The Tor Browser: comparison gfx/skia/trunk/src/core/SkWriteBuffer.cpp

--1:000000000000
+:69892b8c134b
+/*
+* 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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comparison: gfx/skia/trunk/src/core/SkWriteBuffer.cpp

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