Cairo branch (was Re: Emacs as browser (was Re: Concurrency, again))

Cairo branch (was Re: Emacs as browser (was Re: Concurrency, again))

[Dov Grobgeld]

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Here are some more insights on the cairo branch and the failure to display
image magick images.

1. The image is never copied from the ​image magick image to the XImage as
the function lookup_rgb_color() is essentially a no-op for CAIRO. I worked
around this by hardcoding the following in lookup_rgb_color()

  pixel = (((r>>8) << 16) | ((g>>8)<<8) | (b>>8));

2. image_sync_to_pixmaps() is never called so the XImage is never synced to
the server! I temporarily worked around this by the following temporary
patch:

    /* Put ximg into the image.  */
    image_put_x_image (f, img, ximg, 0);
+  image_sync_to_pixmaps(f,img);

This made the image show up on loading. But the image still isn't shown
properly e.g. when resizing the frame. (Why?)

Unfortunately this is as far as I got. My partial conclusion is that the
changes in the cairo branch somehow destroyed the refreshing of images (and
possibly other refreshing issues). What is needed to solve this is someone
knowledgeable of the X11 code in image.c . Unfortunately I can't spend any
more time on it.

Regards,
Dov

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