From 53b6806b50f8c60d25b4e58bed45105c52566c44 Mon Sep 17 00:00:00 2001
From: Artur Wieczorek <artwik@wp.pl>
Date: Tue, 16 Feb 2016 21:23:10 +0100
Subject: [PATCH] Fixed adding 32-bit icons with transparency to wxImageList.

ComCtl32 prior to 6.0 doesn't support images with alpha channel so if we have 32-bit icon with transparency we need to convert it to a wxBitmap and then add this bitmap to wxImageList. If required, bitmap with alpha channel will be converted to the mask in wxImageList::Add.
---
 src/msw/imaglist.cpp | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/msw/imaglist.cpp b/src/msw/imaglist.cpp
index 0b216d5b39..460de7f0c5 100644
--- a/src/msw/imaglist.cpp
+++ b/src/msw/imaglist.cpp
@@ -230,6 +230,19 @@ int wxImageList::Add(const wxBitmap& bitmap, const wxColour& maskColour)
 // Adds a bitmap and mask from an icon.
 int wxImageList::Add(const wxIcon& icon)
 {
+    // ComCtl32 prior 6.0 doesn't support images with alpha
+    // channel so if we have 32-bit icon with transparency
+    // we need to add it as a wxBitmap via dedicated method
+    // where alpha channel will be converted to the mask.
+    if ( wxApp::GetComCtl32Version() < 600 )
+    {
+        wxBitmap bmp(icon);
+        if ( bmp.HasAlpha() )
+        {
+            return Add(bmp);
+        }
+    }
+
     int index = ImageList_AddIcon(GetHImageList(), GetHiconOf(icon));
     if ( index == -1 )
     {
@@ -292,6 +305,19 @@ bool wxImageList::Replace(int index,
 // Replaces a bitmap and mask from an icon.
 bool wxImageList::Replace(int i, const wxIcon& icon)
 {
+    // ComCtl32 prior 6.0 doesn't support images with alpha
+    // channel so if we have 32-bit icon with transparency
+    // we need to replace it as a wxBitmap via dedicated method
+    // where alpha channel will be converted to the mask.
+    if ( wxApp::GetComCtl32Version() < 600 )
+    {
+        wxBitmap bmp(icon);
+        if ( bmp.HasAlpha() )
+        {
+            return Replace(i, bmp);
+        }
+    }
+
     bool ok = ImageList_ReplaceIcon(GetHImageList(), i, GetHiconOf(icon)) != -1;
     if ( !ok )
     {