The Apple Media Tool and Apple Media Tool Programming Environment products have been discontinued.
For more information check out: AMT/PE Discontinued.
Q: Why do AMT/PE 1.2 applications occasionally freeze during screen switching?
A: This is caused by the Apple Media Kit calling SetCCursor during a VBL task,
which can move memory. While this didn't cause problems on earlier models (even
on those with the PowerPC 601 chip), it frequently causes problems on PowerPC
604-based systems. This may be because VM is on by default. We do not think it
has anything to do with the hardware.
A replacement cursor.c file has been provided in the Apple Media
Tool/Programming Environment Runtime folder, and we do have a replacement
Runtime Maker:Codes:Program file for Apple Media Tool. If you are currently
developing titles, replacing these files and rebuilding your projects will
remove the bug.
For existing titles, we have an applet (titled AMK Launch'NPlay) that you can
distribute to any of your customers who report this problem. Instruct the
customer to launch AMK Launch'NPlayand navigate to the title (what they would
ordinarily double click on) in the dialog box presented. The title will be
launched and not crash as before. (Spinning cursors will not be drawn,
however.)
Here is the code you need for cursor.c.
/*
File: CURSOR.c
Folder: RUNTIME
(c) Encore Développement, SARL, 1992-94
*/
#include "Memory.h"
#include "QuickDraw.h"
#include "Retrace.h"
#include "Key.h"
extern const keyID K_DATA;
extern const keyID K_ID;
extern const keyID K_COUNT;
extern const keyID K_GETAT;
void CursorLoad(key* the)
{
short anID;
CCrsrHandle aCCrsrHandle;
anID = keyToInteger(keyGet(the[SELF], K_ID));
aCCrsrHandle = GetCCursor(anID);
keyIfNULL(aCCrsrHandle);
keyPut(the[SELF], K_DATA, keyFromHandle(aCCrsrHandle));
}
void CursorSet(key* the)
{
CCrsrHandle aCCrsrHandle;
aCCrsrHandle = (CCrsrHandle)keyToHandle(keyGet(the[SELF], K_DATA));
keyCheck(aCCrsrHandle != NULL);
SetCCursor(aCCrsrHandle);
}
void CursorUnload(key* the)
{
CCrsrHandle aCCrsrHandle;
aCCrsrHandle = (CCrsrHandle)keyToHandle(keyGet(the[SELF], K_DATA));
keyCheck(aCCrsrHandle != NULL);
DisposCCursor(aCCrsrHandle);
keyPut(the[SELF], K_DATA, keyVoid);
}
typedef struct {
#ifdef applec
long globalA5;
long localA5;
#endif
VBLTask task;
short running;
short index;
short count;
CCrsrPtr cursors[64];
} SpinRecord, *SpinPtr;
SpinRecord gSpinRecord;
#ifdef applec
pascal long GetA0() = { 0x2e88 };
pascal long GetA5() = { 0x2e8d };
#endif
pascal void SpinVBLTask()
{
#ifdef applec
SpinPtr aSpinPtr = (SpinPtr)(GetA0() - (sizeof(long) * 2));
aSpinPtr->localA5 = SetA5(aSpinPtr->globalA5);
#endif
#ifdef powerc
SpinPtr aSpinPtr = &gSpinRecord;
#endif
aSpinPtr->task.vblCount = 10;
aSpinPtr->index++;
if (aSpinPtr->index == aSpinPtr->count) {
aSpinPtr->index = 0;
}
/*
Use the b&w cursor inside the locked color cursor handle
so it does not move memory...
*/
SetCursor((Cursor*)&((aSpinPtr->cursors[aSpinPtr->index])->crsr1Data));
#ifdef applec
SetA5(aSpinPtr->localA5);
#endif
}
void SpinIsRunning(key* the)
{
the[RESULT] = keyFromBoolean(gSpinRecord.running);
}
void SpinStart(key* the)
{
static VBLUPP aVBLUPP = NULL;
short aCount, anIndex;
Handle aHandle;
if (aVBLUPP == NULL) {
aVBLUPP = NewVBLProc(SpinVBLTask);
}
aCount = keyToInteger(keyCall0(the[SELF], K_COUNT));
for (anIndex = 0; anIndex < aCount; anIndex++) {
the[RESULT] = keyCall1(the[SELF], K_GETAT, keyFromInteger(anIndex + 1));
aHandle = keyToHandle(keyGet(the[RESULT], K_DATA));
HLock(aHandle);
gSpinRecord.cursors[anIndex] = (CCrsrPtr)*aHandle;
}
#ifdef applec
gSpinRecord.globalA5 = GetA5();
#endif
gSpinRecord.task.qType = vType;
gSpinRecord.task.vblAddr = aVBLUPP;
gSpinRecord.task.vblCount = 10;
gSpinRecord.task.vblPhase = 0;
gSpinRecord.index = 0;
gSpinRecord.count = aCount;
if (VInstall((QElemPtr)&(gSpinRecord.task)) == noErr) {
gSpinRecord.running = 1;
}
}
void SpinStop(key* the)
{
short aCount, anIndex;
Handle aHandle;
if (VRemove((QElemPtr)&(gSpinRecord.task)) == noErr) {
gSpinRecord.running = 0;
}
aCount = keyToInteger(keyCall0(the[SELF], K_COUNT));
for (anIndex = 0; anIndex < aCount; anIndex++) {
the[RESULT] = keyCall1(the[SELF], K_GETAT, keyFromInteger(anIndex + 1));
aHandle = keyToHandle(keyGet(the[RESULT], K_DATA));
HUnlock(aHandle);
gSpinRecord.cursors[anIndex] = NULL;
}
}
void CursorsShow(key *the)
{
if (keyIsTrue(the[ARGUMENT(1)]))
ShowCursor();
else
HideCursor();
}
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