void
init_ppm(struct mandelbrot_param* param)
{
if(param->picture->data != NULL)
{
free(param->picture->data);
param->picture->data = NULL;
}
param->picture->data = malloc(ppm_align(sizeof(color_t) * param->width, PPM_ALIGNMENT) * param->height);
param->picture->height = param->height;
param->picture->width = param->width;
}
struct ppm *
ppm_alloc(int width, int height)
{
struct ppm * picture;
picture = malloc(sizeof(struct ppm));
if (picture != NULL)
{
picture->height = height;
picture->width = width;
picture->data = malloc(ppm_align(sizeof(color_t) * width, PPM_ALIGNMENT) * height);
}
return picture;
}
/**
* Converts an xy coordinate to the index of an unidimensional
* array according to the size of the picture given
*/
color_t*
coord_to_ptr(struct ppm * picture, int x, int y)
{
return (color_t*)(((char*)picture->data) + ppm_align(picture->width * sizeof(color_t), PPM_ALIGNMENT) * y + sizeof(color_t) * x);
}
