1 files changed, 552 insertions, 0 deletions

diff --git a/contrib/SDL-3.2.8/src/video/x11/SDL_x11mouse.c b/contrib/SDL-3.2.8/src/video/x11/SDL_x11mouse.c
new file mode 100644
index 0000000..5c72dbf
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/video/x11/SDL_x11mouse.c
@@ -0,0 +1,552 @@
+/*
+  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"
+
+#ifdef SDL_VIDEO_DRIVER_X11
+
+#include <X11/cursorfont.h>
+#include "SDL_x11video.h"
+#include "SDL_x11mouse.h"
+#include "SDL_x11xinput2.h"
+#include "../SDL_video_c.h"
+#include "../../events/SDL_mouse_c.h"
+
+struct SDL_CursorData
+{
+    Cursor cursor;
+};
+
+// FIXME: Find a better place to put this...
+static Cursor x11_empty_cursor = None;
+static bool x11_cursor_visible = true;
+
+static SDL_Cursor *sys_cursors[SDL_HITTEST_RESIZE_LEFT + 1];
+
+static Display *GetDisplay(void)
+{
+    return SDL_GetVideoDevice()->internal->display;
+}
+
+static Cursor X11_CreateEmptyCursor(void)
+{
+    if (x11_empty_cursor == None) {
+        Display *display = GetDisplay();
+        char data[1];
+        XColor color;
+        Pixmap pixmap;
+
+        SDL_zeroa(data);
+        color.red = color.green = color.blue = 0;
+        pixmap = X11_XCreateBitmapFromData(display, DefaultRootWindow(display),
+                                           data, 1, 1);
+        if (pixmap) {
+            x11_empty_cursor = X11_XCreatePixmapCursor(display, pixmap, pixmap,
+                                                       &color, &color, 0, 0);
+            X11_XFreePixmap(display, pixmap);
+        }
+    }
+    return x11_empty_cursor;
+}
+
+static void X11_DestroyEmptyCursor(void)
+{
+    if (x11_empty_cursor != None) {
+        X11_XFreeCursor(GetDisplay(), x11_empty_cursor);
+        x11_empty_cursor = None;
+    }
+}
+
+static SDL_Cursor *X11_CreateCursorAndData(Cursor x11_cursor)
+{
+    SDL_Cursor *cursor = (SDL_Cursor *)SDL_calloc(1, sizeof(*cursor));
+    if (cursor) {
+        SDL_CursorData *data = (SDL_CursorData *)SDL_calloc(1, sizeof(*data));
+        if (!data) {
+            SDL_free(cursor);
+            return NULL;
+        }
+        data->cursor = x11_cursor;
+        cursor->internal = data;
+    }
+    return cursor;
+}
+
+#ifdef SDL_VIDEO_DRIVER_X11_XCURSOR
+static Cursor X11_CreateXCursorCursor(SDL_Surface *surface, int hot_x, int hot_y)
+{
+    Display *display = GetDisplay();
+    Cursor cursor = None;
+    XcursorImage *image;
+
+    image = X11_XcursorImageCreate(surface->w, surface->h);
+    if (!image) {
+        SDL_OutOfMemory();
+        return None;
+    }
+    image->xhot = hot_x;
+    image->yhot = hot_y;
+    image->delay = 0;
+
+    SDL_assert(surface->format == SDL_PIXELFORMAT_ARGB8888);
+    SDL_assert(surface->pitch == surface->w * 4);
+    SDL_memcpy(image->pixels, surface->pixels, (size_t)surface->h * surface->pitch);
+
+    cursor = X11_XcursorImageLoadCursor(display, image);
+
+    X11_XcursorImageDestroy(image);
+
+    return cursor;
+}
+#endif // SDL_VIDEO_DRIVER_X11_XCURSOR
+
+static Cursor X11_CreatePixmapCursor(SDL_Surface *surface, int hot_x, int hot_y)
