src/core/SkPictureData.cpp - skia - Git at Google

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include <new>

 #include "SkAutoMalloc.h"
 #include "SkImageGenerator.h"
 #include "SkPictureData.h"
 #include "SkPictureRecord.h"
 #include "SkReadBuffer.h"
 #include "SkTextBlob.h"
 #include "SkTypeface.h"
 #include "SkWriteBuffer.h"

 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #endif

 template <typename T> int SafeCount(const T* obj) {
     return obj ? obj->count() : 0;
 }

 SkPictureData::SkPictureData(const SkPictInfo& info)
     : fInfo(info) {
     this->init();
 }

 void SkPictureData::initForPlayback() const {
     // ensure that the paths bounds are pre-computed
     for (int i = 0; i < fPaths.count(); i++) {
         fPaths[i].updateBoundsCache();
     }
 }

 SkPictureData::SkPictureData(const SkPictureRecord& record,
                              const SkPictInfo& info)
     : fInfo(info) {

     this->init();

     fOpData = record.opData();

     fPaints  = record.fPaints;

     fPaths.reset(record.fPaths.count());
     record.fPaths.foreach([this](const SkPath& path, int n) {
         // These indices are logically 1-based, but we need to serialize them
         // 0-based to keep the deserializing SkPictureData::getPath() working.
         fPaths[n-1] = path;
     });

     this->initForPlayback();

     const SkTDArray<const SkPicture* >& pictures = record.getPictureRefs();
     fPictureCount = pictures.count();
     if (fPictureCount > 0) {
         fPictureRefs = new const SkPicture* [fPictureCount];
         for (int i = 0; i < fPictureCount; i++) {
             fPictureRefs[i] = pictures[i];
             fPictureRefs[i]->ref();
         }
     }

     const SkTDArray<SkDrawable* >& drawables = record.getDrawableRefs();
     fDrawableCount = drawables.count();
     if (fDrawableCount > 0) {
         fDrawableRefs = new SkDrawable* [fDrawableCount];
         for (int i = 0; i < fDrawableCount; i++) {
             fDrawableRefs[i] = drawables[i];
             fDrawableRefs[i]->ref();
         }
     }

     // templatize to consolidate with similar picture logic?
     const SkTDArray<const SkTextBlob*>& blobs = record.getTextBlobRefs();
     fTextBlobCount = blobs.count();
     if (fTextBlobCount > 0) {
         fTextBlobRefs = new const SkTextBlob* [fTextBlobCount];
         for (int i = 0; i < fTextBlobCount; ++i) {
             fTextBlobRefs[i] = SkRef(blobs[i]);
         }
     }

     const SkTDArray<const SkVertices*>& verts = record.getVerticesRefs();
     fVerticesCount = verts.count();
     if (fVerticesCount > 0) {
         fVerticesRefs = new const SkVertices* [fVerticesCount];
         for (int i = 0; i < fVerticesCount; ++i) {
             fVerticesRefs[i] = SkRef(verts[i]);
         }
     }

     const SkTDArray<const SkImage*>& imgs = record.getImageRefs();
     fImageCount = imgs.count();
     if (fImageCount > 0) {
         fImageRefs = new const SkImage* [fImageCount];
         for (int i = 0; i < fImageCount; ++i) {
             fImageRefs[i] = SkRef(imgs[i]);
         }
     }
 }

 void SkPictureData::init() {
     fPictureRefs = nullptr;
     fPictureCount = 0;
     fDrawableRefs = nullptr;
     fDrawableCount = 0;
     fTextBlobRefs = nullptr;
     fTextBlobCount = 0;
     fVerticesRefs = nullptr;
     fVerticesCount = 0;
     fImageRefs = nullptr;
     fImageCount = 0;
     fBitmapImageCount = 0;
     fBitmapImageRefs = nullptr;
     fFactoryPlayback = nullptr;
 }

 SkPictureData::~SkPictureData() {
     for (int i = 0; i < fPictureCount; i++) {
         fPictureRefs[i]->unref();
     }
     delete[] fPictureRefs;

     for (int i = 0; i < fDrawableCount; i++) {
         fDrawableRefs[i]->unref();
     }
     if (fDrawableCount > 0) {
         SkASSERT(fDrawableRefs);
         delete[] fDrawableRefs;
     }

     for (int i = 0; i < fTextBlobCount; i++) {
         fTextBlobRefs[i]->unref();
     }
     delete[] fTextBlobRefs;

     for (int i = 0; i < fVerticesCount; i++) {
         fVerticesRefs[i]->unref();
     }
     delete[] fVerticesRefs;

     for (int i = 0; i < fImageCount; i++) {
         fImageRefs[i]->unref();
     }
     delete[] fImageRefs;

     delete fFactoryPlayback;
 }

 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////

 #include "SkStream.h"

 static size_t compute_chunk_size(SkFlattenable::Factory* array, int count) {
     size_t size = 4;  // for 'count'

     for (int i = 0; i < count; i++) {
         const char* name = SkFlattenable::FactoryToName(array[i]);
         if (nullptr == name || 0 == *name) {
             size += SkWStream::SizeOfPackedUInt(0);
         } else {
             size_t len = strlen(name);
             size += SkWStream::SizeOfPackedUInt(len);
             size += len;
         }
     }

     return size;
 }

 static void write_tag_size(SkWriteBuffer& buffer, uint32_t tag, size_t size) {
     buffer.writeUInt(tag);
     buffer.writeUInt(SkToU32(size));
 }

 static void write_tag_size(SkWStream* stream, uint32_t tag, size_t size) {
     stream->write32(tag);
     stream->write32(SkToU32(size));
 }

 void SkPictureData::WriteFactories(SkWStream* stream, const SkFactorySet& rec) {
     int count = rec.count();

