lok: render image preview with lower resolution

renderShapeSelection callback is used to render
image previews which are later used during
eg. rotation.

Do not render preview with original size which
slows down app a lot. Use 1280x720 max.

Change-Id: Ia8365a67d87cea869ef74cb70ce4830439a523b6
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/129376
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/129497
Tested-by: Jenkins
Reviewed-by: Szymon Kłos <szymon.klos@collabora.com>

11 files changed, 96 insertions, 26 deletions

diff --git a/desktop/source/lib/init.cxx b/desktop/source/lib/init.cxx
index 719013274be3..91a4d80ca128 100644
--- a/desktop/source/lib/init.cxx
+++ b/desktop/source/lib/init.cxx
@@ -3960,6 +3960,7 @@ static size_t doc_renderShapeSelection(LibreOfficeKitDocument* pThis, char** pOu
         }
         aMediaDescriptor["SelectionOnly"] <<= true;
         aMediaDescriptor["OutputStream"] <<= xOut;
+        aMediaDescriptor["IsPreview"] <<= true; // will down-scale graphics
 
         xStorable->storeToURL("private:stream", aMediaDescriptor.getAsConstPropertyValueList());
 
diff --git a/filter/source/svg/svgexport.cxx b/filter/source/svg/svgexport.cxx
index 260de5b56d17..cd8675877e49 100644
--- a/filter/source/svg/svgexport.cxx
+++ b/filter/source/svg/svgexport.cxx
@@ -798,7 +798,9 @@ bool SVGFilter::implExportWriterTextGraphic( const Reference< view::XSelectionSu
         const Graphic aOriginalGraphic(xOriginalGraphic);
 
         uno::Reference<graphic::XGraphic> xTransformedGraphic;
-        xPropertySet->getPropertyValue("TransformedGraphic") >>= xTransformedGraphic;
+        xPropertySet->getPropertyValue(
+            mbIsPreview ? OUString("GraphicPreview") : OUString("TransformedGraphic"))
+                >>= xTransformedGraphic;
 
         if (!xTransformedGraphic.is())
             return false;
@@ -974,6 +976,8 @@ bool SVGFilter::implExportDocument()
                 mpSVGWriter->SetEmbeddedBitmapRefs( &maBitmapActionMap );
                 implExportTiledBackground();
             }
+            if( mbIsPreview )
+                mpSVGWriter->SetPreviewMode();
 
             // #i124608# export a given object selection, so no MasterPage export at all
             if (!mbExportShapeSelection)
diff --git a/filter/source/svg/svgfilter.cxx b/filter/source/svg/svgfilter.cxx
index 359bd34e3dd8..db5488064712 100644
--- a/filter/source/svg/svgfilter.cxx
+++ b/filter/source/svg/svgfilter.cxx
@@ -76,6 +76,7 @@ SVGFilter::SVGFilter( const Reference< XComponentContext >& rxCtx ) :
     mnVisiblePage( -1 ),
     mpObjects( nullptr ),
     mbExportShapeSelection(false),
+    mbIsPreview(false),
     mbWriterFilter(false),
     mbCalcFilter(false),
     mbImpressFilter(false),
@@ -102,35 +103,43 @@ sal_Bool SAL_CALL SVGFilter::filter( const Sequence< PropertyValue >& rDescripto
     if(mxDstDoc.is()) // Import works for Impress / draw only
         return filterImpressOrDraw(rDescriptor);
 
