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vt100: Fix crash (nw)

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This commit is contained in:
AJR 2018-01-01 14:07:41 -05:00
parent 98d179c578
commit a6cf00b0a4
1 changed files with 11 additions and 8 deletions
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19
src/mame/video/vtvideo.cpp
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@ -356,7 +356,8 @@ void vt100_video_device::display_char(bitmap_ind16 &bitmap, uint8_t code, int x,
int char_lines = m_linedoubler ? 20 : 10;
for (int i = 0; i < char_lines; i++)
{
int yy = y * 10 + i;
int yy = y * char_lines + i;
assert(yy < bitmap.height());
switch (display_type)
{
@ -429,15 +430,19 @@ void vt100_video_device::video_update(bitmap_ind16 &bitmap, const rectangle &cli
return;
int vert_charlines_MAX = m_height;
int fill_lines = m_fill_lines;
if (m_linedoubler)
{
vert_charlines_MAX *= 2;
fill_lines *= 2;
}
while (line < vert_charlines_MAX)
{
code = m_read_ram(addr + xpos);
if (code == 0x7f)
{
// end of line, fill empty till end of line
if (line >= m_fill_lines)
if (line >= fill_lines)
{
for (x = xpos; x < ((display_type == 2) ? (m_columns / 2) : m_columns); x++)
{
@ -451,19 +456,17 @@ void vt100_video_device::video_update(bitmap_ind16 &bitmap, const rectangle &cli
if (addr & 0x1000) addr &= 0xfff; else addr |= 0x2000;
scroll_region = (temp >> 15) & 1;
display_type = (temp >> 13) & 3;
if (line >= m_fill_lines)
{
if (line >= fill_lines)
ypos++;
if (m_linedoubler)
ypos++;
}
xpos = 0;
line++;
if (m_linedoubler)
line++;
}
else
{
// display regular char
if (line >= m_fill_lines)
if (line >= fill_lines)
{
display_char(bitmap, code, xpos, ypos, scroll_region, display_type);
}