Mercurial > sdl-ios-xcode
view docs/man3/SDL_SetModState.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_SetModState" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference" .SH "NAME" SDL_SetModState\- Set the current key modifier state .SH "SYNOPSIS" .PP \fB#include "SDL\&.h" .sp \fBvoid \fBSDL_SetModState\fP\fR(\fBSDLMod modstate\fR); .SH "DESCRIPTION" .PP The inverse of \fI\fBSDL_GetModState\fP\fR, \fBSDL_SetModState\fP allows you to impose modifier key states on your application\&. .PP Simply pass your desired modifier states into \fBmodstate\fR\&. This value my be a logical OR\&'d combination of the following: .PP .nf \f(CWtypedef enum { KMOD_NONE = 0x0000, KMOD_LSHIFT= 0x0001, KMOD_RSHIFT= 0x0002, KMOD_LCTRL = 0x0040, KMOD_RCTRL = 0x0080, KMOD_LALT = 0x0100, KMOD_RALT = 0x0200, KMOD_LMETA = 0x0400, KMOD_RMETA = 0x0800, KMOD_NUM = 0x1000, KMOD_CAPS = 0x2000, KMOD_MODE = 0x4000, } SDLMod;\fR .fi .PP .SH "SEE ALSO" .PP \fI\fBSDL_GetModState\fP\fR ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00