Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 312 insertions, 0 deletions

diff --git a/vcl/qa/cppunit/BitmapScaleTest.cxx b/vcl/qa/cppunit/BitmapScaleTest.cxx
new file mode 100644
index 000000000..ce8f67437
--- /dev/null
+++ b/vcl/qa/cppunit/BitmapScaleTest.cxx
@@ -0,0 +1,312 @@
+/* -*- 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: */