Implement SkPicture::bytesUsed() for SkRecord backend

tests/PictureTest.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBBoxHierarchy.h"
 #include "SkBlurImageFilter.h"
 #include "SkCanvas.h"
@@ skipping 1680 matching lines @@
     SkCanvas* canvas = recorder.beginRecording(1, 1);
     canvas->drawARGB(255, 255, 255, 255);
     SkAutoTUnref<SkPicture> hasData(recorder.endRecording());
     // picture should have a non-zero id after recording
     REPORTER_ASSERT(reporter, hasData->uniqueID() != SK_InvalidGenID);
 
     // both pictures should have different ids
     REPORTER_ASSERT(reporter, hasData->uniqueID() != empty->uniqueID());
 }
 
+static void test_bytes_used(skiatest::Reporter* reporter) {
+    SkPictureRecorder recorder;
+
+    recorder.beginRecording(0, 0);
+    SkAutoTUnref<SkPicture> empty(recorder.endRecording());
+
+    // A SkPicture also has SkRecord and possibly SkBBHierarchy as members.
+    REPORTER_ASSERT(reporter, SkPictureUtils::approximateBytesUsed(empty.get()) >=
+                              sizeof(SkPicture));
+}
+
 DEF_TEST(Picture, reporter) {
 #ifdef SK_DEBUG
     test_deleting_empty_picture();
     test_serializing_empty_picture();
 #else
     test_bad_bitmap();
 #endif
     test_unbalanced_save_restores(reporter);
     test_peephole();
 #if SK_SUPPORT_GPU
     test_gpu_veto(reporter, false);
     test_gpu_veto(reporter, true);
 #endif
     test_has_text(reporter, false);
     test_has_text(reporter, true);
     test_analysis(reporter, false);
     test_analysis(reporter, true);
     test_gatherpixelrefs(reporter);
     test_gatherpixelrefsandrects(reporter);
     test_bitmap_with_encoded_data(reporter);
     test_draw_empty(reporter);
     test_clip_bound_opt(reporter);
     test_clip_expansion(reporter);
     test_hierarchical(reporter);
     test_gen_id(reporter);
+    test_bytes_used(reporter);
 }
 
 #if SK_SUPPORT_GPU
 DEF_GPUTEST(GPUPicture, reporter, factory) {
     test_gpu_picture_optimization(reporter, factory);
 }
 #endif
 
 static void draw_bitmaps(const SkBitmap bitmap, SkCanvas* canvas) {
     const SkPaint paint;
@@ skipping 86 matching lines @@
         this->searchCalls++;
     }
 
     // All other methods unimplemented.
     virtual void insert(void* data, const SkIRect& bounds, bool defer) {}
     virtual void flushDeferredInserts() {}
     virtual void clear() {}
     virtual int getCount() const { return 0; }
     virtual int getDepth() const { return 0; }
     virtual void rewindInserts() {}
+    virtual size_t bytesUsed() const { return 0; }
 };
 
 class SpoonFedBBHFactory : public SkBBHFactory {
 public:
     explicit SpoonFedBBHFactory(SkBBoxHierarchy* bbh) : fBBH(bbh) {}
     virtual SkBBoxHierarchy* operator()(int width, int height) const {
         return SkRef(fBBH);
     }
 private:
     SkBBoxHierarchy* fBBH;
 };
 
 // When the canvas clip covers the full picture, we don't need to call the BBH.
 DEF_TEST(Picture_SkipBBH, r) {
     CountingBBH bbh;
     SpoonFedBBHFactory factory(&bbh);
 
     SkPictureRecorder recorder;
     recorder.beginRecording(320, 240, &factory);
     SkAutoTUnref<const SkPicture> picture(recorder.endRecording());
 
     SkCanvas big(640, 480), small(300, 200);
 
     picture->draw(&big);
     REPORTER_ASSERT(r, bbh.searchCalls == 0);
 
     picture->draw(&small);
     REPORTER_ASSERT(r, bbh.searchCalls == 1);
 }