Viewports: Comments on ImGuiConfigFlags_DpiEnableScaleViewports and ImGuiConfigFlags_DpiEnableScaleFonts. (#1542)

imgui.h

@@ -799,8 +799,8 @@ enum ImGuiConfigFlags_
     ImGuiConfigFlags_ViewportsEnable         = 1 << 10,  // Viewport enable flags (require both ImGuiConfigFlags_PlatformHasViewports + ImGuiConfigFlags_RendererHasViewports set by the respective back-ends)
     ImGuiConfigFlags_ViewportsNoTaskBarIcons = 1 << 11,  // Disable task bars icons for all secondary viewports (will set ImGuiViewportFlags_NoTaskBarIcon on them)
     ImGuiConfigFlags_ViewportsNoMerge        = 1 << 12,  // All floating windows _always_ have create their own viewport and platform window.
-    ImGuiConfigFlags_DpiEnableScaleViewports = 1 << 13,
-    ImGuiConfigFlags_DpiEnableScaleFonts     = 1 << 14,
+    ImGuiConfigFlags_DpiEnableScaleViewports = 1 << 13,  // Reposition and resize imgui windows when the DpiScale of a viewport changed (mostly useful for the main viewport hosting other window). Note that resizing the main window itself is up to your application.
+    ImGuiConfigFlags_DpiEnableScaleFonts     = 1 << 14,  // FIXME-DPI: Request bitmap-scaled fonts to match DpiScale. This is a very low-quality workaround. The correct way to handle DPI is _currently_ to replace the atlas and/or fonts in the Platform_OnChangedViewport callback, but this is all early work in progress.
 
     // User storage (to allow your back-end/engine to communicate to code that may be shared between multiple projects. Those flags are not used by core ImGui)
     ImGuiConfigFlags_IsSRGB                  = 1 << 20,  // Application is SRGB-aware.