     SkAutoSTMalloc<16, SkFlattenable::Factory> storage(count);
     SkFlattenable::Factory* array = (SkFlattenable::Factory*)storage.get();
     rec.copyToArray(array);

     size_t size = compute_chunk_size(array, count);

     // TODO: write_tag_size should really take a size_t
     write_tag_size(stream, SK_PICT_FACTORY_TAG, (uint32_t) size);
     SkDEBUGCODE(size_t start = stream->bytesWritten());
     stream->write32(count);

     for (int i = 0; i < count; i++) {
         const char* name = SkFlattenable::FactoryToName(array[i]);
         if (nullptr == name || 0 == *name) {
             stream->writePackedUInt(0);
         } else {
             size_t len = strlen(name);
             stream->writePackedUInt(len);
             stream->write(name, len);
         }
     }

     SkASSERT(size == (stream->bytesWritten() - start));
 }

 void SkPictureData::WriteTypefaces(SkWStream* stream, const SkRefCntSet& rec) {
     int count = rec.count();

     write_tag_size(stream, SK_PICT_TYPEFACE_TAG, count);

     SkAutoSTMalloc<16, SkTypeface*> storage(count);
     SkTypeface** array = (SkTypeface**)storage.get();
     rec.copyToArray((SkRefCnt**)array);

     for (int i = 0; i < count; i++) {
         array[i]->serialize(stream);
     }
 }

 void SkPictureData::flattenToBuffer(SkWriteBuffer& buffer) const {
     int i, n;

     if ((n = fPaints.count()) > 0) {
         write_tag_size(buffer, SK_PICT_PAINT_BUFFER_TAG, n);
         for (i = 0; i < n; i++) {
             buffer.writePaint(fPaints[i]);
         }
     }

     if ((n = fPaths.count()) > 0) {
         write_tag_size(buffer, SK_PICT_PATH_BUFFER_TAG, n);
         buffer.writeInt(n);
         for (int i = 0; i < n; i++) {
             buffer.writePath(fPaths[i]);
         }
     }

     if (fTextBlobCount > 0) {
         write_tag_size(buffer, SK_PICT_TEXTBLOB_BUFFER_TAG, fTextBlobCount);
         for (i = 0; i  < fTextBlobCount; ++i) {
             fTextBlobRefs[i]->flatten(buffer);
         }
     }

     if (fVerticesCount > 0) {
         write_tag_size(buffer, SK_PICT_VERTICES_BUFFER_TAG, fVerticesCount);
         for (i = 0; i  < fVerticesCount; ++i) {
             buffer.writeDataAsByteArray(fVerticesRefs[i]->encode().get());
         }
     }

     if (fImageCount > 0) {
         write_tag_size(buffer, SK_PICT_IMAGE_BUFFER_TAG, fImageCount);
         for (i = 0; i  < fImageCount; ++i) {
             buffer.writeImage(fImageRefs[i]);
         }
     }
 }

 void SkPictureData::serialize(SkWStream* stream, const SkSerialProcs& procs,
                               SkRefCntSet* topLevelTypeFaceSet) const {
     // This can happen at pretty much any time, so might as well do it first.
     write_tag_size(stream, SK_PICT_READER_TAG, fOpData->size());
     stream->write(fOpData->bytes(), fOpData->size());

     // We serialize all typefaces into the typeface section of the top-level picture.
     SkRefCntSet localTypefaceSet;
     SkRefCntSet* typefaceSet = topLevelTypeFaceSet ? topLevelTypeFaceSet : &localTypefaceSet;

     // We delay serializing the bulk of our data until after we've serialized
     // factories and typefaces by first serializing to an in-memory write buffer.
     SkFactorySet factSet;  // buffer refs factSet, so factSet must come first.
     SkBinaryWriteBuffer buffer;
     buffer.setFactoryRecorder(&factSet);
     buffer.setSerialProcs(procs);
     buffer.setTypefaceRecorder(typefaceSet);
     this->flattenToBuffer(buffer);

     // Dummy serialize our sub-pictures for the side effect of filling
     // typefaceSet with typefaces from sub-pictures.
     struct DevNull: public SkWStream {
         DevNull() : fBytesWritten(0) {}
         size_t fBytesWritten;
         bool write(const void*, size_t size) override { fBytesWritten += size; return true; }
         size_t bytesWritten() const override { return fBytesWritten; }
     } devnull;
     for (int i = 0; i < fPictureCount; i++) {
         fPictureRefs[i]->serialize(&devnull, nullptr, typefaceSet);
     }

     // We need to write factories before we write the buffer.
     // We need to write typefaces before we write the buffer or any sub-picture.
     WriteFactories(stream, factSet);
     if (typefaceSet == &localTypefaceSet) {
         WriteTypefaces(stream, *typefaceSet);
     }

     // Write the buffer.
     write_tag_size(stream, SK_PICT_BUFFER_SIZE_TAG, buffer.bytesWritten());
     buffer.writeToStream(stream);

