Add base types for path ops

src/pathops/SkPathOpsRect.h

Index: src/pathops/SkPathOpsRect.h
===================================================================
--- src/pathops/SkPathOpsRect.h	(revision 0)
+++ src/pathops/SkPathOpsRect.h	(revision 0)
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#ifndef SkPathOpsRect_DEFINED
+#define SkPathOpsRect_DEFINED
+
+#include "SkPathOpsPoint.h"
+
+struct SkDRect {
+    double fLeft, fTop, fRight, fBottom;
+
+    void add(const SkDPoint& pt) {
+        if (fLeft > pt.fX) {
+            fLeft = pt.fX;
+        }
+        if (fTop > pt.fY) {
+            fTop = pt.fY;
+        }
+        if (fRight < pt.fX) {
+            fRight = pt.fX;
+        }
+        if (fBottom < pt.fY) {
+            fBottom = pt.fY;
+        }
+    }
+
+    // FIXME: used by debugging only ?
+    bool contains(const SkDPoint& pt) const {
+        return approximately_between(fLeft, pt.fX, fRight)
+                && approximately_between(fTop, pt.fY, fBottom);
+    }
+
+    bool intersects(SkDRect* r) const {
+        SkASSERT(fLeft <= fRight);
+        SkASSERT(fTop <= fBottom);
+        SkASSERT(r->fLeft <= r->fRight);
+        SkASSERT(r->fTop <= r->fBottom);
+        return r->fLeft <= fRight && fLeft <= r->fRight && r->fTop <= fBottom && fTop <= r->fBottom;
+    }
+
+    void set(const SkDPoint& pt) {
+        fLeft = fRight = pt.fX;
+        fTop = fBottom = pt.fY;
+    }
+
+    void setBounds(const SkDLine&);
+    void setBounds(const SkDCubic&);
+    void setBounds(const SkDQuad&);
+    void setRawBounds(const SkDCubic&);
+    void setRawBounds(const SkDQuad&);
+};
+
+#endif