Sketch splitting SkPicture into an interface and SkBigPicture.

Adds small pictures for drawRect(), drawTextBlob(), and drawPath().
These cover about 89% of draw calls from Blink SKPs,
and about 25% of draw calls from our GMs.

SkPicture handles:
  - serialization and deserialization
  - unique IDs

Everything else is left to the subclasses:
  - playback(), cullRect()
  - hasBitmap(), hasText(), suitableForGPU(), etc.
  - LayerInfo / AccelData if applicable.

The time to record a 1-op picture improves a good chunk
(2 mallocs to 1), and the time to record a 0-op picture
greatly improves (2 mallocs to none):

    picture_overhead_draw:   450ns -> 350ns
    picture_overhead_nodraw: 300ns -> 90ns

BUG=skia:

Review URL: https://codereview.chromium.org/1112523006

1 files changed, 31 insertions, 24 deletions

diff --git a/src/core/SkPictureRecorder.cpp b/src/core/SkPictureRecorder.cpp
index 282e2c22dd..c110e0a2db 100644
--- a/src/core/SkPictureRecorder.cpp
+++ b/src/core/SkPictureRecorder.cpp
@@ -5,6 +5,7 @@
  * found in the LICENSE file.
  */
 
+#include "SkBigPicture.h"
 #include "SkData.h"
 #include "SkDrawable.h"
 #include "SkLayerInfo.h"
@@ -18,7 +19,7 @@
 
 SkPictureRecorder::SkPictureRecorder() {
     fActivelyRecording = false;
-    fRecorder.reset(SkNEW_ARGS(SkRecorder, (nullptr, SkRect::MakeWH(0,0))));
+    fRecorder.reset(SkNEW_ARGS(SkRecorder, (nullptr, SkRect::MakeWH(0,0), &fMiniRecorder)));
 }
 
 SkPictureRecorder::~SkPictureRecorder() {}
@@ -34,8 +35,10 @@ SkCanvas* SkPictureRecorder::beginRecording(const SkRect& cullRect,
         SkASSERT(fBBH.get());
     }
 
-    fRecord.reset(SkNEW(SkRecord));
-    fRecorder->reset(fRecord.get(), cullRect);
+    if (!fRecord) {
+        fRecord.reset(SkNEW(SkRecord));
+    }
+    fRecorder->reset(fRecord.get(), cullRect, &fMiniRecorder);
     fActivelyRecording = true;
     return this->getRecordingCanvas();
 }
@@ -47,19 +50,23 @@ SkCanvas* SkPictureRecorder::getRecordingCanvas() {
 SkPicture* SkPictureRecorder::endRecordingAsPicture() {
     fActivelyRecording = false;
     fRecorder->restoreToCount(1);  // If we were missing any restores, add them now.
+
+    if (fRecord->count() == 0) {
+        return fMiniRecorder.detachAsPicture(fCullRect);
+    }
+
     // TODO: delay as much of this work until just before first playback?
     SkRecordOptimize(fRecord);
 
     SkAutoTUnref<SkLayerInfo> saveLayerData;
 
     if (fBBH && (fFlags & kComputeSaveLayerInfo_RecordFlag)) {
-        SkPicture::AccelData::Key key = SkLayerInfo::ComputeKey();
-
-        saveLayerData.reset(SkNEW_ARGS(SkLayerInfo, (key)));
+        saveLayerData.reset(SkNEW(SkLayerInfo));
     }
 
     SkDrawableList* drawableList = fRecorder->getDrawableList();
-    SkPicture::SnapshotArray* pictList = drawableList ? drawableList->newDrawableSnapshot() : NULL;
+    SkBigPicture::SnapshotArray* pictList =
+        drawableList ? drawableList->newDrawableSnapshot() : NULL;
 
     if (fBBH.get()) {
         if (saveLayerData) {
@@ -77,12 +84,12 @@ SkPicture* SkPictureRecorder::endRecordingAsPicture() {
     for (int i = 0; pictList && i < pictList->count(); i++) {
         subPictureBytes += SkPictureUtils::ApproximateBytesUsed(pictList->begin()[i]);
     }
-    return SkNEW_ARGS(SkPicture, (fCullRect,
-                                  fRecord.detach(),
-                                  pictList,
-                                  fBBH.detach(),
-                                  saveLayerData.detach(),
-                                  subPictureBytes));
+    return SkNEW_ARGS(SkBigPicture, (fCullRect,
+                                     fRecord.detach(),
+                                     pictList,
+                                     fBBH.detach(),
+                                     saveLayerData.detach(),
+                                     subPictureBytes));
 }
 
 void SkPictureRecorder::partialReplay(SkCanvas* canvas) const {
@@ -133,7 +140,7 @@ protected:
     }
 
     SkPicture* onNewPictureSnapshot() override {
-        SkPicture::SnapshotArray* pictList = NULL;
+        SkBigPicture::SnapshotArray* pictList = NULL;
         if (fDrawableList) {
             // TODO: should we plumb-down the BBHFactory and recordFlags from our host
             //       PictureRecorder?
@@ -143,9 +150,7 @@ protected:
         SkAutoTUnref<SkLayerInfo> saveLayerData;
 
         if (fBBH && fDoSaveLayerInfo) {
-            SkPicture::AccelData::Key key = SkLayerInfo::ComputeKey();
-
-            saveLayerData.reset(SkNEW_ARGS(SkLayerInfo, (key)));
+            saveLayerData.reset(SkNEW(SkLayerInfo));
 
             SkBBoxHierarchy* bbh = NULL;    // we've already computed fBBH (received in constructor)
             // TODO: update saveLayer info computation to reuse the already computed
@@ -157,20 +162,22 @@ protected:
         for (int i = 0; pictList && i < pictList->count(); i++) {
             subPictureBytes += SkPictureUtils::ApproximateBytesUsed(pictList->begin()[i]);
         }
-        // SkPicture will take ownership of a ref on both fRecord and fBBH.
+        // SkBigPicture will take ownership of a ref on both fRecord and fBBH.
         // We're not willing to give up our ownership, so we must ref them for SkPicture.
-        return SkNEW_ARGS(SkPicture, (fBounds,
-                                      SkRef(fRecord.get()),
-                                      pictList,
-                                      SkSafeRef(fBBH.get()),
-                                      saveLayerData.detach(),
-                                      subPictureBytes));
+        return SkNEW_ARGS(SkBigPicture, (fBounds,
+                                         SkRef(fRecord.get()),
+                                         pictList,
+                                         SkSafeRef(fBBH.get()),
+                                         saveLayerData.detach(),
+                                         subPictureBytes));
     }
 };
 
 SkDrawable* SkPictureRecorder::endRecordingAsDrawable() {
     fActivelyRecording = false;
+    fRecorder->flushMiniRecorder();
     fRecorder->restoreToCount(1);  // If we were missing any restores, add them now.
+
     // TODO: delay as much of this work until just before first playback?
     SkRecordOptimize(fRecord);