Prototype code that turns any/every flattenable into JSON

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"
 #include "SkBitmapHeap.h"
 #include "SkData.h"
 #include "SkPixelRef.h"
 #include "SkPtrRecorder.h"
 #include "SkStream.h"
 #include "SkTypeface.h"
 
-SkWriteBuffer::SkWriteBuffer(uint32_t flags)
+SkBinaryWriteBuffer::SkBinaryWriteBuffer(uint32_t flags)
     : fFlags(flags)
     , fFactorySet(nullptr)
     , fBitmapHeap(nullptr)
     , fTFSet(nullptr) {
 }
 
-SkWriteBuffer::SkWriteBuffer(void* storage, size_t storageSize, uint32_t flags)
+SkBinaryWriteBuffer::SkBinaryWriteBuffer(void* storage, size_t storageSize, uint32_t flags)
     : fFlags(flags)
     , fFactorySet(nullptr)
     , fWriter(storage, storageSize)
     , fBitmapHeap(nullptr)
     , fTFSet(nullptr) {
 }
 
-SkWriteBuffer::~SkWriteBuffer() {
+SkBinaryWriteBuffer::~SkBinaryWriteBuffer() {
     SkSafeUnref(fFactorySet);
     SkSafeUnref(fBitmapHeap);
     SkSafeUnref(fTFSet);
 }
 
-void SkWriteBuffer::writeByteArray(const void* data, size_t size) {
+void SkBinaryWriteBuffer::writeByteArray(const void* data, size_t size) {
     fWriter.write32(SkToU32(size));
     fWriter.writePad(data, size);
 }
 
-void SkWriteBuffer::writeBool(bool value) {
+void SkBinaryWriteBuffer::writeDataAsByteArray(SkData* data) {
+    this->writeByteArray(data->data(), data->size());
+}
+
+void SkBinaryWriteBuffer::writeBool(bool value) {
     fWriter.writeBool(value);
 }
 
-void SkWriteBuffer::writeScalar(SkScalar value) {
+void SkBinaryWriteBuffer::writeScalar(SkScalar value) {
     fWriter.writeScalar(value);
 }
 
-void SkWriteBuffer::writeScalarArray(const SkScalar* value, uint32_t count) {
+void SkBinaryWriteBuffer::writeScalarArray(const SkScalar* value, uint32_t count) {
     fWriter.write32(count);
     fWriter.write(value, count * sizeof(SkScalar));
 }
 
-void SkWriteBuffer::writeInt(int32_t value) {
+void SkBinaryWriteBuffer::writeInt(int32_t value) {
     fWriter.write32(value);
 }
 
-void SkWriteBuffer::writeIntArray(const int32_t* value, uint32_t count) {
+void SkBinaryWriteBuffer::writeIntArray(const int32_t* value, uint32_t count) {
     fWriter.write32(count);
     fWriter.write(value, count * sizeof(int32_t));
 }
 
-void SkWriteBuffer::writeUInt(uint32_t value) {
+void SkBinaryWriteBuffer::writeUInt(uint32_t value) {
     fWriter.write32(value);
 }
 
-void SkWriteBuffer::write32(int32_t value) {
+void SkBinaryWriteBuffer::write32(int32_t value) {
     fWriter.write32(value);
 }
 
-void SkWriteBuffer::writeString(const char* value) {
+void SkBinaryWriteBuffer::writeString(const char* value) {
     fWriter.writeString(value);
 }
 
-void SkWriteBuffer::writeEncodedString(const void* value, size_t byteLength,
+void SkBinaryWriteBuffer::writeEncodedString(const void* value, size_t byteLength,
                                               SkPaint::TextEncoding encoding) {
     fWriter.writeInt(encoding);
     fWriter.writeInt(SkToU32(byteLength));
     fWriter.write(value, byteLength);
 }
 
+void SkBinaryWriteBuffer::writeFunctionPtr(void* ptr) {
+    fWriter.writePtr(ptr);
+}
 
-void SkWriteBuffer::writeColor(const SkColor& color) {
+void SkBinaryWriteBuffer::writeColor(const SkColor& color) {
     fWriter.write32(color);
 }
 
-void SkWriteBuffer::writeColorArray(const SkColor* color, uint32_t count) {
+void SkBinaryWriteBuffer::writeColorArray(const SkColor* color, uint32_t count) {
     fWriter.write32(count);
     fWriter.write(color, count * sizeof(SkColor));
 }
 
-void SkWriteBuffer::writePoint(const SkPoint& point) {
+void SkBinaryWriteBuffer::writePoint(const SkPoint& point) {
     fWriter.writeScalar(point.fX);
     fWriter.writeScalar(point.fY);
 }
 
-void SkWriteBuffer::writePointArray(const SkPoint* point, uint32_t count) {
+void SkBinaryWriteBuffer::writePointArray(const SkPoint* point, uint32_t count) {
     fWriter.write32(count);
     fWriter.write(point, count * sizeof(SkPoint));
 }
 
-void SkWriteBuffer::writeMatrix(const SkMatrix& matrix) {
+void SkBinaryWriteBuffer::writeMatrix(const SkMatrix& matrix) {
     fWriter.writeMatrix(matrix);
 }
 
-void SkWriteBuffer::writeIRect(const SkIRect& rect) {
+void SkBinaryWriteBuffer::writeIRect(const SkIRect& rect) {
     fWriter.write(&rect, sizeof(SkIRect));
 }
 
-void SkWriteBuffer::writeRect(const SkRect& rect) {
+void SkBinaryWriteBuffer::writeRect(const SkRect& rect) {
     fWriter.writeRect(rect);
 }
 
