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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
rev   line source
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e5bc29de3f0a Updated from the SDL Documentation Project
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1 .TH "SDL_InitSubSystem" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_InitSubSystem\- Initialize subsystems
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4 .SH "SYNOPSIS"
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5 .PP
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6 \fB#include "SDL\&.h"
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7 .sp
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8 \fBint \fBSDL_InitSubSystem\fP\fR(\fBUint32 flags\fR);
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9 .SH "DESCRIPTION"
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10 .PP
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11 After SDL has been initialized with \fI\fBSDL_Init\fP\fR you may initialize uninitialized subsystems with \fBSDL_InitSubSystem\fP\&. The \fBflags\fR parameter is the same as that used in \fI\fBSDL_Init\fP\fR\&.
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12 .SH "EXAMPLES"
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13 .PP
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14 .nf
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15 \f(CW/* Seperating Joystick and Video initialization\&. */
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16 SDL_Init(SDL_INIT_VIDEO);
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17 \&.
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18 \&.
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19 SDL_SetVideoMode(640, 480, 16, SDL_DOUBLEBUF|SDL_FULLSCREEN);
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20 \&.
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21 /* Do Some Video stuff */
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22 \&.
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23 \&.
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24 /* Initialize the joystick subsystem */
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25 SDL_InitSubSystem(SDL_INIT_JOYSTICK);
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26
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27 /* Do some stuff with video and joystick */
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28 \&.
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29 \&.
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30 \&.
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31 /* Shut them both down */
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32 SDL_Quit();\fR
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33 .fi
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34 .PP
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35 .SH "RETURN VALUE"
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36 .PP
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37 Returns \fB-1\fR on an error or \fB0\fR on success\&.
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38 .SH "SEE ALSO"
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39 .PP
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40 \fI\fBSDL_Init\fP\fR, \fI\fBSDL_Quit\fP\fR, \fI\fBSDL_QuitSubSystem\fP\fR
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41 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00