     // Write sub-pictures by calling serialize again.
     if (fPictureCount > 0) {
         write_tag_size(stream, SK_PICT_PICTURE_TAG, fPictureCount);
         for (int i = 0; i < fPictureCount; i++) {
             fPictureRefs[i]->serialize(stream, &procs, typefaceSet);
         }
     }

     stream->write32(SK_PICT_EOF_TAG);
 }

 void SkPictureData::flatten(SkWriteBuffer& buffer) const {
     write_tag_size(buffer, SK_PICT_READER_TAG, fOpData->size());
     buffer.writeByteArray(fOpData->bytes(), fOpData->size());

     if (fPictureCount > 0) {
         write_tag_size(buffer, SK_PICT_PICTURE_TAG, fPictureCount);
         for (int i = 0; i < fPictureCount; i++) {
             fPictureRefs[i]->flatten(buffer);
         }
     }

     if (fDrawableCount > 0) {
         write_tag_size(buffer, SK_PICT_DRAWABLE_TAG, fDrawableCount);
         for (int i = 0; i < fDrawableCount; i++) {
             buffer.writeFlattenable(fDrawableRefs[i]);
         }
     }

     // Write this picture playback's data into a writebuffer
     this->flattenToBuffer(buffer);
     buffer.write32(SK_PICT_EOF_TAG);
 }

 ///////////////////////////////////////////////////////////////////////////////

 bool SkPictureData::parseStreamTag(SkStream* stream,
                                    uint32_t tag,
                                    uint32_t size,
                                    const SkDeserialProcs& procs,
                                    SkTypefacePlayback* topLevelTFPlayback) {
     /*
      *  By the time we encounter BUFFER_SIZE_TAG, we need to have already seen
      *  its dependents: FACTORY_TAG and TYPEFACE_TAG. These two are not required
      *  but if they are present, they need to have been seen before the buffer.
      *
      *  We assert that if/when we see either of these, that we have not yet seen
      *  the buffer tag, because if we have, then its too-late to deal with the
      *  factories or typefaces.
      */
     SkDEBUGCODE(bool haveBuffer = false;)

     switch (tag) {
         case SK_PICT_READER_TAG:
             SkASSERT(nullptr == fOpData);
             fOpData = SkData::MakeFromStream(stream, size);
             if (!fOpData) {
                 return false;
             }
             break;
         case SK_PICT_FACTORY_TAG: {
             SkASSERT(!haveBuffer);
             size = stream->readU32();
             fFactoryPlayback = new SkFactoryPlayback(size);
             for (size_t i = 0; i < size; i++) {
                 SkString str;
                 const size_t len = stream->readPackedUInt();
                 str.resize(len);
                 if (stream->read(str.writable_str(), len) != len) {
                     return false;
                 }
                 fFactoryPlayback->base()[i] = SkFlattenable::NameToFactory(str.c_str());
             }
         } break;
         case SK_PICT_TYPEFACE_TAG: {
             SkASSERT(!haveBuffer);
             const int count = SkToInt(size);
             fTFPlayback.setCount(count);
             for (int i = 0; i < count; i++) {
                 sk_sp<SkTypeface> tf(SkTypeface::MakeDeserialize(stream));
                 if (!tf.get()) {    // failed to deserialize
                     // fTFPlayback asserts it never has a null, so we plop in
                     // the default here.
                     tf = SkTypeface::MakeDefault();
                 }
                 fTFPlayback.set(i, tf.get());
             }
         } break;
         case SK_PICT_PICTURE_TAG: {
             fPictureCount = 0;
             fPictureRefs = new const SkPicture* [size];
             for (uint32_t i = 0; i < size; i++) {
                 fPictureRefs[i] = SkPicture::MakeFromStream(stream, &procs, topLevelTFPlayback).release();
                 if (!fPictureRefs[i]) {
                     return false;
                 }
                 fPictureCount++;
             }
         } break;
         case SK_PICT_BUFFER_SIZE_TAG: {
             SkAutoMalloc storage(size);
             if (stream->read(storage.get(), size) != size) {
                 return false;
             }

             SkReadBuffer buffer(storage.get(), size);
             buffer.setVersion(fInfo.getVersion());

             if (!fFactoryPlayback) {
                 return false;
             }
             fFactoryPlayback->setupBuffer(buffer);
             buffer.setDeserialProcs(procs);

             if (fTFPlayback.count() > 0) {
                 // .skp files <= v43 have typefaces serialized with each sub picture.
                 fTFPlayback.setupBuffer(buffer);
             } else {
                 // Newer .skp files serialize all typefaces with the top picture.
                 topLevelTFPlayback->setupBuffer(buffer);
             }

             while (!buffer.eof() && buffer.isValid()) {
                 tag = buffer.readUInt();
                 size = buffer.readUInt();
                 this->parseBufferTag(buffer, tag, size);
             }
             if (!buffer.isValid()) {
                 return false;
             }
             SkDEBUGCODE(haveBuffer = true;)
         } break;
     }
     return true;    // success
 }

 static sk_sp<SkImage> create_image_from_buffer(SkReadBuffer& buffer) {
     return buffer.readImage();
 }
 static sk_sp<SkVertices> create_vertices_from_buffer(SkReadBuffer& buffer) {
     auto data = buffer.readByteArrayAsData();
     return data ? SkVertices::Decode(data->data(), data->size()) : nullptr;
 }

 static sk_sp<SkDrawable> create_drawable_from_buffer(SkReadBuffer& buffer) {
     return sk_sp<SkDrawable>((SkDrawable*)buffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
 }

 template <typename T>
 bool new_array_from_buffer(SkReadBuffer& buffer, uint32_t inCount,
                            const T*** array, int* outCount, sk_sp<T> (*factory)(SkReadBuffer&)) {
     if (!buffer.validate((0 == *outCount) && (nullptr == *array))) {
         return false;
     }
     if (0 == inCount) {
         return true;
     }
     if (!buffer.validate(SkTFitsIn<int>(inCount))) {
         return false;
     }

