Mesa (master): gallium/util: Add new u_box helpers

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Module: Mesa
Branch: master
Commit: 26a9e2bb15aaac0957a0be493d9634c82a1fa6c5
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=26a9e2bb15aaac0957a0be493d9634c82a1fa6c5

Author: Axel Davy <davyaxel0 at gmail.com>
Date:   Sat Mar  6 17:34:22 2021 +0100

gallium/util: Add new u_box helpers

Signed-off-by: Axel Davy <davyaxel0 at gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9451>

---

 src/gallium/auxiliary/util/u_box.h | 39 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/src/gallium/auxiliary/util/u_box.h b/src/gallium/auxiliary/util/u_box.h
index b3f478e7bfc..764bf5037a5 100644
--- a/src/gallium/auxiliary/util/u_box.h
+++ b/src/gallium/auxiliary/util/u_box.h
@@ -119,6 +119,45 @@ u_box_volume_3d(const struct pipe_box *box)
    return (int64_t)box->width * box->height * box->depth;
 }
 
+/* Aliasing of @dst permitted. Supports empty width */
+static inline void
+u_box_union_1d(struct pipe_box *dst,
+               const struct pipe_box *a, const struct pipe_box *b)
+{
+   int x, width;
+
+   if (a->width == 0) {
+       x = b->x;
+       width = b->width;
+   } else if (b->width == 0) {
+       x = a->x;
+       width = a->width;
+   } else {
+       x = MIN2(a->x, b->x);
+       width = MAX2(a->x + a->width, b->x + b->width) - x;
+   }
+
+   dst->x = x;
+   dst->width = width;
+}
+
+/* Aliasing of @dst permitted. */
+static inline void
+u_box_intersect_1d(struct pipe_box *dst,
+               const struct pipe_box *a, const struct pipe_box *b)
+{
+   int x;
+
+   x = MAX2(a->x, b->x);
+
+   dst->width = MIN2(a->x + a->width, b->x + b->width) - x;
+   dst->x = x;
+   if (dst->width <= 0) {
+      dst->x = 0;
+      dst->width = 0;
+   }
+}
+
 /* Aliasing of @dst permitted. */
 static inline void
 u_box_union_2d(struct pipe_box *dst,