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authorArmin Le Grand (Allotropia) <armin.le.grand@me.com>2021-02-23 14:24:24 +0100
committerThorsten Behrens <thorsten.behrens@allotropia.de>2021-02-26 00:26:46 +0100
commit8b5922443654b8fc7354801c9ada17274f60eb8f (patch)
tree78818fedea89dba3b51e2547b26ff063bf941117
parent75d5db29f2ad2ff4f7944d47efc4ee001be7a1e7 (diff)
tdf#127471 Detect&Correct EMF/WMF with wrong FontScale
Before correcting our EMF/WMF export to write the Windows- specific data in the case of FontScaling, we wrote these files with wrong FontScaling. This change tries to detect and correct this at import, so that newer versions of the office on all plattforms can again load old, from us but not on Windows written EMF/WMF files. With this change we can read again all new and old EMF/WMF files (see table in task, comment 80). Change-Id: I1a0b0ab5f57c7cd40520401568af05cab4ecb4c8 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/111399 Tested-by: Jenkins Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com> (cherry picked from commit 3d33e4ce3987ea17e73a72e84f7f0df7af8101a6) Reviewed-on: https://gerrit.libreoffice.org/c/core/+/111452 Tested-by: Thorsten Behrens <thorsten.behrens@allotropia.de> Reviewed-by: Thorsten Behrens <thorsten.behrens@allotropia.de>
-rw-r--r--emfio/inc/mtftools.hxx24
-rw-r--r--emfio/source/reader/emfreader.cxx4
-rw-r--r--emfio/source/reader/mtftools.cxx211
-rw-r--r--emfio/source/reader/wmfreader.cxx3
-rw-r--r--include/vcl/metaact.hxx8
-rw-r--r--vcl/inc/impfont.hxx6
-rw-r--r--vcl/source/filter/wmf/emfwr.cxx2
-rw-r--r--vcl/source/font/font.cxx64
8 files changed, 286 insertions, 36 deletions
diff --git a/emfio/inc/mtftools.hxx b/emfio/inc/mtftools.hxx
index 736b1da2fe74..914235288a1d 100644
--- a/emfio/inc/mtftools.hxx
+++ b/emfio/inc/mtftools.hxx
@@ -27,6 +27,7 @@
#include <vcl/lineinfo.hxx>
#include <vcl/outdevstate.hxx>
#include <vcl/FilterConfigItem.hxx>
+#include <rtl/ref.hxx>
#include "emfiodllapi.h"
@@ -259,6 +260,8 @@ namespace emfio
#define HUNDREDTH_MILLIMETERS_PER_MILLIINCH 2.54
#define MILLIINCH_PER_TWIPS 1.44
+class MetaFontAction;
+
//============================ WmfReader ==================================
namespace emfio
@@ -455,6 +458,24 @@ namespace emfio
{}
};
+ // tdf#127471 implement detection and correction of wrongly scaled
+ // fonts in own-written, old (before this fix) EMF/WMF files
+ class ScaledFontDetectCorrectHelper
+ {
+ private:
+ rtl::Reference<MetaFontAction> maCurrentMetaFontAction;
+ std::vector<double> maAlternativeFontScales;
+ std::vector<std::pair<rtl::Reference<MetaFontAction>, double>> maPositiveIdentifiedCases;
+ std::vector<std::pair<rtl::Reference<MetaFontAction>, double>> maNegativeIdentifiedCases;
+
+ public:
+ ScaledFontDetectCorrectHelper();
+ void endCurrentMetaFontAction();
+ void newCurrentMetaFontAction(rtl::Reference<MetaFontAction>& rNewMetaFontAction);
+ void evaluateAlternativeFontScale(OUString const & rText, long nImportedTextLength);
+ void applyAlternativeFontScale();
+ };
+
class EMFIO_DLLPUBLIC MtfTools
{
MtfTools(MtfTools const &) = delete;
@@ -518,6 +539,9 @@ namespace emfio
sal_uInt32 mnEndPos;
std::vector<std::unique_ptr<BSaveStruct>> maBmpSaveList;
+ // tdf#127471 always try to detect - only used with ScaledText
+ ScaledFontDetectCorrectHelper maScaledFontHelper;
+
bool mbNopMode : 1;
bool mbFillStyleSelected : 1;
bool mbClipNeedsUpdate : 1;
diff --git a/emfio/source/reader/emfreader.cxx b/emfio/source/reader/emfreader.cxx
index 6a974085d887..d0e7eb31c696 100644
--- a/emfio/source/reader/emfreader.cxx
+++ b/emfio/source/reader/emfreader.cxx
@@ -1825,6 +1825,10 @@ namespace emfio
}
mpInputStream->Seek( nNextPos );
}
+
+ // tdf#127471
+ maScaledFontHelper.applyAlternativeFontScale();
+
if( !maBmpSaveList.empty() )
ResolveBitmapActions( maBmpSaveList );
