The Tor Browser: gfx/skia/trunk/src/core/SkWriteBuffer.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkWriteBuffer.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkWriteBuffer.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * 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 "SkData.h"
 #include "SkPixelRef.h"
 #include "SkPtrRecorder.h"
 #include "SkStream.h"
 #include "SkTypeface.h"
 SkWriteBuffer::SkWriteBuffer(uint32_t flags)
     : fFlags(flags)
     , fFactorySet(NULL)
     , fNamedFactorySet(NULL)
     , fBitmapHeap(NULL)
     , fTFSet(NULL)
     , fBitmapEncoder(NULL) {
 }
 SkWriteBuffer::SkWriteBuffer(void* storage, size_t storageSize, uint32_t flags)
     : fFlags(flags)
     , fFactorySet(NULL)
     , fNamedFactorySet(NULL)
     , fWriter(storage, storageSize)
     , fBitmapHeap(NULL)
     , fTFSet(NULL)
     , fBitmapEncoder(NULL) {
 }
 SkWriteBuffer::~SkWriteBuffer() {
     SkSafeUnref(fFactorySet);
     SkSafeUnref(fNamedFactorySet);
     SkSafeUnref(fBitmapHeap);
     SkSafeUnref(fTFSet);
 }
 void SkWriteBuffer::writeByteArray(const void* data, size_t size) {
     fWriter.write32(SkToU32(size));
     fWriter.writePad(data, size);
 }
 void SkWriteBuffer::writeBool(bool value) {
     fWriter.writeBool(value);
 }
 void SkWriteBuffer::writeFixed(SkFixed value) {
     fWriter.write32(value);
 }
 void SkWriteBuffer::writeScalar(SkScalar value) {
     fWriter.writeScalar(value);
 }
 void SkWriteBuffer::writeScalarArray(const SkScalar* value, uint32_t count) {
     fWriter.write32(count);
     fWriter.write(value, count * sizeof(SkScalar));
 }
 void SkWriteBuffer::writeInt(int32_t value) {
     fWriter.write32(value);
 }
 void SkWriteBuffer::writeIntArray(const int32_t* value, uint32_t count) {
     fWriter.write32(count);
     fWriter.write(value, count * sizeof(int32_t));
 }
 void SkWriteBuffer::writeUInt(uint32_t value) {
     fWriter.write32(value);
 }
 void SkWriteBuffer::write32(int32_t value) {
     fWriter.write32(value);
 }
 void SkWriteBuffer::writeString(const char* value) {
     fWriter.writeString(value);
 }
 void SkWriteBuffer::writeEncodedString(const void* value, size_t byteLength,
                                               SkPaint::TextEncoding encoding) {
     fWriter.writeInt(encoding);
     fWriter.writeInt(SkToU32(byteLength));
     fWriter.write(value, byteLength);
 }
 void SkWriteBuffer::writeColor(const SkColor& color) {
     fWriter.write32(color);
 }
 void SkWriteBuffer::writeColorArray(const SkColor* color, uint32_t count) {
     fWriter.write32(count);
     fWriter.write(color, count * sizeof(SkColor));
 }
 void SkWriteBuffer::writePoint(const SkPoint& point) {
     fWriter.writeScalar(point.fX);
     fWriter.writeScalar(point.fY);
 }
 void SkWriteBuffer::writePointArray(const SkPoint* point, uint32_t count) {
     fWriter.write32(count);
     fWriter.write(point, count * sizeof(SkPoint));
 }
 void SkWriteBuffer::writeMatrix(const SkMatrix& matrix) {
     fWriter.writeMatrix(matrix);
 }
 void SkWriteBuffer::writeIRect(const SkIRect& rect) {
     fWriter.write(&rect, sizeof(SkIRect));
 }
 void SkWriteBuffer::writeRect(const SkRect& rect) {
     fWriter.writeRect(rect);
 }
 void SkWriteBuffer::writeRegion(const SkRegion& region) {
     fWriter.writeRegion(region);
 }
 void SkWriteBuffer::writePath(const SkPath& path) {
     fWriter.writePath(path);
 }
 size_t SkWriteBuffer::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) {
     return fWriter.writeToStream(stream);
 }
 static void write_encoded_bitmap(SkWriteBuffer* 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) {
     // 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
     //    bitmap. After writing a boolean value of false, signifying that a heap was not used, write
     //    the size of the encoded data. A non-zero size signifies that encoded data was written.
