Implement native metafile for printing on Linux.

printing/pdf_ps_metafile_linux_unittest.cc

+// Copyright (c) 2009 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_ps_metafile_linux.h"
+
+#include <string>
+#include <vector>
+
+#include "base/file_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+typedef struct _cairo cairo_t;
+
+TEST(PdfTest, Basic) {
+  // Tests in-renderer constructor.
+  printing::PdfPsMetafile pdf(printing::PdfPsMetafile::PDF);
+  cairo_t* context = pdf.GetPageContext();
+  EXPECT_TRUE(context == NULL);
+
+  // Renders page 1.
+  EXPECT_TRUE(pdf.StartPage(72, 72));
+  context = pdf.GetPageContext();
+  EXPECT_TRUE(context != NULL);
+  // In theory, we should use Cairo to draw something on |context|.
+  pdf.FinishPage(1.5);
+  context = pdf.GetPageContext();
+  EXPECT_TRUE(context == NULL);
+
+  // Renders page 2.
+  EXPECT_TRUE(pdf.StartPage(64, 64));
+  context = pdf.GetPageContext();
+  EXPECT_TRUE(context != NULL);
+  // In theory, we should use Cairo to draw something on |context|.
+  pdf.FinishPage(0.5);
+  context = pdf.GetPageContext();
+  EXPECT_TRUE(context == NULL);
+
+  // Closes the file.
+  pdf.Close();
+  context = pdf.GetPageContext();
+  EXPECT_TRUE(context == NULL);
+
+  // Checks data size.
+  unsigned int size = pdf.GetDataSize();
+  EXPECT_GT(size, 0u);
+
+  // Gets resulting data.
+  std::vector<char> buffer(size, 0x00);
+  pdf.GetData(&buffer.front(), size);
+
+  // Tests another constructor.
+  printing::PdfPsMetafile pdf2(printing::PdfPsMetafile::PDF,
+                               &buffer.front(),
+                               size);
+
+  // Tries to get the first 4 characters from pdf2.
+  std::vector<char> buffer2(4, 0x00);
+  pdf2.GetData(&buffer2.front(), 4);
+
+  // Tests if the header begins with "%PDF".
+  std::string header(&buffer2.front(), 4);
+  EXPECT_EQ(header.find("%PDF", 0), 0u);
+
+  // Tests if we can save data.
+  EXPECT_TRUE(pdf.SaveTo(FilePath("/dev/null")));
+}
+
+TEST(PsTest, Basic) {
+  // Tests in-renderer constructor.
+  printing::PdfPsMetafile ps(printing::PdfPsMetafile::PS);
+  cairo_t* context = ps.GetPageContext();
+  EXPECT_TRUE(context == NULL);
+
+  // Renders page 1.
+  EXPECT_TRUE(ps.StartPage(72, 72));
+  context = ps.GetPageContext();
+  EXPECT_TRUE(context != NULL);
+  // In theory, we should use Cairo to draw something on |context|.
+  ps.FinishPage(1.5);
+  context = ps.GetPageContext();
+  EXPECT_TRUE(context == NULL);
+
+  // Renders page 2.
+  EXPECT_TRUE(ps.StartPage(64, 64));
+  context = ps.GetPageContext();
+  EXPECT_TRUE(context != NULL);
+  // In theory, we should use Cairo to draw something on |context|.
+  ps.FinishPage(0.5);
+  context = ps.GetPageContext();
+  EXPECT_TRUE(context == NULL);
+
+  // Closes the file.
+  ps.Close();
+  context = ps.GetPageContext();
+  EXPECT_TRUE(context == NULL);
+
+  // Checks data size.
+  unsigned int size = ps.GetDataSize();
+  EXPECT_GT(size, 0u);
+
+  // Gets resulting data.
+  std::vector<char> buffer(size, 0x00);
+  ps.GetData(&buffer.front(), size);
+
+  // Tests another constructor.
+  printing::PdfPsMetafile ps2(printing::PdfPsMetafile::PS,
+                              &buffer.front(),
+                              size);
+
+  // Tries to get the first 4 characters from ps2.
+  std::vector<char> buffer2(4, 0x00);
+  ps2.GetData(&buffer2.front(), 4);
+
+  // Tests if the header begins with "%!PS".
+  std::string header(&buffer2.front(), 4);
+  EXPECT_EQ(header.find("%!PS", 0), 0u);
+
+  // Tests if we can save data.
+  EXPECT_TRUE(ps.SaveTo(FilePath("/dev/null")));
+}
+