diff --git a/emfio/source/reader/mtftools.cxx b/emfio/source/reader/mtftools.cxx
index 3053d3878e13..42f965ea3f56 100644
--- a/emfio/source/reader/mtftools.cxx
+++ b/emfio/source/reader/mtftools.cxx
@@ -318,6 +318,184 @@ namespace emfio
#endif
};
+ // tdf#127471
+ ScaledFontDetectCorrectHelper::ScaledFontDetectCorrectHelper()
+ : maCurrentMetaFontAction(),
+ maAlternativeFontScales(),
+ maPositiveIdentifiedCases(),
+ maNegativeIdentifiedCases()
+ {
+ }
+
+ void ScaledFontDetectCorrectHelper::endCurrentMetaFontAction()
+ {
+ if(maCurrentMetaFontAction.is() && !maAlternativeFontScales.empty())
+ {
+ // create average corrected FontScale value and count
+ // positive/negative hits
+ sal_uInt32 nPositive(0);
+ sal_uInt32 nNegative(0);
+ double fAverage(0.0);
+
+ for(double fPart : maAlternativeFontScales)
+ {
+ if(fPart < 0.0)
+ {
+ nNegative++;
+ fAverage += -fPart;
+ }
+ else
+ {
+ nPositive++;
+ fAverage += fPart;
+ }
+ }
+
+ fAverage /= static_cast<double>(maAlternativeFontScales.size());
+
+ if(nPositive >= nNegative)
+ {
+ // correction intended, it is probably an old imported file
+ maPositiveIdentifiedCases.push_back(std::pair<rtl::Reference<MetaFontAction>, double>(maCurrentMetaFontAction, fAverage));
+ }
+ else
+ {
+ // correction not favorable in the majority of cases for this Font, still
+ // remember to have a weight in the last decision for correction
+ maNegativeIdentifiedCases.push_back(std::pair<rtl::Reference<MetaFontAction>, double>(maCurrentMetaFontAction, fAverage));
+ }
+ }
+
+ maCurrentMetaFontAction.clear();
+ maAlternativeFontScales.clear();
+ }
+
+ void ScaledFontDetectCorrectHelper::newCurrentMetaFontAction(rtl::Reference<MetaFontAction>& rNewMetaFontAction)
+ {
+ maCurrentMetaFontAction.clear();
+ maAlternativeFontScales.clear();
+
+ if(rNewMetaFontAction.is())
+ {
+ // check 1st criteria for FontScale active. We usually write this,
+ // so this will already sort out most situations
+ const vcl::Font& rCandidate(rNewMetaFontAction->GetFont());
+
+ if(0 != rCandidate.GetAverageFontWidth())
+ {
+ const long nUnscaledAverageFontWidth(rCandidate.GetOrCalculateAverageFontWidth());
+
+ // check 2nd (system-dependent) criteria for FontScale
+ if(nUnscaledAverageFontWidth != rCandidate.GetFontHeight())
+ {
+ // FontScale is active, remrmber and use as current
+ maCurrentMetaFontAction = rNewMetaFontAction;
+ }
+ }
+ }
+ }
+
+ void ScaledFontDetectCorrectHelper::evaluateAlternativeFontScale(OUString const & rText, long nImportedTextLength)
+ {
+ if(maCurrentMetaFontAction.is())
+ {
+ SolarMutexGuard aGuard; // VirtualDevice is not thread-safe
+ ScopedVclPtrInstance< VirtualDevice > pTempVirtualDevice;
+
+ // calculate measured TextLength
+ const vcl::Font& rFontCandidate(maCurrentMetaFontAction->GetFont());
+ pTempVirtualDevice->SetFont(rFontCandidate);
+ const long nMeasuredTextLength(pTempVirtualDevice->GetTextWidth(rText));
+
+ // compare expected and imported TextLengths
+ if(nImportedTextLength != nMeasuredTextLength)
+ {
+ const double fFactorText(static_cast<double>(nImportedTextLength) / static_cast<double>(nMeasuredTextLength));
+ const double fFactorTextPercent(fabs(1.0 - fFactorText) * 100.0);
+
+ // if we assume that loaded file was written on old linux, we have to
+ // back-convert the scale value depending on which system we run
+#ifdef _WIN32
+ // When running on Windows the value was not adapted at font import (see WinMtfFontStyle
+ // constructor), so it is still NormedFontScaling and we need to convert to Windows-style
+ // scaling
+#else
+ // When running on unx (non-Windows) the value was already adapted at font import (see WinMtfFontStyle
+ // constructor). It was wrongly assumed to be Windows-style FontScaling, so we need to revert that
+ // to get back to the needed unx-style FontScale
+#endif
+ // Interestingly this leads to the *same* correction, so no need to make this
+ // system-dependent (!)
