Icon-O-Matic: Remove "using namespace" from header

Putting a "using namespace" statement (_USING_ICON_NAMESPACE in this
case) in a header file causes all source files that include that
header to use that namespace, regardless of whether they actually
wanted to.

Change-Id: I3ebf4ea3366f5f2b9068e3da88f40a7b4d98fd6b
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6897
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

Icon-O-Matic: Add perspective transformations

As part of adding perspective transformations, agg_trans_perspective.h
was patched to fix a multiple definitions error. This change has been
submitted for review to the "upstream" repositories at [1], [2],
and [3].

Also includes various other improvements such as VertexSource being
split into its own file, code style improvements, and documentation
improvements.

[1] https://sourceforge.net/p/agg/patches/6/
[2] https://github.com/ghaerr/agg-2.6/pull/9
[3] https://github.com/aggeom/agg-2.6/pull/7

Change-Id: I4bffd2f87354bde10155e23145a232a925be6ff3
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6801
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

Icon-O-Matic: replace SVG parser with nanosvg

The parser was based on an old example from agg. NanoSVG is originally
based on the same code, but has lots of bugfixes. So it makes sense
to use it.

Nanosvg revision 25241c5a8f8451d41ab1b02ab2d865b01600d949

Fixes #5955, #8586, #13021.

Change-Id: I38ff9aa4e1d403c41979ebe42f7b45d4500a870c
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2661
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

* Removed PI, and PI2 from math.h.
* Replaced all occurences with the standard macros M_PI, and M_PI_2.
* Some coding style cleanup on the touched files, no other changes besides
adding a missing check for a failed memory allocation.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31250 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Transformable::Reset() + Invert() didn't notify
* Path and StyleContainer take an index in Add...()
* FlatIconImporter works when "appending" another icon


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18448 a95241bf-73f2-0310-859d-f6bbb57e9c96

* moved all the classes actually needed for reading a
vector icon to this place, #ifdef'd out all the editing
features (listening, referencing, converting to
PropertyObject... etc)
* TODO: put into BPrivate namespace...


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18396 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Removed PI, and PI2 from math.h.
* Replaced all occurences with the standard macros M_PI, and M_PI_2.
* Some coding style cleanup on the touched files, no other changes besides
adding a missing check for a failed memory allocation.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31250 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Transformable::Reset() + Invert() didn't notify
* Path and StyleContainer take an index in Add...()
* FlatIconImporter works when "appending" another icon


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18448 a95241bf-73f2-0310-859d-f6bbb57e9c96

* moved all the classes actually needed for reading a
vector icon to this place, #ifdef'd out all the editing
features (listening, referencing, converting to
PropertyObject... etc)
* TODO: put into BPrivate namespace...


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18396 a95241bf-73f2-0310-859d-f6bbb57e9c96