privatize SkEdgeClipper.h

git-svn-id: http://skia.googlecode.com/svn/trunk@5027 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 51 insertions, 0 deletions

diff --git a/src/core/SkEdgeClipper.h b/src/core/SkEdgeClipper.h
new file mode 100644
index 0000000000..a7eedd571e
--- /dev/null
+++ b/src/core/SkEdgeClipper.h
@@ -0,0 +1,51 @@
+
+/*
+ * Copyright 2009 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#ifndef SkEdgeClipper_DEFINED
+#define SkEdgeClipper_DEFINED
+
+#include "SkPath.h"
+
+/** This is basically an iterator. It is initialized with an edge and a clip,
+    and then next() is called until it returns kDone_Verb.
+ */
+class SkEdgeClipper {
+public:
+    bool clipQuad(const SkPoint pts[3], const SkRect& clip);
+    bool clipCubic(const SkPoint pts[4], const SkRect& clip);
+
+    SkPath::Verb next(SkPoint pts[]);
+    
+private:
+    SkPoint*        fCurrPoint;
+    SkPath::Verb*   fCurrVerb;
+    
+    enum {
+        kMaxVerbs = 13,
+        kMaxPoints = 32
+    };
+    SkPoint         fPoints[kMaxPoints];
+    SkPath::Verb    fVerbs[kMaxVerbs];
+
+    void clipMonoQuad(const SkPoint srcPts[3], const SkRect& clip);
+    void clipMonoCubic(const SkPoint srcPts[4], const SkRect& clip);
+    void appendVLine(SkScalar x, SkScalar y0, SkScalar y1, bool reverse);
+    void appendQuad(const SkPoint pts[3], bool reverse);
+    void appendCubic(const SkPoint pts[4], bool reverse);
+};
+
+#ifdef SK_DEBUG
+    void sk_assert_monotonic_x(const SkPoint pts[], int count);
+    void sk_assert_monotonic_y(const SkPoint pts[], int count);
+#else
+    #define sk_assert_monotonic_x(pts, count)
+    #define sk_assert_monotonic_y(pts, count)
+#endif
+
+#endif