3 * Copyright 2012 Google Inc.
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
9 #include "SkOrderedWriteBuffer.h"
12 #include "SkPtrRecorder.h"
14 #include "SkTypeface.h"
16 SkOrderedWriteBuffer::SkOrderedWriteBuffer(size_t minSize)
19 , fNamedFactorySet(NULL)
23 , fBitmapEncoder(NULL) {
26 SkOrderedWriteBuffer::SkOrderedWriteBuffer(size_t minSize, void* storage, size_t storageSize)
29 , fNamedFactorySet(NULL)
30 , fWriter(minSize, storage, storageSize)
33 , fBitmapEncoder(NULL) {
36 SkOrderedWriteBuffer::~SkOrderedWriteBuffer() {
37 SkSafeUnref(fFactorySet);
38 SkSafeUnref(fNamedFactorySet);
39 SkSafeUnref(fBitmapHeap);
43 void SkOrderedWriteBuffer::writeByteArray(const void* data, size_t size) {
44 fWriter.write32(size);
45 fWriter.writePad(data, size);
48 void SkOrderedWriteBuffer::writeBool(bool value) {
49 fWriter.writeBool(value);
52 void SkOrderedWriteBuffer::writeFixed(SkFixed value) {
53 fWriter.write32(value);
56 void SkOrderedWriteBuffer::writeScalar(SkScalar value) {
57 fWriter.writeScalar(value);
60 void SkOrderedWriteBuffer::writeScalarArray(const SkScalar* value, uint32_t count) {
61 fWriter.write32(count);
62 fWriter.write(value, count * sizeof(SkScalar));
65 void SkOrderedWriteBuffer::writeInt(int32_t value) {
66 fWriter.write32(value);
69 void SkOrderedWriteBuffer::writeIntArray(const int32_t* value, uint32_t count) {
70 fWriter.write32(count);
71 fWriter.write(value, count * sizeof(int32_t));
74 void SkOrderedWriteBuffer::writeUInt(uint32_t value) {
75 fWriter.write32(value);
78 void SkOrderedWriteBuffer::write32(int32_t value) {
79 fWriter.write32(value);
82 void SkOrderedWriteBuffer::writeString(const char* value) {
83 fWriter.writeString(value);
86 void SkOrderedWriteBuffer::writeEncodedString(const void* value, size_t byteLength,
87 SkPaint::TextEncoding encoding) {
88 fWriter.writeInt(encoding);
89 fWriter.writeInt(byteLength);
90 fWriter.write(value, byteLength);
94 void SkOrderedWriteBuffer::writeColor(const SkColor& color) {
95 fWriter.write32(color);
98 void SkOrderedWriteBuffer::writeColorArray(const SkColor* color, uint32_t count) {
99 fWriter.write32(count);
100 fWriter.write(color, count * sizeof(SkColor));
103 void SkOrderedWriteBuffer::writePoint(const SkPoint& point) {
104 fWriter.writeScalar(point.fX);
105 fWriter.writeScalar(point.fY);
108 void SkOrderedWriteBuffer::writePointArray(const SkPoint* point, uint32_t count) {
109 fWriter.write32(count);
110 fWriter.write(point, count * sizeof(SkPoint));
113 void SkOrderedWriteBuffer::writeMatrix(const SkMatrix& matrix) {
114 fWriter.writeMatrix(matrix);
117 void SkOrderedWriteBuffer::writeIRect(const SkIRect& rect) {
118 fWriter.write(&rect, sizeof(SkIRect));
121 void SkOrderedWriteBuffer::writeRect(const SkRect& rect) {
122 fWriter.writeRect(rect);
125 void SkOrderedWriteBuffer::writeRegion(const SkRegion& region) {
126 fWriter.writeRegion(region);
129 void SkOrderedWriteBuffer::writePath(const SkPath& path) {
130 fWriter.writePath(path);
133 size_t SkOrderedWriteBuffer::writeStream(SkStream* stream, size_t length) {
134 fWriter.write32(length);
135 size_t bytesWritten = fWriter.readFromStream(stream, length);
136 if (bytesWritten < length) {
137 fWriter.reservePad(length - bytesWritten);
142 bool SkOrderedWriteBuffer::writeToStream(SkWStream* stream) {
143 return fWriter.writeToStream(stream);
146 // Defined in SkBitmap.cpp
147 bool get_upper_left_from_offset(SkBitmap::Config config, size_t offset, size_t rowBytes,
148 int32_t* x, int32_t* y);
150 void SkOrderedWriteBuffer::writeBitmap(const SkBitmap& bitmap) {
151 // Record the width and height. This way if readBitmap fails a dummy bitmap can be drawn at the
153 this->writeInt(bitmap.width());
154 this->writeInt(bitmap.height());
156 // Record information about the bitmap in one of three ways, in order of priority:
157 // 1. If there is an SkBitmapHeap, store it in the heap. The client can avoid serializing the
158 // bitmap entirely or serialize it later as desired. A boolean value of true will be written
159 // to the stream to signify that a heap was used.
160 // 2. If there is a function for encoding bitmaps, use it to write an encoded version of the
161 // bitmap. After writing a boolean value of false, signifying that a heap was not used, write
162 // the size of the encoded data. A non-zero size signifies that encoded data was written.
163 // 3. Call SkBitmap::flatten. After writing a boolean value of false, signifying that a heap was
164 // not used, write a zero to signify that the data was not encoded.
