Re: [sdl.web@gmail.com: Re: problem with transparent PNG image display]

[Miles Bader <miles@gnu.org>]

Richard Stallman <rms@gnu.org> writes:
> The cache could record what background color was used for rendering.
> Then, on displaying the image again, if the desired background is
> different, that could cause a cache-mismatch, which would cause
> re-rendering.

I thought it already did this (in image.c:search_image_cache):

2007-06-13  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>

	* dispextern.h (struct image) [HAVE_WINDOW_SYSTEM]: New members
	frame_foreground and frame_background.

	* image.c (lookup_image): Save frame foreground and background colors.
	(search_image_cache): Check if saved and current frame colors match.

-Miles

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