fix for MAINT-2147: crash in LLTextureCache::writeToFastCache on OSX

2 files changed, 14 insertions, 1 deletions

diff --git a/indra/llimage/llimage.cpp b/indra/llimage/llimage.cpp
index a88ac148ef..3f8d1baddd 100644
--- a/indra/llimage/llimage.cpp
+++ b/indra/llimage/llimage.cpp
@@ -666,8 +666,17 @@ void LLImageRaw::fill( const LLColor4U& color )
 	}
 }
 
+LLPointer<LLImageRaw> LLImageRaw::duplicate()
+{
+	if(getNumRefs() < 2)
+	{
+		return this; //nobody else refences to this image, no need to duplicate.
+	}
 
-
+	//make a duplicate
+	LLPointer<LLImageRaw> dup = new LLImageRaw(getData(), getWidth(), getHeight(), getComponents());
+	return dup; 
+}
 
 // Src and dst can be any size.  Src and dst can each have 3 or 4 components.
 void LLImageRaw::copy(LLImageRaw* src)
diff --git a/indra/llimage/llimage.h b/indra/llimage/llimage.h
index 6cb1226da0..1d56411ae8 100644
--- a/indra/llimage/llimage.h
+++ b/indra/llimage/llimage.h
@@ -30,6 +30,7 @@
 #include "lluuid.h"
 #include "llstring.h"
 #include "llthread.h"
+#include "llpointer.h"
 
 const S32 MIN_IMAGE_MIP =  2; // 4x4, only used for expand/contract power of 2
 const S32 MAX_IMAGE_MIP = 11; // 2048x2048
@@ -214,6 +215,9 @@ public:
 
 	// Copy operations
 	
+	//duplicate this raw image if refCount > 1.
+	LLPointer<LLImageRaw> duplicate();
+
 	// Src and dst can be any size.  Src and dst can each have 3 or 4 components.
 	void copy( LLImageRaw* src );