| /* |
| * 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 "src/utils/SkMultiPictureDocument.h" |
| |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkData.h" |
| #include "include/core/SkDocument.h" |
| #include "include/core/SkPicture.h" |
| #include "include/core/SkPictureRecorder.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkSerialProcs.h" |
| #include "include/core/SkStream.h" |
| #include "include/private/SkTArray.h" |
| #include "include/private/SkTo.h" |
| #include "include/utils/SkNWayCanvas.h" |
| #include "src/utils/SkMultiPictureDocumentPriv.h" |
| |
| #include <limits.h> |
| #include <string.h> |
| #include <algorithm> |
| #include <functional> |
| |
| /* |
| File format: |
| BEGINNING_OF_FILE: |
| kMagic |
| uint32_t version_number (==2) |
| uint32_t page_count |
| { |
| float sizeX |
| float sizeY |
| } * page_count |
| skp file |
| */ |
| |
| namespace { |
| // The unique file signature for this file type. |
| static constexpr char kMagic[] = "Skia Multi-Picture Doc\n\n"; |
| |
| static constexpr char kEndPage[] = "SkMultiPictureEndPage"; |
| |
| const uint32_t kVersion = 2; |
| |
| static SkSize join(const SkTArray<SkSize>& sizes) { |
| SkSize joined = {0, 0}; |
| for (SkSize s : sizes) { |
| joined = SkSize{std::max(joined.width(), s.width()), std::max(joined.height(), s.height())}; |
| } |
| return joined; |
| } |
| |
| struct MultiPictureDocument final : public SkDocument { |
| const SkSerialProcs fProcs; |
| SkPictureRecorder fPictureRecorder; |
| SkSize fCurrentPageSize; |
| SkTArray<sk_sp<SkPicture>> fPages; |
| SkTArray<SkSize> fSizes; |
| std::function<void(const SkPicture*)> fOnEndPage; |
| MultiPictureDocument(SkWStream* s, const SkSerialProcs* procs, |
| std::function<void(const SkPicture*)> onEndPage) |
| : SkDocument(s) |
| , fProcs(procs ? *procs : SkSerialProcs()) |
| , fOnEndPage(onEndPage) |
| {} |
| ~MultiPictureDocument() override { this->close(); } |
| |
| SkCanvas* onBeginPage(SkScalar w, SkScalar h) override { |
| fCurrentPageSize.set(w, h); |
| return fPictureRecorder.beginRecording(w, h); |
| } |
| void onEndPage() override { |
| fSizes.push_back(fCurrentPageSize); |
| sk_sp<SkPicture> lastPage = fPictureRecorder.finishRecordingAsPicture(); |
| fPages.push_back(lastPage); |
| if (fOnEndPage) { |
| fOnEndPage(lastPage.get()); |
| } |
| } |
| void onClose(SkWStream* wStream) override { |
| SkASSERT(wStream); |
| SkASSERT(wStream->bytesWritten() == 0); |
| wStream->writeText(kMagic); |
| wStream->write32(kVersion); |
| wStream->write32(SkToU32(fPages.count())); |
| for (SkSize s : fSizes) { |
| wStream->write(&s, sizeof(s)); |
| } |
| SkSize bigsize = join(fSizes); |
| SkCanvas* c = fPictureRecorder.beginRecording(SkRect::MakeSize(bigsize)); |
| for (const sk_sp<SkPicture>& page : fPages) { |
| c->drawPicture(page); |
| // Annotations must include some data. |
| c->drawAnnotation(SkRect::MakeEmpty(), kEndPage, SkData::MakeWithCString("X")); |
| } |
| sk_sp<SkPicture> p = fPictureRecorder.finishRecordingAsPicture(); |
| p->serialize(wStream, &fProcs); |
| fPages.reset(); |
| fSizes.reset(); |
| return; |
| } |
| void onAbort() override { |
| fPages.reset(); |
| fSizes.reset(); |
| } |
| }; |
| } // namespace |
| |
| sk_sp<SkDocument> SkMakeMultiPictureDocument(SkWStream* wStream, const SkSerialProcs* procs, |
