/* ift_ppm.c - implementation of ift_ppm.h. */
/* Last edited on 2001-09-08 23:32:58 by stolfi */

#include "ift_ppm.h"
#include "ppm.h"

void ift_set_nodes_from_ppm_image(ppm_image *img, ImageGraph *G)
  {
    int h, v, k; 
    PixelNode *pg = &(G->node[0]);
    PixelValue yy;
    double fmaxval = (double)(img->maxval);
    if (img->cols != G->cols) { IFT_ERROR("cols mismatch"); }
    if (img->rows != G->rows) { IFT_ERROR("rows mismatch"); }
    /* Initialize unused channels: */
    for (k = 3; k < MAX_CHANNELS; k++) { yy.c[k] = 0; }
    /* Set pixels: */
    for (v = 0; v < G->rows; v++)
      for (h = 0; h < G->cols; h++)
        { pixel (*pm) = &(img->pix[v][h]);
          yy.c[0] = ((double)(PPM_GETR(*pm)))/fmaxval;
          yy.c[1] = ((double)(PPM_GETG(*pm)))/fmaxval;
          yy.c[2] = ((double)(PPM_GETB(*pm)))/fmaxval;
          pg->y = yy;
          pg++;
        }
  }