     *outCount = inCount;
     *array = new const T* [*outCount];
     bool success = true;
     int i = 0;
     for (; i < *outCount; i++) {
         (*array)[i] = factory(buffer).release();
         if (nullptr == (*array)[i]) {
             success = false;
             break;
         }
     }
     if (!success) {
         // Delete all of the blobs that were already created (up to but excluding i):
         for (int j = 0; j < i; j++) {
             (*array)[j]->unref();
         }
         // Delete the array
         delete[] * array;
         *array = nullptr;
         *outCount = 0;
         return buffer.validate(false);
     }
     return true;
 }

 void SkPictureData::parseBufferTag(SkReadBuffer& buffer, uint32_t tag, uint32_t size) {
     switch (tag) {
         case SK_PICT_PAINT_BUFFER_TAG: {
             if (!buffer.validate(SkTFitsIn<int>(size))) {
                 return;
             }
             const int count = SkToInt(size);
             fPaints.reset(count);
             for (int i = 0; i < count; ++i) {
                 if (!buffer.readPaint(&fPaints[i])) {
                     return;
                 }
             }
         } break;
         case SK_PICT_PATH_BUFFER_TAG:
             if (size > 0) {
                 const int count = buffer.readInt();
                 if (!buffer.validate(count >= 0)) {
                     return;
                 }
                 fPaths.reset(count);
                 for (int i = 0; i < count; i++) {
                     buffer.readPath(&fPaths[i]);
                 }
             } break;
         case SK_PICT_TEXTBLOB_BUFFER_TAG:
             new_array_from_buffer(buffer, size, &fTextBlobRefs, &fTextBlobCount,
                                   SkTextBlob::MakeFromBuffer);
             break;
         case SK_PICT_VERTICES_BUFFER_TAG:
             new_array_from_buffer(buffer, size, &fVerticesRefs, &fVerticesCount,
                                   create_vertices_from_buffer);
             break;
         case SK_PICT_IMAGE_BUFFER_TAG:
             new_array_from_buffer(buffer, size, &fImageRefs, &fImageCount,
                                   create_image_from_buffer);
             break;
         case SK_PICT_READER_TAG: {
             auto data(SkData::MakeUninitialized(size));
             if (!buffer.readByteArray(data->writable_data(), size) ||
                 !buffer.validate(nullptr == fOpData)) {
                 return;
             }
             SkASSERT(nullptr == fOpData);
             fOpData = std::move(data);
         } break;
         case SK_PICT_PICTURE_TAG:
             new_array_from_buffer(buffer, size, &fPictureRefs, &fPictureCount,
                                   SkPicture::MakeFromBuffer);
             break;
         case SK_PICT_DRAWABLE_TAG:
             new_array_from_buffer(buffer, size, (const SkDrawable***)&fDrawableRefs,
                                   &fDrawableCount, create_drawable_from_buffer);
             break;
         default:
             buffer.validate(false); // The tag was invalid.
             break;
     }
 }

 SkPictureData* SkPictureData::CreateFromStream(SkStream* stream,
                                                const SkPictInfo& info,
                                                const SkDeserialProcs& procs,
                                                SkTypefacePlayback* topLevelTFPlayback) {
     std::unique_ptr<SkPictureData> data(new SkPictureData(info));
     if (!topLevelTFPlayback) {
         topLevelTFPlayback = &data->fTFPlayback;
     }

     if (!data->parseStream(stream, procs, topLevelTFPlayback)) {
         return nullptr;
     }
     return data.release();
 }

 SkPictureData* SkPictureData::CreateFromBuffer(SkReadBuffer& buffer,
                                                const SkPictInfo& info) {
     std::unique_ptr<SkPictureData> data(new SkPictureData(info));
     buffer.setVersion(info.getVersion());

     if (!data->parseBuffer(buffer)) {
         return nullptr;
     }
     return data.release();
 }

 bool SkPictureData::parseStream(SkStream* stream,
                                 const SkDeserialProcs& procs,
                                 SkTypefacePlayback* topLevelTFPlayback) {
     for (;;) {
         uint32_t tag = stream->readU32();
         if (SK_PICT_EOF_TAG == tag) {
             break;
         }

         uint32_t size = stream->readU32();
         if (!this->parseStreamTag(stream, tag, size, procs, topLevelTFPlayback)) {
             return false; // we're invalid
         }
     }
     return true;
 }

 bool SkPictureData::parseBuffer(SkReadBuffer& buffer) {
     while (buffer.isValid()) {
         uint32_t tag = buffer.readUInt();
         if (SK_PICT_EOF_TAG == tag) {
             break;
         }
         this->parseBufferTag(buffer, tag, buffer.readUInt());
     }

     // Check that we encountered required tags
     if (!buffer.validate(this->opData())) {
         // If we didn't build any opData, we are invalid. Even an EmptyPicture allocates the
         // SkData for the ops (though its length may be zero).
         return false;
     }
     return true;
 }
	/*
	* Copyright 2011 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include <new>

