some more NRRectL goodies for canvas optimizations

(bzr r1804)

3 files changed, 63 insertions, 0 deletions

diff --git a/src/libnr/nr-macros.h b/src/libnr/nr-macros.h
index 616504c6f..0ccad30c4 100644
--- a/src/libnr/nr-macros.h
+++ b/src/libnr/nr-macros.h
@@ -60,6 +60,7 @@
 #define NR_RECT_DFLS_TEST_INTERSECT(a,b) (((a)->x0 < (b)->x1) && ((a)->x1 > (b)->x0) && ((a)->y0 < (b)->y1) && ((a)->y1 > (b)->y0))
 #define NR_RECT_DF_POINT_DF_TEST_INSIDE(r,p) (((p)->x >= (r)->x0) && ((p)->x < (r)->x1) && ((p)->y >= (r)->y0) && ((p)->y < (r)->y1))
 #define NR_RECT_LS_POINT_LS_TEST_INSIDE(r,p) (((p)->x >= (r)->x0) && ((p)->x < (r)->x1) && ((p)->y >= (r)->y0) && ((p)->y < (r)->y1))
+#define NR_RECT_LS_TEST_INSIDE(r,x,y) ((x >= (r)->x0) && (x < (r)->x1) && (y >= (r)->y0) && (y < (r)->y1))
 
 #define NR_MATRIX_D_TO_DOUBLE(m) ((m)->c)
 #define NR_MATRIX_D_FROM_DOUBLE(d) ((NRMatrix *) &(d)[0])
diff --git a/src/libnr/nr-rect.cpp b/src/libnr/nr-rect.cpp
index 6d881e7b0..460816021 100644
--- a/src/libnr/nr-rect.cpp
+++ b/src/libnr/nr-rect.cpp
@@ -45,6 +45,60 @@ nr_rect_d_intersect (NRRect *d, const NRRect *r0, const NRRect *r1)
 	return d;
 }
 
+// returns minimal rect which covers all of r0 not covered by r1
+NRRectL *
+nr_rect_l_subtract(NRRectL *d, NRRectL const *r0, NRRectL const *r1)
+{
+    bool inside1 = nr_rect_l_test_inside(r1, r0->x0, r0->y0);
+    bool inside2 = nr_rect_l_test_inside(r1, r0->x1, r0->y0);
+    bool inside3 = nr_rect_l_test_inside(r1, r0->x1, r0->y1);
+    bool inside4 = nr_rect_l_test_inside(r1, r0->x0, r0->y1);
+
+    if (inside1 && inside2 && inside3) {
+        nr_rect_l_set_empty (d);
+
+    } else if (inside1 && inside2) {
+        d->x0 = r0->x0;
+        d->y0 = r1->y1;
+
+        d->x1 = r0->x1;
+        d->y1 = r0->y1;
+    } else if (inside2 && inside3) {
+        d->x0 = r0->x0;
+        d->y0 = r0->y0;
+
+        d->x1 = r1->x0;
+        d->y1 = r0->y1;
+    } else if (inside3 && inside4) {
+        d->x0 = r0->x0;
+        d->y0 = r0->y0;
+
+        d->x1 = r0->x1;
+        d->y1 = r1->y0;
+    } else if (inside4 && inside1) {
+        d->x0 = r1->x1;
+        d->y0 = r0->y0;
+
+        d->x1 = r0->x1;
+        d->y1 = r0->y1;
+    } else {
+        d->x0 = r0->x0;
+        d->y0 = r0->y0;
+
+        d->x1 = r0->x1;
+        d->y1 = r0->y1;
+    }
+    return d;
+}
+
+NR::ICoord nr_rect_l_area(NRRectL *r)
+{
+  if (!r || NR_RECT_DFLS_TEST_EMPTY (r)) {
+      return 0;
+  }
+  return ((r->x1 - r->x0) * (r->y1 - r->y0));
+}
+
 NRRect *
 nr_rect_d_union (NRRect *d, const NRRect *r0, const NRRect *r1)
 {
diff --git a/src/libnr/nr-rect.h b/src/libnr/nr-rect.h
index ab78c1651..e0b3f30ae 100644
--- a/src/libnr/nr-rect.h
+++ b/src/libnr/nr-rect.h
@@ -55,6 +55,14 @@ inline bool empty(NRRect const &r)
          !((r0) && (r1) && !NR_RECT_DFLS_TEST_INTERSECT(r0, r1)))
 
 #define nr_rect_d_point_d_test_inside(r,p) ((p) && (!(r) || (!NR_RECT_DF_TEST_EMPTY(r) && NR_RECT_DF_POINT_DF_TEST_INSIDE(r,p))))
+#define nr_rect_l_point_l_test_inside(r,p) ((p) && (!(r) || (!NR_RECT_DFLS_TEST_EMPTY(r) && NR_RECT_LS_POINT_LS_TEST_INSIDE(r,p))))
+#define nr_rect_l_test_inside(r,x,y) ((!(r) || (!NR_RECT_DFLS_TEST_EMPTY(r) && NR_RECT_LS_TEST_INSIDE(r,x,y))))
+
+// returns minimal rect which covers all of r0 not covered by r1
+NRRectL *nr_rect_l_subtract(NRRectL *d, NRRectL const *r0, NRRectL const *r1);
+
+// returns the area of r
+NR::ICoord nr_rect_l_area(NRRectL *r);
 
 /* NULL values are OK for r0 and r1, but not for d */
 NRRect *nr_rect_d_intersect(NRRect *d, NRRect const *r0, NRRect const *r1);