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