	#include "SkAutoMalloc.h"
	#include "SkImageGenerator.h"
	#include "SkPictureData.h"
	#include "SkPictureRecord.h"
	#include "SkReadBuffer.h"
	#include "SkTextBlob.h"
	#include "SkTypeface.h"
	#include "SkWriteBuffer.h"

	#if SK_SUPPORT_GPU
	#include "GrContext.h"
	#endif

	template <typename T> int SafeCount(const T* obj) {
	return obj ? obj->count() : 0;
	}

	SkPictureData::SkPictureData(const SkPictInfo& info)
	: fInfo(info) {
	this->init();
	}

	void SkPictureData::initForPlayback() const {
	// ensure that the paths bounds are pre-computed
	for (int i = 0; i < fPaths.count(); i++) {
	fPaths[i].updateBoundsCache();
	}
	}

	SkPictureData::SkPictureData(const SkPictureRecord& record,
	const SkPictInfo& info)
	: fInfo(info) {

	this->init();

	fOpData = record.opData();

	fPaints = record.fPaints;

	fPaths.reset(record.fPaths.count());
	record.fPaths.foreach([this](const SkPath& path, int n) {
	// These indices are logically 1-based, but we need to serialize them
	// 0-based to keep the deserializing SkPictureData::getPath() working.
	fPaths[n-1] = path;
	});

	this->initForPlayback();

	const SkTDArray<const SkPicture* >& pictures = record.getPictureRefs();
	fPictureCount = pictures.count();
	if (fPictureCount > 0) {
	fPictureRefs = new const SkPicture* [fPictureCount];
	for (int i = 0; i < fPictureCount; i++) {
	fPictureRefs[i] = pictures[i];
	fPictureRefs[i]->ref();
	}
	}

	const SkTDArray<SkDrawable* >& drawables = record.getDrawableRefs();
	fDrawableCount = drawables.count();
	if (fDrawableCount > 0) {
	fDrawableRefs = new SkDrawable* [fDrawableCount];
	for (int i = 0; i < fDrawableCount; i++) {
	fDrawableRefs[i] = drawables[i];
	fDrawableRefs[i]->ref();
	}
	}

	// templatize to consolidate with similar picture logic?
	const SkTDArray<const SkTextBlob*>& blobs = record.getTextBlobRefs();
	fTextBlobCount = blobs.count();
	if (fTextBlobCount > 0) {
	fTextBlobRefs = new const SkTextBlob* [fTextBlobCount];
	for (int i = 0; i < fTextBlobCount; ++i) {
	fTextBlobRefs[i] = SkRef(blobs[i]);
	}
	}

	const SkTDArray<const SkVertices*>& verts = record.getVerticesRefs();
	fVerticesCount = verts.count();
	if (fVerticesCount > 0) {
	fVerticesRefs = new const SkVertices* [fVerticesCount];
	for (int i = 0; i < fVerticesCount; ++i) {
	fVerticesRefs[i] = SkRef(verts[i]);
	}
	}

	const SkTDArray<const SkImage*>& imgs = record.getImageRefs();
	fImageCount = imgs.count();
	if (fImageCount > 0) {
	fImageRefs = new const SkImage* [fImageCount];
	for (int i = 0; i < fImageCount; ++i) {
	fImageRefs[i] = SkRef(imgs[i]);
	}
	}
	}

	void SkPictureData::init() {
	fPictureRefs = nullptr;
	fPictureCount = 0;
	fDrawableRefs = nullptr;
	fDrawableCount = 0;
	fTextBlobRefs = nullptr;
	fTextBlobCount = 0;
	fVerticesRefs = nullptr;
	fVerticesCount = 0;
	fImageRefs = nullptr;
	fImageCount = 0;
	fBitmapImageCount = 0;
	fBitmapImageRefs = nullptr;
	fFactoryPlayback = nullptr;
	}

	SkPictureData::~SkPictureData() {
	for (int i = 0; i < fPictureCount; i++) {
	fPictureRefs[i]->unref();
	}
	delete[] fPictureRefs;

	for (int i = 0; i < fDrawableCount; i++) {
	fDrawableRefs[i]->unref();
	}
	if (fDrawableCount > 0) {
	SkASSERT(fDrawableRefs);
	delete[] fDrawableRefs;
	}

	for (int i = 0; i < fTextBlobCount; i++) {
	fTextBlobRefs[i]->unref();
	}
	delete[] fTextBlobRefs;

	for (int i = 0; i < fVerticesCount; i++) {
	fVerticesRefs[i]->unref();
	}
	delete[] fVerticesRefs;

	for (int i = 0; i < fImageCount; i++) {
	fImageRefs[i]->unref();
	}
	delete[] fImageRefs;

	delete fFactoryPlayback;
	}

	///////////////////////////////////////////////////////////////////////////////
	///////////////////////////////////////////////////////////////////////////////