165 bool useBitmapHeap = fBitmapHeap != NULL;
166 // Write a bool: true if the SkBitmapHeap is to be used, in which case the reader must use an
167 // SkBitmapHeapReader to read the SkBitmap. False if the bitmap was serialized another way.
168 this->writeBool(useBitmapHeap);
170 SkASSERT(NULL == fBitmapEncoder);
171 int32_t slot = fBitmapHeap->insert(bitmap);
172 fWriter.write32(slot);
174 // The generation ID is not required information. We write it to prevent collisions
175 // in SkFlatDictionary. It is possible to get a collision when a previously
176 // unflattened (i.e. stale) instance of a similar flattenable is in the dictionary
177 // and the instance currently being written is re-using the same slot from the
179 fWriter.write32(bitmap.getGenerationID());
182 if (fBitmapEncoder != NULL) {
183 SkASSERT(NULL == fBitmapHeap);
185 SkAutoDataUnref data(fBitmapEncoder(&offset, bitmap));
186 if (data.get() != NULL) {
187 // Write the length to indicate that the bitmap was encoded successfully, followed
188 // by the actual data.
189 this->writeUInt(SkToU32(data->size()));
190 fWriter.writePad(data->data(), data->size());
191 // Store the coordinate of the offset, rather than fPixelRefOffset, which may be
192 // different depending on the decoder.
194 if (0 == offset || !get_upper_left_from_offset(bitmap.config(), offset,
195 bitmap.rowBytes(), &x, &y)) {
203 // Bitmap was not encoded. Record a zero, implying that the reader need not decode.
205 bitmap.flatten(*this);
208 void SkOrderedWriteBuffer::writeTypeface(SkTypeface* obj) {
209 if (NULL == obj || NULL == fTFSet) {
212 fWriter.write32(fTFSet->add(obj));
216 SkFactorySet* SkOrderedWriteBuffer::setFactoryRecorder(SkFactorySet* rec) {
217 SkRefCnt_SafeAssign(fFactorySet, rec);
218 if (fNamedFactorySet != NULL) {
219 fNamedFactorySet->unref();
220 fNamedFactorySet = NULL;
225 SkNamedFactorySet* SkOrderedWriteBuffer::setNamedFactoryRecorder(SkNamedFactorySet* rec) {
226 SkRefCnt_SafeAssign(fNamedFactorySet, rec);
227 if (fFactorySet != NULL) {
228 fFactorySet->unref();
234 SkRefCntSet* SkOrderedWriteBuffer::setTypefaceRecorder(SkRefCntSet* rec) {
235 SkRefCnt_SafeAssign(fTFSet, rec);
239 void SkOrderedWriteBuffer::setBitmapHeap(SkBitmapHeap* bitmapHeap) {
240 SkRefCnt_SafeAssign(fBitmapHeap, bitmapHeap);
241 if (bitmapHeap != NULL) {
242 SkASSERT(NULL == fBitmapEncoder);
243 fBitmapEncoder = NULL;
247 void SkOrderedWriteBuffer::setBitmapEncoder(SkPicture::EncodeBitmap bitmapEncoder) {
248 fBitmapEncoder = bitmapEncoder;
249 if (bitmapEncoder != NULL) {
250 SkASSERT(NULL == fBitmapHeap);
251 SkSafeUnref(fBitmapHeap);
256 void SkOrderedWriteBuffer::writeFlattenable(const SkFlattenable* flattenable) {
258 * If we have a factoryset, then the first 32bits tell us...
259 * 0: failure to write the flattenable
260 * >0: (1-based) index into the SkFactorySet or SkNamedFactorySet
261 * If we don't have a factoryset, then the first "ptr" is either the
262 * factory, or null for failure.
264 * The distinction is important, since 0-index is 32bits (always), but a
265 * 0-functionptr might be 32 or 64 bits.
268 SkFlattenable::Factory factory = NULL;
270 factory = flattenable->getFactory();
272 if (NULL == factory) {
273 if (this->isValidating()) {
274 this->writeString("");
275 SkASSERT(NULL == flattenable); // We shouldn't get in here in this scenario
276 } else if (fFactorySet != NULL || fNamedFactorySet != NULL) {
279 this->writeFunctionPtr(NULL);
285 * We can write 1 of 3 versions of the flattenable:
286 * 1. function-ptr : this is the fastest for the reader, but assumes that
287 * the writer and reader are in the same process.
288 * 2. index into fFactorySet : This is assumes the writer will later
289 * resolve the function-ptrs into strings for its reader. SkPicture
290 * does exactly this, by writing a table of names (matching the indices)
291 * up front in its serialized form.
292 * 3. index into fNamedFactorySet. fNamedFactorySet will also store the
293 * name. SkGPipe uses this technique so it can write the name to its
294 * stream before writing the flattenable.
296 if (this->isValidating()) {
297 this->writeString(flattenable->getTypeName());
298 } else if (fFactorySet) {
299 this->write32(fFactorySet->add(factory));
300 } else if (fNamedFactorySet) {
301 int32_t index = fNamedFactorySet->find(factory);
302 this->write32(index);
307 this->writeFunctionPtr((void*)factory);
310 // make room for the size of the flattened object
311 (void)fWriter.reserve(sizeof(uint32_t));
312 // record the current size, so we can subtract after the object writes.
313 uint32_t offset = fWriter.bytesWritten();
314 // now flatten the object
315 flattenObject(flattenable, *this);
316 uint32_t objSize = fWriter.bytesWritten() - offset;
317 // record the obj's size
318 *fWriter.peek32(offset - sizeof(uint32_t)) = objSize;