printing/pdf_metafile_skia.cc

   1 // Copyright (c) 2012 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 "printing/pdf_metafile_skia.h"
   6
   7 #include "base/containers/hash_tables.h"
   8 #include "base/files/file_util.h"
   9 #include "base/metrics/histogram.h"
  10 #include "base/numerics/safe_conversions.h"
  11 #include "base/posix/eintr_wrapper.h"
  12 #include "skia/ext/refptr.h"
  13 #include "third_party/skia/include/core/SkData.h"
  14 #include "third_party/skia/include/core/SkDocument.h"
  15 #include "third_party/skia/include/core/SkPictureRecorder.h"
  16 #include "third_party/skia/include/core/SkRect.h"
  17 #include "third_party/skia/include/core/SkRefCnt.h"
  18 #include "third_party/skia/include/core/SkScalar.h"
  19 #include "third_party/skia/include/core/SkSize.h"
  20 #include "third_party/skia/include/core/SkStream.h"
  21 #include "ui/gfx/geometry/point.h"
  22 #include "ui/gfx/geometry/rect.h"
  23 #include "ui/gfx/geometry/size.h"
  24 #include "ui/gfx/geometry/size_conversions.h"
  25 #include "ui/gfx/skia_util.h"
  26
  27 #if defined(OS_MACOSX)
  28 #include "printing/pdf_metafile_cg_mac.h"
  29 #endif
  30
  31 #if defined(OS_POSIX)
  32 #include "base/file_descriptor_posix.h"
  33 #endif
  34
  35 namespace {
  36 // This struct represents all the data we need to draw and redraw this
  37 // page into a SkDocument.
  38 struct Page {
  39   Page(const SkSize& page_size, const SkRect& content_area)
  40       : page_size_(page_size),
  41         content_area_(content_area),
  42         content_(/*NULL*/) {}
  43   SkSize page_size_;
  44   SkRect content_area_;
  45   skia::RefPtr<SkPicture> content_;
  46 };
  47 }  // namespace
  48
  49 static bool WriteAssetToBuffer(const SkStreamAsset* asset,
  50                                void* buffer,
  51                                size_t size) {
  52   // Calling duplicate() keeps original asset state unchanged.
  53   scoped_ptr<SkStreamAsset> assetCopy(asset->duplicate());
  54   size_t length = assetCopy->getLength();
  55   if (length > size)
  56     return false;
  57   return (length == assetCopy->read(buffer, length));
  58 }
  59
  60 namespace printing {
  61
  62 struct PdfMetafileSkiaData {
  63   SkPictureRecorder recorder_;  // Current recording
  64
  65   std::vector<Page> pages_;
  66   scoped_ptr<SkStreamAsset> pdf_data_;
  67
  68 #if defined(OS_MACOSX)
  69   PdfMetafileCg pdf_cg_;
  70 #endif
  71 };
  72
  73 PdfMetafileSkia::~PdfMetafileSkia() {}
  74
  75 bool PdfMetafileSkia::Init() {
  76   return true;
  77 }
  78
  79 // TODO(halcanary): Create a Metafile class that only stores data.
  80 // Metafile::InitFromData is orthogonal to what the rest of
  81 // PdfMetafileSkia does.
  82 bool PdfMetafileSkia::InitFromData(const void* src_buffer,
  83                                    uint32 src_buffer_size) {
  84   data_->pdf_data_.reset(new SkMemoryStream(src_buffer, src_buffer_size, true));
  85   return true;
  86 }
  87
  88 bool PdfMetafileSkia::StartPage(const gfx::Size& page_size,
  89                                 const gfx::Rect& content_area,
  90                                 const float& scale_factor) {
  91   if (data_->recorder_.getRecordingCanvas())
  92     this->FinishPage();
  93   DCHECK(!data_->recorder_.getRecordingCanvas());
  94   SkSize sk_page_size = gfx::SizeFToSkSize(gfx::SizeF(page_size));
  95   data_->pages_.push_back(Page(sk_page_size, gfx::RectToSkRect(content_area)));
  96
  97   SkCanvas* recordingCanvas = data_->recorder_.beginRecording(
  98       sk_page_size.width(), sk_page_size.height(), NULL, 0);
  99   // recordingCanvas is owned by the data_->recorder_.  No ref() necessary.
 100   if (!recordingCanvas)
 101     return false;
 102   recordingCanvas->scale(scale_factor, scale_factor);
 103   return true;
 104 }
 105
 106 skia::PlatformCanvas* PdfMetafileSkia::GetVectorCanvasForNewPage(
 107     const gfx::Size& page_size,
 108     const gfx::Rect& content_area,
 109     const float& scale_factor) {
 110   if (!StartPage(page_size, content_area, scale_factor))
 111     return nullptr;
 112   return data_->recorder_.getRecordingCanvas();
 113 }
 114
 115 bool PdfMetafileSkia::FinishPage() {
 116   if (!data_->recorder_.getRecordingCanvas())
 117     return false;
 118   DCHECK(!(data_->pages_.back().content_));
 119   data_->pages_.back().content_ =
 120       skia::AdoptRef(data_->recorder_.endRecording());
 121   return true;
 122 }
 123
 124 bool PdfMetafileSkia::FinishDocument() {
 125   // If we've already set the data in InitFromData, leave it be.
 126   if (data_->pdf_data_)
 127     return false;
 128
 129   if (data_->recorder_.getRecordingCanvas())
 130     this->FinishPage();
 131
 132   SkDynamicMemoryWStream pdf_stream;
 133   skia::RefPtr<SkDocument> pdf_doc =
 134       skia::AdoptRef(SkDocument::CreatePDF(&pdf_stream));
 135   for (const auto& page : data_->pages_) {
 136     SkCanvas* canvas = pdf_doc->beginPage(
 137         page.page_size_.width(), page.page_size_.height(), &page.content_area_);
 138     canvas->drawPicture(page.content_.get());
 139     pdf_doc->endPage();
 140   }
 141   if (!pdf_doc->close())
 142     return false;
 143
 144   data_->pdf_data_.reset(pdf_stream.detachAsStream());
 145   return true;
 146 }
 147
 148 uint32 PdfMetafileSkia::GetDataSize() const {
 149   if (!data_->pdf_data_)
 150     return 0;
 151   return base::checked_cast<uint32>(data_->pdf_data_->getLength());
 152 }
 153
 154 bool PdfMetafileSkia::GetData(void* dst_buffer,
 155                               uint32 dst_buffer_size) const {
 156   if (!data_->pdf_data_)
 157     return false;
 158   return WriteAssetToBuffer(data_->pdf_data_.get(), dst_buffer,
 159                             base::checked_cast<size_t>(dst_buffer_size));
 160 }
 161
 162 gfx::Rect PdfMetafileSkia::GetPageBounds(unsigned int page_number) const {
 163   if (page_number < data_->pages_.size()) {
 164     return gfx::Rect(gfx::ToFlooredSize(
 165         gfx::SkSizeToSizeF(data_->pages_[page_number].page_size_)));
 166   }
 167   return gfx::Rect();
 168 }
 169
 170 unsigned int PdfMetafileSkia::GetPageCount() const {
 171   return base::checked_cast<unsigned int>(data_->pages_.size());
 172 }
 173
 174 gfx::NativeDrawingContext PdfMetafileSkia::context() const {
 175   NOTREACHED();
 176   return NULL;
 177 }
 178
 179 #if defined(OS_WIN)
 180 bool PdfMetafileSkia::Playback(gfx::NativeDrawingContext hdc,
 181                                const RECT* rect) const {
 182   NOTREACHED();
 183   return false;
 184 }
 185
 186 bool PdfMetafileSkia::SafePlayback(gfx::NativeDrawingContext hdc) const {
 187   NOTREACHED();
 188   return false;
 189 }
 190
 191 #elif defined(OS_MACOSX)
 192 /* TODO(caryclark): The set up of PluginInstance::PrintPDFOutput may result in
 193    rasterized output.  Even if that flow uses PdfMetafileCg::RenderPage,
 194    the drawing of the PDF into the canvas may result in a rasterized output.
