Force order, Premultiply alpha after alpha mask.
[platform/core/uifw/dali-toolkit.git] / dali-toolkit / internal / visuals / texture-manager-impl.cpp
index 7f62d22..6dcc2fc 100644 (file)
@@ -1,5 +1,5 @@
  /*
- * Copyright (c) 2017 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -79,11 +79,22 @@ namespace
 
 #ifdef DEBUG_ENABLED
 Debug::Filter* gTextureManagerLogFilter = Debug::Filter::New( Debug::NoLogging, false, "LOG_TEXTURE_MANAGER" );
+
+#define GET_LOAD_STATE_STRING( loadState ) \
+  loadState == TextureManager::NOT_STARTED ? "NOT_STARTED" :             \
+    loadState == TextureManager::LOADING ? "LOADING" :                   \
+    loadState == TextureManager::LOAD_FINISHED ? "LOAD_FINISHED" :       \
+    loadState == TextureManager::WAITING_FOR_MASK ? "WAITING_FOR_MASK" : \
+    loadState == TextureManager::MASK_APPLYING ? "MASK_APPLYING" :         \
+    loadState == TextureManager::MASK_APPLIED ? "MASK_APPLIED" :         \
+    loadState == TextureManager::UPLOADED ? "UPLOADED" :                 \
+    loadState == TextureManager::CANCELLED ? "CANCELLED" :               \
+    loadState == TextureManager::LOAD_FAILED ? "LOAD_FAILED" : "Unknown"
+
 #endif
 
 const uint32_t      DEFAULT_ATLAS_SIZE( 1024u );                     ///< This size can fit 8 by 8 images of average size 128 * 128
 const Vector4       FULL_ATLAS_RECT( 0.0f, 0.0f, 1.0f, 1.0f );       ///< UV Rectangle that covers the full Texture
-const char * const  BROKEN_IMAGE_URL( DALI_IMAGE_DIR "broken.png" ); ///< URL For the broken image placeholder
 const int           INVALID_INDEX( -1 );                             ///< Invalid index used to represent a non-existant TextureInfo struct
 const int           INVALID_CACHE_INDEX( -1 ); ///< Invalid Cache index
 
@@ -116,18 +127,31 @@ TextureManager::MaskingData::MaskingData()
 TextureManager::TextureManager()
 : mAsyncLocalLoaders( GetNumberOfLocalLoaderThreads(), [&]() { return AsyncLoadingHelper(*this); } ),
   mAsyncRemoteLoaders( GetNumberOfRemoteLoaderThreads(), [&]() { return AsyncLoadingHelper(*this); } ),
-  mCurrentTextureId( 0 )
+  mExternalTextures(),
+  mLifecycleObservers(),
+  mLoadQueue(),
+  mBrokenImageUrl(""),
+  mCurrentTextureId( 0 ),
+  mQueueLoadFlag(false)
 {
 }
 
+TextureManager::~TextureManager()
+{
+  for( auto iter = mLifecycleObservers.Begin(), endIter = mLifecycleObservers.End(); iter != endIter; ++iter)
+  {
+    (*iter)->TextureManagerDestroyed();
+  }
+}
+
 TextureSet TextureManager::LoadTexture(
-    const VisualUrl& url, Dali::ImageDimensions desiredSize, Dali::FittingMode::Type fittingMode,
-    Dali::SamplingMode::Type samplingMode, const MaskingDataPointer& maskInfo,
-    bool synchronousLoading, TextureManager::TextureId& textureId, Vector4& textureRect,
-    bool& atlasingStatus, bool& loadingStatus, Dali::WrapMode::Type wrapModeU,
-    Dali::WrapMode::Type wrapModeV, TextureUploadObserver* textureObserver,
-    AtlasUploadObserver* atlasObserver, ImageAtlasManagerPtr imageAtlasManager, bool orientationCorrection,
-    TextureManager::ReloadPolicy reloadPolicy, TextureManager::MultiplyOnLoad& preMultiplyOnLoad )
+  const VisualUrl& url, Dali::ImageDimensions desiredSize, Dali::FittingMode::Type fittingMode,
+  Dali::SamplingMode::Type samplingMode, const MaskingDataPointer& maskInfo,
+  bool synchronousLoading, TextureManager::TextureId& textureId, Vector4& textureRect,
+  Dali::ImageDimensions& textureRectSize, bool& atlasingStatus, bool& loadingStatus,
+  Dali::WrapMode::Type wrapModeU, Dali::WrapMode::Type wrapModeV, TextureUploadObserver* textureObserver,
+  AtlasUploadObserver* atlasObserver, ImageAtlasManagerPtr imageAtlasManager, bool orientationCorrection,
+  TextureManager::ReloadPolicy reloadPolicy, TextureManager::MultiplyOnLoad& preMultiplyOnLoad )
 {
   TextureSet textureSet;
 
