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Fixed bug #33 Mike Frysinger wrote: > with libsdl-1.2.9, some games (like bomberclone) started > segfaulting in Gentoo [...snip...] > the last change in the last hunk: [...snip...] > if i change the statement to read: > (table[which].blit_features & GetBlitFeatures()) == GetBlitFeatures() > bomberclone no longer segfaults on my box Alex Volkov wrote: > The test "(table[which].blit_features & GetBlitFeatures()) == > table[which].blit_features)" is correct, and the previous > "(table[which].cpu_mmx == SDL_HasMMX())" was actually broken. I think there is potentially a slightly different cause of the above problem. During the introduction of the Altivec code, the blit_table struct field 'alpha' got changed from a straightforward enum to a bitmask, which makes perfect sense by itself. However, now the table driven blitter selection code in SDL_CalculateBlitN() can choose the wrong blitters when searching for a NO_ALPHA blitter because of the following code: int a_need = 0; ... (a_need & table[which].alpha) == a_need && When searching through the normal_blit_2[] table, a SET_ALPHA blitter (like Blit_RGB565_ARGB8888) can now be selected instead of a NO_ALPHA one, causing alpha channel bits to appear in a non-alpha destination surface. I suppose this could theoretically be an indirect cause of the segfault mentioned above. I *think* this can be fixed by changing to int a_need = NO_ALPHA;
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:47:49 +0000
parents 355632dca928
children
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<HTML
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>SDL_EventState</TITLE
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>SDL_EventState</H1
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><H2
>Name</H2
>SDL_EventState&nbsp;--&nbsp;This function allows you to set the state of processing certain events.</DIV
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>Synopsis</H2
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><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
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><CODE
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>Uint8 <B
CLASS="FSFUNC"
>SDL_EventState</B
></CODE
>(Uint8 type, int state);</CODE
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><H2
>Description</H2
><P
>This function allows you to set the state of processing certain event <TT
CLASS="PARAMETER"
><I
>type</I
></TT
>'s.</P
><P
>If <TT
CLASS="PARAMETER"
><I
>state</I
></TT
> is set to <TT
CLASS="LITERAL"
>SDL_IGNORE</TT
>, 
that event <TT
CLASS="PARAMETER"
><I
>type</I
></TT
> will be automatically dropped from the event queue and will 
not be filtered.</P
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>If <TT
CLASS="PARAMETER"
><I
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></TT
> is set to <TT
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>SDL_ENABLE</TT
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that event <TT
CLASS="PARAMETER"
><I
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></TT
> will be processed normally.</P
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>If <TT
CLASS="PARAMETER"
><I
>state</I
></TT
> is set to <TT
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>SDL_QUERY</TT
>,
<TT
CLASS="FUNCTION"
>SDL_EventState</TT
> will return the current processing 
state of the specified event <TT
CLASS="PARAMETER"
><I
>type</I
></TT
>.</P
><P
>A list of event <TT
CLASS="PARAMETER"
><I
>type</I
></TT
>'s can be found in the <A
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>SDL_Event</SPAN
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> section.</P
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>SDL_Event</SPAN
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