Removed unneeded cairo code.

printing/pdf_metafile_cairo_linux.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "printing/pdf_metafile_cairo_linux.h"
-
-#include <stdio.h>
-
-#include <cairo.h>
-#include <cairo-pdf.h>
-
-#include "base/eintr_wrapper.h"
-#include "base/file_descriptor_posix.h"
-#include "base/file_util.h"
-#include "base/logging.h"
-#include "printing/units.h"
-#include "skia/ext/vector_platform_device_cairo_linux.h"
-#include "ui/gfx/rect.h"
-#include "ui/gfx/size.h"
-
-namespace {
-
-// Tests if |surface| is valid.
-bool IsSurfaceValid(cairo_surface_t* surface) {
-  return cairo_surface_status(surface) == CAIRO_STATUS_SUCCESS;
-}
-
-// Tests if |context| is valid.
-bool IsContextValid(cairo_t* context) {
-  return cairo_status(context) == CAIRO_STATUS_SUCCESS;
-}
-
-// Destroys and resets |surface|.
-void CleanUpSurface(cairo_surface_t** surface) {
-  if (*surface) {
-    cairo_surface_destroy(*surface);
-    *surface = NULL;
-  }
-}
-
-// Destroys and resets |context|.
-void CleanUpContext(cairo_t** context) {
-  if (*context) {
-    cairo_destroy(*context);
-    *context = NULL;
-  }
-}
-
-// Callback function for Cairo to write PDF stream.
-// |dst_buffer| is actually a pointer of type `std::string*`.
-cairo_status_t WriteCairoStream(void* dst_buffer,
-                                const unsigned char* src_data,
-                                unsigned int src_data_length) {
-  DCHECK(dst_buffer);
-  DCHECK(src_data);
-  DCHECK_GT(src_data_length, 0u);
-
-  std::string* buffer = reinterpret_cast<std::string*>(dst_buffer);
-  buffer->append(reinterpret_cast<const char*>(src_data), src_data_length);
-
-  return CAIRO_STATUS_SUCCESS;
-}
-
-}  // namespace
-
-namespace printing {
-
-PdfMetafileCairo::PdfMetafileCairo()
-    : surface_(NULL),
-      context_(NULL),
-      current_data_(NULL) {
-}
-
-PdfMetafileCairo::~PdfMetafileCairo() {
-  // Releases all resources if we forgot to do so.
-  CleanUpAll();
-}
-
-bool PdfMetafileCairo::Init() {
-  // We need to check |current_data_| to ensure Init/InitFromData has not been
-  // called before.
-  DCHECK(!current_data_);
-
-  current_data_ = &cairo_data_;
-  // Creates an 1 by 1 Cairo surface for the entire PDF file.
-  // The size for each page will be overwritten later in StartPage().
-  surface_ = cairo_pdf_surface_create_for_stream(WriteCairoStream,
-                                                 current_data_, 1, 1);
-
-  // Cairo always returns a valid pointer.
-  // Hence, we have to check if it points to a "nil" object.
-  if (!IsSurfaceValid(surface_)) {
-    DLOG(ERROR) << "Cannot create Cairo surface for PdfMetafileCairo!";
-    CleanUpSurface(&surface_);
-    return false;
-  }
-
-  // Creates a context.
-  context_ = cairo_create(surface_);
-  if (!IsContextValid(context_)) {
-    DLOG(ERROR) << "Cannot create Cairo context for PdfMetafileCairo!";
-    CleanUpContext(&context_);
-    CleanUpSurface(&surface_);
-    return false;
-  }
-
-  return true;
-}
-
-bool PdfMetafileCairo::InitFromData(const void* src_buffer,
-                                    uint32 src_buffer_size) {
-  if (src_buffer == NULL || src_buffer_size == 0)
-    return false;
-
-  raw_data_ = std::string(reinterpret_cast<const char*>(src_buffer),
-                      src_buffer_size);
-  current_data_ = &raw_data_;
-  return true;
-}
-
-SkDevice* PdfMetafileCairo::StartPageForVectorCanvas(
-    const gfx::Size& page_size, const gfx::Rect& content_area,
-    const float& scale_factor) {
-  if (!StartPage(page_size, content_area, scale_factor))
-    return NULL;
-
-  return skia::VectorPlatformDeviceCairo::CreateDevice(
-      context_, page_size.width(), page_size.height(), true);
-}
-
-bool PdfMetafileCairo::StartPage(const gfx::Size& page_size,
-                                 const gfx::Rect& content_area,
-                                 const float& scale_factor) {
-  DCHECK(IsSurfaceValid(surface_));
-  DCHECK(IsContextValid(context_));
-  // Passing this check implies page_surface_ is NULL, and current_page_ is
-  // empty.