+{
+    Display *display = GetDisplay();
+    XColor fg, bg;
+    Cursor cursor = None;
+    Uint32 *ptr;
+    Uint8 *data_bits, *mask_bits;
+    Pixmap data_pixmap, mask_pixmap;
+    int x, y;
+    unsigned int rfg, gfg, bfg, rbg, gbg, bbg, fgBits, bgBits;
+    size_t width_bytes = ((surface->w + 7) & ~((size_t)7)) / 8;
+
+    data_bits = SDL_calloc(1, surface->h * width_bytes);
+    if (!data_bits) {
+        return None;
+    }
+
+    mask_bits = SDL_calloc(1, surface->h * width_bytes);
+    if (!mask_bits) {
+        SDL_free(data_bits);
+        return None;
+    }
+
+    // Code below assumes ARGB pixel format
+    SDL_assert(surface->format == SDL_PIXELFORMAT_ARGB8888);
+
+    rfg = gfg = bfg = rbg = gbg = bbg = fgBits = bgBits = 0;
+    for (y = 0; y < surface->h; ++y) {
+        ptr = (Uint32 *)((Uint8 *)surface->pixels + y * surface->pitch);
+        for (x = 0; x < surface->w; ++x) {
+            int alpha = (*ptr >> 24) & 0xff;
+            int red = (*ptr >> 16) & 0xff;
+            int green = (*ptr >> 8) & 0xff;
+            int blue = (*ptr >> 0) & 0xff;
+            if (alpha > 25) {
+                mask_bits[y * width_bytes + x / 8] |= (0x01 << (x % 8));
+
+                if ((red + green + blue) > 0x40) {
+                    fgBits++;
+                    rfg += red;
+                    gfg += green;
+                    bfg += blue;
+                    data_bits[y * width_bytes + x / 8] |= (0x01 << (x % 8));
+                } else {
+                    bgBits++;
+                    rbg += red;
+                    gbg += green;
+                    bbg += blue;
+                }
+            }
+            ++ptr;
+        }
+    }
+
+    if (fgBits) {
+        fg.red = rfg * 257 / fgBits;
+        fg.green = gfg * 257 / fgBits;
+        fg.blue = bfg * 257 / fgBits;
+    } else {
+        fg.red = fg.green = fg.blue = 0;
+    }
+
+    if (bgBits) {
+        bg.red = rbg * 257 / bgBits;
+        bg.green = gbg * 257 / bgBits;
+        bg.blue = bbg * 257 / bgBits;
+    } else {
+        bg.red = bg.green = bg.blue = 0;
+    }
+
+    data_pixmap = X11_XCreateBitmapFromData(display, DefaultRootWindow(display),
+                                            (char *)data_bits,
+                                            surface->w, surface->h);
+    mask_pixmap = X11_XCreateBitmapFromData(display, DefaultRootWindow(display),
+                                            (char *)mask_bits,
+                                            surface->w, surface->h);
+    cursor = X11_XCreatePixmapCursor(display, data_pixmap, mask_pixmap,
+                                     &fg, &bg, hot_x, hot_y);
+    X11_XFreePixmap(display, data_pixmap);
+    X11_XFreePixmap(display, mask_pixmap);
+    SDL_free(data_bits);
+    SDL_free(mask_bits);
+
+    return cursor;
+}
+
+static SDL_Cursor *X11_CreateCursor(SDL_Surface *surface, int hot_x, int hot_y)
+{
+    Cursor x11_cursor = None;
+
+#ifdef SDL_VIDEO_DRIVER_X11_XCURSOR
+    if (SDL_X11_HAVE_XCURSOR) {
+        x11_cursor = X11_CreateXCursorCursor(surface, hot_x, hot_y);
