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Minor cleanups (nw)

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This commit is contained in:
Nathan Woods 2012-12-28 12:43:03 +00:00
parent 0ccf16d9ce
commit 60915fea12
1 changed files with 19 additions and 9 deletions
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28
src/mess/video/mc6847.h
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@ -547,19 +547,29 @@ private:
void change_mode(UINT8 mode, int state)
{
/* sanity check, to ensure that we're not changing fixed modes */
// sanity check, to ensure that we're not changing fixed modes
assert((mode & m_fixed_mode_mask) == 0);
if (!m_dirty)
{
video_flush();
m_dirty = true;
}
// calculate new mode
UINT8 new_mode;
if (state)
m_mode |= mode;
new_mode = m_mode | mode;
else
m_mode &= ~mode;
new_mode = m_mode & ~mode;
// has the mode changed?
if (new_mode != m_mode)
{
// it has! check dirty flag
if (!m_dirty)
{
video_flush();
m_dirty = true;
}
// and set the new mode
m_mode = new_mode;
}
}
// setup functions