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Diffstat (limited to 'jni/feature_mos/src/mosaic/Interp.h')
-rw-r--r-- | jni/feature_mos/src/mosaic/Interp.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/jni/feature_mos/src/mosaic/Interp.h b/jni/feature_mos/src/mosaic/Interp.h new file mode 100644 index 000000000..19c4a40cb --- /dev/null +++ b/jni/feature_mos/src/mosaic/Interp.h @@ -0,0 +1,80 @@ +/* + * Copyright (C) 2011 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/////////////////////////////////////////////////////////// +// Interp.h +// $Id: Interp.h,v 1.2 2011/06/17 13:35:48 mbansal Exp $ + +#ifndef INTERP_H +#define INTERP_H + +#include "Pyramid.h" + +#define CTAPS 40 +static double ciTable[81] = { + 1, 0.998461, 0.993938, 0.98657, 0.9765, + 0.963867, 0.948813, 0.931477, 0.912, 0.890523, + 0.867188, 0.842133, 0.8155, 0.78743, 0.758062, + 0.727539, 0.696, 0.663586, 0.630437, 0.596695, + 0.5625, 0.527992, 0.493312, 0.458602, 0.424, + 0.389648, 0.355687, 0.322258, 0.2895, 0.257555, + 0.226562, 0.196664, 0.168, 0.140711, 0.114937, + 0.0908203, 0.0685, 0.0481172, 0.0298125, 0.0137266, + 0, -0.0118828, -0.0225625, -0.0320859, -0.0405, + -0.0478516, -0.0541875, -0.0595547, -0.064, -0.0675703, + -0.0703125, -0.0722734, -0.0735, -0.0740391, -0.0739375, + -0.0732422, -0.072, -0.0702578, -0.0680625, -0.0654609, + -0.0625, -0.0592266, -0.0556875, -0.0519297, -0.048, + -0.0439453, -0.0398125, -0.0356484, -0.0315, -0.0274141, + -0.0234375, -0.0196172, -0.016, -0.0126328, -0.0095625, + -0.00683594, -0.0045, -0.00260156, -0.0011875, -0.000304687, 0.0 +}; + +inline double ciCalc(PyramidShort *img, int xi, int yi, double xfrac, double yfrac) +{ + double tmpf[4]; + + // Interpolate using 16 points + ImageTypeShortBase *in = img->ptr[yi-1] + xi - 1; + int off = (int)(xfrac * CTAPS); + + tmpf[0] = in[0] * ciTable[off + 40]; + tmpf[0] += in[1] * ciTable[off]; + tmpf[0] += in[2] * ciTable[40 - off]; + tmpf[0] += in[3] * ciTable[80 - off]; + in += img->pitch; + tmpf[1] = in[0] * ciTable[off + 40]; + tmpf[1] += in[1] * ciTable[off]; + tmpf[1] += in[2] * ciTable[40 - off]; + tmpf[1] += in[3] * ciTable[80 - off]; + in += img->pitch; + tmpf[2] = in[0] * ciTable[off + 40]; + tmpf[2] += in[1] * ciTable[off]; + tmpf[2] += in[2] * ciTable[40 - off]; + tmpf[2] += in[3] * ciTable[80 - off]; + in += img->pitch; + tmpf[3] = in[0] * ciTable[off + 40]; + tmpf[3] += in[1] * ciTable[off]; + tmpf[3] += in[2] * ciTable[40 - off]; + tmpf[3] += in[3] * ciTable[80 - off]; + + // this is the final interpolation + off = (int)(yfrac * CTAPS); + return (ciTable[off + 40] * tmpf[0] + ciTable[off] * tmpf[1] + + ciTable[40 - off] * tmpf[2] + ciTable[80 - off] * tmpf[3]); +} + +#endif |