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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_MouseButtonEvent" "3" "Tue 11 Sep 2001, 22:59" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_MouseButtonEvent\- Mouse button 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 button;
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10 Uint8 state;
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11 Uint16 x, y;
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12 } SDL_MouseButtonEvent;\fR
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13 .fi
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14 .PP
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15 .SH "STRUCTURE DATA"
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16 .TP 20
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17 \fBtype\fR
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18 \fBSDL_MOUSEBUTTONDOWN\fP or \fBSDL_MOUSEBUTTONUP\fP
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19 .TP 20
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20 \fBbutton\fR
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21 The mouse button index (SDL_BUTTON_LEFT, SDL_BUTTON_MIDDLE, SDL_BUTTON_RIGHT)
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22 .TP 20
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23 \fBstate\fR
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24 \fBSDL_PRESSED\fP or \fBSDL_RELEASED\fP
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25 .TP 20
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26 \fBx\fR, \fBy\fR
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27 The X/Y coordinates of the mouse at press/release time
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28 .SH "DESCRIPTION"
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29 .PP
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30 \fBSDL_MouseButtonEvent\fR is a member of the \fI\fBSDL_Event\fR\fR union and is used when an event of type \fBSDL_MOUSEBUTTONDOWN\fP or \fBSDL_MOUSEBUTTONUP\fP is reported\&.
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31 .PP
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32 When a mouse button press or release is detected then number of the button pressed (from 1 to 255, with 1 usually being the left button and 2 the right) is placed into \fBbutton\fR, the position of the mouse when this event occured is stored in the \fBx\fR and the \fBy\fR fields\&. Like \fI\fBSDL_KeyboardEvent\fR\fR, information on whether the event was a press or a release event is stored in both the \fBtype\fR and \fBstate\fR fields, but this should be obvious\&.
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33 .SH "SEE ALSO"
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34 .PP
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35 \fI\fBSDL_Event\fR\fR, \fI\fBSDL_MouseMotionEvent\fR\fR
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36 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 22:59