Sketch splitting SkPicture into an interface and SkBigPicture.

src/core/SkBigPicture.h

Index: src/core/SkBigPicture.h
diff --git a/src/core/SkBigPicture.h b/src/core/SkBigPicture.h
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index 0000000000000000000000000000000000000000..14e413b55af59867590edc67c1c892ddac6e3de0
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+++ b/src/core/SkBigPicture.h
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+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkBigPicture_DEFINED
+#define SkBigPicture_DEFINED
+
+#include "SkPicture.h"
+#include "SkLazyPtr.h"
+
+class SkBBoxHierarchy;
+class SkRecord;
+
+// An implementation of SkPicture supporting an arbitrary number of drawing commands.
+class SkBigPicture final : public SkPicture {
+public:
+    // AccelData provides a base class for device-specific acceleration data.
+    class AccelData : public SkRefCnt { };
+
+    // An array of refcounted const SkPicture pointers.
+    class SnapshotArray : ::SkNoncopyable {
+    public:
+        SnapshotArray(const SkPicture* pics[], int count) : fPics(pics), fCount(count) {}
+        ~SnapshotArray() { for (int i = 0; i < fCount; i++) { fPics[i]->unref(); } }
+
+        const SkPicture* const* begin() const { return fPics; }
+        int count() const { return fCount; }
+    private:
+        SkAutoTMalloc<const SkPicture*> fPics;
+        int fCount;
+    };
+
+    SkBigPicture(const SkRect& cull,
+                 SkRecord*,            // We take ownership of the caller's ref.
+                 SnapshotArray*,       // We take exclusive ownership.
+                 SkBBoxHierarchy*,     // We take ownership of the caller's ref.
+                 AccelData*,           // We take ownership of the caller's ref.
+                 size_t approxBytesUsedBySubPictures);
+
+
+// SkPicture overrides
+    void playback(SkCanvas*, AbortCallback*) const override;
+    SkRect cullRect() const override;
+    bool hasText() const override;
+    bool willPlayBackBitmaps() const override;
+    int approximateOpCount() const override;
+    size_t approximateBytesUsed() const override;
+    const SkBigPicture* asSkBigPicture() const override { return this; }
+
+// Used by GrLayerHoister
+    void partialPlayback(SkCanvas*,
+                         unsigned start,
+                         unsigned stop,
+                         const SkMatrix& initialCTM) const;
+// Used by GrRecordReplaceDraw
+    const SkBBoxHierarchy* bbh() const { return fBBH; }
+    const SkRecord*     record() const { return fRecord; }
+    const AccelData* accelData() const { return fAccelData; }
+
+private:
+    struct Analysis {
+        explicit Analysis(const SkRecord&);
+
+        bool suitableForGpuRasterization(const char** reason) const;
+
+        uint8_t fNumSlowPathsAndDashEffects;
+        bool    fWillPlaybackBitmaps : 1;
+        bool    fHasText             : 1;
+    };
+
+    int numSlowPaths() const override;
+    const Analysis& analysis() const;
+    int drawableCount() const;
+    SkPicture const* const* drawablePicts() const;
+
+    const SkRect                          fCullRect;
+    const size_t                          fApproxBytesUsedBySubPictures;
+    SkLazyPtr<const Analysis>             fAnalysis;
+    SkAutoTUnref<const SkRecord>          fRecord;
+    SkAutoTDelete<const SnapshotArray>    fDrawablePicts;
+    SkAutoTUnref<const SkBBoxHierarchy>   fBBH;
+    SkAutoTUnref<const AccelData>         fAccelData;
+};
+
+#endif//SkBigPicture_DEFINED