Remove calls to deprecated SkPDFDevice and SkPDFDocuemnt.

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.

BUG=278148

Review URL: https://codereview.chromium.org/694213002

Cr-Commit-Position: refs/heads/master@{#304379}

1 files changed, 150 insertions, 85 deletions

diff --git a/printing/pdf_metafile_skia.cc b/printing/pdf_metafile_skia.cc
index c63e308..e00ca9f 100644
--- a/printing/pdf_metafile_skia.cc
+++ b/printing/pdf_metafile_skia.cc
@@ -12,12 +12,13 @@
 #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/point.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
@@ -30,13 +31,56 @@
 #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 SkSize ToSkSize(const gfx::Size& size) {
+  return SkSize::Make(SkIntToScalar(size.width()),
+                      SkIntToScalar(size.height()));
+}
+
+static SkRect ToSkRect(const gfx::Rect& rect) {
+  return SkRect::MakeLTRB(SkIntToScalar(rect.x()), SkIntToScalar(rect.y()),
+                          SkIntToScalar(rect.right()),
+                          SkIntToScalar(rect.bottom()));
+}
+
+static gfx::Size ToGfxSize(const SkSize& size) {
+  return gfx::Size(SkScalarTruncToInt(size.width()),
+                   SkScalarTruncToInt(size.height()));
+}
+
+static bool WriteAssetToBuffer(SkStreamAsset* asset,
+                               void* buffer,
+                               size_t size) {
+  DCHECK(asset->getPosition() == 0);  // Be kind: please rewind.
+  size_t length = asset->getLength();
+  if (length > size)
+    return false;
+  bool success = (length == asset->read(buffer, length));
+  (void)asset->rewind();
+  return success;
+}
+
 namespace printing {
 
 struct PdfMetafileSkiaData {
-  skia::RefPtr<SkPDFDevice> current_page_;
-  skia::RefPtr<SkCanvas> current_page_canvas_;
-  SkPDFDocument pdf_doc_;
-  SkDynamicMemoryWStream pdf_stream_;
+  scoped_ptr<SkPictureRecorder> recorder_;  // Current recording
+
+  std::vector<Page> pages_;
+  skia::RefPtr<SkStreamAsset> pdf_data_;
+
 #if defined(OS_MACOSX)
   PdfMetafileCg pdf_cg_;
 #endif
@@ -47,31 +91,37 @@ 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) {
-  return data_->pdf_stream_.write(src_buffer, src_buffer_size);
+  if (data_->pdf_data_)
+    data_->pdf_data_.clear();  // free up RAM first.
+  SkDynamicMemoryWStream dynamic_memory;
+  if (!dynamic_memory.write(src_buffer, src_buffer_size))
+    return false;
+  data_->pdf_data_ = skia::AdoptRef(dynamic_memory.detachAsStream());
+  return true;
 }
 
 bool PdfMetafileSkia::StartPage(const gfx::Size& page_size,
                                 const gfx::Rect& content_area,
                                 const float& 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()));
+  if (data_->recorder_)
+    this->FinishPage();
+  DCHECK(!data_->recorder_);
+  data_->recorder_.reset(SkNEW(SkPictureRecorder));
+  SkSize sk_page_size = ToSkSize(page_size);
+  data_->pages_.push_back(Page(sk_page_size, ToSkRect(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);
   return true;
 }
 
@@ -81,68 +131,65 @@ skia::VectorCanvas* PdfMetafileSkia::GetVectorCanvasForNewPage(
     const float& scale_factor) {
   if (!StartPage(page_size, content_area, scale_factor))
     return nullptr;
-  return data_->current_page_canvas_.get();
+  return data_->recorder_->getRecordingCanvas();
 }
 
 bool PdfMetafileSkia::FinishPage() {
-  DCHECK(data_->current_page_canvas_);
-  DCHECK(data_->current_page_);
-
-  data_->current_page_canvas_.clear();  // Unref SkCanvas.
-  data_->pdf_doc_.appendPage(data_->current_page_.get());
+  if (!data_->recorder_)
+    return false;
+  DCHECK(!(data_->pages_.back().content_));
+  data_->pages_.back().content_ =
+      skia::AdoptRef(data_->recorder_->endRecording());
+  data_->recorder_.reset();
   return true;
 }
 
 bool PdfMetafileSkia::FinishDocument() {
-  // 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 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_)
+    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();
   }
+  if (!pdf_doc->close())
+    return false;
 
