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It turns out both the software and the OpenGL renderer had the same problem. According to the spec, when SDL_SRCALPHA is set, the colorkey is ignored, so we just need to convert the colorkey into the alpha channel.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 25 Nov 2008 05:29:14 +0000
parents 355632dca928
children
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<HTML
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><TITLE
>SDL_Rect</TITLE
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><H1
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>SDL_Rect</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN3046"
></A
><H2
>Name</H2
>SDL_Rect&nbsp;--&nbsp;Defines a rectangular area</DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN3049"
></A
><H2
>Structure Definition</H2
><PRE
CLASS="PROGRAMLISTING"
>typedef struct{
  Sint16 x, y;
  Uint16 w, h;
} SDL_Rect;</PRE
></DIV
><DIV
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><A
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></A
><H2
>Structure Data</H2
><DIV
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><TABLE
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><TBODY
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><TD
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><TT
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><I
>x, y</I
></TT
></TD
><TD
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>Position of the upper-left corner of the rectangle</TD
></TR
><TR
><TD
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VALIGN="TOP"
><TT
CLASS="STRUCTFIELD"
><I
>w, h</I
></TT
></TD
><TD
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VALIGN="TOP"
>The width and height of the rectangle</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
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></A
><H2
>Description</H2
><P
>A <SPAN
CLASS="STRUCTNAME"
>SDL_Rect</SPAN
> defines a rectangular area of pixels. It is used by <A
HREF="sdlblitsurface.html"
><TT
CLASS="FUNCTION"
>SDL_BlitSurface</TT
></A
> to define blitting regions and by several other video functions.</P
></DIV
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><A
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></A
><H2
>See Also</H2
><P
><A
HREF="sdlblitsurface.html"
><TT
CLASS="FUNCTION"
>SDL_BlitSurface</TT
></A
>,
<A
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><TT
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>SDL_UpdateRect</TT
></A
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