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 <sal/config.h>
  12
  13 #include <string_view>
  14
  15 #include <unotest/bootstrapfixturebase.hxx>
  16 #include <vcl/graphicfilter.hxx>
  17 #include <vcl/BitmapReadAccess.hxx>
  18 #include <tools/stream.hxx>
  19 #include <graphic/GraphicFormatDetector.hxx>
  20
  21 constexpr OUStringLiteral gaDataUrl(u"/vcl/qa/cppunit/jpeg/data/");
  22
  23 class JpegWriterTest : public test::BootstrapFixtureBase
  24 {
  25     OUString getFullUrl(std::u16string_view sFileName)
  26     {
  27         return m_directories.getURLFromSrc(gaDataUrl) + sFileName;
  28     }
  29
  30     BitmapEx load(const OUString& aURL);
  31     BitmapEx roundtripJPG(const BitmapEx& bitmap);
  32     BitmapEx roundtripJPG(const OUString& aURL);
  33
  34 public:
  35     void testWrite8BitGrayscale();
  36     void testWrite8BitNonGrayscale();
  37
  38     CPPUNIT_TEST_SUITE(JpegWriterTest);
  39     CPPUNIT_TEST(testWrite8BitGrayscale);
  40     CPPUNIT_TEST(testWrite8BitNonGrayscale);
  41     CPPUNIT_TEST_SUITE_END();
  42 };
  43
  44 BitmapEx JpegWriterTest::load(const OUString& aURL)
  45 {
  46     GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
  47     Graphic aGraphic;
  48     SvFileStream aFileStream(aURL, StreamMode::READ);
  49     ErrCode bResult = rFilter.ImportGraphic(aGraphic, aURL, aFileStream);
  50     CPPUNIT_ASSERT_EQUAL(ERRCODE_NONE, bResult);
  51     return aGraphic.GetBitmapEx();
  52 }
  53
  54 BitmapEx JpegWriterTest::roundtripJPG(const OUString& aURL) { return roundtripJPG(load(aURL)); }
  55
  56 BitmapEx JpegWriterTest::roundtripJPG(const BitmapEx& bitmap)
  57 {
  58     // EXPORT JPEG
  59     SvMemoryStream aStream;
  60     GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
  61     sal_uInt16 exportFormatJPG = rFilter.GetExportFormatNumberForShortName(JPG_SHORTNAME);
  62     Graphic aExportGraphic(bitmap);
  63     ErrCode bResult = rFilter.ExportGraphic(aExportGraphic, u"memory", aStream, exportFormatJPG);
  64     CPPUNIT_ASSERT_EQUAL(ERRCODE_NONE, bResult);
  65     //Detect the magic bytes - we need to be sure the file is actually a JPEG
  66     aStream.Seek(0);
  67     vcl::GraphicFormatDetector aDetector(aStream, "");
  68     CPPUNIT_ASSERT(aDetector.detect());
  69     CPPUNIT_ASSERT(aDetector.checkJPG());
  70     // IMPORT JPEG
  71     aStream.Seek(0);
  72     Graphic aImportGraphic;
  73     sal_uInt16 importFormatJPG = rFilter.GetImportFormatNumberForShortName(JPG_SHORTNAME);
  74     bResult = rFilter.ImportGraphic(aImportGraphic, u"memory", aStream, importFormatJPG);
  75     CPPUNIT_ASSERT_EQUAL(ERRCODE_NONE, bResult);
  76     return aImportGraphic.GetBitmapEx();
  77 }
  78
  79 void JpegWriterTest::testWrite8BitGrayscale()
  80 {
  81     Bitmap bitmap = roundtripJPG(getFullUrl(u"8BitGrayscale.jpg")).GetBitmap();
  82     Bitmap::ScopedReadAccess access(bitmap);
  83     const ScanlineFormat format = access->GetScanlineFormat();
  84     // Check that it's still 8bit grayscale.
  85     CPPUNIT_ASSERT_EQUAL(ScanlineFormat::N8BitPal, format);
  86     CPPUNIT_ASSERT(bitmap.HasGreyPalette8Bit());
  87     // Check that the content is valid.
  88     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_WHITE), access->GetColor(0, 0));
  89     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_WHITE), access->GetColor(0, access->Width() - 1));
  90     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_WHITE), access->GetColor(access->Height() - 1, 0));
  91     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_BLACK),
  92                          access->GetColor(access->Height() - 1, access->Width() - 1));
  93 }
  94
  95 void JpegWriterTest::testWrite8BitNonGrayscale()
  96 {
  97     Bitmap bitmap = roundtripJPG(getFullUrl(u"8BitNonGrayscale.gif")).GetBitmap();
  98     Bitmap::ScopedReadAccess access(bitmap);
  99     const ScanlineFormat format = access->GetScanlineFormat();
 100     // Check that it's still 8bit grayscale.
 101     CPPUNIT_ASSERT_EQUAL(ScanlineFormat::N8BitPal, format);
 102     // The original image has grayscale palette, just with entries in a different order.
 103     // Do not check for grayscale 8bit, the roundtrip apparently fixes that. What's important
 104     // is the content.
 105     CPPUNIT_ASSERT(bitmap.HasGreyPaletteAny());
 106     // CPPUNIT_ASSERT(bitmap.HasGreyPalette8Bit());
 107     // Check that the content is valid.
 108     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_WHITE), access->GetColor(0, 0));
 109     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_WHITE), access->GetColor(0, access->Width() - 1));
 110     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_WHITE), access->GetColor(access->Height() - 1, 0));
 111     CPPUNIT_ASSERT_EQUAL(BitmapColor(COL_BLACK),
 112                          access->GetColor(access->Height() - 1, access->Width() - 1));
 113 }
 114
 115 CPPUNIT_TEST_SUITE_REGISTRATION(JpegWriterTest);
 116
 117 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */