[HarfBuzz] DirectWrite backend for HarfBuzz

[Ebrahim Byagowi]

Ops, here <https://github.com/behdad/harfbuzz/pull/134> is the actual patch.

On Fri, Sep 11, 2015 at 10:41 AM, Ebrahim Byagowi <ebraminio at gmail.com>
wrote:

> Hi. I have developing a dwrite backend for HarfBuzz. It is still far from
> prefect, I just thought it maybe worth to be shared but it has at least
> these main issues which I hope would be fixed with your help:
>
>    - A lot of parts of TextAnalysis is copied from this
>    <https://github.com/mozilla-services/services-central-legacy/blob/master/gfx/thebes/gfxDWriteTextAnalysis.cpp> which
>    seems added on this patch
>    <https://github.com/mozilla-services/services-central-legacy/commit/dcdb088a1041a41c819885c4d52dfff32d8fc440> and
>    is MPL licensed. I hope Bas can grant the use and re-licensing of it for
>    developing HarfBuzz.
>    - I couldn't find a way to access dwrite specific headers from
>    cygwin/mingw/msys2 and am using a cmake build configuration
>    <https://github.com/ebraminio/glcourse/blob/master/harfbuzz.cmake> for
>    using dwrite on Visual Studio. I think if we "GetProcAddress" it like what
>    we do for uniscribe backend when we decided which things we need here, but
>    well, it is going to be more painful than that even I'd guess
>    - It just work when font is set on 32 point :)
>    - It doesn't support font features configuration
>    - It uses DirectWrite GDI Interop instead IDWriteFontFileStream
>    <https://github.com/servo/skia/blob/master/src/utils/win/SkDWriteFontFileStream.h>
>    for loading the font (and many parts of the patch is actually copied from
>    uniscribe backend)
>    - It may has some more minor and major issues which I didn't remember
>    to note :)
>
> While I am not a Windows programmer and also also not being familiar with
> DirectWrite and even DirectX development, the motivation for me was just to
> have access to DirectWrite specific capabilities (explicitly, Kashida
> justification
> <https://msdn.microsoft.com/en-us/library/windows/desktop/hh994452(v=vs.85).aspx#Justification>)
> in hope the features would be developed inside harfbuzz someday (this can
> be accessed on Uniscribe backend, ScriptJustify
> <https://maxradi.us/documents/uniscribe/#ScriptJustify> which I probably
> would dig more if I see there would not any possible progress on this
> approach). This patch is far from prefect but I just hoped this would be
> useful for someone someday or would be merged on HarfBuzz :)
>
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