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authorArmin.Le.Grand (CIB) <Armin.Le.Grand@me.com>2020-03-03 11:34:45 +0100
committerThorsten Behrens <Thorsten.Behrens@CIB.de>2020-03-04 19:19:05 +0100
commit05b7e773e4c0d1a210ebb19b8f0da07a026c6417 (patch)
tree92a67cdf4ab7365eb14aac15acda71230bf4dbc9
parentf13df6132e3b7a16de251bbe2f09b0baca19b58d (diff)
tdf#130150 Improve clipping in PDF export
For more info and discusson please have a look at the task. It reverts the change from tdf#99680 which did a wrong paradigm change in how clip in Region(s) is defined and tries to fix the underlying error in a more correct way. This includes problems noted in tdf#44388 and tdf#113449. This is a decent improvement, but - due to dealing with numerical problems - not yet the whole healing. Still thinking about how to solve this for good. Adapted PdfExportTest::testTdf99680() and PdfExportTest::testTdf99680_2() as needed, empty clip regions are allowed again. Added comments, too. Had to change solvePolygonOperationAnd to work on ranges if both inputs *are* ranges. The AND-case is then completely solvable. Also increased geometry for transformations of clip geometries - may help later. Reviewed-on: https://gerrit.libreoffice.org/c/core/+/89874 Tested-by: Jenkins Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de> Conflicts: vcl/source/gdi/pdfwriter_impl.cxx Change-Id: I2370447597faa6efb81d58ee31c63654e304262e
-rw-r--r--basegfx/source/polygon/b2dpolygontools.cxx15
-rw-r--r--basegfx/source/polygon/b2dpolypolygoncutter.cxx36
-rw-r--r--vcl/qa/cppunit/pdfexport/pdfexport.cxx28
-rw-r--r--vcl/source/gdi/pdfwriter_impl.cxx56
4 files changed, 102 insertions, 33 deletions
diff --git a/basegfx/source/polygon/b2dpolygontools.cxx b/basegfx/source/polygon/b2dpolygontools.cxx
index db3365eee313..766a7cd4d361 100644
--- a/basegfx/source/polygon/b2dpolygontools.cxx
+++ b/basegfx/source/polygon/b2dpolygontools.cxx
@@ -343,15 +343,15 @@ namespace basegfx
const B2DPoint aPreviousPoint(aCurrentPoint);
aCurrentPoint = aCandidate.getB2DPoint(a);
- // cross-over in Y?
- const bool bCompYA(fTools::more(aPreviousPoint.getY(), rPoint.getY()));
- const bool bCompYB(fTools::more(aCurrentPoint.getY(), rPoint.getY()));
+ // cross-over in Y? tdf#130150 use full precision, no need for epsilon
+ const bool bCompYA(aPreviousPoint.getY() > rPoint.getY());
+ const bool bCompYB(aCurrentPoint.getY() > rPoint.getY());
if(bCompYA != bCompYB)
{
- // cross-over in X?
- const bool bCompXA(fTools::more(aPreviousPoint.getX(), rPoint.getX()));
- const bool bCompXB(fTools::more(aCurrentPoint.getX(), rPoint.getX()));
+ // cross-over in X? tdf#130150 use full precision, no need for epsilon
+ const bool bCompXA(aPreviousPoint.getX() > rPoint.getX());
+ const bool bCompXB(aCurrentPoint.getX() > rPoint.getX());
if(bCompXA == bCompXB)
{
@@ -367,7 +367,8 @@ namespace basegfx
(aPreviousPoint.getX() - aCurrentPoint.getX()) /
(aPreviousPoint.getY() - aCurrentPoint.getY()));
- if(fTools::more(fCompare, rPoint.getX()))
+ // tdf#130150 use full precision, no need for epsilon
+ if(fCompare > rPoint.getX())
{
bRetval = !bRetval;
}
diff --git a/basegfx/source/polygon/b2dpolypolygoncutter.cxx b/basegfx/source/polygon/b2dpolypolygoncutter.cxx
index 4fd7bf369d85..1d2b3efb7363 100644
--- a/basegfx/source/polygon/b2dpolypolygoncutter.cxx
+++ b/basegfx/source/polygon/b2dpolypolygoncutter.cxx
@@ -986,6 +986,42 @@ namespace basegfx
}
else
{
+ // tdf#130150 shortcut & precision: If both are simple ranges,
+ // solve based on ranges
+ if(basegfx::utils::isRectangle(rCandidateA) && basegfx::utils::isRectangle(rCandidateB))
+ {
+ // *if* both are ranges, AND always can be solved
+ const basegfx::B2DRange aRangeA(rCandidateA.getB2DRange());
+ const basegfx::B2DRange aRangeB(rCandidateB.getB2DRange());
+
+ if(aRangeA.isInside(aRangeB))
+ {
+ // 2nd completely inside 1st -> 2nd is result of AND
+ return rCandidateB;
+ }
+
+ if(aRangeB.isInside(aRangeA))
+ {
+ // 2nd completely inside 1st -> 2nd is result of AND
+ return rCandidateA;
+ }
+
+ // solve by intersection
+ basegfx::B2DRange aIntersect(aRangeA);
+ aIntersect.intersect(aRangeB);
+
+ if(aIntersect.isEmpty())
+ {
+ // no overlap -> empty polygon as result of AND
+ return B2DPolyPolygon();
+ }
+
+ // create polygon result
+ return B2DPolyPolygon(
+ basegfx::utils::createPolygonFromRect(
+ aIntersect));
+ }
+
// concatenate polygons, solve crossovers and throw away all sub-polygons
// with a depth of < 1. This means to keep all polygons where at least two
// polygons do overlap.