+    }
+#endif
+    if (x11_cursor == None) {
+        x11_cursor = X11_CreatePixmapCursor(surface, hot_x, hot_y);
+    }
+    return X11_CreateCursorAndData(x11_cursor);
+}
+
+static unsigned int GetLegacySystemCursorShape(SDL_SystemCursor id)
+{
+    switch (id) {
+        // X Font Cursors reference:
+        // http://tronche.com/gui/x/xlib/appendix/b/
+        case SDL_SYSTEM_CURSOR_DEFAULT: return XC_left_ptr;
+        case SDL_SYSTEM_CURSOR_TEXT: return XC_xterm;
+        case SDL_SYSTEM_CURSOR_WAIT: return XC_watch;
+        case SDL_SYSTEM_CURSOR_CROSSHAIR: return XC_tcross;
+        case SDL_SYSTEM_CURSOR_PROGRESS: return XC_watch;
+        case SDL_SYSTEM_CURSOR_NWSE_RESIZE: return XC_top_left_corner;
+        case SDL_SYSTEM_CURSOR_NESW_RESIZE: return XC_top_right_corner;
+        case SDL_SYSTEM_CURSOR_EW_RESIZE: return XC_sb_h_double_arrow;
+        case SDL_SYSTEM_CURSOR_NS_RESIZE: return XC_sb_v_double_arrow;
+        case SDL_SYSTEM_CURSOR_MOVE: return XC_fleur;
+        case SDL_SYSTEM_CURSOR_NOT_ALLOWED: return XC_pirate;
+        case SDL_SYSTEM_CURSOR_POINTER: return XC_hand2;
+        case SDL_SYSTEM_CURSOR_NW_RESIZE: return XC_top_left_corner;
+        case SDL_SYSTEM_CURSOR_N_RESIZE: return XC_top_side;
+        case SDL_SYSTEM_CURSOR_NE_RESIZE: return XC_top_right_corner;
+        case SDL_SYSTEM_CURSOR_E_RESIZE: return XC_right_side;
+        case SDL_SYSTEM_CURSOR_SE_RESIZE: return XC_bottom_right_corner;
+        case SDL_SYSTEM_CURSOR_S_RESIZE: return XC_bottom_side;
+        case SDL_SYSTEM_CURSOR_SW_RESIZE: return XC_bottom_left_corner;
+        case SDL_SYSTEM_CURSOR_W_RESIZE: return XC_left_side;
+        case SDL_SYSTEM_CURSOR_COUNT: break;  // so the compiler might notice if an enum value is missing here.
+    }
+
+    SDL_assert(0);
+    return 0;
+}
+
+static SDL_Cursor *X11_CreateSystemCursor(SDL_SystemCursor id)
+{
+    SDL_Cursor *cursor = NULL;
+    Display *dpy = GetDisplay();
+    Cursor x11_cursor = None;
+
+#ifdef SDL_VIDEO_DRIVER_X11_XCURSOR
+    if (SDL_X11_HAVE_XCURSOR) {
+        x11_cursor = X11_XcursorLibraryLoadCursor(dpy, SDL_GetCSSCursorName(id, NULL));
+    }
+#endif
+
+    if (x11_cursor == None) {
+        x11_cursor = X11_XCreateFontCursor(dpy, GetLegacySystemCursorShape(id));
+    }
+
+    if (x11_cursor != None) {
+        cursor = X11_CreateCursorAndData(x11_cursor);
+    }
+
+    return cursor;
+}
+
+static SDL_Cursor *X11_CreateDefaultCursor(void)
+{
+    SDL_SystemCursor id = SDL_GetDefaultSystemCursor();
+    return X11_CreateSystemCursor(id);
+}
+
+static void X11_FreeCursor(SDL_Cursor *cursor)
+{
+    Cursor x11_cursor = cursor->internal->cursor;
+
+    if (x11_cursor != None) {
+        X11_XFreeCursor(GetDisplay(), x11_cursor);
+    }
+    SDL_free(cursor->internal);
+    SDL_free(cursor);
+}
+
+static bool X11_ShowCursor(SDL_Cursor *cursor)
+{
+    Cursor x11_cursor = 0;
+
+    if (cursor) {
+        x11_cursor = cursor->internal->cursor;
+    } else {
+        x11_cursor = X11_CreateEmptyCursor();
+    }
+
+    // FIXME: Is there a better way than this?
