Add base types for path ops

src/pathops/SkPathOpsRect.cpp

Index: src/pathops/SkPathOpsRect.cpp
===================================================================
--- src/pathops/SkPathOpsRect.cpp	(revision 0)
+++ src/pathops/SkPathOpsRect.cpp	(revision 0)
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "SkPathOpsCubic.h"
+#include "SkPathOpsLine.h"
+#include "SkPathOpsQuad.h"
+#include "SkPathOpsRect.h"
+
+void SkDRect::setBounds(const SkDLine& line) {
+    set(line[0]);
+    add(line[1]);
+}
+
+void SkDRect::setBounds(const SkDQuad& quad) {
+    set(quad[0]);
+    add(quad[2]);
+    double tValues[2];
+    int roots = 0;
+    if (!between(quad[0].fX, quad[1].fX, quad[2].fX)) {
+        roots = SkDQuad::FindExtrema(quad[0].fX, quad[1].fX, quad[2].fX, tValues);
+    }
+    if (!between(quad[0].fY, quad[1].fY, quad[2].fY)) {
+        roots += SkDQuad::FindExtrema(quad[0].fY, quad[1].fY, quad[2].fY, &tValues[roots]);
+    }
+    for (int x = 0; x < roots; ++x) {
+        add(quad.xyAtT(tValues[x]));
+    }
+}
+
+void SkDRect::setRawBounds(const SkDQuad& quad) {
+    set(quad[0]);
+    for (int x = 1; x < 3; ++x) {
+        add(quad[x]);
+    }
+}
+
+static bool is_bounded_by_end_points(double a, double b, double c, double d) {
+    return between(a, b, d) && between(a, c, d);
+}
+
+void SkDRect::setBounds(const SkDCubic& c) {
+    set(c[0]);
+    add(c[3]);
+    double tValues[4];
+    int roots = 0;
+    if (!is_bounded_by_end_points(c[0].fX, c[1].fX, c[2].fX, c[3].fX)) {
+        roots = SkDCubic::FindExtrema(c[0].fX, c[1].fX, c[2].fX, c[3].fX, tValues);
+    }
+    if (!is_bounded_by_end_points(c[0].fY, c[1].fY, c[2].fY, c[3].fY)) {
+        roots += SkDCubic::FindExtrema(c[0].fY, c[1].fY, c[2].fY, c[3].fY, &tValues[roots]);
+    }
+    for (int x = 0; x < roots; ++x) {
+        add(c.xyAtT(tValues[x]));
+    }
+}
+
+void SkDRect::setRawBounds(const SkDCubic& cubic) {
+    set(cubic[0]);
+    for (int x = 1; x < 4; ++x) {
+        add(cubic[x]);
+    }
+}