-    if(mxSrcDoc.is())
+    if(!mxSrcDoc)
+        return false;
+
+    for (const PropertyValue& rProp : rDescriptor)
+    {
+        if (rProp.Name == "IsPreview")
+        {
+            rProp.Value >>= mbIsPreview;
+            break;
+        }
+    }
+
+    for (const PropertyValue& rProp : rDescriptor)
     {
-        for (const PropertyValue& rProp : rDescriptor)
+        if (rProp.Name == "FilterName")
         {
-            if (rProp.Name == "FilterName")
+            OUString sFilterName;
+            rProp.Value >>= sFilterName;
+            if(sFilterName == "impress_svg_Export")
             {
-                OUString sFilterName;
-                rProp.Value >>= sFilterName;
-                if(sFilterName == "impress_svg_Export")
-                {
-                    mbImpressFilter = true;
-                    return filterImpressOrDraw(rDescriptor);
-                }
-                else if(sFilterName == "writer_svg_Export")
-                {
-                    mbWriterFilter = true;
-                    return filterWriterOrCalc(rDescriptor);
-                }
-                else if(sFilterName == "calc_svg_Export")
-                {
-                    mbCalcFilter = true;
-                    return filterWriterOrCalc(rDescriptor);
-                }
-                break;
+                mbImpressFilter = true;
+                return filterImpressOrDraw(rDescriptor);
             }
+            else if(sFilterName == "writer_svg_Export")
+            {
+                mbWriterFilter = true;
+                return filterWriterOrCalc(rDescriptor);
+            }
+            else if(sFilterName == "calc_svg_Export")
+            {
+                mbCalcFilter = true;
+                return filterWriterOrCalc(rDescriptor);
+            }
+            break;
         }
-        return filterImpressOrDraw(rDescriptor);
     }
-    return false;
+    return filterImpressOrDraw(rDescriptor);
 }
 
 bool SVGFilter::filterImpressOrDraw( const Sequence< PropertyValue >& rDescriptor )
diff --git a/filter/source/svg/svgfilter.hxx b/filter/source/svg/svgfilter.hxx
index eb889e81662e..93e14ec41671 100644
--- a/filter/source/svg/svgfilter.hxx
+++ b/filter/source/svg/svgfilter.hxx
@@ -209,6 +209,7 @@ private:
     Sequence< PropertyValue >           maFilterData;
     Reference< css::drawing::XDrawPage > mxDefaultPage;
     std::vector< Reference< css::drawing::XDrawPage > > mSelectedPages;
+    bool                                mbIsPreview;
 
     bool                                mbWriterFilter;
     bool                                mbCalcFilter;
diff --git a/filter/source/svg/svgwriter.cxx b/filter/source/svg/svgwriter.cxx
index 6178da0549db..d9c74d0081c3 100644
--- a/filter/source/svg/svgwriter.cxx
+++ b/filter/source/svg/svgwriter.cxx
@@ -2943,7 +2943,27 @@ void SVGActionWriter::ImplWriteBmp( const BitmapEx& rBmpEx,
         }
     }
 
-    if( !(bCached || GraphicConverter::Export( aOStm, rBmpEx, ConvertDataFormat::PNG ) == ERRCODE_NONE) )
+    const BitmapEx* pBitmap = &rBmpEx;
+    std::unique_ptr<BitmapEx> pNewBitmap;
+
+    // for preview we generate downscaled images (1280x720 max)
+    if (mbIsPreview)
+    {
+        Size aSize = rBmpEx.GetSizePixel();
+        double fX = static_cast<double>(aSize.getWidth()) / 1280;
+        double fY = static_cast<double>(aSize.getHeight()) / 720;
+        double fFactor = fX > fY ? fX : fY;
+        if (fFactor > 1.0)
+        {
+            aSize.setWidth(aSize.getWidth() / fFactor);
+            aSize.setHeight(aSize.getHeight() / fFactor);
+            pNewBitmap = std::make_unique<BitmapEx>(rBmpEx);
+            pNewBitmap->Scale(aSize);
+            pBitmap = pNewBitmap.get();
+        }
+    }
+
+    if( !(bCached || GraphicConverter::Export( aOStm, *pBitmap, ConvertDataFormat::PNG ) == ERRCODE_NONE) )
         return;
 
