static void update_smoothing(int bgtilerow, int first, int last)
{
UINT8 *prom = memory_region(REGION_PROMS) + smooth_table * 0x100;
UINT8 bgscan[2][256];
UINT8 *bgcurr = bgscan[0], *bglast = bgscan[1];
int xstart, xstop, x, y;
/*
smoothing notes:
* even scanlines blend the previous (Y-1) and current (Y) line
* odd scanlines are just taken from the current line (Y)
* therefore, if we modify source scanlines 8-15, we must update dest scanlines 16-32
* even pixels are just taken from the current pixel (X)
* odd pixels blend the current (X) and next (X+1) pixels
* therefore, if we modify source pixels 8-15, we must update dest pixels 15-31
*/
/* compute x start/stop in destination coordinates */
xstart = first * 16 - 1;
xstop = last * 16 + 15;
/* extract the previous bg scanline */
extract_scanline8(bgbitmap, 0, ((bgtilerow * 16 - 1) & 0x1ff) / 2, 256, bgcurr);
/* loop over height */
for (y = 0; y <= 16; y++)
{
int curry = (bgtilerow * 16 + y) & 0x1ff;
/* swap background buffers */
UINT8 *bgtemp = bgcurr;
bgcurr = bglast;
bglast = bgtemp;
/* extract current bg scanline */
extract_scanline8(bgbitmap, 0, curry / 2, 256, bgcurr);
/* loop over columns */
for (x = xstart; x <= xstop; x++)
{
int tr = bglast[((x + 1) & 0x1ff) / 2];
int br = bgcurr[((x + 1) & 0x1ff) / 2];
/* smooth pixels */
if (x & 1)
{
int tl = bglast[(x & 0x1ff) / 2];
int bl = bgcurr[(x & 0x1ff) / 2];
int mixt = prom[16 * tl + tr];
int mixb = prom[16 * bl + br];
plot_pixel(bgexbitmap, x & 0x1ff, curry, prom[0x400 + 16 * mixt + mixb]);
}
else
plot_pixel(bgexbitmap, x & 0x1ff, curry, prom[0x400 + 16 * tr + br]);
}
}
}
void apexc_state::apexc_teletyper_linefeed()
{
UINT8 buf[teletyper_window_width];
int y;
for (y=teletyper_window_offset_y; y<teletyper_window_offset_y+teletyper_window_height-teletyper_scroll_step; y++)
{
extract_scanline8(*m_bitmap, teletyper_window_offset_x, y+teletyper_scroll_step, teletyper_window_width, buf);
draw_scanline8(*m_bitmap, teletyper_window_offset_x, y, teletyper_window_width, buf, m_palette->pens());
}
m_bitmap->fill(0, teletyper_scroll_clear_window);
}
static void pdp1_typewriter_linefeed(void)
{
UINT8 buf[typewriter_window_width];
int y;
for (y=0; y<typewriter_window_height-typewriter_scroll_step; y++)
{
extract_scanline8(typewriter_bitmap, 0, y+typewriter_scroll_step, typewriter_window_width, buf);
draw_scanline8(typewriter_bitmap, 0, y, typewriter_window_width, buf, Machine->pens, -1);
}
fillbitmap(typewriter_bitmap, Machine->pens[pen_typewriter_bg], &typewriter_scroll_clear_window);
}
void tx0_state::tx0_typewriter_linefeed()
{
UINT8 buf[typewriter_window_width];
int y;
for (y=0; y<typewriter_window_height-typewriter_scroll_step; y++)
{
extract_scanline8(m_typewriter_bitmap, 0, y+typewriter_scroll_step, typewriter_window_width, buf);
draw_scanline8(m_typewriter_bitmap, 0, y, typewriter_window_width, buf, m_palette->pens());
}
const rectangle typewriter_scroll_clear_window(0, typewriter_window_width-1, typewriter_window_height-typewriter_scroll_step, typewriter_window_height-1);
m_typewriter_bitmap.fill(pen_typewriter_bg, typewriter_scroll_clear_window);
}
static void tx0_typewriter_linefeed(running_machine &machine)
{
tx0_state *state = machine.driver_data<tx0_state>();
UINT8 buf[typewriter_window_width];
int y;
for (y=0; y<typewriter_window_height-typewriter_scroll_step; y++)
{
extract_scanline8(state->m_typewriter_bitmap, 0, y+typewriter_scroll_step, typewriter_window_width, buf);
draw_scanline8(state->m_typewriter_bitmap, 0, y, typewriter_window_width, buf, machine.pens);
}
const rectangle typewriter_scroll_clear_window(0, typewriter_window_width-1, typewriter_window_height-typewriter_scroll_step, typewriter_window_height-1);
state->m_typewriter_bitmap.fill(pen_typewriter_bg, typewriter_scroll_clear_window);
}
