()
| 137 | ) |
| 138 | |
| 139 | def _bicubic_sample(): |
| 140 | A = -0.75 |
| 141 | |
| 142 | def cubic_weight_1(x_fraction): |
| 143 | return ((A + 2) * x_fraction - (A + 3)) * x_fraction * x_fraction + 1 |
| 144 | |
| 145 | def cubic_weight_2(x_fraction): |
| 146 | return ((A * x_fraction - 5 * A) * x_fraction + 8 * A) * x_fraction - 4 * A |
| 147 | |
| 148 | def cubic_interp_1d(pixel_0, pixel_1, pixel_2, pixel_3, x_fraction): |
| 149 | weights = [0] * 4 |
| 150 | weights[0] = cubic_weight_2(x_fraction + 1) |
| 151 | weights[1] = cubic_weight_1(x_fraction) |
| 152 | weights[2] = cubic_weight_1(1 - x_fraction) |
| 153 | weights[3] = cubic_weight_2(2 - x_fraction) |
| 154 | |
| 155 | return ( |
| 156 | pixel_0 * weights[0] |
| 157 | + pixel_1 * weights[1] |
| 158 | + pixel_2 * weights[2] |
| 159 | + pixel_3 * weights[3] |
| 160 | ) |
| 161 | |
| 162 | def coefficients_along_x(x_floor, y_floor, x_fraction): |
| 163 | coefficients = [0] * 4 |
| 164 | |
| 165 | for i in range(4): |
| 166 | y_ = y_floor - 1 + i |
| 167 | x_0 = x_floor - 1 |
| 168 | x_1 = x_floor + 0 |
| 169 | x_2 = x_floor + 1 |
| 170 | x_3 = x_floor + 2 |
| 171 | |
| 172 | if padding_mode == "border": |
| 173 | y_ = _clip_coordinates(y_, in_height) |
| 174 | x_0 = _clip_coordinates(x_0, in_width) |
| 175 | x_1 = _clip_coordinates(x_1, in_width) |
| 176 | x_2 = _clip_coordinates(x_2, in_width) |
| 177 | x_3 = _clip_coordinates(x_3, in_width) |
| 178 | |
| 179 | elif padding_mode == "reflection": |
| 180 | y_ = _reflect_coordinates(y_, in_height) |
| 181 | x_0 = _reflect_coordinates(x_0, in_width) |
| 182 | x_1 = _reflect_coordinates(x_1, in_width) |
| 183 | x_2 = _reflect_coordinates(x_2, in_width) |
| 184 | x_3 = _reflect_coordinates(x_3, in_width) |
| 185 | |
| 186 | y_ = int(_clip_coordinates(y_, in_height)) |
| 187 | x_0 = int(_clip_coordinates(x_0, in_width)) |
| 188 | x_1 = int(_clip_coordinates(x_1, in_width)) |
| 189 | x_2 = int(_clip_coordinates(x_2, in_width)) |
| 190 | x_3 = int(_clip_coordinates(x_3, in_width)) |
| 191 | |
| 192 | coefficients[i] = cubic_interp_1d( |
| 193 | _get_pixel(_b, _c, y_, x_0), |
| 194 | _get_pixel(_b, _c, y_, x_1), |
| 195 | _get_pixel(_b, _c, y_, x_2), |
| 196 | _get_pixel(_b, _c, y_, x_3), |
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