Sketch splitting SkPicture into an interface and SkBigPicture.

src/core/SkMiniRecorder.h

+/*
+ * 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 SkMiniRecorder_DEFINED
+#define SkMiniRecorder_DEFINED
+
+#include "SkScalar.h"
+#include "SkTypes.h"
+class SkCanvas;
+class SkPaint;
+class SkPath;
+class SkPicture;
+class SkTextBlob;
+struct SkRect;
+
+// Records small pictures, but only a limited subset of the canvas API, and may fail.
+class SkMiniRecorder : SkNoncopyable {
+public:
+    SkMiniRecorder();
+    ~SkMiniRecorder();
+
+    // Try to record an op.  Returns false on failure.
+    bool drawRect(const SkRect&, const SkPaint&);
+    bool drawPath(const SkPath&, const SkPaint&);
+    bool drawTextBlob(const SkTextBlob*, SkScalar x, SkScalar y, const SkPaint&);
+
+    // Detach anything we've recorded as a picture, resetting this SkMiniRecorder.
+    SkPicture* detachAsPicture(const SkRect& cull);
+
+    // Equivalent to
+    //   SkAutoTUnref<SkPicture> p(this->detachAsPicture());
+    //   p->playback(canvas);
+    // but may be more efficient.
+    void flushToCanvas(SkCanvas*);

[reed1, 2015/05/04 13:26:34]

detachToCanvas?
detachAndPlayback?
detachAndDraw?

[mtklein, 2015/05/04 15:52:45]

Removed the whole method for now, given that it's called once and not really
specialized to be efficient yet.

+
+private:
+    enum class State { kEmpty, kDrawRect, kDrawPath, kDrawTextBlob };
+
+    State fState;
+    char  fBuffer[1024];  // TODO: size/align this carefully

[reed1, 2015/05/04 13:26:34]

do we already have an Aligned buffer helper template?

[mtklein, 2015/05/04 15:52:45]

Yep, done.

+};
+
+#endif//SkMiniRecorder_DEFINED