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Club Amiga de Montreal - CAM
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365.lha
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patch.c
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1990-04-10
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2KB
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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;
}
}