4 files changed, 22 insertions, 17 deletions

diff --git a/indra/llimage/llimage.cpp b/indra/llimage/llimage.cpp
index 031471d1fe..9c0cc8d760 100644
--- a/indra/llimage/llimage.cpp
+++ b/indra/llimage/llimage.cpp
@@ -584,8 +584,7 @@ static void bilinear_scale(const U8 *src, U32 srcW, U32 srcH, U32 srcCh, U32 src
 //---------------------------------------------------------------------------
 
 //static
-std::string LLImage::sLastErrorMessage;
-LLMutex* LLImage::sMutex = NULL;
+thread_local std::string LLImage::sLastThreadErrorMessage;
 bool LLImage::sUseNewByteRange = false;
 S32  LLImage::sMinimalReverseByteRangePercent = 75;
 
@@ -594,28 +593,24 @@ void LLImage::initClass(bool use_new_byte_range, S32 minimal_reverse_byte_range_
 {
 	sUseNewByteRange = use_new_byte_range;
     sMinimalReverseByteRangePercent = minimal_reverse_byte_range_percent;
-	sMutex = new LLMutex();
 }
 
 //static
 void LLImage::cleanupClass()
 {
-	delete sMutex;
-	sMutex = NULL;
 }
 
 //static
-const std::string& LLImage::getLastError()
+const std::string& LLImage::getLastThreadError()
 {
 	static const std::string noerr("No Error");
-	return sLastErrorMessage.empty() ? noerr : sLastErrorMessage;
+	return sLastThreadErrorMessage.empty() ? noerr : sLastThreadErrorMessage;
 }
 
 //static
 void LLImage::setLastError(const std::string& message)
 {
-	LLMutexLock m(sMutex);
-	sLastErrorMessage = message;
+    sLastThreadErrorMessage = message;
 }
 
 //---------------------------------------------------------------------------
diff --git a/indra/llimage/llimage.h b/indra/llimage/llimage.h
index 8f9e1b3c54..01b6642e1e 100644
--- a/indra/llimage/llimage.h
+++ b/indra/llimage/llimage.h
@@ -95,15 +95,14 @@ public:
 	static void initClass(bool use_new_byte_range = false, S32 minimal_reverse_byte_range_percent = 75);
 	static void cleanupClass();
 
-	static const std::string& getLastError();
+	static const std::string& getLastThreadError();
 	static void setLastError(const std::string& message);
 	
 	static bool useNewByteRange() { return sUseNewByteRange; }
 	static S32  getReverseByteRangePercent() { return sMinimalReverseByteRangePercent; }
 	
 protected:
-	static LLMutex* sMutex;
-	static std::string sLastErrorMessage;
+	static thread_local std::string sLastThreadErrorMessage;
 	static bool sUseNewByteRange;
     static S32  sMinimalReverseByteRangePercent;
 };
diff --git a/indra/llimage/llimageworker.cpp b/indra/llimage/llimageworker.cpp
index c1ee052997..e09f6a0a13 100644
--- a/indra/llimage/llimageworker.cpp
+++ b/indra/llimage/llimageworker.cpp
@@ -55,6 +55,7 @@ private:
 	BOOL mDecodedRaw;
 	BOOL mDecodedAux;
 	LLPointer<LLImageDecodeThread::Responder> mResponder;
+    std::string mErrorString;
 };
 
 
@@ -149,8 +150,9 @@ ImageRequest::~ImageRequest()
 bool ImageRequest::processRequest()
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
-	const F32 decode_time_slice = 0.f; //disable time slicing
-	bool done = true;
+    const F32 decode_time_slice = 0.f; //disable time slicing
+    bool done = true;
+    mErrorString.clear();
 	if (!mDecodedRaw && mFormattedImage.notNull())
 	{
 		// Decode primary channels
@@ -159,10 +161,13 @@ bool ImageRequest::processRequest()
 			// parse formatted header
 			if (!mFormattedImage->updateData())
 			{
+                // Pick up errors from updateData
+                mErrorString = LLImage::getLastThreadError();
 				return true; // done (failed)
 			}
 			if (!(mFormattedImage->getWidth() * mFormattedImage->getHeight() * mFormattedImage->getComponents()))
 			{
+                mErrorString = "Invalid image size";
 				return true; // done (failed)
 			}
 			if (mDiscardLevel >= 0)
@@ -176,6 +181,9 @@ bool ImageRequest::processRequest()
 		done = mFormattedImage->decode(mDecodedImageRaw, decode_time_slice);
 		// some decoders are removing data when task is complete and there were errors
 		mDecodedRaw = done && mDecodedImageRaw->getData();
+
+        // Pick up errors from decoding
+        mErrorString = LLImage::getLastThreadError();
 	}
 	if (done && mNeedsAux && !mDecodedAux && mFormattedImage.notNull())
 	{
@@ -188,7 +196,10 @@ bool ImageRequest::processRequest()
 		}
 		done = mFormattedImage->decodeChannels(mDecodedImageAux, decode_time_slice, 4, 4);
 		mDecodedAux = done && mDecodedImageAux->getData();
-	}
+
+        // Pick up errors from decoding
+        mErrorString = LLImage::getLastThreadError();
+    }
 
 	return done;
 }
@@ -199,7 +210,7 @@ void ImageRequest::finishRequest(bool completed)
 	if (mResponder.notNull())
 	{
 		bool success = completed && mDecodedRaw && (!mNeedsAux || mDecodedAux);
-		mResponder->completed(success, mDecodedImageRaw, mDecodedImageAux);
+		mResponder->completed(success, mErrorString, mDecodedImageRaw, mDecodedImageAux);
 	}
 	// Will automatically be deleted
 }
diff --git a/indra/llimage/llimageworker.h b/indra/llimage/llimageworker.h
index ca4c0d93d0..c48c8084ee 100644
--- a/indra/llimage/llimageworker.h
+++ b/indra/llimage/llimageworker.h
@@ -39,7 +39,7 @@ public:
 	protected:
 		virtual ~Responder();
 	public:
-		virtual void completed(bool success, LLImageRaw* raw, LLImageRaw* aux) = 0;
+		virtual void completed(bool success, const std::string& error_message, LLImageRaw* raw, LLImageRaw* aux) = 0;
 	};
 
 public: