diff options
Diffstat (limited to 'source/blender/blenlib/intern/math_interp.c')
| -rw-r--r-- | source/blender/blenlib/intern/math_interp.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/source/blender/blenlib/intern/math_interp.c b/source/blender/blenlib/intern/math_interp.c index 71da270e1f2..b93a7f55821 100644 --- a/source/blender/blenlib/intern/math_interp.c +++ b/source/blender/blenlib/intern/math_interp.c @@ -57,6 +57,19 @@ static float P(float k) return (float)(1.0f / 6.0f) * (p1 * p1 * p1 - 4.0f * p2 * p2 * p2 + 6.0f * p3 * p3 * p3 - 4.0f * p4 * p4 * p4); } + +#if 0 +/* older, slower function, works the same as above */ +static float P(float k) +{ + return (float)(1.0f / 6.0f) * + (pow(MAX2(k + 2.0f, 0), 3.0f) - 4.0f * + pow(MAX2(k + 1.0f, 0), 3.0f) + 6.0f * + pow(MAX2(k, 0), 3.0f) - 4.0f * + pow(MAX2(k - 1.0f, 0), 3.0f)); +} +#endif + static void vector_from_float(const float *data, float vector[4], int components) { if (components == 1) { @@ -166,6 +179,45 @@ BLI_INLINE void bicubic_interpolation(const unsigned char *byte_buffer, const fl /* Done with optimized part */ +#if 0 + /* older, slower function, works the same as above */ + for (n = -1; n <= 2; n++) { + for (m = -1; m <= 2; m++) { + x1 = i + n; + y1 = j + m; + if (x1 > 0 && x1 < width && y1 > 0 && y1 < height) { + float data[4]; + + if (float_output) { + const float *float_data = float_buffer + width * y1 * components + components * x1; + + vector_from_float(float_data, data, components); + } + else { + const unsigned char *byte_data = byte_buffer + width * y1 * components + components * x1; + + vector_from_byte(byte_data, data, components); + } + + if (components == 1) { + out[0] += data[0] * P(n - a) * P(b - m); + } + else if (components == 3) { + out[0] += data[0] * P(n - a) * P(b - m); + out[1] += data[1] * P(n - a) * P(b - m); + out[2] += data[2] * P(n - a) * P(b - m); + } + else { + out[0] += data[0] * P(n - a) * P(b - m); + out[1] += data[1] * P(n - a) * P(b - m); + out[2] += data[2] * P(n - a) * P(b - m); + out[3] += data[3] * P(n - a) * P(b - m); + } + } + } + } +#endif + if (float_output) { if (components == 1) { float_output[0] = out[0]; |