	#include "SkStream.h"

	static size_t compute_chunk_size(SkFlattenable::Factory* array, int count) {
	size_t size = 4; // for 'count'

	for (int i = 0; i < count; i++) {
	const char* name = SkFlattenable::FactoryToName(array[i]);
	if (nullptr == name \|\| 0 == *name) {
	size += SkWStream::SizeOfPackedUInt(0);
	} else {
	size_t len = strlen(name);
	size += SkWStream::SizeOfPackedUInt(len);
	size += len;
	}
	}

	return size;
	}

	static void write_tag_size(SkWriteBuffer& buffer, uint32_t tag, size_t size) {
	buffer.writeUInt(tag);
	buffer.writeUInt(SkToU32(size));
	}

	static void write_tag_size(SkWStream* stream, uint32_t tag, size_t size) {
	stream->write32(tag);
	stream->write32(SkToU32(size));
	}

	void SkPictureData::WriteFactories(SkWStream* stream, const SkFactorySet& rec) {
	int count = rec.count();

	SkAutoSTMalloc<16, SkFlattenable::Factory> storage(count);
	SkFlattenable::Factory* array = (SkFlattenable::Factory*)storage.get();
	rec.copyToArray(array);

	size_t size = compute_chunk_size(array, count);

	// TODO: write_tag_size should really take a size_t
	write_tag_size(stream, SK_PICT_FACTORY_TAG, (uint32_t) size);
	SkDEBUGCODE(size_t start = stream->bytesWritten());
	stream->write32(count);

	for (int i = 0; i < count; i++) {
	const char* name = SkFlattenable::FactoryToName(array[i]);
	if (nullptr == name \|\| 0 == *name) {
	stream->writePackedUInt(0);
	} else {
	size_t len = strlen(name);
	stream->writePackedUInt(len);
	stream->write(name, len);
	}
	}

	SkASSERT(size == (stream->bytesWritten() - start));
	}

	void SkPictureData::WriteTypefaces(SkWStream* stream, const SkRefCntSet& rec) {
	int count = rec.count();

	write_tag_size(stream, SK_PICT_TYPEFACE_TAG, count);

	SkAutoSTMalloc<16, SkTypeface*> storage(count);
	SkTypeface array = (SkTypeface)storage.get();
	rec.copyToArray((SkRefCnt**)array);

	for (int i = 0; i < count; i++) {
	array[i]->serialize(stream);
	}
	}

	void SkPictureData::flattenToBuffer(SkWriteBuffer& buffer) const {
	int i, n;

	if ((n = fPaints.count()) > 0) {
	write_tag_size(buffer, SK_PICT_PAINT_BUFFER_TAG, n);
	for (i = 0; i < n; i++) {
	buffer.writePaint(fPaints[i]);
	}
	}

	if ((n = fPaths.count()) > 0) {
	write_tag_size(buffer, SK_PICT_PATH_BUFFER_TAG, n);
	buffer.writeInt(n);
	for (int i = 0; i < n; i++) {
	buffer.writePath(fPaths[i]);
	}
	}

	if (fTextBlobCount > 0) {
	write_tag_size(buffer, SK_PICT_TEXTBLOB_BUFFER_TAG, fTextBlobCount);
	for (i = 0; i < fTextBlobCount; ++i) {
	fTextBlobRefs[i]->flatten(buffer);
	}
	}

	if (fVerticesCount > 0) {
	write_tag_size(buffer, SK_PICT_VERTICES_BUFFER_TAG, fVerticesCount);
	for (i = 0; i < fVerticesCount; ++i) {
	buffer.writeDataAsByteArray(fVerticesRefs[i]->encode().get());
	}
	}

	if (fImageCount > 0) {
	write_tag_size(buffer, SK_PICT_IMAGE_BUFFER_TAG, fImageCount);
	for (i = 0; i < fImageCount; ++i) {
	buffer.writeImage(fImageRefs[i]);
	}
	}
	}

	void SkPictureData::serialize(SkWStream* stream, const SkSerialProcs& procs,
	SkRefCntSet* topLevelTypeFaceSet) const {
	// This can happen at pretty much any time, so might as well do it first.
	write_tag_size(stream, SK_PICT_READER_TAG, fOpData->size());
	stream->write(fOpData->bytes(), fOpData->size());

	// We serialize all typefaces into the typeface section of the top-level picture.
	SkRefCntSet localTypefaceSet;
	SkRefCntSet* typefaceSet = topLevelTypeFaceSet ? topLevelTypeFaceSet : &localTypefaceSet;

	// We delay serializing the bulk of our data until after we've serialized
	// factories and typefaces by first serializing to an in-memory write buffer.
	SkFactorySet factSet; // buffer refs factSet, so factSet must come first.
	SkBinaryWriteBuffer buffer;
	buffer.setFactoryRecorder(&factSet);
	buffer.setSerialProcs(procs);
	buffer.setTypefaceRecorder(typefaceSet);
	this->flattenToBuffer(buffer);

	// Dummy serialize our sub-pictures for the side effect of filling
	// typefaceSet with typefaces from sub-pictures.
	struct DevNull: public SkWStream {
	DevNull() : fBytesWritten(0) {}
	size_t fBytesWritten;
	bool write(const void*, size_t size) override { fBytesWritten += size; return true; }
	size_t bytesWritten() const override { return fBytesWritten; }
	} devnull;
	for (int i = 0; i < fPictureCount; i++) {
	fPictureRefs[i]->serialize(&devnull, nullptr, typefaceSet);
	}

	// We need to write factories before we write the buffer.
	// We need to write typefaces before we write the buffer or any sub-picture.
	WriteFactories(stream, factSet);
	if (typefaceSet == &localTypefaceSet) {
	WriteTypefaces(stream, *typefaceSet);
	}

	// Write the buffer.
	write_tag_size(stream, SK_PICT_BUFFER_SIZE_TAG, buffer.bytesWritten());
	buffer.writeToStream(stream);

