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view docs/man3/SDL_CDName.3 @ 688:c0522010bb6d
Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
From: "Mattias Engdeg?rd"
Subject: bug in SDL_GetRGB/GetRGBA
There's an embarrassing bug in GetRGB/GetRGBA which apparently has been there
for years. It incorrectly converts colours with < 8 bits/channel.
It came to my attention today in #sdl.
What it does now is (for each channel):
rv = (pixel & fmt->Rmask) >> fmt->Rshift;
*r = (rv << fmt->Rloss) + (rv >> (8 - fmt->Rloss));
which is wrong; the last line should be
*r = (rv << fmt->Rloss) + (rv >> (8 - (fmt->Rloss << 1)));
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 12 Aug 2003 15:17:20 +0000 |
| parents | e5bc29de3f0a |
| children | 546f7c1eb755 |
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.TH "SDL_CDName" "3" "Tue 11 Sep 2001, 22:58" "SDL" "SDL API Reference" .SH "NAME" SDL_CDName\- Returns a human-readable, system-dependent identifier for the CD-ROM\&. .SH "SYNOPSIS" .PP \fB#include "SDL\&.h" .sp \fBconst char *\fBSDL_CDName\fP\fR(\fBint drive\fR); .SH "DESCRIPTION" .PP Returns a human-readable, system-dependent identifier for the CD-ROM\&. \fBdrive\fR is the index of the drive\&. Drive indices start to 0 and end at \fBSDL_CDNumDrives()\fP-1\&. .SH "EXAMPLES" .PP .IP " \(bu" 6 "/dev/cdrom" .IP " \(bu" 6 "E:" .IP " \(bu" 6 "/dev/disk/ide/1/master" .SH "SEE ALSO" .PP \fI\fBSDL_CDNumDrives\fP\fR ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:58