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Date: 28 Jun 2003 22:42:52 +0100 From: Alan Swanson Subject: Re: [SDL] New XFree 4.3 Video Mode Patch I have a wee amendment that moves the qsort in set_best_resolution to only occur after failing to find an exact match only. This would make absolutely sure we get a user set mode. While I've never had any problems for my normal resolutions (1280x1024, 1024x768, 800x600 & 640,480) while closely examining the output from qsort I've noticed it doesn't seem to sort the modes fully. These is one definite wrong at 1152x768 and a few that just look wrong to me. From a program (attached) I made to examine this more easily. X has sorted its mode list using the same method as ours (plus frequency), and our user modes get inserted without any other movement. On the patch I've made I've also changed cmpmodes to sort on vertical resolution and then horizontal. Ie vertical is now most significant bit.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 28 Jun 2003 21:52:26 +0000
parents e5bc29de3f0a
children 355632dca928
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<HTML
><HEAD
><TITLE
>SDL_keysym</TITLE
><META
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><HR
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><H1
><A
NAME="SDLKEYSYM"
>SDL_keysym</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN4275"
></A
><H2
>Name</H2
>SDL_keysym&nbsp;--&nbsp;Keysym structure</DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4278"
></A
><H2
>Structure Definition</H2
><PRE
CLASS="PROGRAMLISTING"
>typedef struct{
  Uint8 scancode;
  SDLKey sym;
  SDLMod mod;
  Uint16 unicode;
} SDL_keysym;</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4281"
></A
><H2
>Structure Data</H2
><DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN4283"
></A
><P
></P
><TABLE
BORDER="0"
CLASS="CALSTABLE"
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="STRUCTFIELD"
><I
>scancode</I
></TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Hardware specific scancode</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="STRUCTFIELD"
><I
>sym</I
></TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>SDL virtual keysym</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="STRUCTFIELD"
><I
>mod</I
></TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Current key modifiers</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="STRUCTFIELD"
><I
>unicode</I
></TT
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>Translated character</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4302"
></A
><H2
>Description</H2
><P
>The <SPAN
CLASS="STRUCTNAME"
>SDL_keysym</SPAN
> structure is used by reporting key presses and releases since it is a part of the <A
HREF="sdlkeyboardevent.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_KeyboardEvent</SPAN
></A
>.</P
><P
>The <TT
CLASS="STRUCTFIELD"
><I
>scancode</I
></TT
> field should generally be left alone, it is the hardware dependent scancode returned by the keyboard. The <TT
CLASS="STRUCTFIELD"
><I
>sym</I
></TT
> field is extremely useful. It is the SDL-defined value of the key (see <A
HREF="sdlkey.html"
>SDL Key Syms</A
>. This field is very useful when you are checking for certain key presses, like so:
<PRE
CLASS="PROGRAMLISTING"
>.
.
while(SDL_PollEvent(&#38;event)){
  switch(event.type){
    case SDL_KEYDOWN:
      if(event.key.keysym.sym==SDLK_LEFT)
        move_left();
      break;
    .
    .
    .
  }
}
.
.</PRE
>
<TT
CLASS="STRUCTFIELD"
><I
>mod</I
></TT
> stores the current state of the keyboard modifiers as explained in <A
HREF="sdlgetmodstate.html"
><TT
CLASS="FUNCTION"
>SDL_GetModState</TT
></A
>. The <TT
CLASS="STRUCTFIELD"
><I
>unicode</I
></TT
> is only used when UNICODE translation is enabled with <A
HREF="sdlenableunicode.html"
><TT
CLASS="FUNCTION"
>SDL_EnableUNICODE</TT
></A
>. If <TT
CLASS="STRUCTFIELD"
><I
>unicode</I
></TT
> is non-zero then this a the UNICODE character corresponding to the keypress. If the high 9 bits of the character are 0, then this maps to the equivalent ASCII character:
<PRE
CLASS="PROGRAMLISTING"
>char ch;
if ( (keysym.unicode &#38; 0xFF80) == 0 ) {
  ch = keysym.unicode &#38; 0x7F;
}
else {
  printf("An International Character.\n");
}</PRE
>
UNICODE translation does have a slight overhead so don't enable it unless its needed.</P
></DIV
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><A
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></A
><H2
>See Also</H2
><P
><A
HREF="sdlkey.html"
><SPAN
CLASS="STRUCTNAME"
>SDLKey</SPAN
></A
></P
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