Fix issue 115.

ChangeLog

@@ -1,3 +1,6 @@
+NVIDIA Texture Tools version 2.0.8
+ * ColorBlock::isSingleColor compares only RGB channels. Fixes issue 115.
+
 NVIDIA Texture Tools version 2.0.7
  * Output correct exit codes. Fixes issue 92.
  * Fix thread-safety errors. Fixes issue 90.

src/nvimage/ColorBlock.cpp

@@ -113,15 +113,18 @@ void ColorBlock::splatY()
 /// Returns true if the block has a single color.
 bool ColorBlock::isSingleColor() const
 {
-	for(int i = 1; i < 16; i++)
-	{
-		if (m_color[0] != m_color[i])
-		{
-			return false;
-		}
-	}
-	
-	return true;
+	Color32 mask(0xFF, 0xFF, 0xFF, 0x00);
+	uint u = m_color[0].u & mask.u;
+        
+	for (int i = 1; i < 16; i++)
+	{
+		if (u != (m_color[i].u & mask.u))
+		{
+			return false;
+		}
+	}
+        
+	return true;
 }
 
 /// Count number of unique colors in this color block.