314 lines
13 KiB
C++
314 lines
13 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include <cppunit/TestAssert.h>
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#include <cppunit/TestFixture.h>
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#include <cppunit/extensions/HelperMacros.h>
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#include <vcl/bitmap.hxx>
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#include <tools/stream.hxx>
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#include <vcl/graphicfilter.hxx>
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#include <BitmapSymmetryCheck.hxx>
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#include <vcl/BitmapWriteAccess.hxx>
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namespace
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{
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class BitmapScaleTest : public CppUnit::TestFixture
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{
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void testScale();
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void testScale2();
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void testScaleSymmetry();
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CPPUNIT_TEST_SUITE(BitmapScaleTest);
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CPPUNIT_TEST(testScale);
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CPPUNIT_TEST(testScale2);
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CPPUNIT_TEST(testScaleSymmetry);
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CPPUNIT_TEST_SUITE_END();
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};
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bool checkBitmapColor(Bitmap const& rBitmap, Color const& rExpectedColor)
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{
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bool bResult = true;
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Bitmap aBitmap(rBitmap);
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BitmapScopedReadAccess pReadAccess(aBitmap);
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tools::Long nHeight = pReadAccess->Height();
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tools::Long nWidth = pReadAccess->Width();
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for (tools::Long y = 0; y < nHeight; ++y)
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{
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Scanline pScanlineRead = pReadAccess->GetScanline(y);
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for (tools::Long x = 0; x < nWidth; ++x)
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{
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Color aColor = pReadAccess->GetPixelFromData(pScanlineRead, x);
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if (aColor != rExpectedColor)
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bResult = false;
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}
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}
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return bResult;
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}
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void assertColorsAreSimilar(int maxDifference, int line, const BitmapColor& expected,
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const BitmapColor& actual)
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{
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// Check that the two colors match or are reasonably similar.
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if (expected.GetColorError(actual) <= maxDifference)
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return;
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std::stringstream stream;
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stream << "Line: " << line;
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CPPUNIT_ASSERT_EQUAL_MESSAGE(stream.str(), expected, actual);
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}
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void BitmapScaleTest::testScale()
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{
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const bool bExportBitmap(false);
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using tools::Rectangle;
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static const BmpScaleFlag scaleMethods[]
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= { BmpScaleFlag::Default, BmpScaleFlag::Fast, BmpScaleFlag::BestQuality,
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BmpScaleFlag::Interpolate, BmpScaleFlag::Lanczos, BmpScaleFlag::BiCubic,
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BmpScaleFlag::BiLinear };
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for (BmpScaleFlag scaleMethod : scaleMethods)
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{
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struct ScaleSize
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{
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Size srcSize;
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Size destSize;
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};
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static const ScaleSize scaleSizes[]
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= { // test no-op
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{ Size(16, 16), Size(16, 16) },
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// powers of 2 (OpenGL may use texture atlas)
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{ Size(16, 16), Size(14, 14) },
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{ Size(14, 14), Size(16, 16) }, // both upscaling and downscaling
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// "random" sizes
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{ Size(18, 18), Size(14, 14) },
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{ Size(14, 14), Size(18, 18) },
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// different x/y ratios
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{ Size(16, 30), Size(14, 18) },
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{ Size(14, 18), Size(16, 30) },
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// ratio larger than 16 (triggers different paths in some OpenGL algorithms)
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{ Size(18 * 20, 18 * 20), Size(14, 14) },
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{ Size(14, 14), Size(18 * 20, 18 * 20) },
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// Boundary cases.
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{ Size(1, 1), Size(1, 1) },
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{ Size(16, 1), Size(12, 1) },
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{ Size(1, 16), Size(1, 12) }
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};
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for (const ScaleSize& scaleSize : scaleSizes)
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{
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OString testStr = "Testing scale (" + scaleSize.srcSize.toString() + ")->("
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+ scaleSize.destSize.toString() + "), method "
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+ OString::number(static_cast<int>(scaleMethod));
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fprintf(stderr, "%s\n", testStr.getStr());
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Bitmap bitmap(scaleSize.srcSize, vcl::PixelFormat::N24_BPP);
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{
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// Fill each quarter of the source bitmap with a different color,
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// and center with yet another color.
