Revert of Remove calls to deprecated SkPDFDevice and SkPDFDocuemnt. (patchset #6 id:140001 of https://codereview.chromium.org/821703005/)

Reason for revert:
A bisect proved that this change caused
https://code.google.com/p/chromium/issues/detail?id=446729

Original issue's description:
> Remove calls to deprecated SkPDFDevice and SkPDFDocuemnt.
>
> This relands http://crrev.com/694213002
>
> In the PdfMetafileSkia class, Instead of storing a
> SkPDFDocument, store a vector of pages as
> SkPictures.  This allows access to individual at any
> time.  When FinishDocument() is called, use the
> SkDocument API to print all pages to PDF.
>
> In PrintWebViewHelper::RenderPageContent, skip clipping
> content to content area, since Windows printing prints
> content just outside of the content area, as noted in
> http://crbug.com/434079 .
>
> BUG=278148
>
> Committed: https://crrev.com/18387e7ebb0eae6e4944e841d63ea058adab6e11
> Cr-Commit-Position: refs/heads/master@{#310032}

TBR=vitalybuka@chromium.org,reed@google.com,danakj@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=278148
BUG=446729

Review URL: https://codereview.chromium.org/788053006

Cr-Commit-Position: refs/heads/master@{#310517}

1 files changed, 85 insertions, 130 deletions

diff --git a/printing/pdf_metafile_skia.cc b/printing/pdf_metafile_skia.cc
index 1d1f4fc..7f640ad 100644
--- a/printing/pdf_metafile_skia.cc
+++ b/printing/pdf_metafile_skia.cc
@@ -12,18 +12,15 @@
 #include "skia/ext/refptr.h"
 #include "skia/ext/vector_canvas.h"
 #include "third_party/skia/include/core/SkData.h"
-#include "third_party/skia/include/core/SkDocument.h"
-#include "third_party/skia/include/core/SkPictureRecorder.h"
-#include "third_party/skia/include/core/SkRect.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
 #include "third_party/skia/include/core/SkScalar.h"
-#include "third_party/skia/include/core/SkSize.h"
 #include "third_party/skia/include/core/SkStream.h"
+#include "third_party/skia/include/core/SkTypeface.h"
+#include "third_party/skia/include/pdf/SkPDFDevice.h"
+#include "third_party/skia/include/pdf/SkPDFDocument.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
-#include "ui/gfx/geometry/size_conversions.h"
-#include "ui/gfx/skia_util.h"
 
 #if defined(OS_MACOSX)
 #include "printing/pdf_metafile_cg_mac.h"
@@ -33,39 +30,13 @@
 #include "base/file_descriptor_posix.h"
 #endif
 
-namespace {
-// This struct represents all the data we need to draw and redraw this
-// page into a SkDocument.
-struct Page {
-  Page(const SkSize& page_size, const SkRect& content_area)
-      : page_size_(page_size),
-        content_area_(content_area),
-        content_(/*NULL*/) {}
-  SkSize page_size_;
-  SkRect content_area_;
-  skia::RefPtr<SkPicture> content_;
-};
-}  // namespace
-
-static bool WriteAssetToBuffer(const SkStreamAsset* asset,
-                               void* buffer,
-                               size_t size) {
-  // Calling duplicate() keeps original asset state unchanged.
-  skia::RefPtr<SkStreamAsset> assetCopy = skia::AdoptRef(asset->duplicate());
-  size_t length = assetCopy->getLength();
-  if (length > size)
-    return false;
-  return (length == assetCopy->read(buffer, length));
-}
-
 namespace printing {
 