diff --git a/vcl/qa/cppunit/pdfexport/pdfexport.cxx b/vcl/qa/cppunit/pdfexport/pdfexport.cxx
index 5c4b4a8c7141..57c6e8b1445c 100644
--- a/vcl/qa/cppunit/pdfexport/pdfexport.cxx
+++ b/vcl/qa/cppunit/pdfexport/pdfexport.cxx
@@ -714,15 +714,17 @@ void PdfExportTest::testTdf99680()
aZCodec.Decompress(rObjectStream, aUncompressed);
CPPUNIT_ASSERT(aZCodec.EndCompression());
- // Make sure there are no empty clipping regions.
- OString aEmptyRegion("0 0 m h W* n");
- auto pStart = static_cast<const char*>(aUncompressed.GetData());
- const char* pEnd = pStart + aUncompressed.GetSize();
- auto it = std::search(pStart, pEnd, aEmptyRegion.getStr(), aEmptyRegion.getStr() + aEmptyRegion.getLength());
- CPPUNIT_ASSERT_EQUAL_MESSAGE("Empty clipping region detected!", it, pEnd);
+ // tdf#130150 See infos in task - short: tdf#99680 was not the
+ // correct fix, so empty clip regions are valid - allow again in tests
+ // Make sure there are no empty clipping regions.
+ // OString aEmptyRegion("0 0 m h W* n");
+ // auto it = std::search(pStart, pEnd, aEmptyRegion.getStr(), aEmptyRegion.getStr() + aEmptyRegion.getLength());
+ // CPPUNIT_ASSERT_EQUAL_MESSAGE("Empty clipping region detected!", it, pEnd);
// Count save graphic state (q) and restore (Q) operators
// and ensure their amount is equal
+ auto pStart = static_cast<const char*>(aUncompressed.GetData());
+ const char* pEnd = pStart + aUncompressed.GetSize();
size_t nSaveCount = std::count(pStart, pEnd, 'q');
size_t nRestoreCount = std::count(pStart, pEnd, 'Q');
CPPUNIT_ASSERT_EQUAL_MESSAGE("Save/restore graphic state operators count mismatch!", nSaveCount, nRestoreCount);
@@ -753,15 +755,17 @@ void PdfExportTest::testTdf99680_2()
aZCodec.Decompress(rObjectStream, aUncompressed);
CPPUNIT_ASSERT(aZCodec.EndCompression());
- // Make sure there are no empty clipping regions.
- OString aEmptyRegion("0 0 m h W* n");
- auto pStart = static_cast<const char*>(aUncompressed.GetData());
- const char* pEnd = pStart + aUncompressed.GetSize();
- auto it = std::search(pStart, pEnd, aEmptyRegion.getStr(), aEmptyRegion.getStr() + aEmptyRegion.getLength());
- CPPUNIT_ASSERT_EQUAL_MESSAGE("Empty clipping region detected!", it, pEnd);
+ // tdf#130150 See infos in task - short: tdf#99680 was not the
+ // correct fix, so empty clip regions are valid - allow again in tests
+ // Make sure there are no empty clipping regions.
