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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 /* $Id: db_utilities.cpp,v 1.4 2011/06/17 14:03:31 mbansal Exp $ */
     18 
     19 #include "db_utilities.h"
     20 #include <string.h>
     21 #include <stdio.h>
     22 
     23 float** db_SetupImageReferences_f(float *im,int w,int h)
     24 {
     25     int i;
     26     float **img;
     27     assert(im);
     28     img=new float* [h];
     29     for(i=0;i<h;i++)
     30     {
     31         img[i]=im+w*i;
     32     }
     33     return(img);
     34 }
     35 
     36 unsigned char** db_SetupImageReferences_u(unsigned char *im,int w,int h)
     37 {
     38     int i;
     39     unsigned char **img;
     40 
     41     assert(im);
     42 
     43     img=new unsigned char* [h];
     44     for(i=0;i<h;i++)
     45     {
     46         img[i]=im+w*i;
     47     }
     48     return(img);
     49 }
     50 float** db_AllocImage_f(int w,int h,int over_allocation)
     51 {
     52     float **img,*im;
     53 
     54     im=new float [w*h+over_allocation];
     55     img=db_SetupImageReferences_f(im,w,h);
     56 
     57     return(img);
     58 }
     59 
     60 unsigned char** db_AllocImage_u(int w,int h,int over_allocation)
     61 {
     62     unsigned char **img,*im;
     63 
     64     im=new unsigned char [w*h+over_allocation];
     65     img=db_SetupImageReferences_u(im,w,h);
     66 
     67     return(img);
     68 }
     69 
     70 void db_FreeImage_f(float **img,int h)
     71 {
     72     delete [] (img[0]);
     73     delete [] img;
     74 }
     75 
     76 void db_FreeImage_u(unsigned char **img,int h)
     77 {
     78     delete [] (img[0]);
     79     delete [] img;
     80 }
     81 
     82 // ----------------------------------------------------------------------------------------------------------- ;
     83 //
     84 // copy image (source to destination)
     85 // ---> must be a 2D image array with the same image size
     86 // ---> the size of the input and output images must be same
     87 //
     88 // ------------------------------------------------------------------------------------------------------------ ;
     89 void db_CopyImage_u(unsigned char **d,const unsigned char * const *s, int w, int h, int over_allocation)
     90 {
     91     int i;
     92 
     93     for (i=0;i<h;i++)
     94     {
     95         memcpy(d[i],s[i],w*sizeof(unsigned char));
     96     }
     97 
     98     memcpy(&d[h],&d[h],over_allocation);
     99 
    100 }
    101 
    102 inline void db_WarpImageLutFast_u(const unsigned char * const * src, unsigned char ** dst, int w, int h,
    103                                   const float * const * lut_x, const float * const * lut_y)
    104 {
    105     assert(src && dst);
    106     int xd=0, yd=0;
    107 
    108     for ( int i = 0; i < w; ++i )
    109         for ( int j = 0; j < h; ++j )
    110         {
    111             //xd = static_cast<unsigned int>(lut_x[j][i]);
    112             //yd = static_cast<unsigned int>(lut_y[j][i]);
    113             xd = (unsigned int)(lut_x[j][i]);
    114             yd = (unsigned int)(lut_y[j][i]);
    115             if ( xd >= w || yd >= h ||
    116                  xd < 0 || yd < 0)
    117                 dst[j][i] = 0;
    118             else
    119                 dst[j][i] = src[yd][xd];
    120         }
    121 }
    122 
    123 inline void db_WarpImageLutBilinear_u(const unsigned char * const * src, unsigned char ** dst, int w, int h,
    124                                       const float * const * lut_x,const float * const* lut_y)
    125 {
    126     assert(src && dst);
    127     double xd=0.0, yd=0.0;
    128 
    129     for ( int i = 0; i < w; ++i )
    130         for ( int j = 0; j < h; ++j )
    131         {
    132             xd = static_cast<double>(lut_x[j][i]);
    133             yd = static_cast<double>(lut_y[j][i]);
    134             if ( xd > w   || yd > h ||
    135                  xd < 0.0 || yd < 0.0)
    136                 dst[j][i] = 0;
    137             else
    138                 dst[j][i] = db_BilinearInterpolation(yd, xd, src);
    139         }
    140 }
    141 
    142 
    143 void db_WarpImageLut_u(const unsigned char * const * src, unsigned char ** dst, int w, int h,
    144                        const float * const * lut_x,const float * const * lut_y, int type)
    145 {
    146     switch (type)
    147     {
    148     case DB_WARP_FAST:
    149         db_WarpImageLutFast_u(src,dst,w,h,lut_x,lut_y);
    150         break;
    151     case DB_WARP_BILINEAR:
    152         db_WarpImageLutBilinear_u(src,dst,w,h,lut_x,lut_y);
    153         break;
    154     default:
    155         break;
    156     }
    157 }
    158 
    159 
    160 void db_PrintDoubleVector(double *a,long size)
    161 {
    162     printf("[ ");
    163     for(long i=0;i<size;i++) printf("%lf ",a[i]);
    164     printf("]");
    165 }
    166 
    167 void db_PrintDoubleMatrix(double *a,long rows,long cols)
    168 {
    169     printf("[\n");
    170     for(long i=0;i<rows;i++)
    171     {
    172         for(long j=0;j<cols;j++) printf("%lf ",a[i*cols+j]);
    173         printf("\n");
    174     }
    175     printf("]");
    176 }
    177