 struct PdfMetafileSkiaData {
-  SkPictureRecorder recorder_;  // Current recording
-
-  std::vector<Page> pages_;
-  skia::RefPtr<SkStreamAsset> pdf_data_;
-
+  skia::RefPtr<SkPDFDevice> current_page_;
+  skia::RefPtr<SkCanvas> current_page_canvas_;
+  SkPDFDocument pdf_doc_;
+  SkDynamicMemoryWStream pdf_stream_;
 #if defined(OS_MACOSX)
   PdfMetafileCg pdf_cg_;
 #endif
@@ -76,32 +47,31 @@ PdfMetafileSkia::~PdfMetafileSkia() {}
 bool PdfMetafileSkia::Init() {
   return true;
 }
-
-// TODO(halcanary): Create a Metafile class that only stores data.
-// Metafile::InitFromData is orthogonal to what the rest of
-// PdfMetafileSkia does.
 bool PdfMetafileSkia::InitFromData(const void* src_buffer,
                                    uint32 src_buffer_size) {
-  data_->pdf_data_ =
-      skia::AdoptRef(new SkMemoryStream(src_buffer, src_buffer_size, true));
-  return true;
+  return data_->pdf_stream_.write(src_buffer, src_buffer_size);
 }
 
 bool PdfMetafileSkia::StartPage(const gfx::Size& page_size,
                                 const gfx::Rect& content_area,
                                 const float& scale_factor) {
-  if (data_->recorder_.getRecordingCanvas())
-    this->FinishPage();
-  DCHECK(!data_->recorder_.getRecordingCanvas());
-  SkSize sk_page_size = gfx::SizeFToSkSize(gfx::SizeF(page_size));
-  data_->pages_.push_back(Page(sk_page_size, gfx::RectToSkRect(content_area)));
-
-  SkCanvas* recordingCanvas = data_->recorder_.beginRecording(
-      sk_page_size.width(), sk_page_size.height(), NULL, 0);
-  // recordingCanvas is owned by the data_->recorder_.  No ref() necessary.
-  if (!recordingCanvas)
-    return false;
-  recordingCanvas->scale(scale_factor, scale_factor);
+  DCHECK(!data_->current_page_canvas_);
+
+  // Adjust for the margins and apply the scale factor.
+  SkMatrix transform;
+  transform.setTranslate(SkIntToScalar(content_area.x()),
+                         SkIntToScalar(content_area.y()));
+  transform.preScale(SkFloatToScalar(scale_factor),
+                     SkFloatToScalar(scale_factor));
+
+  SkISize pdf_page_size = SkISize::Make(page_size.width(), page_size.height());
+  SkISize pdf_content_size =
+      SkISize::Make(content_area.width(), content_area.height());
+
+  data_->current_page_ = skia::AdoptRef(
+      new SkPDFDevice(pdf_page_size, pdf_content_size, transform));
+  data_->current_page_canvas_ =
+      skia::AdoptRef(new SkCanvas(data_->current_page_.get()));
   return true;
 }
 
@@ -111,66 +81,68 @@ skia::VectorCanvas* PdfMetafileSkia::GetVectorCanvasForNewPage(
     const float& scale_factor) {
   if (!StartPage(page_size, content_area, scale_factor))
     return nullptr;
-  return data_->recorder_.getRecordingCanvas();
+  return data_->current_page_canvas_.get();
 }
 
 bool PdfMetafileSkia::FinishPage() {
-  if (!data_->recorder_.getRecordingCanvas())
-    return false;
-  DCHECK(!(data_->pages_.back().content_));
-  data_->pages_.back().content_ =
-      skia::AdoptRef(data_->recorder_.endRecording());
+  DCHECK(data_->current_page_canvas_);
+  DCHECK(data_->current_page_);
+
+  data_->current_page_canvas_.clear();  // Unref SkCanvas.
+  data_->pdf_doc_.appendPage(data_->current_page_.get());
   return true;
 }
 
