Fix fdo#59970 slowless of about box rendering

Prevent creation of transparent bitmap at arbitrary scale, and
subsequent scaling down. For remote X, that even has to fetch
pixel back from remote side for manual scaling.

Change-Id: I58e011231f2b81b913a6b02dd973385ef5664379
Signed-off-by: Petr Mladek <pmladek@suse.cz>

cui/Library_cui.mk

@@ -50,6 +50,7 @@ $(eval $(call gb_Library_use_libraries,cui,\
     comphelper \
     cppu \
     cppuhelper \
+    drawinglayer \
     editeng \
     i18nisolang1 \
     jvmfwk \

cui/source/dialogs/about.cxx

@@ -20,6 +20,7 @@
 #include <vcl/svapp.hxx>
 #include <vcl/msgbox.hxx>
 
+#include <osl/process.h>
 #include <tools/stream.hxx>
 #include <rtl/bootstrap.hxx>
 #include <unotools/configmgr.hxx>
@@ -35,6 +36,13 @@
 #include "comphelper/anytostring.hxx"
 #include "cppuhelper/exc_hlp.hxx"
 #include "cppuhelper/bootstrap.hxx"
+#include <com/sun/star/graphic/XPrimitive2DRenderer.hpp>
+#include <basegfx/numeric/ftools.hxx>
+#include <vcl/canvastools.hxx>
+#include <com/sun/star/geometry/RealRectangle2D.hpp>
+#include <com/sun/star/rendering/XIntegerReadOnlyBitmap.hpp>
+#include <basegfx/matrix/b2dhommatrixtools.hxx>
+#include <drawinglayer/primitive2d/transformprimitive2d.hxx>
 
 #include <sfx2/sfxuno.hxx>
 #include <sfx2/sfxcommands.h>
@@ -183,6 +191,91 @@ void AboutDialog::StyleControls()
     aCancelButton.GrabFocus();
 }
 
+static bool loadBrandSvg(const char *pName, BitmapEx &rBitmap, int nWidth )
+{
+    // Load from disk
+    // ---------------------------------------------------------------------
+    rtl::OUString aBaseName = ( rtl::OUString("/") +
+                                rtl::OUString::createFromAscii( pName ) );
+    rtl::OUString aSvg( ".svg" );
+
+    rtl_Locale *pLoc = NULL;
+    osl_getProcessLocale (&pLoc);
+    LanguageTag aLanguageTag( *pLoc);
+
+    rtl::OUString aName = aBaseName + aSvg;
+    rtl::OUString aLocaleName = ( aBaseName + rtl::OUString("-") +
+                                  aLanguageTag.getBcp47() +
+                                  aSvg );
+    rtl::OUString uri = rtl::OUString::createFromAscii( "$BRAND_BASE_DIR/program" ) + aBaseName+aSvg;
+    rtl::Bootstrap::expandMacros( uri );
+    INetURLObject aObj( uri );
+    SvgData aSvgData(aObj.PathToFileName());
+
+    // transform into [0,0,width,width*aspect] std dimensions
+    // ---------------------------------------------------------------------
+    basegfx::B2DRange aRange(aSvgData.getRange());
+    const double fAspectRatio(aRange.getWidth()/aRange.getHeight());
+    basegfx::B2DHomMatrix aTransform(
+        basegfx::tools::createTranslateB2DHomMatrix(
+            -aRange.getMinX(),
+            -aRange.getMinY()));
+    aTransform.scale(
+        nWidth / aRange.getWidth(),
+        nWidth / fAspectRatio / aRange.getHeight());
+    const drawinglayer::primitive2d::Primitive2DReference xTransformRef(
+        new drawinglayer::primitive2d::TransformPrimitive2D(
+            aTransform,
+            aSvgData.getPrimitive2DSequence()));
+
+    // UNO dance to render from drawinglayer
+    // ---------------------------------------------------------------------
+    uno::Reference< lang::XMultiServiceFactory > xFactory(::comphelper::getProcessServiceFactory());
+    const rtl::OUString aServiceName("com.sun.star.graphic.Primitive2DTools");
+
+    try
+    {
+        const uno::Reference< graphic::XPrimitive2DRenderer > xPrimitive2DRenderer(
+            xFactory->createInstance(aServiceName),
+            uno::UNO_QUERY_THROW);
+
+        if(xPrimitive2DRenderer.is())
+        {
+            // cancel out rasterize's mm2pixel conversion
+            const double fFakeDPI=1000.0/2.54;
+
+            geometry::RealRectangle2D aRealRect(
+                0, 0,
+                nWidth, nWidth / fAspectRatio);
+
+            const uno::Reference< rendering::XBitmap > xBitmap(
+                xPrimitive2DRenderer->rasterize(
+                    drawinglayer::primitive2d::Primitive2DSequence(&xTransformRef, 1),
+                    uno::Sequence< beans::PropertyValue >(),
+                    fFakeDPI,
+                    fFakeDPI,
+                    aRealRect,
+                    500000));
+
+            if(xBitmap.is())
+            {
+                const uno::Reference< rendering::XIntegerReadOnlyBitmap> xIntBmp(xBitmap, uno::UNO_QUERY_THROW);
+
+                if(xIntBmp.is())
+                {
+                    rBitmap = vcl::unotools::bitmapExFromXBitmap(xIntBmp);
+                    return true;
+                }
+            }
+        }
+    }
+    catch(const uno::Exception&)
+    {
+        OSL_ENSURE(sal_False, "Got no graphic::XPrimitive2DRenderer (!)" );
+    }
+    return false;
+}
+
 void AboutDialog::LayoutControls()
 {
     // Get the size of the screen
@@ -207,13 +300,13 @@ void AboutDialog::LayoutControls()
     Size aLogoSize( aIdealTextWidth, aIdealTextWidth / 20 );
     Point aLogoPos( 0, 0 );
 
