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ygv608.cpp: small changes

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This commit is contained in:
Agiri 2017-12-30 22:39:48 +09:00
parent 5563422a6c
commit d301a89fb2
1 changed files with 5 additions and 4 deletions
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9
src/mame/video/ygv608.cpp
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@ -1032,20 +1032,21 @@ inline void ygv608_device::draw_layer_roz(screen_device &screen, bitmap_ind16 &b
void ygv608_device::ygv608_draw_mosaic(bitmap_ind16 &bitmap, const rectangle &cliprect, int n)
{
int x, y, x0, y0;
int x, y, mask;
if (n <= 0)
{
return;
}
// mask to drop the lowest n-bits
mask = ~((1 << n) - 1);
for (y = cliprect.min_y; y <= cliprect.max_y; y++)
{
for (x = cliprect.min_x; x <= cliprect.max_x; x++)
{
x0 = (x >> n) << n;
y0 = (y >> n) << n;
bitmap.pix16(y, x) = bitmap.pix16(y0, x0);
bitmap.pix16(y, x) = bitmap.pix16(y & mask, x & mask);
}
}
}