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2025-08-25 09:50:30 +08:00
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+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifndef SDL_x11pen_h_
+#define SDL_x11pen_h_
+
+// Pressure-sensitive pen support for X11.
+
+#include "SDL_x11video.h"
+#include "../../events/SDL_pen_c.h"
+
+// Prep pen support (never fails; pens simply won't be added if there's a problem).
+extern void X11_InitPen(SDL_VideoDevice *_this);
+
+// Clean up pen support.
+extern void X11_QuitPen(SDL_VideoDevice *_this);
+
+#ifdef SDL_VIDEO_DRIVER_X11_XINPUT2
+
+// Forward definition for SDL_x11video.h
+struct SDL_VideoData;
+
+#define SDL_X11_PEN_AXIS_VALUATOR_MISSING -1
+
+typedef struct X11_PenHandle
+{
+    SDL_PenID pen;
+    bool is_eraser;
+    int x11_deviceid;
+    int valuator_for_axis[SDL_PEN_AXIS_COUNT];
+    float slider_bias;      // shift value to add to PEN_AXIS_SLIDER (before normalisation)
+    float rotation_bias;    // rotation to add to PEN_AXIS_ROTATION  (after normalisation)
+    float axis_min[SDL_PEN_AXIS_COUNT];
+    float axis_max[SDL_PEN_AXIS_COUNT];
+} X11_PenHandle;
+
+// Converts XINPUT2 valuators into pen axis information, including normalisation.
+extern void X11_PenAxesFromValuators(const X11_PenHandle *pen,
+                                     const double *input_values, const unsigned char *mask, int mask_len,
+                                     float axis_values[SDL_PEN_AXIS_COUNT]);
+
+// Add a pen (if this function's further checks validate it).
+extern X11_PenHandle *X11_MaybeAddPenByDeviceID(SDL_VideoDevice *_this, int deviceid);
+
+// Remove a pen. It's okay if deviceid is bogus or not a pen, we'll check it.
+extern void X11_RemovePenByDeviceID(int deviceid);
+
+// Map X11 device ID to pen ID.
+extern X11_PenHandle *X11_FindPenByDeviceID(int deviceid);
+
+#endif // SDL_VIDEO_DRIVER_X11_XINPUT2
+
+#endif // SDL_x11pen_h_