From c3f1877fd111d9d708ef03470e6723d7ce2e24a1 Mon Sep 17 00:00:00 2001
From: Manolo Gouy <Manolo>
Date: Sun, 10 Apr 2016 18:22:57 +0000
Subject: Remove platform-dependent code from Fl_PNG_Image.cxx

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11574 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/drivers/WinAPI/Fl_WinAPI_System_Driver.cxx | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/drivers/WinAPI/Fl_WinAPI_System_Driver.cxx')

diff --git a/src/drivers/WinAPI/Fl_WinAPI_System_Driver.cxx b/src/drivers/WinAPI/Fl_WinAPI_System_Driver.cxx
index 9df5b2f71..529f9ade7 100644
--- a/src/drivers/WinAPI/Fl_WinAPI_System_Driver.cxx
+++ b/src/drivers/WinAPI/Fl_WinAPI_System_Driver.cxx
@@ -868,6 +868,14 @@ void *Fl_WinAPI_System_Driver::dlopen(const char *filename)
   return LoadLibrary(filename);
 }
 
+void Fl_WinAPI_System_Driver::png_extra_rgba_processing(unsigned char *ptr, int w, int h)
+{
+  // Some Windows graphics drivers don't honor transparency when RGB == white
+  // Convert RGB to 0 when alpha == 0...
+  for (int i = w * h; i > 0; i --, ptr += 4) {
+    if (!ptr[3]) ptr[0] = ptr[1] = ptr[2] = 0;
+  }
+}
 
 //
 // End of "$Id$".
-- 
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