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libreoffice/vcl/qa/cppunit/cjktext.cxx
Daniel Baumann 8e63e14cf6
Adding upstream version 4:25.2.3. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-22 16:20:04 +02:00

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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 <osl/file.hxx>
#include <osl/process.h>
#include <test/bootstrapfixture.hxx>
#include <sal/log.hxx>
#include <tools/stream.hxx>
#include <vcl/BitmapReadAccess.hxx>
#include <comphelper/errcode.hxx>
#include <vcl/graphicfilter.hxx>
#include <vcl/settings.hxx>
#include <vcl/svapp.hxx>
#include <vcl/virdev.hxx>
#include <ImplLayoutArgs.hxx>
#include <TextLayoutCache.hxx>
#include <salgdi.hxx>
class VclCjkTextTest : public test::BootstrapFixture
{
// if enabled - check the result images with:
// "xdg-open ./workdir/CppunitTest/vcl_cjk_test.test.core/"
static constexpr const bool mbExportBitmap = false;
void exportDevice(const OUString& filename, const VclPtr<VirtualDevice>& device)
{
if (mbExportBitmap)
{
BitmapEx aBitmapEx(device->GetBitmapEx(Point(0, 0), device->GetOutputSizePixel()));
OUString cwd;
CPPUNIT_ASSERT_EQUAL(osl_Process_E_None, osl_getProcessWorkingDir(&cwd.pData));
OUString url;
CPPUNIT_ASSERT_EQUAL(osl::FileBase::E_None,
osl::FileBase::getAbsoluteFileURL(cwd, filename, url));
SvFileStream aStream(url, StreamMode::WRITE | StreamMode::TRUNC);
CPPUNIT_ASSERT_EQUAL(
ERRCODE_NONE, GraphicFilter::GetGraphicFilter().compressAsPNG(aBitmapEx, aStream));
}
}
void testVerticalText();
public:
VclCjkTextTest()
: BootstrapFixture(true, false)
{
}
CPPUNIT_TEST_SUITE(VclCjkTextTest);
CPPUNIT_TEST(testVerticalText);
CPPUNIT_TEST_SUITE_END();
};
// Similar to getCharacterBaseWidth but this time from the top, for U+30E8 (it's straight at the top, not at the bottom).
static tools::Long getCharacterTopWidth(VirtualDevice* device, const Point& start)
{
Bitmap bitmap = device->GetBitmap(Point(), device->GetOutputSizePixel());
BitmapScopedReadAccess access(bitmap);
tools::Long y = start.Y();
while (y < bitmap.GetSizePixel().Height() && access->GetColor(y, start.X()) != COL_BLACK)
++y;
if (y >= bitmap.GetSizePixel().Height())
return -1;
tools::Long xmin = start.X();
while (xmin >= 0 && access->GetColor(y, xmin) != COL_WHITE)
--xmin;
tools::Long xmax = start.X();
while (xmax < bitmap.GetSizePixel().Width() && access->GetColor(y, xmax) != COL_WHITE)
++xmax;
return xmax - xmin + 1;
}
// The same, but from the right side, for U+30E8 (it's straight on the right side, not the left one).
static tools::Long getCharacterRightSideHeight(VirtualDevice* device, const Point& start)
{
Bitmap bitmap = device->GetBitmap(Point(), device->GetOutputSizePixel());
BitmapScopedReadAccess access(bitmap);
tools::Long x = start.X();
while (x >= 0 && !access->GetColor(start.Y(), x).IsDark())
--x;
if (x < 0)
return -1;
tools::Long ymin = start.Y();
while (ymin >= 0 && access->GetColor(ymin, x) != COL_WHITE)
--ymin;
tools::Long ymax = start.Y();
while (ymax < bitmap.GetSizePixel().Width() && access->GetColor(ymax, x) != COL_WHITE)
++ymax;
return ymax - ymin + 1;
}
// Like testSimpleText() but for a vertical character, here namely U+30E8 (katakana letter yo),
// chosen because it's a fairly simple shape (looks like horizontally mirrored E) that should
// have the right and top lines being straight. Well, and also chosen because I actually
// do not have much clue about CJK.
// IMPORTANT: If you modify this, modify also the void VclTextTest::testSimpleText().
void VclCjkTextTest::testVerticalText()
{
OUString text(u"\x30e8"_ustr);
ScopedVclPtr<VirtualDevice> device = VclPtr<VirtualDevice>::Create(DeviceFormat::WITHOUT_ALPHA);
device->SetOutputSizePixel(Size(100, 100));
device->SetBackground(Wallpaper(COL_WHITE));
// Disable AA, to make all pixels be black or white.
device->SetAntialiasing(AntialiasingFlags::DisableText);
// Bail out on all backends that do not work (or I didn't test). Opt-out rather than opt-in
// to make sure new backends fail initially.
if (device->GetGraphics()->getRenderBackendName() == "qt"
|| device->GetGraphics()->getRenderBackendName() == "qtsvp"
|| device->GetGraphics()->getRenderBackendName() == "gtk3svp"
|| device->GetGraphics()->getRenderBackendName() == "aqua"
|| device->GetGraphics()->getRenderBackendName() == "gen"
#ifdef MACOSX // vertical fonts are broken on Mac with or without Skia
|| device->GetGraphics()->getRenderBackendName() == "skia"
#endif
|| device->GetGraphics()->getRenderBackendName() == "genpsp")
return;
// We do not ship any CJK fonts, so try to find a common one that is usable for the test.
