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x68k_crtc: fix visarea

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This commit is contained in:
cracyc 2021-05-26 21:17:09 -05:00
parent 37e85b4518
commit 3ade0ad948
1 changed files with 3 additions and 13 deletions
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16
src/mame/video/x68k_crtc.cpp
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@ -175,19 +175,9 @@ void x68k_crtc_device::refresh_mode()
scr.max_x = m_hend + 2;
rectangle visiblescr(m_hbegin, m_hend, m_vbegin, m_vend);
// expand visible area to the size indicated by CRTC reg 20
int length = m_hend - m_hbegin;
if (length < m_width)
{
visiblescr.min_x = m_hbegin - ((m_width - length)/2);
visiblescr.max_x = m_hend + ((m_width - length)/2);
}
length = m_vend - m_vbegin;
if (length < m_height)
{
visiblescr.min_y = m_vbegin - ((m_height - length)/2);
visiblescr.max_y = m_vend + ((m_height - length)/2);
}
if ((visiblescr.max_y > m_height) || (visiblescr.max_x > m_width))
logerror("visarea larger then reg[20]: %dx%d, %dx%d", visiblescr.max_x, visiblescr.max_y, m_width, m_height);
// bounds check
if (visiblescr.min_x < 0)
visiblescr.min_x = 0;