content/test/image_decoder_test.h

   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 #ifndef CONTENT_TEST_IMAGE_DECODER_TEST_H_
   6 #define CONTENT_TEST_IMAGE_DECODER_TEST_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/basictypes.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/files/file_path.h"
  14
  15 #include "testing/gtest/include/gtest/gtest.h"
  16
  17 namespace blink { class WebImageDecoder; }
  18
  19 // If CALCULATE_MD5_SUMS is not defined, then this test decodes a handful of
  20 // image files and compares their MD5 sums to the stored sums on disk.
  21 //
  22 // To recalculate the MD5 sums, uncommment CALCULATE_MD5_SUMS.
  23 //
  24 // The image files and corresponding MD5 sums live in the directory
  25 // chrome/test/data/*_decoder (where "*" is the format being tested).
  26 //
  27 // Note: The MD5 sums calculated in this test by little- and big-endian systems
  28 // will differ, since no endianness correction is done.  If we start compiling
  29 // for big endian machines this should be fixed.
  30
  31 // #define CALCULATE_MD5_SUMS
  32
  33 enum ImageDecoderTestFileSelection {
  34   TEST_ALL,
  35   TEST_SMALLER,
  36   TEST_BIGGER,
  37 };
  38
  39 // Returns the path the decoded data is saved at.
  40 base::FilePath GetMD5SumPath(const base::FilePath& path);
  41
  42 class ImageDecoderTest : public testing::Test {
  43  public:
  44   explicit ImageDecoderTest(const std::string& format) : format_(format) { }
  45
  46  protected:
  47   virtual void SetUp() OVERRIDE;
  48
  49   // Returns the vector of image files for testing.
  50   std::vector<base::FilePath> GetImageFiles() const;
  51
  52   // Returns true if the image is bogus and should not be successfully decoded.
  53   bool ShouldImageFail(const base::FilePath& path) const;
  54
  55   // Tests if decoder decodes image at image_path with underlying frame at
  56   // index desired_frame_index. The md5_sum_path is needed if the test is not
  57   // asked to generate one i.e. if # #define CALCULATE_MD5_SUMS is set.
  58   void TestWebKitImageDecoder(const base::FilePath& image_path,
  59     const base::FilePath& md5_sum_path, int desired_frame_index) const;
  60
  61   // Verifies each of the test image files is decoded correctly and matches the
  62   // expected state. |file_selection| and |threshold| can be used to select
  63   // files to test based on file size.
  64   // If just the MD5 sum is wanted, this skips chunking.
  65   void TestDecoding(ImageDecoderTestFileSelection file_selection,
  66                     const int64 threshold);
  67
  68   void TestDecoding()  {
  69     TestDecoding(TEST_ALL, 0);
  70   }
  71
  72   // Creates WebKit API's decoder.
  73   virtual blink::WebImageDecoder* CreateWebKitImageDecoder() const = 0;
  74
  75   // The format to be decoded, like "bmp" or "ico".
  76   std::string format_;
  77
  78  protected:
  79   // Path to the test files.
  80   base::FilePath data_dir_;
  81
  82  private:
  83   DISALLOW_COPY_AND_ASSIGN(ImageDecoderTest);
  84 };
  85
  86 #endif  // CONTENT_TEST_IMAGE_DECODER_TEST_H_