Mercurial > sdl-ios-xcode
view docs/man3/SDL_JoystickEventState.3 @ 1543:98f9b16f565c
From: "Alex Volkov"
Date: Thu, 10 Nov 2005 21:53:40 -0500
Subject: [SDL] BUG[?]: 32bpp RGBA->RGB colorkey blit, no SDL_SRCALPHA
It seems there is either a documentation vs. reality mismatch or a real bug
in SDL_blit_N.c:BlitNtoNKey().
The exact blit in question is a 32bpp RGBA->RGB, where RGBA has SDL_COLORKEY
and *no* SDL_SRCALPHA flags. The doc in SDL_video.h states:
* RGBA->RGB:
* SDL_SRCALPHA not set:
* copy RGB.
* if SDL_SRCCOLORKEY set, only copy the pixels matching the
* RGB values of the source colour key, ignoring alpha in the
* comparison.
BlitNtoNKey(), however, forgets to "ignore alpha in the comparison". The
documentation makes perfect sense, so I think it is the code that is faulty.
The attached patch corrects the code.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 15 Mar 2006 15:43:15 +0000 |
| parents | e5bc29de3f0a |
| children | 546f7c1eb755 |
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.TH "SDL_JoystickEventState" "3" "Tue 11 Sep 2001, 22:59" "SDL" "SDL API Reference" .SH "NAME" SDL_JoystickEventState\- Enable/disable joystick event polling .SH "SYNOPSIS" .PP \fB#include "SDL\&.h" .sp \fBint \fBSDL_JoystickEventState\fP\fR(\fBint state\fR); .SH "DESCRIPTION" .PP This function is used to enable or disable joystick event processing\&. With joystick event processing disabled you will have to update joystick states with \fI\fBSDL_JoystickUpdate\fP\fR and read the joystick information manually\&. \fBstate\fR is either \fBSDL_QUERY\fP, \fBSDL_ENABLE\fP or \fBSDL_IGNORE\fP\&. .PP .RS \fBNote: .PP Joystick event handling is prefered .RE .SH "RETURN VALUE" .PP If \fBstate\fR is \fBSDL_QUERY\fP then the current state is returned, otherwise the new processing \fBstate\fR is returned\&. .SH "SEE ALSO" .PP \fISDL Joystick Functions\fR, \fI\fBSDL_JoystickUpdate\fP\fR, \fI\fBSDL_JoyAxisEvent\fR\fR, \fI\fBSDL_JoyBallEvent\fR\fR, \fI\fBSDL_JoyButtonEvent\fR\fR, \fI\fBSDL_JoyHatEvent\fR\fR ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:59