+    {
+        SDL_VideoDevice *video = SDL_GetVideoDevice();
+        Display *display = GetDisplay();
+        SDL_Window *window;
+
+        x11_cursor_visible = !!cursor;
+
+        for (window = video->windows; window; window = window->next) {
+            SDL_WindowData *data = window->internal;
+            if (data) {
+                if (x11_cursor != None) {
+                    X11_XDefineCursor(display, data->xwindow, x11_cursor);
+                } else {
+                    X11_XUndefineCursor(display, data->xwindow);
+                }
+            }
+        }
+        X11_XFlush(display);
+    }
+    return true;
+}
+
+static void X11_WarpMouseInternal(Window xwindow, float x, float y)
+{
+    SDL_VideoData *videodata = SDL_GetVideoDevice()->internal;
+    Display *display = videodata->display;
+    bool warp_hack = false;
+
+    // XWayland will only warp the cursor if it is hidden, so this workaround is required.
+    if (videodata->is_xwayland && x11_cursor_visible) {
+        warp_hack = true;
+    }
+
+    if (warp_hack) {
+        X11_ShowCursor(NULL);
+    }
+#ifdef SDL_VIDEO_DRIVER_X11_XINPUT2
+    int deviceid = 0;
+    if (X11_Xinput2IsInitialized()) {
+        /* It seems XIWarpPointer() doesn't work correctly on multi-head setups:
+         * https://developer.blender.org/rB165caafb99c6846e53d11c4e966990aaffc06cea
+         */
+        if (ScreenCount(display) == 1) {
+            X11_XIGetClientPointer(display, None, &deviceid);
+        }
+    }
+    if (deviceid != 0) {
+        SDL_assert(SDL_X11_HAVE_XINPUT2);
+        X11_XIWarpPointer(display, deviceid, None, xwindow, 0.0, 0.0, 0, 0, x, y);
+    } else
+#endif
+    {
+        X11_XWarpPointer(display, None, xwindow, 0, 0, 0, 0, (int)x, (int)y);
+    }
+
+    if (warp_hack) {
+        X11_ShowCursor(SDL_GetCursor());
+    }
+    X11_XSync(display, False);
+    videodata->global_mouse_changed = true;
+}
+
+static bool X11_WarpMouse(SDL_Window *window, float x, float y)
+{
+    SDL_WindowData *data = window->internal;
+
+#ifdef SDL_VIDEO_DRIVER_X11_XFIXES
+    // If we have no barrier, we need to warp
+    if (data->pointer_barrier_active == false) {
+        X11_WarpMouseInternal(data->xwindow, x, y);
+    }
+#else
+    X11_WarpMouseInternal(data->xwindow, x, y);
+#endif
+    return true;
+}
+
+static bool X11_WarpMouseGlobal(float x, float y)
+{
+    X11_WarpMouseInternal(DefaultRootWindow(GetDisplay()), x, y);
+    return true;
+}
+
+static bool X11_SetRelativeMouseMode(bool enabled)
+{
+    if (!X11_Xinput2IsInitialized()) {
+        return SDL_Unsupported();
+    }
+    return true;
+}
+
+static bool X11_CaptureMouse(SDL_Window *window)
+{
+    Display *display = GetDisplay();
+    SDL_Window *mouse_focus = SDL_GetMouseFocus();
+
+    if (window) {
+        SDL_WindowData *data = window->internal;
+
+        /* If XInput2 is handling the pointer input, non-confinement grabs will always fail with 'AlreadyGrabbed',
+         * since the pointer is being grabbed by XInput2.
