Allow to change imgui font size at runtime

Signed-off-by: falkTX <falktx@falktx.com>
DISTRHO · May 6, 2023 · 5acb1b9 · 5acb1b9
1 parent a0aa731
commit 5acb1b9
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Showing 2 changed files with 26 additions and 0 deletions.
diff --git a/opengl/DearImGui.cpp b/opengl/DearImGui.cpp
@@ -179,6 +179,27 @@ struct ImGuiWidget<BaseWidget>::PrivateData {
 
 // --------------------------------------------------------------------------------------------------------------------
 
+template <class BaseWidget>
+void ImGuiWidget<BaseWidget>::setFontSize(const float fontSize)
+{
+    ImGui::SetCurrentContext(imData->context);
+    ImGuiIO& io(ImGui::GetIO());
+
+    const double scaleFactor = BaseWidget::getTopLevelWidget()->getScaleFactor();
+
+   #ifndef DGL_NO_SHARED_RESOURCES
+    using namespace dpf_resources;
+    ImFontConfig fc;
+    fc.FontDataOwnedByAtlas = false;
+    fc.OversampleH = 1;
+    fc.OversampleV = 1;
+    fc.PixelSnapH = true;
+    io.Fonts->Clear();
+    io.Fonts->AddFontFromMemoryTTF((void*)dejavusans_ttf, dejavusans_ttf_size, fontSize * scaleFactor, &fc);
+    io.Fonts->Build();
+   #endif
+}
+
 template <class BaseWidget>
 void ImGuiWidget<BaseWidget>::idleCallback()
 {

diff --git a/opengl/DearImGui.hpp b/opengl/DearImGui.hpp
@@ -80,6 +80,11 @@ class ImGuiWidget : public BaseWidget,
     */
     ~ImGuiWidget() override;
 
+   /**
+      Change global font size.
+    */
+    void setFontSize(float fontSize);
+
 protected:
    /**
       New virtual onDisplay function.