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/file_descriptor_posix.h"
   9 #include "base/file_util.h"
  10 #include "base/metrics/histogram.h"
  11 #include "base/posix/eintr_wrapper.h"
  12 #include "base/safe_numerics.h"
  13 #include "skia/ext/refptr.h"
  14 #include "skia/ext/vector_platform_device_skia.h"
  15 #include "third_party/skia/include/core/SkData.h"
  16 #include "third_party/skia/include/core/SkRefCnt.h"
  17 #include "third_party/skia/include/core/SkScalar.h"
  18 #include "third_party/skia/include/core/SkStream.h"
  19 #include "third_party/skia/include/core/SkTypeface.h"
  20 #include "third_party/skia/include/pdf/SkPDFDevice.h"
  21 #include "third_party/skia/include/pdf/SkPDFDocument.h"
  22 #include "ui/gfx/point.h"
  23 #include "ui/gfx/rect.h"
  24 #include "ui/gfx/size.h"
  25
  26 #if defined(OS_MACOSX)
  27 #include "printing/pdf_metafile_cg_mac.h"
  28 #endif
  29
  30 namespace printing {
  31
  32 struct PdfMetafileSkiaData {
  33   skia::RefPtr<SkPDFDevice> current_page_;
  34   SkPDFDocument pdf_doc_;
  35   SkDynamicMemoryWStream pdf_stream_;
  36 #if defined(OS_MACOSX)
  37   PdfMetafileCg pdf_cg_;
  38 #endif
  39 };
  40
  41 PdfMetafileSkia::~PdfMetafileSkia() {}
  42
  43 bool PdfMetafileSkia::Init() {
  44   return true;
  45 }
  46 bool PdfMetafileSkia::InitFromData(const void* src_buffer,
  47                                    uint32 src_buffer_size) {
  48   return data_->pdf_stream_.write(src_buffer, src_buffer_size);
  49 }
  50
  51 SkDevice* PdfMetafileSkia::StartPageForVectorCanvas(
  52     const gfx::Size& page_size, const gfx::Rect& content_area,
  53     const float& scale_factor) {
  54   DCHECK(!page_outstanding_);
  55   page_outstanding_ = true;
  56
  57   // Adjust for the margins and apply the scale factor.
  58   SkMatrix transform;
  59   transform.setTranslate(SkIntToScalar(content_area.x()),
  60                          SkIntToScalar(content_area.y()));
  61   transform.preScale(SkFloatToScalar(scale_factor),
  62                      SkFloatToScalar(scale_factor));
  63
  64   SkISize pdf_page_size = SkISize::Make(page_size.width(), page_size.height());
  65   SkISize pdf_content_size =
  66       SkISize::Make(content_area.width(), content_area.height());
  67   skia::RefPtr<SkPDFDevice> pdf_device =
  68       skia::AdoptRef(new skia::VectorPlatformDeviceSkia(
  69           pdf_page_size, pdf_content_size, transform));
  70   data_->current_page_ = pdf_device;
  71   return pdf_device.get();
  72 }
  73
  74 bool PdfMetafileSkia::StartPage(const gfx::Size& page_size,
  75                                 const gfx::Rect& content_area,
  76                                 const float& scale_factor) {
  77   NOTREACHED();
  78   return false;
  79 }
  80
  81 bool PdfMetafileSkia::FinishPage() {
  82   DCHECK(data_->current_page_.get());
  83
  84   data_->pdf_doc_.appendPage(data_->current_page_.get());
  85   page_outstanding_ = false;
  86   return true;
  87 }
  88
  89 bool PdfMetafileSkia::FinishDocument() {
  90   // Don't do anything if we've already set the data in InitFromData.
  91   if (data_->pdf_stream_.getOffset())
  92     return true;
  93
  94   if (page_outstanding_)
  95     FinishPage();
  96
  97   data_->current_page_.clear();
  98
  99   int font_counts[SkAdvancedTypefaceMetrics::kNotEmbeddable_Font + 1];
 100   data_->pdf_doc_.getCountOfFontTypes(font_counts);
 101   for (int type = 0;
 102        type <= SkAdvancedTypefaceMetrics::kNotEmbeddable_Font;
 103        type++) {
 104     for (int count = 0; count < font_counts[type]; count++) {
 105       UMA_HISTOGRAM_ENUMERATION(
 106           "PrintPreview.FontType", type,
 107           SkAdvancedTypefaceMetrics::kNotEmbeddable_Font + 1);
 108     }
 109   }
 110
 111   return data_->pdf_doc_.emitPDF(&data_->pdf_stream_);
 112 }
 113
 114 uint32 PdfMetafileSkia::GetDataSize() const {
 115   return base::checked_numeric_cast<uint32>(data_->pdf_stream_.getOffset());
 116 }
 117
 118 bool PdfMetafileSkia::GetData(void* dst_buffer,
 119                               uint32 dst_buffer_size) const {
 120   if (dst_buffer_size < GetDataSize())
 121     return false;
 122
 123   SkAutoDataUnref data(data_->pdf_stream_.copyToData());
 124   memcpy(dst_buffer, data->bytes(), dst_buffer_size);
 125   return true;
 126 }
 127
 128 bool PdfMetafileSkia::SaveTo(const base::FilePath& file_path) const {
 129   DCHECK_GT(data_->pdf_stream_.getOffset(), 0U);
 130   SkAutoDataUnref data(data_->pdf_stream_.copyToData());
 131   if (file_util::WriteFile(file_path,
 132                            reinterpret_cast<const char*>(data->data()),
 133                            GetDataSize()) != static_cast<int>(GetDataSize())) {
 134     DLOG(ERROR) << "Failed to save file " << file_path.value().c_str();
 135     return false;
 136   }
 137   return true;
 138 }
 139
 140 gfx::Rect PdfMetafileSkia::GetPageBounds(unsigned int page_number) const {
 141   // TODO(vandebo) add a method to get the page size for a given page to
 142   // SkPDFDocument.
