message: Use signed integers for window coordinates
diff: @@ -31,7 +31,7 @@ namespace detail
  template <typename K, typename R, typename Sampler>
  VSNRAY_FUNC
  -inline auto invoke_kernel(K kernel, R r, Sampler& samp, unsigned x, unsigned y)
  +inline auto invoke_kernel(K kernel, R r, Sampler& samp, int x, int y)
  -> decltype(kernel(r))
  {
  VSNRAY_UNUSED(samp);
  @@ -48,7 +48,7 @@ template <
  typename = void
  >
  VSNRAY_FUNC
  -inline auto invoke_kernel(K kernel, R r, Sampler& samp, unsigned x, unsigned y)
  +inline auto invoke_kernel(K kernel, R r, Sampler& samp, int x, int y)
  -> decltype(kernel(r, samp))
  {
  VSNRAY_UNUSED(x);
  @@ -65,7 +65,7 @@ template <
  typename = void
  >
  VSNRAY_FUNC
  -inline auto invoke_kernel(K kernel, R r, Sampler& samp, unsigned x, unsigned y)
  +inline auto invoke_kernel(K kernel, R r, Sampler& samp, int x, int y)
  -> decltype(kernel(r, x, y))
  {
  VSNRAY_UNUSED(samp);
  