Support transformation and comparison of bounding boxes.

2 files changed, 27 insertions, 0 deletions

diff --git a/fitz/base_geometry.c b/fitz/base_geometry.c
index e0466991..375de12d 100644
--- a/fitz/base_geometry.c
+++ b/fitz/base_geometry.c
@@ -202,3 +202,27 @@ fz_transformrect(fz_matrix m, fz_rect r)
 	r.y1 = MAX4(s.y, t.y, u.y, v.y);
 	return r;
 }
+
+fz_bbox
+fz_transformbbox(fz_matrix m, fz_bbox b)
+{
+	fz_point s, t, u, v;
+
+	if (fz_isinfinitebbox(b))
+		return b;
+
+	s.x = b.x0; s.y = b.y0;
+	t.x = b.x0; t.y = b.y1;
+	u.x = b.x1; u.y = b.y1;
+	v.x = b.x1; v.y = b.y0;
+	s = fz_transformpoint(m, s);
+	t = fz_transformpoint(m, t);
+	u = fz_transformpoint(m, u);
+	v = fz_transformpoint(m, v);
+	b.x0 = MIN4(s.x, t.x, u.x, v.x);
+	b.y0 = MIN4(s.y, t.y, u.y, v.y);
+	b.x1 = MAX4(s.x, t.x, u.x, v.x);
+	b.y1 = MAX4(s.y, t.y, u.y, v.y);
+	return b;
+
+}
diff --git a/fitz/fitz.h b/fitz/fitz.h
index 1cd4e3fa..f192daa4 100644
--- a/fitz/fitz.h
+++ b/fitz/fitz.h
@@ -218,6 +218,8 @@ extern const fz_bbox fz_infinitebbox;
 
 #define fz_isemptyrect(r) ((r).x0 == (r).x1)
 #define fz_isinfiniterect(r) ((r).x0 > (r).x1)
+#define fz_isemptybbox(b) ((b).x0 == (b).x1)
+#define fz_isinfinitebbox(b) ((b).x0 > (b).x1)
 
 struct fz_matrix_s
 {
@@ -258,6 +260,7 @@ fz_bbox fz_unionbbox(fz_bbox a, fz_bbox b);
 fz_point fz_transformpoint(fz_matrix m, fz_point p);
 fz_point fz_transformvector(fz_matrix m, fz_point p);
 fz_rect fz_transformrect(fz_matrix m, fz_rect r);
+fz_bbox fz_transformbbox(fz_matrix m, fz_bbox b);
 
 /*
  * Basic crypto functions.