+ const long nUnscaledAverageFontWidth(rFontCandidate.GetOrCalculateAverageFontWidth());
+ const long nScaledAverageFontWidth(rFontCandidate.GetAverageFontWidth());
+ const double fScaleFactor(static_cast<double>(nUnscaledAverageFontWidth) / static_cast<double>(rFontCandidate.GetFontHeight()));
+ const double fCorrectedAverageFontWidth(static_cast<double>(nScaledAverageFontWidth) * fScaleFactor);
+ long nCorrectedTextLength(0);
+
+ { // do in own scope, only need nUnscaledAverageFontWidth
+ vcl::Font rFontCandidate2(rFontCandidate);
+ rFontCandidate2.SetAverageFontWidth(static_cast<long>(fCorrectedAverageFontWidth));
+ pTempVirtualDevice->SetFont(rFontCandidate2);
+ nCorrectedTextLength = pTempVirtualDevice->GetTextWidth(rText);
+ }
+
+ const double fFactorCorrectedText(static_cast<double>(nImportedTextLength) / static_cast<double>(nCorrectedTextLength));
+ const double fFactorCorrectedTextPercent(fabs(1.0 - fFactorCorrectedText) * 100.0);
+
+ // If FactorCorrectedText fits better than FactorText this is probably
+ // an import of an old EMF/WMF written by LibreOffice on a non-Windows (unx) system
+ // and should be corrected.
+ // Usually in tested cases this lies inside 5% of range, so detecting this just using
+ // fFactorTextPercent indside 5% -> no old file
+ // fFactorCorrectedTextPercent indside 5% -> is old file
+ // works not too bad, but there are some strange not so often used fonts where that
+ // values do deviate, so better just compare if old corrected would fit better than
+ // the uncorrected case, that is usually safe.
+ if(fFactorCorrectedTextPercent < fFactorTextPercent)
+ {
+ maAlternativeFontScales.push_back(fCorrectedAverageFontWidth);
+ }
+ else
+ {
+ // also push, but negative to remember non-fitting case
+ maAlternativeFontScales.push_back(-fCorrectedAverageFontWidth);
+ }
+ }
+ }
+ }
+
+ void ScaledFontDetectCorrectHelper::applyAlternativeFontScale()
+ {
+ // make sure last evtl. detected current FontAction gets added to identified cases
+ endCurrentMetaFontAction();
+
+ // Take final decision to correct FontScaling for this imported Metafile or not.
+ // It is possible to weight positive against negative cases, so to only finally
+ // correct when more positive cases were detected.
+ // But that would be inconsequent and wrong. *If* the detected case is an old import
+ // the whole file was written with wrong FontScale values and all Font actions
+ // need to be corrected. Thus, for now, correct all when there are/is positive
+ // cases detected.
+ // On the other hand it *may* be that for some strange fonts there is a false-positive
+ // in the positive cases, so at least insist on positive cases being more than negative.
+ // Still, do then correct *all* cases.
