gl: wrapper for gst_gl_framebuffer_draw_to_texture
Regarding safety, then the Box wrapping the closure is converted to raw, and then revived inside the trampoline function, where it will be dropped when it goes out of scope.
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Regarding safety, then the Box wrapping the closure is converted to raw, and then revived inside the trampoline function, where it will be dropped when it goes out of scope.