@@ -144,6 +168,7 @@ TextureSet TextureManager::LoadTexture(
       {
         if( elem.textureId == id )
         {
+          preMultiplyOnLoad = TextureManager::MultiplyOnLoad::LOAD_WITHOUT_MULTIPLY;
           textureId = elem.textureId;
           return elem.textureSet;
         }
@@ -167,7 +192,7 @@ TextureSet TextureManager::LoadTexture(
     {
       // use broken image
       textureSet = TextureSet::New();
-      Devel::PixelBuffer pixelBuffer = LoadImageFromFile( BROKEN_IMAGE_URL );
+      Devel::PixelBuffer pixelBuffer = LoadImageFromFile( mBrokenImageUrl );
       if( pixelBuffer )
       {
         PreMultiply( pixelBuffer, preMultiplyOnLoad );
@@ -194,6 +219,11 @@ TextureSet TextureManager::LoadTexture(
         textureSet = TextureSet::New();
         textureSet.SetTexture( 0u, texture );
       }
+      else
+      {
+        textureRectSize.SetWidth(data.GetWidth());
+        textureRectSize.SetHeight(data.GetHeight());
+      }
     }
   }
   else
@@ -201,7 +231,7 @@ TextureSet TextureManager::LoadTexture(
     loadingStatus = true;
     if( atlasingStatus )
     {
-      textureSet = imageAtlasManager->Add( textureRect, url.GetUrl(), desiredSize, fittingMode, true, atlasObserver );
+      textureSet = imageAtlasManager->Add( textureRect, url.GetUrl(), desiredSize, fittingMode, true, atlasObserver);
     }
     if( !textureSet ) // big image, no atlasing or atlasing failed
     {
@@ -226,13 +256,25 @@ TextureSet TextureManager::LoadTexture(
       }
 
       TextureManager::LoadState loadState = GetTextureStateInternal( textureId );
-      loadingStatus = ( loadState == TextureManager::LOADING );
-
       if( loadState == TextureManager::UPLOADED )
       {
         // UploadComplete has already been called - keep the same texture set
         textureSet = GetTextureSet( textureId );
       }
+
+      // If we are loading the texture, or waiting for the ready signal handler to complete, inform
+      // caller that they need to wait.
+      loadingStatus = ( loadState == TextureManager::LOADING ||
+                        loadState == TextureManager::WAITING_FOR_MASK ||
+                        loadState == TextureManager::MASK_APPLYING ||
+                        loadState == TextureManager::MASK_APPLIED ||
+                        loadState == TextureManager::NOT_STARTED ||
+                        mQueueLoadFlag );
+
+    }
+    else
+    {
+      textureRectSize = desiredSize;
     }
   }
 
@@ -307,7 +349,7 @@ TextureManager::TextureId TextureManager::RequestLoadInternal(
 {
   // First check if the requested Texture is cached.
   const TextureHash textureHash = GenerateHash( url.GetUrl(), desiredSize, fittingMode, samplingMode, useAtlas,
-                                                maskTextureId, preMultiplyOnLoad );
+                                                maskTextureId );
 
   TextureManager::TextureId textureId = INVALID_TEXTURE_ID;
 
@@ -325,7 +367,11 @@ TextureManager::TextureId TextureManager::RequestLoadInternal(
       ++( mTextureInfoContainer[ cacheIndex ].referenceCount );
     }
     textureId = mTextureInfoContainer[ cacheIndex ].textureId;
-    DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Concise, "TextureManager::RequestLoad( url=%s observer=%p ) Using cached texture id@%d, textureId=%d\n",
+
+    // Update preMultiplyOnLoad value. It should be changed according to preMultiplied value of the cached info.
+    preMultiplyOnLoad = mTextureInfoContainer[ cacheIndex ].preMultiplied ? TextureManager::MultiplyOnLoad::MULTIPLY_ON_LOAD : TextureManager::MultiplyOnLoad::LOAD_WITHOUT_MULTIPLY;
+
+    DALI_LOG_INFO( gTextureManagerLogFilter, Debug::General, "TextureManager::RequestLoad( url=%s observer=%p ) Using cached texture id@%d, textureId=%d\n",
                    url.GetUrl().c_str(), observer, cacheIndex, textureId );
   }
 
@@ -340,7 +386,7 @@ TextureManager::TextureId TextureManager::RequestLoadInternal(
                                                   preMultiply ) );
     cacheIndex = mTextureInfoContainer.size() - 1u;
 
-    DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Concise, "TextureManager::RequestLoad( url=%s observer=%p ) New texture, cacheIndex:%d, textureId=%d\n",
+    DALI_LOG_INFO( gTextureManagerLogFilter, Debug::General, "TextureManager::RequestLoad( url=%s observer=%p ) New texture, cacheIndex:%d, textureId=%d\n",
                    url.GetUrl().c_str(), observer, cacheIndex, textureId );
   }
 