+ if(!maPositiveIdentifiedCases.empty()
+ && maPositiveIdentifiedCases.size() >= maNegativeIdentifiedCases.size())
+ {
+ for(std::pair<rtl::Reference<MetaFontAction>, double>& rCandidate : maPositiveIdentifiedCases)
+ {
+ rCandidate.first->correctFontScale(static_cast<long>(rCandidate.second));
+ }
+ for(std::pair<rtl::Reference<MetaFontAction>, double>& rCandidate : maNegativeIdentifiedCases)
+ {
+ rCandidate.first->correctFontScale(static_cast<long>(rCandidate.second));
+ }
+ }
+
+ maPositiveIdentifiedCases.clear();
+ maNegativeIdentifiedCases.clear();
+ }
+
Color MtfTools::ReadColor()
{
sal_uInt32 nColor;
@@ -906,6 +1084,7 @@ namespace emfio
mnStartPos(0),
mnEndPos(0),
maBmpSaveList(),
+ maScaledFontHelper(),
mbNopMode(false),
mbFillStyleSelected(false),
mbClipNeedsUpdate(true),
@@ -1597,14 +1776,29 @@ namespace emfio
maActPos = rPosition + aActPosDelta;
}
}
- if ( bChangeFont || ( maLatestFont != aTmp ) )
+
+ if(bChangeFont || (maLatestFont != aTmp))
{
maLatestFont = aTmp;
- mpGDIMetaFile->AddAction( new MetaFontAction( aTmp ) );
+ rtl::Reference<MetaFontAction> aNewMetaFontAction(new MetaFontAction(aTmp));
+
+ // tdf#127471 end evtl active MetaFontAction scale corrector detector/collector
+ maScaledFontHelper.endCurrentMetaFontAction();
+
+ // !bRecordPath: else no MetaTextArrayAction will be created
+ // nullptr != pDXArry: detection only possible when text size is given
+ // rText.getLength(): no useful check without text
+ if(!bRecordPath && nullptr != pDXArry && 0 != rText.getLength())
+ {
+ maScaledFontHelper.newCurrentMetaFontAction(aNewMetaFontAction);
+ }
+
+ mpGDIMetaFile->AddAction( rtl::Reference<MetaAction>( aNewMetaFontAction.get() ) );
mpGDIMetaFile->AddAction( new MetaTextAlignAction( aTmp.GetAlignment() ) );
mpGDIMetaFile->AddAction( new MetaTextColorAction( aTmp.GetColor() ) );
mpGDIMetaFile->AddAction( new MetaTextFillColorAction( aTmp.GetFillColor(), !aTmp.IsTransparent() ) );
}
+
if ( bRecordPath )
{
// TODO
@@ -1625,7 +1819,18 @@ namespace emfio
/* because text without dx array is badly scaled, we
will create such an array if necessary */
long* pDX = pDXArry;
- if (!pDXArry)
+ if (pDXArry)
+ {
+ // only useful when we have an imported DXArray
+ if(!rText.isEmpty())
+ {
+ maScaledFontHelper.evaluateAlternativeFontScale(
+ rText,
+ pDXArry[rText.getLength() - 1] // extract imported TextLength
+ );
+ }
+ }
+ else
{
// #i117968# VirtualDevice is not thread safe, but filter is used in multithreading
SolarMutexGuard aGuard;
diff --git a/emfio/source/reader/wmfreader.cxx b/emfio/source/reader/wmfreader.cxx
index 58c4d971cb49..74b399282787 100644
--- a/emfio/source/reader/wmfreader.cxx
+++ b/emfio/source/reader/wmfreader.cxx
@@ -1228,6 +1228,9 @@ namespace emfio
case W_META_ENDDOC:
break;
}
+
+ // tdf#127471
+ maScaledFontHelper.applyAlternativeFontScale();
}
static const long aMaxWidth = 1024;
diff --git a/include/vcl/metaact.hxx b/include/vcl/metaact.hxx
index 2666edb5f334..febbadb992a2 100644
--- a/include/vcl/metaact.hxx
+++ b/include/vcl/metaact.hxx
@@ -1399,12 +1399,20 @@ public:
const MapMode& GetMapMode() const { return maMapMode; }
};
+// tdf#127471 decl for friend below
