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[common] rects: add rectsMergeOverlapping helper function
This is based on the client's util_mergeOverlappingRects.
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@ -46,4 +46,6 @@ void rectsFramebufferToBuffer(FrameDamageRect * rects, int count,
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uint8_t * dst, int dstStride, int height,
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const FrameBuffer * frame, int srcStride);
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int rectsMergeOverlapping(FrameDamageRect * rects, int count);
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#endif
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@ -22,6 +22,9 @@
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#include <stdlib.h>
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#define min(a,b) ({ __typeof__ (a) _a = (a); __typeof__ (b) _b = (b); _a < _b ? _a : _b; })
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#define max(a,b) ({ __typeof__ (a) _a = (a); __typeof__ (b) _b = (b); _a > _b ? _a : _b; })
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struct Corner
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{
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int x;
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@ -197,3 +200,45 @@ void rectsFramebufferToBuffer(FrameDamageRect * rects, int count,
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rectsBufferCopy(rects, count, dst, dstStride, height,
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framebuffer_get_buffer(frame), srcStride, &data, fbRowStart, NULL);
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}
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static bool rectIntersects(const FrameDamageRect * r1, const FrameDamageRect * r2)
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{
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return r1->x < r2->x + r2->width &&
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r1->x + r1->width > r2->x &&
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r1->y < r2->y + r2->height &&
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r2->y + r1->height > r2->y;
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}
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int rectsMergeOverlapping(FrameDamageRect * rects, int count)
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{
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bool removed[count];
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bool changed;
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memset(removed, 0, sizeof(removed));
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do
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{
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changed = false;
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for (int i = 0; i < count; ++i)
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if (!removed[i])
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for (int j = i + 1; j < count; ++j)
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if (!removed[j] && rectIntersects(rects + i, rects + j))
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{
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uint32_t x2 = max(rects[i].x + rects[i].width, rects[j].x + rects[j].width);
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uint32_t y2 = max(rects[i].y + rects[i].height, rects[j].y + rects[j].height);
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rects[i].x = min(rects[i].x, rects[j].x);
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rects[i].y = min(rects[i].y, rects[j].y);
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rects[i].width = x2 - rects[i].x;
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rects[i].height = y2 - rects[i].y;
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removed[j] = true;
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changed = true;
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}
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}
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while (changed);
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int o = 0;
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for (int i = 0; i < count; ++i)
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if (!removed[i])
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rects[o++] = rects[i];
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return o;
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}
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