LOK: renderFont method

Renders the given font in a virtual output device. For now it iterates
over a list of fonts until it finds the one that matches the requested
font.

Change-Id: Ie4ecc3a1441519840d8f4f4a890e92670759b4fc

desktop/source/lib/init.cxx

@@ -373,6 +373,10 @@ static void doc_destroyView(LibreOfficeKitDocument* pThis, int nId);
 static void doc_setView(LibreOfficeKitDocument* pThis, int nId);
 static int doc_getView(LibreOfficeKitDocument* pThis);
 static int doc_getViews(LibreOfficeKitDocument* pThis);
+static unsigned char* doc_renderFont(LibreOfficeKitDocument* pThis,
+                          const char *pFontName,
+                          int* pFontWidth,
+                          int* pFontHeight);
 
 LibLODocument_Impl::LibLODocument_Impl(const uno::Reference <css::lang::XComponent> &xComponent)
     : mxComponent(xComponent)
@@ -394,6 +398,7 @@ LibLODocument_Impl::LibLODocument_Impl(const uno::Reference <css::lang::XCompone
         m_pDocumentClass->setPart = doc_setPart;
         m_pDocumentClass->getPartName = doc_getPartName;
         m_pDocumentClass->setPartMode = doc_setPartMode;
+        m_pDocumentClass->renderFont = doc_renderFont;
         m_pDocumentClass->paintTile = doc_paintTile;
         m_pDocumentClass->getTileMode = doc_getTileMode;
         m_pDocumentClass->getDocumentSize = doc_getDocumentSize;
@@ -1543,6 +1548,54 @@ static int doc_getViews(LibreOfficeKitDocument* /*pThis*/)
     return SfxLokHelper::getViews();
 }
 
+unsigned char* doc_renderFont(LibreOfficeKitDocument* /*pThis*/,
+                    const char* pFontName,
+                    int* pFontWidth,
+                    int* pFontHeight)
+{
+    OString aSearchedFontName(pFontName);
+    SfxObjectShell* pDocSh = SfxObjectShell::Current();
+    const SvxFontListItem* pFonts = static_cast<const SvxFontListItem*>(
+        pDocSh->GetItem(SID_ATTR_CHAR_FONTLIST));
+    const FontList* pList = pFonts ? pFonts->GetFontList() : nullptr;
+
+    if ( pList )
+    {
+        sal_uInt16 nFontCount = pList->GetFontNameCount();
+        for (sal_uInt16 i = 0; i < nFontCount; ++i)
+        {
+            const vcl::FontInfo& rInfo = pList->GetFontName(i);
+            OUString aFontName = rInfo.GetName();
+            if (!aSearchedFontName.equals(aFontName.toUtf8().getStr()))
+                continue;
+
+            VirtualDevice aDevice(nullptr, Size(1, 1), DeviceFormat::DEFAULT);
+            ::Rectangle aRect;
+            vcl::Font aFont(rInfo);
+            aFont.SetSize(Size(0, 25));
+            aDevice.SetFont(aFont);
+            aDevice.GetTextBoundRect(aRect, aFontName);
+            int nFontWidth = aRect.BottomRight().X() + 1;
+            *pFontWidth = nFontWidth;
+            int nFontHeight = aRect.BottomRight().Y() + 1;
+            *pFontHeight = nFontHeight;
+
+            unsigned char* pBuffer = static_cast<unsigned char*>(malloc(4 * nFontWidth * nFontHeight));
+            memset(pBuffer, 0, nFontWidth * nFontHeight * 4);
+            boost::shared_array<sal_uInt8> aBuffer(pBuffer, NoDelete< sal_uInt8 >());
+
+            aDevice.SetBackground(Wallpaper(COL_TRANSPARENT));
+            aDevice.SetOutputSizePixelScaleOffsetAndBuffer(
+                        Size(nFontWidth, nFontHeight), Fraction(1.0), Point(),
+                        aBuffer, nullptr);
+            aDevice.DrawText(Point(0,0), aFontName);
+
+            return pBuffer;
+        }
+    }
+    return nullptr;
+}
+
 static char* lo_getError (LibreOfficeKit *pThis)
 {
     LibLibreOffice_Impl* pLib = static_cast<LibLibreOffice_Impl*>(pThis);

include/LibreOfficeKit/LibreOfficeKit.h

@@ -202,6 +202,12 @@ struct _LibreOfficeKitDocumentClass
     int (*getView) (LibreOfficeKitDocument* pThis);
     /// @see lok::Document::getViews().
     int (*getViews) (LibreOfficeKitDocument* pThis);
+
+    /// @see lok::Document::renderFont().
+    unsigned char* (*renderFont) (LibreOfficeKitDocument* pThis,
+                       const char* pFontName,
+                       int* pFontWidth,
+                       int* pFontHeight);
 #endif // LOK_USE_UNSTABLE_API
 };
 

include/LibreOfficeKit/LibreOfficeKit.hxx

@@ -373,6 +373,18 @@ public:
     {
         return mpDoc->pClass->getViews(mpDoc);
     }
+
+    /**
+     * Paints a font name to be displayed in the font list
+     * @param pFontName the font to be painted
+     */
+    inline unsigned char* renderFont(const char *pFontName,
+                          int *pFontWidth,
+                          int *pFontHeight)
+    {
+        return mpDoc->pClass->renderFont(mpDoc, pFontName, pFontWidth, pFontHeight);
+    }
+
 #endif // LOK_USE_UNSTABLE_API
 };