Styles: Added ImGuiStyle::ScaleAllSizes(float) helper to make it easier to have application transition to e.g. High DPI with a matching style.

imgui.cpp

@@ -744,6 +744,29 @@ void ImGui::StyleColorsClassic(ImGuiStyle* dst)
     colors[ImGuiCol_ModalWindowDarkening]   = ImVec4(0.20f, 0.20f, 0.20f, 0.35f);
 }
 
+// To scale your entire UI (e.g. if you want your app to use High DPI or generally be DPI aware) you may use this helper function. Scaling the fonts is done separately and is up to you.
+// Tips: if you need to change your scale multiple times, prefer calling this on a freshly initialized ImGuiStyle structure rather than scaling multiple times (because floating point multiplications are lossy).
+void ImGuiStyle::ScaleAllSizes(float scale_factor)
+{
+    WindowPadding *= scale_factor;
+    WindowMinSize *= scale_factor;
+    WindowRounding *= scale_factor;
+    ChildWindowRounding *= scale_factor;
+    FramePadding *= scale_factor;
+    FrameRounding *= scale_factor;
+    ItemSpacing *= scale_factor;
+    ItemInnerSpacing *= scale_factor;
+    TouchExtraPadding *= scale_factor;
+    IndentSpacing *= scale_factor;
+    ColumnsMinSpacing *= scale_factor;
+    ScrollbarSize *= scale_factor;
+    ScrollbarRounding *= scale_factor;
+    GrabMinSize *= scale_factor;
+    GrabRounding *= scale_factor;
+    DisplayWindowPadding *= scale_factor;
+    DisplaySafeAreaPadding *= scale_factor;
+}
+
 ImGuiIO::ImGuiIO()
 {
     // Most fields are initialized with zero

imgui.h

@@ -769,6 +769,7 @@ struct ImGuiStyle
     ImVec4      Colors[ImGuiCol_COUNT];
 
     IMGUI_API ImGuiStyle();
+    IMGUI_API void ScaleAllSizes(float scale_factor);
 };
 
 // This is where your app communicate with ImGui. Access via ImGui::GetIO().