Function stbi__mad2sizes_valid

lite/example/cpp_example/mge/cv/stb_image.h:1051–1053

returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow

        !defined(STBI_NO_HDR)
// returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow
static int stbi__mad2sizes_valid(int a, int b, int add) {
    return stbi__mul2sizes_valid(a, b) && stbi__addsizes_valid(a * b, add);
}
#endif

// returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow