void sdlwindow_blit_surface_size(sdl_window_info *window, int window_width, int window_height)
{
INT32 newwidth, newheight;
int xscale = 1, yscale = 1;
float desired_aspect = 1.0f;
INT32 target_width = window_width;
INT32 target_height = window_height;
// start with the minimum size
window->target->compute_minimum_size(newwidth, newheight);
// compute the appropriate visible area if we're trying to keepaspect
if (video_config.keepaspect)
{
// make sure the monitor is up-to-date
sdlvideo_monitor_refresh(window->monitor);
window->target->compute_visible_area(target_width, target_height, sdlvideo_monitor_get_aspect(window->monitor), window->target->orientation(), target_width, target_height);
desired_aspect = (float)target_width / (float)target_height;
}
// non-integer scaling - often gives more pleasing results in full screen
if (!video_config.fullstretch)
{
// compute maximum integral scaling to fit the window
xscale = (target_width + 2) / newwidth;
yscale = (target_height + 2) / newheight;
// try a little harder to keep the aspect ratio if desired
if (video_config.keepaspect)
{
// if we could stretch more in the X direction, and that makes a better fit, bump the xscale
while (newwidth * (xscale + 1) <= window_width &&
better_mode(newwidth * xscale, newheight * yscale, newwidth * (xscale + 1), newheight * yscale, desired_aspect))
xscale++;
// if we could stretch more in the Y direction, and that makes a better fit, bump the yscale
while (newheight * (yscale + 1) <= window_height &&
better_mode(newwidth * xscale, newheight * yscale, newwidth * xscale, newheight * (yscale + 1), desired_aspect))
yscale++;
// now that we've maxed out, see if backing off the maximally stretched one makes a better fit
if (window_width - newwidth * xscale < window_height - newheight * yscale)
{
while (better_mode(newwidth * xscale, newheight * yscale, newwidth * (xscale - 1), newheight * yscale, desired_aspect) && (xscale >= 0))
xscale--;
}
else
{
while (better_mode(newwidth * xscale, newheight * yscale, newwidth * xscale, newheight * (yscale - 1), desired_aspect) && (yscale >= 0))
yscale--;
}
}
// ensure at least a scale factor of 1
if (xscale <= 0) xscale = 1;
if (yscale <= 0) yscale = 1;
// apply the final scale
newwidth *= xscale;
newheight *= yscale;
}
else
{
newwidth = target_width;
newheight = target_height;
}
//FIXME: really necessary to distinguish for yuv_modes ?
if (window->target->zoom_to_screen()
&& (video_config.scale_mode == VIDEO_SCALE_MODE_NONE ))
newwidth = window_width;
if ((window->blitwidth != newwidth) || (window->blitheight != newheight))
sdlwindow_clear(window);
window->blitwidth = newwidth;
window->blitheight = newheight;
}
static void compute_blit_surface_size(win_window_info *window)
{
dd_info *dd = window->drawdata;
INT32 newwidth, newheight;
int xscale, yscale;
RECT client;
// start with the minimum size
render_target_get_minimum_size(window->target, &newwidth, &newheight);
// get the window's client rectangle
GetClientRect(window->hwnd, &client);
// hardware stretch case: apply prescale
if (video_config.hwstretch)
{
int prescale = (video_config.prescale < 1) ? 1 : video_config.prescale;
// clamp the prescale to something smaller than the target bounds
xscale = prescale;
while (xscale > 1 && newwidth * xscale > rect_width(&client))
xscale--;
yscale = prescale;
while (yscale > 1 && newheight * yscale > rect_height(&client))
yscale--;
}
// non stretch case
else
{
INT32 target_width = rect_width(&client);
INT32 target_height = rect_height(&client);
float desired_aspect = 1.0f;
// compute the appropriate visible area if we're trying to keepaspect
if (video_config.keepaspect)
{
win_monitor_info *monitor = winwindow_video_window_monitor(window, NULL);
render_target_compute_visible_area(window->target, target_width, target_height, winvideo_monitor_get_aspect(monitor), render_target_get_orientation(window->target), &target_width, &target_height);
desired_aspect = (float)target_width / (float)target_height;
}
// compute maximum integral scaling to fit the window
xscale = (target_width + 2) / newwidth;
yscale = (target_height + 2) / newheight;
// try a little harder to keep the aspect ratio if desired
if (video_config.keepaspect)
{
// if we could stretch more in the X direction, and that makes a better fit, bump the xscale
while (newwidth * (xscale + 1) <= rect_width(&client) &&
better_mode(newwidth * xscale, newheight * yscale, newwidth * (xscale + 1), newheight * yscale, desired_aspect))
xscale++;
// if we could stretch more in the Y direction, and that makes a better fit, bump the yscale
while (newheight * (yscale + 1) <= rect_height(&client) &&
better_mode(newwidth * xscale, newheight * yscale, newwidth * xscale, newheight * (yscale + 1), desired_aspect))
yscale++;
// now that we've maxed out, see if backing off the maximally stretched one makes a better fit
if (rect_width(&client) - newwidth * xscale < rect_height(&client) - newheight * yscale)
{
while (xscale > 1 && better_mode(newwidth * xscale, newheight * yscale, newwidth * (xscale - 1), newheight * yscale, desired_aspect))
xscale--;
}
else
{
while (yscale > 1 && better_mode(newwidth * xscale, newheight * yscale, newwidth * xscale, newheight * (yscale - 1), desired_aspect))
yscale--;
}
}
}
// ensure at least a scale factor of 1
if (xscale == 0) xscale = 1;
if (yscale == 0) yscale = 1;
// apply the final scale
newwidth *= xscale;
newheight *= yscale;
if (newwidth != dd->blitwidth || newheight != dd->blitheight)
{
// force some updates
update_outer_rects(dd);
mame_printf_verbose("DirectDraw: New blit size = %dx%d\n", newwidth, newheight);
}
dd->blitwidth = newwidth;
dd->blitheight = newheight;
}
