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API for pressure-sensitive pens + XInput2/Wayland

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This patch adds an API for querying pressure-
sensitive pens, cf. SDL_pen.h:
- Enumerate all pens
- Get pen capabilities, names, GUIDs
- Distinguishes pens and erasers
- Distinguish attached and detached pens
- Pressure and tilt support
- Rotation, distance, throttle wheel support
  (throttle wheel untested)
- Pen type and meta-information reporting
  (partially tested)

Pen event reporting:
- Three new event structures: PenTip, PenMotion, and
  PenButton
- Report location with sub-pixel precision
- Include axis and button status, is-eraser flag

Internal pen tracker, intended to be independent
of platform APIs, cf. SDL_pen_c.h:
- Track known pens
- Handle pen hotplugging

Automatic test:
- testautomation_pen.c

Other features:
- XInput2 implementation, incl. hotplugging
- Wayland implementation, incl. hotplugging
- Backward compatibility: pen events default to
  emulating pens with mouse ID SDL_PEN_MOUSEID
- Can be toggled via SDL_HINT_PEN_NOT_MOUSE
- Test/demo program (testpen)
- Wacom pen feature identification by pen ID

Acknowledgements:
- Ping Cheng (Wacom) provided extensive feedback
  on Wacom pen features and detection so that
  hopefully untested Wacom devices have a
  realistic chance of working out of the box.
This commit is contained in:
Christoph Reichenbach
2023-08-27 06:20:29 +00:00
committed by Sam Lantinga
parent d3e43668d0
commit 7c80ac6df7
36 changed files with 5843 additions and 241 deletions
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6
VisualC/tests/testautomation/testautomation.vcxproj
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@@ -209,6 +209,12 @@
<ClCompile Include="..\..\..\test\testautomation_main.c" />
<ClCompile Include="..\..\..\test\testautomation_math.c" />
<ClCompile Include="..\..\..\test\testautomation_mouse.c" />
<ClCompile Include="..\..\..\test\testautomation_pen.c">
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<AdditionalIncludeDirectories Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">$(ProjectDir)\..\..\..\src;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">$(ProjectDir)\..\..\..\src;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
<AdditionalIncludeDirectories Condition="'$(Configuration)|$(Platform)'=='Release|x64'">$(ProjectDir)\..\..\..\src;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
</ClCompile>
<ClCompile Include="..\..\..\test\testautomation_pixels.c" />
<ClCompile Include="..\..\..\test\testautomation_platform.c" />
<ClCompile Include="..\..\..\test\testautomation_properties.c" />