+ // OString aEmptyRegion("0 0 m h W* n");
+ // auto it = std::search(pStart, pEnd, aEmptyRegion.getStr(), aEmptyRegion.getStr() + aEmptyRegion.getLength());
+ // CPPUNIT_ASSERT_EQUAL_MESSAGE("Empty clipping region detected!", it, pEnd);
// Count save graphic state (q) and restore (Q) operators
// and ensure their amount is equal
+ auto pStart = static_cast<const char*>(aUncompressed.GetData());
+ const char* pEnd = pStart + aUncompressed.GetSize();
size_t nSaveCount = std::count(pStart, pEnd, 'q');
size_t nRestoreCount = std::count(pStart, pEnd, 'Q');
CPPUNIT_ASSERT_EQUAL_MESSAGE("Save/restore graphic state operators count mismatch!", nSaveCount, nRestoreCount);
diff --git a/vcl/source/gdi/pdfwriter_impl.cxx b/vcl/source/gdi/pdfwriter_impl.cxx
index a14f64d54ed5..3e538cc2fec7 100644
--- a/vcl/source/gdi/pdfwriter_impl.cxx
+++ b/vcl/source/gdi/pdfwriter_impl.cxx
@@ -10318,8 +10318,15 @@ void PDFWriterImpl::updateGraphicsState(Mode const mode)
if ( rNewState.m_aClipRegion.count() )
{
m_aPages.back().appendPolyPolygon( rNewState.m_aClipRegion, aLine );
- aLine.append( "W* n\n" );
}
+ else
+ {
+ // tdf#130150 Need to revert tdf#99680, that breaks the
+ // rule that an set but empty clip-region clips everything
+ // aka draws nothing -> nothing is in an empty clip-region
+ aLine.append( "0 0 m h " ); // NULL clip, i.e. nothing visible
+ }
+ aLine.append( "W* n\n" );
rNewState.m_aMapMode = aNewMapMode;
getReferenceDevice()->SetMapMode( rNewState.m_aMapMode );
@@ -10465,8 +10472,13 @@ void PDFWriterImpl::setMapMode( const MapMode& rMapMode )
void PDFWriterImpl::setClipRegion( const basegfx::B2DPolyPolygon& rRegion )
{
- basegfx::B2DPolyPolygon aRegion = getReferenceDevice()->LogicToPixel( rRegion, m_aGraphicsStack.front().m_aMapMode );
- aRegion = getReferenceDevice()->PixelToLogic( aRegion, m_aMapMode );
+ // tdf#130150 improve coordinate manipulations to double precision transformations
+ const basegfx::B2DHomMatrix aCurrentTransform(
+ getReferenceDevice()->GetInverseViewTransformation(m_aMapMode) *
+ getReferenceDevice()->GetViewTransformation(m_aGraphicsStack.front().m_aMapMode));
+ basegfx::B2DPolyPolygon aRegion(rRegion);
+
+ aRegion.transform(aCurrentTransform);
m_aGraphicsStack.front().m_aClipRegion = aRegion;
m_aGraphicsStack.front().m_bClipRegion = true;
m_aGraphicsStack.front().m_nUpdateFlags |= GraphicsStateUpdateFlags::ClipRegion;
@@ -10476,16 +10488,26 @@ void PDFWriterImpl::moveClipRegion( sal_Int32 nX, sal_Int32 nY )
{
if( m_aGraphicsStack.front().m_bClipRegion && m_aGraphicsStack.front().m_aClipRegion.count() )
{
- Point aPoint( lcl_convert( m_aGraphicsStack.front().m_aMapMode,
- m_aMapMode,
- getReferenceDevice(),
- Point( nX, nY ) ) );
- aPoint -= lcl_convert( m_aGraphicsStack.front().m_aMapMode,
- m_aMapMode,
- getReferenceDevice(),
- Point() );
+ // tdf#130150 improve coordinate manipulations to double precision transformations
+ basegfx::B2DHomMatrix aConvertA;
+
+ if(MapUnit::MapPixel == m_aGraphicsStack.front().m_aMapMode.GetMapUnit())
+ {
+ aConvertA = getReferenceDevice()->GetInverseViewTransformation(m_aMapMode);
+ }
+ else
+ {
+ aConvertA = getReferenceDevice()->LogicToLogic(m_aGraphicsStack.front().m_aMapMode, m_aMapMode);
+ }
+
+ basegfx::B2DPoint aB2DPointA(nX, nY);
+ basegfx::B2DPoint aB2DPointB(0.0, 0.0);
+ aB2DPointA *= aConvertA;
+ aB2DPointB *= aConvertA;
+ aB2DPointA -= aB2DPointB;
basegfx::B2DHomMatrix aMat;
- aMat.translate( aPoint.X(), aPoint.Y() );
+
+ aMat.translate(aB2DPointA.getX(), aB2DPointA.getY());
m_aGraphicsStack.front().m_aClipRegion.transform( aMat );
m_aGraphicsStack.front().m_nUpdateFlags |= GraphicsStateUpdateFlags::ClipRegion;
}
@@ -10500,9 +10522,15 @@ void PDFWriterImpl::intersectClipRegion( const tools::Rectangle& rRect )
void PDFWriterImpl::intersectClipRegion( const basegfx::B2DPolyPolygon& rRegion )
{
- basegfx::B2DPolyPolygon aRegion( getReferenceDevice()->LogicToPixel( rRegion, m_aGraphicsStack.front().m_aMapMode ) );
- aRegion = getReferenceDevice()->PixelToLogic( aRegion, m_aMapMode );
+ // tdf#130150 improve coordinate manipulations to double precision transformations
+ const basegfx::B2DHomMatrix aCurrentTransform(
+ getReferenceDevice()->GetInverseViewTransformation(m_aMapMode) *
+ getReferenceDevice()->GetViewTransformation(m_aGraphicsStack.front().m_aMapMode));
+ basegfx::B2DPolyPolygon aRegion(rRegion);
+
+ aRegion.transform(aCurrentTransform);
m_aGraphicsStack.front().m_nUpdateFlags |= GraphicsStateUpdateFlags::ClipRegion;
+
if( m_aGraphicsStack.front().m_bClipRegion )
{
basegfx::B2DPolyPolygon aOld( basegfx::utils::prepareForPolygonOperation( m_aGraphicsStack.front().m_aClipRegion ) );