 bool PdfMetafileSkia::FinishDocument() {
-  // If we've already set the data in InitFromData, overwrite it.
-  if (data_->pdf_data_)
-    data_->pdf_data_.clear();  // Free up RAM first.
-
-  if (data_->recorder_.getRecordingCanvas())
-    this->FinishPage();
-
-  SkDynamicMemoryWStream pdf_stream;
-  skia::RefPtr<SkDocument> pdf_doc =
-      skia::AdoptRef(SkDocument::CreatePDF(&pdf_stream));
-  for (const auto& page : data_->pages_) {
-    SkCanvas* canvas = pdf_doc->beginPage(
-        page.page_size_.width(), page.page_size_.height(), &page.content_area_);
-    canvas->drawPicture(page.content_.get());
-    pdf_doc->endPage();
+  // Don't do anything if we've already set the data in InitFromData.
+  if (data_->pdf_stream_.getOffset())
+    return true;
+
+  if (data_->current_page_canvas_)
+    FinishPage();
+
+  data_->current_page_.clear();
+
+  int font_counts[SkAdvancedTypefaceMetrics::kOther_Font + 2];
+  data_->pdf_doc_.getCountOfFontTypes(font_counts);
+  for (int type = 0;
+       type <= SkAdvancedTypefaceMetrics::kOther_Font + 1;
+       type++) {
+    for (int count = 0; count < font_counts[type]; count++) {
+      UMA_HISTOGRAM_ENUMERATION(
+          "PrintPreview.FontType", type,
+          SkAdvancedTypefaceMetrics::kOther_Font + 2);
+    }
   }
-  if (!pdf_doc->close())
-    return false;
 
-  data_->pdf_data_ = skia::AdoptRef(pdf_stream.detachAsStream());
-  return true;
+  return data_->pdf_doc_.emitPDF(&data_->pdf_stream_);
 }
 
 uint32 PdfMetafileSkia::GetDataSize() const {
-  if (!data_->pdf_data_)
-    return 0;
-  return base::checked_cast<uint32>(data_->pdf_data_->getLength());
+  return base::checked_cast<uint32>(data_->pdf_stream_.getOffset());
 }
 
 bool PdfMetafileSkia::GetData(void* dst_buffer,
                               uint32 dst_buffer_size) const {
-  if (!data_->pdf_data_)
+  if (dst_buffer_size < GetDataSize())
     return false;
-  return WriteAssetToBuffer(data_->pdf_data_.get(), dst_buffer,
-                            base::checked_cast<size_t>(dst_buffer_size));
+
+  SkAutoDataUnref data(data_->pdf_stream_.copyToData());
+  memcpy(dst_buffer, data->bytes(), dst_buffer_size);
+  return true;
 }
 
 gfx::Rect PdfMetafileSkia::GetPageBounds(unsigned int page_number) const {
-  if (page_number < data_->pages_.size()) {
-    return gfx::Rect(gfx::ToFlooredSize(
-        gfx::SkSizeToSizeF(data_->pages_[page_number].page_size_)));
-  }
+  // TODO(vandebo) add a method to get the page size for a given page to
+  // SkPDFDocument.
+  NOTIMPLEMENTED();
   return gfx::Rect();
 }
 
 unsigned int PdfMetafileSkia::GetPageCount() const {
-  return base::checked_cast<unsigned int>(data_->pages_.size());
+  // TODO(vandebo) add a method to get the number of pages to SkPDFDocument.
+  NOTIMPLEMENTED();
+  return 0;
 }
 
