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Mac Mania 6
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MacMania 6.toast
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Multimedia & Desktop
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VideoToolbox
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VideoToolboxSources
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TrapAvailable.c
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1997-03-02
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858b
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42 lines
/*
TrapAvailable.c
From Apple. Simply include <Traps.h> in your program and call this routine to find
out whether any particular trap is available.
*/
#include "VideoToolbox.h"
#ifndef __TRAPS__
#include <Traps.h>
#endif
// these are for internal use only
short NumToolboxTraps(void);
TrapType GetTrapType(short theTrap);
Boolean TrapAvailable(short theTrap)
{
TrapType tType;
tType=GetTrapType(theTrap);
if(tType==ToolTrap){
theTrap &= 0x07FF;
if(theTrap>=NumToolboxTraps())theTrap=_Unimplemented;
}
return NGetTrapAddress(theTrap,tType) != NGetTrapAddress(_Unimplemented,ToolTrap);
}
short NumToolboxTraps(void)
{
if (NGetTrapAddress(_InitGraf,ToolTrap)==NGetTrapAddress(0xAA6E,ToolTrap))
return 0x0200;
else return 0x0400;
}
TrapType GetTrapType(short theTrap)
{
if((theTrap & 0x0800)>0) return ToolTrap;
else return OSTrap;
}