-  return data_->pdf_doc_.emitPDF(&data_->pdf_stream_);
+  data_->pdf_data_ = skia::AdoptRef(pdf_stream.detachAsStream());
+  return true;
 }
 
 uint32 PdfMetafileSkia::GetDataSize() const {
-  return base::checked_cast<uint32>(data_->pdf_stream_.getOffset());
+  if (!data_->pdf_data_)
+    return 0;
+  return base::checked_cast<uint32>(data_->pdf_data_->getLength());
 }
 
 bool PdfMetafileSkia::GetData(void* dst_buffer,
                               uint32 dst_buffer_size) const {
-  if (dst_buffer_size < GetDataSize())
+  if (!data_->pdf_data_)
     return false;
-
-  SkAutoDataUnref data(data_->pdf_stream_.copyToData());
-  memcpy(dst_buffer, data->bytes(), dst_buffer_size);
-  return true;
+  return WriteAssetToBuffer(data_->pdf_data_.get(), dst_buffer,
+                            base::checked_cast<size_t>(dst_buffer_size));
 }
 
 gfx::Rect PdfMetafileSkia::GetPageBounds(unsigned int page_number) const {
-  // TODO(vandebo) add a method to get the page size for a given page to
-  // SkPDFDocument.
-  NOTIMPLEMENTED();
+  if (page_number < data_->pages_.size())
+    return gfx::Rect(ToGfxSize(data_->pages_[page_number].page_size_));
   return gfx::Rect();
 }
 
 unsigned int PdfMetafileSkia::GetPageCount() const {
-  // TODO(vandebo) add a method to get the number of pages to SkPDFDocument.
-  NOTIMPLEMENTED();
-  return 0;
+  return base::checked_cast<unsigned int>(data_->pages_.size());
 }
 
 gfx::NativeDrawingContext PdfMetafileSkia::context() const {
@@ -174,10 +221,14 @@ bool PdfMetafileSkia::RenderPage(unsigned int page_number,
                                  CGContextRef context,
                                  const CGRect rect,
                                  const MacRenderPageParams& params) const {
-  DCHECK_GT(data_->pdf_stream_.getOffset(), 0U);
+  DCHECK_GT(GetDataSize(), 0U);
   if (data_->pdf_cg_.GetDataSize() == 0) {
-    SkAutoDataUnref data(data_->pdf_stream_.copyToData());
-    data_->pdf_cg_.InitFromData(data->bytes(), data->size());
+    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));
   }
   return data_->pdf_cg_.RenderPage(page_number, context, rect, params);
 }
@@ -186,17 +237,31 @@ bool PdfMetafileSkia::RenderPage(unsigned int page_number,
 bool PdfMetafileSkia::SaveTo(base::File* file) const {
   if (GetDataSize() == 0U)
     return false;
-  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;
+  DCHECK(data_->pdf_data_.get());
+  SkStreamAsset* asset = data_->pdf_data_.get();
+  DCHECK_EQ(asset->getPosition(), 0U);
+
+  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))) {
+      (void)asset->rewind();
+      return false;
+    }
+  } while (!asset->isAtEnd());
+
+  (void)asset->rewind();
+  return true;
 }
 
 #if defined(OS_CHROMEOS) || defined(OS_ANDROID)
 bool PdfMetafileSkia::SaveToFD(const base::FileDescriptor& fd) const {
-  DCHECK_GT(data_->pdf_stream_.getOffset(), 0U);
+  DCHECK_GT(GetDataSize(), 0U);
 
   if (fd.fd < 0) {
     DLOG(ERROR) << "Invalid file descriptor!";
@@ -216,24 +281,24 @@ PdfMetafileSkia::PdfMetafileSkia() : data_(new PdfMetafileSkiaData) {
 }
 
 scoped_ptr<PdfMetafileSkia> PdfMetafileSkia::GetMetafileForCurrentPage() {
-  scoped_ptr<PdfMetafileSkia> metafile;
-  SkPDFDocument pdf_doc(SkPDFDocument::kDraftMode_Flags);
-  if (!pdf_doc.appendPage(data_->current_page_.get()))
+  // 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)
     return metafile.Pass();
 
-  SkDynamicMemoryWStream pdf_stream;
-  if (!pdf_doc.emitPDF(&pdf_stream))
+  if (data_->recorder_)  // page outstanding
     return metafile.Pass();
 
-  SkAutoDataUnref data_copy(pdf_stream.copyToData());
-  if (data_copy->size() == 0)
-    return scoped_ptr<PdfMetafileSkia>();
+  const Page& page = data_->pages_.back();
+
+  metafile->data_->pages_.push_back(page);  // Copy page data;
+  // Should increment refcnt on page->content_.
 
-  metafile.reset(new PdfMetafileSkia);
-  if (!metafile->InitFromData(data_copy->bytes(),
-                              base::checked_cast<uint32>(data_copy->size()))) {
+  if (!metafile->FinishDocument())  // Generate PDF.
     metafile.reset();
-  }
+
   return metafile.Pass();
 }