mirror of https://github.com/libsdl-org/SDL.git
73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#ifndef SDL_x11pen_h_
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#define SDL_x11pen_h_
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// Pressure-sensitive pen support for X11.
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#include "SDL_x11video.h"
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#include "../../events/SDL_pen_c.h"
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// Prep pen support (never fails; pens simply won't be added if there's a problem).
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extern void X11_InitPen(SDL_VideoDevice *_this);
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// Clean up pen support.
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extern void X11_QuitPen(SDL_VideoDevice *_this);
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#ifdef SDL_VIDEO_DRIVER_X11_XINPUT2
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// Forward definition for SDL_x11video.h
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struct SDL_VideoData;
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#define SDL_X11_PEN_AXIS_VALUATOR_MISSING -1
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typedef struct X11_PenHandle
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{
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SDL_PenID pen;
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bool is_eraser;
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int x11_deviceid;
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int valuator_for_axis[SDL_PEN_AXIS_COUNT];
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float slider_bias; // shift value to add to PEN_AXIS_SLIDER (before normalisation)
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float rotation_bias; // rotation to add to PEN_AXIS_ROTATION (after normalisation)
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float axis_min[SDL_PEN_AXIS_COUNT];
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float axis_max[SDL_PEN_AXIS_COUNT];
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} X11_PenHandle;
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// Converts XINPUT2 valuators into pen axis information, including normalisation.
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extern void X11_PenAxesFromValuators(const X11_PenHandle *pen,
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const double *input_values, const unsigned char *mask, const int mask_len,
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float axis_values[SDL_PEN_AXIS_COUNT]);
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// Add a pen (if this function's further checks validate it).
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extern X11_PenHandle *X11_MaybeAddPenByDeviceID(SDL_VideoDevice *_this, int deviceid);
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// Remove a pen. It's okay if deviceid is bogus or not a pen, we'll check it.
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extern void X11_RemovePenByDeviceID(int deviceid);
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// Map X11 device ID to pen ID.
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extern X11_PenHandle *X11_FindPenByDeviceID(int deviceid);
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#endif // SDL_VIDEO_DRIVER_X11_XINPUT2
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#endif // SDL_x11pen_h_
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