     Point                    aPt;
diff --git a/filter/source/svg/svgwriter.hxx b/filter/source/svg/svgwriter.hxx
index fdfcd24d32b2..d48d68bdec72 100644
--- a/filter/source/svg/svgwriter.hxx
+++ b/filter/source/svg/svgwriter.hxx
@@ -318,6 +318,7 @@ private:
     bool                                        mbClipAttrChanged;
     bool                                        mbIsPlaceholderShape;
     const MetaBitmapActionMap*                  mpEmbeddedBitmapsMap;
+    bool                                        mbIsPreview;
 
 
     tools::Long                    ImplMap( sal_Int32 nVal ) const;
@@ -377,6 +378,7 @@ public:
     void                    SetEmbeddedBitmapRefs( const MetaBitmapActionMap* pEmbeddedBitmapsMap );
     void StartMask(const Point& rDestPt, const Size& rDestSize, const Gradient& rGradient,
                    sal_uInt32 nWriteFlags, OUString* pTextStyle = nullptr);
+    void                    SetPreviewMode(bool bState = true) { mbIsPreview = bState; }
 };
 
 
diff --git a/sfx2/source/doc/objstor.cxx b/sfx2/source/doc/objstor.cxx
index 06602206cfe9..548ce34b1c21 100644
--- a/sfx2/source/doc/objstor.cxx
+++ b/sfx2/source/doc/objstor.cxx
@@ -2411,6 +2411,7 @@ bool SfxObjectShell::ExportTo( SfxMedium& rMedium )
         bool bHasBaseURL = false;
         bool bHasFilterName = false;
         bool bIsRedactMode = false;
+        bool bIsPreview = false;
         sal_Int32 nEnd = aOldArgs.getLength();
 
         for ( sal_Int32 i = 0; i < nEnd; i++ )
@@ -2428,6 +2429,13 @@ bool SfxObjectShell::ExportTo( SfxMedium& rMedium )
                 bHasFilterName = true;
         }
 
+        const css::uno::Sequence<css::beans::PropertyValue>& rMediumArgs = rMedium.GetArgs();
+        for ( sal_Int32 i = 0; i < rMediumArgs.getLength(); i++ )
+        {
+            if( rMediumArgs[i].Name == "IsPreview" )
+                rMediumArgs[i].Value >>= bIsPreview;
+        }
+
         // FIXME: Handle this inside TransformItems()
         if (pItems->GetItemState(SID_IS_REDACT_MODE) == SfxItemState::SET)
             bIsRedactMode = true;
@@ -2473,6 +2481,14 @@ bool SfxObjectShell::ExportTo( SfxMedium& rMedium )
             pArgs[nEnd-1].Value <<= bIsRedactMode;
         }
 
+        if (bIsPreview)
+        {
+            aArgs.realloc( ++nEnd );
+            auto pArgs = aArgs.getArray();
+            pArgs[nEnd-1].Name = "IsPreview";
+            pArgs[nEnd-1].Value <<= bIsPreview;
+        }
+
         return xFilter->filter( aArgs );
         }catch(...)
         {}
diff --git a/sw/inc/cmdid.h b/sw/inc/cmdid.h
index ef4e79e7225c..687f5980d81d 100644
--- a/sw/inc/cmdid.h
+++ b/sw/inc/cmdid.h
@@ -633,6 +633,7 @@
 #define FN_UNO_VISIBLE_AREA_HEIGHT          (FN_EXTRA2 + 126)
 
 #define FN_UNO_TRANSFORMED_GRAPHIC          (FN_EXTRA2 + 127)
+#define FN_UNO_GRAPHIC_PREVIEW              (FN_EXTRA2 + 128)
 
