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screen.c: remove redundant checks from update_partial() (nw)

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This commit is contained in:
Alex W. Jackson 2014-05-20 08:24:36 +00:00
parent b7680d9e46
commit 9c6c6278e6
1 changed files with 26 additions and 39 deletions
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35
src/emu/screen.c
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@ -566,42 +566,31 @@ bool screen_device::update_partial(int scanline)
}
// skip if we already rendered this line
if (scanline == m_last_partial_scan - 1)
if (scanline < m_last_partial_scan)
{
LOG_PARTIAL_UPDATES(("skipped because line was already rendered\n"));
return false;
}
// skip if outside of visible area
if (scanline < visible_area().min_y || scanline > visible_area().max_y)
{
LOG_PARTIAL_UPDATES(("skipped because outside of visible area\n"));
return false;
}
// skip if less than the lowest so far
if (scanline < m_last_partial_scan)
{
LOG_PARTIAL_UPDATES(("skipped because less than previous\n"));
return false;
}
// set the start/end scanlines
// set the range of scanlines to render
rectangle clip = m_visarea;
if (m_last_partial_scan > clip.min_y)
clip.min_y = m_last_partial_scan;
if (scanline < clip.max_y)
clip.max_y = scanline;
// render if necessary
bool result = false;
if (clip.min_y <= clip.max_y)
// skip if entirely outside of visible area
if (clip.min_y > clip.max_y)
{
UINT32 flags = UPDATE_HAS_NOT_CHANGED;
LOG_PARTIAL_UPDATES(("skipped because outside of visible area\n"));
return false;
}
g_profiler.start(PROFILER_VIDEO);
// otherwise, render
LOG_PARTIAL_UPDATES(("updating %d-%d\n", clip.min_y, clip.max_y));
g_profiler.start(PROFILER_VIDEO);
UINT32 flags = UPDATE_HAS_NOT_CHANGED;
screen_bitmap &curbitmap = m_bitmap[m_curbitmap];
switch (curbitmap.format())
{
@ -615,12 +604,10 @@ bool screen_device::update_partial(int scanline)
// if we modified the bitmap, we have to commit
m_changed |= ~flags & UPDATE_HAS_NOT_CHANGED;
result = true;
}
// remember where we left off
m_last_partial_scan = scanline + 1;
return result;
return true;
}