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
  37 // This struct represents all the data we need to draw and redraw this
  38 // page into a SkDocument.
  39 struct Page {
  40   Page(const SkSize& page_size, const SkRect& content_area, float scale)
  41       : page_size_(page_size),
  42         content_area_(content_area),
  43         scale_factor_(scale),
  44         content_(/*NULL*/) {}
  45   SkSize page_size_;
  46   SkRect content_area_;
  47   float scale_factor_;
  48   skia::RefPtr<SkPicture> content_;
  49 };
  50
  51 bool WriteAssetToBuffer(const SkStreamAsset* asset,
  52                         void* buffer,
  53                         size_t size) {
  54   // Calling duplicate() keeps original asset state unchanged.
  55   scoped_ptr<SkStreamAsset> assetCopy(asset->duplicate());
  56   size_t length = assetCopy->getLength();
  57   if (length > size)
  58     return false;
  59   return (length == assetCopy->read(buffer, length));
  60 }
  61
  62 }  // namespace
  63
  64 namespace printing {
  65
  66 struct PdfMetafileSkiaData {
  67   SkPictureRecorder recorder_;  // Current recording
  68
  69   std::vector<Page> pages_;
  70   scoped_ptr<SkStreamAsset> pdf_data_;
  71
  72 #if defined(OS_MACOSX)
  73   PdfMetafileCg pdf_cg_;
  74 #endif
  75 };
  76
  77 PdfMetafileSkia::~PdfMetafileSkia() {}
  78
  79 bool PdfMetafileSkia::Init() {
  80   return true;
  81 }
  82
  83 // TODO(halcanary): Create a Metafile class that only stores data.
  84 // Metafile::InitFromData is orthogonal to what the rest of
  85 // PdfMetafileSkia does.
  86 bool PdfMetafileSkia::InitFromData(const void* src_buffer,
  87                                    uint32 src_buffer_size) {
  88   data_->pdf_data_.reset(new SkMemoryStream(src_buffer, src_buffer_size, true));
  89   return true;
  90 }
  91
  92 bool PdfMetafileSkia::StartPage(const gfx::Size& page_size,
  93                                 const gfx::Rect& content_area,
  94                                 const float& scale_factor) {
  95   if (data_->recorder_.getRecordingCanvas())
  96     this->FinishPage();
  97   DCHECK(!data_->recorder_.getRecordingCanvas());
  98   SkSize sk_page_size = gfx::SizeFToSkSize(gfx::SizeF(page_size));
  99   data_->pages_.push_back(
 100       Page(sk_page_size, gfx::RectToSkRect(content_area), scale_factor));
 101   DCHECK_GT(scale_factor, 0.0f);
 102   // We scale the recording canvas's size so that
 103   // canvas->getTotalMatrix() returns a value that ignores the scale
 104   // factor.  We store the scale factor and re-apply it to the PDF
 105   // Canvas later.  http://crbug.com/469656
 106   // Recording canvas is owned by the data_->recorder_.  No ref() necessary.
 107   return !!data_->recorder_.beginRecording(sk_page_size.width() / scale_factor,
 108                                            sk_page_size.height() / scale_factor,
 109                                            NULL, 0);
 110 }
 111
 112 skia::PlatformCanvas* PdfMetafileSkia::GetVectorCanvasForNewPage(
 113     const gfx::Size& page_size,
 114     const gfx::Rect& content_area,
 115     const float& scale_factor) {
 116   if (!StartPage(page_size, content_area, scale_factor))
 117     return nullptr;
 118   return data_->recorder_.getRecordingCanvas();
 119 }
 120
 121 bool PdfMetafileSkia::FinishPage() {
 122   if (!data_->recorder_.getRecordingCanvas())
 123     return false;
 124   DCHECK(!(data_->pages_.back().content_));
 125   data_->pages_.back().content_ =
 126       skia::AdoptRef(data_->recorder_.endRecordingAsPicture());
 127   return true;
 128 }
 129
 130 bool PdfMetafileSkia::FinishDocument() {
 131   // If we've already set the data in InitFromData, leave it be.
