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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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parents: 55
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1 .TH "SDL_KeyboardEvent" "3" "Tue 11 Sep 2001, 22:59" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_KeyboardEvent\- Keyboard event structure
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4 .SH "STRUCTURE DEFINITION"
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5 .PP
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6 .nf
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7 \f(CWtypedef struct{
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8 Uint8 type;
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9 Uint8 state;
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10 SDL_keysym keysym;
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11 } SDL_KeyboardEvent;\fR
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12 .fi
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13 .PP
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14 .SH "STRUCTURE DATA"
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15 .TP 20
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16 \fBtype\fR
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17 \fBSDL_KEYDOWN\fP or \fBSDL_KEYUP\fP
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18 .TP 20
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19 \fBstate\fR
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20 \fBSDL_PRESSED\fP or \fBSDL_RELEASED\fP
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21 .TP 20
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22 \fBkeysym\fR
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23 Contains key press information
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24 .SH "DESCRIPTION"
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25 .PP
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26 \fBSDL_KeyboardEvent\fR is a member of the \fI\fBSDL_Event\fR\fR union and is used when an event of type \fBSDL_KEYDOWN\fP or \fBSDL_KEYUP\fP is reported\&.
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27 .PP
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28 The \fBtype\fR and \fBstate\fR actually report the same information, they just use different values to do it! A keyboard event occurs when a key is released (\fBtype\fR=\fBSDK_KEYUP\fP or \fBstate\fR=\fBSDL_RELEASED\fP) and when a key is pressed (\fBtype\fR=\fBSDL_KEYDOWN\fP or \fBstate\fR=\fBSDL_PRESSED\fP)\&. The information on what key was pressed or released is in the \fI\fBkeysym\fR\fR structure\&.
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29 .PP
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30 .RS
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31 \fBNote:
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32 .PP
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33 Repeating \fBSDL_KEYDOWN\fP events will occur if key repeat is enabled (see \fI\fBSDL_EnableKeyRepeat\fP\fR)\&.
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34 .RE
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35 .SH "SEE ALSO"
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36 .PP
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37 \fI\fBSDL_Event\fR\fR, \fI\fBSDL_keysym\fR\fR, \fI\fBSDL_EnableKeyRepeat\fP\fR, \fI\fBSDL_EnableUNICODE\fP\fR
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38 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:59