From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 27 Dec 2025 12:03:39 -0800
Subject: Initial commit

---
 contrib/SDL-3.2.8/src/video/x11/SDL_x11shape.c | 111 +++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 contrib/SDL-3.2.8/src/video/x11/SDL_x11shape.c

(limited to 'contrib/SDL-3.2.8/src/video/x11/SDL_x11shape.c')

diff --git a/contrib/SDL-3.2.8/src/video/x11/SDL_x11shape.c b/contrib/SDL-3.2.8/src/video/x11/SDL_x11shape.c
new file mode 100644
index 0000000..e433598
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/video/x11/SDL_x11shape.c
@@ -0,0 +1,111 @@
+/*
+  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 "SDL_x11video.h"
+#include "SDL_x11shape.h"
+
+
+#ifdef SDL_VIDEO_DRIVER_X11_XSHAPE
+static Uint8 *GenerateShapeMask(SDL_Surface *shape)
+{
+    int x, y;
+    const size_t ppb = 8;
+    const size_t bytes_per_scanline = (shape->w + (ppb - 1)) / ppb;
+    const Uint8 *a;
+    Uint8 *mask;
+    Uint8 *mask_scanline;
+    Uint8 mask_value;
+
+    mask = (Uint8 *)SDL_calloc(1, shape->h * bytes_per_scanline);
+    if (mask) {
+        for (y = 0; y < shape->h; y++) {
+            a = (const Uint8 *)shape->pixels + y * shape->pitch;
+            mask_scanline = mask + y * bytes_per_scanline;
+            for (x = 0; x < shape->w; x++) {
+                mask_value = (*a == SDL_ALPHA_TRANSPARENT) ? 0 : 1;
+                mask_scanline[x / ppb] |= mask_value << (x % ppb);
+                a += 4;
+            }
+        }
+    }
+    return mask;
+}
+#endif // SDL_VIDEO_DRIVER_X11_XSHAPE
+
+bool X11_UpdateWindowShape(SDL_VideoDevice *_this, SDL_Window *window, SDL_Surface *shape)
+{
+    bool result = false;
+
+#ifdef SDL_VIDEO_DRIVER_X11_XSHAPE
+    SDL_WindowData *windowdata = window->internal;
+
+    // Generate a set of spans for the region
+    if (shape) {
+        SDL_Surface *stretched = NULL;
+        Uint8 *mask;
+        Pixmap pixmap;
+
+        if (shape->w != window->w || shape->h != window->h) {
+            stretched = SDL_CreateSurface(window->w, window->h, SDL_PIXELFORMAT_ARGB32);
+            if (!stretched) {
+                return false;
+            }
+            if (!SDL_StretchSurface(shape, NULL, stretched, NULL, SDL_SCALEMODE_LINEAR)) {
+                SDL_DestroySurface(stretched);
+                return false;
+            }
+            shape = stretched;
+        }
+
+        mask = GenerateShapeMask(shape);
+        if (mask) {
+            pixmap = X11_XCreateBitmapFromData(windowdata->videodata->display, windowdata->xwindow, (const char *)mask, shape->w, shape->h);
+            X11_XShapeCombineMask(windowdata->videodata->display, windowdata->xwindow, ShapeInput, 0, 0, pixmap, ShapeSet);
+            SDL_free(mask);
+
+            result = true;
+        }
+
+        if (stretched) {
+            SDL_DestroySurface(stretched);
+        }
+    } else {
+        Region region = X11_XCreateRegion();
+        XRectangle rect;
+
+        rect.x = 0;
+        rect.y = 0;
+        rect.width = window->w;
+        rect.height = window->h;
+        X11_XUnionRectWithRegion(&rect, region, region);
+        X11_XShapeCombineRegion(windowdata->videodata->display, windowdata->xwindow, ShapeInput, 0, 0, region, ShapeSet);
+        X11_XDestroyRegion(region);
+        result = true;
+    }
+#endif // SDL_VIDEO_DRIVER_X11_XSHAPE
+
+    return result;
+}
+
+#endif // SDL_VIDEO_DRIVER_X11
-- 
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