diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/src/core/SkRasterClip.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/src/core/SkRasterClip.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,163 @@
+/*
+ * Copyright 2010 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkRasterClip_DEFINED
+#define SkRasterClip_DEFINED
+
+#include "SkRegion.h"
+#include "SkAAClip.h"
+
+class SkRasterClip {
+public:
+    SkRasterClip();
+    SkRasterClip(const SkIRect&);
+    SkRasterClip(const SkRasterClip&);
+    ~SkRasterClip();
+
+    bool isBW() const { return fIsBW; }
+    bool isAA() const { return !fIsBW; }
+    const SkRegion& bwRgn() const { SkASSERT(fIsBW); return fBW; }
+    const SkAAClip& aaRgn() const { SkASSERT(!fIsBW); return fAA; }
+
+    bool isEmpty() const {
+        SkASSERT(this->computeIsEmpty() == fIsEmpty);
+        return fIsEmpty;
+    }
+
+    bool isRect() const {
+        SkASSERT(this->computeIsRect() == fIsRect);
+        return fIsRect;
+    }
+
+    bool isComplex() const;
+    const SkIRect& getBounds() const;
+
+    bool setEmpty();
+    bool setRect(const SkIRect&);
+
+    bool setPath(const SkPath& path, const SkRegion& clip, bool doAA);
+    bool setPath(const SkPath& path, const SkIRect& clip, bool doAA);
+
+    bool op(const SkIRect&, SkRegion::Op);
+    bool op(const SkRegion&, SkRegion::Op);
+    bool op(const SkRasterClip&, SkRegion::Op);
+    bool op(const SkRect&, SkRegion::Op, bool doAA);
+
+    void translate(int dx, int dy, SkRasterClip* dst) const;
+    void translate(int dx, int dy) {
+        this->translate(dx, dy, this);
+    }
+
+    bool quickContains(const SkIRect& rect) const;
+    bool quickContains(int left, int top, int right, int bottom) const {
+        return quickContains(SkIRect::MakeLTRB(left, top, right, bottom));
+    }
+
+    /**
+     *  Return true if this region is empty, or if the specified rectangle does
+     *  not intersect the region. Returning false is not a guarantee that they
+     *  intersect, but returning true is a guarantee that they do not.
+     */
+    bool quickReject(const SkIRect& rect) const {
+        return this->isEmpty() || rect.isEmpty() ||
+               !SkIRect::Intersects(this->getBounds(), rect);
+    }
+
+    // hack for SkCanvas::getTotalClip
+    const SkRegion& forceGetBW();
+
+#ifdef SK_DEBUG
+    void validate() const;
+#else
+    void validate() const {}
+#endif
+
+private:
+    SkRegion    fBW;
+    SkAAClip    fAA;
+    bool        fIsBW;
+    // these 2 are caches based on querying the right obj based on fIsBW
+    bool        fIsEmpty;
+    bool        fIsRect;
+
+    bool computeIsEmpty() const {
+        return fIsBW ? fBW.isEmpty() : fAA.isEmpty();
+    }
+
+    bool computeIsRect() const {
+        return fIsBW ? fBW.isRect() : false;
+    }
+
+    bool updateCacheAndReturnNonEmpty() {
+        fIsEmpty = this->computeIsEmpty();
+        fIsRect = this->computeIsRect();
+        return !fIsEmpty;
+    }
+
+    void convertToAA();
+};
+
+class SkAutoRasterClipValidate : SkNoncopyable {
+public:
+    SkAutoRasterClipValidate(const SkRasterClip& rc) : fRC(rc) {
+        fRC.validate();
+    }
+    ~SkAutoRasterClipValidate() {
+        fRC.validate();
+    }
+private:
+    const SkRasterClip& fRC;
+};
+#define SkAutoRasterClipValidate(...) SK_REQUIRE_LOCAL_VAR(SkAutoRasterClipValidate)
+
+#ifdef SK_DEBUG
+    #define AUTO_RASTERCLIP_VALIDATE(rc)    SkAutoRasterClipValidate arcv(rc)
+#else
+    #define AUTO_RASTERCLIP_VALIDATE(rc)
+#endif
+
+///////////////////////////////////////////////////////////////////////////////
+
+/**
+ *  Encapsulates the logic of deciding if we need to change/wrap the blitter
+ *  for aaclipping. If so, getRgn and getBlitter return modified values. If
+ *  not, they return the raw blitter and (bw) clip region.
+ *
+ *  We need to keep the constructor/destructor cost as small as possible, so we
+ *  can freely put this guy on the stack, and not pay too much for the case when
+ *  we're really BW anyways.
+ */
+class SkAAClipBlitterWrapper {
+public:
+    SkAAClipBlitterWrapper();
+    SkAAClipBlitterWrapper(const SkRasterClip&, SkBlitter*);
+    SkAAClipBlitterWrapper(const SkAAClip*, SkBlitter*);
+
+    void init(const SkRasterClip&, SkBlitter*);
+
+    const SkIRect& getBounds() const {
+        SkASSERT(fClipRgn);
+        return fClipRgn->getBounds();
+    }
+    const SkRegion& getRgn() const {
+        SkASSERT(fClipRgn);
+        return *fClipRgn;
+    }
+    SkBlitter* getBlitter() {
+        SkASSERT(fBlitter);
+        return fBlitter;
+    }
+
+private:
+    SkRegion        fBWRgn;
+    SkAAClipBlitter fAABlitter;
+    // what we return
+    const SkRegion* fClipRgn;
+    SkBlitter* fBlitter;
+};
+
+#endif