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[common] rects: add rectsMergeOverlapping helper function

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This is based on the client's util_mergeOverlappingRects.
This commit is contained in:
Quantum 2021-08-11 02:36:16 -04:00 committed by Geoffrey McRae
parent 22bbc2457e
commit 604b44d6d8
2 changed files with 47 additions and 0 deletions
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2
common/include/common/rects.h
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@ -46,4 +46,6 @@ void rectsFramebufferToBuffer(FrameDamageRect * rects, int count,
uint8_t * dst, int dstStride, int height,
const FrameBuffer * frame, int srcStride);
int rectsMergeOverlapping(FrameDamageRect * rects, int count);
#endif

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