GNU bug report logs - #3207
23.0.93; x-display-planes is incorrect in NS port

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Message #25 received at 3207 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: David Reitter <david.reitter <at> gmail.com>
To: Chong Yidong <cyd <at> stupidchicken.com>
Cc: Adrian Robert <Adrian.B.Robert <at> gmail.com>, Ian Eure <ian <at> digg.com>,
        3207 <at> debbugs.gnu.org
Subject: Re: 23.0.93; x-display-planes is incorrect in NS port
Date: Sun, 10 May 2009 18:11:53 -0400

[Message part 1 (text/plain, inline)]

On May 10, 2009, at 5:53 PM, Chong Yidong wrote:

> Adrian, could you take a look at this bug?  Can you reproduce it?
>
>
> Ian Eure <ian <at> digg.com> wrote:
>
>> When starting up NextStep Emacs compiled from CVS HEAD, the old XPM
>> splash image is used, rather than the new PNG.
>>
>> This appears to be caused by (display-planes) reporting an eight- 
>> plane
>> display. This is almost certainly incorrect.
>>
>> Looking deeper, (display-planes) calls (x-display-planes), in  
>> nsfns.m.
>> I don’t see anything obviously wrong, but it’s reporting that I have
>> an 8-plane display when it’s 24-plane. Evaluating (x-display-color-
>> cells) produces the correct value: 16777216, indicating a 24-bit
>> display.


Yeah, the x-display-planes implementation in nsfns.m should use  
NSBitsPerPixelFromDepth.
It reports 8 because this is 8 bits per color, and we have three  
colors.  Hence 24bit color depth.

- David



diff --git a/src/nsfns.m b/src/nsfns.m
index a6fb7f1..8b5c330 100644
--- a/src/nsfns.m
+++ b/src/nsfns.m
@@ -2486,7 +2486,7 @@ If omitted or nil, that stands for the selected  
frame's display.  */)
 {
   check_ns ();
   return make_number
-    (NSBitsPerSampleFromDepth ([ns_get_screen (display) depth]));
+    (NSBitsPerPixelFromDepth ([ns_get_screen (display) depth]));
 }

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