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.

.TH "SDL_GetVideoInfo" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" 
.SH "NAME"
SDL_GetVideoInfo\- returns a pointer to information about the video hardware
.SH "SYNOPSIS"
.PP
\fB#include "SDL\&.h"
.sp
\fBSDL_VideoInfo *\fBSDL_GetVideoInfo\fP\fR(\fBvoid\fR);
.SH "DESCRIPTION"
.PP
This function returns a read-only pointer to \fIinformation\fR about the video hardware\&. If this is called before \fISDL_SetVideoMode\fR, the \fBvfmt\fR member of the returned structure will contain the pixel format of the "best" video mode\&.
.SH "SEE ALSO"
.PP
\fI\fBSDL_SetVideoMode\fP\fR, \fI\fBSDL_VideoInfo\fR\fR
...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01