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BitmapScopedWriteAccess writeAccess(bitmap);
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const int halfW = scaleSize.srcSize.getWidth() / 2;
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const int halfH = scaleSize.srcSize.getHeight() / 2;
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const Size aSize(std::max(halfW, 1), std::max(halfH, 1));
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writeAccess->SetFillColor(COL_GREEN);
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writeAccess->FillRect(Rectangle(Point(0, 0), aSize));
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writeAccess->SetFillColor(COL_RED);
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writeAccess->FillRect(Rectangle(Point(0, halfH), aSize));
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writeAccess->SetFillColor(COL_YELLOW);
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writeAccess->FillRect(Rectangle(Point(halfW, 0), aSize));
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writeAccess->SetFillColor(COL_BLACK);
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writeAccess->FillRect(Rectangle(Point(halfW, halfH), aSize));
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writeAccess->SetFillColor(COL_BLUE);
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writeAccess->FillRect(Rectangle(Point(halfW / 2, halfH / 2), aSize));
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}
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if (bExportBitmap)
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{
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SvFileStream aStream(u"~/scale_before.png"_ustr,
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StreamMode::WRITE | StreamMode::TRUNC);
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GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
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rFilter.compressAsPNG(BitmapEx(bitmap), aStream);
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}
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CPPUNIT_ASSERT(bitmap.Scale(scaleSize.destSize, scaleMethod));
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if (bExportBitmap)
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{
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SvFileStream aStream(u"~/scale_after.png"_ustr,
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StreamMode::WRITE | StreamMode::TRUNC);
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GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
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rFilter.compressAsPNG(BitmapEx(bitmap), aStream);
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}
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CPPUNIT_ASSERT_EQUAL(scaleSize.destSize, bitmap.GetSizePixel());
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const int lastW = scaleSize.destSize.getWidth() - 1;
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const int lastH = scaleSize.destSize.getHeight() - 1;
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if (scaleSize.srcSize.getWidth() == 1 && scaleSize.srcSize.getHeight() == 1)
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{
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BitmapReadAccess readAccess(bitmap);
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assertColorsAreSimilar(2, __LINE__, COL_BLUE, readAccess.GetColor(0, 0));
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assertColorsAreSimilar(2, __LINE__, COL_BLUE, readAccess.GetColor(lastH, 0));
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assertColorsAreSimilar(2, __LINE__, COL_BLUE, readAccess.GetColor(0, lastW));
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assertColorsAreSimilar(2, __LINE__, COL_BLUE, readAccess.GetColor(lastH, lastW));
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assertColorsAreSimilar(2, __LINE__, COL_BLUE,
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readAccess.GetColor(lastH / 2, lastW / 2));
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}
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else if (lastW && lastH)
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{
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// Scaling should keep each quarter of the resulting bitmap have the same color,
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// so check that color in each corner of the result bitmap is the same color,
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// or reasonably close (some algorithms may alter the color very slightly).
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BitmapReadAccess readAccess(bitmap);
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assertColorsAreSimilar(2, __LINE__, COL_GREEN, readAccess.GetColor(0, 0));
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assertColorsAreSimilar(2, __LINE__, COL_RED, readAccess.GetColor(lastH, 0));
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assertColorsAreSimilar(2, __LINE__, COL_YELLOW, readAccess.GetColor(0, lastW));
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assertColorsAreSimilar(2, __LINE__, COL_BLACK, readAccess.GetColor(lastH, lastW));
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assertColorsAreSimilar(2, __LINE__, COL_BLUE,
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readAccess.GetColor(lastH / 2, lastW / 2));
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}
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else if (lastW)
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{
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BitmapReadAccess readAccess(bitmap);
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assertColorsAreSimilar(2, __LINE__, COL_RED, readAccess.GetColor(0, 0));
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assertColorsAreSimilar(2, __LINE__, COL_BLACK, readAccess.GetColor(0, lastW));
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assertColorsAreSimilar(2, __LINE__, COL_BLUE, readAccess.GetColor(0, lastW / 2));
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}
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else if (lastH)
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{
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BitmapReadAccess readAccess(bitmap);
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assertColorsAreSimilar(2, __LINE__, COL_YELLOW, readAccess.GetColor(0, 0));
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assertColorsAreSimilar(2, __LINE__, COL_BLACK, readAccess.GetColor(lastH, 0));
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assertColorsAreSimilar(2, __LINE__, COL_BLUE, readAccess.GetColor(lastH / 2, 0));
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}
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}
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}
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}
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void BitmapScaleTest::testScale2()
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{
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const bool bExportBitmap(false);
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Bitmap aBitmap24Bit(Size(4096, 4096), vcl::PixelFormat::N24_BPP);
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CPPUNIT_ASSERT_EQUAL(vcl::PixelFormat::N24_BPP, aBitmap24Bit.getPixelFormat());
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Color aBitmapColor = COL_YELLOW;
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{
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BitmapScopedWriteAccess aWriteAccess(aBitmap24Bit);
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aWriteAccess->Erase(aBitmapColor);
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}
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if (bExportBitmap)
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{
