1 files changed, 99 insertions, 0 deletions
diff --git a/src/core/SkAAClip.h b/src/core/SkAAClip.h
new file mode 100644
index 0000000000..c62292f79e
--- /dev/null
+++ b/src/core/SkAAClip.h
@@ -0,0 +1,99 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkAAClip_DEFINED
+#define SkAAClip_DEFINED
+
+#include "SkBlitter.h"
+#include "SkRegion.h"
+
+#define SkAAClip_gEmptyPtr   ((SkAAClip::RunHead*)-1)
+#define SkAAClip_gRectPtr    NULL
+
+class SkAAClip {
+public:
+    SkAAClip();
+    SkAAClip(const SkAAClip&);
+    ~SkAAClip();
+
+    SkAAClip& operator=(const SkAAClip&);
+    friend bool operator==(const SkAAClip&, const SkAAClip&);
+    friend bool operator!=(const SkAAClip& a, const SkAAClip& b) {
+        return !(a == b);
+    }
+
+    void swap(SkAAClip&);
+
+    bool isEmpty() const { return SkAAClip_gEmptyPtr == fRunHead; }
+    bool isRect() const { return SkAAClip_gRectPtr == fRunHead; }
+    bool isComplex() const { return !this->isEmpty() && !this->isRect(); }
+    const SkIRect& getBounds() const { return fBounds; }
+
+    bool setEmpty();
+    bool setRect(const SkIRect&);
+    bool setRect(const SkRect&);
+    bool setPath(const SkPath&, const SkRegion& clip);
+
+    bool op(const SkAAClip&, const SkAAClip&, SkRegion::Op);
+
+    // called internally
+    
+    bool quickContains(int left, int top, int right, int bottom) const;
+    const uint8_t* findRow(int y, int* lastYForRow) const;
+    const uint8_t* findX(const uint8_t data[], int x, int* initialCount) const;
+
+private:
+    struct RunHead;
+    struct YOffset;
+
+    SkIRect  fBounds;
+    RunHead* fRunHead;
+
+    void freeRuns();
+
+    class Builder;
+    friend class Builder;
+    class BuilderBlitter;
+    friend class BuilderBlitter;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+class SkAAClipBlitter : public SkBlitter {
+public:
+    SkAAClipBlitter() : fRuns(NULL) {}
+    virtual ~SkAAClipBlitter();
+
+    void init(SkBlitter* blitter, const SkAAClip* aaclip) {
+        SkASSERT(aaclip && !aaclip->isEmpty());
+        fBlitter = blitter;
+        fAAClip = aaclip;
+        fAAClipBounds = aaclip->getBounds();
+    }
+    
+    virtual void blitH(int x, int y, int width) SK_OVERRIDE;
+    virtual void blitAntiH(int x, int y, const SkAlpha[],
+                           const int16_t runs[]) SK_OVERRIDE;
+    virtual void blitV(int x, int y, int height, SkAlpha alpha) SK_OVERRIDE;
+    virtual void blitRect(int x, int y, int width, int height) SK_OVERRIDE;
+    virtual void blitMask(const SkMask&, const SkIRect& clip) SK_OVERRIDE;
+    virtual const SkBitmap* justAnOpaqueColor(uint32_t* value) SK_OVERRIDE;
+    
+private:
+    SkBlitter*      fBlitter;
+    const SkAAClip* fAAClip;
+    SkIRect         fAAClipBounds;
+
+    // lazily allocated
+    int16_t*        fRuns;
+    SkAlpha*        fAA;    // points into fRuns allocation
+
+    void ensureRunsAndAA();
+};
+
+#endif