LibGfx: Add Size::match_aspect_ratio

This will create a size that matches the given aspect ratio while preserving one of the two dimensions.
Author: https://github.com/kleinesfilmroellchen Commit: https://github.com/SerenityOS/serenity/commit/af439cf3af Pull-request: https://github.com/SerenityOS/serenity/pull/15718 Reviewed-by: https://github.com/ADKaster ✅ Reviewed-by: https://github.com/AtkinsSJ Reviewed-by: https://github.com/Hendiadyoin1 Reviewed-by: https://github.com/davidot ✅ Reviewed-by: https://github.com/idispatch ✅
2022-10-21 17:05:20 +02:00 · 2022-10-21 17:05:20 +02:00 · af439cf3af · 2024-07-17 04:09:07 +09:00
commit af439cf3af
parent 5b5b4f57fa
1 changed files with 19 additions and 0 deletions
--- a/Userland/Libraries/LibGfx/Size.h
+++ b/Userland/Libraries/LibGfx/Size.h
@ -93,6 +93,25 @@ public:
        return static_cast<float>(width()) / static_cast<float>(height());
    }

+    // Horizontal means preserve the width, Vertical means preserve the height.
+    [[nodiscard]] constexpr Size<T> match_aspect_ratio(float aspect_ratio, Orientation side_to_preserve) const
+    {
+        VERIFY(aspect_ratio != 0.0f);
+        auto matched = *this;
+        auto height_corresponding_to_width = static_cast<T>(static_cast<float>(width()) / aspect_ratio);
+        auto width_corresponding_to_height = static_cast<T>(static_cast<float>(height()) * aspect_ratio);
+
+        switch (side_to_preserve) {
+        case Orientation::Vertical:
+            matched.m_width = width_corresponding_to_height;
+            break;
+        case Orientation::Horizontal:
+            matched.m_height = height_corresponding_to_width;
+            break;
+        }
+        return matched;
+    }
+
    template<typename U>
    [[nodiscard]] constexpr bool contains(Size<U> const& other) const
    {