 195    PDFMetafileSkia::RenderPage should be not implemented as shown and instead
 196    should do something like the following CL in PluginInstance::PrintPDFOutput:
 197 http://codereview.chromium.org/7200040/diff/1/webkit/plugins/ppapi/ppapi_plugin_instance.cc
 198 */
 199 bool PdfMetafileSkia::RenderPage(unsigned int page_number,
 200                                  CGContextRef context,
 201                                  const CGRect rect,
 202                                  const MacRenderPageParams& params) const {
 203   DCHECK_GT(GetDataSize(), 0U);
 204   if (data_->pdf_cg_.GetDataSize() == 0) {
 205     if (GetDataSize() == 0)
 206       return false;
 207     size_t length = data_->pdf_data_->getLength();
 208     std::vector<uint8_t> buffer(length);
 209     (void)WriteAssetToBuffer(data_->pdf_data_.get(), &buffer[0], length);
 210     data_->pdf_cg_.InitFromData(&buffer[0], base::checked_cast<uint32>(length));
 211   }
 212   return data_->pdf_cg_.RenderPage(page_number, context, rect, params);
 213 }
 214 #endif
 215
 216 bool PdfMetafileSkia::SaveTo(base::File* file) const {
 217   if (GetDataSize() == 0U)
 218     return false;
 219
 220   // Calling duplicate() keeps original asset state unchanged.
 221   scoped_ptr<SkStreamAsset> asset(data_->pdf_data_->duplicate());
 222
 223   const size_t maximum_buffer_size = 1024 * 1024;
 224   std::vector<char> buffer(std::min(maximum_buffer_size, asset->getLength()));
 225   do {
 226     size_t read_size = asset->read(&buffer[0], buffer.size());
 227     if (read_size == 0)
 228       break;
 229     DCHECK_GE(buffer.size(), read_size);
 230     if (!file->WriteAtCurrentPos(&buffer[0],
 231                                  base::checked_cast<int>(read_size))) {
 232       return false;
 233     }
 234   } while (!asset->isAtEnd());
 235
 236   return true;
 237 }
 238
 239 #if defined(OS_CHROMEOS) || defined(OS_ANDROID)
 240 bool PdfMetafileSkia::SaveToFD(const base::FileDescriptor& fd) const {
 241   DCHECK_GT(GetDataSize(), 0U);
 242
 243   if (fd.fd < 0) {
 244     DLOG(ERROR) << "Invalid file descriptor!";
 245     return false;
 246   }
 247   base::File file(fd.fd);
 248   bool result = SaveTo(&file);
 249   DLOG_IF(ERROR, !result) << "Failed to save file with fd " << fd.fd;
 250
 251   if (!fd.auto_close)
 252     file.TakePlatformFile();
 253   return result;
 254 }
 255 #endif
 256
 257 PdfMetafileSkia::PdfMetafileSkia() : data_(new PdfMetafileSkiaData) {
 258 }
 259
 260 scoped_ptr<PdfMetafileSkia> PdfMetafileSkia::GetMetafileForCurrentPage() {
 261   // If we only ever need the metafile for the last page, should we
 262   // only keep a handle on one SkPicture?
 263   scoped_ptr<PdfMetafileSkia> metafile(new PdfMetafileSkia);
 264
 265   if (data_->pages_.size() == 0)
 266     return metafile.Pass();
 267
 268   if (data_->recorder_.getRecordingCanvas())  // page outstanding
 269     return metafile.Pass();
 270
 271   const Page& page = data_->pages_.back();
 272
 273   metafile->data_->pages_.push_back(page);
 274
 275   if (!metafile->FinishDocument())  // Generate PDF.
 276     metafile.reset();
 277
 278   return metafile.Pass();
 279 }
 280
 281 }  // namespace printing