-  DCHECK_GT(page_size.width(), 0);
-  DCHECK_GT(page_size.height(), 0);
-  // |scale_factor| is not supported yet.
-  DCHECK_EQ(scale_factor, 1);
-
-  // Don't let WebKit draw over the margins.
-  cairo_surface_set_device_offset(surface_,
-                                  content_area.x(),
-                                  content_area.y());
-
-  cairo_pdf_surface_set_size(surface_, page_size.width(), page_size.height());
-  return context_ != NULL;
-}
-
-bool PdfMetafileCairo::FinishPage() {
-  DCHECK(IsSurfaceValid(surface_));
-  DCHECK(IsContextValid(context_));
-
-  // Flushes all rendering for current page.
-  cairo_surface_flush(surface_);
-  cairo_show_page(context_);
-  return true;
-}
-
-bool PdfMetafileCairo::FinishDocument() {
-  DCHECK(IsSurfaceValid(surface_));
-  DCHECK(IsContextValid(context_));
-
-  cairo_surface_finish(surface_);
-
-  DCHECK(!cairo_data_.empty());  // Make sure we did get something.
-
-  CleanUpContext(&context_);
-  CleanUpSurface(&surface_);
-  return true;
-}
-
-uint32 PdfMetafileCairo::GetDataSize() const {
-  // We need to check at least these two members to ensure that either Init()
-  // has been called to initialize |data_|, or metafile has been closed.
-  DCHECK(!context_);
-  DCHECK(!current_data_->empty());
-
-  return current_data_->size();
-}
-
-bool PdfMetafileCairo::GetData(void* dst_buffer, uint32 dst_buffer_size) const {
-  DCHECK(dst_buffer);
-  DCHECK_GT(dst_buffer_size, 0u);
-  memcpy(dst_buffer, current_data_->data(), dst_buffer_size);
-
-  return true;
-}
-
-cairo_t* PdfMetafileCairo::context() const {
-  return context_;
-}
-
-bool PdfMetafileCairo::SaveTo(const FilePath& file_path) const {
-  // We need to check at least these two members to ensure that either Init()
-  // has been called to initialize |data_|, or metafile has been closed.
-  DCHECK(!context_);
-  DCHECK(!current_data_->empty());
-
-  bool success = true;
-  if (file_util::WriteFile(file_path, current_data_->data(), GetDataSize())
-      != static_cast<int>(GetDataSize())) {
-    DLOG(ERROR) << "Failed to save file " << file_path.value().c_str();
-    success = false;
-  }
-  return success;
-}
-
-gfx::Rect PdfMetafileCairo::GetPageBounds(unsigned int page_number) const  {
-  NOTIMPLEMENTED();
-  return gfx::Rect();
-}
-
-unsigned int PdfMetafileCairo::GetPageCount() const {
-  NOTIMPLEMENTED();
-  return 1;
-}
-
-#if defined(OS_CHROMEOS)
-bool PdfMetafileCairo::SaveToFD(const base::FileDescriptor& fd) const {
-  // We need to check at least these two members to ensure that either Init()
-  // has been called to initialize |data_|, or metafile has been closed.
-  DCHECK(!context_);
-  DCHECK(!current_data_->empty());
-
-  if (fd.fd < 0) {
-    DLOG(ERROR) << "Invalid file descriptor!";
-    return false;
-  }
-
-  bool success = true;
-  if (file_util::WriteFileDescriptor(fd.fd, current_data_->data(),
-                                     GetDataSize()) < 0) {
-    DLOG(ERROR) << "Failed to save file with fd " << fd.fd;
-    success = false;
-  }
-
-  if (fd.auto_close) {
-    if (HANDLE_EINTR(close(fd.fd)) < 0) {
-      DPLOG(WARNING) << "close";
-      success = false;
-    }
-  }
-
-  return success;
-}
-#endif  // if defined(OS_CHROMEOS)
-
-void PdfMetafileCairo::CleanUpAll() {
-  CleanUpContext(&context_);
-  CleanUpSurface(&surface_);
-  cairo_data_.clear();
-  raw_data_.clear();
-  skia::VectorPlatformDeviceCairo::ClearFontCache();
-}
-
-}  // namespace printing