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view docs/man3/SDL_GetEventFilter.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_GetEventFilter" "3" "Tue 11 Sep 2001, 22:59" "SDL" "SDL API Reference" .SH "NAME" SDL_GetEventFilter\- Retrieves a pointer to he event filter .SH "SYNOPSIS" .PP \fB#include "SDL\&.h" .sp \fBSDL_EventFilter \fBSDL_GetEventFilter\fP\fR(\fBvoid\fR); .SH "DESCRIPTION" .PP This function retrieces a pointer to the event filter that was previously set using \fI\fBSDL_SetEventFilter\fP\fR\&. An SDL_EventFilter function is defined as: .PP .nf \f(CWtypedef int (*SDL_EventFilter)(const SDL_Event *event);\fR .fi .PP .SH "RETURN VALUE" .PP Returns a pointer to the event filter or \fBNULL\fP if no filter has been set\&. .SH "SEE ALSO" .PP \fI\fBSDL_Event\fR\fR, \fI\fBSDL_SetEventFilter\fP\fR ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:59