From 9508aaf4766dac392686301bff0d9fb4543ed75a Mon Sep 17 00:00:00 2001
From: alcomposer <alcomposer@users.noreply.github.com>
Date: Sat, 23 Mar 2024 17:52:01 +1030
Subject: [PATCH] fix crash on w11 opengl when resizing window from corner:
 https://github.com/ocornut/imgui/issues/3321

---
 Source/NVGSurface.cpp   | 28 ++++++++++++++++++++++++++++
 Source/NVGSurface.h     | 14 +++++++++++++-
 Source/PluginEditor.cpp |  2 +-
 3 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/Source/NVGSurface.cpp b/Source/NVGSurface.cpp
index fc340f1ad..f9a5356b9 100644
--- a/Source/NVGSurface.cpp
+++ b/Source/NVGSurface.cpp
@@ -87,6 +87,8 @@ NVGSurface::NVGSurface(PluginEditor* e) : editor(e)
     
     setInterceptsMouseClicks(false, false);
     setWantsKeyboardFocus(false);
+
+    setSize(1,1);
     
     // Start rendering asynchronously, so we are sure the window has been added to the desktop
     // kind of a hack, but works well enough
@@ -103,6 +105,15 @@ NVGSurface::~NVGSurface()
     detachContext();
 }
 
+#ifdef LIN_OR_WIN
+void NVGSurface::timerCallback()
+{
+    updateBounds(newBounds);
+    if (getBounds() == newBounds)
+        stopTimer();
+}
+#endif
+
 
 void NVGSurface::triggerRepaint()
 {
@@ -145,6 +156,17 @@ float NVGSurface::getRenderScale() const
 #endif
 }
 
+void NVGSurface::updateBounds(Rectangle<int> bounds)
+{
+    newBounds = bounds;
+    if (hresize)
+        setBounds(bounds.withHeight(getHeight()));
+    else
+        setBounds(bounds.withWidth(getWidth()));
+
+    resizing = true;
+}
+
 void NVGSurface::resized()
 {
 #ifdef NANOVG_METAL_IMPLEMENTATION
@@ -266,6 +288,12 @@ void NVGSurface::render()
 
 #ifdef NANOVG_GL_IMPLEMENTATION
         glContext->swapBuffers();
+        if (resizing) {
+            hresize = !hresize;
+            resizing = false;
+        }
+        if (getBounds() != newBounds)
+            startTimerHz(60);
 #endif
         needsBufferSwap = false;
     }
diff --git a/Source/NVGSurface.h b/Source/NVGSurface.h
index e4592c996..a25ec48b4 100644
--- a/Source/NVGSurface.h
+++ b/Source/NVGSurface.h
@@ -22,7 +22,8 @@ public NSViewComponent
 #elif NANOVG_METAL_IMPLEMENTATION && JUCE_IOS
 public UIViewComponent
 #else
-public Component
+#define LIN_OR_WIN
+public Component, public Timer
 #endif
 {
 public:
@@ -34,8 +35,15 @@ public Component
         
     void detachContext();
     bool makeContextActive();
+
+#ifdef LIN_OR_WIN
+    void timerCallback() override;
+#endif
+
     
     float getRenderScale() const;
+
+    void updateBounds(Rectangle<int> bounds);
         
 private:
     
@@ -49,6 +57,10 @@ public Component
     NVGcontext* nvg = nullptr;
     bool needsBufferSwap = false;
     std::unique_ptr<VBlankAttachment> vBlankAttachment;
+
+    bool hresize = false;
+    bool resizing = false;
+    Rectangle<int> newBounds;
     
 #if NANOVG_GL_IMPLEMENTATION
     std::unique_ptr<OpenGLContext> glContext;
diff --git a/Source/PluginEditor.cpp b/Source/PluginEditor.cpp
index e51e0f88a..55b8e6bdb 100644
--- a/Source/PluginEditor.cpp
+++ b/Source/PluginEditor.cpp
@@ -491,7 +491,7 @@ void PluginEditor::resized()
     
     auto workArea = Rectangle<int>(paletteWidth, toolbarHeight, (getWidth() - sidebar->getWidth() - paletteWidth), workAreaHeight);
     splitView.setBounds(workArea);
-    nvgSurface.setBounds(workArea.withTrimmedTop(31));
+    nvgSurface.updateBounds(workArea.withTrimmedTop(31));
     
     sidebar->setBounds(getWidth() - sidebar->getWidth(), toolbarHeight, sidebar->getWidth(), workAreaHeight);