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[host] nvfbc: be more intellegent when unionizing disjointed sets
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@ -356,6 +356,8 @@ done:
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struct DisjointSet {
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int id;
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bool use;
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bool row;
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int x1;
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int y1;
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int x2;
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@ -377,9 +379,7 @@ static void dsUnion(struct DisjointSet * ds, int a, int b)
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return;
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ds[b].id = a;
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ds[a].x1 = min(ds[a].x1, ds[b].x1);
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ds[a].x2 = max(ds[a].x2, ds[b].x2);
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ds[a].y1 = min(ds[a].y1, ds[b].y1);
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ds[a].y2 = max(ds[a].y2, ds[b].y2);
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}
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@ -390,25 +390,93 @@ static void updateDamageRects(CaptureFrame * frame)
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struct DisjointSet ds[w * h];
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// init the ds usage
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for(unsigned int i = 0; i < ARRAY_LENGTH(ds); ++i)
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ds[i].use = (bool)this->diffMap[i];
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// reduce the number of reusuting rectangles by filling in holes and merging
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// iiregular shapes into contiguous rectangles
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bool resolve;
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do
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{
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resolve = false;
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for (unsigned int y = 0; y < h; ++y)
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for (unsigned int x = 0; x < w; ++x)
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if (this->diffMap[y * w + x])
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{
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ds[y * w + x].id = y * w + x;
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ds[y * w + x].x1 = ds[y * w + x].x2 = x;
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ds[y * w + x].y1 = ds[y * w + x].y2 = y;
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const int c = y * w + x; // current
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if (ds[c].use)
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continue;
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if (y > 0 && this->diffMap[(y-1) * w + x])
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dsUnion(ds, (y-1) * w + x, y * w + x);
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const int l = c - 1; // left
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const int r = c + 1; // right
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const int u = c - w; // up
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const int d = c + w; // down
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if (x > 0 && this->diffMap[y * w + x - 1])
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dsUnion(ds, y * w + x, y * w + x - 1);
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if ((x < w - 1 && y < h - 1 && ds[r].use && ds[d].use) ||
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(x > 0 && y < h - 1 && ds[l].use && ds[d].use) ||
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(x < w - 1 && y > 0 && ds[r].use && ds[u].use) ||
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(x > 0 && y > 0 && ds[l].use && ds[u].use) ||
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(x > 0 && y > 0 &&
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x < w - 1 && y < h - 1 && ds[l].use && ds[u].use &&
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ds[r].use && ds[d].use)
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)
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{
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ds[c].use = true;
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resolve = true;
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}
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}
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}
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while(resolve);
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for (unsigned int y = 0; y < h; ++y)
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for (unsigned int x = 0; x < w; ++x)
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{
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const int c = y * w + x; // current
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const int l = c - 1; // left
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const int u = c - w; // up
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if (ds[c].use)
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{
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ds[c].id = c;
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ds[c].row = false;
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ds[c].x1 = ds[c].x2 = x;
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ds[c].y1 = ds[c].y2 = y;
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if (y > 0 && ds[u].use)
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{
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bool ok = true;
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if (x > 0 && ds[l].id != ds[u].id)
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{
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// no need to use dsFind as the search order ensures that the id has
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// been fully resolved of the block above
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for(unsigned int j = ds[ds[u].id].x1; j <= ds[ds[u].id].x2; ++j)
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if (!ds[y * w + j].use)
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{
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ok = false;
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break;
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}
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}
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if (ok)
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{
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dsUnion(ds, u, c);
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ds[c].row = true;
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continue;
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}
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}
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if (x > 0 && ds[l].use && (ds[l].id == l || !ds[l].row))
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dsUnion(ds, l, c);
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}
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}
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int rectId = 0;
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for (unsigned int y = 0; y < h; ++y)
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for (unsigned int x = 0; x < w; ++x)
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if (this->diffMap[y * w + x] && ds[y * w + x].id == y * w + x)
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{
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const int c = y * w + x;
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if (ds[c].use && ds[c].id == c)
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{
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if (rectId >= KVMFR_MAX_DAMAGE_RECTS)
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{
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@ -416,10 +484,10 @@ static void updateDamageRects(CaptureFrame * frame)
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goto done;
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}
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int x1 = ds[y * w + x].x1 << this->diffShift;
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int y1 = ds[y * w + x].y1 << this->diffShift;
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int x2 = min((ds[y * w + x].x2 + 1) << this->diffShift, this->width);
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int y2 = min((ds[y * w + x].y2 + 1) << this->diffShift, this->height);
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int x1 = ds[c].x1 << this->diffShift;
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int y1 = ds[c].y1 << this->diffShift;
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int x2 = min((ds[c].x2 + 1) << this->diffShift, this->width);
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int y2 = min((ds[c].y2 + 1) << this->diffShift, this->height);
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frame->damageRects[rectId++] = (FrameDamageRect) {
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.x = x1,
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.y = y1,
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@ -427,8 +495,7 @@ static void updateDamageRects(CaptureFrame * frame)
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.height = y2 - y1,
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};
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}
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rectId = rectsRejectContained(frame->damageRects, rectId);
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}
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done:
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frame->damageRectsCount = rectId;
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