14th (Community Bonding Period)
>
> This will be the phase where I get to know more about fellow student
> developers and mentors. This period will involve more discussions regarding
> the following -
>
>
>    -
>
>    The architecture of the overall project.
>    -
>
>    what is the workflow?
>    -
>
>    Getting more about the fellow student developers and mentors.
>    -
>
>    More discussion about the library and frameworks that we are going to
>    use for our project.
>
>
> It shouldn't take such a long span of 20 days for a consensus to be
> reached. However, I've provided a buffer - just in case it takes time for a
> consensus to be reached. In case a common consensus is achieved before May
> 10th, I'll start coding for the next phase.
>
> Phase II - May 14th to June 15th (Support COLR/CPAL Multicolored font)
>
> This is the phase where the support of COLR/CPAL Multicolored Font has
> been done.
>
> During this phase, I intend to complete the code for support of COLR/CPAL
> Multicolored font, along with this testing and documentation also be done.
>
> The first step towards this is to read the binary font file and find out
> whether COLR/CPAL table is present or not. If present then read the font
> file and render them into the LibreOffice.
>
> The period of June 10th - June 15th will also provide some time to have
> any pending discussions regarding exporters / view-helpers.
>
>
>    -
>
>    *Deliverables of Phase II -*
>
>
>    1.
>
>    Support Multi Colored font with COLR and CPAL Table.
>    2.
>
>    Making some public API for using some library in LibreOffice, if
>    needed.
>
>
>
> Phase III - June 16th to July 13th (Support SVG Multicolored font)
>
> This is the phase where I work for the support of SVG Multicolored Font
> has been done.
>
> During this phase, I intend to complete the code for support of SVG
> Multicolored font, along with this testing and documentation also be done.
>
> The first step towards this is to read the binary font file and find out
> whether SVG table is present or not. If present then read the font file and
> render them into the LibreOffice.
>
> The period of 4-5 days will also provide some time to have any pending
> discussions regarding Support of the SVG Multi Colored font in the
> LibreOffice.
>
>
>    -
>
>    Deliverables of Phase III -
>
>
>    1.
>
>    Support Multi Colored font with COLR and CPAL Table.
>    2.
>
>    Making some public API for using some library in LibreOffice, if
>    needed.
>
> Phase IV - July 14th to August 6th (Presentation)
>
> Finally, a sample Multicolored font support showcasing the usage of the
> robust deliverables of Multicolored font support with LibreOffice will be
> required to help the users with getting started quickly. This should be
> done by last August (including a day of buffer), without documentation of
> the LibreOffice.
>
> As of the final phase of submissions that are from August 21st - August
> 29th, Multicolored Font Support should be deliverable, with a sample
> Example (with/without documentation) showcasing the use of the Multicolored
> font in the LibreOffice.
>
>
>    -
>
>    Deliverables of Phase IV -
>
>
>    1.
>
>    Integration of the Multicolored support in the LibreOffice.
>    2.
>
>    Final Documentation.
>    3.
>
>    Multicoloured Font Support showcasing.
>
>
>
>
>
>
> --
> Thanks and Regards,
> --
> *Pappu Kumar*
>
> *B.Tech (IT & Mathematical innovations)*
> *Cluster Innovation Centre*
> *University of Delhi*
> *Mob no.-7533093834, 9971083757*
>
>
>
> ‌
> <https://mailtrack.io/> Sent with Mailtrack
> <https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality&>
>



-- 
Thanks and Regards,
-- 
*Pappu Kumar*

*B.Tech (IT & Mathematical innovations)*
*Cluster Innovation Centre*
*University of Delhi*
*Mob no.-7533093834, 9971083757*
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/libreoffice/attachments/20180315/7c889777/attachment.html>