Problem with alpha-channel (Visual Studio)

Hi all,

I need some help from you: I have created a alpha-channel surface, then I render an SVG image (using librsvg) but on the screen appear a black halo around my image, and I don't know why. I have attached an image with final result from the screen. This is my code: 

void PaintSVG(HDC hdc, long width, long height)
{
	cairo_surface_t *surface = cairo_win32_surface_create_with_dib(CAIRO_FORMAT_ARGB32, width, height);
	cairo_t* cr = cairo_create(surface);



	rsvg_handle_render_cairo(my_svg_handle, cr);

	HDC src = cairo_win32_surface_get_dc(surface);

	BitBlt(hdc, 0, 0, width, height, src, 0, 0, SRCCOPY);



	cairo_destroy(cr);
	cairo_surface_destroy(surface);
}

Is there something wrong with my code?

Thank you very much!
RG.

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