+         */
+        if (!data->xinput2_mouse_enabled || data->mouse_grabbed) {
+            const unsigned int mask = ButtonPressMask | ButtonReleaseMask | PointerMotionMask | FocusChangeMask;
+            Window confined = (data->mouse_grabbed ? data->xwindow : None);
+            const int rc = X11_XGrabPointer(display, data->xwindow, False,
+                                            mask, GrabModeAsync, GrabModeAsync,
+                                            confined, None, CurrentTime);
+            if (rc != GrabSuccess) {
+                return SDL_SetError("X server refused mouse capture");
+            }
+
+            if (data->mouse_grabbed) {
+                // XGrabPointer can warp the cursor when confining, so update the coordinates.
+                data->videodata->global_mouse_changed = true;
+            }
+        }
+    } else if (mouse_focus) {
+        SDL_UpdateWindowGrab(mouse_focus);
+    } else {
+        X11_XUngrabPointer(display, CurrentTime);
+    }
+
+    X11_XSync(display, False);
+
+    return true;
+}
+
+static SDL_MouseButtonFlags X11_GetGlobalMouseState(float *x, float *y)
+{
+    SDL_VideoData *videodata = SDL_GetVideoDevice()->internal;
+    SDL_DisplayID *displays;
+    Display *display = GetDisplay();
+    int i;
+
+    // !!! FIXME: should we XSync() here first?
+
+    if (!X11_Xinput2IsInitialized()) {
+        videodata->global_mouse_changed = true;
+    }
+
+    // check if we have this cached since XInput last saw the mouse move.
+    // !!! FIXME: can we just calculate this from XInput's events?
+    if (videodata->global_mouse_changed) {
+        displays = SDL_GetDisplays(NULL);
+        if (displays) {
+            for (i = 0; displays[i]; ++i) {
+                SDL_DisplayData *data = SDL_GetDisplayDriverData(displays[i]);
+                if (data) {
+                    Window root, child;
+                    int rootx, rooty, winx, winy;
+                    unsigned int mask;
+                    if (X11_XQueryPointer(display, RootWindow(display, data->screen), &root, &child, &rootx, &rooty, &winx, &winy, &mask)) {
+                        XWindowAttributes root_attrs;
+                        SDL_MouseButtonFlags buttons = 0;
+                        buttons |= (mask & Button1Mask) ? SDL_BUTTON_LMASK : 0;
+                        buttons |= (mask & Button2Mask) ? SDL_BUTTON_MMASK : 0;
+                        buttons |= (mask & Button3Mask) ? SDL_BUTTON_RMASK : 0;
+                        // Use the SDL state for the extended buttons - it's better than nothing
+                        buttons |= (SDL_GetMouseState(NULL, NULL) & (SDL_BUTTON_X1MASK | SDL_BUTTON_X2MASK));
+                        /* SDL_DisplayData->x,y point to screen origin, and adding them to mouse coordinates relative to root window doesn't do the right thing
+                         * (observed on dual monitor setup with primary display being the rightmost one - mouse was offset to the right).
+                         *
+                         * Adding root position to root-relative coordinates seems to be a better way to get absolute position. */
+                        X11_XGetWindowAttributes(display, root, &root_attrs);
+                        videodata->global_mouse_position.x = root_attrs.x + rootx;
+                        videodata->global_mouse_position.y = root_attrs.y + rooty;
+                        videodata->global_mouse_buttons = buttons;
+                        videodata->global_mouse_changed = false;
+                        break;
+                    }
+                }
+            }
+            SDL_free(displays);
+        }
+    }
+
+    SDL_assert(!videodata->global_mouse_changed); // The pointer wasn't on any X11 screen?!
