Mail Archives: djgpp/1998/05/11/06:16:36
From: | Xavier Prat Recio <prat AT mmt DOT upc DOT es>
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Newsgroups: | comp.os.msdos.djgpp
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Subject: | grx22 bug???
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Date: | Mon, 11 May 1998 12:09:49 +0200
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Organization: | Universitat Politècnica de Catalunya
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Lines: | 53
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Message-ID: | <3556CE6C.3785FD85@mmt.upc.es>
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NNTP-Posting-Host: | maria.upc.es
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Mime-Version: | 1.0
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To: | djgpp AT delorie DOT com
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DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
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Este es un mensaje multipartes en formato MIME.
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Hi everybody
I don't know wether I've found a bug in grx22, which also stands for
grx20, or it's just my little knowledge of that library which makes me
think so. Let's explain what happens.
I am building a numerical solver programa with djgpp2.0 which also tries
to print graphically its results. When doing so, I convert each
numerical value, double precission, into a rgb 'color' ranging from 0 to
255, that is GrNumColors()-1. The fucntion I use is
c=GrAllocColor(r,g,b). Then, I also implement a graphical reading
procedure which qeries for the color represented in each pixel and
converts that color into its correct numerical value. However, when
performing that action with GrQueryColor(c,&r,&g,&b) I found that those
rgb values set to GrNumColors()-1, that is 255 in my graphics mode, once
read become 252!!!. Those set to 0 are 0 equally, but what happen to
those in between?
If it's any help, my graphics board is a S3 with 1Mb.
Any hint?. Let me know, please.
Xavier Prat Recio
Universitat Politècnica de Catalunya
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