From 1ed4d50a95654df453f6d1adf042786bbcc75591 Mon Sep 17 00:00:00 2001
From: Pierre Ossman <ossman@cendio.se>
Date: Tue, 7 Jan 2014 15:28:45 +0000
Subject: Make sure the fill function pointer gets updated if the managed pixel
 buffer changes format. Also add a bit more protection for switching pixel
 format as the base classes aren't really designed for that. Fixes a crash
 with the mouse pointer in WinVNC. Based on work done by Daniel Wyatt
 (dewyatt).

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@5152 3789f03b-4d11-0410-bbf8-ca57d06f2519
---
 common/rfb/PixelBuffer.cxx | 22 +++++++++++++++++-----
 common/rfb/PixelBuffer.h   |  7 +++++++
 2 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/common/rfb/PixelBuffer.cxx b/common/rfb/PixelBuffer.cxx
index 106b42bc..60957a25 100644
--- a/common/rfb/PixelBuffer.cxx
+++ b/common/rfb/PixelBuffer.cxx
@@ -133,6 +133,22 @@ FullFramePixelBuffer::FullFramePixelBuffer(const PixelFormat& pf, int w, int h,
                                            rdr::U8* data_, ColourMap* cm)
   : PixelBuffer(pf, w, h, cm), data(data_)
 {
+  // Called again to configure the fill function
+  setPF(pf);
+}
+
+FullFramePixelBuffer::FullFramePixelBuffer() : data(0) {}
+
+FullFramePixelBuffer::~FullFramePixelBuffer() {}
+
+
+void FullFramePixelBuffer::setPF(const PixelFormat &pf) {
+  // We have this as a separate method for ManagedPixelBuffer's
+  // sake. Direct users of FullFramePixelBuffer aren't allowed
+  // to call it.
+
+  PixelBuffer::setPF(pf);
+
   switch(pf.bpp) {
   case 8:
     fillRectFn = fillRect8;
@@ -148,10 +164,6 @@ FullFramePixelBuffer::FullFramePixelBuffer(const PixelFormat& pf, int w, int h,
   }
 }
 
-FullFramePixelBuffer::FullFramePixelBuffer() : data(0) {}
-
-FullFramePixelBuffer::~FullFramePixelBuffer() {}
-
 
 int FullFramePixelBuffer::getStride() const { return width(); }
 
@@ -334,7 +346,7 @@ ManagedPixelBuffer::~ManagedPixelBuffer() {
 
 void
 ManagedPixelBuffer::setPF(const PixelFormat &pf) {
-  format = pf; checkDataSize();
+  FullFramePixelBuffer::setPF(pf); checkDataSize();
 };
 void
 ManagedPixelBuffer::setSize(int w, int h) {
diff --git a/common/rfb/PixelBuffer.h b/common/rfb/PixelBuffer.h
index d721fa29..e870622e 100644
--- a/common/rfb/PixelBuffer.h
+++ b/common/rfb/PixelBuffer.h
@@ -44,7 +44,10 @@ namespace rfb {
     //
 
     // Set/get pixel format & colourmap
+  protected:
+    // Only for subclasses that support changing parameters
     virtual void setPF(const PixelFormat &pf);
+  public:
     virtual const PixelFormat &getPF() const;
     virtual ColourMap* getColourMap() const;
 
@@ -103,6 +106,10 @@ namespace rfb {
                          rdr::U8* data_, ColourMap* cm);
     virtual ~FullFramePixelBuffer();
 
+  protected:
+    virtual void setPF(const PixelFormat &pf);
+
+  public:
     // - Get the number of pixels per row in the actual pixel buffer data area
     //   This may in some cases NOT be the same as width().
     virtual int getStride() const;
-- 
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