DM: add --serialize

dm/DMSerializeTask.cpp

Index: dm/DMSerializeTask.cpp
diff --git a/dm/DMSerializeTask.cpp b/dm/DMSerializeTask.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d71dfdccfa2e03cc681716b66bb32dbba547648f
--- /dev/null
+++ b/dm/DMSerializeTask.cpp
@@ -0,0 +1,53 @@
+#include "DMSerializeTask.h"
+#include "DMUtil.h"
+#include "DMWriteTask.h"
+
+#include "SkCommandLineFlags.h"
+#include "SkPicture.h"
+#include "SkPixelRef.h"
+
+DEFINE_bool(serialize, false, "If true, run picture serialization tests.");
+
+namespace DM {
+
+SerializeTask::SerializeTask(const Task& parent,
+                             skiagm::GM* gm,
+                             SkBitmap reference)
+    : Task(parent)
+    , fName(UnderJoin(parent.name().c_str(), "serialize"))
+    , fGM(gm)
+    , fReference(reference)
+    {}
+
+static SkData* trivial_bitmap_encoder(size_t* pixelRefOffset, const SkBitmap& bitmap) {
+    if (NULL == bitmap.pixelRef()) {
+        return NULL;
+    }
+    SkData* data = bitmap.pixelRef()->refEncodedData();
+    *pixelRefOffset = bitmap.pixelRefOffset();
+    return data;
+}
+
+void SerializeTask::draw() {
+    SkPicture recorded;
+    RecordPicture(fGM.get(), &recorded);
+
+    SkDynamicMemoryWStream wStream;
+    recorded.serialize(&wStream, &trivial_bitmap_encoder);
+    SkAutoTUnref<SkStream> rStream(wStream.detachAsStream());
+    SkAutoTUnref<SkPicture> reconstructed(SkPicture::CreateFromStream(rStream));
+
+    SkBitmap bitmap;
+    SetupBitmap(fReference.config(), fGM.get(), &bitmap);
+    DrawPicture(reconstructed, &bitmap);
+    if (!BitmapsEqual(bitmap, fReference)) {
+        this->fail();
+        this->spawnChild(SkNEW_ARGS(WriteTask, (*this, bitmap)));
+    }
+}
+
+bool SerializeTask::shouldSkip() const {
+    return !FLAGS_serialize || fGM->getFlags() & skiagm::GM::kSkipPicture_Flag;
+}
+
+}  // namespace DM