From eaed0036efe04cfaa50218f7041078972427dffb Mon Sep 17 00:00:00 2001
From: Mikhail Pozdnyakov <mikhail.pozdnyakov@mapbox.com>
Date: Tue, 9 Jul 2019 16:29:30 +0300
Subject: [glfw] Reduce memory use when window loses focus

---
 platform/glfw/glfw_view.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'platform/glfw/glfw_view.cpp')

diff --git a/platform/glfw/glfw_view.cpp b/platform/glfw/glfw_view.cpp
index 41c3e93b35..43c4de9759 100644
--- a/platform/glfw/glfw_view.cpp
+++ b/platform/glfw/glfw_view.cpp
@@ -102,6 +102,7 @@ GLFWView::GLFWView(bool fullscreen_, bool benchmark_)
     glfwSetFramebufferSizeCallback(window, onFramebufferResize);
     glfwSetScrollCallback(window, onScroll);
     glfwSetKeyCallback(window, onKey);
+    glfwSetWindowFocusCallback(window, onWindowFocus);
 
     glfwGetWindowSize(window, &width, &height);
 
@@ -559,6 +560,13 @@ void GLFWView::onMouseMove(GLFWwindow *window, double x, double y) {
     view->lastY = y;
 }
 
+void GLFWView::onWindowFocus(GLFWwindow *window, int focused) {
+    if (focused == GLFW_FALSE) { // Focus lost.
+        auto *view = reinterpret_cast<GLFWView *>(glfwGetWindowUserPointer(window));
+        view->rendererFrontend->getRenderer()->reduceMemoryUse();
+    }
+}
+
 void GLFWView::run() {
     auto callback = [&] {
         if (glfwWindowShouldClose(window)) {
-- 
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