-    if( Application::LoadBrandSVG("flat_logo", aLogoBitmap) &&
+    // load svg logo, specify desired width, scale height isotrophically
+    if( loadBrandSvg("flat_logo",
+                     aLogoBitmap,
+                     aDialogSize.Width()) &&
         !aLogoBitmap.IsEmpty() )
     {
-        const float aLogoWidthHeightRatio = (float)aLogoBitmap.GetSizePixel().Width() / (float)aLogoBitmap.GetSizePixel().Height();
-        aLogoSize.Width() = aDialogSize.Width() ;
-        aLogoSize.Height() = aLogoSize.Width() / aLogoWidthHeightRatio ;
-        aLogoBitmap.Scale(aLogoSize);
+        aLogoSize = aLogoBitmap.GetSizePixel();
 
         aLogoImage.SetImage( Image( aLogoBitmap ) );
         aLogoImage.SetPosSizePixel( aLogoPos, aLogoSize );
@@ -274,22 +367,10 @@ void AboutDialog::LayoutControls()
 
 
     // Layout background image
-    if ( !(Application::GetSettings().GetStyleSettings().GetHighContrastMode()) &&
-          Application::LoadBrandSVG("shell/about", aBackgroundBitmap) &&
-          !aBackgroundBitmap.IsEmpty() )
-    {
-        const float aBackgroundWidthHeightRatio = (float)aBackgroundBitmap.GetSizePixel().Width() /
-            (float)aBackgroundBitmap.GetSizePixel().Height();
-        Size aBackgroundSize (aDialogSize.Width(), aDialogSize.Width() / aBackgroundWidthHeightRatio );
-
-        if ( aBackgroundSize.Height() < aDialogSize.Height())
-        {
-            aBackgroundSize.Width() = aDialogSize.Height() * aBackgroundWidthHeightRatio ;
-            aBackgroundSize.Height() = aDialogSize.Height();
-        }
-        aBackgroundBitmap.Scale(aBackgroundSize);
-    }
-
+    if ( !(Application::GetSettings().GetStyleSettings().GetHighContrastMode()) )
+        loadBrandSvg("shell/about",
+                     aBackgroundBitmap,
+                     aDialogSize.Width());
     SetOutputSizePixel( aDialogSize );
 
 }