UINT32 mc6845_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
assert(bitmap.valid());
if (m_has_valid_parameters)
{
assert(!m_update_row_cb.isnull());
/* call the set up function if any */
if (!m_begin_update_cb.isnull())
m_begin_update_cb(bitmap, cliprect);
if (cliprect.min_y == 0)
{
/* read the start address at the beginning of the frame */
m_current_disp_addr = m_disp_start_addr;
}
/* for each row in the visible region */
for (UINT16 y = cliprect.min_y; y <= cliprect.max_y; y++)
{
this->draw_scanline(y, bitmap, cliprect);
}
/* call the tear down function if any */
if (!m_end_update_cb.isnull())
m_end_update_cb(bitmap, cliprect);
}
else
{
if (LOG) logerror("M6845: Invalid screen parameters - display disabled!!!\n");
}
return 0;
}
UINT32 crtc_ega_device::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
assert(bitmap.valid());
if (m_has_valid_parameters)
{
UINT16 y;
assert(!m_row_update_cb.isnull());
/* call the set up function if any */
if (!m_begin_update_cb.isnull())
m_begin_update_cb(bitmap, cliprect);
if (cliprect.min_y == 0)
{
/* read the start address at the beginning of the frame */
m_current_disp_addr = m_disp_start_addr;
}
/* for each row in the visible region */
for (y = cliprect.min_y; y <= cliprect.max_y; y++)
{
/* compute the current raster line */
UINT8 ra = y % (m_max_ras_addr + 1);
/* check if the cursor is visible and is on this scanline */
int cursor_visible = m_cursor_state &&
(ra >= (m_cursor_start_ras & 0x1f)) &&
( (ra <= (m_cursor_end_ras & 0x1f)) || ((m_cursor_end_ras & 0x1f) == 0x00 )) &&
(m_cursor_addr >= m_current_disp_addr) &&
(m_cursor_addr < (m_current_disp_addr + ( m_horiz_disp + 1 )));
/* compute the cursor X position, or -1 if not visible */
INT8 cursor_x = cursor_visible ? (m_cursor_addr - m_current_disp_addr) : -1;
/* call the external system to draw it */
m_row_update_cb(bitmap, cliprect, m_current_disp_addr, ra, y, m_horiz_disp + 1, cursor_x);
/* update MA if the last raster address */
if (ra == m_max_ras_addr)
m_current_disp_addr = (m_current_disp_addr + m_horiz_disp + 1) & 0xffff;
}
/* call the tear down function if any */
if (!m_end_update_cb.isnull())
m_end_update_cb(bitmap, cliprect);
}
else
logerror("Invalid crtc_ega screen parameters - display disabled!!!\n");
return 0;
}
