43 lines
1.4 KiB
Markdown
43 lines
1.4 KiB
Markdown
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# Modifying FreeType
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FreeType follows a modular architecture, i.e. all the features are
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implemented as separate modules. There are separate modules for
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rasterizers, font parsers, hinting etc. located under the `src/` directory.
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(See https://freetype.org/freetype2/docs/design/design-5.html)
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To add new features you have to either modify the existing modules or
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add a new module to FreeType.
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## Adding a new module to FreeType
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Suppose we want to add a new module "example" to FreeType:
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1. Create a directory under `src/` having the same name as the module.
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i.e. `src/example/`
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2. Add source files under src/example having `#define FT_MAKE_OPTION_SINGLE_OBJECT`
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which includes the other files to create the module.
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(See `src/sdf/sdf.c` for reference)
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3. Add the module to `include/freetype/config/ftmodule.h` according to whether
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it is a renderer, font driver or another module like:
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```C
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FT_USE_MODULE( FT_Renderer_Class, ft_example_renderer_class )
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```
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4. Add the module to `modules.cfg` in the toplevel directory:
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```
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RASTER_MODULES += example
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```
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5. Under `src/example` add `module.mk` and `rules.mk` files to enable compilation
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with `make`. (See `src/smooth/rules.mk` for reference).
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6. Now you can simply compile by using `make` in the toplevel directory and the module
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should compile.
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You can check out pre-existing modules for reference under `src/`
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