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SvFileStream aStream(u"scale_before.png"_ustr, StreamMode::WRITE | StreamMode::TRUNC);
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GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
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rFilter.compressAsPNG(BitmapEx(aBitmap24Bit), aStream);
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}
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// Scale - 65x65
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(4096), aBitmap24Bit.GetSizePixel().Width());
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(4096), aBitmap24Bit.GetSizePixel().Height());
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Bitmap aScaledBitmap = aBitmap24Bit;
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aScaledBitmap.Scale(Size(65, 65));
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if (bExportBitmap)
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{
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SvFileStream aStream(u"scale_after_65x65.png"_ustr, StreamMode::WRITE | StreamMode::TRUNC);
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GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
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rFilter.compressAsPNG(BitmapEx(aScaledBitmap), aStream);
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}
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(65), aScaledBitmap.GetSizePixel().Width());
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(65), aScaledBitmap.GetSizePixel().Height());
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CPPUNIT_ASSERT(checkBitmapColor(aScaledBitmap, aBitmapColor));
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// Scale - 64x64
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(4096), aBitmap24Bit.GetSizePixel().Width());
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(4096), aBitmap24Bit.GetSizePixel().Height());
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aScaledBitmap = aBitmap24Bit;
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aScaledBitmap.Scale(Size(64, 64));
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if (bExportBitmap)
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{
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SvFileStream aStream(u"scale_after_64x64.png"_ustr, StreamMode::WRITE | StreamMode::TRUNC);
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GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
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rFilter.compressAsPNG(BitmapEx(aScaledBitmap), aStream);
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}
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(64), aScaledBitmap.GetSizePixel().Width());
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(64), aScaledBitmap.GetSizePixel().Height());
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CPPUNIT_ASSERT(checkBitmapColor(aScaledBitmap, aBitmapColor));
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// Scale - 63x63
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(4096), aBitmap24Bit.GetSizePixel().Width());
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(4096), aBitmap24Bit.GetSizePixel().Height());
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aScaledBitmap = aBitmap24Bit;
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aScaledBitmap.Scale(Size(63, 63));
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if (bExportBitmap)
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{
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SvFileStream aStream(u"scale_after_63x63.png"_ustr, StreamMode::WRITE | StreamMode::TRUNC);
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GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
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rFilter.compressAsPNG(BitmapEx(aScaledBitmap), aStream);
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}
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(63), aScaledBitmap.GetSizePixel().Width());
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(63), aScaledBitmap.GetSizePixel().Height());
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CPPUNIT_ASSERT(checkBitmapColor(aScaledBitmap, aBitmapColor));
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}
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void BitmapScaleTest::testScaleSymmetry()
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{
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const bool bExportBitmap(false);
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Bitmap aBitmap24Bit(Size(10, 10), vcl::PixelFormat::N24_BPP);
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CPPUNIT_ASSERT_EQUAL(vcl::PixelFormat::N24_BPP, aBitmap24Bit.getPixelFormat());
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{
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BitmapScopedWriteAccess aWriteAccess(aBitmap24Bit);
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aWriteAccess->Erase(COL_WHITE);
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aWriteAccess->SetLineColor(COL_BLACK);
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aWriteAccess->DrawRect(tools::Rectangle(1, 1, 8, 8));
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aWriteAccess->DrawRect(tools::Rectangle(3, 3, 6, 6));
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}
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BitmapSymmetryCheck aBitmapSymmetryCheck;
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(10), aBitmap24Bit.GetSizePixel().Width());
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(10), aBitmap24Bit.GetSizePixel().Height());
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// Check symmetry of the bitmap
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CPPUNIT_ASSERT(BitmapSymmetryCheck::check(aBitmap24Bit));
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if (bExportBitmap)
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{
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SvFileStream aStream(u"~/scale_before.png"_ustr, StreamMode::WRITE | StreamMode::TRUNC);
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GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
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rFilter.compressAsPNG(BitmapEx(aBitmap24Bit), aStream);
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}
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aBitmap24Bit.Scale(2, 2, BmpScaleFlag::Fast);
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(20), aBitmap24Bit.GetSizePixel().Width());
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CPPUNIT_ASSERT_EQUAL(static_cast<tools::Long>(20), aBitmap24Bit.GetSizePixel().Height());
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// After scaling the bitmap should still be symmetrical. This check guarantees that
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// scaling doesn't misalign the bitmap.
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CPPUNIT_ASSERT(BitmapSymmetryCheck::check(aBitmap24Bit));
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if (bExportBitmap)
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{
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SvFileStream aStream(u"~/scale_after.png"_ustr, StreamMode::WRITE | StreamMode::TRUNC);
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GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
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rFilter.compressAsPNG(BitmapEx(aBitmap24Bit), aStream);
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}
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}
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} // namespace
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CPPUNIT_TEST_SUITE_REGISTRATION(BitmapScaleTest);
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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