Merge commit 'dec0d4ec4153bf9fc2b78ae6c2df45b6ea8dde7a' as 'external/sdl/SDL'

external/sdl/SDL/src/video/SDL_shape_internals.h

@@ -0,0 +1,59 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 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_shape_internals_h_
+#define SDL_shape_internals_h_
+
+struct SDL_ShapeTree;
+
+typedef struct
+{
+    struct SDL_ShapeTree *upleft, *upright, *downleft, *downright;
+} SDL_QuadTreeChildren;
+
+typedef union
+{
+    SDL_QuadTreeChildren children;
+    SDL_Rect shape;
+} SDL_ShapeUnion;
+
+typedef enum
+{
+    QuadShape,
+    TransparentShape,
+    OpaqueShape
+} SDL_ShapeKind;
+
+typedef struct SDL_ShapeTree
+{
+    SDL_ShapeKind kind;
+    SDL_ShapeUnion data;
+} SDL_ShapeTree;
+
+typedef void (*SDL_TraversalFunction)(SDL_ShapeTree *, void *);
+
+extern void SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode, SDL_Surface *shape, Uint8 *bitmap, Uint8 ppb);
+extern SDL_ShapeTree *SDL_CalculateShapeTree(SDL_WindowShapeMode mode, SDL_Surface *shape);
+extern void SDL_TraverseShapeTree(SDL_ShapeTree *tree, SDL_TraversalFunction function, void *closure);
+extern void SDL_FreeShapeTree(SDL_ShapeTree **shape_tree);
+
+#endif /* SDL_shape_internals_h_ */