1 files changed, 39 insertions, 30 deletions

diff --git a/indra/llimage/llimagej2c.cpp b/indra/llimage/llimagej2c.cpp
index 5175849ad8..42f3e92257 100644
--- a/indra/llimage/llimagej2c.cpp
+++ b/indra/llimage/llimagej2c.cpp
@@ -107,6 +107,8 @@ bool LLImageJ2C::updateData()
     bool res = true;
     resetLastError();
 
+    LLImageDataLock lock(this);
+
     // Check to make sure that this instance has been initialized with data
     if (!getData() || (getDataSize() < 16))
     {
@@ -157,22 +159,25 @@ bool LLImageJ2C::decodeChannels(LLImageRaw *raw_imagep, F32 decode_time, S32 fir
     LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
     LLTimer elapsed;
 
-    bool res = true;
-
     resetLastError();
 
-    // Check to make sure that this instance has been initialized with data
-    if (!getData() || (getDataSize() < 16))
-    {
-        setLastError("LLImageJ2C uninitialized");
-        res = true; // done
-    }
-    else
+    bool res;
     {
-        // Update the raw discard level
-        updateRawDiscardLevel();
+        LLImageDataLock lock(this);
+
         mDecoding = true;
-        res = mImpl->decodeImpl(*this, *raw_imagep, decode_time, first_channel, max_channel_count);
+        // Check to make sure that this instance has been initialized with data
+        if (!getData() || (getDataSize() < 16))
+        {
+            setLastError("LLImageJ2C uninitialized");
+            res = true; // done
+        }
+        else
+        {
+            // Update the raw discard level
+            updateRawDiscardLevel();
+            res = mImpl->decodeImpl(*this, *raw_imagep, decode_time, first_channel, max_channel_count);
+        }
     }
 
     if (res)
@@ -181,12 +186,21 @@ bool LLImageJ2C::decodeChannels(LLImageRaw *raw_imagep, F32 decode_time, S32 fir
         {
             // Failed
             raw_imagep->deleteData();
+            res = false;
         }
         else
         {
             mDecoding = false;
         }
     }
+    else
+    {
+        if (mDecoding)
+        {
+            LL_WARNS() << "decodeImpl failed but mDecoding is true" << LL_ENDL;
+            mDecoding = false;
+        }
+    }
 
     if (!mLastError.empty())
     {
@@ -261,30 +275,24 @@ S32 LLImageJ2C::calcDataSizeJ2C(S32 w, S32 h, S32 comp, S32 discard_level, F32 r
     // For details about the equation used here, see https://wiki.lindenlab.com/wiki/THX1138_KDU_Improvements#Byte_Range_Study
 
     // Estimate the number of layers. This is consistent with what's done for j2c encoding in LLImageJ2CKDU::encodeImpl().
+    constexpr S32 precision = 8; // assumed bitrate per component channel, might change in future for HDR support
+    constexpr S32 max_components = 4; // assumed the file has four components; three color and alpha
     S32 nb_layers = 1;
-    S32 surface = w*h;
+    const S32 surface = w*h;
     S32 s = 64*64;
+    S32 totalbytes = (S32)(s * max_components * precision * rate); // first level computed before loop
     while (surface > s)
     {
+        if (nb_layers <= (5 - discard_level))
+            totalbytes += (S32)(s * max_components * precision * rate);
         nb_layers++;
         s *= 4;
     }
-    F32 layer_factor =  3.0f * (7 - llclamp(nb_layers,1,6));
-
-    // Compute w/pow(2,discard_level) and h/pow(2,discard_level)
-    w >>= discard_level;
-    h >>= discard_level;
-    w = llmax(w, 1);
-    h = llmax(h, 1);
-
-    // Temporary: compute both new and old range and pick one according to the settings TextureNewByteRange
-    // *TODO: Take the old code out once we have enough tests done
-    S32 bytes;
-    S32 new_bytes = (S32) (sqrt((F32)(w*h))*(F32)(comp)*rate*1000.f/layer_factor);
-    S32 old_bytes = (S32)((F32)(w*h*comp)*rate);
-    bytes = (LLImage::useNewByteRange() && (new_bytes < old_bytes) ? new_bytes : old_bytes);
-    bytes = llmax(bytes, calcHeaderSizeJ2C());
-    return bytes;
+
+    totalbytes /= 8; // to bytes
+    totalbytes += calcHeaderSizeJ2C();  // header
+
+    return totalbytes;
 }
 
 S32 LLImageJ2C::calcHeaderSize()
@@ -406,9 +414,10 @@ bool LLImageJ2C::loadAndValidate(const std::string &filename)
 
 bool LLImageJ2C::validate(U8 *data, U32 file_size)
 {
-
     resetLastError();
 
+    LLImageDataLock lock(this);
+
     setData(data, file_size);
 
     bool res = updateData();