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mc6847 : avoid one-time buffer underflow when fc100 is starting up.

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This commit is contained in:
Robbbert 2014-05-05 11:27:23 +00:00
parent 11986dff32
commit afc71643ab
1 changed files with 12 additions and 14 deletions
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26
src/emu/video/mc6847.c
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@ -856,7 +856,7 @@ UINT32 mc6847_base_device::screen_update(screen_device &screen, bitmap_rgb32 &bi
{
int base_x = 32;
int base_y = 25;
int x, x2, y;
int x, x2, y, width;
bool is_mc6847t1 = (type() == MC6847T1_NTSC) || (type() == MC6847T1_PAL);
int min_x = USE_HORIZONTAL_CLIP ? cliprect.min_x : 0;
int max_x = USE_HORIZONTAL_CLIP ? cliprect.max_x : (base_x * 2 + 256 - 1);
@ -887,7 +887,7 @@ UINT32 mc6847_base_device::screen_update(screen_device &screen, bitmap_rgb32 &bi
/* body */
x = 0;
int width = m_data[y].m_sample_count;
width = m_data[y].m_sample_count;
pixel_t *RESTRICT pixels = bitmap_addr(bitmap, base_y + y, base_x);
while(x < width)
{
@ -911,24 +911,22 @@ UINT32 mc6847_base_device::screen_update(screen_device &screen, bitmap_rgb32 &bi
}
/* right border */
for (x = base_x + 256; x <= max_x; x++)
{
*bitmap_addr(bitmap, y + base_y, x) = border_value(m_data[y].m_mode[width - 1], palette, is_mc6847t1);
}
if (width)
for (x = base_x + 256; x <= max_x; x++)
*bitmap_addr(bitmap, y + base_y, x) = border_value(m_data[y].m_mode[width - 1], palette, is_mc6847t1);
/* artifacting */
m_artifacter.process_artifacts<1>(bitmap_addr(bitmap, y + base_y, base_x), m_data[y].m_mode[0], palette);
}
width = m_data[191].m_sample_count;
/* bottom border */
for (y = base_y + 192; y <= max_y; y++)
{
for (x = min_x; x <= max_x; x++)
{
int width = m_data[191].m_sample_count;
*bitmap_addr(bitmap, y, x) = border_value(m_data[191].m_mode[width - 1], palette, is_mc6847t1);
}
}
if (width)
for (y = base_y + 192; y <= max_y; y++)
for (x = min_x; x <= max_x; x++)
*bitmap_addr(bitmap, y, x) = border_value(m_data[191].m_mode[width - 1], palette, is_mc6847t1);
return 0;
}