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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkMultiPictureDocumentPriv.h"
#include "SkMultiPictureDocumentReader.h"
#include "SkPicture.h"
#include "SkStream.h"
bool SkMultiPictureDocumentReader::init(SkStreamSeekable* stream) {
if (!stream) {
return false;
}
stream->seek(0);
const size_t size = sizeof(SkMultiPictureDocumentProtocol::kMagic) - 1;
char buffer[size];
if (size != stream->read(buffer, size) ||
0 != memcmp(SkMultiPictureDocumentProtocol::kMagic, buffer, size)) {
stream = nullptr;
return false;
}
bool good = true;
uint32_t versionNumber = stream->readU32();
if (versionNumber != 1) {
return false;
}
uint32_t pageCount = stream->readU32();
fSizes.reset(pageCount);
fOffsets.reset(pageCount);
for (uint32_t i = 0; i < pageCount; ++i) {
SkMultiPictureDocumentProtocol::Entry entry;
good &= sizeof(entry) == stream->read(&entry, sizeof(entry));
fSizes[i] = SkSize::Make(entry.sizeX, entry.sizeY);
good &= SkTFitsIn<size_t>(entry.offset);
fOffsets[i] = static_cast<size_t>(entry.offset);
}
return good;
}
sk_sp<SkPicture> SkMultiPictureDocumentReader::readPage(SkStreamSeekable* stream,
int pageNumber) const {
SkASSERT(pageNumber >= 0);
SkASSERT(pageNumber < fOffsets.count());
SkAssertResult(stream->seek(fOffsets[pageNumber]));
return SkPicture::MakeFromStream(stream);
}
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