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◆ bilinearInterpolatePowerOf2()
| uint8_t fl::bilinearInterpolatePowerOf2 | ( | uint8_t | v00, |
| uint8_t | v10, | ||
| uint8_t | v01, | ||
| uint8_t | v11, | ||
| uint8_t | dx, | ||
| uint8_t | dy ) |
Definition at line 136 of file upscale.cpp.
137 {
138 uint16_t dx_inv = 256 - dx; // 0 to 256
139 uint16_t dy_inv = 256 - dy; // 0 to 256
140
141 // Scale down weights to fit into uint16_t
142 uint16_t w00 = (dx_inv * dy_inv) >> 8; // Max value 256
143 uint16_t w10 = (dx * dy_inv) >> 8;
144 uint16_t w01 = (dx_inv * dy) >> 8;
145 uint16_t w11 = (dx * dy) >> 8;
146
147 // Sum of weights should be approximately 256
148 uint16_t weight_sum = w00 + w10 + w01 + w11;
149
150 // Compute the weighted sum of pixel values
151 uint16_t sum = v00 * w00 + v10 * w10 + v01 * w01 + v11 * w11;
152
153 // Normalize the result
154 uint8_t result = (sum + (weight_sum >> 1)) / weight_sum;
155
156 return result;
157}
Referenced by upscalePowerOf2().
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