tdf#118860 svx opengl: avoid SalBitmap creation without solar mutex

The bugdoc has 2 slides. When switching to the second slide, the graphic
is loaded in the background, but OpenGLSalBitmap::Create() can't work
correctly if the caller doesn't own the solar mutex.

This already asserts in OpenGLContext::prepareForYield() in a less
obvious way.

Focus on the correctness, so just hold the solar mutex during the whole
ImportGrpahic() call. If it turns out that the purpose of running this
on a thread is to avoid synchronous network traffic, then the data could
be first copied to a memory stream, and only then take the lock + import
the graphic.

(cherry picked from commit 919ccaba)

Change-Id: I88203c12b4e7a5f2b689928c01e2ba953c5b13c5
Reviewed-on: https://gerrit.libreoffice.org/58126
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
(cherry picked from commit 2038ab9d)

svx/source/svdraw/svdograf.cxx

@@ -94,6 +94,9 @@ const Graphic ImpLoadLinkedGraphic( const OUString& aFileName, const OUString& a
         aFilterData[ 0 ].Name = "CreateNativeLink";
         aFilterData[ 0 ].Value <<= true;
 
+        // Need to own the solar mutex while creating a SalBitmap.
+        SolarMutexGuard aGuard;
+
         // #i123042# for e.g SVG the path is needed, so hand it over here. I have no real idea
         // what consequences this may have; maybe this is not handed over by purpose here. Not
         // handing it over means that any GraphicFormat that internally needs a path as base

vcl/opengl/salbmp.cxx

@@ -117,6 +117,7 @@ OpenGLSalBitmap::~OpenGLSalBitmap()
 
 bool OpenGLSalBitmap::Create( const OpenGLTexture& rTex, long nX, long nY, long nWidth, long nHeight )
 {
+    DBG_TESTSOLARMUTEX();
     static const BitmapPalette aEmptyPalette;
     OpenGLVCLContextZone aContextZone;
 
@@ -160,6 +161,7 @@ bool OpenGLSalBitmap::Create( const OpenGLTexture& rTex, long nX, long nY, long
 
 bool OpenGLSalBitmap::Create( const Size& rSize, sal_uInt16 nBits, const BitmapPalette& rBitmapPalette )
 {
+    DBG_TESTSOLARMUTEX();
     OpenGLVCLContextZone aContextZone;
 
     Destroy();
@@ -185,16 +187,19 @@ bool OpenGLSalBitmap::Create( const Size& rSize, sal_uInt16 nBits, const BitmapP
 
 bool OpenGLSalBitmap::Create( const SalBitmap& rSalBmp )
 {
+    DBG_TESTSOLARMUTEX();
     return Create( rSalBmp, rSalBmp.GetBitCount() );
 }
 
 bool OpenGLSalBitmap::Create( const SalBitmap& rSalBmp, SalGraphics* pGraphics )
 {
+    DBG_TESTSOLARMUTEX();
     return Create( rSalBmp, pGraphics ? pGraphics->GetBitCount() : rSalBmp.GetBitCount() );
 }
 
 bool OpenGLSalBitmap::Create( const SalBitmap& rSalBmp, sal_uInt16 nNewBitCount )
 {
+    DBG_TESTSOLARMUTEX();
     OpenGLZone aZone;
 
     // check that carefully only in the debug mode
@@ -233,6 +238,7 @@ bool OpenGLSalBitmap::Create( const SalBitmap& rSalBmp, sal_uInt16 nNewBitCount
 
 bool OpenGLSalBitmap::Create( const css::uno::Reference< css::rendering::XBitmapCanvas >& /*xBitmapCanvas*/, Size& /*rSize*/, bool /*bMask*/ )
 {
+    DBG_TESTSOLARMUTEX();
     // TODO Is this method needed?
     return false;
 }