Number: 568

Date: 10-Apr-84  9':35':49

Submitter: Sannella.PA

Source: Masinter.pa

Subject: Document/change new arg to READBITMAP

Lisp Version: 

Description: '
Date':  6 Apr 84 15':51 PST'
From': Masinter.pa'
Subject': [Martin.pasa': [VANBUER@USC-ECL.ARPA': CHANGEBACKGROUND and bitmaps]]'
To': Burton'
cc': LispSupport'
'
AR': Window/other'
'
READBITMAP barfed, non-numeric arg, when I tried to merely shift-select this into my EXEC window. The READBITMAP wanted'
'
(24 14 1'
'
rather than (24 14'
'
as the first line. Did the format of bitmaps on files changed? Wasn''t it made backward compatible?'
'
     ----- Forwarded Messages -----'
'
Date':  5 Apr 84 16':56 PST'
From': Martin.pasa'
Subject': [VANBUER@USC-ECL.ARPA': CHANGEBACKGROUND and bitmaps]'
To': LispUsers^.pa'
cc': Martin.pasa'
'
Thought you all might like to see this.  '
'
     ----- Forwarded Messages -----'
'
Received': from USC-ECL.ARPA by PARC-MAXC.ARPA; 30 MAR 84 08':27':10 PST'
Date': 30 Mar 84 08':26 PST'
From': VANBUER@USC-ECL.ARPA'
Subject': CHANGEBACKGROUND and bitmaps'
To': Martin.pasa'
cc': VanBuer@USC-ECL.ARPA'
'
From playing around with this, the restriction on bitmaps to get "right" results'
is that the width of the bitmap must be a multiple of 8 and at least 16.  The'
height is unrestricted.'
Try this one':'
(SETQ BBB(READBITMAP))'
(24 14'
"@@AOO@@@"'
"@@B@@H@@"'
"@@B@@H@@"'
"@@D@@D@@"'
"@@D@@D@@"'
"@@H@@B@@"'
"@@H@@B@@"'
"OO@@@A@@"'
"@@H@@B@@"'
"@@H@@B@@"'
"@@D@@D@@"'
"@@D@@D@@"'
"@@B@@H@@"'
"@@B@@H@@")'
(CHANGEBACKGROUND BBB)'
'
Amazingly, the distortion is only 1% even though it''s only a 14x24 tile.'
	Darrel'
-------'
'
     ----- End of Forwarded Messages -----'
'
     ----- End of Forwarded Messages -----'


Workaround: 

Test Case: 

Edit-By: 

Edit-Date: 

Attn: Burton.pa

Assigned To: 

In/By: 

Disposition: 

System: Windows and Graphics

Subsystem: Other

Machine: 

Disk: 

Microcode Version: 

Memory Size: 

File Server: 

Server Software Version: 

Difficulty: 

Frequency: Everytime

Impact: Annoying

Priority: Perhaps

Status: Open

Problem Type: Documentation

Source Files: