From 82c6911d7d25489bd810fbef89441e5d8ee5cfac Mon Sep 17 00:00:00 2001
From: Frank Richter <frank.richter@gmail.com>
Date: Mon, 9 Sep 2019 09:32:40 +0200
Subject: [PATCH] Windows QPA: Fix pixel format looping in describeFormats()

As per MSDN, pixel format indices are 1-based, not 0-based.

Change-Id: I6083144d3a95626e45bea21b50096b5f5f811c67
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
---
 src/plugins/platforms/windows/qwindowsglcontext.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/plugins/platforms/windows/qwindowsglcontext.cpp b/src/plugins/platforms/windows/qwindowsglcontext.cpp
index 101db75d0b1..dcdf9a56222 100644
--- a/src/plugins/platforms/windows/qwindowsglcontext.cpp
+++ b/src/plugins/platforms/windows/qwindowsglcontext.cpp
@@ -323,7 +323,7 @@ static inline bool
 static void describeFormats(HDC hdc)
 {
     const int pfiMax = DescribePixelFormat(hdc, 0, 0, nullptr);
-    for (int i = 0; i < pfiMax; i++) {
+    for (int i = 1; i <= pfiMax; i++) {
         PIXELFORMATDESCRIPTOR pfd;
         initPixelFormatDescriptor(&pfd);
         DescribePixelFormat(hdc, i, sizeof(PIXELFORMATDESCRIPTOR), &pfd);