     // 3. Call SkBitmap::flatten. After writing a boolean value of false, signifying that a heap was
     //    not used, write a zero to signify that the data was not encoded.
     bool useBitmapHeap = fBitmapHeap != NULL;
     // Write a bool: true if the SkBitmapHeap is to be used, in which case the reader must use an
     // SkBitmapHeapReader to read the SkBitmap. False if the bitmap was serialized another way.
     this->writeBool(useBitmapHeap);
     if (useBitmapHeap) {
         SkASSERT(NULL == fBitmapEncoder);
         int32_t slot = fBitmapHeap->insert(bitmap);
         fWriter.write32(slot);
         // crbug.com/155875
         // The generation ID is not required information. We write it to prevent collisions
         // in SkFlatDictionary.  It is possible to get a collision when a previously
         // 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;
     }
     // see if the pixelref already has an encoded version
     if (bitmap.pixelRef()) {
         SkAutoDataUnref data(bitmap.pixelRef()->refEncodedData());
         if (data.get() != NULL) {
             write_encoded_bitmap(this, data, bitmap.pixelRefOrigin());
             return;
         }
     }
     // see if the caller wants to manually encode
     if (fBitmapEncoder != NULL) {
         SkASSERT(NULL == fBitmapHeap);
         size_t offset = 0;  // this parameter is deprecated/ignored
         // if we have to "encode" the bitmap, then we assume there is no
         // offset to share, since we are effectively creating a new pixelref
         SkAutoDataUnref data(fBitmapEncoder(&offset, bitmap));
         if (data.get() != NULL) {
             write_encoded_bitmap(this, data, SkIPoint::Make(0, 0));
             return;
         }
     }
     // Bitmap was not encoded. Record a zero, implying that the reader need not decode.
     this->writeUInt(0);
     bitmap.flatten(*this);
 }
 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);
     if (fNamedFactorySet != NULL) {
         fNamedFactorySet->unref();
         fNamedFactorySet = NULL;
     }
     return rec;
 }
 SkNamedFactorySet* SkWriteBuffer::setNamedFactoryRecorder(SkNamedFactorySet* rec) {
     SkRefCnt_SafeAssign(fNamedFactorySet, rec);
     if (fFactorySet != NULL) {
         fFactorySet->unref();
         fFactorySet = NULL;
     }
     return rec;
 }
 SkRefCntSet* SkWriteBuffer::setTypefaceRecorder(SkRefCntSet* rec) {
     SkRefCnt_SafeAssign(fTFSet, rec);
     return rec;
 }
 void SkWriteBuffer::setBitmapHeap(SkBitmapHeap* bitmapHeap) {
     SkRefCnt_SafeAssign(fBitmapHeap, bitmapHeap);
     if (bitmapHeap != NULL) {
         SkASSERT(NULL == fBitmapEncoder);
         fBitmapEncoder = NULL;
     }
 }
 void SkWriteBuffer::setBitmapEncoder(SkPicture::EncodeBitmap bitmapEncoder) {
     fBitmapEncoder = bitmapEncoder;
     if (bitmapEncoder != NULL) {
         SkASSERT(NULL == fBitmapHeap);
         SkSafeUnref(fBitmapHeap);
         fBitmapHeap = NULL;
     }
 }
 void SkWriteBuffer::writeFlattenable(const SkFlattenable* flattenable) {
     /*
      *  If we have a factoryset, then the first 32bits tell us...
      *       0: failure to write the flattenable
      *      >0: (1-based) index into the SkFactorySet or SkNamedFactorySet
      *  If we don't have a factoryset, then the first "ptr" is either the
      *  factory, or null for failure.
      *
      *  The distinction is important, since 0-index is 32bits (always), but a
      *  0-functionptr might be 32 or 64 bits.
      */
     if (NULL == flattenable) {
         if (this->isValidating()) {
             this->writeString("");
         } else if (fFactorySet != NULL || fNamedFactorySet != NULL) {
             this->write32(0);
         } else {
             this->writeFunctionPtr(NULL);
         }
         return;
     }
     SkFlattenable::Factory factory = flattenable->getFactory();
     SkASSERT(factory != NULL);
     /*
      *  We can write 1 of 3 versions of the flattenable:
      *  1.  function-ptr : this is the fastest for the reader, but assumes that
      *      the writer and reader are in the same process.
      *  2.  index into fFactorySet : This is assumes the writer will later
      *      resolve the function-ptrs into strings for its reader. SkPicture
      *      does exactly this, by writing a table of names (matching the indices)
      *      up front in its serialized form.
      *  3.  index into fNamedFactorySet. fNamedFactorySet will also store the
      *      name. SkGPipe uses this technique so it can write the name to its
      *      stream before writing the flattenable.
      */
     if (this->isValidating()) {
         this->writeString(flattenable->getTypeName());
     } else if (fFactorySet) {
         this->write32(fFactorySet->add(factory));
     } else if (fNamedFactorySet) {
         int32_t index = fNamedFactorySet->find(factory);
         this->write32(index);
         if (0 == index) {
             return;
         }
     } else {
         this->writeFunctionPtr((void*)factory);
     }
     // 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));
 }

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gfx/skia/trunk/src/core/SkWriteBuffer.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/core/SkWriteBuffer.cpp