loplugin:ostr in cppcanvas

Change-Id: I59c10b0d82297157a87cb366be69c8e757638c20
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/167257
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

cppcanvas/qa/extras/emfplus/emfplus.cxx

@@ -22,7 +22,7 @@ class Test : public UnoApiTest
 {
 public:
     Test()
-        : UnoApiTest("/cppcanvas/qa/extras/emfplus/data/")
+        : UnoApiTest(u"/cppcanvas/qa/extras/emfplus/data/"_ustr)
     {
     }
 

cppcanvas/source/mtfrenderer/implrenderer.cxx

@@ -830,7 +830,7 @@ namespace cppcanvas::internal
             if (rFont.GetEmphasisMark() != FontEmphasisMark::NONE)
             {
                 uno::Sequence< beans::PropertyValue > aProperties{ comphelper::makePropertyValue(
-                    "EmphasisMark", sal_uInt32(rFont.GetEmphasisMark())) };
+                    u"EmphasisMark"_ustr, sal_uInt32(rFont.GetEmphasisMark())) };
                 return rParms.mrCanvas->getUNOCanvas()->createFont(aFontRequest,
                                                                 aProperties,
                                                                 aFontMatrix);

cppcanvas/source/mtfrenderer/mtftools.cxx

@@ -70,7 +70,7 @@ namespace cppcanvas::tools
 
                 default:
                     throw css::uno::RuntimeException(
-                                      "tools::getBaselineOffset(): Unexpected TextAlign value" );
+                                      u"tools::getBaselineOffset(): Unexpected TextAlign value"_ustr );
             }
         }