vcl::Font baseFont;
vcl::Font font;
bool fontFound = false;
for (const char* ptrfontName :
{ "Droid Sans Japanese", "Baekmuk Gulim", "Microsoft JhengHei", "Microsoft YaHei",
"MS PGothic", "Hiragino Sans", "Arial Unicode MS" })
{
OUString fontName = OUString::fromUtf8(ptrfontName);
if (!device->IsFontAvailable(fontName))
continue;
baseFont = vcl::Font(fontName, u"Book"_ustr, Size(0, 36));
baseFont.SetLanguage(LANGUAGE_JAPANESE);
baseFont.SetVertical(true);
baseFont.SetOrientation(2700_deg10);
if (device->HasGlyphs(baseFont, text) == -1) // -1 means no glyph is missing
{
fontFound = true;
break;
}
}
if (!fontFound)
{
SAL_WARN("vcl",
"Could not find a font for VclCjkTextTest::testVerticalText, skipping test.");
return;
}
font = baseFont;
font.SetFontSize(Size(0, 36));
device->Erase();
device->SetFont(font);
device->DrawText(Point(90, 10), text);
exportDevice(u"vertical-text-36.png"_ustr, device);
// Height of U+30E8 with font 36 size should be roughly 28 pixels,
// but since we don't know which font will be used, allow even more range.
tools::Long height36 = getCharacterRightSideHeight(device, Point(99, 22));
CPPUNIT_ASSERT_DOUBLES_EQUAL(tools::Long(28), height36, 6);
tools::Long width36 = getCharacterTopWidth(device, Point(65, 0));
CPPUNIT_ASSERT_DOUBLES_EQUAL(tools::Long(25), width36, 6);
// Horizontal writing of vertical glyphs. For some reason in this case
// the font is not set to be vertical.
font.SetOrientation(0_deg10);
font.SetVertical(false);
device->Erase();
device->SetFont(font);
device->DrawText(Point(10, 10), text);
exportDevice(u"vertical-text-36-0deg.png"_ustr, device);
// Here width and height should be the same, since the glyphs actually
// not rotated compared to the vertical writing.
tools::Long height36Rotated = getCharacterRightSideHeight(device, Point(99, 35));
CPPUNIT_ASSERT_DOUBLES_EQUAL(height36, height36Rotated, 1);
tools::Long width36Rotated = getCharacterTopWidth(device, Point(25, 0));
CPPUNIT_ASSERT_DOUBLES_EQUAL(width36, width36Rotated, 2);
font = baseFont;
font.SetFontSize(Size(0, 72));
device->Erase();
device->SetFont(font);
device->DrawText(Point(90, 10), text);
exportDevice(u"vertical-text-72.png"_ustr, device);
// Font size is doubled, so pixel sizes should also roughly double.
tools::Long height72 = getCharacterRightSideHeight(device, Point(99, 35));
CPPUNIT_ASSERT_DOUBLES_EQUAL(height36 * 2, height72, 4);
tools::Long width72 = getCharacterTopWidth(device, Point(40, 0));
CPPUNIT_ASSERT_DOUBLES_EQUAL(width36 * 2, width72, 4);
font.SetOrientation(0_deg10);
font.SetVertical(false);
device->Erase();
device->SetFont(font);
device->DrawText(Point(10, 10), text);
exportDevice(u"vertical-text-72-0deg.png"_ustr, device);
tools::Long height72Rotated = getCharacterRightSideHeight(device, Point(99, 60));
CPPUNIT_ASSERT_DOUBLES_EQUAL(height72, height72Rotated, 1);
tools::Long width72Rotated = getCharacterTopWidth(device, Point(45, 0));
CPPUNIT_ASSERT_DOUBLES_EQUAL(width72, width72Rotated, 1);
// On Windows scaling of vertical glyphs is broken.
if (device->GetGraphics()->getRenderBackendName() == "gdi")
return;
// Test width scaled to 200%.
font = baseFont;
font.SetFontSize(Size(72, 36));
#ifdef _WIN32
// TODO: What is the proper way to draw 200%-wide text? This is needed on Windows
// but it breaks Linux.
font.SetAverageFontWidth(2 * font.GetOrCalculateAverageFontWidth());
#endif
device->Erase();
device->SetFont(font);
device->DrawText(Point(90, 10), text);
// Double "width" with vertical text makes the height doubled.
exportDevice(u"vertical-text-36-200pct.png"_ustr, device);
tools::Long height36pct200 = getCharacterRightSideHeight(device, Point(99, 35));
CPPUNIT_ASSERT_DOUBLES_EQUAL(height36 * 2, height36pct200, 4);
tools::Long width36pct200 = getCharacterTopWidth(device, Point(65, 0));
CPPUNIT_ASSERT_DOUBLES_EQUAL(width36, width36pct200, 2);
// Test width scaled to 50%.
font = baseFont;
font.SetFontSize(Size(18, 36));
#ifdef _WIN32
font.SetAverageFontWidth(0.5 * font.GetOrCalculateAverageFontWidth());
#endif
device->Erase();
device->SetFont(font);
device->DrawText(Point(90, 10), text);
exportDevice(u"vertical-text-36-50pct.png"_ustr, device);
tools::Long height36pct50 = getCharacterRightSideHeight(device, Point(99, 16));
CPPUNIT_ASSERT_DOUBLES_EQUAL(height36 / 2, height36pct50, 2);
tools::Long width36pct50 = getCharacterTopWidth(device, Point(65, 0));
CPPUNIT_ASSERT_DOUBLES_EQUAL(width36, width36pct50, 2);
}
CPPUNIT_TEST_SUITE_REGISTRATION(VclCjkTextTest);
CPPUNIT_PLUGIN_IMPLEMENT();
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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