@@ -352,14 +398,15 @@ TextureManager::TextureId TextureManager::RequestLoadInternal(
   textureInfo.storageType = storageType;
   textureInfo.orientationCorrection = orientationCorrection;
 
-  DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Concise, "TextureInfo loadState:%s\n",
-                 textureInfo.loadState == TextureManager::NOT_STARTED ? "NOT_STARTED" :
-                 textureInfo.loadState == TextureManager::LOADING ? "LOADING" :
-                 textureInfo.loadState == TextureManager::UPLOADED ? "UPLOADED" :
-                 textureInfo.loadState == TextureManager::CANCELLED ? "CANCELLED" : "Unknown" );
+  DALI_LOG_INFO( gTextureManagerLogFilter, Debug::General, "TextureInfo loadState:%s\n",
+                 GET_LOAD_STATE_STRING(textureInfo.loadState ) );
 
   // Force reloading of texture by setting loadState unless already loading or cancelled.
-  if ( TextureManager::ReloadPolicy::FORCED == reloadPolicy && TextureManager::LOADING != textureInfo.loadState &&
+  if ( TextureManager::ReloadPolicy::FORCED == reloadPolicy &&
+       TextureManager::LOADING != textureInfo.loadState &&
+       TextureManager::WAITING_FOR_MASK != textureInfo.loadState &&
+       TextureManager::MASK_APPLYING != textureInfo.loadState &&
+       TextureManager::MASK_APPLIED != textureInfo.loadState &&
        TextureManager::CANCELLED != textureInfo.loadState )
   {
     DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Verbose, "TextureManager::RequestLoad( url=%s observer=%p ) ForcedReload cacheIndex:%d, textureId=%d\n",
@@ -374,11 +421,13 @@ TextureManager::TextureId TextureManager::RequestLoadInternal(
     case TextureManager::LOAD_FAILED: // Failed notifies observer which then stops observing.
     case TextureManager::NOT_STARTED:
     {
-      LoadTexture( textureInfo );
-      ObserveTexture( textureInfo, observer );
+      LoadOrQueueTexture( textureInfo, observer ); // If called inside NotifyObservers, queues until afterwards
       break;
     }
     case TextureManager::LOADING:
+    case TextureManager::WAITING_FOR_MASK:
+    case TextureManager::MASK_APPLYING:
+    case TextureManager::MASK_APPLIED:
     {
       ObserveTexture( textureInfo, observer );
       break;
@@ -387,11 +436,7 @@ TextureManager::TextureId TextureManager::RequestLoadInternal(
     {
       if( observer )
       {
-        // The Texture has already loaded. The other observers have already been notified.
-        // We need to send a "late" loaded notification for this observer.
-        observer->UploadComplete( true, textureInfo.textureId, textureInfo.textureSet,
-                                  textureInfo.useAtlas, textureInfo.atlasRect,
-                                  textureInfo.preMultiplied );
+        LoadOrQueueTexture( textureInfo, observer );
       }
       break;
     }
@@ -404,7 +449,6 @@ TextureManager::TextureId TextureManager::RequestLoadInternal(
       break;
     }
     case TextureManager::LOAD_FINISHED:
-    case TextureManager::WAITING_FOR_MASK:
       // Loading has already completed. Do nothing.
       break;
   }
@@ -420,12 +464,10 @@ void TextureManager::Remove( const TextureManager::TextureId textureId )
   {
     TextureInfo& textureInfo( mTextureInfoContainer[ textureInfoIndex ] );
 
-    DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Concise, "TextureManager::Remove(%d) cacheIdx:%d loadState:%s\n",
-                   textureId, textureInfoIndex,
-                   textureInfo.loadState == TextureManager::NOT_STARTED ? "NOT_STARTED" :
-                   textureInfo.loadState == TextureManager::LOADING ? "LOADING" :
-                   textureInfo.loadState == TextureManager::UPLOADED ? "UPLOADED" :
-                   textureInfo.loadState == TextureManager::CANCELLED ? "CANCELLED" : "Unknown" );
+    DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Concise,
+                   "TextureManager::Remove(%d) url:%s\n  cacheIdx:%d loadState:%s\n",
+                   textureId, textureInfo.url.GetUrl().c_str(),
+                   textureInfoIndex, GET_LOAD_STATE_STRING( textureInfo.loadState ) );
 
     // Decrement the reference count and check if this is the last user of this Texture.
     if( --textureInfo.referenceCount <= 0 )
@@ -465,13 +507,20 @@ void TextureManager::Remove( const TextureManager::TextureId textureId )
   }
 }
 