 132   if (data_->pdf_data_)
 133     return false;
 134
 135   if (data_->recorder_.getRecordingCanvas())
 136     this->FinishPage();
 137
 138   SkDynamicMemoryWStream pdf_stream;
 139   skia::RefPtr<SkDocument> pdf_doc =
 140       skia::AdoptRef(SkDocument::CreatePDF(&pdf_stream));
 141   for (const auto& page : data_->pages_) {
 142     SkCanvas* canvas = pdf_doc->beginPage(
 143         page.page_size_.width(), page.page_size_.height(), &page.content_area_);
 144     // No need to save/restore, since this canvas is not reused after endPage()
 145     canvas->scale(page.scale_factor_, page.scale_factor_);
 146     canvas->drawPicture(page.content_.get());
 147     pdf_doc->endPage();
 148   }
 149   if (!pdf_doc->close())
 150     return false;
 151
 152   data_->pdf_data_.reset(pdf_stream.detachAsStream());
 153   return true;
 154 }
 155
 156 uint32 PdfMetafileSkia::GetDataSize() const {
 157   if (!data_->pdf_data_)
 158     return 0;
 159   return base::checked_cast<uint32>(data_->pdf_data_->getLength());
 160 }
 161
 162 bool PdfMetafileSkia::GetData(void* dst_buffer,
 163                               uint32 dst_buffer_size) const {
 164   if (!data_->pdf_data_)
 165     return false;
 166   return WriteAssetToBuffer(data_->pdf_data_.get(), dst_buffer,
 167                             base::checked_cast<size_t>(dst_buffer_size));
 168 }
 169
 170 gfx::Rect PdfMetafileSkia::GetPageBounds(unsigned int page_number) const {
 171   if (page_number < data_->pages_.size()) {
 172     return gfx::Rect(gfx::ToFlooredSize(
 173         gfx::SkSizeToSizeF(data_->pages_[page_number].page_size_)));
 174   }
 175   return gfx::Rect();
 176 }
 177
 178 unsigned int PdfMetafileSkia::GetPageCount() const {
 179   return base::checked_cast<unsigned int>(data_->pages_.size());
 180 }
 181
 182 gfx::NativeDrawingContext PdfMetafileSkia::context() const {
 183   NOTREACHED();
 184   return NULL;
 185 }
 186
 187 #if defined(OS_WIN)
 188 bool PdfMetafileSkia::Playback(gfx::NativeDrawingContext hdc,
 189                                const RECT* rect) const {
 190   NOTREACHED();
 191   return false;
 192 }
 193
 194 bool PdfMetafileSkia::SafePlayback(gfx::NativeDrawingContext hdc) const {
 195   NOTREACHED();
 196   return false;
 197 }
 198
 199 #elif defined(OS_MACOSX)
 200 /* TODO(caryclark): The set up of PluginInstance::PrintPDFOutput may result in
 201    rasterized output.  Even if that flow uses PdfMetafileCg::RenderPage,
 202    the drawing of the PDF into the canvas may result in a rasterized output.
 203    PDFMetafileSkia::RenderPage should be not implemented as shown and instead
 204    should do something like the following CL in PluginInstance::PrintPDFOutput:
 205 http://codereview.chromium.org/7200040/diff/1/webkit/plugins/ppapi/ppapi_plugin_instance.cc
 206 */
 207 bool PdfMetafileSkia::RenderPage(unsigned int page_number,
 208                                  CGContextRef context,
 209                                  const CGRect rect,
 210                                  const MacRenderPageParams& params) const {
 211   DCHECK_GT(GetDataSize(), 0U);
 212   if (data_->pdf_cg_.GetDataSize() == 0) {
 213     if (GetDataSize() == 0)
 214       return false;
 215     size_t length = data_->pdf_data_->getLength();
 216     std::vector<uint8_t> buffer(length);
 217     (void)WriteAssetToBuffer(data_->pdf_data_.get(), &buffer[0], length);
 218     data_->pdf_cg_.InitFromData(&buffer[0], base::checked_cast<uint32>(length));
 219   }
 220   return data_->pdf_cg_.RenderPage(page_number, context, rect, params);
 221 }
 222 #endif
 223
 224 bool PdfMetafileSkia::SaveTo(base::File* file) const {
 225   if (GetDataSize() == 0U)
 226     return false;
 227
 228   // Calling duplicate() keeps original asset state unchanged.
 229   scoped_ptr<SkStreamAsset> asset(data_->pdf_data_->duplicate());
 230
 231   const size_t maximum_buffer_size = 1024 * 1024;
 232   std::vector<char> buffer(std::min(maximum_buffer_size, asset->getLength()));
 233   do {
 234     size_t read_size = asset->read(&buffer[0], buffer.size());
 235     if (read_size == 0)
 236       break;
 237     DCHECK_GE(buffer.size(), read_size);
 238     if (!file->WriteAtCurrentPos(&buffer[0],
 239                                  base::checked_cast<int>(read_size))) {
 240       return false;
 241     }
 242   } while (!asset->isAtEnd());
 243
 244   return true;
 245 }
 246
 247 #if defined(OS_CHROMEOS) || defined(OS_ANDROID)
 248 bool PdfMetafileSkia::SaveToFD(const base::FileDescriptor& fd) const {
 249   DCHECK_GT(GetDataSize(), 0U);
 250
 251   if (fd.fd < 0) {
 252     DLOG(ERROR) << "Invalid file descriptor!";
 253     return false;
 254   }
 255   base::File file(fd.fd);
 256   bool result = SaveTo(&file);
 257   DLOG_IF(ERROR, !result) << "Failed to save file with fd " << fd.fd;
 258
 259   if (!fd.auto_close)
 260     file.TakePlatformFile();
 261   return result;
 262 }
 263 #endif
 264
 265 PdfMetafileSkia::PdfMetafileSkia() : data_(new PdfMetafileSkiaData) {
 266 }
 267
 268 scoped_ptr<PdfMetafileSkia> PdfMetafileSkia::GetMetafileForCurrentPage() {
 269   // If we only ever need the metafile for the last page, should we
 270   // only keep a handle on one SkPicture?
 271   scoped_ptr<PdfMetafileSkia> metafile(new PdfMetafileSkia);
 272
 273   if (data_->pages_.size() == 0)
 274     return metafile.Pass();
 275
 276   if (data_->recorder_.getRecordingCanvas())  // page outstanding
 277     return metafile.Pass();
 278
 279   const Page& page = data_->pages_.back();
 280
 281   metafile->data_->pages_.push_back(page);
 282
 283   if (!metafile->FinishDocument())  // Generate PDF.
 284     metafile.reset();
 285
 286   return metafile.Pass();
 287 }
 288
 289 }  // namespace printing