	// Write sub-pictures by calling serialize again.
	if (fPictureCount > 0) {
	write_tag_size(stream, SK_PICT_PICTURE_TAG, fPictureCount);
	for (int i = 0; i < fPictureCount; i++) {
	fPictureRefs[i]->serialize(stream, &procs, typefaceSet);
	}
	}

	stream->write32(SK_PICT_EOF_TAG);
	}

	void SkPictureData::flatten(SkWriteBuffer& buffer) const {
	write_tag_size(buffer, SK_PICT_READER_TAG, fOpData->size());
	buffer.writeByteArray(fOpData->bytes(), fOpData->size());

	if (fPictureCount > 0) {
	write_tag_size(buffer, SK_PICT_PICTURE_TAG, fPictureCount);
	for (int i = 0; i < fPictureCount; i++) {
	fPictureRefs[i]->flatten(buffer);
	}
	}

	if (fDrawableCount > 0) {
	write_tag_size(buffer, SK_PICT_DRAWABLE_TAG, fDrawableCount);
	for (int i = 0; i < fDrawableCount; i++) {
	buffer.writeFlattenable(fDrawableRefs[i]);
	}
	}

	// Write this picture playback's data into a writebuffer
	this->flattenToBuffer(buffer);
	buffer.write32(SK_PICT_EOF_TAG);
	}

	///////////////////////////////////////////////////////////////////////////////

	bool SkPictureData::parseStreamTag(SkStream* stream,
	uint32_t tag,
	uint32_t size,
	const SkDeserialProcs& procs,
	SkTypefacePlayback* topLevelTFPlayback) {
	/*
	* By the time we encounter BUFFER_SIZE_TAG, we need to have already seen
	* its dependents: FACTORY_TAG and TYPEFACE_TAG. These two are not required
	* but if they are present, they need to have been seen before the buffer.
	*
	* We assert that if/when we see either of these, that we have not yet seen
	* the buffer tag, because if we have, then its too-late to deal with the
	* factories or typefaces.
	*/
	SkDEBUGCODE(bool haveBuffer = false;)

	switch (tag) {
	case SK_PICT_READER_TAG:
	SkASSERT(nullptr == fOpData);
	fOpData = SkData::MakeFromStream(stream, size);
	if (!fOpData) {
	return false;
	}
	break;
	case SK_PICT_FACTORY_TAG: {
	SkASSERT(!haveBuffer);
	size = stream->readU32();
	fFactoryPlayback = new SkFactoryPlayback(size);
	for (size_t i = 0; i < size; i++) {
	SkString str;
	const size_t len = stream->readPackedUInt();
	str.resize(len);
	if (stream->read(str.writable_str(), len) != len) {
	return false;
	}
	fFactoryPlayback->base()[i] = SkFlattenable::NameToFactory(str.c_str());
	}
	} break;
	case SK_PICT_TYPEFACE_TAG: {
	SkASSERT(!haveBuffer);
	const int count = SkToInt(size);
	fTFPlayback.setCount(count);
	for (int i = 0; i < count; i++) {
	sk_sp<SkTypeface> tf(SkTypeface::MakeDeserialize(stream));
	if (!tf.get()) { // failed to deserialize
	// fTFPlayback asserts it never has a null, so we plop in
	// the default here.
	tf = SkTypeface::MakeDefault();
	}
	fTFPlayback.set(i, tf.get());
	}
	} break;
	case SK_PICT_PICTURE_TAG: {
	fPictureCount = 0;
	fPictureRefs = new const SkPicture* [size];
	for (uint32_t i = 0; i < size; i++) {
	fPictureRefs[i] = SkPicture::MakeFromStream(stream, &procs, topLevelTFPlayback).release();
	if (!fPictureRefs[i]) {
	return false;
	}
	fPictureCount++;
	}
	} break;
	case SK_PICT_BUFFER_SIZE_TAG: {
	SkAutoMalloc storage(size);
	if (stream->read(storage.get(), size) != size) {
	return false;
	}

	SkReadBuffer buffer(storage.get(), size);
	buffer.setVersion(fInfo.getVersion());

	if (!fFactoryPlayback) {
	return false;
	}
	fFactoryPlayback->setupBuffer(buffer);
	buffer.setDeserialProcs(procs);

	if (fTFPlayback.count() > 0) {
	// .skp files <= v43 have typefaces serialized with each sub picture.
	fTFPlayback.setupBuffer(buffer);
	} else {
	// Newer .skp files serialize all typefaces with the top picture.
	topLevelTFPlayback->setupBuffer(buffer);
	}

	while (!buffer.eof() && buffer.isValid()) {
	tag = buffer.readUInt();
	size = buffer.readUInt();
	this->parseBufferTag(buffer, tag, size);
	}
	if (!buffer.isValid()) {
	return false;
	}
	SkDEBUGCODE(haveBuffer = true;)
	} break;
	}
	return true; // success
	}

	static sk_sp<SkImage> create_image_from_buffer(SkReadBuffer& buffer) {
	return buffer.readImage();
	}
	static sk_sp<SkVertices> create_vertices_from_buffer(SkReadBuffer& buffer) {
	auto data = buffer.readByteArrayAsData();
	return data ? SkVertices::Decode(data->data(), data->size()) : nullptr;
	}

	static sk_sp<SkDrawable> create_drawable_from_buffer(SkReadBuffer& buffer) {
	return sk_sp<SkDrawable>((SkDrawable*)buffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
	}

	template <typename T>
	bool new_array_from_buffer(SkReadBuffer& buffer, uint32_t inCount,
	const T*** array, int* outCount, sk_sp<T> (*factory)(SkReadBuffer&)) {
	if (!buffer.validate((0 == outCount) && (nullptr == array))) {
	return false;
	}
	if (0 == inCount) {
	return true;
	}
	if (!buffer.validate(SkTFitsIn<int>(inCount))) {
	return false;
	}