-const VisualUrl& TextureManager::GetVisualUrl( TextureId textureId )
+VisualUrl TextureManager::GetVisualUrl( TextureId textureId )
 {
+  VisualUrl visualUrl("");
   int cacheIndex = GetCacheIndexFromId( textureId );
-  DALI_ASSERT_DEBUG( cacheIndex != INVALID_CACHE_INDEX && "TextureId out of range");
 
-  TextureInfo& cachedTextureInfo( mTextureInfoContainer[ cacheIndex ] );
-  return cachedTextureInfo.url;
+  if( cacheIndex != INVALID_CACHE_INDEX )
+  {
+    DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Concise, "TextureManager::GetVisualUrl. Using cached texture id=%d, textureId=%d\n",
+                   cacheIndex, textureId );
+
+    TextureInfo& cachedTextureInfo( mTextureInfoContainer[ cacheIndex ] );
+    visualUrl = cachedTextureInfo.url;
+  }
+  return visualUrl;
 }
 
 TextureManager::LoadState TextureManager::GetTextureState( TextureId textureId )
@@ -573,31 +622,131 @@ TextureSet TextureManager::RemoveExternalTexture( const std::string& url )
   return TextureSet();
 }
 
-bool TextureManager::LoadTexture( TextureInfo& textureInfo )
+
+void TextureManager::AddObserver( TextureManager::LifecycleObserver& observer )
 {
-  bool success = true;
+  // make sure an observer doesn't observe the same object twice
+  // otherwise it will get multiple calls to ObjectDestroyed()
+  DALI_ASSERT_DEBUG( mLifecycleObservers.End() == std::find( mLifecycleObservers.Begin(), mLifecycleObservers.End(), &observer));
+  mLifecycleObservers.PushBack( &observer );
+}
 
-  if( textureInfo.loadState == NOT_STARTED )
+void TextureManager::RemoveObserver( TextureManager::LifecycleObserver& observer)
+{
+  // Find the observer...
+  auto endIter =  mLifecycleObservers.End();
+  for( auto iter = mLifecycleObservers.Begin(); iter != endIter; ++iter)
   {
-    textureInfo.loadState = LOADING;
+    if( (*iter) == &observer)
+    {
+      mLifecycleObservers.Erase( iter );
+      break;
+    }
+  }
+  DALI_ASSERT_DEBUG(endIter != mLifecycleObservers.End());
+}
 
-    if( !textureInfo.loadSynchronously )
+void TextureManager::LoadOrQueueTexture( TextureInfo& textureInfo, TextureUploadObserver* observer )
+{
+  switch( textureInfo.loadState )
+  {
+    case NOT_STARTED:
+    case LOAD_FAILED:
+    {
+      if( mQueueLoadFlag )
+      {
+        QueueLoadTexture( textureInfo, observer );
+      }
+      else
+      {
+        LoadTexture( textureInfo, observer );
+      }
+      break;
+    }
+    case UPLOADED:
+    {
+      if( mQueueLoadFlag )
+      {
+        QueueLoadTexture( textureInfo, observer );
+      }
+      else
+      {
+        // The Texture has already loaded. The other observers have already been notified.
+        // We need to send a "late" loaded notification for this observer.
+        observer->UploadComplete( true, textureInfo.textureId, textureInfo.textureSet,
+                                  textureInfo.useAtlas, textureInfo.atlasRect,
+                                  textureInfo.preMultiplied );
+      }
+      break;
+    }
+    case LOADING:
+    case CANCELLED:
+    case LOAD_FINISHED:
+    case WAITING_FOR_MASK:
+    case MASK_APPLYING:
+    case MASK_APPLIED:
     {
-      auto& loadersContainer = textureInfo.url.IsLocalResource() ? mAsyncLocalLoaders : mAsyncRemoteLoaders;
-      auto loadingHelperIt = loadersContainer.GetNext();
-      DALI_ASSERT_ALWAYS(loadingHelperIt != loadersContainer.End());
-      loadingHelperIt->Load(textureInfo.textureId, textureInfo.url,
-                            textureInfo.desiredSize, textureInfo.fittingMode,
-                            textureInfo.samplingMode, textureInfo.orientationCorrection );
+      break;
     }
   }
+}
+
+void TextureManager::QueueLoadTexture( TextureInfo& textureInfo, TextureUploadObserver* observer )
+{
+  auto textureId = textureInfo.textureId;
+  mLoadQueue.PushBack( LoadQueueElement( textureId, observer) );
+}
+
+void TextureManager::LoadTexture( TextureInfo& textureInfo, TextureUploadObserver* observer )
+{
+  DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Concise, "TextureManager::LoadTexture(): url:%s sync:%s\n",
+                 textureInfo.url.GetUrl().c_str(), textureInfo.loadSynchronously?"T":"F" );
+
+  textureInfo.loadState = LOADING;
+  if( !textureInfo.loadSynchronously )
+  {
+    auto& loadersContainer = textureInfo.url.IsLocalResource() ? mAsyncLocalLoaders : mAsyncRemoteLoaders;
+    auto loadingHelperIt = loadersContainer.GetNext();
+    auto premultiplyOnLoad = ( textureInfo.preMultiplyOnLoad && textureInfo.maskTextureId == INVALID_TEXTURE_ID ) ?
+                               DevelAsyncImageLoader::PreMultiplyOnLoad::ON : DevelAsyncImageLoader::PreMultiplyOnLoad::OFF;
+    DALI_ASSERT_ALWAYS(loadingHelperIt != loadersContainer.End());
+    loadingHelperIt->Load(textureInfo.textureId, textureInfo.url,
+                          textureInfo.desiredSize, textureInfo.fittingMode,
+                          textureInfo.samplingMode, textureInfo.orientationCorrection,
+                          premultiplyOnLoad );
+  }
+  ObserveTexture( textureInfo, observer );
+}
 
