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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"
#include "SkPictureRecorder.h"
#include "SkNWayCanvas.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 != SkMultiPictureDocumentProtocol::kVersion) {
return false;
}
uint32_t pageCount = stream->readU32();
fSizes.reset(pageCount);
for (uint32_t i = 0; i < pageCount; ++i) {
SkSize size;
good &= sizeof(size) == stream->read(&size, sizeof(size));
fSizes[i] = size;
}
fOffset = stream->getPosition();
return good;
}
namespace {
struct PagerCanvas : public SkNWayCanvas {
SkPictureRecorder fRecorder;
const SkTArray<SkSize>* fSizes;
SkTArray<sk_sp<SkPicture>>* fDest;
PagerCanvas(SkISize wh,
const SkTArray<SkSize>* s,
SkTArray<sk_sp<SkPicture>>* d)
: SkNWayCanvas(wh.width(), wh.height()), fSizes(s), fDest(d) {
this->nextCanvas();
}
void nextCanvas() {
int i = fDest->count();
if (i < fSizes->count()) {
SkRect bounds = SkRect::MakeSize((*fSizes)[i]);
this->addCanvas(fRecorder.beginRecording(bounds));
}
}
void onDrawAnnotation(const SkRect& r, const char* key, SkData* d) override {
if (0 == strcmp(key, SkMultiPictureDocumentProtocol::kEndPage)) {
this->removeAll();
if (fRecorder.getRecordingCanvas()) {
fDest->emplace_back(fRecorder.finishRecordingAsPicture());
}
this->nextCanvas();
} else {
this->SkNWayCanvas::onDrawAnnotation(r, key, d);
}
}
};
} // namespace
sk_sp<SkPicture> SkMultiPictureDocumentReader::readPage(SkStreamSeekable* stream,
int pageNumber) const {
SkASSERT(pageNumber >= 0);
SkASSERT(pageNumber < fSizes.count());
if (0 == fPages.count()) {
stream->seek(fOffset); // jump to beginning of skp
auto picture = SkPicture::MakeFromStream(stream);
SkISize size = SkMultiPictureDocumentProtocol::Join(fSizes).toCeil();
PagerCanvas canvas(size, &fSizes, &this->fPages);
// Must call playback(), not drawPicture() to reach
// PagerCanvas::onDrawAnnotation().
picture->playback(&canvas);
if (fPages.count() != fSizes.count()) {
SkDEBUGF(("Malformed SkMultiPictureDocument\n"));
}
}
// Allow for malformed document.
return pageNumber < fPages.count() ? fPages[pageNumber] : nullptr;
}
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