unsigned char *readppm(char *filename, int *width, int *height)
{
unsigned int x, y, ch, px;
unsigned char *img;
image image;
color_component *cp;
FILE *fp;
fopen_s(&fp, filename, "rb");
image = get_ppm(fp);
if (!image)
return NULL;
img = (unsigned char *)malloc(sizeof(unsigned char) * image->width * image->height * 3);
for (y = 0; y < image->height; ++y) {
for (x = 0; x < image->width; ++x) {
px = (y * image->width + x) * 3;
cp = GET_PIXEL(image, x, y);
for (ch = 0; ch < 3; ++ch) {
img[px + ch] = cp[ch];
}
}
}
*width = image->width;
*height = image->height;
return img;
}
int main()
{
image source;
grayimage idest;
source = get_ppm(stdin);
idest = tograyscale(source);
free_img(source);
source = tocolor(idest);
output_ppm(stdout, source);
free_img(source); free_img((image)idest);
return 0;
}
image read_image(const char *name)
{
FILE *pipe;
char buf[MAXFULLCMDBUF];
image im;
FILE *test = fopen(name, "r");
if ( test == NULL ) {
fprintf(stderr, "cannot open file %s\n", name);
return NULL;
}
fclose(test);
snprintf(buf, MAXFULLCMDBUF, "convert \"%s\" ppm:-", name);
pipe = popen(buf, "r");
if ( pipe != NULL )
{
im = get_ppm(pipe);
pclose(pipe);
return im;
}
return NULL;
}
