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SDL2: Update whole window surface if >= 80% needs updating

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This commit is contained in:
Jonathan G Rennison
2020-10-05 21:03:47 +01:00
parent bd2649c19e
commit 1298f49be6
1 changed files with 12 additions and 1 deletions
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13
src/video/sdl2_v.cpp
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@@ -373,7 +373,18 @@ static void DrawSurfaceToScreen()
_num_dirty_rects = 0;
if (n > MAX_DIRTY_RECTS) {
bool update_whole_screen = n > MAX_DIRTY_RECTS;
if (!update_whole_screen) {
int area = 0;
for (int i = 0; i < n; i++) {
area += _dirty_rects[i].w * _dirty_rects[i].h;
}
// Rectangles cover more than 80% of screen area, just do the whole screen
if ((area * 5) / 4 >= _sdl_surface->w * _sdl_surface->h) update_whole_screen = true;
}
if (update_whole_screen) {
if (_sdl_surface != _sdl_realscreen) {
SDL_BlitSurface(_sdl_surface, nullptr, _sdl_realscreen, nullptr);
}