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◆ bilinearInterpolate()
| uint8_t fl::bilinearInterpolate | ( | uint8_t | v00, |
| uint8_t | v10, | ||
| uint8_t | v01, | ||
| uint8_t | v11, | ||
| uint16_t | dx, | ||
| uint16_t | dy ) |
Definition at line 66 of file bilinear_expansion.cpp.
67 {
68 uint16_t dx_inv = 256 - dx;
69 uint16_t dy_inv = 256 - dy;
70
71 uint32_t w00 = (uint32_t)dx_inv * dy_inv;
72 uint32_t w10 = (uint32_t)dx * dy_inv;
73 uint32_t w01 = (uint32_t)dx_inv * dy;
74 uint32_t w11 = (uint32_t)dx * dy;
75
76 uint32_t sum = v00 * w00 + v10 * w10 + v01 * w01 + v11 * w11;
77
78 // Normalize the result by dividing by 65536 (shift right by 16 bits),
79 // with rounding
80 uint8_t result = (uint8_t)((sum + 32768) >> 16);
81
82 return result;
83}
Referenced by bilinearExpandArbitrary().
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