-void SkWriteBuffer::writeRegion(const SkRegion& region) {
+void SkBinaryWriteBuffer::writeRegion(const SkRegion& region) {
     fWriter.writeRegion(region);
 }
 
-void SkWriteBuffer::writePath(const SkPath& path) {
+void SkBinaryWriteBuffer::writePath(const SkPath& path) {
     fWriter.writePath(path);
 }
 
-size_t SkWriteBuffer::writeStream(SkStream* stream, size_t length) {
+size_t SkBinaryWriteBuffer::writeStream(SkStream* stream, size_t length) {
     fWriter.write32(SkToU32(length));
     size_t bytesWritten = fWriter.readFromStream(stream, length);
     if (bytesWritten < length) {
         fWriter.reservePad(length - bytesWritten);
     }
     return bytesWritten;
 }
 
-bool SkWriteBuffer::writeToStream(SkWStream* stream) {
+bool SkBinaryWriteBuffer::writeToStream(SkWStream* stream) {
     return fWriter.writeToStream(stream);
 }
 
-static void write_encoded_bitmap(SkWriteBuffer* buffer, SkData* data,
+static void write_encoded_bitmap(SkBinaryWriteBuffer* buffer, SkData* data,
                                  const SkIPoint& origin) {
     buffer->writeUInt(SkToU32(data->size()));
     buffer->getWriter32()->writePad(data->data(), data->size());
     buffer->write32(origin.fX);
     buffer->write32(origin.fY);
 }
 
-void SkWriteBuffer::writeBitmap(const SkBitmap& bitmap) {
+void SkBinaryWriteBuffer::writeBitmap(const SkBitmap& bitmap) {
     // Record the width and height. This way if readBitmap fails a dummy bitmap can be drawn at the
     // right size.
     this->writeInt(bitmap.width());
     this->writeInt(bitmap.height());
 
     // Record information about the bitmap in one of three ways, in order of priority:
     // 1. If there is an SkBitmapHeap, store it in the heap. The client can avoid serializing the
     //    bitmap entirely or serialize it later as desired. A boolean value of true will be written
     //    to the stream to signify that a heap was used.
     // 2. If there is a function for encoding bitmaps, use it to write an encoded version of the
@@ skipping 44 matching lines @@
                 write_encoded_bitmap(this, data, SkIPoint::Make(0, 0));
                 return;
             }
         }
     }
 
     this->writeUInt(0); // signal raw pixels
     SkBitmap::WriteRawPixels(this, bitmap);
 }
 
-void SkWriteBuffer::writeImage(const SkImage* image) {
+void SkBinaryWriteBuffer::writeImage(const SkImage* image) {
     this->writeInt(image->width());
     this->writeInt(image->height());
 
     SkAutoTUnref<SkData> encoded(image->encode(this->getPixelSerializer()));
     if (encoded && encoded->size() > 0) {
         write_encoded_bitmap(this, encoded, SkIPoint::Make(0, 0));
         return;
     }
 
     this->writeUInt(0); // signal no pixels (in place of the size of the encoded data)
 }
 
-void SkWriteBuffer::writeTypeface(SkTypeface* obj) {
+void SkBinaryWriteBuffer::writeTypeface(SkTypeface* obj) {
     if (nullptr == obj || nullptr == fTFSet) {
         fWriter.write32(0);
     } else {
         fWriter.write32(fTFSet->add(obj));
     }
 }
 
-SkFactorySet* SkWriteBuffer::setFactoryRecorder(SkFactorySet* rec) {
+void SkBinaryWriteBuffer::writePaint(const SkPaint& paint) {
+    paint.flatten(*this);
+}
+
+SkFactorySet* SkBinaryWriteBuffer::setFactoryRecorder(SkFactorySet* rec) {
     SkRefCnt_SafeAssign(fFactorySet, rec);
     return rec;
 }
 
-SkRefCntSet* SkWriteBuffer::setTypefaceRecorder(SkRefCntSet* rec) {
+SkRefCntSet* SkBinaryWriteBuffer::setTypefaceRecorder(SkRefCntSet* rec) {
     SkRefCnt_SafeAssign(fTFSet, rec);
     return rec;
 }
 
-void SkWriteBuffer::setBitmapHeap(SkBitmapHeap* bitmapHeap) {
+void SkBinaryWriteBuffer::setBitmapHeap(SkBitmapHeap* bitmapHeap) {
     SkRefCnt_SafeAssign(fBitmapHeap, bitmapHeap);
     if (bitmapHeap != nullptr) {
         SkASSERT(nullptr == fPixelSerializer);
         fPixelSerializer.reset(nullptr);
     }
 }
 
-void SkWriteBuffer::setPixelSerializer(SkPixelSerializer* serializer) {
+void SkBinaryWriteBuffer::setPixelSerializer(SkPixelSerializer* serializer) {
     fPixelSerializer.reset(serializer);
     if (serializer) {
         serializer->ref();
         SkASSERT(nullptr == fBitmapHeap);
         SkSafeUnref(fBitmapHeap);
         fBitmapHeap = nullptr;
     }
 }
 
-void SkWriteBuffer::writeFlattenable(const SkFlattenable* flattenable) {
+void SkBinaryWriteBuffer::writeFlattenable(const SkFlattenable* flattenable) {
     /*
      *  The first 32 bits tell us...
      *       0: failure to write the flattenable
      *      >0: index (1-based) into fFactorySet or fFlattenableDict or
      *          the first character of a string
      */
     if (nullptr == flattenable) {
         this->write32(0);
         return;
     }
@@ skipping 40 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));
 }