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CMake: Make it possible to override the scale factor

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Co-Authored-By: Olivier Goffart <olivier.goffart@slint.dev>
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Simon Hausmann 2024-08-02 16:55:15 +02:00 • committed by Simon Hausmann
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14
api/cpp/docs/cmake_reference.md
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@ -48,3 +48,17 @@ This target property is initialised from the global `DEFAULT_SLINT_EMBED_RESOURC
# Example: when building my_application, specify that the compiler should embed the resources in the binary
set_property(TARGET my_application PROPERTY SLINT_EMBED_RESOURCES embed-files)
```
## Scale Factor for Microcontrollers
When targeting a Microcontroller, there exists no windowing system that provides a device pixel ratio to
map logical lengths in Slint (`px`) to physical pixels (`phx`). If desired, you can provide this ratio at
compile time by setting the `SLINT_SCALE_FACTOR` target property on your CMake target.
```cmake
# Example: when building my_application, specify that the scale factor shall be 2
set_property(TARGET my_application PROPERTY SLINT_SCALE_FACTOR 2.0)
```
A scale factor specified this way will also be used to pre-scale images and glyphs when used in combination
with [Resource Embedding](#resource-embedding).