home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The Fred Fish Collection 1.5
/
ffcollection-1-5-1992-11.iso
/
ff_disks
/
200-299
/
ff274.lzh
/
Snap
/
patch.c
< prev
next >
Wrap
Text File
|
1989-11-16
|
2KB
|
48 lines
/* This patch is a quite ugly way to solve the problem
** that occurs when Intuition tries to draw something
** in a screen which has it's layers locked.
** The problem is solved by disabling dangerous functions.
** Some functions remain because they require more work.
** An example of this is OpenWindow(), since OpenWindow()
** can't be as easily ignored as the functions that ARE
** patched here. OpenWindow() would require some sort of
** semaphore locking and waiting - and so we're back where
** we started.
*/
IMPORT struct IntuitionBase *IntuitionBase;
IMPORT SHORT lvoActivateWindow, lvoWindowToFront, lvoWindowToBack;
VOID myActivateWindow(), myWindowToFront(), myWindowToBack();
LONG oldActivateWindow, oldWindowToFront, oldWindowToBack;
STATIC WORD patched = 0;
VOID SafePatch()
{
if (!patched) {
Forbid(); /* I don't expect interrupts to do much intuition */
oldActivateWindow =
SetFunction(IntuitionBase, (LONG)lvoActivateWindow, myActivateWindow);
oldWindowToFront =
SetFunction(IntuitionBase, (LONG)lvoWindowToFront, myWindowToFront);
oldWindowToBack =
SetFunction(IntuitionBase, (LONG)lvoWindowToBack, myWindowToBack);
Permit();
patched = 1;
}
}
VOID SafeRestore()
{
if (patched) {
Forbid();
(VOID)SetFunction(IntuitionBase, (LONG)lvoActivateWindow, oldActivateWindow);
(VOID)SetFunction(IntuitionBase, (LONG)lvoWindowToFront, oldWindowToFront);
(VOID)SetFunction(IntuitionBase, (LONG)lvoWindowToBack, oldWindowToBack);
Permit();
patched = 0;
}
}