Add generation ID to SkPicture

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 "SkBitmapDevice.h"
 #include "SkCanvas.h"
 #include "SkColorPriv.h"
@@ skipping 1124 matching lines @@
     REPORTER_ASSERT(reporter, parentWBP.willPlayBackBitmaps()); // 1
 
     SkPicture parentWBWB;
     canvas = parentWBWB.beginRecording(10, 10);
     canvas->drawBitmap(bm, 0, 0);
     canvas->drawPicture(childWithBitmap);
     parentWBWB.endRecording();
     REPORTER_ASSERT(reporter, parentWBWB.willPlayBackBitmaps()); // 2
 }
 
+static void test_gen_id(skiatest::Reporter* reporter) {
+
+    SkPicture hasData, empty, midRecord;
+
+    uint32_t beforeID = hasData.getGenerationID();
+    REPORTER_ASSERT(reporter, SkPicture::kInvalidGenID != beforeID);
+
+    // all 3 pictures should have different ids
+    REPORTER_ASSERT(reporter, beforeID != empty.getGenerationID());
+    REPORTER_ASSERT(reporter, beforeID != midRecord.getGenerationID());
+    REPORTER_ASSERT(reporter, empty.getGenerationID() != midRecord.getGenerationID());
+
+    hasData.beginRecording(1, 1);
+    // gen ID should be invalid mid-record
+    REPORTER_ASSERT(reporter, SkPicture::kInvalidGenID == hasData.getGenerationID());
+    hasData.endRecording();
+    // picture should get a new (non-zero) id after recording
+    REPORTER_ASSERT(reporter, hasData.getGenerationID() != beforeID);
+    REPORTER_ASSERT(reporter, hasData.getGenerationID() != SkPicture::kInvalidGenID);
+
+    midRecord.beginRecording(1, 1);
+    REPORTER_ASSERT(reporter, SkPicture::kInvalidGenID == midRecord.getGenerationID());
+
+    // test out copy constructor
+    SkPicture copyWithData(hasData);
+    REPORTER_ASSERT(reporter, hasData.getGenerationID() == copyWithData.getGenerationID());
+
+    SkPicture emptyCopy(empty);
+    REPORTER_ASSERT(reporter, empty.getGenerationID() != emptyCopy.getGenerationID());
+    
+    SkPicture copyMidRecord(midRecord);
+    REPORTER_ASSERT(reporter, midRecord.getGenerationID() != copyMidRecord.getGenerationID());
+    REPORTER_ASSERT(reporter, copyMidRecord.getGenerationID() != SkPicture::kInvalidGenID);
+
+    // test out swap
+    beforeID = copyMidRecord.getGenerationID();
+    copyWithData.swap(copyMidRecord);
+    REPORTER_ASSERT(reporter, copyWithData.getGenerationID() == beforeID);
+    REPORTER_ASSERT(reporter, copyMidRecord.getGenerationID() == hasData.getGenerationID());
+
+    // test out clone
+    SkAutoTUnref<SkPicture> cloneWithData(hasData.clone());
+    REPORTER_ASSERT(reporter, hasData.getGenerationID() == cloneWithData->getGenerationID());
+
+    SkAutoTUnref<SkPicture> emptyClone(empty.clone());
+    REPORTER_ASSERT(reporter, empty.getGenerationID() != emptyClone->getGenerationID());
+
+    SkAutoTUnref<SkPicture> cloneMidRecord(midRecord.clone());
+    REPORTER_ASSERT(reporter, midRecord.getGenerationID() != cloneMidRecord->getGenerationID());
+    REPORTER_ASSERT(reporter, cloneMidRecord->getGenerationID() != SkPicture::kInvalidGenID);
+}
+
 DEF_TEST(Picture, reporter) {
 #ifdef SK_DEBUG
     test_deleting_empty_playback();
     test_serializing_empty_picture();
 #else
     test_bad_bitmap();
 #endif
     test_unbalanced_save_restores(reporter);
     test_peephole();
     test_gatherpixelrefs(reporter);
     test_gatherpixelrefsandrects(reporter);
     test_bitmap_with_encoded_data(reporter);
     test_clone_empty(reporter);
     test_draw_empty(reporter);
     test_clip_bound_opt(reporter);
     test_clip_expansion(reporter);
     test_hierarchical(reporter);
+    test_gen_id(reporter);
 }
 
 static void draw_bitmaps(const SkBitmap bitmap, SkCanvas* canvas) {
     const SkPaint paint;
     const SkRect rect = { 5.0f, 5.0f, 8.0f, 8.0f };
     const SkIRect irect =  { 2, 2, 3, 3 };
 
     // Don't care what these record, as long as they're legal.
     canvas->drawBitmap(bitmap, 0.0f, 0.0f, &paint);
     canvas->drawBitmapRectToRect(bitmap, &rect, rect, &paint, SkCanvas::kNone_DrawBitmapRectFlag);
@@ skipping 15 matching lines @@
     picture.endRecording();
 }
 
 DEF_TEST(Canvas_EmptyBitmap, r) {
     SkBitmap dst;
     dst.allocN32Pixels(10, 10);
     SkCanvas canvas(dst);
 
     test_draw_bitmaps(&canvas);
 }