Merge from 1.7 branch, revisions 3515-3533. createImage memleak fixed. TGA loader fixed.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@3534 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CImage.cpp

@@ -52,7 +52,10 @@ void CImage::initData()
 	Pitch = BytesPerPixel * Size.Width;
 
 	if (!Data)
+	{
+		DeleteMemory=true;
 		Data = new u8[Size.Height * Pitch];
+	}
 }
 
 

source/Irrlicht/CImageWriterTGA.cpp

@@ -133,7 +133,7 @@ bool CImageWriterTGA::writeImage(io::IWriteFile *file, IImage *image,u32 param)
 	if (file->write(&imageFooter, sizeof(imageFooter)) < (s32)sizeof(imageFooter))
 		return false;
 
-	return imageHeader.ImageHeight < y;
+	return imageHeader.ImageHeight <= y;
 }
 
 } // namespace video

source/Irrlicht/COpenGLDriver.cpp

@@ -839,7 +839,8 @@ void COpenGLDriver::clearBuffers(bool backBuffer, bool zBuffer, bool stencilBuff
 	if (stencilBuffer)
 		mask |= GL_STENCIL_BUFFER_BIT;
 
-	glClear(mask);
+	if (mask)
+		glClear(mask);
 }