+namespace emfio { class ScaledFontDetectCorrectHelper; }
+
class VCL_DLLPUBLIC MetaFontAction final : public MetaAction
{
private:
vcl::Font maFont;
+ // tdf#127471 for import correction of own wrong written EMF/WMF files allow correction
+ // of FontScale after import. Only from there, so use a friend here and keep the method private
+ friend class emfio::ScaledFontDetectCorrectHelper;
+ void correctFontScale(long nNewFontScale) { maFont.SetAverageFontWidth(nNewFontScale); }
+
public:
MetaFontAction();
MetaFontAction(MetaFontAction const &) = default;
diff --git a/vcl/inc/impfont.hxx b/vcl/inc/impfont.hxx
index 624707839f40..c96a6bab8c59 100644
--- a/vcl/inc/impfont.hxx
+++ b/vcl/inc/impfont.hxx
@@ -64,14 +64,12 @@ public:
void SetCharSet( const rtl_TextEncoding eCharSet ) { meCharSet = eCharSet; }
void SetFontSize( const Size& rSize )
{
-#ifndef _WIN32
if(rSize.Height() != maAverageFontSize.Height())
{
// reset evtl. buffered calculated AverageFontSize, it depends
// on Font::Height
mnCalculatedAverageFontWidth = 0;
}
-#endif
maAverageFontSize = rSize;
}
@@ -91,10 +89,8 @@ public:
void IncreaseQualityBy( int nQualityAmount ) { mnQuality += nQualityAmount; }
void DecreaseQualityBy( int nQualityAmount ) { mnQuality -= nQualityAmount; }
-#ifndef _WIN32
long GetCalculatedAverageFontWidth() const { return mnCalculatedAverageFontWidth; }
void SetCalculatedAverageFontWidth(long nNew) { mnCalculatedAverageFontWidth = nNew; }
-#endif
bool operator==( const ImplFont& ) const;
@@ -146,9 +142,7 @@ private:
int mnQuality;
-#ifndef _WIN32
long mnCalculatedAverageFontWidth;
-#endif
};
#endif // INCLUDED_VCL_INC_IMPFONT_HXX
diff --git a/vcl/source/filter/wmf/emfwr.cxx b/vcl/source/filter/wmf/emfwr.cxx
index 58f0e550a9ae..514ce8ef9e8a 100644
--- a/vcl/source/filter/wmf/emfwr.cxx
+++ b/vcl/source/filter/wmf/emfwr.cxx
@@ -474,7 +474,7 @@ void EMFWriter::ImplCheckTextAttr()
// specific formats.
const long nAverageFontWidth(rFont.GetOrCalculateAverageFontWidth());
- if(nAverageFontWidth > 0)
+ if(nFontHeight > 0)
{
const double fScaleFactor(static_cast<double>(nAverageFontWidth) / static_cast<double>(nFontHeight));
nFontWidth = static_cast<long>(static_cast<double>(nFontWidth) * fScaleFactor);
diff --git a/vcl/source/font/font.cxx b/vcl/source/font/font.cxx
index 2ac9a032bb30..64f16b08f8db 100644
--- a/vcl/source/font/font.cxx
+++ b/vcl/source/font/font.cxx
@@ -33,6 +33,7 @@
#include <rtl/instance.hxx>
#include <TypeSerializer.hxx>
+#include <vcl/svapp.hxx>
#ifdef _WIN32
#include <vcl/metric.hxx>
@@ -366,34 +367,49 @@ void Font::GetFontAttributes( FontAttributes& rAttrs ) const
// tdf#127471 for corrections on EMF/WMF we need the AvgFontWidth in Windows-specific notation
long Font::GetOrCalculateAverageFontWidth() const
{
-#ifdef _WIN32
- // on windows we just have it available
- return GetAverageFontWidth();
-#else
- // On non-Windows systems we need to calculate AvgFontWidth
- // as close as possible (discussion see documentation in task)
if(0 == mpImplFont->GetCalculatedAverageFontWidth())
{
- // calculate it. For discussion of method used, see task
- const std::size_t nSize(127 - 32);
- std::array<sal_Unicode, nSize> aArray;
