[Libvisual-devel] alpha overlay!

[Dennis S. <sy...@yo...>]

Alpha overlay is almost completely working now!

By doing (in the render thread in the xmms plugin):

        VisVideo *bitmapje = visual_bitmap_load_new_video
("/alphachantest.bmp");
        VisVideo *bitmapje32 = visual_video_new ();

        visual_video_set_depth (bitmapje32, VISUAL_VIDEO_DEPTH_32BIT);
        visual_video_set_dimension (bitmapje32, bitmapje->width,
bitmapje->height);
        visual_video_allocate_buffer (bitmapje32);
        visual_video_depth_transform (bitmapje32, bitmapje);


	/* This is the color to alpha chan function (the first 3 numbers
	 * are the r g b values for the color that is going to be
	 * the alpha channel and the last number is
	 * the density of the other colors */
        visual_video_alpha_color (bitmapje32, 255, 0, 234, 128);


Now after visual_bin_run:

	visual_video_blit_overlay (video, bitmapje32, 10, 10, TRUE);

10, 10 is placement, the TRUE flag tells the overlay function
to look for an alpha channel.


Result:
http://libvisual.sourceforge.net/libvisual-overlay.png

First image is with density at 128 second image at 255.
The picture has some rough edges, but that is in the pic
not libvisual :)


Cheers,
Dennis