-  return success;
+void TextureManager::ProcessQueuedTextures()
+{
+  for( auto&& element : mLoadQueue )
+  {
+    int cacheIndex = GetCacheIndexFromId( element.mTextureId );
+    if( cacheIndex != INVALID_CACHE_INDEX )
+    {
+      TextureInfo& textureInfo( mTextureInfoContainer[cacheIndex] );
+      if( textureInfo.loadState == UPLOADED )
+      {
+        element.mObserver->UploadComplete( true, textureInfo.textureId, textureInfo.textureSet,
+                                           textureInfo.useAtlas, textureInfo.atlasRect,
+                                           textureInfo.preMultiplied );
+      }
+      else
+      {
+        LoadTexture( textureInfo, element.mObserver );
+      }
+    }
+  }
+  mLoadQueue.Clear();
 }
 
 void TextureManager::ObserveTexture( TextureInfo& textureInfo,
                                      TextureUploadObserver* observer )
 {
+  DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Concise, "TextureManager::ObserveTexture(): url:%s observer:%p\n",
+                 textureInfo.url.GetUrl().c_str(), observer );
+
   if( observer )
   {
     textureInfo.observerList.PushBack( observer );
@@ -621,7 +770,9 @@ void TextureManager::AsyncLoadComplete( AsyncLoadingInfoContainerType& loadingCo
       {
         TextureInfo& textureInfo( mTextureInfoContainer[cacheIndex] );
 
-        DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Concise, "  CacheIndex:%d LoadState: %d\n", cacheIndex, textureInfo.loadState );
+        DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Concise,
+                       "  textureId:%d Url:%s CacheIndex:%d LoadState: %d\n",
+                       textureInfo.textureId, textureInfo.url.GetUrl().c_str(), cacheIndex, textureInfo.loadState );
 
         if( textureInfo.loadState != CANCELLED )
         {
@@ -654,18 +805,26 @@ void TextureManager::PostLoad( TextureInfo& textureInfo, Devel::PixelBuffer& pix
       // wait for the mask to finish loading.
       if( textureInfo.maskTextureId != INVALID_TEXTURE_ID )
       {
-        LoadState maskLoadState = GetTextureStateInternal( textureInfo.maskTextureId );
-        if( maskLoadState == LOADING )
-        {
-          textureInfo.pixelBuffer = pixelBuffer; // Store the pixel buffer temporarily
-          textureInfo.loadState = WAITING_FOR_MASK;
-        }
-        else if( maskLoadState == LOAD_FINISHED )
+        if( textureInfo.loadState == MASK_APPLYING )
         {
-          ApplyMask( pixelBuffer, textureInfo.maskTextureId, textureInfo.scaleFactor, textureInfo.cropToMask );
+          textureInfo.loadState = MASK_APPLIED;
           UploadTexture( pixelBuffer, textureInfo );
           NotifyObservers( textureInfo, true );
         }
+        else
+        {
+          LoadState maskLoadState = GetTextureStateInternal( textureInfo.maskTextureId );
+          textureInfo.pixelBuffer = pixelBuffer; // Store the pixel buffer temporarily
+          if( maskLoadState == LOADING )
+          {
+            textureInfo.loadState = WAITING_FOR_MASK;
+          }
+          else if( maskLoadState == LOAD_FINISHED )
+          {
+            // Send New Task to Thread
+            ApplyMask( textureInfo, textureInfo.maskTextureId );
+          }
+        }
       }
       else
       {
@@ -685,7 +844,6 @@ void TextureManager::PostLoad( TextureInfo& textureInfo, Devel::PixelBuffer& pix
   }
   else
   {
-    DALI_LOG_ERROR( "TextureManager::AsyncImageLoad(%s) failed\n", textureInfo.url.GetUrl().c_str() );
     // @todo If the load was unsuccessful, upload the broken image.
     textureInfo.loadState = LOAD_FAILED;
     CheckForWaitingTexture( textureInfo );
@@ -705,18 +863,15 @@ void TextureManager::CheckForWaitingTexture( TextureInfo& maskTextureInfo )
         mTextureInfoContainer[cacheIndex].loadState == WAITING_FOR_MASK )
     {
       TextureInfo& textureInfo( mTextureInfoContainer[cacheIndex] );
-      Devel::PixelBuffer pixelBuffer = textureInfo.pixelBuffer;
-      textureInfo.pixelBuffer.Reset();
 
