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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "components/printing/service/pdf_compositor_impl.h" |
| 6 |
| 7 #include <utility> |
| 8 #include <vector> |
| 9 |
| 10 #include "base/logging.h" |
| 11 #include "base/memory/shared_memory.h" |
| 12 #include "base/memory/shared_memory_handle.h" |
| 13 #include "base/time/time.h" |
| 14 #include "mojo/public/cpp/system/platform_handle.h" |
| 15 #include "printing/common/pdf_metafile_utils.h" |
| 16 #include "third_party/skia/include/core/SkCanvas.h" |
| 17 #include "third_party/skia/include/core/SkDocument.h" |
| 18 #include "third_party/skia/include/core/SkSize.h" |
| 19 #include "third_party/skia/include/core/SkStream.h" |
| 20 #include "third_party/skia/include/core/SkTypes.h" |
| 21 #include "third_party/skia/src/utils/SkMultiPictureDocument.h" |
| 22 |
| 23 namespace printing { |
| 24 |
| 25 PdfCompositorImpl::PdfCompositorImpl( |
| 26 const std::string& creator, |
| 27 std::unique_ptr<service_manager::ServiceContextRef> service_ref) |
| 28 : service_ref_(std::move(service_ref)), creator_(creator) {} |
| 29 |
| 30 PdfCompositorImpl::~PdfCompositorImpl() = default; |
| 31 |
| 32 void PdfCompositorImpl::CompositePdf( |
| 33 mojo::ScopedSharedBufferHandle sk_handle, |
| 34 const mojom::PdfCompositor::CompositePdfCallback& callback) { |
| 35 DCHECK(sk_handle.is_valid()); |
| 36 |
| 37 base::SharedMemoryHandle memory_handle; |
| 38 size_t memory_size = 0; |
| 39 bool read_only_flag = false; |
| 40 |
| 41 const MojoResult result = mojo::UnwrapSharedMemoryHandle( |
| 42 std::move(sk_handle), &memory_handle, &memory_size, &read_only_flag); |
| 43 DCHECK_EQ(MOJO_RESULT_OK, result); |
| 44 DCHECK_GT(memory_size, 0u); |
| 45 |
| 46 std::unique_ptr<base::SharedMemory> shm = |
| 47 base::MakeUnique<base::SharedMemory>(memory_handle, true); |
| 48 if (!shm->Map(memory_size) || shm->mapped_size() == 0) { |
| 49 DLOG(ERROR) << "CompositePdf: Shared memory map failed."; |
| 50 callback.Run(mojo::ScopedSharedBufferHandle()); |
| 51 return; |
| 52 } |
| 53 |
| 54 SkMemoryStream stream(shm->memory(), memory_size); |
| 55 int page_count = SkMultiPictureDocumentReadPageCount(&stream); |
| 56 if (!page_count) { |
| 57 DLOG(ERROR) << "CompositePdf: No page is read."; |
| 58 callback.Run(mojo::ScopedSharedBufferHandle()); |
| 59 return; |
| 60 } |
| 61 |
| 62 std::vector<SkDocumentPage> pages(page_count); |
| 63 if (!SkMultiPictureDocumentRead(&stream, pages.data(), page_count)) { |
| 64 DLOG(ERROR) << "CompositePdf: Page reading failed."; |
| 65 callback.Run(mojo::ScopedSharedBufferHandle()); |
| 66 return; |
| 67 } |
| 68 |
| 69 SkDynamicMemoryWStream wstream; |
| 70 sk_sp<SkDocument> doc = |
| 71 MakePdfDocument(creator_.size() ? creator_ : "Chromium", &wstream); |
| 72 |
| 73 for (const auto& page : pages) { |
| 74 SkCanvas* canvas = doc->beginPage(page.fSize.width(), page.fSize.height()); |
| 75 canvas->drawPicture(page.fPicture); |
| 76 doc->endPage(); |
| 77 } |
| 78 doc->close(); |
| 79 |
| 80 mojo::ScopedSharedBufferHandle buffer = |
| 81 mojo::SharedBufferHandle::Create(wstream.bytesWritten()); |
| 82 DCHECK(buffer.is_valid()); |
| 83 |
| 84 mojo::ScopedSharedBufferMapping mapping = buffer->Map(wstream.bytesWritten()); |
| 85 DCHECK(mapping); |
| 86 wstream.copyToAndReset(mapping.get()); |
| 87 |
| 88 callback.Run(std::move(buffer)); |
| 89 } |
| 90 |
| 91 } // namespace printing |
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