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To: sdl@libsdl.org From: Christian Walther <cwalther@gmx.ch> Date: Wed, 28 Dec 2005 12:13:20 +0100 Subject: [SDL] Fix for opening documents on Mac OS X < 10.4 The current code in SDLMain.m that transforms documents opened from the Finder into command-line arguments (introduced in revision 1.14, 2005-08-11) uses the methods -[NSString lengthOfBytesUsingEncoding:] and -[NSString getCString:maxLength:encoding:], which are only available in Mac OS X 10.4. Compiling this code on 10.3 produces warnings, and running it (i.e. starting an SDL application by opening a document) leads to weird behavior which I didn't investigate in detail ("*** -[NSCFString lengthOfBytesUsingEncoding:]: selector not recognized" is printed to the console log, and the SDL window never opens). The attached patch removes the offending calls and uses -[NSString UTF8String] instead, which is available everywhere. Tested on 10.3.9, and I see no reason why it shouldn't also work on 10.2 and 10.4. Two further comments: * The comment above the -[SDLMain application: openFile:] implementation says "You need to have a CFBundleDocumentsType section in your Info.plist to get this message, apparently." This is not the case in my experience - it worked just fine with a hand-built bare-bones application consisting only of Test.app/Contents/MacOS/test, without any Info.plist (although you have to press the option and command keys for such an application to accept a dragged file). * I took the liberty of cleaning up another area of SDLMain.m: I changed "CustomApplicationMain (argc, argv)" to "CustomApplicationMain (int argc, char **argv)". This avoids the "type of `argv' defaults to `int'" warnings, and I'm not sure if leaving out the types could cause problems on platforms where an int and a char** aren't of the same size. -Christian
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 01 Jan 2006 23:45:52 +0000
parents 355632dca928
children
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<HTML
><HEAD
><TITLE
>SDL_CreateRGBSurface</TITLE
><META
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><H1
><A
NAME="SDLCREATERGBSURFACE"
></A
>SDL_CreateRGBSurface</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN1773"
></A
><H2
>Name</H2
>SDL_CreateRGBSurface&nbsp;--&nbsp;Create an empty SDL_Surface</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN1776"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><A
NAME="AEN1777"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>SDL_Surface *<B
CLASS="FSFUNC"
>SDL_CreateRGBSurface</B
></CODE
>(Uint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1783"
></A
><H2
>Description</H2
><P
>Allocate an empty surface (must be called after <A
HREF="sdlsetvideomode.html"
>SDL_SetVideoMode</A
>)</P
><P
>If <TT
CLASS="PARAMETER"
><I
>depth</I
></TT
> is 8 bits an empty palette is allocated for the surface, otherwise a 'packed-pixel' <A
HREF="sdlpixelformat.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_PixelFormat</SPAN
></A
> is created using the <TT
CLASS="PARAMETER"
><I
>[RGBA]mask</I
></TT
>'s provided (see <A
HREF="sdlpixelformat.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_PixelFormat</SPAN
></A
>). The <TT
CLASS="PARAMETER"
><I
>flags</I
></TT
> specifies the type of surface that should be created, it is an OR'd combination of the following possible values.</P
><DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN1795"
></A
><P
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>SDL_SWSURFACE</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>SDL will create the surface in system memory. This improves the performance of pixel level access, however you may not be able to take advantage of some types of hardware blitting.</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>SDL_HWSURFACE</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>SDL will attempt to create the surface in video memory. This will allow SDL to take advantage of Video-&#62;Video blits (which are often accelerated).</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>SDL_SRCCOLORKEY</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>This flag turns on colourkeying for blits from this surface. If
<TT
CLASS="LITERAL"
>SDL_HWSURFACE</TT
> is also specified and colourkeyed blits
are hardware-accelerated, then SDL will attempt to place the surface in
video memory.
Use <A
HREF="sdlsetcolorkey.html"
><TT
CLASS="FUNCTION"
>SDL_SetColorKey</TT
></A
>
to set or clear this flag after surface creation.</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="LITERAL"
>SDL_SRCALPHA</TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>This flag turns on alpha-blending for blits from this surface. If
<TT
CLASS="LITERAL"
>SDL_HWSURFACE</TT
> is also specified and alpha-blending blits
are hardware-accelerated, then the surface will be placed in video memory if
possible.
Use <A
HREF="sdlsetalpha.html"
><TT
CLASS="FUNCTION"
>SDL_SetAlpha</TT
></A
> to
set or clear this flag after surface creation.</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>If an alpha-channel is specified (that is, if <TT
CLASS="PARAMETER"
><I
>Amask</I
></TT
> is
nonzero), then the <TT
CLASS="LITERAL"
>SDL_SRCALPHA</TT
> flag is automatically
set. You may remove this flag by calling 
<A
HREF="sdlsetalpha.html"
><TT
CLASS="FUNCTION"
>SDL_SetAlpha</TT
></A
>
after surface creation.</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1826"
></A
><H2
>Return Value</H2
><P
>Returns the created surface, or <SPAN
CLASS="RETURNVALUE"
>NULL</SPAN
> upon error.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1830"
></A
><H2
>Example</H2
><PRE
CLASS="PROGRAMLISTING"
>    /* Create a 32-bit surface with the bytes of each pixel in R,G,B,A order,
       as expected by OpenGL for textures */
    SDL_Surface *surface;
    Uint32 rmask, gmask, bmask, amask;

    /* SDL interprets each pixel as a 32-bit number, so our masks must depend
       on the endianness (byte order) of the machine */
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
    rmask = 0xff000000;
    gmask = 0x00ff0000;
    bmask = 0x0000ff00;
    amask = 0x000000ff;
#else
    rmask = 0x000000ff;
    gmask = 0x0000ff00;
    bmask = 0x00ff0000;
    amask = 0xff000000;
#endif

    surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32,
                                   rmask, gmask, bmask, amask);
    if(surface == NULL) {
        fprintf(stderr, "CreateRGBSurface failed: %s\n", SDL_GetError());
        exit(1);
    }</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1833"
></A
><H2
>See Also</H2
><P
><A
HREF="sdlcreatergbsurfacefrom.html"
><TT
CLASS="FUNCTION"
>SDL_CreateRGBSurfaceFrom</TT
></A
>,
<A
HREF="sdlfreesurface.html"
><TT
CLASS="FUNCTION"
>SDL_FreeSurface</TT
></A
>,
<A
HREF="sdlsetvideomode.html"
><TT
CLASS="FUNCTION"
>SDL_SetVideoMode</TT
></A
>,
<A
HREF="sdllocksurface.html"
><TT
CLASS="FUNCTION"
>SDL_LockSurface</TT
></A
>,
<A
HREF="sdlpixelformat.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_PixelFormat</SPAN
></A
>,
<A
HREF="sdlsurface.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_Surface</SPAN
></A
>
<A
HREF="sdlsetalpha.html"
><TT
CLASS="FUNCTION"
>SDL_SetAlpha</TT
></A
>
<A
HREF="sdlsetcolorkey.html"
><TT
CLASS="FUNCTION"
>SDL_SetColorKey</TT
></A
></P
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