       if( maskTextureInfo.loadState == LOAD_FINISHED )
       {
-        ApplyMask( pixelBuffer, maskTextureInfo.textureId, textureInfo.scaleFactor, textureInfo.cropToMask );
-        UploadTexture( pixelBuffer, textureInfo );
-        NotifyObservers( textureInfo, true );
+        // Send New Task to Thread
+        ApplyMask( textureInfo, maskTextureInfo.textureId );
       }
       else
       {
-        DALI_LOG_ERROR( "TextureManager::ApplyMask to %s failed\n", textureInfo.url.GetUrl().c_str() );
+        textureInfo.pixelBuffer.Reset();
         textureInfo.loadState = LOAD_FAILED;
         NotifyObservers( textureInfo, false );
       }
@@ -724,29 +879,35 @@ void TextureManager::CheckForWaitingTexture( TextureInfo& maskTextureInfo )
   }
 }
 
-void TextureManager::ApplyMask(
-  Devel::PixelBuffer& pixelBuffer, TextureId maskTextureId,
-  float contentScale, bool cropToMask )
+void TextureManager::ApplyMask( TextureInfo& textureInfo, TextureId maskTextureId )
 {
   int maskCacheIndex = GetCacheIndexFromId( maskTextureId );
-  Devel::PixelBuffer maskPixelBuffer = mTextureInfoContainer[maskCacheIndex].pixelBuffer;
-  pixelBuffer.ApplyMask( maskPixelBuffer, contentScale, cropToMask );
+  if( maskCacheIndex != INVALID_CACHE_INDEX )
+  {
+    Devel::PixelBuffer maskPixelBuffer = mTextureInfoContainer[maskCacheIndex].pixelBuffer;
+    Devel::PixelBuffer pixelBuffer = textureInfo.pixelBuffer;
+    textureInfo.pixelBuffer.Reset();
+
+    DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Concise, "TextureManager::ApplyMask(): url:%s sync:%s\n",
+                   textureInfo.url.GetUrl().c_str(), textureInfo.loadSynchronously?"T":"F" );
+
+    textureInfo.loadState = MASK_APPLYING;
+    auto& loadersContainer = textureInfo.url.IsLocalResource() ? mAsyncLocalLoaders : mAsyncRemoteLoaders;
+    auto loadingHelperIt = loadersContainer.GetNext();
+    auto premultiplyOnLoad = textureInfo.preMultiplyOnLoad ? DevelAsyncImageLoader::PreMultiplyOnLoad::ON : DevelAsyncImageLoader::PreMultiplyOnLoad::OFF;
+    DALI_ASSERT_ALWAYS(loadingHelperIt != loadersContainer.End());
+    loadingHelperIt->ApplyMask( textureInfo.textureId, pixelBuffer, maskPixelBuffer, textureInfo.scaleFactor, textureInfo.cropToMask, premultiplyOnLoad );
+  }
 }
 
-
 void TextureManager::UploadTexture( Devel::PixelBuffer& pixelBuffer, TextureInfo& textureInfo )
 {
   if( textureInfo.useAtlas != USE_ATLAS )
   {
-    DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Concise, "  TextureManager::UploadTexture() New Texture for textureId:%d\n", textureInfo.textureId );
+    DALI_LOG_INFO( gTextureManagerLogFilter, Debug::General, "  TextureManager::UploadTexture() New Texture for textureId:%d\n", textureInfo.textureId );
 
-    // If the texture doesn't have an alpha channel, can't pre-multiply it.
-    // Ensure that we don't change the load parameter (it's used for hashing), and instead set
-    // the status for use in the observer.
-    auto preMultiply = textureInfo.preMultiplyOnLoad ? TextureManager::MultiplyOnLoad::MULTIPLY_ON_LOAD :
-      TextureManager::MultiplyOnLoad::LOAD_WITHOUT_MULTIPLY;
-    PreMultiply( pixelBuffer, preMultiply );
-    textureInfo.preMultiplied = (preMultiply == TextureManager::MultiplyOnLoad::MULTIPLY_ON_LOAD );
+    // Check if this pixelBuffer is premultiplied
+    textureInfo.preMultiplied = pixelBuffer.IsAlphaPreMultiplied();
 
