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int gx,gy;
int wx,wy;
int ww,wh;
SDL_GetGlobalMouseState(&gx,&gy);
printf("Global mouse state x: %d, y: %d\n",gx,gy);

SDL_GetWindowPosition(Window,&wx,&wy);
printf("Window position x: %d, y: %d\n",wx,wy);

SDL_GetGlobalMouseState(&gx,&gy);
printf("Global mouse state x: %d, y: %d\n",gx,gy);

SDL_GetWindowSize(Window,&ww,&wh);
printf("Window size x: %d, y: %d\n",ww,wh);

SDL_GetGlobalMouseState(&gx,&gy);
printf("Global mouse state x: %d, y: %d\n",gx,gy);

if (gx>=wx && gx<=(wx+ww) && gy>=wy && gy<=(wy+wh)) {
    SDL_WarpMouseInWindow(Window,gx-wx,gy-wy);
}

SDL_GetGlobalMouseState(&gx,&gy);
printf("Global mouse state x: %d, y: %d\n",gx,gy);


console output:
Global mouse state x: 696, y: 431
Window position x: 560, y: 300
Global mouse state x: 696, y: 431
Window size x: 800, y: 600
Global mouse state x: 696, y: 431
Global mouse state x: 696, y: 468

If mouse cursor is on top of the Window the cursor drops down 37 pixels which is the height of the window title bar.