Michaël Lemaire
ae19273d18
git-svn-id: https://subversion.assembla.com/svn/thunderk/paysages@552 b1fd45b6-86a6-48da-8261-f70d1f35bdcc
57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
#include "tools.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <math.h>
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double toolsRandom()
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{
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return ((double)rand()) / (double)RAND_MAX;
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}
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static inline double _cubicInterpolate(double p[4], double x)
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{
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return p[1] + 0.5 * x * (p[2] - p[0] + x * (2.0 * p[0] - 5.0 * p[1] + 4.0 * p[2] - p[3] + x * (3.0 * (p[1] - p[2]) + p[3] - p[0])));
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}
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double toolsCubicInterpolate(double stencil[4], double x)
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{
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return _cubicInterpolate(stencil, x);
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}
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double toolsBicubicInterpolate(double stencil[16], double x, double y)
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{
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double buf_cubic_y[4];
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buf_cubic_y[0] = _cubicInterpolate(stencil, x);
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buf_cubic_y[1] = _cubicInterpolate(stencil + 4, x);
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buf_cubic_y[2] = _cubicInterpolate(stencil + 8, x);
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buf_cubic_y[3] = _cubicInterpolate(stencil + 12, x);
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return _cubicInterpolate(buf_cubic_y, y);
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}
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void toolsFloat2DMapCopy(double* src, double* dest, int src_xstart, int src_ystart, int dest_xstart, int dest_ystart, int xsize, int ysize, int src_xstep, int src_ystep, int dest_xstep, int dest_ystep)
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{
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/* TODO Optimize with memcpy if src_xstep == dest_xstep == 1 */
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int x, y;
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double* src_row;
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double* dest_row;
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src += src_ystart * src_ystep + src_xstart * src_xstep;
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dest += dest_ystart * dest_ystep + dest_xstart * dest_xstep;
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for (y = 0; y < ysize; y++)
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{
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src_row = src;
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dest_row = dest;
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for (x = 0; x < xsize; x++)
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{
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*dest = *src;
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src += src_xstep;
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dest += dest_xstep;
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}
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src = src_row + src_ystep;
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dest = dest_row + dest_ystep;
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}
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}
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