     Texture texture = Texture::New( Dali::TextureType::TEXTURE_2D, pixelBuffer.GetPixelFormat(),
                                     pixelBuffer.GetWidth(), pixelBuffer.GetHeight() );
@@ -773,53 +934,50 @@ void TextureManager::NotifyObservers( TextureInfo& textureInfo, bool success )
 
   // If there is an observer: Notify the load is complete, whether successful or not,
   // and erase it from the list
-  unsigned int observerCount = textureInfo.observerList.Count();
   TextureInfo* info = &textureInfo;
 
-  while( observerCount )
+  mQueueLoadFlag = true;
+
+  while( info->observerList.Count() )
   {
     TextureUploadObserver* observer = info->observerList[0];
 
     // During UploadComplete() a Control ResourceReady() signal is emitted.
     // During that signal the app may add remove /add Textures (e.g. via
-    // ImageViews).  At this point no more observers can be added to the
-    // observerList, because textureInfo.loadState = UPLOADED. However it is
-    // possible for observers to be removed, hence we check the observer list
-    // count every iteration.
-
-    // The reference to the textureInfo struct can also become invalidated,
-    // because new load requests can modify the mTextureInfoContainer list
-    // (e.g. if more requests are pushed back it can cause the list to be
-    // resized invalidating the reference to the TextureInfo ).
+    // ImageViews).
+    // It is possible for observers to be removed from the observer list,
+    // and it is also possible for the mTextureInfoContainer to be modified,
+    // invalidating the reference to the textureInfo struct.
+    // Texture load requests for the same URL are deferred until the end of this
+    // method.
+    DALI_LOG_INFO( gTextureManagerLogFilter, Debug::Concise, "NotifyObservers() url:%s loadState:%s\n",
+                   textureInfo.url.GetUrl().c_str(), GET_LOAD_STATE_STRING(textureInfo.loadState ) );
+
     observer->UploadComplete( success, info->textureId, info->textureSet, info->useAtlas, info->atlasRect,
                               info->preMultiplied );
     observer->DestructionSignal().Disconnect( this, &TextureManager::ObserverDestroyed );
 
-    // Get the textureInfo from the container again as it may have been
-    // invalidated,
-
+    // Get the textureInfo from the container again as it may have been invalidated.
     int textureInfoIndex = GetCacheIndexFromId( textureId );
     if( textureInfoIndex == INVALID_CACHE_INDEX)
     {
-      return; // texture has been removed - can stop.
+      break; // texture has been removed - can stop.
     }
-
     info = &mTextureInfoContainer[ textureInfoIndex ];
-    observerCount = info->observerList.Count();
-    if ( observerCount > 0 )
+
+    // remove the observer that was just triggered if it's still in the list
+    for( TextureInfo::ObserverListType::Iterator j = info->observerList.Begin(); j != info->observerList.End(); ++j )
     {
-      // remove the observer that was just triggered if it's still in the list
-      for( TextureInfo::ObserverListType::Iterator j = info->observerList.Begin(); j != info->observerList.End(); ++j )
+      if( *j == observer )
       {
-        if( *j == observer )
-        {
-          info->observerList.Erase( j );
-          observerCount--;
-          break;
-        }
+        info->observerList.Erase( j );
+        break;
       }
     }
   }
+
+  mQueueLoadFlag = false;
+  ProcessQueuedTextures();
 }
 
 TextureManager::TextureId TextureManager::GenerateUniqueTextureId()
@@ -848,8 +1006,7 @@ TextureManager::TextureHash TextureManager::GenerateHash(
   const FittingMode::Type        fittingMode,
   const Dali::SamplingMode::Type samplingMode,
   const UseAtlas                 useAtlas,
-  TextureId                      maskTextureId,
-  TextureManager::MultiplyOnLoad preMultiplyOnLoad)
+  TextureId                      maskTextureId )
 {
   std::string hashTarget( url );
   const size_t urlLength = hashTarget.length();
@@ -877,8 +1034,21 @@ TextureManager::TextureHash TextureManager::GenerateHash(
   {
     // We are not including sizing information, but we still need an extra byte for atlasing.
     hashTarget.resize( urlLength + 1u );
+
     // Add the atlasing to the hash input.
-    hashTarget[ urlLength ] = useAtlas;
+    switch( useAtlas )
+    {
+      case UseAtlas::NO_ATLAS:
+      {
+        hashTarget[ urlLength ] = 'f';
+        break;
+      }
+      case UseAtlas::USE_ATLAS:
+      {
+        hashTarget[ urlLength ] = 't';
+        break;
+      }
+    }
   }
 
   if( maskTextureId != INVALID_TEXTURE_ID )
@@ -896,22 +1066,6 @@ TextureManager::TextureHash TextureManager::GenerateHash(
     }
   }
 
