Memory leak caused by Box::draw()

jutirain · #1 01-Dec-2007, 08:12

Hi,

I've used valgrind and discovered that the following function may cause memory leak.

ImageBox is a user-defined class that heritage from Fl_Box.

image_mod is in the type of another image processing library. I copy it to temp_char_array to initialize Fl_RGB_Image.
(Actually I can use image_mod to initialize Fl_RGB_Image directly, but still cause memory leak, however)

Besides, the image show up on the window is correct, so the initialization of Fl_RGB_Image may not be the problem...

The valgrind output point out the problem to be libfontconfig.so, may not help, but the leak summary is listed below:

==11010== LEAK SUMMARY:
==11010== definitely lost: 806 bytes in 6 blocks.
==11010== indirectly lost: 848 bytes in 42 blocks.
==11010== possibly lost: 0 bytes in 0 blocks.
==11010== still reachable: 1,201,143 bytes in 2,859 blocks.
==11010== suppressed: 0 bytes in 0 blocks.
==11010== Reachable blocks (those to which a pointer was found) are not shown.
==11010== To see them, rerun with: --show-reachable=yes

No matter the image size, the leak size is always ( 806, 848 )

Any idea?

CPP / C++ / C Code:

void ImageBox::draw()
{
	// create a temporary char array which has the dimension [width * height * channels]
	unsigned char temp_char_array[ image_mod.width() * image_mod.height() * image_mod.channels() ] ;

	// stuff the temporary char array with the information in image_mod
	size_t cur_index = 0 ;
	for ( size_t y = 0 ; y < image_mod.height() ; ++y )
		for( size_t x = 0 ; x < image_mod.width() ; ++x )
			for( size_t c = 0 ; c < image_mod.channels() ; ++c )
			{
				temp_char_array[cur_index] = image_mod(x, y)[c] ;
				cur_index++ ;
			}

	Fl_RGB_Image temp(
			temp_char_array,
			image_mod.width(),
			image_mod.height(),
			image_mod.channels()) ;

	image( temp ) ;

	// using draw() of super class to do the rest (if any)
	Fl_Box::draw() ;	
}

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