change pixel-serializer to support reencoding existing data

src/core/SkWriteBuffer.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 "SkWriteBuffer.h"
 #include "SkBitmap.h"
@@ skipping 168 matching lines @@
         // unflattened (i.e. stale) instance of a similar flattenable is in the dictionary
         // and the instance currently being written is re-using the same slot from the
         // bitmap heap.
         fWriter.write32(bitmap.getGenerationID());
         return;
     }
 
     SkPixelRef* pixelRef = bitmap.pixelRef();
     if (pixelRef) {
         // see if the pixelref already has an encoded version
-        SkAutoDataUnref existingData(pixelRef->refEncodedData());
-        if (existingData.get() != nullptr) {
+        SkAutoDataUnref encodedData(pixelRef->refEncodedData());
+        if (encodedData) {
             // Assumes that if the client did not set a serializer, they are
             // happy to get the encoded data.
-            if (!fPixelSerializer || fPixelSerializer->useEncodedData(existingData->data(),
-                                                                      existingData->size())) {
-                write_encoded_bitmap(this, existingData, bitmap.pixelRefOrigin());
+            if (fPixelSerializer) {
+                encodedData.reset(fPixelSerializer->reencodeData(encodedData));
+            }
+            if (encodedData) {
+                write_encoded_bitmap(this, encodedData, bitmap.pixelRefOrigin());
                 return;
             }
         }
 
         // see if the caller wants to manually encode
         SkAutoPixmapUnlock result;
         if (fPixelSerializer && bitmap.requestLock(&result)) {
-            const SkPixmap& pmap = result.pixmap();
             SkASSERT(nullptr == fBitmapHeap);
-            SkAutoDataUnref data(fPixelSerializer->encodePixels(pmap.info(),
-                                                                pmap.addr(),
-                                                                pmap.rowBytes()));
-            if (data.get() != nullptr) {
+            SkAutoDataUnref data(fPixelSerializer->encodePixels(result.pixmap()));
+            if (data) {
                 // if we have to "encode" the bitmap, then we assume there is no
                 // offset to share, since we are effectively creating a new pixelref
                 write_encoded_bitmap(this, data, SkIPoint::Make(0, 0));
                 return;
             }
         }
     }
 
     this->writeUInt(0); // signal raw pixels
     SkBitmap::WriteRawPixels(this, bitmap);
@@ skipping 115 matching lines @@
     // make room for the size of the flattened object
     (void)fWriter.reserve(sizeof(uint32_t));
     // record the current size, so we can subtract after the object writes.
     size_t offset = fWriter.bytesWritten();
     // now flatten the object
     flattenable->flatten(*this);
     size_t objSize = fWriter.bytesWritten() - offset;
     // record the obj's size
     fWriter.overwriteTAt(offset - sizeof(uint32_t), SkToU32(objSize));
 }