add endRecordingAsDrawable experiment

src/core/SkPictureRecorder.cpp

Index: src/core/SkPictureRecorder.cpp
diff --git a/src/core/SkPictureRecorder.cpp b/src/core/SkPictureRecorder.cpp
index 3262938ed1b62817fda591dfe360ee89269e7ea6..6d61ab3e07d01f5ce5614822cd7c494695daf1db 100644
--- a/src/core/SkPictureRecorder.cpp
+++ b/src/core/SkPictureRecorder.cpp
@@ -5,6 +5,7 @@
  * found in the LICENSE file.
  */
 
+#include "SkCanvasDrawable.h"
 #include "SkData.h"
 #include "SkLayerInfo.h"
 #include "SkPictureRecorder.h"
@@ -39,6 +40,7 @@ SkCanvas* SkPictureRecorder::getRecordingCanvas() {
 }
 
 SkPicture* SkPictureRecorder::endRecording() {
+#if 0
     // TODO: delay as much of this work until just before first playback?
     SkRecordOptimize(fRecord);
 
@@ -71,6 +73,10 @@ SkPicture* SkPictureRecorder::endRecording() {
     }
 
     return pict;
+#else
+    SkAutoTUnref<SkCanvasDrawable> drawable(this->EXPERIMENTAL_endRecordingAsDrawable());
+    return drawable->newPictureSnapshot();
+#endif
 }
 
 void SkPictureRecorder::partialReplay(SkCanvas* canvas) const {
@@ -81,3 +87,80 @@ void SkPictureRecorder::partialReplay(SkCanvas* canvas) const {
     int drawableCount = 0;
     SkRecordDraw(*fRecord, canvas, NULL, drawableCount, NULL/*bbh*/, NULL/*callback*/);
 }
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+class SkRecordedDrawable : public SkCanvasDrawable {
+    SkAutoTUnref<SkRecord>              fRecord;
+    SkAutoTUnref<SkBBoxHierarchy>       fBBH;
+    SkAutoTDelete<SkCanvasDrawableList> fDrawableList;
+    const SkRect                        fBounds;
+    const bool                          fDoSaveLayerInfo;
+
+public:
+    SkRecordedDrawable(SkRecord* record, SkBBoxHierarchy* bbh, SkCanvasDrawableList* drawableList,
+                       const SkRect& bounds, bool doSaveLayerInfo)
+        : fRecord(SkRef(record))
+        , fBBH(SkSafeRef(bbh))
+        , fDrawableList(drawableList)   // we take ownership
+        , fBounds(bounds)
+        , fDoSaveLayerInfo(doSaveLayerInfo)
+    {}
+
+protected:
+    SkRect onGetBounds() SK_OVERRIDE {
+        return fBounds;
+    }
+
+    void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+        SkPicture const* const* drawablePicts = NULL;
+        int drawableCount = 0;
+
+        // TODO: find a way to pass in the array of Drawables instead of forcing a snap...
+        //
+        // Perhaps SkRecordDraw could take two versions, or two different array args (but 1 count)?
+        //
+        SkAutoTDelete<SkPicture::SnapshotArray> pictList;
+        if (fDrawableList) {
+            pictList.reset(fDrawableList->newDrawableSnapshot());
+            drawablePicts = pictList->begin();
+            drawableCount = pictList->count();
+        }
+
+        SkRecordDraw(*fRecord, canvas, drawablePicts, drawableCount, fBBH, NULL/*callback*/);
+    }
+
+    SkPicture* onNewPictureSnapshot() SK_OVERRIDE {
+        SkAutoTUnref<SkLayerInfo> saveLayerData;
+
+        if (fBBH && fDoSaveLayerInfo) {
+            SkPicture::AccelData::Key key = SkLayerInfo::ComputeKey();
+
+            saveLayerData.reset(SkNEW_ARGS(SkLayerInfo, (key)));
+        }
+
+        SkPicture::SnapshotArray* pictList = NULL;
+        if (fDrawableList) {
+            pictList = fDrawableList->newDrawableSnapshot();
+        }
+        SkPicture* pict = SkNEW_ARGS(SkPicture, (fBounds, fRecord, pictList, fBBH));
+
+        if (saveLayerData) {
+            pict->EXPERIMENTAL_addAccelData(saveLayerData);
+        }
+        return pict;
+    }
+};
+
+SkCanvasDrawable* SkPictureRecorder::EXPERIMENTAL_endRecordingAsDrawable() {
+    // TODO: delay as much of this work until just before first playback?
+    SkRecordOptimize(fRecord);
+
+    if (fBBH.get()) {
+        SkRecordFillBounds(fCullRect, *fRecord, fBBH.get());
+    }
+
+    return SkNEW_ARGS(SkRecordedDrawable, (fRecord, fBBH, fRecorder->detachDrawableList(),
+                                           fCullRect,
+                                           SkToBool(fFlags & kComputeSaveLayerInfo_RecordFlag)));
+}