Subversion Repositories scarts

typedef struct _RenderInfo RenderInfo;

struct _RenderInfo

{

    int y;

    float scaley;

    int src_y;

};

static void bar(void) { }

static int

render_image_rgb_a (RenderInfo * info)

{

  int y, ye;

  float error;

  float step;

  y = info->y;

  ye = 256;

  step = 1.0 / info->scaley;

  error = y * step;

  error -= ((int) error) - step;

  for (; y < ye; y++) {

      if (error >= 1.0) {

          info->src_y += (int) error;

          error -= (int) error;

          bar();

      }

      error += step;

  }

  return info->src_y;

}

int main (void)

{

    RenderInfo info;

    info.y = 0;

    info.src_y = 0;

    info.scaley = 1.0;

    if (render_image_rgb_a(&info) != 256)

       abort ();

    exit(0);

}