ankafilters/src/kernels/templates/definitions.in

#define rotate()    pixel.x -= x_center.x; \
                    pixel.y -= y_center; \
                    pixel.x = pixel.x * cos_roll + pixel.y * sin_roll; \
                    pixel.y = -pixel.x * sin_roll + pixel.y * cos_roll; \
                    pixel.x += x_center.x; \
                    pixel.y += y_center;