 // Area: Help
 // Region: Traveling & Selection
diff --git a/sw/inc/unoprnms.hxx b/sw/inc/unoprnms.hxx
index 7ef5d0a58cd7..5d8684c47f53 100644
--- a/sw/inc/unoprnms.hxx
+++ b/sw/inc/unoprnms.hxx
@@ -160,6 +160,7 @@
 #define UNO_NAME_FILE_LINK "FileLink"
 #define UNO_NAME_GRAPHIC "Graphic"
 #define UNO_NAME_TRANSFORMED_GRAPHIC "TransformedGraphic"
+#define UNO_NAME_GRAPHIC_PREVIEW "GraphicPreview"
 #define UNO_NAME_IS_PROTECTED "IsProtected"
 #define UNO_NAME_PARA_KEEP_TOGETHER "ParaKeepTogether"
 #define UNO_NAME_KEEP_TOGETHER "KeepTogether"
diff --git a/sw/source/core/unocore/unoframe.cxx b/sw/source/core/unocore/unoframe.cxx
index 4c35a9248665..6b21f34b25ce 100644
--- a/sw/source/core/unocore/unoframe.cxx
+++ b/sw/source/core/unocore/unoframe.cxx
@@ -2112,7 +2112,8 @@ uno::Any SwXFrame::getPropertyValue(const OUString& rPropertyName)
                 aAny <<= pGrfNode->GetGrf().GetXGraphic();
             }
         }
-        else if( FN_UNO_TRANSFORMED_GRAPHIC == pEntry->nWID )
+        else if( FN_UNO_TRANSFORMED_GRAPHIC == pEntry->nWID
+            || FN_UNO_GRAPHIC_PREVIEW == pEntry->nWID )
         {
             const SwNodeIndex* pIdx = pFormat->GetContent().GetContentIdx();
             if(pIdx)
@@ -2136,6 +2137,19 @@ uno::Any SwXFrame::getPropertyValue(const OUString& rPropertyName)
                         awt::Size aFrameSize = getSize();
                         Size aSize100thmm(aFrameSize.Width, aFrameSize.Height);
                         Size aSize = OutputDevice::LogicToLogic(aSize100thmm, MapMode(MapUnit::Map100thMM), aGraphicObj.GetPrefMapMode());
+
+                        if (FN_UNO_GRAPHIC_PREVIEW == pEntry->nWID)
+                        {
+                            double fX = static_cast<double>(aSize.getWidth()) / 1280;
+                            double fY = static_cast<double>(aSize.getHeight()) / 720;
+                            double fFactor = fX > fY ? fX : fY;
+                            if (fFactor > 1.0)
+                            {
+                                aSize.setWidth(aSize.getWidth() / fFactor);
+                                aSize.setHeight(aSize.getHeight() / fFactor);
+                            }
+                        }
+
                         Graphic aGraphic = aGraphicObj.GetTransformedGraphic(aSize, aGraphicObj.GetPrefMapMode(), aGraphicAttr);
                         aAny <<= aGraphic.GetXGraphic();
                     }
diff --git a/sw/source/core/unocore/unomap1.cxx b/sw/source/core/unocore/unomap1.cxx
index 9a186b05d280..3e2bb53faab5 100644
--- a/sw/source/core/unocore/unomap1.cxx
+++ b/sw/source/core/unocore/unomap1.cxx
@@ -818,6 +818,7 @@ const SfxItemPropertyMapEntry*  SwUnoPropertyMapProvider::GetGraphicPropertyMap(
         { u"" UNO_NAME_GRAPHIC, FN_UNO_GRAPHIC, cppu::UnoType<css::graphic::XGraphic>::get(), 0, 0 },
         { u"" UNO_NAME_GRAPHIC_URL, FN_UNO_GRAPHIC_URL, cppu::UnoType<css::uno::Any>::get(), 0, 0 },
         { u"" UNO_NAME_TRANSFORMED_GRAPHIC, FN_UNO_TRANSFORMED_GRAPHIC, cppu::UnoType<css::graphic::XGraphic>::get(), 0, 0 },
+        { u"" UNO_NAME_GRAPHIC_PREVIEW, FN_UNO_GRAPHIC_PREVIEW, cppu::UnoType<css::graphic::XGraphic>::get(), 0, 0 },
         { u"" UNO_NAME_ACTUAL_SIZE, FN_UNO_ACTUAL_SIZE,    cppu::UnoType<css::awt::Size>::get(),  PropertyAttribute::READONLY, CONVERT_TWIPS},
         { u"" UNO_NAME_CONTOUR_POLY_POLYGON, FN_PARAM_CONTOUR_PP, cppu::UnoType<css::drawing::PointSequenceSequence>::get(), PropertyAttribute::MAYBEVOID, 0 },
         { u"" UNO_NAME_IS_PIXEL_CONTOUR, FN_UNO_IS_PIXEL_CONTOUR, cppu::UnoType<bool>::get(), PROPERTY_NONE, 0 },