void SDL_TraverseShapeTree(SDL_ShapeTree *tree,SDL_TraversalFunction function,void* closure) { SDL_assert(tree != NULL); if(tree->kind == QuadShape) { SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.upleft,function,closure); SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.upright,function,closure); SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.downleft,function,closure); SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.downright,function,closure); } else function(tree,closure); }
int Win32_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowShapeMode *shape_mode) { SDL_ShapeData *data; HRGN mask_region = NULL; if( (shaper == NULL) || (shape == NULL) || ((shape->format->Amask == 0) && (shape_mode->mode != ShapeModeColorKey)) || (shape->w != shaper->window->w) || (shape->h != shaper->window->h) ) { return SDL_INVALID_SHAPE_ARGUMENT; } data = (SDL_ShapeData*)shaper->driverdata; if(data->mask_tree != NULL) SDL_FreeShapeTree(&data->mask_tree); data->mask_tree = SDL_CalculateShapeTree(*shape_mode,shape); SDL_TraverseShapeTree(data->mask_tree,&CombineRectRegions,&mask_region); SDL_assert(mask_region != NULL); SetWindowRgn(((SDL_WindowData *)(shaper->window->driverdata))->hwnd, mask_region, TRUE); return 0; }