+
+    *x = (float)videodata->global_mouse_position.x;
+    *y = (float)videodata->global_mouse_position.y;
+    return videodata->global_mouse_buttons;
+}
+
+void X11_InitMouse(SDL_VideoDevice *_this)
+{
+    SDL_Mouse *mouse = SDL_GetMouse();
+
+    mouse->CreateCursor = X11_CreateCursor;
+    mouse->CreateSystemCursor = X11_CreateSystemCursor;
+    mouse->ShowCursor = X11_ShowCursor;
+    mouse->FreeCursor = X11_FreeCursor;
+    mouse->WarpMouse = X11_WarpMouse;
+    mouse->WarpMouseGlobal = X11_WarpMouseGlobal;
+    mouse->SetRelativeMouseMode = X11_SetRelativeMouseMode;
+    mouse->CaptureMouse = X11_CaptureMouse;
+    mouse->GetGlobalMouseState = X11_GetGlobalMouseState;
+
+    SDL_HitTestResult r = SDL_HITTEST_NORMAL;
+    while (r <= SDL_HITTEST_RESIZE_LEFT) {
+        switch (r) {
+        case SDL_HITTEST_NORMAL: sys_cursors[r] = X11_CreateSystemCursor(SDL_SYSTEM_CURSOR_DEFAULT); break;
+        case SDL_HITTEST_DRAGGABLE: sys_cursors[r] = X11_CreateSystemCursor(SDL_SYSTEM_CURSOR_DEFAULT); break;
+        case SDL_HITTEST_RESIZE_TOPLEFT: sys_cursors[r] = X11_CreateSystemCursor(SDL_SYSTEM_CURSOR_NW_RESIZE); break;
+        case SDL_HITTEST_RESIZE_TOP: sys_cursors[r] = X11_CreateSystemCursor(SDL_SYSTEM_CURSOR_N_RESIZE); break;
+        case SDL_HITTEST_RESIZE_TOPRIGHT: sys_cursors[r] = X11_CreateSystemCursor(SDL_SYSTEM_CURSOR_NE_RESIZE); break;
+        case SDL_HITTEST_RESIZE_RIGHT: sys_cursors[r] = X11_CreateSystemCursor(SDL_SYSTEM_CURSOR_E_RESIZE); break;
+        case SDL_HITTEST_RESIZE_BOTTOMRIGHT: sys_cursors[r] = X11_CreateSystemCursor(SDL_SYSTEM_CURSOR_SE_RESIZE); break;
+        case SDL_HITTEST_RESIZE_BOTTOM: sys_cursors[r] = X11_CreateSystemCursor(SDL_SYSTEM_CURSOR_S_RESIZE); break;
+        case SDL_HITTEST_RESIZE_BOTTOMLEFT: sys_cursors[r] = X11_CreateSystemCursor(SDL_SYSTEM_CURSOR_SW_RESIZE); break;
+        case SDL_HITTEST_RESIZE_LEFT: sys_cursors[r] = X11_CreateSystemCursor(SDL_SYSTEM_CURSOR_W_RESIZE); break;
+        }
+        r++;
+    }
+
+    SDL_SetDefaultCursor(X11_CreateDefaultCursor());
+}
+
+void X11_QuitMouse(SDL_VideoDevice *_this)
+{
+    SDL_VideoData *data = _this->internal;
+    SDL_XInput2DeviceInfo *i;
+    SDL_XInput2DeviceInfo *next;
+    int j;
+
+    for (j = 0; j < SDL_arraysize(sys_cursors); j++) {
+        X11_FreeCursor(sys_cursors[j]);
+        sys_cursors[j] = NULL;
+    }
+
+    for (i = data->mouse_device_info; i; i = next) {
+        next = i->next;
+        SDL_free(i);
+    }
+    data->mouse_device_info = NULL;
+
+    X11_DestroyEmptyCursor();
+}
+
+void X11_SetHitTestCursor(SDL_HitTestResult rc)
+{
+    if (rc == SDL_HITTEST_NORMAL || rc == SDL_HITTEST_DRAGGABLE) {
+        SDL_SetCursor(NULL);
+    } else {
+        X11_ShowCursor(sys_cursors[rc]);
+    }
+}
+
+#endif // SDL_VIDEO_DRIVER_X11