Add codes to prevent underflow

[platform/core/uifw/dali-toolkit.git] / dali-toolkit / internal / visuals / npatch-loader.cpp

diff --git a/dali-toolkit/internal/visuals/npatch-loader.cpp b/dali-toolkit/internal/visuals/npatch-loader.cpp
index f23f1ca..8bc050f 100644 (file)
--- a/dali-toolkit/internal/visuals/npatch-loader.cpp
+++ b/dali-toolkit/internal/visuals/npatch-loader.cpp
@@ -79,10 +79,10 @@ std::size_t NPatchLoader::Load( const std::string& url, const Rect< int >& borde
     data->textureSet = mCache[ cachedIndex ]->textureSet;
 
     NinePatchImage::StretchRanges stretchRangesX;
-    stretchRangesX.PushBack( Uint16Pair( border.left, data->croppedWidth - border.right ) );
+    stretchRangesX.PushBack( Uint16Pair( border.left, ( (data->croppedWidth >= static_cast< unsigned int >( border.right )) ? data->croppedWidth - border.right : 0 ) ) );
 
     NinePatchImage::StretchRanges stretchRangesY;
-    stretchRangesY.PushBack( Uint16Pair( border.top, data->croppedHeight - border.bottom ) );
+    stretchRangesY.PushBack( Uint16Pair( border.top, ( (data->croppedHeight >= static_cast< unsigned int >( border.bottom )) ? data->croppedHeight - border.bottom : 0 ) ) );
 
     data->stretchPixelsX = stretchRangesX;
     data->stretchPixelsY = stretchRangesY;
@@ -137,10 +137,10 @@ std::size_t NPatchLoader::Load( const std::string& url, const Rect< int >& borde
       data->textureSet.SetTexture( 0u, texture );
 
       NinePatchImage::StretchRanges stretchRangesX;
-      stretchRangesX.PushBack( Uint16Pair( border.left, data->croppedWidth - border.right ) );
+      stretchRangesX.PushBack( Uint16Pair( border.left, ( (data->croppedWidth >= static_cast< unsigned int >( border.right )) ? data->croppedWidth - border.right : 0 ) ) );
 
       NinePatchImage::StretchRanges stretchRangesY;
-      stretchRangesY.PushBack( Uint16Pair( border.top, data->croppedHeight - border.bottom ) );
+      stretchRangesY.PushBack( Uint16Pair( border.top, ( (data->croppedHeight >= static_cast< unsigned int >( border.bottom )) ? data->croppedHeight - border.bottom : 0 ) ) );
 
       data->stretchPixelsX = stretchRangesX;
       data->stretchPixelsY = stretchRangesY;