24 lines
963 B
Cython
24 lines
963 B
Cython
# cython: infer_types=True
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# cython: profile=False
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# cython: boundscheck=False
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# cython: wraparound=False
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cdef float clip(float a, float min_value, float max_value) nogil:
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"""Clip a value between min_value and max_value inclusive."""
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return min(max(a, min_value), max_value)
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cdef inline float[::1] convert_rgb_to_cam16ucs(float[:, ::1] rgb_to_cam16ucs, float r, float g, float b) nogil:
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"""Converts floating point (r,g,b) valueto 3-tuple in CAM16UCS colour space, via 24-bit RGB lookup matrix."""
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cdef unsigned int rgb_24bit = (<unsigned int>(r*255) << 16) + (<unsigned int>(g*255) << 8) + <unsigned int>(b*255)
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return rgb_to_cam16ucs[rgb_24bit]
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cdef inline double colour_distance_squared(float[::1] colour1, float[::1] colour2) nogil:
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"""Computes Euclidean squared distance between two floating-point colour 3-tuples."""
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return (colour1[0] - colour2[0]) ** 2 + (colour1[1] - colour2[1]) ** 2 + (colour1[2] - colour2[2]) ** 2
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