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Feature #7962: Improve rendering of large viewports

This commit is contained in:
dP 2020-02-15 01:10:04 +03:00 committed by Patric Stout
parent 5ca8a0bda9
commit e82333cf77
1 changed files with 6 additions and 27 deletions
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33
src/viewport.cpp
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@ -1782,32 +1782,6 @@ void ViewportDoDraw(const Viewport *vp, int left, int top, int right, int bottom
_vd.child_screen_sprites_to_draw.clear();
}
/**
* Make sure we don't draw a too big area at a time.
* If we do, the sprite memory will overflow.
*/
static void ViewportDrawChk(const Viewport *vp, int left, int top, int right, int bottom)
{
if ((int64)ScaleByZoom(bottom - top, vp->zoom) * (int64)ScaleByZoom(right - left, vp->zoom) > (int64)(180000 * ZOOM_LVL_BASE * ZOOM_LVL_BASE)) {
if ((bottom - top) > (right - left)) {
int t = (top + bottom) >> 1;
ViewportDrawChk(vp, left, top, right, t);
ViewportDrawChk(vp, left, t, right, bottom);
} else {
int t = (left + right) >> 1;
ViewportDrawChk(vp, left, top, t, bottom);
ViewportDrawChk(vp, t, top, right, bottom);
}
} else {
ViewportDoDraw(vp,
ScaleByZoom(left - vp->left, vp->zoom) + vp->virtual_left,
ScaleByZoom(top - vp->top, vp->zoom) + vp->virtual_top,
ScaleByZoom(right - vp->left, vp->zoom) + vp->virtual_left,
ScaleByZoom(bottom - vp->top, vp->zoom) + vp->virtual_top
);
}
}
static inline void ViewportDraw(const Viewport *vp, int left, int top, int right, int bottom)
{
if (right <= vp->left || bottom <= vp->top) return;
@ -1822,7 +1796,12 @@ static inline void ViewportDraw(const Viewport *vp, int left, int top, int right
if (top < vp->top) top = vp->top;
if (bottom > vp->top + vp->height) bottom = vp->top + vp->height;
ViewportDrawChk(vp, left, top, right, bottom);
ViewportDoDraw(vp,
ScaleByZoom(left - vp->left, vp->zoom) + vp->virtual_left,
ScaleByZoom(top - vp->top, vp->zoom) + vp->virtual_top,
ScaleByZoom(right - vp->left, vp->zoom) + vp->virtual_left,
ScaleByZoom(bottom - vp->top, vp->zoom) + vp->virtual_top
);
}
/**