	*outCount = inCount;
	array = new const T [*outCount];
	bool success = true;
	int i = 0;
	for (; i < *outCount; i++) {
	(*array)[i] = factory(buffer).release();
	if (nullptr == (*array)[i]) {
	success = false;
	break;
	}
	}
	if (!success) {
	// Delete all of the blobs that were already created (up to but excluding i):
	for (int j = 0; j < i; j++) {
	(*array)[j]->unref();
	}
	// Delete the array
	delete[] * array;
	*array = nullptr;
	*outCount = 0;
	return buffer.validate(false);
	}
	return true;
	}

	void SkPictureData::parseBufferTag(SkReadBuffer& buffer, uint32_t tag, uint32_t size) {
	switch (tag) {
	case SK_PICT_PAINT_BUFFER_TAG: {
	if (!buffer.validate(SkTFitsIn<int>(size))) {
	return;
	}
	const int count = SkToInt(size);
	fPaints.reset(count);
	for (int i = 0; i < count; ++i) {
	if (!buffer.readPaint(&fPaints[i])) {
	return;
	}
	}
	} break;
	case SK_PICT_PATH_BUFFER_TAG:
	if (size > 0) {
	const int count = buffer.readInt();
	if (!buffer.validate(count >= 0)) {
	return;
	}
	fPaths.reset(count);
	for (int i = 0; i < count; i++) {
	buffer.readPath(&fPaths[i]);
	}
	} break;
	case SK_PICT_TEXTBLOB_BUFFER_TAG:
	new_array_from_buffer(buffer, size, &fTextBlobRefs, &fTextBlobCount,
	SkTextBlob::MakeFromBuffer);
	break;
	case SK_PICT_VERTICES_BUFFER_TAG:
	new_array_from_buffer(buffer, size, &fVerticesRefs, &fVerticesCount,
	create_vertices_from_buffer);
	break;
	case SK_PICT_IMAGE_BUFFER_TAG:
	new_array_from_buffer(buffer, size, &fImageRefs, &fImageCount,
	create_image_from_buffer);
	break;
	case SK_PICT_READER_TAG: {
	auto data(SkData::MakeUninitialized(size));
	if (!buffer.readByteArray(data->writable_data(), size) \|\|
	!buffer.validate(nullptr == fOpData)) {
	return;
	}
	SkASSERT(nullptr == fOpData);
	fOpData = std::move(data);
	} break;
	case SK_PICT_PICTURE_TAG:
	new_array_from_buffer(buffer, size, &fPictureRefs, &fPictureCount,
	SkPicture::MakeFromBuffer);
	break;
	case SK_PICT_DRAWABLE_TAG:
	new_array_from_buffer(buffer, size, (const SkDrawable***)&fDrawableRefs,
	&fDrawableCount, create_drawable_from_buffer);
	break;
	default:
	buffer.validate(false); // The tag was invalid.
	break;
	}
	}

	SkPictureData* SkPictureData::CreateFromStream(SkStream* stream,
	const SkPictInfo& info,
	const SkDeserialProcs& procs,
	SkTypefacePlayback* topLevelTFPlayback) {
	std::unique_ptr<SkPictureData> data(new SkPictureData(info));
	if (!topLevelTFPlayback) {
	topLevelTFPlayback = &data->fTFPlayback;
	}

	if (!data->parseStream(stream, procs, topLevelTFPlayback)) {
	return nullptr;
	}
	return data.release();
	}

	SkPictureData* SkPictureData::CreateFromBuffer(SkReadBuffer& buffer,
	const SkPictInfo& info) {
	std::unique_ptr<SkPictureData> data(new SkPictureData(info));
	buffer.setVersion(info.getVersion());

	if (!data->parseBuffer(buffer)) {
	return nullptr;
	}
	return data.release();
	}

	bool SkPictureData::parseStream(SkStream* stream,
	const SkDeserialProcs& procs,
	SkTypefacePlayback* topLevelTFPlayback) {
	for (;;) {
	uint32_t tag = stream->readU32();
	if (SK_PICT_EOF_TAG == tag) {
	break;
	}

	uint32_t size = stream->readU32();
	if (!this->parseStreamTag(stream, tag, size, procs, topLevelTFPlayback)) {
	return false; // we're invalid
	}
	}
	return true;
	}

	bool SkPictureData::parseBuffer(SkReadBuffer& buffer) {
	while (buffer.isValid()) {
	uint32_t tag = buffer.readUInt();
	if (SK_PICT_EOF_TAG == tag) {
	break;
	}
	this->parseBufferTag(buffer, tag, buffer.readUInt());
	}

	// Check that we encountered required tags
	if (!buffer.validate(this->opData())) {
	// If we didn't build any opData, we are invalid. Even an EmptyPicture allocates the
	// SkData for the ops (though its length may be zero).
	return false;
	}
	return true;
	}