change old picture serialization to really handle images

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 200 matching lines @@
                 write_encoded_bitmap(this, data, SkIPoint::Make(0, 0));
                 return;
             }
         }
     }
 
     this->writeUInt(0); // signal raw pixels
     SkBitmap::WriteRawPixels(this, bitmap);
 }
 
+static bool try_write_encoded(SkWriteBuffer* buffer, SkData* encoded, SkIPoint origin) {
+    SkPixelSerializer* ps = buffer->getPixelSerializer();
+    // Assumes that if the client did not set a serializer, they are
+    // happy to get the encoded data.
+    if (!ps || ps->useEncodedData(encoded->data(), encoded->size())) {
+        write_encoded_bitmap(buffer, encoded, origin);
+        return true;
+    }
+    return false;
+}
+
+void SkWriteBuffer::writeImage(const SkImage* image) {
+    this->writeInt(image->width());
+    this->writeInt(image->height());
+
+    SkIPoint origin;
+    SkAutoTUnref<SkData> encoded(image->refEncodedData(&origin));
+    if (encoded && try_write_encoded(this, encoded, origin)) {
+        return;
+    }
+
+    encoded.reset(image->encode(SkImageEncoder::kPNG_Type, 100));
+    if (encoded && try_write_encoded(this, encoded, SkIPoint::Make(0, 0))) {
+        return;
+    }
+    
+    this->writeUInt(0); // signal no pixels
+}
+
 void SkWriteBuffer::writeTypeface(SkTypeface* obj) {
     if (NULL == obj || NULL == fTFSet) {
         fWriter.write32(0);
     } else {
         fWriter.write32(fTFSet->add(obj));
     }
 }
 
 SkFactorySet* SkWriteBuffer::setFactoryRecorder(SkFactorySet* rec) {
     SkRefCnt_SafeAssign(fFactorySet, rec);
@@ skipping 90 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));
 }