Provides a way to convert font into different format (either with or
without contents of associated glyph cache) or import/export glyph cache
(i.e. to avoid recreating it from scratch every time).
Implementation is moved into `do*()` private virtual functions, public
interface is doing additional sanity checks around them. Opening files
is by default done in base implementation, which loads the files into
memory and then calls function for opening raw data.
Added interface for opening multi-file fonts from raw data, default
implementation just calls single-file implementation.
Function for creating glyph cache converts the text from UTF-8 to UTF-32
and then calls the implementation, removing the burden from
reimplementing this in each plugin.
Added unit test for file and single data opening, bumped plugin version
to 0.2.
In next few commits AbstractFont will become plugin interface. Font
implementations are now in magnum-plugins repository. Removed all traces
of FreeType and HarfBuzz dependencies.
* Calling enable_testing() only in root path.
* Using CORRADE_CXX_FLAGS instead of our own set to make things easier
to maintain.
* Various cleanup and reorganization.
Font and text layouting is now abstracted out from its implementation.
Font class is renamed to FreeTypeFont and all the work can be done
through AbstractFont and AbstractLayouter interface.
The text will be rendered without all the nifty features like kerning
and it will most probably fail on everything non-latin, but HarfBuzz is
currently PITA on some systems.
HarfBuzz usage can be configured using USE_HARFBUZZ CMake option.
* Common layouting code in separate non-templated class.
* Direct creation of interleaved vertex array and compressed index
buffer, saves some memory operations and removes MeshTools dependency.
* Preparation for mutable TextRenderer implementation.
The library uses FreeType for glyph pre-rendering and basic glyph
geometry and HarfBuzz for text layouting (i.e. ligatures, kerning, ...).
Currently all used glyphs must be prerendered into texture atlas, other
glyphs are simply not rendered (although the layouting code handles them
like if they are there).
Text rendering supports UTF-8, although glyph pre-rendering is currently
ASCII only, as I couldn't find any working implementation of Unicode
STL function in recent GCC versions. Will be fixed later.
Vladimír Vondruš