image.c

linux下的FFT 频谱分析

#include <stdlib.h>
#include <stdio.h>
#include "image.h"
#include "fft-spectra.h"

color_t *get_color(char *string)
{
    color_t *color = malloc(sizeof(color_t));
    unsigned int r,g,b;

    sscanf(string,"#%2x%2x%2x",&r,&g,&b);
    color->r = r;
    color->g = g;
    color->b = b;
    return color;
}

void image_fill_rectangle(image_t *img,color_t *color, int x,int y,int width,int height)
{
    int rowstride = img->width*3;
    int idx,h,w;
    guchar *ptr;

    if ( x+width>img->width ) exit_nicely("FIXME: img width=%d, x=%d, w=%d\n",img->width,x,width);
    if ( y+height>img->height ) exit_nicely("FIXME: img height=%d, y=%d, h=%d\n",img->height,y,height);

    for (h=0; h<height; h++)
    {
        idx = rowstride*h + x*3;
        ptr = &(img->data[idx]);
        for (w=0; w<width; w++)
        {
            if ( ptr+3>&(img->data[img->width*img->height*3])) 
                exit_nicely("FIXME: image_fill_rectangle .. w=%d h=%d idx=%d; width=%d height=%d\n",
                    w,h,idx,img->width,img->height);

            *ptr = color->r; ptr++;
            *ptr = color->g; ptr++;
            *ptr = color->b; ptr++;
        }
    }
}