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Debugger: ported "smart scrolling" from an obscure version of FCEUXD 1.1

This commit is contained in:
ansstuff 2013-03-14 15:40:52 +00:00
parent 9d778993b7
commit d748d3219c
1 changed files with 33 additions and 1 deletions
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34
src/drivers/win/debugger.cpp
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@ -1242,6 +1242,38 @@ void LoadGameDebuggerData(HWND hwndDlg = hDebug)
FillBreakList(hwndDlg);
}
// This function is for "smart" scrolling...
// it attempts to scroll up one line by a whole instruction
int InstructionUp(int from)
{
int i = std::min(16, from), j;
while (i > 0)
{
j = i;
while (j > 0)
{
if (GetMem(from - j) == 0x00)
break; // BRK usually signifies data
if (opsize[GetMem(from - j)] == 0)
break; // invalid instruction!
if (opsize[GetMem(from - j)] > j)
break; // instruction is too long!
if (opsize[GetMem(from - j)] == j)
return (from - j); // instruction is just right! :D
j -= opsize[GetMem(from - j)];
}
i--;
}
// if we get here, no suitable instruction was found
if ((from >= 2) && (GetMem(from - 2) == 0x00))
return (from - 2); // if a BRK instruction is possible, use that
if (from)
return (from - 1); // else, scroll up one byte
return 0; // of course, if we can't scroll up, just return 0!
}
BOOL CALLBACK IDC_DEBUGGER_DISASSEMBLY_WndProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch(uMsg)
@ -1565,7 +1597,7 @@ BOOL CALLBACK DebuggerCallB(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lPara
case SB_ENDSCROLL:
case SB_TOP:
case SB_BOTTOM: break;
case SB_LINEUP: si.nPos--; break;
case SB_LINEUP: si.nPos = InstructionUp(si.nPos); break; // si.nPos--; break;
case SB_LINEDOWN:
if ((tmp=opsize[GetMem(si.nPos)])) si.nPos+=tmp;
else si.nPos++;