| std::function<void(const SkPicture*)> onEndPage) { |
| return sk_make_sp<MultiPictureDocument>(wStream, procs, onEndPage); |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| int SkMultiPictureDocumentReadPageCount(SkStreamSeekable* stream) { |
| if (!stream) { |
| return 0; |
| } |
| stream->seek(0); |
| const size_t size = sizeof(kMagic) - 1; |
| char buffer[size]; |
| if (size != stream->read(buffer, size) || 0 != memcmp(kMagic, buffer, size)) { |
| stream = nullptr; |
| return 0; |
| } |
| uint32_t versionNumber; |
| if (!stream->readU32(&versionNumber) || versionNumber != kVersion) { |
| return 0; |
| } |
| uint32_t pageCount; |
| if (!stream->readU32(&pageCount) || pageCount > INT_MAX) { |
| return 0; |
| } |
| // leave stream position right here. |
| return SkTo<int>(pageCount); |
| } |
| |
| bool SkMultiPictureDocumentReadPageSizes(SkStreamSeekable* stream, |
| SkDocumentPage* dstArray, |
| int dstArrayCount) { |
| if (!dstArray || dstArrayCount < 1) { |
| return false; |
| } |
| int pageCount = SkMultiPictureDocumentReadPageCount(stream); |
| if (pageCount < 1 || pageCount != dstArrayCount) { |
| return false; |
| } |
| for (int i = 0; i < pageCount; ++i) { |
| SkSize& s = dstArray[i].fSize; |
| if (sizeof(s) != stream->read(&s, sizeof(s))) { |
| return false; |
| } |
| } |
| // leave stream position right here. |
| return true; |
| } |
| |
| namespace { |
| struct PagerCanvas : public SkNWayCanvas { |
| SkPictureRecorder fRecorder; |
| SkDocumentPage* fDst; |
| int fCount; |
| int fIndex = 0; |
| PagerCanvas(SkISize wh, SkDocumentPage* dst, int count) |
| : SkNWayCanvas(wh.width(), wh.height()), fDst(dst), fCount(count) { |
| this->nextCanvas(); |
| } |
| void nextCanvas() { |
| if (fIndex < fCount) { |
| SkRect bounds = SkRect::MakeSize(fDst[fIndex].fSize); |
| this->addCanvas(fRecorder.beginRecording(bounds)); |
| } |
| } |
| void onDrawAnnotation(const SkRect& r, const char* key, SkData* d) override { |
| if (0 == strcmp(key, kEndPage)) { |
| this->removeAll(); |
| if (fIndex < fCount) { |
| fDst[fIndex].fPicture = fRecorder.finishRecordingAsPicture(); |
| ++fIndex; |
| } |
| this->nextCanvas(); |
| } else { |
| this->SkNWayCanvas::onDrawAnnotation(r, key, d); |
| } |
| } |
| }; |
| } // namespace |
| |
| bool SkMultiPictureDocumentRead(SkStreamSeekable* stream, |
| SkDocumentPage* dstArray, |
| int dstArrayCount, |
| const SkDeserialProcs* procs) { |
| if (!SkMultiPictureDocumentReadPageSizes(stream, dstArray, dstArrayCount)) { |
| return false; |
| } |
| SkSize joined = {0.0f, 0.0f}; |
| for (int i = 0; i < dstArrayCount; ++i) { |
| joined = SkSize{std::max(joined.width(), dstArray[i].fSize.width()), |
| std::max(joined.height(), dstArray[i].fSize.height())}; |
| } |
| |
| auto picture = SkPicture::MakeFromStream(stream, procs); |
| if (!picture) { |
| return false; |
| } |
| |
| PagerCanvas canvas(joined.toCeil(), dstArray, dstArrayCount); |
| // Must call playback(), not drawPicture() to reach |
| // PagerCanvas::onDrawAnnotation(). |
| picture->playback(&canvas); |
| if (canvas.fIndex != dstArrayCount) { |
| SkDEBUGF("Malformed SkMultiPictureDocument: canvas.fIndex=%d dstArrayCount=%d\n", |
| canvas.fIndex, dstArrayCount); |
| } |
| return true; |
| } |