Please support cairo for background image

[Koichi Akabe]

Some plugins contain images for default backgrounds and filters, but some of these images are too large (e.g. nexus/images/background.png is 1.5MB)

I think some images are able to draw on runtime using cairo:
plugins/nexus/images/background.png -> cairo_pattern_create_radial
plugins/nexus/images/glow-radial.png -> cairo_pattern_create_radial, cairo_rectangle
plugins/nexus/images/trail.png -> cairo_pattern_create_linear, cairo_pattern_add_color_stop_rgba
plugins/galaxy/images/star.png -> cairo_pattern_create_radial

Runtime drawing is better than fixed images because it's able to be resized and it can shlink file size.

[Maximilian Schnarr (fyrmir)]

It is now possible to use cairo for background images by using LwCairoTexture with the lw_background_new_with_default_texture function. In the latest revision (rev. 206), I removed nexus' background image. I guess all problems mentioned in this bug report are fixed, so I mark it as fixed.