Re: Identifying the face between STRETCH and right fringe.

[Robert Pluim]

Robert Pluim <address@hidden> writes:

> Eli Zaretskii <address@hidden> writes:
>
>>> From: Robert Pluim <address@hidden>
>>> Cc: address@hidden
>>> Date: Tue, 27 Nov 2018 14:55:23 +0100
>>> 
>>> >> When we get here, face->background == 1, and FRAME_BACKGROUND_PIXEL ==
>>> >> 0xfffeffff
>>> >> 
>>> >> Looking through nsfns.m, the problem becomes obvious: the NS port uses
>>> >> indices into a color table to specify the background colour of faces,
>>> >> and FRAME_BACKGROUND_PIXEL is an RGBA value.
>>> >
>>> > Why does NS use indices here, and not RGBA values?
>>> 
>>> Probably because NS doesnʼt really use the RGBA values directly at
>>> all, but uses the indices all the time.
>>
>> So where does the RGBA value in FRAME_BACKGROUND_PIXEL come from?
>>
>>> > If no better/cleaner idea emerges, how about having an NS-specific
>>> > code here that computed the it->face's background RGBA by indexing
>>> > into the color table, before comparing that with
>>> > FRAME_BACKGROUND_PIXEL?

(showing my ignorance of redisplay) Is there a reason we need to
compare with the background of the frame rather than with the
background of the default face of the frame?

Robert