 143   NOTIMPLEMENTED();
 144   return gfx::Rect();
 145 }
 146
 147 unsigned int PdfMetafileSkia::GetPageCount() const {
 148   // TODO(vandebo) add a method to get the number of pages to SkPDFDocument.
 149   NOTIMPLEMENTED();
 150   return 0;
 151 }
 152
 153 gfx::NativeDrawingContext PdfMetafileSkia::context() const {
 154   NOTREACHED();
 155   return NULL;
 156 }
 157
 158 #if defined(OS_WIN)
 159 bool PdfMetafileSkia::Playback(gfx::NativeDrawingContext hdc,
 160                                const RECT* rect) const {
 161   NOTREACHED();
 162   return false;
 163 }
 164
 165 bool PdfMetafileSkia::SafePlayback(gfx::NativeDrawingContext hdc) const {
 166   NOTREACHED();
 167   return false;
 168 }
 169
 170 HENHMETAFILE PdfMetafileSkia::emf() const {
 171   NOTREACHED();
 172   return NULL;
 173 }
 174 #elif defined(OS_MACOSX)
 175 /* TODO(caryclark): The set up of PluginInstance::PrintPDFOutput may result in
 176    rasterized output.  Even if that flow uses PdfMetafileCg::RenderPage,
 177    the drawing of the PDF into the canvas may result in a rasterized output.
 178    PDFMetafileSkia::RenderPage should be not implemented as shown and instead
 179    should do something like the following CL in PluginInstance::PrintPDFOutput:
 180 http://codereview.chromium.org/7200040/diff/1/webkit/plugins/ppapi/ppapi_plugin_instance.cc
 181 */
 182 bool PdfMetafileSkia::RenderPage(unsigned int page_number,
 183                                  CGContextRef context,
 184                                  const CGRect rect,
 185                                  const MacRenderPageParams& params) const {
 186   DCHECK_GT(data_->pdf_stream_.getOffset(), 0U);
 187   if (data_->pdf_cg_.GetDataSize() == 0) {
 188     SkAutoDataUnref data(data_->pdf_stream_.copyToData());
 189     data_->pdf_cg_.InitFromData(data->bytes(), data->size());
 190   }
 191   return data_->pdf_cg_.RenderPage(page_number, context, rect, params);
 192 }
 193 #endif
 194
 195 #if defined(OS_CHROMEOS)
 196 bool PdfMetafileSkia::SaveToFD(const base::FileDescriptor& fd) const {
 197   DCHECK_GT(data_->pdf_stream_.getOffset(), 0U);
 198
 199   if (fd.fd < 0) {
 200     DLOG(ERROR) << "Invalid file descriptor!";
 201     return false;
 202   }
 203
 204   bool result = true;
 205   SkAutoDataUnref data(data_->pdf_stream_.copyToData());
 206   if (file_util::WriteFileDescriptor(fd.fd,
 207                                      reinterpret_cast<const char*>(data->data()),
 208                                      GetDataSize()) !=
 209       static_cast<int>(GetDataSize())) {
 210     DLOG(ERROR) << "Failed to save file with fd " << fd.fd;
 211     result = false;
 212   }
 213
 214   if (fd.auto_close) {
 215     if (HANDLE_EINTR(close(fd.fd)) < 0) {
 216       DPLOG(WARNING) << "close";
 217       result = false;
 218     }
 219   }
 220   return result;
 221 }
 222 #endif
 223
 224 PdfMetafileSkia::PdfMetafileSkia()
 225     : data_(new PdfMetafileSkiaData),
 226       page_outstanding_(false) {
 227 }
 228
 229 PdfMetafileSkia* PdfMetafileSkia::GetMetafileForCurrentPage() {
 230   SkPDFDocument pdf_doc(SkPDFDocument::kDraftMode_Flags);
 231   SkDynamicMemoryWStream pdf_stream;
 232   if (!pdf_doc.appendPage(data_->current_page_.get()))
 233     return NULL;
 234
 235   if (!pdf_doc.emitPDF(&pdf_stream))
 236     return NULL;
 237
 238   SkAutoDataUnref data(pdf_stream.copyToData());
 239   if (data->size() == 0)
 240     return NULL;
 241
 242   PdfMetafileSkia* metafile = new PdfMetafileSkia;
 243   metafile->InitFromData(data->bytes(),
 244                          base::checked_numeric_cast<uint32>(data->size()));
 245   return metafile;
 246 }
 247
 248 }  // namespace printing