/* gfx_gdi_lock:
*/
static void gfx_gdi_lock(struct BITMAP *bmp)
{
/* to prevent the drawing threads and the rendering proc
* from concurrently accessing the dirty lines array
*/
_enter_gfx_critical();
/* arrange for drawing requests to pause when we are in the background */
if (!_win_app_foreground) {
/* stop timer */
remove_int(render_proc);
_exit_gfx_critical();
if (GFX_CRITICAL_RELEASED)
_win_thread_switch_out();
_enter_gfx_critical();
/* restart timer */
install_int(render_proc, RENDER_DELAY);
}
lock_nesting++;
bmp->id |= BMP_ID_LOCKED;
}
/* gfx_directx_switch_out:
* Arranges for drawing requests to pause when we are in the background.
*/
static void gfx_directx_switch_out(void)
{
_exit_gfx_critical();
if (GFX_CRITICAL_RELEASED)
_win_thread_switch_out();
_enter_gfx_critical();
}
/* flip_with_forefront_bitmap:
* Worker function for DirectDraw page flipping.
*/
static int flip_with_forefront_bitmap(BITMAP *bmp, int wait)
{
DDRAW_SURFACE *surf;
HRESULT hr;
/* flip only in the foreground */
if (!_win_app_foreground) {
_win_thread_switch_out();
return 0;
}
/* retrieve the underlying surface */
surf = DDRAW_SURFACE_OF(bmp);
if (surf == flipping_page[0])
return 0;
ASSERT((surf == flipping_page[1]) || (surf == flipping_page[2]));
/* flip the contents of the surfaces */
hr = IDirectDrawSurface2_Flip(flipping_page[0]->id, surf->id, wait ? DDFLIP_WAIT : 0);
/* if the surface has been lost, try to restore all surfaces */
if (hr == DDERR_SURFACELOST) {
if (restore_all_ddraw_surfaces() == 0)
hr = IDirectDrawSurface2_Flip(flipping_page[0]->id, surf->id, wait ? DDFLIP_WAIT : 0);
}
if (FAILED(hr)) {
_TRACE(PREFIX_E "Can't flip (%s)\n", dd_err(hr));
return -1;
}
/* attach the surface to the former forefront bitmap */
surf->parent_bmp = flipping_page[0]->parent_bmp;
surf->parent_bmp->extra = surf;
/* make the bitmap point to the forefront surface */
flipping_page[0]->parent_bmp = bmp;
bmp->extra = flipping_page[0];
return 0;
}