+ // VirtualDevice is not thread safe
+ SolarMutexGuard aGuard;
+
+ // create unscaled copy of font (this), a VirtualDevice and set it there
+ vcl::Font aUnscaledFont(*this);
+ ScopedVclPtr<VirtualDevice> pTempVirtualDevice(VclPtr<VirtualDevice>::Create());
+ aUnscaledFont.SetAverageFontWidth(0);
+ pTempVirtualDevice->SetFont(aUnscaledFont);
- for(sal_Unicode a(0); a < nSize; a++)
+#ifdef _WIN32
+ // on Windows systems use FontMetric to get/create AverageFontWidth from system
+ const FontMetric aMetric(pTempVirtualDevice->GetFontMetric());
+ const_cast<Font*>(this)->mpImplFont->SetCalculatedAverageFontWidth(aMetric.GetAverageFontWidth());
+#else
+ // On non-Windows systems we need to calculate AvgFontWidth
+ // as close as possible (discussion see documentation in task),
+ // so calculate it. For discussion of method used, see task
+ // buffer measure string creation, will always use the same
+ static OUString aMeasureString;
+
+ if(!aMeasureString.getLength())
{
- aArray[a] = a + 32;
+ const std::size_t nSize(127 - 32);
+ std::array<sal_Unicode, nSize> aArray;
+
+ for(sal_Unicode a(0); a < nSize; a++)
+ {
+ aArray[a] = a + 32;
+ }
+
+ aMeasureString = OUString(aArray.data(), nSize);
}
- vcl::Font aUnscaledFont(*this);
- ScopedVclPtr<VirtualDevice> pVirDev(VclPtr<VirtualDevice>::Create());
- aUnscaledFont.SetAverageFontWidth(0);
- pVirDev->SetFont(aUnscaledFont);
const double fAverageFontWidth(
- pVirDev->GetTextWidth(OUString(aArray.data())) / static_cast<double>(nSize));
+ pTempVirtualDevice->GetTextWidth(aMeasureString, 0, aMeasureString.getLength()) /
+ static_cast<double>(aMeasureString.getLength()));
const_cast<Font*>(this)->mpImplFont->SetCalculatedAverageFontWidth(basegfx::fround(fAverageFontWidth));
+#endif
}
return mpImplFont->GetCalculatedAverageFontWidth();
-#endif
}
SvStream& ReadImplFont( SvStream& rIStm, ImplFont& rImplFont, long& rnNormedFontScaling )
@@ -517,7 +533,7 @@ SvStream& ReadFont( SvStream& rIStm, vcl::Font& rFont )
aUnscaledFont.SetAverageFontWidth(0);
const FontMetric aUnscaledFontMetric(Application::GetDefaultDevice()->GetFontMetric(aUnscaledFont));
- if (aUnscaledFontMetric.GetAverageFontWidth() > 0)
+ if (nHeight > 0)
{
const double fScaleFactor(static_cast<double>(nNormedFontScaling) / static_cast<double>(nHeight));
nScaledWidth = basegfx::fround(static_cast<double>(aUnscaledFontMetric.GetAverageFontWidth()) * fScaleFactor);
@@ -881,10 +897,8 @@ ImplFont::ImplFont() :
maFillColor( COL_TRANSPARENT ),
mbWordLine( false ),
mnOrientation( 0 ),
- mnQuality( 0 )
-#ifndef _WIN32
- , mnCalculatedAverageFontWidth(0)
-#endif
+ mnQuality( 0 ),
+ mnCalculatedAverageFontWidth( 0 )
{}
ImplFont::ImplFont( const ImplFont& rImplFont ) :
@@ -916,10 +930,8 @@ ImplFont::ImplFont( const ImplFont& rImplFont ) :
maFillColor( rImplFont.maFillColor ),
mbWordLine( rImplFont.mbWordLine ),
mnOrientation( rImplFont.mnOrientation ),
- mnQuality( rImplFont.mnQuality )
-#ifndef _WIN32
- , mnCalculatedAverageFontWidth(rImplFont.mnCalculatedAverageFontWidth)
-#endif
+ mnQuality( rImplFont.mnQuality ),
+ mnCalculatedAverageFontWidth( rImplFont.mnCalculatedAverageFontWidth )
{}
bool ImplFont::operator==( const ImplFont& rOther ) const