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leland: optimise use of tilemap (nw)

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This commit is contained in:
Vas Crabb 2018-05-20 11:58:17 +10:00
parent 77ad3656e4
commit a3b446262d
1 changed files with 4 additions and 7 deletions
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11
src/mame/video/leland.cpp
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@ -445,8 +445,9 @@ READ8_MEMBER(ataxx_state::ataxx_svram_port_r)
uint32_t leland_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) uint32_t leland_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{ {
bitmap_ind16 const &src = m_tilemap->pixmap(); m_tilemap->set_scrollx(0, m_xscroll);
int const height_mask = m_tilemap->height() - 1; m_tilemap->set_scrolly(0, m_yscroll);
m_tilemap->draw(screen, bitmap, cliprect, 0);
/* for each scanline in the visible region */ /* for each scanline in the visible region */
for (int y = cliprect.min_y; y <= cliprect.max_y; y++) for (int y = cliprect.min_y; y <= cliprect.max_y; y++)
@ -457,12 +458,8 @@ uint32_t leland_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap
/* for each pixel on the scanline */ /* for each pixel on the scanline */
for (int x = cliprect.min_x; x <= cliprect.max_x; x++) for (int x = cliprect.min_x; x <= cliprect.max_x; x++)
{ {
/* compute the effective scrolled pixel coordinates */
uint16_t const sx = (x + m_xscroll) & 0x07ff;
uint16_t const sy = (y + m_yscroll) & height_mask;
/* build the pen, background is d0-d5 */ /* build the pen, background is d0-d5 */
pen_t pen = src.pix16(sy, sx) & 0x3f; pen_t pen = dst[x] & 0x3f;
/* foreground is d6-d9 */ /* foreground is d6-d9 */
if (x & 0x01) if (x & 0x01)