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// void gui_post_expose(dt_iop_module_t *self, cairo_t *cr, int32_t width, int32_t height, int32_t pointerx, int32_t pointery);
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// int mouse_moved(dt_iop_module_t *self, double x, double y, int which);
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// int button_pressed(dt_iop_module_t *self, double x, double y, int which, int type, uint32_t state);
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// int button_released(struct dt_iop_module_t *self, double x, double y, int which, uint32_t state);
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// int scrolled(dt_iop_module_t *self, double x, double y, int up, uint32_t state);