-  auto premultipliedIndex = hashTarget.length();
-  hashTarget.resize( premultipliedIndex + 1 );
-  switch( preMultiplyOnLoad )
-  {
-    case TextureManager::MultiplyOnLoad::MULTIPLY_ON_LOAD:
-    {
-      hashTarget[ premultipliedIndex ] = 't';
-      break;
-    }
-    case TextureManager::MultiplyOnLoad::LOAD_WITHOUT_MULTIPLY:
-    {
-      hashTarget[ premultipliedIndex ] = 'f';
-      break;
-    }
-  }
-
   return Dali::CalculateHash( hashTarget );
 }
 
@@ -936,21 +1090,24 @@ int TextureManager::FindCachedTexture(
     {
       // We have a match, now we check all the original parameters in case of a hash collision.
       TextureInfo& textureInfo( mTextureInfoContainer[i] );
-      auto multiplyOnLoad = textureInfo.preMultiplyOnLoad ? TextureManager::MultiplyOnLoad::MULTIPLY_ON_LOAD :
-        TextureManager::MultiplyOnLoad::LOAD_WITHOUT_MULTIPLY;
 
       if( ( url == textureInfo.url.GetUrl() ) &&
           ( useAtlas == textureInfo.useAtlas ) &&
           ( maskTextureId == textureInfo.maskTextureId ) &&
           ( size == textureInfo.desiredSize ) &&
-          ( preMultiplyOnLoad ==  multiplyOnLoad ) &&
           ( ( size.GetWidth() == 0 && size.GetHeight() == 0 ) ||
             ( fittingMode == textureInfo.fittingMode &&
               samplingMode == textureInfo.samplingMode ) ) )
       {
-        // The found Texture is a match.
-        cacheIndex = i;
-        break;
+        // 1. If preMultiplyOnLoad is MULTIPLY_ON_LOAD, then textureInfo.preMultiplyOnLoad should be true. The premultiplication result can be different.
+        // 2. If preMultiplyOnLoad is LOAD_WITHOUT_MULTIPLY, then textureInfo.preMultiplied should be false.
+        if( ( preMultiplyOnLoad == TextureManager::MultiplyOnLoad::MULTIPLY_ON_LOAD && textureInfo.preMultiplyOnLoad )
+            || ( preMultiplyOnLoad == TextureManager::MultiplyOnLoad::LOAD_WITHOUT_MULTIPLY && !textureInfo.preMultiplied ) )
+        {
+          // The found Texture is a match.
+          cacheIndex = i;
+          break;
+        }
       }
     }
   }
@@ -991,10 +1148,23 @@ void TextureManager::AsyncLoadingHelper::Load(TextureId          textureId,
                                               ImageDimensions    desiredSize,
                                               FittingMode::Type  fittingMode,
                                               SamplingMode::Type samplingMode,
-                                              bool               orientationCorrection)
+                                              bool               orientationCorrection,
+                                              DevelAsyncImageLoader::PreMultiplyOnLoad  preMultiplyOnLoad)
 {
   mLoadingInfoContainer.push_back(AsyncLoadingInfo(textureId));
-  auto id = mLoader.Load(url.GetUrl(), desiredSize, fittingMode, samplingMode, orientationCorrection);
+  auto id = DevelAsyncImageLoader::Load( mLoader, url.GetUrl(), desiredSize, fittingMode, samplingMode, orientationCorrection, preMultiplyOnLoad );
+  mLoadingInfoContainer.back().loadId = id;
+}
+
+void TextureManager::AsyncLoadingHelper::ApplyMask( TextureId textureId,
+                                                    Devel::PixelBuffer pixelBuffer,
+                                                    Devel::PixelBuffer maskPixelBuffer,
+                                                    float contentScale,
+                                                    bool cropToMask,
+                                                    DevelAsyncImageLoader::PreMultiplyOnLoad preMultiplyOnLoad )
+{
+  mLoadingInfoContainer.push_back(AsyncLoadingInfo(textureId));
+  auto id = DevelAsyncImageLoader::ApplyMask( mLoader, pixelBuffer, maskPixelBuffer, contentScale, cropToMask, preMultiplyOnLoad );
   mLoadingInfoContainer.back().loadId = id;
 }
 
@@ -1016,9 +1186,14 @@ TextureManager::AsyncLoadingHelper::AsyncLoadingHelper(
 }
 
 void TextureManager::AsyncLoadingHelper::AsyncLoadComplete(uint32_t           id,
-                                                           Devel::PixelBuffer pixelBuffer)
+                                                           Devel::PixelBuffer pixelBuffer )
+{
+  mTextureManager.AsyncLoadComplete( mLoadingInfoContainer, id, pixelBuffer );
+}
+
+void TextureManager::SetBrokenImageUrl(const std::string& brokenImageUrl)
 {
-  mTextureManager.AsyncLoadComplete(mLoadingInfoContainer, id, pixelBuffer);
+  mBrokenImageUrl = brokenImageUrl;
 }
 
 } // namespace Internal