 gfx::NativeDrawingContext PdfMetafileSkia::context() const {
@@ -202,14 +174,10 @@ bool PdfMetafileSkia::RenderPage(unsigned int page_number,
                                  CGContextRef context,
                                  const CGRect rect,
                                  const MacRenderPageParams& params) const {
-  DCHECK_GT(GetDataSize(), 0U);
+  DCHECK_GT(data_->pdf_stream_.getOffset(), 0U);
   if (data_->pdf_cg_.GetDataSize() == 0) {
-    if (GetDataSize() == 0)
-      return false;
-    size_t length = data_->pdf_data_->getLength();
-    std::vector<uint8_t> buffer(length);
-    (void)WriteAssetToBuffer(data_->pdf_data_.get(), &buffer[0], length);
-    data_->pdf_cg_.InitFromData(&buffer[0], base::checked_cast<uint32>(length));
+    SkAutoDataUnref data(data_->pdf_stream_.copyToData());
+    data_->pdf_cg_.InitFromData(data->bytes(), data->size());
   }
   return data_->pdf_cg_.RenderPage(page_number, context, rect, params);
 }
@@ -218,31 +186,17 @@ bool PdfMetafileSkia::RenderPage(unsigned int page_number,
 bool PdfMetafileSkia::SaveTo(base::File* file) const {
   if (GetDataSize() == 0U)
     return false;
-  DCHECK(data_->pdf_data_.get());
-
-  // Calling duplicate() keeps original asset state unchanged.
-  skia::RefPtr<SkStreamAsset> asset =
-      skia::AdoptRef(data_->pdf_data_->duplicate());
-
-  const size_t maximum_buffer_size = 1024 * 1024;
-  std::vector<char> buffer(std::min(maximum_buffer_size, asset->getLength()));
-  do {
-    size_t read_size = asset->read(&buffer[0], buffer.size());
-    if (read_size == 0)
-      break;
-    DCHECK_GE(buffer.size(), read_size);
-    if (!file->WriteAtCurrentPos(&buffer[0],
-                                 base::checked_cast<int>(read_size))) {
-      return false;
-    }
-  } while (!asset->isAtEnd());
-
-  return true;
+  SkAutoDataUnref data(data_->pdf_stream_.copyToData());
+  // TODO(halcanary): rewrite this function without extra data copy
+  // using SkStreamAsset.
+  const char* ptr = reinterpret_cast<const char*>(data->data());
+  int size = base::checked_cast<int>(data->size());
+  return file->WriteAtCurrentPos(ptr, size) == size;
 }
 
 #if defined(OS_CHROMEOS) || defined(OS_ANDROID)
 bool PdfMetafileSkia::SaveToFD(const base::FileDescriptor& fd) const {
-  DCHECK_GT(GetDataSize(), 0U);
+  DCHECK_GT(data_->pdf_stream_.getOffset(), 0U);
 
   if (fd.fd < 0) {
     DLOG(ERROR) << "Invalid file descriptor!";
@@ -262,23 +216,24 @@ PdfMetafileSkia::PdfMetafileSkia() : data_(new PdfMetafileSkiaData) {
 }
 
 scoped_ptr<PdfMetafileSkia> PdfMetafileSkia::GetMetafileForCurrentPage() {
-  // If we only ever need the metafile for the last page, should we
-  // only keep a handle on one SkPicture?
-  scoped_ptr<PdfMetafileSkia> metafile(new PdfMetafileSkia);
-
-  if (data_->pages_.size() == 0)
+  scoped_ptr<PdfMetafileSkia> metafile;
+  SkPDFDocument pdf_doc(SkPDFDocument::kDraftMode_Flags);
+  if (!pdf_doc.appendPage(data_->current_page_.get()))
     return metafile.Pass();
 
-  if (data_->recorder_.getRecordingCanvas())  // page outstanding
+  SkDynamicMemoryWStream pdf_stream;
+  if (!pdf_doc.emitPDF(&pdf_stream))
     return metafile.Pass();
 
-  const Page& page = data_->pages_.back();
+  SkAutoDataUnref data_copy(pdf_stream.copyToData());
+  if (data_copy->size() == 0)
+    return scoped_ptr<PdfMetafileSkia>();
 
-  metafile->data_->pages_.push_back(page);
-
-  if (!metafile->FinishDocument())  // Generate PDF.
+  metafile.reset(new PdfMetafileSkia);
+  if (!metafile->InitFromData(data_copy->bytes(),
+                              base::checked_cast<uint32>(data_copy->size()))) {
     metafile.reset();
-
+  }
   return metafile.Pass();
 }