1 files changed, 33 insertions, 0 deletions
diff --git a/src/anim.cpp b/src/anim.cpp
new file mode 100644
index 00000000..f4850deb
--- /dev/null
+++ b/src/anim.cpp
@@ -0,0 +1,33 @@
+#include "anim.hpp"
+#include "compat/exception.hpp"
+#include <cmath>
+
+namespace floormat {
+
+Vector2ui anim_scale::scale_to(Vector2ui image_size) const
+{
+    fm_soft_assert(image_size.product() > 0);
+    Vector2ui ret;
+    switch (type)
+    {
+    default:
+        fm_throw("invalid anim_scale_type '{}'"_cf, (unsigned)type);
+    case anim_scale_type::invalid:
+        fm_throw("anim_scale is invalid"_cf);
+    case anim_scale_type::fixed:
+        fm_soft_assert(f.width_or_height > 0);
+        if (f.is_width)
+            ret = { f.width_or_height, (unsigned)std::round((float)f.width_or_height * (float)image_size.y()/(float)image_size.x()) };
+        else
+            ret = { (unsigned)std::round((float)f.width_or_height * (float)image_size.x()/(float)image_size.y()), f.width_or_height };
+        break;
+    case anim_scale_type::ratio:
+        fm_soft_assert(r.f > 0 && r.f <= 1);
+        ret = { (unsigned)std::round(image_size.x() * r.f), (unsigned)std::round(image_size.y() * r.f) };
+        break;
+    }
+    fm_soft_assert(ret.product() > 0);
+    return ret;
+}
+
+} // namespace floormat