vcl/qa/cppunit/jpeg/JpegWriterTest.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  */
  10
  11 #include <unotest/bootstrapfixturebase.hxx>
  12 #include <vcl/graphicfilter.hxx>
  13 #include <vcl/bitmapaccess.hxx>
  14 #include <tools/stream.hxx>
  15
  16 constexpr OUStringLiteral gaDataUrl(u"/vcl/qa/cppunit/jpeg/data/");
  17
  18 class JpegWriterTest : public test::BootstrapFixtureBase
  19 {
  20     OUString getFullUrl(const OUString& sFileName)
  21     {
  22         return m_directories.getURLFromSrc(gaDataUrl) + sFileName;
  23     }
  24
  25     BitmapEx load(const OUString& aURL);
  26     BitmapEx roundtripJPG(const BitmapEx& bitmap);
  27     BitmapEx roundtripJPG(const OUString& aURL);
  28
  29 public:
  30     void testWrite8BitGrayscale();
  31     void testWrite8BitNonGrayscale();
  32
  33     CPPUNIT_TEST_SUITE(JpegWriterTest);
  34     CPPUNIT_TEST(testWrite8BitGrayscale);
  35     CPPUNIT_TEST(testWrite8BitNonGrayscale);
  36     CPPUNIT_TEST_SUITE_END();
  37 };
  38
  39 BitmapEx JpegWriterTest::load(const OUString& aURL)
  40 {
  41     GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
  42     Graphic aGraphic;
  43     SvFileStream aFileStream(aURL, StreamMode::READ);
  44     ErrCode bResult = rFilter.ImportGraphic(aGraphic, aURL, aFileStream);
  45     CPPUNIT_ASSERT_EQUAL(ERRCODE_NONE, bResult);
  46     return aGraphic.GetBitmapEx();
  47 }
  48
  49 BitmapEx JpegWriterTest::roundtripJPG(const OUString& aURL) { return roundtripJPG(load(aURL)); }
  50
  51 BitmapEx JpegWriterTest::roundtripJPG(const BitmapEx& bitmap)
  52 {
  53     SvMemoryStream stream;
  54     GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
  55     sal_uInt16 exportFormatJPG = rFilter.GetExportFormatNumberForShortName(JPG_SHORTNAME);
  56     Graphic aExportGraphic(bitmap);
  57     ErrCode bResult = rFilter.ExportGraphic(aExportGraphic, "memory", stream, exportFormatJPG);
  58     CPPUNIT_ASSERT_EQUAL(ERRCODE_NONE, bResult);
  59     stream.Seek(0);
  60     Graphic aImportGraphic;
  61     sal_uInt16 importFormatJPG = rFilter.GetImportFormatNumberForShortName(JPG_SHORTNAME);
  62     bResult = rFilter.ImportGraphic(aImportGraphic, "memory", stream, importFormatJPG);
  63     CPPUNIT_ASSERT_EQUAL(ERRCODE_NONE, bResult);
  64     return aImportGraphic.GetBitmapEx();
  65 }
  66
  67 void JpegWriterTest::testWrite8BitGrayscale()
  68 {
  69     Bitmap bitmap = roundtripJPG(getFullUrl("8BitGrayscale.jpg")).GetBitmap();
  70     Bitmap::ScopedReadAccess access(bitmap);
  71     const ScanlineFormat format = access->GetScanlineFormat();
  72     // Check that it's still 8bit grayscale.
  73     CPPUNIT_ASSERT_EQUAL(ScanlineFormat::N8BitPal, format);
  74     CPPUNIT_ASSERT(bitmap.HasGreyPalette8Bit());
  75     // Check that the content is valid.
  76     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_WHITE), access->GetColor(0, 0));
  77     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_WHITE), access->GetColor(0, access->Width() - 1));
  78     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_WHITE), access->GetColor(access->Height() - 1, 0));
  79     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_BLACK),
  80                          access->GetColor(access->Height() - 1, access->Width() - 1));
  81 }
  82
  83 void JpegWriterTest::testWrite8BitNonGrayscale()
  84 {
  85     Bitmap bitmap = roundtripJPG(getFullUrl("8BitNonGrayscale.gif")).GetBitmap();
  86     Bitmap::ScopedReadAccess access(bitmap);
  87     const ScanlineFormat format = access->GetScanlineFormat();
  88     // Check that it's still 8bit grayscale.
  89     CPPUNIT_ASSERT_EQUAL(ScanlineFormat::N8BitPal, format);
  90     // The original image has grayscale palette, just with entries in a different order.
  91     // Do not check for grayscale 8bit, the roundtrip apparently fixes that. What's important
  92     // is the content.
  93     CPPUNIT_ASSERT(bitmap.HasGreyPaletteAny());
  94     // CPPUNIT_ASSERT(bitmap.HasGreyPalette8Bit());
  95     // Check that the content is valid.
  96     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_WHITE), access->GetColor(0, 0));
  97     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_WHITE), access->GetColor(0, access->Width() - 1));
  98     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_WHITE), access->GetColor(access->Height() - 1, 0));
  99     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_BLACK),
 100                          access->GetColor(access->Height() - 1, access->Width() - 1));
 101 }
 102
 103 CPPUNIT_TEST_SUITE_REGISTRATION(JpegWriterTest);
 104
 105 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */